Method and apparatus for frequency domain resource allocation in a wireless communication system

文档序号：1943059 发布日期：2021-12-07 浏览：6次中文

阅读说明：本技术 无线通信系统中频域资源分配的方法和装置 (Method and apparatus for frequency domain resource allocation in a wireless communication system ) 是由吴振荣方钟絃柳贤锡朴成珍申哲圭吕贞镐于 2020-03-30 设计创作，主要内容包括：本公开涉及通信方法和系统,用于将用于支持超第四代(4G)系统的更高数据速率的第5代(5G)通信系统与用于物联网(IoT)的技术融合。本公开可应用于基于5G通信技术和IoT相关技术的智能服务,诸如智能家庭、智能建筑、智能城市、智能汽车、互连汽车、保健、数字教育、智能零售、保安和安全服务。提供了由通信系统中的终端执行的方法。该方法包括：从基站接收物理上行链路控制信道的配置信息,该配置信息包括交织资源的索引；基于配置信息标识两个交织资源；以及使用两个交织资源中的至少一个在物理上行链路控制信道上向基站发送上行链路控制信息,其中交织资源由多个资源块组成,多个资源块之间的间隔相同。(The present disclosure relates to communication methods and systems for fusing a 5 th generation (5G) communication system for supporting higher data rates than a fourth generation (4G) system with technologies for internet of things (IoT). The present disclosure is applicable to smart services based on 5G communication technologies and IoT related technologies, such as smart homes, smart buildings, smart cities, smart cars, interconnected cars, healthcare, digital education, smart retail, security, and security services. A method performed by a terminal in a communication system is provided. The method comprises the following steps: receiving configuration information of a physical uplink control channel from a base station, the configuration information including an index of an interleaving resource; identifying two interleaving resources based on the configuration information; and transmitting uplink control information to the base station on a physical uplink control channel using at least one of two interleaved resources, wherein the interleaved resources are composed of a plurality of resource blocks, and intervals between the plurality of resource blocks are the same.)

1. A method performed by a terminal in a communication system, the method comprising:

receiving configuration information of a physical uplink control channel from a base station, the configuration information including an index of an interleaving resource;

identifying two interleaving resources based on the configuration information; and

transmitting uplink control information to the base station on the physical uplink control channel using at least one of the two interleaved resources,

wherein the interleaving resource is composed of a plurality of resource blocks, and intervals among the plurality of resource blocks are the same.

2. The method of claim 1, wherein a first interleaving resource and a second interleaving resource are identified based on the configuration information, and

wherein the index of the second resource is derived based on the index of the first interleaved resource and an offset that is one of predetermined integers.

3. The method of claim 1, further comprising:

determining at least one of the two interleaving resources based on whether a code rate of the uplink control information is equal to or greater than a code rate determined for transmission of the uplink control information.

4. The method of claim 3, wherein a code rate of the uplink control information is equal to or greater than a code rate determined for transmission of the uplink control information, the first interleaving resource is determined for transmission of the uplink control information, and

wherein the two interleaving resources are determined for transmission of the uplink control information if a code rate of the uplink control information is less than a code rate determined for transmission of the uplink control information.

5. A method performed by a base station in a communication system, the method comprising:

identifying two interleaving resources for receiving uplink control information;

sending configuration information of a physical uplink control channel to a terminal, wherein the configuration information comprises indexes of interleaving resources according to the two interleaving resources; and

receiving the uplink control information from the terminal on the physical uplink control channel using at least one of the two interleaved resources,

the interleaving resource is composed of a plurality of resource blocks, and intervals among the resource blocks are the same.

6. The method of claim 5, wherein the index of the second resource is derived based on the index of the first interleaved resource and an offset that is one of predetermined integers.

7. The method of claim 5, further comprising:

8. The method of claim 7, wherein the first and second light sources are selected from the group consisting of,

wherein a code rate of the uplink control information is equal to or greater than a code rate determined for transmission of the uplink control information, the first interleaving resource is determined for transmission of the uplink control information, and

9. A terminal in a communication system, the terminal comprising:

a transceiver; and

a controller coupled with the transceiver and configured to:

receiving configuration information of a physical uplink control channel from a base station, the configuration information including an index of an interleaving resource,

identifying two interleaved resources based on the configuration information, an

Transmitting uplink control information to the base station on the physical uplink control channel using at least one of the two interleaved resources,

the interleaving resource is composed of a plurality of resource blocks, and intervals among the resource blocks are the same.

10. The terminal of claim 9, wherein a first interleaving resource and a second interleaving resource are identified based on the configuration information, and

wherein the index of the second resource is derived based on the index of the first interleaved resource and an offset that is one of predetermined integers.

11. The terminal of claim 9, wherein the controller is further configured to:

12. The terminal according to claim 11, wherein,

13. A base station in a communication system, the base station comprising:

a transceiver; and

a controller coupled with the transceiver and configured to:

two interleaving resources for receiving uplink control information are identified,

receiving the uplink control information from the terminal on the physical uplink control channel using at least one of the two interleaved resources,

the interleaving resource is composed of a plurality of resource blocks, and intervals among the resource blocks are the same.

14. The base station of claim 13, wherein the index of the second resource is derived based on the index of the first interleaved resource and an offset that is one of predetermined integers.

15. The base station of claim 13, wherein the controller is further configured to:

Technical Field

The present disclosure relates to wireless communication systems. More particularly, the present disclosure relates to a method and apparatus for frequency domain resource allocation in a wireless communication system.

Background

In order to meet the increasing demand for wireless data services since the deployment of fourth generation (4G) communication systems, efforts have been made to develop improved fifth generation (5G) or pre-5G communication systems. Accordingly, the 5G or pre-5G communication system is also referred to as an "ultra 4G network" or a "Long Term Evolution (LTE) system". 5G communication systems are known to be implemented in the higher frequency band (mmWave), for example in the 60GHz band, to achieve higher data rates. In order to reduce propagation loss of radio waves and increase transmission distance, beamforming, massive Multiple Input Multiple Output (MIMO), full-dimensional MIMO (FD-MIMO), array antenna, analog beamforming, massive antenna technology are discussed in the 5G communication system. Further, in the 5G communication system, development of system network improvement is underway based on advanced small cells, cloud Radio Access Network (RAN), ultra dense network, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, coordinated multipoint (CoMP), receiver-side interference cancellation, and the like. In 5G systems, hybrid Frequency Shift Keying (FSK) and Quadrature Amplitude Modulation (QAM) modulation (FQAM) and Sliding Window Superposition Coding (SWSC) have been developed as Advanced Coding Modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and Sparse Code Multiple Access (SCMA) have been developed as advanced access techniques.

The internet, a human-centric connectivity network where humans generate and consume information, is now evolving into the internet of things (IoT) where distributed entities, such as items, exchange and process information without human intervention. Internet of everything (IoE) has emerged as a combination of IoT technology and big data processing technology through a connection with a cloud server. As technical elements such as "sensing technology", "wired/wireless communication and network infrastructure", "service interface technology", and "security technology" have been required for IoT implementations, sensor networks, machine-to-machine (M2M) communication, Machine Type Communication (MTC), etc. have recently been studied. Such an IoT environment may provide an intelligent internet technology service that creates new value to human life by collecting and analyzing data generated between connected items. IoT may be applied in various fields including smart homes, smart buildings, smart cities, smart cars or interconnected cars, smart grids, healthcare, smart instruments and advanced medical services through aggregation and combination between existing Information Technology (IT) and various industrial applications.

In line with this, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as sensor networks, Machine Type Communication (MTC), and machine-to-machine (M2M) communication may be implemented through beamforming, MIMO, and array antennas. An application of a cloud Radio Access Network (RAN), which is the above-described big data processing technology, can also be considered as an example of aggregation between 5G technology and IoT technology.

In addition, a Licensed Assisted Access (LAA) technology has been studied using an unlicensed band based on a 5G communication system.

The above information is presented merely as background information to facilitate an understanding of the present disclosure. No determination is made and no assertion is made as to whether any of the above can be used as prior art with respect to the present disclosure.

Disclosure of Invention

Aspects of the present disclosure are to address at least the above problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the present disclosure is to provide a method and apparatus for frequency domain resource allocation in a wireless communication system.

Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments.

According to an aspect of the present disclosure, there is provided a method performed by a terminal in a communication system. The method includes receiving configuration information of a physical uplink control channel from a base station, the configuration information including an index of interleaved resources, identifying two interleaved resources based on the configuration information; and transmitting uplink control information to the base station on a physical uplink control channel using at least one of two interleaved resources, wherein the interleaved resources are composed of a plurality of resource blocks, and intervals between the plurality of resource blocks are the same.

According to another aspect of the present disclosure, a method performed by a base station in a communication system is provided. The method includes identifying two interleaved resources for receiving uplink control information, and transmitting configuration information of a physical uplink control channel to a terminal, the configuration information including receiving the uplink control information from the terminal on the physical uplink control channel using at least one of the two interleaved resources according to indexes of the interleaved resources of the two interleaved resources, wherein the interleaved resources are composed of a plurality of resource blocks, and intervals between the plurality of resource blocks are the same.

According to another aspect of the present disclosure, there is provided a terminal in a communication system, the terminal comprising a transceiver and a controller coupled to the transceiver and configured to: the method includes receiving configuration information of a physical uplink control channel from a base station, the configuration information including an index of an interleaved resource, identifying two interleaved resources based on the configuration information, and transmitting the uplink control information to the base station on the physical uplink control channel using at least one of the two interleaved resources, wherein the interleaved resource is composed of a plurality of resource blocks, and intervals between the plurality of resource blocks are the same.

According to another aspect of the present disclosure, there is provided a base station in a communication system, the base station comprising a transceiver and a controller coupled to the transceiver and configured to: the method includes identifying two interleaved resources for receiving uplink control information, transmitting configuration information of a physical uplink control channel to a terminal, the configuration information including an index of the interleaved resources according to the two interleaved resources, and receiving the uplink control information from the terminal on the physical uplink control channel using at least one of the two interleaved resources, wherein the interleaved resources are composed of a plurality of resource blocks, and intervals between the plurality of resource blocks are the same.

Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure.

According to the apparatuses and methods of various embodiments of the present disclosure, a method performed by a terminal for allocating frequency domain resources of an uplink signal or channel transmitted through an unlicensed frequency band is provided, so that a base station and the terminal can efficiently perform communication.

Effects that can be obtained in the present disclosure are not limited to the above-described effects, and other effects not mentioned can be clearly understood from the following description by a person having ordinary skill in the art to which the present disclosure pertains.

Drawings

The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description when taken in conjunction with the accompanying drawings, in which:

fig. 1 is a diagram illustrating a wireless communication system according to an embodiment of the present disclosure;

fig. 2 is a diagram illustrating a configuration of a base station in a wireless communication system according to an embodiment of the present disclosure;

fig. 3 is a diagram illustrating a configuration of a terminal in a wireless communication system according to an embodiment of the present disclosure;

fig. 4 is a diagram illustrating a configuration of a communication unit in a wireless communication system according to an embodiment of the present disclosure;

fig. 5 is a diagram illustrating an example of a radio resource region in a wireless communication system according to an embodiment of the present disclosure;

fig. 6 is a diagram illustrating an example of a channel access procedure in an unlicensed band in a wireless communication system according to an embodiment of the present disclosure;

fig. 7 is a diagram illustrating another example of a channel access procedure in an unlicensed band in a wireless communication system according to an embodiment of the present disclosure;

fig. 8 is a diagram illustrating an example of scheduling and feedback in a wireless communication system according to an embodiment of the present disclosure;

fig. 9A is a diagram illustrating an example of a channel occupancy time and slot format in a wireless communication system according to an embodiment of the present disclosure;

fig. 9B is a diagram explaining a method of allocating frequency resources in a wireless communication system according to an embodiment of the present disclosure;

fig. 9C is a diagram explaining another method of allocating frequency domain resources in a wireless communication system according to an embodiment of the present disclosure;

fig. 10 is a flowchart of a method for a base station to determine allocation of frequency domain resources in a wireless communication system according to an embodiment of the present disclosure;

fig. 11 is a flowchart of a method for a terminal to determine allocation of frequency domain resources in a wireless communication system according to an embodiment of the present disclosure; and

fig. 12 is another flowchart of a method for a terminal to determine allocation of frequency domain resources in a wireless communication system according to an embodiment of the present disclosure.

Throughout the drawings, it should be noted that like reference numerals are used to depict the same or similar elements, features and structures.

Detailed Description

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In describing the present disclosure, if it is determined that the related known function or configuration obscures the present disclosure in unnecessary detail, a detailed description thereof will be omitted. Further, terms described later are terms defined in consideration of their functions in the present disclosure, but may be different depending on the intention or custom of a user or operator. Accordingly, they should be defined based on the contents of the entire description of the present disclosure.

The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the disclosure as defined by the claims and their equivalents. It includes various specific details to aid understanding, but these details are to be regarded as exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are not limited to the written meaning, but are used only by the inventor to enable a clear and consistent understanding of the disclosure. Accordingly, it will be apparent to those skilled in the art that the following descriptions of the various embodiments of the present disclosure are provided for illustration only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents.

It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

In explaining the embodiments, explanations of technical contents that are well known in the art to which the present disclosure pertains and that have no direct relation to the present disclosure will be omitted. This is for the purpose of more clearly conveying the subject matter of the present disclosure, and does not obscure the subject matter of the present disclosure by omitting unnecessary description.

In the same way, in the drawings, the size and relative size of some constituent elements may be exaggerated, omitted, or briefly described. Further, the sizes of the respective constituent elements do not completely reflect the actual sizes thereof. In the drawings, like reference numerals are used for like and corresponding elements in the various drawings.

Aspects and features of the present disclosure and methods for accomplishing the same will become apparent by reference to the embodiments that will be described in detail with reference to the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, and it may be implemented in various forms. The matters defined in the description, such as detailed construction and elements, are nothing but specific details provided to assist those of ordinary skill in the art in a comprehensive understanding of the disclosure, and the disclosure is limited only by the scope of the appended claims. Throughout the description of the present disclosure, the same reference numerals are used for the same elements in the various figures.

In this case, it will be understood that each block of the flowchart illustrations, and combinations of blocks in the flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block or blocks. These computer program instructions may also be stored in a computer usable or computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer usable or computer-readable memory produce an article of manufacture including instruction means that implement the function specified in the flowchart block or blocks. The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operations to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide operations for implementing the functions specified in the flowchart block or blocks.

Moreover, each block of the flowchart illustrations may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the blocks may occur out of the order. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.

In this case, the term "cell" as used in the embodiments means, but is not limited to, a software or hardware component, such as a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), which performs certain tasks. However, "unit" is not meant to be limited to software or hardware. The term "cell" may advantageously be configured to reside on an addressable storage medium and configured to execute on one or more processors. Thus, a unit may include, by way of example, components such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functionality provided in the components and the "cells" may be combined into fewer components and "cells" or further separated into additional components and "cells". Further, components and "units" may be implemented to operate one or more Central Processing Units (CPUs) in a device or secure multimedia card. Further, in one embodiment, a "unit" may include one or more processors.

A wireless communication system was originally developed to provide voice-oriented services, but it has been extended to, for example, a broadband wireless communication system that provides high-speed and high-quality packet data services and communication standards such as third generation partnership project (3GPP) high-speed packet access (HSPA), Long Term Evolution (LTE) or evolved universal terrestrial radio access (E-UTRA), LTE advanced (LTE-a), 3GPP2 High Rate Packet Data (HRPD), Ultra Mobile Broadband (UMB), and Institute of Electrical and Electronics Engineers (IEEE) 802.16E. Furthermore, for 5 th generation wireless communication systems, 5G or New Radio (NR) communication standards have been developed.

In the case of a 5G communication system, various techniques, such as retransmission in units of Code Block Groups (CBGs) to provide various services and support high data rates, and a technique capable of transmitting an uplink signal without uplink scheduling information (e.g., unlicensed uplink transmission), will be introduced. Therefore, in the case of performing 5G communication through an unlicensed band, it is necessary to consider a more efficient channel access procedure of various variables.

In a wireless communication system including a 5 th generation (5G) communication system, at least one of enhanced mobile broadband (eMBB), large-scale machine type communication (mtc), ultra-reliable low-delay communication (URLL) may be provided to a terminal. The above-described services may be provided to the same terminal during the same period. In one embodiment, the eMBB may be a service intended for high-speed transmission of large-capacity data, the mtc may be a service intended for minimizing terminal power and accessing a plurality of terminals, and the URLLC may be a service intended for high reliability and low delay, but the above-described services are not limited thereto. These three services may be important scenarios in LTE systems or post-LTE 5G/NR (new radio or next generation radio) systems, but these services are not limited to the above examples. Further, the above-described services of the 5G system are exemplary, and the possible services of the 5G system are not limited to the above-described examples. In addition, a system providing a URLLC service may be referred to as a URLLC system, and a system providing an eMBB service may be referred to as an eMBB system. Furthermore, the terms "service" and "system" may be used interchangeably or in mixtures.

Hereinafter, the base station is a subject performing resource allocation to the terminal, and it may include at least one of an eNodeB, a NodeB, a Base Station (BS), a radio access unit, a base station controller, and a node on the network. The terminal may include at least one of a User Equipment (UE), a Mobile Station (MS), a cellular phone, a smart phone, a computer, and a multimedia system capable of performing a communication function. In the present disclosure, a Downlink (DL) is a radio transmission path of a signal transmitted from a base station to a terminal, and an Uplink (UL) is a radio transmission path of a signal transmitted from a terminal to a base station. Hereinafter, although an LTE or LTE-a system is taken as an example in the embodiment of the present disclosure, in order to explain the method and apparatus proposed in the present disclosure, the terms "physical channel" and "signal" in the LTE or LTE-a system in the related art may be used. Embodiments of the present disclosure may also be applied to other communication systems having a technical background or channel type similar to that of the mobile communication system described in the present disclosure. For example, a fifth generation (5G) mobile communication technology (5G, new radio and NR) may be included therein. Further, the embodiments of the present invention may be applied to other communication systems with partial modification within the scope not largely departing from the scope of the present disclosure, as judged by those skilled in the art.

In a 5G system or a New Radio (NR) system, which is a representative example of a broadband wireless communication system, a Downlink (DL) employs an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and an Uplink (UL) employs all schemes of OFDM, single carrier frequency division multiple access (SC-FDMA), and DFT-spread OFDM (DFT-s-OFDM). According to the multiple access scheme, data or control information of corresponding users can be distinguished from each other by allocating and operating time-frequency domain resources for transmitting the data or control information, so as to avoid overlapping of the time-frequency resources, i.e., to establish orthogonality between the time-frequency resources.

The NR system employs a hybrid automatic repeat request (HARQ) scheme in which a physical layer retransmits data if a decoding failure occurs during initial transmission of the corresponding data. According to the HARQ scheme, if a receiver does not accurately decode data, the receiver may enable a transmitter to retransmit corresponding data on a physical layer by transmitting information (e.g., Negative Acknowledgement (NACK)) for informing the transmitter of decoding failure. The receiver may combine the data retransmitted by the transmitter with the data that failed to be decoded previously to improve data reception performance. Further, according to the HARQ scheme, if the receiver has accurately decoded data, the receiver may transmit information (e.g., Acknowledgement (ACK)) for informing the transmitter of the successful decoding, so that the transmitter transmits new data.

In the following description, terms designating signals, channels, control information, network entities, and constituent elements of devices are illustrated for convenience of explanation. Accordingly, the present disclosure is not limited to the terms described later, but other terms having equivalent technical meanings may be used.

Although the various embodiments of the present disclosure will be described using terms used in some communication standards, such as the third generation partnership project (3GPP), they are for exemplary explanation only and the various embodiments of the present disclosure may be easily modified and applied to other communication systems.

Although various embodiments of the present invention are described based on an NR system, the contents of the present invention are not limited to the NR system, but may be applied to various wireless communication systems such as LTE, LTE-A, LTE-a-Pro, and 5G. Further, although the disclosure describes a system and apparatus for transmitting and receiving signals using an unlicensed frequency band, the disclosure can also be applied to a system operating in an unlicensed frequency band.

In the present disclosure, the higher layer signaling or the higher signal may be a method of transmitting a signal from the base station to the terminal using a downlink data channel of a physical layer or transmitting a signal from the terminal to the base station using an uplink data channel of a physical layer, and it may include at least one of a transmission method of a signal transmitted through Radio Resource Control (RRC) signaling, Packet Data Convergence Protocol (PDCP) signaling, and Medium Access Control (MAC) Control Element (CE). In addition, the higher layer signaling or higher signal may include system information commonly transmitted to a plurality of terminals, for example, a system information block other than a master information block transmitted through a Physical Broadcast Channel (PBCH). In this case, the MIB may also be included in higher layer signaling.

Fig. 1 illustrates a wireless communication system according to an embodiment of the present disclosure.

Referring to fig. 1, a base station 110, a terminal 120, and a terminal 130 are illustrated as some nodes using radio channels in a wireless communication system. Although only one base station is illustrated in fig. 1, the wireless communication system may also include other base stations that are the same as or similar to base station 110.

Base station 110 is the network infrastructure that provides radio access to terminals 120 and 130. The base station 110 has a coverage area defined as a particular geographic area based on the distance that the base station 110 can transmit signals. In addition to base stations, the base station 110 may be referred to as an Access Point (AP), enodeb (enb), gandeb (gnb), fifth generation node (5G node), radio point, transmission/reception point (TRP), or other terms having the same technical meaning.

Each of the terminals 120 and 130 is a device used by a user, and it performs communication with the base station 110 through a radio channel. According to circumstances, at least one of the terminals 120 and 130 may operate without user participation. That is, at least one of the terminals 120 and 130 is a device performing Machine Type Communication (MTC), and it may not be carried by a user. In addition to the terminals, each of the terminals 120 and 130 may be referred to as a User Equipment (UE), a mobile station, a subscriber station, a remote terminal, a wireless terminal, a user equipment, or other terms having the same technical meaning.

Wireless communication environment 100 may include wireless communication in unlicensed frequency bands. Base station 110, terminal 120, and terminal 130 may transmit and receive radio signals in an unlicensed frequency band (e.g., 5 to 7GHz or 64 to 71 GHz). In the unlicensed frequency band, a cellular communication system and another communication system (e.g., a Wireless Local Area Network (WLAN)) may coexist. In order to guarantee fairness between two communication systems, in other words, to prevent any one system from monopolizing a channel, the base station 110, the terminal 120, and the terminal 130 may perform a channel access procedure of an unlicensed frequency band. As an example of a channel access procedure of an unlicensed band, the base station 110, the terminal 120, and the terminal 130 may perform Listen Before Talk (LBT).

Base station 110, terminal 120, and terminal 130 may transmit and receive radio signals in the millimeter wave (mmWave) frequency band (e.g., 28GHz, 30GHz, 38GHz, and 60 GHz). In this case, in order to improve channel gain, the base station 110, the terminal 120, and the terminal 130 may perform beamforming. Here, the beamforming may include transmission beamforming and reception beamforming. That is, the base station 110, the terminal 120, and the terminal 130 may impart directivity to a transmitted signal or a received signal. To this end, the base station 110, the terminal 120, and the terminal 130 may select a serving beam (112, 113, 121, 131) through a beam search or a beam management procedure. After selecting the serving beam, subsequent communications may be performed over resources that are in a quasi-co-located (QCL) relationship with resources that have transmitted the serving beam.

Fig. 2 illustrates a configuration of a base station in a wireless communication system according to an embodiment of the present disclosure.

The configuration illustrated in fig. 2 can be understood as the configuration of the base station 110. The term "unit" or "device" as used hereinafter may mean a unit that processes at least one function or operation, and it may be implemented by software, hardware, or a combination of software and hardware.

Referring to fig. 2, the base station includes a wireless transceiver 210, a backhaul communication unit 220, a memory 230, and a controller 240.

The wireless transceiver 210 performs the function of transmitting and receiving signals through a radio channel. For example, the wireless transceiver 210 performs a conversion function between a baseband signal and a bit string according to a physical layer standard of the system. For example, during data transmission, the wireless transceiver 210 creates complex symbols by encoding and modulating the transmitted bit string. Further, during data reception, the wireless transceiver 210 recovers the received bit string by demodulating and decoding the baseband signal.

In addition, the wireless transceiver 210 up-converts a baseband signal into a Radio Frequency (RF) band signal to transmit the RF band signal through the antenna, and it down-converts the RF band signal received through the antenna into a baseband signal. To this end, the wireless transceiver 210 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), and an analog-to-digital converter (ADC). Further, the wireless transceiver 210 may include multiple transmit/receive paths. Further, the wireless transceiver 210 may include at least one antenna array consisting of a plurality of antenna elements.

From a hardware perspective, the wireless transceiver 210 may be composed of a digital unit and an analog unit, and the analog unit may be composed of a plurality of sub-units according to an operating power and an operating frequency. The digital unit may be implemented by at least one processor, e.g., a Digital Signal Processor (DSP).

As described above, the wireless transceiver 210 transmits and receives signals. Accordingly, all or part of the wireless transceiver 210 may be referred to as a transmitter, a receiver, or a transceiver. Further, in the following description, this may mean that the transmission and reception performed through the radio channel includes the above-described process performed by the wireless transceiver 210. According to one embodiment, the wireless transceiver 210 may include at least one transceiver.

The backhaul communication unit 220 provides an interface for performing communication with other nodes in the network. That is, the backhaul communication unit 220 converts a bit string transmitted from a base station to another node, such as another access node, another base station, an upper node, or a core network, and it converts a physical signal received from the other node into a bit string.

The memory 230 stores therein data of basic programs, application programs, and configuration information for the operation of the base station. The memory 230 may be comprised of volatile memory, non-volatile memory, or a combination of volatile and non-volatile memory. In addition, the memory 230 provides stored data according to a request from the controller 240. According to one embodiment, memory 230 may include a memory.

The controller 240 controls the overall operation of the base station. For example, the controller 240 sends and receives signals through the wireless transceiver 210 or the backhaul communication unit 220. In addition, the controller 240 records and writes data in the memory 230. Further, the controller 240 may perform protocol stack functions required in a communication standard. According to another implementation, the protocol stack may be included in the wireless transceiver 210. According to one embodiment, the controller 240 may include at least one processor.

According to various embodiments, the controller 240 may perform a control operation to cause the base station to perform operations according to various embodiments to be described later. For example, the controller 240 may perform a channel access procedure for the unlicensed band. For example, a transceiver (e.g., wireless transceiver 210) may receive a signal transmitted in an unlicensed frequency band, and the controller 240 may determine whether the unlicensed frequency band is in an idle state by comparing the strength of the received signal to a threshold predefined or determined by a value of a function that factors in bandwidth. For example, the controller 240 may transmit a control signal to the terminal through the transceiver, or it may receive a control signal from the terminal. The controller 240 may determine the result of transmitting a signal to the terminal based on a control signal or a data signal received from the terminal. For example, the controller 240 may maintain or change a contention window value of a channel access procedure (hereinafter, referred to as "performing contention window adjustment"). According to various embodiments, the controller 240 may determine the reference time slot in order to obtain the contention window adjusted transmission result. The controller 240 may determine a reference control channel for contention window adjustment in a reference slot. The controller 240 may occupy the channel if it is determined that the unlicensed band is in an idle state.

Fig. 3 illustrates a configuration of a terminal in a wireless communication system according to an embodiment of the present disclosure. The configuration illustrated in fig. 3 may be understood as a configuration of the terminal 120. The term "unit" or "device" as used hereinafter may denote a unit for processing at least one function or operation, and it may be implemented by software, hardware, or a combination of software and hardware.

Referring to fig. 3, the terminal includes a transceiver 310, a memory 320, and a controller 330.

The transceiver 310 performs a function of transmitting and receiving signals through a radio channel. For example, the transceiver 310 performs a conversion function between a baseband signal and a bit string according to a physical layer standard of the system. For example, during data transmission, the transceiver 310 creates complex symbols by encoding and modulating the transmitted bit string. Further, during data reception, the transceiver 310 recovers the received bit string by demodulating and decoding the baseband signal. In addition, the transceiver 310 up-converts a baseband signal into an RF band signal to transmit the RF band signal through the antenna, and it down-converts the RF band signal received through the antenna into a baseband signal. For example, the transceiver 310 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, and an ADC.

Further, the transceiver 310 may include a plurality of transmission/reception paths. Further, the transceiver 310 may include at least one antenna array composed of a plurality of antenna elements. From a hardware perspective, the transceiver 310 may be comprised of digital circuitry and analog circuitry (e.g., a Radio Frequency Integrated Circuit (RFIC)). Here, the digital circuit and the analog circuit may be implemented by one package. Further, the transceiver 310 may include a plurality of RF chains. Further, the transceiver 310 may perform beamforming.

As described above, the transceiver 310 transmits and receives signals. Accordingly, all or part of the transceiver 310 may be referred to as a transmitter or a receiver. Further, in the following description, this may mean that transmission and reception performed through a radio channel includes the above-described process performed by the transceiver 310. According to one embodiment, the transceiver 310 may include at least one transceiver.

The memory 320 stores therein data of basic programs, application programs, and configuration information for the operation of the terminal. The memory 320 may be comprised of volatile memory, non-volatile memory, or a combination of volatile and non-volatile memory. In addition, the memory 320 provides stored data according to a request from the controller 330. According to one embodiment, memory 320 may include memory.

The controller 330 controls the overall operation of the terminal. For example, the controller 330 transmits and receives signals through the transceiver 310. In addition, the controller 330 records and writes data in the memory 320. Further, the controller 330 may perform protocol stack functions required in a communication standard. To this end, the controller 330 may include at least one processor or microprocessor, or it may be part of a processor. According to one embodiment, the controller 330 may include at least one processor. Further, according to one embodiment, portions of the transceiver 310 and/or the controller 330 may be referred to as a Communication Processor (CP).

According to various embodiments, the controller 330 may perform a control operation such that the terminal performs operations according to various embodiments to be described later. For example, the controller 330 may receive a downlink signal (downlink control signal or downlink data) transmitted by the base station through a transceiver (e.g., the transceiver 310). For example, the controller 330 may determine the result of transmitting downlink data. The transmission result may include feedback information on ACK, NACK, and DTX of the transmitted downlink signal. In the present disclosure, the transmission result may be referred to as various terms such as a reception state of a downlink signal, a reception result, a decoding result, and HARQ-ACK information. For example, the controller 330 may transmit an uplink signal to the base station through the transceiver as a response signal to the downlink signal. The uplink signal may explicitly or implicitly include the result of transmitting the downlink signal.

The controller 330 may perform a channel access procedure for the unlicensed band. For example, a transceiver (e.g., transceiver 310) may receive a signal transmitted in an unlicensed frequency band, and controller 330 may determine whether the unlicensed frequency band is in an idle state by comparing the strength of the received signal to a threshold predefined or determined by a value of a function that factors in bandwidth. The controller 330 may perform an access procedure of the unlicensed frequency band to transmit a signal to the base station.

Fig. 4 illustrates a configuration of a communication unit in a wireless communication system according to an embodiment of the present disclosure. Fig. 4 illustrates an example of a detailed configuration of the wireless transceiver 210 of fig. 2 or the communication unit 310 of fig. 3. In particular, fig. 4 illustrates constituent elements that perform beamforming as part of the wireless transceiver 210 of fig. 2 or the communication unit 310 of fig. 3.

Referring to fig. 4, the wireless transceiver 210 or transceiver 310 includes an encoder and modulator 402, a digital beamformer 404, a plurality of transmission paths 406-1 through 406-N, and an analog beamformer 408.

The encoder and modulator 402 performs channel coding. For such channel coding, at least one of a Low Density Parity Check (LDPC) code, a convolutional code, and a polar code. The encoder and modulator 402 creates modulation symbols by performing constellation mapping.

Digital beamformer 404 performs beamforming on digital signals (e.g., modulation symbols). To this end, the digital beamformer 404 multiplies the modulation symbols by beamforming weights. Here, the beamforming weights are used to change the level and phase of the signals, and may be referred to as a precoding matrix or a precoder. Digital beamformer 404 outputs digitally beamformed modulation symbols to a plurality of transmission paths 406-1 through 406-N. In this case, modulation symbols may be multiplexed or the same modulation symbol may be provided to multiple transmission paths 406-1 to 406-N according to a multiple-input multiple-output (MIMO) transmission technique.

The multiple transmission paths 406-1 to 406-N convert the digital beamformed digital signals to analog signals. To this end, each of the plurality of transmission paths 406-1 to 406-N may include an Inverse Fast Fourier Transform (IFFT) operation unit, a Cyclic Prefix (CP) insertion unit, a DAC, and an up-conversion unit. The CP insertion unit is used for an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and may be omitted if a different physical layer scheme (e.g., filter bank multi-carrier (FBMC)) is applied. That is, the multiple transmission paths 406-1 to 406-N provide independent signal processes with respect to multiple streams created by digital beamforming. However, depending on the implementation, some of the constituent elements of the multiple transmission paths 406-1 to 406-N may be shared.

The analog beamformer 408 performs beamforming on the analog signals. To this end, the analog beamformer 408 multiplies the analog signals by beamforming weights. Here, the beamforming weights are used to change the level and phase of the signals. Specifically, the analog beamformer 408 may be configured differently according to a connection structure between the plurality of transmission paths 406-1 to 406-N and the antenna. For example, each of the plurality of transmission paths 406-1 to 406-N may be connected to an antenna array. As another example, multiple transmission paths 406-1 to 406-N may be connected to one antenna array. As yet another example, multiple transmission paths 406-1 to 406-N may be adaptively connected to one antenna array, or they may be connected to two or more antenna arrays.

In the 5G system, a frame structure needs to be flexibly defined in consideration of various services and requirements. For example, the respective services may have different subcarrier spacings as required. The 5G communication system currently supports a plurality of subcarrier spacings, and the subcarrier spacing may be determined by mathematical expression 1.

[ mathematical expression 1]

Δf＝f₀2^m

In mathematical expression 1, f₀Denotes the basic subcarrier spacing of the system, m denotes an integer scaling factor, and Δ f denotes the subcarrier spacing. For example, if f₀At 15kHz, the 5G communication system may have a subcarrier spacing set that may consist of one of 3.75kHz, 7.5kHz, 15kHz, 30kHz, 60kHz, 120kHz, 240kHz, and 480 kHz. The available subcarrier spacing set may differ depending on the frequency band. For example, in a frequency band equal to or lower than 6GHz, 3.75kHz, 7.5kHz, 15kHz, 30kHz and 60kHz may be used, and in a frequency band higher than 6GHz, 60kHz, 120kHz and 240kHz may be used.

In various embodiments, the duration of a corresponding OFDM symbol may differ depending on the subcarrier spacing that makes up the OFDM symbol. This is because the subcarrier spacing and the OFDM symbol duration are inverse relationships to each other according to the characteristics of the OFDM symbol. For example, if the subcarrier spacing increases by a factor of two, the symbol duration decreases to 1/2, and conversely, if the subcarrier spacing decreases to 1/2, the symbol duration increases by a factor of two.

Fig. 5 illustrates an example of a radio resource region in a wireless communication system according to an embodiment of the present disclosure. In various embodiments, the radio resource region may include a structure of time-frequency regions. In various embodiments, the wireless communication system may comprise an NR communication system.

Referring to fig. 5, in a radio resource region, the horizontal axis represents a time domain, and the vertical axis represents a frequency domain. In the time domain, the smallest transmission unit may be an Orthogonal Frequency Division Multiplexing (OFDM) and/or Discrete Fourier Transform (DFT) spread OFDM (DFT-s-OFDM) symbol, and N_symbThe individual OFDM symbols 102 and/or DFT-s-OFDM symbols 501 may be aggregated to form a slot 502. In various embodiments, the OFDM symbol may include a symbol in the case of transmitting/receiving a signal using an OFDM multiplexing scheme, and the DFT-s-OFDM symbol may include a symbol in the case of transmitting/receiving a signal using a DFT-s-OFDM or single carrier frequency division multiple access (SC-FDMA) multiplexing scheme. Hereinafter, in the present disclosure, for convenience of explanation, an embodiment of an OFDM symbol will be described, but suchThe embodiments are also applicable to embodiments of DFT-s-OFDM symbols. Furthermore, although embodiments of the present disclosure will be described with respect to OFDM symbols for ease of explanation, such embodiments may also be applicable to embodiments of DFT-s-OFDM symbols. Furthermore, although embodiments of the present disclosure will be described with respect to downlink signal transmission and reception for ease of explanation, such embodiments may also be applicable to uplink signal transmission and reception embodiments.

If the subcarrier spacing (SCS) is 15kHz, one slot 502 constitutes one subframe 503, contrary to what is shown in fig. 5, and the duration of the slot 502 or the subframe 503 may be 1 ms. In various embodiments, the number of slots 502 and the duration of the slots 502 constituting one subframe 503 may be different according to subcarrier spacing. For example, if the subcarrier spacing is 30kHz, two slots 502 may constitute one subframe 503. In this case, the duration of the slot 502 is 0.5ms and the duration of the subframe 503 is 1 ms. Further, the radio frame 504 may be a time domain interval consisting of 10 subframes. In the frequency domain, the minimum transmission unit is a subcarrier, and a carrier bandwidth configuring a resource grid may be made up of N in total_SC ^BWThe subcarriers 505.

However, the subcarrier spacing, the number of slots 502 included in the subframe 503, the duration of the slot 502, and the duration of the subframe 503 may be variably applied. For example, in the case of the LTE system, the subcarrier spacing is 15kHz, and two slots constitute one subframe 503. In this case, the duration of the slot 502 may be 0.5ms, and the duration of the subframe 503 may be 1 ms. In another example, in the case of the NR system, the subcarrier spacing m may be one of 15kHz, 30kHz, 60kHz, 120kHz, and 240kHz, and the number of slots included in one subframe may be 1,2, 4, 8, or 16 according to the subcarrier spacing m.

In the time-frequency domain, a basic unit of resources may be a Resource Element (RE)506, and the resource element 506 may be expressed by an OFDM symbol index and a subcarrier index. In an LTE system, a Resource Block (RB) (or Physical Resource Block (PRB)) may consist of N in the time domain_symbOFDM symbol and N in frequency domain_SC ^RBA number of consecutive sub-carriers. The number of symbols included in one RB may be N_symbThe number of subcarriers may be N ═ 14_SC ^RB12, and the number of RBs (N) may be changed according to the bandwidth of the system transmission band_RB). In the NR system, Resource Block (RB)507 may be defined by N_SC ^RBA number of consecutive subcarriers 508. The number of subcarriers may be N_SC ^RB12. The frequency domain may include a Common Resource Block (CRB), and a Physical Resource Block (PRB) may be defined in a bandwidth part (BWP) on the frequency domain. The number of CRBs and PRBs may be variously determined according to subcarrier spacing.

The downlink control information may be transmitted in the initial N OFDM symbol(s) within the slot. In general, the number may be N ═ {1,2,3}, and the terminal may configure the number of symbols by the base station, where the downlink control information may be transmitted through higher layer signaling. Further, the base station may change the number of symbols per slot according to the amount of control information to be transmitted in the current slot, wherein the downlink control information may be transmitted in the slot, and it may transmit information on the number of symbols to the terminal on a separate downlink control channel.

In the NR and/or LTE system, scheduling information regarding downlink data or uplink data may be transmitted from a base station to a terminal through Downlink Control Information (DCI). In various embodiments, the DCI may be defined according to various formats, and each format may indicate whether the DCI includes scheduling information (e.g., UL grant) on uplink data or scheduling information (DL grant) on downlink data, whether the DCI is a compact DCI or a fallback DCI having small-size control information, whether spatial multiplexing using multiple antennas is applied, and/or whether the DCI is a DCI for power control.

For example, a DCI format (e.g., DCI format 1_0 of NR) which is scheduling control information (DL grant) on downlink data may include at least one of the following control information.

-control information (DCI) format identifier: this is an identifier for identifying the DCI format.

-frequency domain resource allocation: this indicates the RB allocated for data transmission.

-time domain resource allocation: this indicates the time slots and symbols allocated for data transmission.

-VRB to PRB mapping: this indicates whether a virtual resource block (BRB) mapping scheme is applied.

Modulation and Coding Scheme (MCS): this indicates a modulation scheme used for data transmission and a size of a Transport Block (TB) that is data intended to be transmitted.

-new data indicator: this indicates whether HARQ is initially transmitted or retransmitted.

-redundancy version: this indicates the redundancy version of HARQ.

-HARQ process number: this indicates the process number of HARQ.

PDSCH allocation information (downlink allocation index): this indicates the number of PDSCH reception results (e.g., the number of HARQ-ACKs) to be reported from the terminal to the base station.

-transmit power control (TCP) commands of the Physical Uplink Control Channel (PUCCH): this indicates a transmission power control command of the PUCCH which is an uplink control channel.

-PUCCH resource indicator: this indicates PUCCH resources for reporting HARQ-ACK including reception results of PDSCH configured by corresponding DCI.

PUCCH transmit timing indicator (PDSCH-to-HARQ feedback timing indicator): this indicates slot or symbol information in which a PUCCH for HARQ-ACK report including a reception result of a PDSCH configured by a corresponding DCI should be transmitted.

The DCI may pass through a channel coding and modulation process, and it may be transmitted on a Physical Downlink Control Channel (PDCCH), i.e., a downlink physical control channel (or control information, hereinafter used interchangeably) or an enhanced PDCCH (epdcch) (or enhanced control information, hereinafter used interchangeably). Hereinafter, transmission/reception of PDCCH or EPDCCH may be understood as DCI transmission/reception on PDCCH or EPDCCH, and transmission/reception of Physical Downlink Shared Channel (PDSCH) may be understood as downlink data transmission/reception on PDSCH.

In various embodiments, a Cyclic Redundancy Check (CRC) scrambled with a specific Radio Network Temporary Identifier (RNTI) (or a terminal identifier (C-RNTI) (Cell-RNTI)) that is independent with respect to each terminal may be added to the DCI, and the DCI for each terminal may be channel coded and then configured and transmitted on an independent PDCCH.

The downlink data may be transmitted on a Physical Downlink Shared Channel (PDSCH) which is a physical channel for transmitting the downlink data. The PDSCH may be transmitted after the control channel transmission interval, and in the frequency domain, scheduling information such as a PDSCH mapping location and a PDSCH modulation scheme may be determined based on DCI transmitted on the PDCCH.

The base station can notify the terminal of a modulation scheme applied to the PDSCH to be transmitted and a Transport Block Size (TBS) of data to be transmitted, through a Modulation and Coding Scheme (MCS) in control information constituting the DCI. In various embodiments, the MCS may consist of 5 bits or more or less. The TBS corresponds to the size of data (transport block (TB)) that the base station intends to transmit before applying channel coding for error correction to the TB.

In the NR system, the modulation scheme supporting uplink and downlink data transmission may include at least one of Quadrature Phase Shift Keying (QPSK), 16 quadrature amplitude modulation (16QAM), 64QAM, and 256QAM, and a corresponding modulation order Q_mMay be 2, 4, 6 and 8. That is, in the case of QPSK modulation, 2 bits may be transmitted per symbol, and in the case of 16QAM modulation, 4 bits may be transmitted per symbol. Furthermore, 6 bits may be transmitted per symbol in the case of 64QAM modulation, and per symbol in the case of 256QAM modulationOne symbol may transmit 8 bits. Further, a modulation scheme on 256QAM may be used, depending on system modifications.

In the case of a system that performs communication in an unlicensed band, a communication device (base station or terminal) intending to transmit a signal through the unlicensed band may perform a channel access procedure or Listen Before Talk (LBT) on the unlicensed band intended to perform communication before transmitting the signal, and if it is determined from the channel access procedure that the unlicensed band is in an idle state, the communication device may perform signal transmission by accessing the unlicensed band. The communication device may not perform signal transmission if it is determined that the unlicensed band is not in an idle state according to the performed channel access procedure.

Channel access procedures in the unlicensed frequency band may be distinguished depending on whether a start time of a channel access procedure of a communication device is fixed (frame-based device (FBE)) or variable (load-based device (LBE)). In addition to the start time of the channel access procedure, whether the communication device is an FBE device or an LBE device may be determined depending on whether a transmission/reception structure of the communication device has one period or does not have the period. Here, the fact that the start time of the channel access procedure is fixed means that the channel access procedure of the communication device may be started periodically according to a predefined period or a period declared or configured by the communication device. As another example, the fact that the start time of the channel access procedure is fixed may mean that the transmission or reception structure of the communication device has one period. Here, the fact that the start time of the channel access procedure is variable means that the channel access procedure of the communication device can be started at any time when the communication device intends to transmit a signal through the unlicensed frequency band. As yet another example, the fact that the start time of the channel access procedure is variable means that the transmission or reception structure of the communication device does not have a period, but it can be determined as needed.

Hereinafter, a channel access procedure (hereinafter, a traffic-based channel access procedure or an LBE-based channel access procedure) in the case where a start time of the channel access procedure of the communication device is variable (load-based device (LBE)) will be described.

The channel access procedure in the unlicensed band may include the following procedures: the idle state of the unlicensed band is determined by measuring the received signal strength of the unlicensed band for a fixed time or for a time calculated according to a predefined rule (e.g., a time calculated by at least one random value selected by the base station or the terminal), and comparing the measured signal strength with a predefined threshold or a threshold calculated by a function that determines the strength level of the received signal according to at least one variable among a channel bandwidth, a signal bandwidth in which a signal intended to be transmitted is transmitted, and/or a transmission power strength.

For example, the communication device may measure the signal strength Xms (e.g., 25ms) immediately before the time the signal is transmitted, and if the measured signal strength is below a predefined or calculated threshold T (e.g., -72dBm), the communication device may determine that the unlicensed frequency band is in an idle state, and it may transmit the configured signal. In this case, the maximum time during which continuous signal transmission can be performed after the channel access procedure may be limited depending on the maximum channel occupying time, which is defined for each country, region, or frequency band according to each unlicensed frequency band, and may also be limited depending on the type of communication device (e.g., a base station or terminal, or a master device or a slave device). For example, in the case of japan, in a 5GHz unlicensed band, a base station or a terminal can transmit a signal by occupying a channel with respect to an unlicensed band, which is determined to have a maximum time of 4ms in an idle state without performing an additional channel access procedure after performing a channel access procedure.

More specifically, in the case where a base station or a terminal intends to transmit downlink or uplink signals using an unlicensed frequency band, a channel access procedure that can be performed by the base station or the terminal can be distinguished into at least the following types.

-type 1: it transmits uplink/downlink signals after performing a channel access procedure for a variable time.

-type 2: it transmits uplink/downlink signals after performing a channel access procedure for a fixed time.

-type 3: it transmits an uplink/downlink signal without performing an LBT procedure in which another node determines channel occupancy in a channel access procedure.

A transmission device (e.g., a base station or a terminal) intending to transmit a signal in an unlicensed frequency band may determine the type of channel access procedure according to the kind of a signal to be transmitted. In the third generation partnership project (3GPP), LBT procedures as a channel access scheme may be classified into four types. The four classes may include a first class in which LBT is not performed, a second class in which LBT is performed without random backoff, a third class in which LBT is performed by random backoff in a contention window of a fixed size, and a fourth class in which LBT is performed by random backoff in a contention window of a variable size. According to one embodiment, in case of type 1, the third and fourth classes may be instantiated, and in case of type 2, the second class may be instantiated. Further, in the case of type 3, the first type may be exemplified.

In the present disclosure, for convenience of explanation, it may be assumed that the transmission apparatus is a base station, and the transmission apparatus and the base station may be used interchangeably.

For example, if the base station intends to transmit a downlink signal including a downlink data channel in an unlicensed frequency band, the base station may perform a channel access procedure of type 1. Further, if the base station intends to transmit a downlink signal not including a downlink data channel in the unlicensed frequency band, for example, if the base station intends to transmit a synchronization signal or a downlink control channel, the base station may perform a channel access procedure of type 2 and the base station may transmit the downlink signal.

In this case, the type of the channel access procedure may be determined according to the transmission interval of a signal intended to be transmitted in the unlicensed frequency band, the occupation, and the size of the time or interval for using the unlicensed frequency band. In general, the time for performing the channel access procedure may be longer in type 1 than in type 2. Accordingly, if the communication device intends to transmit a signal within a short duration or within a time equal to or shorter than a reference time (e.g., Xms or Y symbol), a channel access procedure of type 2 may be performed. Conversely, if the communication device intends to transmit a signal for a long duration or for a time exceeding a reference time (e.g., an Xms or Y symbol), a type 1 channel access procedure may be performed. In other words, different types of channel access procedures may be performed according to the usage time of the unlicensed band.

If the transmitting device performs a channel access procedure of type 1 according to at least one of the above-mentioned references, the transmitting device intending to transmit a signal in the unlicensed frequency band may determine a channel access priority class (or channel access priority) according to a quality of service class identifier (QCI) of a signal intending to transmit in the unlicensed frequency band, and the transmitting device may perform the channel access procedure using at least one of predefined configuration values as in table 1 with respect to the determined channel access priority class. Table 1 below shows a mapping relationship between the channel access priority classes and the QCIs.

For example, QCI 1,2, or 4 may mean a QCI value for a service, such as conversational voice, conversational video (real-time streaming media), or non-conversational video (buffered streaming media). If a signal of a service that does not match the QCI of table 1 is intended to be transmitted in the unlicensed band, the transmitting device may select the QCI closest to the QCI of table 1, and the transmitting device may select a channel access priority class of the selected QCI.

TABLE 1

Channel access priority	QCI
		1	1,3,5,65,66,69,70
2	2,7
		3	4,6,8,9
4	-

In various embodiments, the parameter value of the channel access priority class (e.g., the set CW of contention window values or sizes according to the determined deferral duration of the channel access priority p_pAnd the minimum value CW of the contention window_min,pAnd maximum value CW_max,pAnd maximum channel occupancy possible duration T_mcot,p) Can be determined as in table 2. Table 2 shows parameter values of channel access priority classes in the case of downlink.

Fig. 6 is a diagram illustrating an example of a channel access procedure in an unlicensed band in a wireless communication system according to an embodiment of the present disclosure. A case where the base station performs a channel access procedure occupying an unlicensed band will be described. The base station 110 of fig. 1 is illustrated as a base station.

Referring to fig. 6, a base station intending to transmit a downlink signal in an unlicensed frequency band may be at T_f+m_p*T_slPerforms a channel access procedure for the unlicensed band for a minimum time (e.g., the deferral duration 612 of fig. 6). If a base station intends to perform a channel access procedure with a channel access priority class 3 (p-3), a deferral duration size T required for performing the channel access procedure is aimed at_f+m_p*T_slCan use m_p3 pairs of T_f+m_p*T_slIs configured. Here, T_fIs fixed to a value of 16ms (e.g., duration 610 of fig. 6), and an initial time T_slShould be in an idle state, and at time T_fTime T in_slThe remaining time T thereafter_f-T_slRadical ofA station may not perform a channel access procedure. In this case, even if the base station has been in the remaining time T_f-T_slA channel access procedure is performed, and the result of the channel access procedure may not be used. In other words, the time T_f-T_slIs the time the base station defers performing the channel access procedure.

If it is determined that the unlicensed band is present for the entire time m_p*T_slAlways in the idle state, the number N may be N-1. In this case, the number N may be selected to be some integer value between 0 and the contention window value CWp at the time the channel access procedure is performed. In the case where the channel access priority class is 3, the minimum contention window value and the maximum contention window value are 15 and 63, respectively. If it is determined that the unlicensed frequency band is in an idle state for the deferral duration and the additional duration while the channel access procedure is performed, the base station may pass through the unlicensed frequency band at time T_mcot,pThe signal is transmitted within (8 ms). Meanwhile, table 2 shows channel access priority classes (or channel access priorities) in the downlink. In this disclosure, for ease of illustration, embodiments are described based on downlink channel access priority classes. In the case of uplink, the channel access priority classes in table 2 may be used in the same manner, or a separate channel access priority class may be used for uplink transmission.

TABLE 2

Initial contention window value CW_pIs the minimum contention window value CW_min,p. The base station having selected the value N may be for the duration T_sl(e.g., slot duration 620 of fig. 6) and if so, for a duration T_slThe base station may change the value N to N-1 if the channel access procedure performed in (2) determines that the unlicensed frequency band is in an idle state. In case that N is 0, the base station may be at the maximum time T_mcot，p(e.g., maximum occupancy time 630 of FIG. 6) pass throughThe unlicensed frequency band transmits a signal. If at time T_slThe unlicensed band determined through the channel access procedure is not in an idle state, the base station may re-perform the channel access procedure without changing the value N. The contention window value CW may be changed or maintained according to a ratio Z of NACKs in reception results ACK/NACK of downlink data (i.e., downlink data received in a reference subframe or reference slot or reference transmission time interval (reference TTI)) that one or more terminals have transmitted or reported to the base station_pThe one or more terminals have received downlink data transmitted through a downlink data channel (PDSCH 662) and downlink control information transmitted through a downlink control channel (PDCCH 660) in a reference subframe or reference slot or reference transmission time interval (reference TTI). In this case, the reference subframe or reference slot or reference transmission time interval (reference TTI) may be determined as a first subframe or slot or Transmission Time Interval (TTI) of a downlink signal transmission interval (or Maximum Channel Occupancy Time (MCOT)), or a starting subframe or starting slot or starting transmission interval of a transmission interval, which the base station has recently transmitted through an unlicensed frequency band when the base station starts a channel access procedure, when the base station selects a value N to perform a channel access procedure, or immediately before two time points.

Referring to fig. 6, a base station may attempt channel access to occupy an unlicensed frequency band. A first slot (or a starting slot of a starting channel occupation time) or a subframe or a transmission interval 640 of a downlink signal transmission interval (a channel occupation time (hereinafter, abbreviated as COT)630) that the base station has recently transmitted through the unlicensed frequency band at a time 670 when the base station starts a channel access procedure, when the base station selects a value N to perform the channel access procedure, or immediately before a time point may be defined as a reference slot or a reference subframe or a reference transmission interval. For convenience of explanation, it will be denoted as a reference slot hereinafter. Specifically, one or more consecutive slots including the first slot in which a signal is transmitted in the entire slot of the downlink signal transmission interval 630 may be defined as a reference slot. Further, according to an embodiment, if the downlink signal transmission interval starts after the first symbol of the slot, the slot where the downlink signal transmission starts and the next slot may be defined as the reference slot. In the reference slot, if the ratio of NACKs in the reception results of downlink data, which one or more terminals have transmitted or reported to the base station, is equal to or greater than Z, the one or more terminals have received the downlink data transmitted through the downlink data channel in the reference slot, the base station may determine a contention window value or size used in the channel access procedure 670 of the corresponding base station to be greater than a contention window value or size used in the previous channel access procedure 602. In other words, the base station may increase the size of the contention window used in the channel access procedure 602. The base station may perform the next channel access procedure 670 by selecting a value N633 within a range defined according to a contention window having an increased size.

If the base station cannot acquire the reception result of the downlink data channel transmitted by the base station in the reference slot of the transmission interval 630, for example, if the time interval between the reference slot and the time 670 at which the base station starts the channel access procedure is equal to or less than n slots or symbols (in other words, if the base station starts the channel access procedure before the minimum time when the terminal can report the reception result of the downlink data channel transmitted in the reference slot to the base station), the first slot of the latest downlink signal transmission interval transmitted before the downlink signal transmission interval 630 may become the reference slot.

In other words, if the base station cannot receive the reception result of the downlink data transmitted from the terminal at the time 670 at which the base station starts the channel access procedure, or at the time when the base station selects the value N to perform the channel access procedure, or immediately before the time point, the base station may determine the contention window using the reception result of the downlink data of the terminal of the reference slot in the downlink signal transmission interval most recently transmitted among the reception results of the downlink data channel that have been received from the terminal. Further, the base station may determine a contention window size used in the channel access procedure 670 using a reception result of downlink data received from the terminal with respect to downlink data transmitted on a downlink data channel in the reference slot.

For example, if 80% or more of the reception result of downlink data transmitted to the terminal on the downlink data channel in the reference slot is determined to be NACK in the downlink signal transmitted through the unlicensed band, the base station may set the contention window from an initial value (CW)_p15) to the next contention window value (CW)_p31), the base station has transmitted a downlink signal through a channel access procedure (e.g., CWp-15) configured according to the channel access priority class 3 (p-3). The ratio value of 80% is exemplary, and various modifications thereof are possible.

If 80% or more of the reception result of the terminal is not determined as NACK, the base station may maintain the contention window value as an existing value or the base station may change the contention window value to an initial value. In this case, the change of the contention window may be applied to all channel access priority classes in common, or the change of the contention window may be applied only to the channel access priority classes used in the channel access procedure. In this case, a method of determining a reception result, which is effective to determine a change in the contention window size among the reception results of the downlink data, is as follows, and the terminal transmits or reports the reception result of the downlink data to the base station with respect to the downlink data transmitted on the downlink data channel in the reference slot in which the change in the contention window size is determined, in other words, a method of determining the value Z is as follows.

If the base station transmits one or more Codewords (CWs) or TBs to one or more terminals in a reference slot, the base station may determine the value Z by a NACK ratio in a reception result transmitted or reported by the terminal with respect to the TB received by the terminal in the reference slot. For example, if two codewords or two TBs are transmitted to one terminal in a reference slot, the base station may receive a reception result (report) of downlink data signals of the two TBs from the terminal. If the NACK ratio Z of the two reception results is predefined or equal to or higher than a threshold value configured between the base station and the terminal (e.g., Z-80%), the base station may change or increase the contention window size.

In this case, if the terminal transmits or reports a reception result of downlink data of one or more slots (e.g., M slots) including the reference slot to the base station through bundling, the base station may determine that the terminal has transmitted M reception results. Further, the base station may determine the value Z as a ratio of NACKs among the M reception results, and it may change, maintain, or initialize the contention window size.

If the reference slot corresponds to a second slot of two slots included in one subframe or if a downlink signal is transmitted from a symbol after a first symbol in the reference slot, the reference slot and a next slot may be determined as the reference slot, and the value Z may be determined as a ratio of NACKs in a reception result of the downlink data received in the reference slot, which is transmitted or reported by the terminal to the base station.

Further, if the scheduling information or the downlink control information of the downlink data channel transmitted by the base station is transmitted from a cell or a frequency band equal to a cell or a frequency band transmitting the downlink data channel, if the scheduling information or the downlink control information of the downlink data channel transmitted by the base station is transmitted through an unlicensed frequency band or is transmitted from a cell or a frequency band different from the cell or the frequency band transmitting the downlink data channel, if it is determined that the terminal does not transmit the reception result of the downlink data received in the reference slot, or if it is determined that the reception result of the downlink data transmitted by the terminal is at least one of Discontinuous Transmission (DTX), NACK/DTX, and any state, the base station may determine the value Z by determining the reception result of the terminal as NACK.

Further, if it is determined that the reception result of the downlink data transmitted by the terminal is at least one of DTX, NACK/DTX, and any state in which the scheduling information of the downlink data channel and the downlink control information transmitted by the base station are transmitted through the licensed band, the base station may not reflect the reception result of the terminal in the reference value Z in which the contention window varies. In other words, the base station can determine the value Z by ignoring the reception result of the terminal.

Further, if the base station transmits scheduling information or downlink control information of a downlink data channel through a licensed frequency band, or if the base station does not actually transmit downlink data (no transmission) in a reception result of the downlink data of a reference time slot that the terminal has transmitted or reported to the base station, the base station may determine the value Z by ignoring the reception result on the downlink data transmitted or reported by the terminal.

Hereinafter, a channel access procedure (hereinafter, referred to as a frame-based channel access procedure or an FBE-based channel access procedure) in the case where a start time of a channel access procedure of a communication device is fixed (frame-based device (FBE)) will be described using fig. 7.

Fig. 7 illustrates another example of a channel access procedure in an unlicensed frequency band in a wireless communication system according to an embodiment of the present disclosure.

Referring to fig. 7, a communication device performing a frame-based channel access procedure may periodically transmit and receive signals according to a Fixed Frame Period (FFP). Here, the fixed frame period 700 may be declared or configured by a communication device (e.g., a base station), and it may be configured in the range of 1ms to 10 ms. In this case, a channel access procedure (or a Clear Channel Access (CCA)) of the unlicensed band may be performed immediately before the start of each of the frame periods 730, 733, and 736, and the channel access procedure may be performed for a fixed time or one observation slot in the same manner as the above-described channel access procedure of type 2. If the unlicensed band is in an idle state due to the channel access procedure, or if it is determined that the unlicensed band is in an idle state, the communication device may transmit and receive signals (740, 745) without performing a separate channel access procedure for up to 95% of a fixed frame period 700 (hereinafter, a Channel Occupancy Time (COT) 710). In this case, a minimum of 5% of the fixed frame period 700 is an idle time 720 during which a signal cannot be transmitted or received, and a channel access procedure may be performed during the idle time 720.

The frame-based channel access procedure has an advantage of being relatively simpler than the traffic-based channel access procedure, and the frame-based channel access procedure can periodically perform channel access of the unlicensed frequency band. However, since the start time of the channel access procedure is fixed, the probability of being able to access the unlicensed band may be reduced compared to the traffic-based channel access procedure.

Fig. 8 is a diagram illustrating an example of scheduling and feedback in a wireless communication system according to an embodiment of the present disclosure. The base station may transmit control information including downlink and/or uplink scheduling to the terminal. The base station may transmit downlink data to the terminal. The terminal may transmit HARQ-ACK information as feedback of downlink data to the base station. Further, the terminal may transmit uplink data to the base station. In the NR system, the uplink and downlink HARQ schemes may include an asynchronous HARQ scheme in which a data retransmission time is not fixed. For example, in case of downlink, if the base station receives feedback of HARQ NACK regarding initially transmitted data from the terminal, the base station can freely determine a transmission time of retransmitted data according to a scheduling operation. The terminal may perform buffering on data, which is determined to be erroneous as a result of decoding the received data for the HARQ operation, and then may perform combining the buffered data with data retransmitted from the base station. The base station is exemplified by the base station 110 of fig. 1. The terminal is exemplified by the terminal 120 or the terminal 130 of fig. 1.

Referring to fig. 8, a resource region of a data channel is transmitted in a 5G or NR communication system. The terminal may monitor and/or search for a downlink control channel (hereinafter PDCCH) region (hereinafter control resource set (CORESET) or Search Space (SS)) 810. In this case, the downlink control channel region may be composed of information of the time domain 814 and the frequency domain 812, and the information of the time domain 814 may be configured in symbol units, and the information of the frequency domain 812 may be configured in RB or RB group units.

If the terminal detects the PDCCH810 in the slot i 800, the terminal can obtain Downlink Control Information (DCI) transmitted on the detected PDCCH 810. Through the received Downlink Control Information (DCI), the terminal can obtain scheduling information on a downlink data channel or an uplink data channel 840. In other words, the DCI may include at least resource region (or PDSCH transmission region) information on which the terminal should receive a downlink data channel (hereinafter, referred to as PDSCH) transmitted from the base station or resource region information that the terminal is allocated from the base station for uplink data channel (PUSCH) transmission.

A case where a terminal is scheduled using uplink data channel (PUSCH) transmission will be described as an example. A terminal having received DCI can acquire a slot index or offset information K required to receive PUSCH through DCI, and it can determine a PUSCH transmission slot index. For example, the terminal may determine to be scheduled to transmit PUSCH in slot i + K805 through the received offset information K based on the slot index i 800 of having received PDCCH 810. In this case, the terminal may determine the PUSCH start symbol or time in slot i + K805 or slot i + K based on the CORESET having received PDCCH810 through the received offset information K.

Further, the terminal can acquire information on the PUSCH transmission time-frequency resource region 840 in the PUSCH transmission slot 805 through DCI. The PUSCH transmission frequency resource region information 830 may include Physical Resource Blocks (PRBs) or group unit information of the PRBs. Meanwhile, the PUSCH transmission frequency resource region information 830 may be information on a region included in an initial uplink Bandwidth (BW) or an initial uplink bandwidth part (BWP)835 determined or configured by an initial access procedure of the terminal. The PUSCH transmission frequency resource region information 830 may be information on a region included in an uplink Bandwidth (BW) or an uplink bandwidth part (BWP) configured by a higher signal if the terminal configures the uplink Bandwidth (BW) or the uplink bandwidth part (BWP) by the higher signal.

In various embodiments, the PUSCH transmission time resource region information 825 may be symbol or symbol group unit information, or it may be information indicating absolute time information. The PUSCH transmission time resource region information 825 may be expressed as a combination of a PUSCH transmission start time or symbol and a PUSCH or PUSCH end time or a duration of a symbol, and the PUSCH transmission time resource region information 825 may be included in DCI as one field or value. The terminal may transmit the PUSCH on the PUSCH transmission resource region 840 determined through the DCI.

In various embodiments, a terminal having received PDSCH 840 may report (feed back) the reception result (e.g., HARQ-ACK/NSCK) of PDSCH 840 to the base station. In this case, based on a PDSCH-to-HARQ timing indicator and a PUCCH resource indicator indicated by DCI of PDCCH810 for scheduling PDSCH 840, a transmission resource of uplink control channel (PUCCH)870 for transmitting a reception result of PDSCH 840 may be determined by the terminal. In other words, a terminal that has received the PDSCH to HARQ timing indicator K1 through DCI of PDCCH810 may transmit PUCCH 870 in slot i + K1850 after K1 of reception slot 805 from PDSCH 840. In this case, the uplink control channel region may be composed of information of time domain 874 and frequency domain 872.

The base station may configure the terminal with one or more values K1 through higher layer signaling, or as described above, the base station may indicate a specific value K1 to the terminal through DCI. The value K1 may be determined according to the HARQ-ACK processing capability of the terminal, in other words, the value K1 is determined according to the shortest time required for the terminal to receive the PDSCH and to create and report HARQ-ACK for the PDSCH. Further, the terminal may use a predefined value or a default value as the value K1 until the terminal is configured with the value K1.

In this case, the PUCCH 870 transmission resource in the PUCCH transmission slot 850 may be indicated by the PUCCH resource indicator of the DCI, and the terminal may perform PUCCH transmission on the indicated resource. In this case, if transmission of a plurality of PUCCHs is configured or indicated in the PUCCH transmission slot 850, the terminal may perform PUCCH transmission on PUCCH resources other than the resources indicated by the PUCCH resource indicator of DCI of the PDCCH 810.

In a 5G communication system, in order to dynamically change an interval of downlink signal transmission and uplink signal transmission in a Time Division Duplex (TDD) system, whether a corresponding OFDM symbol constituting one slot is a downlink symbol, an uplink symbol, or a flexible symbol may be indicated by a Slot Format Indicator (SFI). Herein, the symbol indicated as a flexible symbol may not be a downlink and uplink symbol, or may not be a symbol that can be changed to a downlink or uplink symbol by UE-specific control information or scheduling information. In this case, the flexible symbol may include gap protection necessary in the process of changing from downlink to uplink.

The slot format indicator may be transmitted to a plurality of terminals simultaneously through a terminal group (or cell) common control channel. In other words, the slot format indicator may be transmitted on a PDCCH that is CRC-scrambled with an identifier (e.g., SF-RNTI) different from a terminal unique identifier (C-RNTI). In various embodiments, the slot format indicator may include information about N slots, and the value N may be an integer or a natural number greater than 0, or the value N may be a value that the base station configures the terminal with a higher signal in a predefined set of possible values (such as 1,2, 5, 10, and 20). In addition, the size of the slot format indicator information may be configured by the base station to the terminal through a higher signal. An example of a slot format that may be indicated by the slot format indicator is shown in table 3.

TABLE 3

In table 3, D denotes a downlink, U denotes an uplink, and F denotes a flexible symbol. According to table 3, the total number of slot formats that can be supported is 256. In the current NR system, the maximum size of the slot format indicator information bit is 128 bits, and the slot format indicator information bit is a value (e.g., dci-PayloadSize) that the base station can configure to the terminal through a higher signal.

In various embodiments, the slot format indicator information may include slot formats of a plurality of serving cells, and the slot formats of the respective serving cells may be distinguished from each other by serving cell IDs. Further, for each serving cell, a slot format combination of slot format indicators for one or more slots may be included. For example, if the size of the slot format indicator information bit is 3 bits and the slot format indicator information is composed of the slot format indicators of one serving cell, the 3-bit slot format indicator information may be composed of 8 slot format indicators or slot formation indicator combinations (hereinafter, referred to as slot format indicators) in total, and the base station may indicate one of eight slot format indicators through terminal group common control information (group common DCI) (hereinafter, referred to as slot format indicator information).

In various embodiments, at least one of the 8 slot format indicators may consist of a slot format indicator for a plurality of slots. For example, table 4 shows an example of 3-bit slot format indicator information consisting of the slot formats of table 3. Five slot format indicators (slot format combination IDs 0,1, 2,3, and 4) of the slot format indicator information may be slot format indicators of one slot, and the remaining three slot format indicators may be information on slot formation indicators (slot format combination IDs 5, 6, and 7) of four slots, and they may be sequentially applied to four slots.

TABLE 4

Time slot format combination ID	Time slot format
		0	0
1	1
		2	2
3	19
		4	9
5	0 0 0 0
		6	1 1 1 1
7	2 2 2 2

The terminal may receive configuration information of the PDCCH for detecting the slot format indicator information through a higher signal, and the terminal may detect the slot format indicator according to the configuration. For example, the terminal may be configured with at least one of: CORESET configuration for detecting slot format indicator information, search space configuration, RNTI information for CRC scrambling of DCI transmitting slot format indicator information, search space period, and offset information.

Fig. 9A illustrates channel occupancy time in a wireless communication system according to an embodiment of the present disclosure.

Fig. 9A illustrates a case in which PDCCH regions 920, 922, and 924 in which the terminal should detect slot format indicator information are provided, and the periodicity of the PDCCH regions is 2 slots. In other words, the terminal may detect DCI in PDCCH regions 920, 922, and 924 (or CORESET) in slot n 900, slot n + 2902, and slot n + 4904, which is CRC-scrambled with a slot format indicator identifier (e.g., SFI-RNTI or new RNTI), according to the configured PDCCH region and its period, and may acquire the slot format indicators for two slots through the detected DCI. In this case, the detected DCI may include slot format indicator information for two or more slots and for how many slots of its slot format indicator included in the DCI may be configured by higher signals. The configuration information on the slot format indicator for how many slots included in the DCI may be included in a higher signal equal to a higher signal for configuring the slot format indicator information.

Referring to fig. 9A, a terminal may acquire slot formation indicator information 910 and 911 for slot n 900 and slot n + 1901 in a PDCCH region 920 for slot n 900. Similarly, the terminal may obtain slot formation indicator information 912 and 913 for slot n + 2902 and slot n + 3903 in PDCCH region 922 for slot n + 2902. In this case, the slot formation indicator information 910, 911, 912, 913, and 914 may have at least one value in the format of table 3. In this case, there may be a new format in addition to the format of table 3.

If the base station transmits slot format indicator information in the unlicensed frequency band, in particular, if the slot format indicator information includes slot format indicators for a plurality of slots, the base station may not be able to determine the slot format indicator information for at least one slot according to whether a channel of the unlicensed frequency band is accessed. When slot format indicator information 914 and 915 for slot n + 4904 and slot n + 5905 are transmitted on PDCCH 924, the base station needs to determine how to indicate the slot format indicator information for slot n + 5905. For example, the base station may indicate that the slot format indicator is flexible for times other than the channel occupancy time.

Hereinafter, a method of allocating uplink resources will be explained. Uplink resources for transmitting signals or data may be allocated continuously or discontinuously, and if a specific resource allocation type is determined, information indicating the uplink resource allocation is interpreted according to the specific resource allocation type.

-uplink resource allocation type 0

The uplink resource allocation type 0 scheme is a resource allocation scheme in units of Resource Block Groups (RBGs), each of which is composed of P consecutive Resource Blocks (RBs). In this case, the size P of the RBG may be configured to one of configuration 1 and configuration 2 by a higher signal (e.g., RBG-size value of pusch-Config), and P may be determined based on the information and the size of the enabled uplink bandwidth part, as in table 5. Table 5 is a table indicating the size of the bandwidth part and the size of P according to the RBG configuration value. In this case, the size of the bandwidth part corresponds to the number of PRBs constituting the bandwidth part.

TABLE 5

Carrier bandwidth part size	Configuration 2
		1-36	4
37-72	8
		73-144	16
145-275	16

Uplink bandwidth part N_BWPCan be determined as the total number N of RBGs_RBG＝ceiling(N_BWP ^size+N_BWP ^startmod P)/P). Here, the first RBG₀Is P-N_BWP ^startmod P. If (N)_BWP ^start+N_BWP ^size) mod P is larger than 0, then the last RBG_lastBecomes (N)_BWP ^start+N_BWP ^size) mod P, and if (N)_BWP ^start+N_BWP ^size) mod P is not greater than 0, then the last RBG_lastBecomes P. The sizes of the remaining RBGs except the first and last RBGs become P. In this case, N_BWP ^startRepresenting BWP relative to CRB₀CRB of start, and N_BWP ^startIt can be understood as the point where a particular BWP starts in the CRB. N is a radical of_BWP ^sizeIndicating the number of RBs included in the BWP. In this case, the length (or size or number of bits) of the frequency resource allocation information is equal to N_RBGAnd may configure or schedule the terminal using the resources on which to schedule the terminal by N_RBGA bitmap of bits configures or schedules uplink transmissions for each RBG in RBG units. For example, the terminal may determine that the RBG region configured to 1 in the bitmap is a resource allocated for uplink transmission, and the terminal may determine that the RBG region configured to 0 is not a resource allocated for uplink transmission. In this case, the RBG bitmaps are sequentially (in ascending order) aligned and mapped on the axis of increasing frequency. In this way, consecutive or non-consecutive RBGs can be allocated for uplink transmission.

-uplink resource allocation type 1

The uplink resource allocation type 1 scheme is a contiguous frequency resource allocation scheme within an enabled uplink bandwidth portion. The frequency resource allocation information of the uplink resource allocation type 1 scheme may be indicated to the terminal by a Resource Indication Value (RIV). Length (or size or number of bits) and ceiling (log) of frequency resource allocation information₂(N_BWP(N_BWP+1)/2) are the same. RIV indicates frequency resource allocation start RB_startAnd L RB L allocated consecutively_RBs。

If the number of the first and second antennas is greater than the predetermined number,then RIV is equal to N_BWP(L_RBs-1)+RB_start

Otherwise, RIV ═ N_BWP(N_BWP-L_RBs+1)+(N_BWP-1-RB_s，tart)

Wherein L is_RBsNot less than 1 and not more than N_BWP-RB_start。

Here, N_BWPIs the size of the enabled uplink bandwidth part, and N_BWPExpressed in number of PRBs. RB (radio B)_startFirst PRB for starting uplink resource allocation, and L_RBsIs the length or number of consecutive PRBs. In this case, if one of DCI configuring or scheduling uplink transmission (hereinafter, referred to as UL grant), for example, DCI format 0_0, is transmitted in a Common Search Space (CSS), size N of the initial bandwidth part is used_BWP，0。

Also, in case of one DCI format of the UL grant (e.g., DCI format 0_0 transmitted from UE-specific common search space (USS)), the size or number of bits of frequency resource allocation information of the UL grant is determined as the initial bandwidth part N_{initial，BWP}But in case of DCI for UL grant scheduling another enabled bandwidth part, the RIV value is RB_start＝0、K、2K、...、(N_{initial，BWP}-1). K and L_RBs＝K、2K、...、N_{initial，BWP}K, and their configuration is as follows.

If the number of the first and second antennas is greater than the predetermined number,then RIV is equal to N_{initial，BWP}(L′_RBs-1)+RB′_start

Otherwise, RIV ═ N_{initial，BWP}(N_{initial，BWP}-L′_RBs+1)+(N_{initial，BWP}-1-RB′_start)

Wherein the content of the first and second substances,and wherein L'_RBsShould not exceed N_{initial，BWP}-RB′_start。

In this case, the bandwidth in the other enabled bandwidth part is N_active，BWPState (2) N_active，BWP＞N_{initial，BWP}In the case of (A), K is satisfiedOtherwise, K becomes K ═ 1.

-uplink resource allocation type 2

The uplink resource allocation type 2 scheme is an allocation scheme that distributes uplink signal or channel transmission frequency resources over the entire enabled uplink bandwidth portion and is characterized in that distances or intervals between allocated frequency resources are equal or comparable to each other. According to uplink resource allocation type 2, resource allocation is uniformly distributed over the entire frequency band, and thus uplink resource allocation type 2 can be limitedly applied in the case of transmitting an uplink signal or channel transmitted in a carrier, cell, or bandwidth part operating in an unlicensed frequency band that should satisfy frequency allocation requirements, such as Power Spectral Density (PSD) requirements or Occupied Channel Bandwidth (OCB) conditions.

Referring to fig. 9B, an uplink resource allocation type 2 scheme will be described as follows.

Fig. 9B illustrates a case where a terminal is configured to perform uplink signal transmission/reception with a base station through a bandwidth part 950 and the terminal is scheduled with uplink data channel transmission through an uplink resource allocation type 2, and it is assumed that the bandwidth part 950 is composed of 51 PRBs, according to an embodiment of the present disclosure. According to the uplink resource allocation type 2, 51 PRBs may constitute L (in the case of fig. 9B, L ═ 5) resource region sets, and each resource region set may be composed ofAnd each PRB consists of one PRB. In the case of fig. 9B, the first resource region set 930 is composed of 11 PRBs (# i, # i +5, # i +10, # i +15, # i., # i +45, # i +50), and the remaining resource region set, for example, the fourth resource region set 940 is composed of 10 PRBs (# i +3, # i +8, # i +13, # i +)18. ..., # i + 48). In other words, the number of PRBs included in the resource area set may be different according to the size of the bandwidth part or the number of PRBs of the bandwidth part. The terminal may be allocated with one or more resource region sets configured as above, or the terminal may be allocated with a continuous resource region set (e.g., resource region sets #0, #1 or #2, #3, and #4) through a method similar to uplink resource allocation type 1 (e.g., RIV value-based allocation), or the terminal may be allocated with a continuous or non-continuous resource region set similar to uplink resource allocation type 0 (e.g., bitmap-based allocation).

For example, in the case where the terminal is allocated with a continuous resource allocation region set in a similar manner to the uplink resource allocation type 1, if there are N resource region sets, the terminal may allocate a starting resource region set RB by indicating frequency resources_startAnd Resource Indication Values (RIVs) of L consecutive resource region sets to determine an allocated frequency resource region (or an allocated resource region set), and in this case, the RIV values are as follows.

If it is notThen RIV ═ N (L-1) + RB_start

Otherwise, RIV ═ N (N-L +1) + (N-1-RB_start)

For example, in case of RIV ═ 0, this means the first resource region set or resource region set #0 and in this case one resource region set consisting of PRBs # i, # i +10, # i +20, #., # i +50 of fig. 9B. In this case, the length (or size or number of bits) of the frequency resource allocation information may be ceiling (log)₂(N(N+1)/2)。

As another example, in the case where a contiguous or non-contiguous resource region set is allocated using a bitmap, an L-bit bitmap indicating L resource region sets constituting the bandwidth part 950 in an ascending order of frequency resources or in an ascending order of resource region set indexes may be configured, and the resource region sets may be allocated by the bitmap. For example, in the case of fig. 9B, the location of the resource region set may be indicated by a bitmap composed of 5 bits, and the bitmap 10000 indicates that the first resource region set, i.e., one composed of PRBs # i, # i +10, # i +20, # i., # i +50 in fig. 9B, is allocated. Bitmap 00010 indicates allocation of a fourth resource region set, i.e., PRBs # i +3, # i +8, # i +13, # i +18, #., # i +48 in fig. 9B. In this case, the length (or size or number of bits) of the frequency resource allocation information may be L.

-uplink resource allocation type 3

Fig. 9C is a diagram illustrating an uplink resource allocation type 3 according to an embodiment of the present disclosure.

Referring to fig. 9C, the uplink resource allocation type 3 scheme is an allocation scheme such that uplink signal or channel transmission frequency resources are distributed over the entire enabled uplink bandwidth section, and is characterized in that resource groups (or allocated resource blocks or allocated resource clusters) (e.g., 951 or 961) which are allocations of consecutive resources are completely distributed within the bandwidth section (e.g., 951, 952 and 953 and 961, 962 and 963) by an iterative transmission scheme or the like. That is, the resource group 951, which is an allocation of continuous resources, may iteratively exist among frequency resources (such as 951, 952, 953), and accordingly, a plurality of allocated resource groups may exist in a bandwidth portion. According to the uplink resource allocation type 3, resource groups (or blocks or clusters) which are continuously allocated are distributed in a frequency band, and thus the uplink resource allocation type 3 can be limitedly applied in the case of transmitting an uplink signal or channel transmitted in a carrier, cell or bandwidth part which operates in an unlicensed frequency band which should satisfy frequency allocation requirements such as Power Spectral Density (PSD) requirements or Occupied Channel Bandwidth (OCB) conditions.

In the case where a base station and a terminal support multiple frequency resource allocation schemes (i.e., in the case where the terminal is predefined or configured to use multiple frequency resource allocation schemes), it is necessary to provide a method of correctly determining a frequency resource allocation scheme that should be employed during uplink signal or channel transmission. Accordingly, in the present disclosure, a method by a terminal for determining a frequency resource allocation scheme during uplink signal or channel transmission of the terminal is proposed.

Hereinafter, in various embodiments of the present disclosure, for convenience of explanation, an uplink resource allocation scheme is divided into two schemes, a first scheme and a second scheme. Here, the first scheme refers to a scheme in which uplink signal transmission resources are continuously allocated on a frequency axis, such as an uplink resource allocation type 1 scheme. The second scheme refers to a resource allocation scheme of a type in which uplink signal transmission resources are uniformly distributed in a bandwidth part at equal intervals on a frequency axis, such as an uplink resource allocation type 2 scheme. In this case, an expression of the uplink resource allocation type 1 as the first scheme and an expression of the uplink resource allocation type 2 as the second scheme are merely exemplary, and a resource allocation scheme modified based on the types 1 and 2 may also be expressed as the first scheme and the second scheme. For example, the uplink resource allocation type 3 or 4 may be included in the first scheme and the second scheme (preferably, the type 3 or 4 may be included in the second scheme). In this case, the resource allocation type 2 or 4 may also be classified as the third scheme.

Further, if the uplink resource allocation scheme is configured to a specific uplink resource allocation type, the base station may create uplink resource allocation information according to the specific uplink resource allocation type, and the terminal may interpret the uplink resource allocation information according to the specific type. Hereinafter, a technique of configuring a specific uplink resource allocation scheme may refer to a base station creating uplink resource allocation information according to a specific uplink resource allocation type (or according to a resource allocation scheme modified based on the specific uplink resource allocation type) to transmit the created uplink resource allocation information as a higher signal or UL grant (DCI), and a terminal interpreting the uplink resource allocation information transmitted to the higher signal or UL grant (DCI) according to the specific uplink resource allocation type (or according to a resource allocation scheme modified based on the specific uplink resource allocation type) to identify allocated uplink resources.

[ first embodiment ]

In the present embodiment, a method is proposed in which a base station and a terminal support a plurality of frequency resource allocation schemes, and the terminal determines a random access preamble (hereinafter, referred to as a preamble or a Physical Random Access Channel (PRACH)) transmission frequency resource allocation scheme or a frequency resource region (hereinafter, referred to as a frequency resource allocation scheme).

In this embodiment, the base station may receive information about functions or capabilities supportable by the terminal and including a frequency resource allocation scheme of a preamble that the terminal can support at least, from the terminal, and through the information, the base station may determine the frequency resource allocation scheme of the preamble that the terminal can support. Thereafter, the base station may indicate or configure one or more preamble frequency resource allocation schemes to the terminal, so that the terminal supporting the plurality of frequency resource allocation schemes may transmit the preamble according to the frequency resource allocation scheme supported by the base station or the frequency resource allocation scheme that the base station intends to receive from the terminal. Meanwhile, in an embodiment of the present disclosure, a higher signal or system information configuration method for indicating or configuring a preamble resource allocation scheme (e.g., enabling/disabling, enumerating, and selecting) is merely exemplary, and the present disclosure is not limited thereto.

Further, in the present disclosure, a method for indicating or configuring a preamble frequency resource allocation scheme to a terminal will be described, but a preamble frequency resource region may also be indicated or configured to a terminal by a base station, and the terminal determines the preamble frequency resource allocation scheme according to the frequency resource region. In this case, the preamble frequency resource allocation scheme applied to the specific frequency resource region may be predetermined, or the preamble frequency resource allocation scheme applied to the specific frequency resource region may be configured by the base station.

Method 1-1: configuring preamble transmission frequency resource allocation scheme by system information or higher signal

Hereinafter, the method 1-1 will be described in more detail. Method 1-1 is a method in which a base station indicates or configures a preamble transmission frequency resource allocation scheme to a terminal through system information or a higher signal. Since the preamble transmission frequency resource allocation scheme is indicated or configured by the system information, all terminals can transmit the preamble by the same frequency resource allocation scheme in a bandwidth part in which the preamble is transmitted. In this case, the preamble transmission frequency resource allocation scheme may be included in random access-related configuration information (e.g., rach-configcommon or prach-configuration index) to be transmitted to the terminal. In this case, a default preamble transmission frequency resource allocation scheme between the base station and the terminal may be predefined. For example, the first scheme may be a default preamble transmission frequency allocation scheme (e.g., a scheme in which preambles are transmitted through K consecutive PRBs), and a scheme other than the first scheme (e.g., a frequency resource allocation scheme of the second scheme) may be enabled by system information. If the frequency resource allocation scheme of the second scheme is enabled, the terminal determines the second scheme as a preamble transmission frequency resource allocation scheme. In this case, if the frequency resource allocation scheme of the second scheme is enabled, the terminal may possibly determine both the first scheme and the second scheme as the preamble transmission frequency resource allocation scheme, and in this case, the transmission frequency resource allocation scheme that the terminal should use during preamble transmission may be determined by at least one of the methods 1-2 and 1-3 proposed in embodiment 1.

Meanwhile, the frequency resource region in which the preamble can be transmitted may be frequency-multiplexed by a higher signal (e.g., the minimum PRB index, the minimum frequency, or msg1-frequency start of the frequency resource region in which the preamble can be transmitted), the preamble frequency multiplexing number n_RAE {0, 1., M-1} (where M is a value configured as a higher signal (e.g., msg1-FDM)), and time domain resource information (e.g., prach-ConfigurationIndex) of a transmittable preamble.

As another example, the base station may specify and configure at least one of the uplink resource allocation schemes to the terminal through the system information. For example, the base station may designate the terminal to use one of the first scheme or the second scheme, or one of the first scheme and the second scheme as the preamble resource allocation scheme. If both the first scheme and the second scheme are used for preamble transmission frequency resource allocation, the terminal can determine a transmission frequency resource allocation scheme that should be used during preamble transmission through at least one of the methods 1-2 and 1-3 proposed in embodiment 1.

Method 1-2: determining a preamble transmission frequency resource allocation scheme depending on whether a preamble is transmitted within a channel occupancy time of a base station

Hereinafter, the methods 1 to 2 will be described in more detail. The method 1-2 is characterized in that if the preamble transmission frequency resource allocation scheme is configured by the method 1-1, the preamble transmission frequency resource allocation scheme may be different depending on whether the preamble is transmitted within a channel occupying time of the base station. Thus, the preamble transmission frequency resource allocation schemes may be the same as or different from each other depending on whether the preamble is transmitted within the channel occupying time of the base station.

Preferably, after performing the channel access procedure, the base station controls uplink signal transmission of the terminal for a channel occupation time of the channel accessed and used by the base station. For example, the base station may transmit DCI indicating preamble transmission to at least one terminal on a downlink control channel, and the terminal having received the DCI may transmit a preamble according to the DCI. Further, the base station may instruct transmission of an uplink control channel (PUCCH) and a data channel (PUSCH) to the terminal, and may multiplex the uplink signal and the channel. Accordingly, the base station needs to efficiently multiplex the uplink signal and the channel transmitted by the terminal in at least one slot or transmission time interval by having the same resource allocation scheme for the uplink signal and the channel at least in the channel occupying time. Accordingly, in the present disclosure, a method is provided in which a preamble transmission frequency resource allocation scheme is independently configured depending on whether at least a preamble is transmitted within a channel occupancy time of a base station.

For example, the terminal may be configured with a transmission resource allocation scheme (e.g., a first scheme) in the case where the preamble is transmitted within the channel occupying time of the base station, and a transmission resource allocation scheme (e.g., a second scheme) in the case where the preamble is transmitted through system information or a higher signal from the base station in a time other than the channel occupying time of the base station. Further, a transmission resource allocation scheme in the case where the preamble is transmitted in a time other than the channel occupying time of the base station may be predefined (e.g., a default resource allocation scheme) between the base station and the terminal, and the transmission resource allocation scheme (e.g., the first scheme) in the case where the preamble is transmitted within the channel occupying time of the base station may be configured or enabled by the base station through system information or a higher signal. Similarly, a transmission resource allocation scheme in the case where a preamble is transmitted within a channel occupying time of a base station may be predefined (e.g., a default resource allocation scheme) between the base station and a terminal, and a transmission resource allocation scheme in the case where a preamble is transmitted in a time other than the channel occupying time of the base station (e.g., a first scheme) may be configured or enabled by the base station through system information or a higher signal. Further, if the terminal is not configured with a transmission resource allocation scheme in the case of transmitting a preamble within the channel occupying time of the base station or if the transmission resource allocation scheme is not enabled, the terminal may apply the transmission resource allocation scheme in the case of transmitting a preamble in a time other than the channel occupying time of the base station even to the case of transmitting a preamble within the channel occupying time of the base station.

Similarly, a transmission resource allocation scheme in the case where a preamble is transmitted within a channel occupying time of a base station may be predefined (e.g., a default resource allocation scheme) between the base station and a terminal, and a transmission resource allocation scheme in the case where a preamble is transmitted in a time other than the channel occupying time of the base station (e.g., a first scheme) may be configured or enabled by the base station through system information or a higher signal. In this case, if the terminal is not configured with a transmission resource allocation scheme in the case of transmitting the preamble in a time other than the channel occupying time of the base station, or if the scheme is not enabled, the terminal may apply the transmission resource allocation scheme in the case of transmitting the preamble within the channel occupying time of the base station even to the case of transmitting the preamble within the channel occupying time of the base station.

As described above, a terminal having determined a transmission resource allocation scheme (e.g., a first scheme) in the case of transmitting a preamble within a channel occupying time of a base station and a transmission resource allocation scheme (e.g., a second scheme) in the case of transmitting a preamble in a time other than the channel occupying time of the base station can determine whether a preamble transmission time or a transmission slot is a time (or slot) within the channel occupying time of the base station or a time (or slot) other than the channel occupying time, and the terminal can transmit the preamble through a correct transmission resource allocation scheme according to the result of the determination. In this case, the terminal may determine whether the base station occupies the channel or whether the base station accesses the channel depending on whether a reference signal (e.g., DMRS) transmitted by the base station is detected, or the terminal may determine whether the base station occupies the channel by receiving information on whether the base station accesses the channel or information on a channel occupancy time of the base station transmitted through a downlink control channel by the base station.

In this case, the information on whether the base station accesses the channel or the information on the channel occupying time may be composed of not only information on at least one bandwidth part and one transmission interval or slot but also information on at least one of a plurality of bandwidth parts and a plurality of slots. Further, the information on whether the base station accesses the channel or the information on the channel occupying time may be composed of: information on one or more sub-band units having a size smaller than that of the bandwidth part, or information on one or more micro-slots or transmission time intervals or symbols composed of symbols smaller than the symbols. For example, as shown in fig. 9A, in the case where the base station transmits a signal by accessing the unlicensed band channel after performing a channel access procedure, the base station may transmit a channel occupying time, slot format indicator information 910, 911, 912, 913, and 914 within the channel occupying time, or other information (e.g., a channel occupying start time and a channel occupying end time) capable of determining this to the terminal through the PDCCH. The terminal having received the information may determine whether to transmit the preamble within the determined channel occupying time of the base station, and the terminal may transmit the preamble according to the method 1-2 according to the result of the determination.

Methods 1 to 3: determining a frequency resource allocation scheme through DCI indicating preamble transmission

Hereinafter, the methods 1 to 3 will be described in more detail. The method 1-3 is a method in which if a transmission frequency resource allocation scheme of a preamble is configured by the method 1-1 or the like, the preamble transmission frequency resource allocation scheme is independently configured depending on whether the preamble is transmitted by an instruction of a base station or transmitted without an instruction of any separate base station according to a determination of a terminal. Thus, the preamble transmission frequency resource allocation schemes may be identical to or different from each other according to a case where the preamble is transmitted by an instruction of the base station (or in a case where the preamble is transmitted in a contention-free random access procedure) or according to a case where the terminal determines that there is no separate base station instructing to transmit the preamble (or in a case where the preamble is transmitted in a contention-based random access procedure).

Here, the case where the preamble is transmitted by the instruction of the base station or the contention-free random access procedure refers to the case where the terminal, which has received DCI scrambled by the CRC with the RA-RNTI among DCI transmitted on the downlink control channel, transmits the preamble according to the DCI configuration or the instruction information. Meanwhile, the case of transmitting the preamble according to the determination of the terminal without the indication of the base station or the contention-based random access procedure refers to the case where the terminal transmits the preamble for the purpose of uplink data transmission resource request if the terminal transmits the preamble to initially access the cell or if the terminal cannot be allocated resources for transmitting uplink data from the base station.

Therefore, in the case of transmitting a preamble according to the instruction of the base station, the terminal, which has received DCI CRC-scrambled with RA-RNTI, for example, among DCI transmitted on a downlink control channel, transmits the preamble according to information indicated or configured by the DCI by the base station. In the above case, the base station may instruct one or more terminals to transmit an uplink control channel (PUCCH) or a data channel (PUSCH) during a time or slot in which the preamble is transmitted, so that uplink signals and channels may be multiplexed. Therefore, the base station needs to efficiently multiplex the uplink signal and the channel transmitted by the terminal in the transmission interval or slot in which the base station instructs the preamble transmission by having the uplink signal and the channel transmitted by the terminal have the same resource allocation scheme. Accordingly, in the present disclosure, a method is provided in which a preamble transmission frequency resource allocation scheme may be independently configured depending on whether a preamble is transmitted according to an instruction of a base station.

For example, the terminal may be configured with a transmission resource allocation scheme (e.g., a first scheme) in case of transmitting the preamble according to an instruction of the base station and a transmission resource allocation scheme (e.g., a second scheme) in case of transmitting the preamble according to a determination that the terminal transmits the preamble through system information or a higher signal from the base station. In this case, a transmission resource allocation scheme in the case of transmitting a preamble according to an instruction of the base station may be predefined (e.g., a default resource allocation scheme) between the base station and the terminal, and the transmission resource allocation scheme (e.g., the first scheme) in the case of transmitting the preamble according to a determination of the terminal may be configured or initiated by the base station through system information or a higher signal. In this case, if the terminal is not configured with the transmission resource allocation scheme in the case of transmitting the preamble according to the determination of the terminal or the scheme is not enabled, the terminal may apply the transmission resource allocation scheme in the case of transmitting the preamble according to the instruction of the base station even to the case of transmitting the preamble according to the determination of the terminal. Similarly, a transmission resource allocation scheme in the case of transmitting a preamble according to the determination of the terminal may be predefined (e.g., a default resource allocation scheme) between the base station and the terminal, and a transmission resource allocation scheme (e.g., a first scheme) in the case of transmitting a preamble according to the indication of the base station may also be configured or enabled by the base station through system information or a higher signal. Further, if the terminal is not configured with a transmission resource allocation scheme in the case of transmitting a preamble according to an instruction of the base station or if the scheme is not enabled, the terminal may even apply the transmission resource allocation scheme in the case of transmitting a preamble according to a determination of the terminal to the above-described case.

In this case, if the preamble is transmitted according to the instruction of the base station, the transmission resource allocation scheme of the preamble may also be determined by information in DCI instructing the preamble transmission. For example, the transmission resource allocation scheme of the preamble may be indicated or configured by at least one field (e.g., a transmission resource allocation scheme identifier) in the DCI CRC-scrambled with the RA-RNTI. In this case, the transmission resource allocation scheme identifier may be added as a new field, or at least one bit of a pre-existing field may be used or configured as the transmission resource allocation scheme identifier. For example, the transmission resource allocation scheme of the preamble may be indicated or configured by one MSB bit in the frequency axis resource allocation field.

Meanwhile, since it is apparent that the methods 1-3 are considered together not only in determining the transmission resource allocation scheme of the preamble using the methods 1-2, but also the methods 1-2 are considered together in determining the transmission resource allocation scheme of the preamble using the methods 1-3, detailed description thereof will be omitted.

[ second embodiment ]

In this embodiment, a method for supporting multiple frequency resource allocation schemes by a base station and a terminal is provided. According to this method, a terminal transmits a random access preamble, and if a random access response (hereinafter, referred to as RAR or RAR UL grant) is received from a base station as one of corresponding response signals, the terminal determines a transmission frequency resource allocation scheme of an uplink data channel scheduled through RAR.

The base station transmits DCI CRC-scrambled with RA-RNTI to the terminal on a downlink control channel in response to the preamble transmitted by the terminal. The terminal having received the DCI receives the PDSCH according to information indicated or scheduled by the DCI. An RAR MAC PDU is transmitted from a base station to a terminal through a PDSCH, and the terminal identifies a Random Access Preamble Identification (RAPID) transmitted from the base station to the terminal in the RAR MAC PDU. In this case, the RAPID is a value that the terminal creates from a preamble transmitted in advance, and thus the terminal can identify that the received RAPID is the RAPID of the terminal by comparing the RAPID of the preamble transmitted by the terminal itself with the received RAPID. If it is identified that the received RAPID is a RAPID of the terminal, the terminal transmits an uplink data channel to the base station according to information indicated or scheduled by a UL grant included in the RAR MAC PDU. Table 6 is a table indicating the RAR UL grant field and its size.

TABLE 6

RAR UL grant field	Number of bits
		Frequency hopping sign	1
PUSCH frequency resource allocation	14
		PUSCH time resource allocation	4
MCS	4
		TPC command of PUSCH	3
CSI request	1

In this embodiment, a method for supporting multiple frequency resource allocation schemes by a base station and a terminal is provided. According to the method, a terminal transmits a random access preamble, and if a random access response (hereinafter, referred to as RAR or RAR UL grant) is received from a base station as one of corresponding response signals, the terminal determines a transmission frequency resource allocation scheme of an uplink data channel (or msg3) scheduled through the RAR.

Method 2-1: using the same resource allocation scheme as the preamble resource allocation scheme

Method 2-1 is a method in which a terminal determines a transmission frequency resource allocation scheme of an uplink data channel scheduled by RAR to be the same as a preamble resource allocation scheme indicated or determined by one or more of various methods according to embodiment 1 of the present disclosure. The advantage of method 2-1 is that no additional information is required for indicating or configuring the transmission frequency resource allocation scheme of the uplink data channel scheduled by the RAR.

Method 2-2: determining a resource allocation scheme according to a waveform configuration of an uplink data channel scheduled by RAR

Hereinafter, the method 2-2 will be described in more detail. In a 5G system such as NR, a terminal may use various uplink transmission waveforms. For example, in the case of an NR system, a terminal may support a CP-OFDM based uplink signal waveform and a DFT-s-OFDM based uplink signal waveform, and one of the waveforms may be configured to be used from a base station, or both of the waveforms may be used. Further, different waveforms may be defined in advance according to a transmission signal or a channel to be used, or may be configured by a higher signal. For example, the terminal may determine the waveform of the uplink data channel through an Information Element (IE) of system information, such as msg 3-transformdredor of RACH-ConfigCommon. For example, if msg 3-transformdredor is enabled, the terminal may determine that the waveform of the uplink data channel is a DFT-s-OFDM based waveform, and the terminal may transmit the uplink data channel using the determined waveform. In this case, if the msg 3-transformdredor is disabled or a field does not exist, the terminal may determine that the waveform of the uplink data channel is a CP-OFDM based waveform, and the terminal may transmit the uplink data channel using the determined waveform.

In general, the DFT-s-OFDM waveform has a characteristic of low peak-to-average power ratio (PAPR) compared to the CP-OFDM waveform, and is more applicable in the case of using continuous resource allocation on the frequency axis, whereas in the case of the CP-OFDM waveform, the CP-OFDM waveform can be used for non-continuous resource allocation. Therefore, the resource allocation scheme of the uplink data channel can be determined according to the waveform configuration of the uplink data channel scheduled by the RAR. For example, if the waveform of the uplink data channel scheduled through the RAR is configured as a DFT-s-OFDM waveform, the terminal may determine that the resource allocation of the uplink data channel scheduled through the RAR corresponds to the first scheme (continuous resource allocation scheme). If the waveform of the uplink data channel scheduled through the RAR is configured as the CP-OFDM waveform, the terminal may determine that the resource allocation of the uplink data channel scheduled through the RAR corresponds to the second scheme (distributed resource allocation scheme).

Method 2-3: indicating resource allocation scheme by RAR UL grant

Method 2-3 is a method of determining a resource allocation scheme of an uplink data channel scheduled by RAR using at least one field value among fields included in the RAR UL grant.

For example, a field indicating a resource allocation scheme of an uplink data channel is introduced in the RAR UL grant, and the terminal may determine the resource allocation scheme of the uplink data channel scheduled through the RAR according to the field value. For example, a resource allocation type indicator of one bit size is added, and if a field value is 0, the field value may indicate that a resource allocation scheme of an uplink data channel scheduled through the RAR is a first scheme, and if the field value is 1, the field value may indicate that the resource allocation scheme of the uplink data channel scheduled through the RAR is a second scheme. In this case, the resource allocation scheme indicated by the name and size of the field and the bit value is only exemplary. In this case, in case that the terminal performs at least contention-free based random access, the CSI request field of the RAR UL grant is not used but is reserved, and thus a field may be used to indicate a resource allocation scheme of an uplink data channel scheduled through the RAR.

As another example, a resource allocation scheme of an uplink data channel scheduled by a frequency hopping flag field of the RAR UL grant may be determined. For example, if an uplink data channel scheduled through the RAR is transmitted in the unlicensed band cell, the flag field may be reinterpreted as information indicating a resource allocation scheme of the uplink data channel scheduled through the RAR, or the resource allocation scheme of the uplink data channel may be determined by replacing the flag field with a resource allocation type indicator according to a field value.

As yet another example, the resource allocation scheme of the uplink data channel may be determined according to a configuration value of a hopping flag field of the RAR UL grant. In case of the second scheme, frequency resources are uniformly distributed over the entire bandwidth part, and thus there is no need to frequency hop the uplink data channel allocated by the second scheme. Accordingly, if the frequency hopping is configured (e.g., if the flag field value is 1), the terminal may determine that the resource allocation of the uplink data channel scheduled through the RAR corresponds to the first scheme, and if the frequency hopping is not configured (e.g., if the flag field value is 0), the terminal may determine that the resource allocation of the uplink data channel scheduled through the RAR corresponds to the second scheme.

Method 2-4: determining a transmission frequency resource allocation scheme depending on whether an uplink data channel scheduled by RAR is transmitted within a channel occupancy time of a base station

Hereinafter, the methods 2 to 4 will be described in more detail. Method 2-4 is a method of determining a transmission frequency resource allocation scheme of an uplink data channel depending on whether the uplink data channel is transmitted within a channel occupancy time of a base station if the transmission frequency resource allocation scheme of the uplink data channel (hereinafter referred to as uplink data channel or msg3) scheduled by RAR is indicated or configured by at least one of method 2-1, method 2-2, and method 2-3. Thus, the transmission frequency resource allocation schemes of the uplink data channels may be the same as or different from each other depending on whether the uplink data channels are transmitted within the channel occupying time of the base station or transmitted in a time other than the channel occupying time of the base station. Accordingly, a transmission frequency resource allocation scheme of an uplink data channel (hereinafter referred to as an uplink data channel or smg3) may be the same as or different from a transmission frequency resource allocation scheme of an uplink data channel indicated or configured by at least one of method 2-1, method 2-2, and method 2-3.

Preferably, the base station controls uplink signal transmission of the terminal during a channel occupying time in which the base station accesses and uses the channel after performing the channel access procedure. For example, the base station may transmit DCI indicating preamble transmission to at least one terminal on a downlink control channel, and the terminal having received the DCI may transmit a preamble according to the DCI. Further, the base station may instruct to transmit an uplink control channel (PUCCH) or a data channel (PUSCH) to the terminal, and may multiplex the uplink signal and the channel. Accordingly, the base station needs to efficiently multiplex the uplink signal and the channel transmitted by the terminal in at least one slot or transmission time interval by having the same resource allocation scheme for the uplink signal and the channel at least in the channel occupying time. Therefore, a method of independently configuring a transmission frequency resource allocation scheme depending on whether at least an uplink data channel is transmitted within a channel occupying time of a base station is required.

For example, the terminal may transmit the uplink data channel using a transmission resource allocation scheme (e.g., a first scheme) in the case of transmitting the uplink data channel configured as the RAR UL grant within a channel occupying time of the base station and a transmission resource allocation scheme (e.g., a second scheme) in the case of transmitting the uplink data channel within a time other than the channel occupying time of the base station. In this case, a transmission resource allocation scheme in the case of transmitting an uplink data channel for a time other than the channel occupying time of the base station may be predefined (e.g., a default resource allocation scheme) between the base station and the terminal, and the transmission resource allocation scheme (e.g., the first scheme) in the case of transmitting the uplink data channel for the channel occupying time of the base station may be configured or enabled by the base station through system information or a higher signal or RAR UL grant. Similarly, a transmission resource allocation scheme in the case where an uplink data channel is transmitted within a channel occupying time of the base station may be predefined (e.g., a default resource allocation scheme) between the base station and the terminal, and a transmission resource allocation scheme (e.g., a first scheme) in the case where an uplink data channel is transmitted within a time other than the channel occupying time of the base station may be configured or enabled by the base station through system information or a higher signal or RAR UL grant. Further, a transmission resource allocation scheme (e.g., a second scheme) in the case of transmitting an uplink data channel for a time other than the channel occupying time of the base station may be configured by the RAR UL grant, and a transmission resource allocation scheme (e.g., a first scheme) in the case of transmitting an uplink data channel for the channel occupying time of the base station may be configured or enabled by the base station through system information or a higher signal. Similarly, a transmission resource allocation scheme (e.g., a first scheme) in the case where an uplink data channel is transmitted within a channel occupying time of the base station may be configured by the RAR UL grant, and a transmission resource allocation scheme (e.g., a second scheme) in the case where an uplink data channel is transmitted within a time other than the channel occupying time of the base station may be configured or enabled by the base station through system information or a higher signal.

Further, if the terminal is not configured with a transmission resource allocation scheme in the case of transmitting the uplink data channel within the channel occupying time of the base station, or if the transmission resource allocation scheme is not enabled, the terminal may apply the transmission resource allocation scheme in the case of transmitting the uplink data channel even within a time other than the channel occupying time of the base station to the case of transmitting the uplink data channel within the channel occupying time of the base station. Similarly, a transmission resource allocation scheme in the case where an uplink data channel is transmitted within a channel occupying time of the base station may be predefined (e.g., a default resource allocation scheme) between the base station and the terminal, and a transmission resource allocation scheme in the case where an uplink data channel is transmitted within a time other than the channel occupying time of the base station (e.g., a first scheme) may be configured or enabled by the base station through system information or a higher signal. In this case, if the terminal is not configured with a transmission resource allocation scheme in the case of transmitting the uplink data channel for a time other than the channel occupying time of the base station, or if the scheme is not enabled, the terminal may apply the transmission resource allocation scheme in the case of transmitting the uplink data channel for the channel occupying time of the base station even to the case of transmitting the uplink data channel for a time other than the channel occupying time of the base station.

As described above, the terminal may determine a transmission resource allocation scheme (e.g., a first scheme) in the case where the uplink data channel is transmitted within the channel occupying time of the base station and a transmission resource allocation scheme (e.g., a second scheme) in the case where the uplink data channel is transmitted within a time other than the channel occupying time of the base station, and the terminal may determine whether the uplink data channel transmission time or the transmission slot is a time within the channel occupying time of the base station or a time other than the channel occupying time, and the terminal may transmit the uplink data channel through a correct transmission resource allocation scheme according to the result of the determination. In this case, the terminal may determine whether the base station occupies the channel or whether the base station accesses the channel depending on whether a reference signal (e.g., DMRS) transmitted by the base station is detected, or the terminal may determine whether the base station occupies the channel by receiving information on whether the base station accesses the channel or information on a channel occupancy time of the base station transmitted through a downlink control channel by the base station.

[ third embodiment ]

In this embodiment, a method for a base station and a terminal to support multiple frequency resource allocation schemes is proposed. According to the method, a terminal receives DCI (hereinafter abbreviated UL grant) for scheduling uplink data channel transmission from a base station, and determines a transmission frequency resource allocation scheme of the uplink data channel in the case where the uplink data channel is transmitted accordingly.

Method 3-1: transmission frequency resource allocation scheme for configuring uplink data channel by system information or higher signal

Method 3-1 is a method of indicating or configuring a transmission frequency resource allocation scheme of an uplink data channel to a terminal. By indicating or configuring a transmission frequency resource allocation scheme of the uplink data channel by the system information, all terminals can transmit the uplink data channel in the same frequency resource allocation scheme in a bandwidth section in which the uplink data channel is transmitted. In this case, the transmission frequency resource allocation scheme of the uplink data channel may be included in uplink data channel-related configuration information (e.g., pusch-config) to be transmitted to the terminal. In this case, a default frequency allocation scheme between the base station and the terminal may be predefined. For example, the first scheme may be a transmission frequency resource allocation scheme of a default uplink data channel, and the base station may enable a frequency resource allocation scheme of a scheme other than the first scheme (e.g., a frequency resource allocation scheme of the second scheme) through system information or a higher signal. If a frequency resource allocation scheme (e.g., the second scheme) of a scheme other than the first scheme is not enabled by system information or a higher signal, in other words, if the frequency resource allocation scheme of the second scheme is disabled, the terminal may determine that the transmission frequency resource allocation scheme of the uplink data channel is the default frequency resource allocation scheme.

The above method can be applied not only to an uplink data channel scheduled by an UL grant but also to an uplink data channel transmission frequency resource allocation scheme of an uplink data channel scheduled without an UL grant. In the NR system, the uplink data channel scheduled without the UL grant as described above may be referred to as an uplink data channel configured by a configured UL transmission or a configured grant (or a configured scheduling), and a transmission frequency resource allocation scheme of the uplink data channel scheduled without the UL grant may be configured separately from a transmission frequency resource allocation scheme of the uplink data channel scheduled by the UL grant.

Method 3-2: determining a resource allocation scheme based on a waveform configuration of an uplink data channel

Hereinafter, the method 3-2 will be described in more detail. In a 5G system such as NR, a terminal may use various uplink transmission waveforms. For example, in the case of an NR system, a terminal may support a CP-OFDM based uplink signal waveform and a DFT-s-OFDM based uplink signal waveform, and one of the waveforms may be configured to be used from a base station, or both of the waveforms may be used. In addition, different waveforms may be predefined to be used according to transmission signals or channels.

For example, the terminal may determine the waveform of the uplink data channel through an Information Element (IE) of system information, such as msg 3-transformdredor of RACH-ConfigCommon. For example, if msg 3-transformdredor is enabled, the terminal may determine that the waveform of the uplink data channel is a DFT-s-OFDM based waveform, and the terminal may transmit the uplink data channel scheduled by the RAR UL grant. In this case, if the msg 3-transformdredor is disabled or a field does not exist, the terminal may determine that the waveform of the uplink data channel is a CP-OFDM based waveform, and the terminal may transmit the uplink data channel using the determined waveform. Similarly, the terminal may be additionally configured with a waveform of an uplink data channel other than the uplink data channel scheduled by the RAR UL grant, in other words, a waveform of an uplink data channel transmitted by DCI or UL grant scrambled with C-RNTI or CS-RNTI by a higher signal (e.g., transformprreceiver in pusch-Config and/or transformprreceiver in Config).

In general, the DFT-s-OFDM waveform has a characteristic of low peak-to-average power ratio (PAPR) compared to the CP-OFDM waveform, and is more applicable in the case of using continuous resource allocation on the frequency axis, whereas in the case of the CP-OFDM waveform, the CP-OFDM waveform can be used for non-continuous resource allocation. Accordingly, a resource allocation scheme of the uplink data channel may be determined according to a waveform configuration of the uplink data channel scheduled by the UL grant. For example, if the waveform of the uplink data channel scheduled by the UL grant is configured as a DFT-s-OFDM waveform, the terminal may determine that the resource allocation of the uplink data channel scheduled by the UL grant corresponds to the first scheme. If the waveform of the uplink data channel scheduled by the UL grant is configured as a CP-OFDM waveform, the terminal may determine that the resource allocation of the uplink data channel scheduled by the UL grant corresponds to the second scheme.

In addition, the resource allocation scheme of the uplink data channel may also be determined according to the UL grant format (i.e., DCI format) in which the uplink data channel is scheduled. For example, a resource allocation scheme of an uplink data channel scheduled by one of the UL grant formats for scheduling the uplink data channel (e.g., a UL grant for a scheduling fallback or default uplink data channel, such as DCI format 0_0) and a resource allocation scheme of an uplink data channel scheduled by the other of the UL grant formats for scheduling the uplink data channel (e.g., a UL grant for scheduling a general uplink data channel, such as DCI format 0_1) may be the same as or different from each other.

That is, the NR system will be explained as an example. The terminal may determine that an uplink data channel scheduled to format 0_0, which is one of UL grant formats for scheduling the uplink data channel, follows the first scheme, and an uplink data channel scheduled to format 0_1, which is one of UL grant formats for scheduling the uplink data channel, follows the second scheme. In this case, DCI formats 0_0 and 0_1 are merely exemplary, and the method can be applied even to another DCI format.

Method 3-3: indicating resource allocation scheme by RAR UL grant

Method 3-3 is a method of determining a resource allocation scheme of an uplink data channel scheduled by an UL grant using at least one field value among fields (i.e., DCI) included in the UL grant.

For example, a field indicating a resource allocation scheme of an uplink data channel is introduced in the UL grant, and the terminal may determine the resource allocation scheme of the scheduled uplink data channel according to the field value. For example, one resource allocation type indicator of one bit size may be separately added to the UL grant, or an indicator of one bit size may be added to a field indicating frequency axis resource allocation information, and if the field value is 0, the field value may indicate that a resource allocation scheme of an uplink data channel scheduled through the UL grant is a first scheme, and if the field value is 1, the field value may indicate that the resource allocation scheme of the uplink data channel scheduled through the UL grant is a second scheme. In this case, the resource allocation scheme indicated by the name and size of the field and the bit value is only exemplary. In addition, an indicator having a size of one bit or one row may be added to a field indicating time axis resource allocation information or a table corresponding thereto, thereby indicating a resource allocation scheme of an uplink data channel.

As another example, the terminal may determine a resource allocation scheme of an uplink data channel scheduled by a frequency hopping flag field of the UL grant. For example, if an uplink data channel scheduled by an UL grant is transmitted in the unlicensed band cell, the flag field may be reinterpreted as a resource allocation scheme of the uplink data channel scheduled by the UL grant, or the flag field may be replaced by a resource allocation type indicator according to the field value to determine the resource allocation scheme of the uplink data channel.

In addition, the terminal may determine a resource allocation scheme of the uplink data channel according to a configuration value of a hopping flag field of the UL grant. In the case of the second scheme, the frequency resources are evenly distributed over the entire bandwidth portion. Therefore, the uplink data channel allocated by the second scheme does not need to be frequency hopped. Accordingly, if frequency hopping is configured (e.g., if the flag field value is 1), the terminal may determine that the resource allocation of the uplink data channel scheduled by the UL grant corresponds to the first scheme, and if frequency hopping is not configured (e.g., if the flag field value is 0), the terminal may determine that the resource allocation of the uplink data channel scheduled by the UL grant corresponds to the second scheme.

Method 3-4: determining a transmission frequency resource allocation scheme depending on whether an uplink data channel scheduled by an UL grant is transmitted within a channel occupancy time of a base station

Hereinafter, the methods 3 to 4 will be described in more detail. Method 3-4 is a method of determining a transmission frequency resource allocation scheme of an uplink data channel depending on whether the uplink data channel is transmitted within a channel occupying time of a base station if the transmission frequency resource allocation scheme of the uplink data channel (hereinafter, referred to as an uplink data channel) scheduled by an UL grant is indicated or configured by at least one of method 3-1, method 3-2, and method 3-3. By this method, transmission frequency resource allocation schemes of uplink data channels may be identical to or different from each other depending on whether the uplink data channels are transmitted within or in a time other than a channel occupying time of the base station, and thus, the transmission frequency resource allocation schemes of the uplink data channels may be identical to or different from the transmission frequency resource allocation scheme of the uplink data channels indicated or configured by at least one of the methods 3-1, 3-2, and 3-3.

Preferably, the base station controls uplink signal transmission of the terminal during a channel occupying time in which the base station accesses and uses the channel after performing the channel access procedure. For example, the base station may transmit an UL grant on a downlink control channel to at least one terminal, and the terminal having received the UL grant may transmit an uplink data channel according to the UL grant. Further, the base station may instruct to transmit an uplink control channel (PUCCH) or a data channel (PUSCH) to one or more terminals, and may multiplex the uplink signal and the channel. Accordingly, the base station needs to efficiently multiplex the uplink signal and the channel transmitted by the terminal in at least one slot or transmission time interval by having the same resource allocation scheme for the uplink signal and the channel at least in the channel occupying time. Therefore, there is a need for a method of independently configuring a transmission frequency resource allocation scheme depending on whether at least an uplink data channel is transmitted within a channel occupying time of a base station.

For example, the terminal may transmit the uplink data channel using a transmission resource allocation scheme (e.g., a first scheme) in the case where the uplink data channel configured by the UL grant is transmitted within the channel occupying time of the base station and a transmission resource allocation scheme (e.g., a second scheme) in the case where the uplink data channel is transmitted within a time other than the channel occupying time of the base station. In this case, a transmission resource allocation scheme in the case of transmitting an uplink data channel for a time other than a channel occupying time of the base station may be predefined (e.g., a default resource allocation scheme) between the base station and the terminal, and a transmission resource allocation scheme (e.g., a first scheme) in the case of transmitting an uplink data channel for a channel occupying time of the base station may be configured or enabled by the base station through system information or a higher signal or UL grant. Similarly, a transmission resource allocation scheme in the case where an uplink data channel is transmitted within a channel occupying time of the base station may be predefined (e.g., a default resource allocation scheme) between the base station and the terminal, and a transmission resource allocation scheme (e.g., a first scheme) in the case where an uplink data channel is transmitted within a time other than the channel occupying time of the base station may be configured or enabled by the base station through system information or a higher signal or UL grant. In this case, a transmission resource allocation scheme (e.g., the second scheme) in the case of transmitting an uplink data channel for a time other than a channel occupying time of the base station may be configured by the UL grant, and a transmission resource allocation scheme (e.g., the first scheme) in the case of transmitting an uplink data channel for a channel occupying time of the base station may be configured or enabled by the base station through system information or a higher signal. Similarly, a transmission resource allocation scheme (e.g., a first scheme) in the case where an uplink data channel is transmitted within a channel occupying time of the base station may be configured by the UL grant, and a transmission resource allocation scheme (e.g., a second scheme) in the case where an uplink data channel is transmitted within a time other than the channel occupying time of the base station may be configured or enabled by the base station through system information or a higher signal.

Further, if the terminal is not configured with a transmission resource allocation scheme in the case of transmitting the uplink data channel within the channel occupying time of the base station, or if the transmission resource allocation scheme is not enabled, the terminal may apply the transmission resource allocation scheme in the case of transmitting the uplink data channel even within a time other than the channel occupying time of the base station to the case of transmitting the uplink data channel within the channel occupying time of the base station. Similarly, a transmission resource allocation scheme in the case where an uplink data channel is transmitted within a channel occupying time of the base station may be predefined (e.g., a default resource allocation scheme) between the base station and the terminal, and a transmission resource allocation scheme in the case where an uplink data channel is transmitted within a time other than the channel occupying time of the base station (e.g., a first scheme) may be configured or enabled by the base station through system information or a higher signal. In this case, if the terminal is not configured with a transmission resource allocation scheme in the case of transmitting the uplink data channel for a time other than the channel occupying time of the base station, or if the scheme is not enabled, the terminal may use the transmission resource allocation scheme in the case of transmitting the uplink data channel for the channel occupying time of the base station even for the case of transmitting the uplink data channel for a time other than the channel occupying time of the base station.

Method 3-5: using the same resource allocation scheme as an uplink data channel sent with a RAR UL grant

Methods 3-5 are methods in which the terminal applies the same scheme as the transmission frequency resource allocation scheme of the uplink data channel scheduled by the RAR UL grant, which is indicated or determined by one or more of the various methods according to embodiment 2 of the present disclosure. The methods 3-5 have an advantage that additional information for indicating or configuring a transmission frequency resource allocation scheme of an uplink data channel scheduled by an UL grant is not required, and a terminal can transmit all uplink data channels using the same transmission frequency resource allocation scheme without distinguishing the transmission frequency resource allocation scheme of the uplink data channel according to DCI for scheduling the uplink data channel.

[ fourth embodiment ]

In this embodiment, a method for a base station and a terminal to support multiple frequency resource allocation schemes is proposed. According to the method, a terminal receives DCI for scheduling a downlink data channel (PDSCH) from a base station, and in the case where a reception result of the received PDSCH or response signal (HARQ-ACK) information is transmitted on an uplink control channel (PUCCH), the terminal determines a transmission frequency resource allocation scheme of the uplink control channel. In embodiment 4, a case where the terminal transmits the reception result of the received PDSCH or the response signal (HARQ-ACK) information on the uplink control channel (PUCCH) is described as an example, but the present embodiment can be applied even to a case where the channel state information is transmitted through the uplink control channel (PUCCH).

Method 4-1: transmission frequency resource allocation scheme for configuring uplink control channel by system information or higher signal

Hereinafter, the method 4-1 will be described in more detail. Method 4-1 is a method in which a base station indicates or configures a transmission frequency resource allocation scheme of an uplink control channel through system information or higher signals. By indicating or configuring a transmission frequency resource allocation scheme of the uplink control channel by the system information, all terminals can transmit the uplink control channel in the same frequency resource allocation scheme in a bandwidth part in which the uplink control channel is transmitted. In this case, the transmission frequency resource allocation scheme of the uplink control channel may be included in uplink control channel-related configuration information (e.g., pucch-config) to be transmitted to the terminal. In this case, a default frequency allocation scheme between the base station and the terminal may be predefined. For example, the first scheme may be a transmission frequency resource allocation scheme of a default uplink control channel, and a frequency resource allocation scheme of a scheme other than the first scheme (e.g., a frequency resource allocation scheme of the second scheme) may be enabled by system information or a higher signal. If a frequency resource allocation scheme (e.g., the second scheme) of a scheme other than the first scheme is not enabled by system information or a higher signal, in other words, if the frequency resource allocation scheme of the second scheme is disabled, the terminal may determine that the transmission frequency resource allocation scheme of the uplink control channel is the default frequency resource allocation scheme.

If the frequency resource allocation scheme of the second scheme is enabled, the terminal determines the second scheme as a transmission frequency resource allocation scheme of the uplink control channel. In this case, if the frequency resource allocation scheme of the second scheme is enabled, the terminal may also determine that both the first scheme and the second scheme are transmission frequency resource allocation schemes of the uplink control channel, and in this case, may indicate a transmission frequency resource allocation scheme that should be used by the terminal during transmission of the uplink control channel through DCI for indicating or scheduling the uplink control channel (in other words, DCI for scheduling PDSCH), or may be determined through at least one of the other methods set forth in embodiment 4. Here, the DCI for indicating or scheduling the uplink control channel may be DCI for scheduling a PDSCH, and if the terminal receives DCI for scheduling reception of a downlink data channel (PDSCH) from the base station and the terminal transmits a reception result of the received PDSCH or response signal (HARQ-ACK) information on the uplink control channel (PUCCH), the terminal indicates configuration information, such as uplink control channel resources and time, on which the terminal will transmit a response signal through the DCI.

In addition, the transmission frequency resource allocation scheme of the uplink control channel may be configured as a resource of the uplink control channel configured by system information or higher signals. That is, the base station may configure the frequency resource allocation scheme of the uplink control channel such that the frequency resource allocation schemes of the uplink control channel are the same as or different from each other on the uplink control channel resource #0 and the uplink control channel resource # 1.

Method 4-2: determining a resource allocation scheme based on a waveform configuration of an uplink data channel

Hereinafter, the method 4-2 will be described in more detail. In a 5G system such as NR, a terminal may use various uplink transmission waveforms. For example, in the case of an NR system, a terminal may support a CP-OFDM based uplink signal waveform and a DFT-s-OFDM based uplink signal waveform, and one of the waveforms may be configured to be used from a base station, or both of the waveforms may be used. Further, different waveforms may be defined in advance to be used according to a transmission signal or channel, or may be configured by a higher signal.

For example, the terminal may determine the waveform of the uplink data channel through an Information Element (IE) of system information, such as msg 3-transformdredor of RACH-ConfigCommon. For example, if msg 3-transformdredor is enabled, the terminal may determine that a waveform of an uplink data channel is a DFT-s-OFDM based waveform, and the terminal may transmit the uplink data channel (e.g., an uplink data channel scheduled by a RAR UL grant) using the determined waveform. In this case, if the msg 3-transformdredor is disabled or a field does not exist, the terminal may determine that the waveform of the uplink data channel is a CP-OFDM based waveform, and the terminal may transmit the uplink data channel using the determined waveform. Similarly, the terminal may be additionally configured with a waveform of an uplink data channel other than the uplink data channel scheduled by the RAR UL grant, in other words, a waveform of an uplink data channel transmitted by DCI or UL grant scrambled with C-RNTI or CS-RNTI by a higher signal (e.g., transformprreceiver in pusch-Config and/or transformprreceiver in Config).

In general, the DFT-s-OFDM waveform has a characteristic of low peak-to-average power ratio (PAPR) compared to the CP-OFDM waveform, and is more applicable in the case of using continuous resource allocation on the frequency axis, whereas in the case of the CP-OFDM waveform, the CP-OFDM waveform can be used for non-continuous resource allocation. Accordingly, a resource allocation scheme of the uplink control channel can be determined according to a waveform configuration of the uplink data channel scheduled by the UL grant. For example, if a waveform of an uplink data channel scheduled by an UL grant is configured as a DFT-s-OFDM waveform, the terminal may determine that a resource allocation of an uplink control channel scheduled by an UL grant corresponds to the first scheme. The terminal may determine that the resource allocation of the uplink control channel corresponds to the second scheme if the waveform of the uplink data channel scheduled by the UL grant is configured as a CP-OFDM waveform.

In this case, the resource allocation scheme of the uplink control channel may also be determined according to a DCI format for scheduling the downlink data channel. For example, a resource allocation scheme of a downlink data channel scheduled by one of DCI formats for scheduling the downlink data channel (e.g., a DCI for scheduling fallback or default downlink data channel, e.g., DCI format 1_0) and a resource allocation scheme of an uplink data channel scheduled by the other of DCI formats for scheduling the downlink data channel (e.g., a DCI for scheduling a general downlink data channel, e.g., DCI format 1_1) may be the same as or different from each other.

That is, the NR system will be explained as an example. It may be determined that an uplink control channel transmitting a reception result or a response signal of a downlink data channel scheduled through format 1_0, which is one of DCI formats for scheduling a downlink data channel, is transmitted according to a first scheme, and an uplink control channel transmitting a reception result or a response signal of a downlink data channel scheduled through format 1_1, which is another one of DCI formats for scheduling a downlink data channel, is transmitted according to a second scheme. In this case, DCI formats 1_0 and 1_1 are merely exemplary, and the method can be applied even to another DCI format.

Also, a waveform applied during PUCCH transmission according to an uplink control channel (PUCCH) format may be different, and as one example, if a terminal transmits a PUCCH using a DFT-s-OFDM waveform, the terminal may determine that a resource allocation of the uplink control channel corresponds to the first scheme. Also, in case of transmitting PUCCH using CP-OFDM waveform, the terminal may determine that the resource allocation of the uplink control channel corresponds to the second scheme.

Method 4-3: indicating resource allocation scheme through DCI

Method 4-3 is a method of determining a resource allocation scheme of an uplink control channel for transmitting a PDSCH reception result using at least one field value among fields included in DCI for scheduling PDSCH reception.

For example, a field indicating a resource allocation scheme of an uplink control channel is introduced in DCI, and a terminal may determine the resource allocation scheme of the indicated or scheduled uplink control channel according to the field value. For example, one resource allocation type indicator of one bit size may be separately added to DCI, or an indicator of one bit size may be added to a field indicating uplink control channel information, and if the field value is 0, the field value may indicate that a resource allocation scheme of uplink control is a first scheme, and if the field value is 1, the field value may indicate that the resource allocation scheme of uplink control channel is a second scheme. In this case, the resource allocation scheme indicated by the name and size of the field and the bit value is only exemplary.

Method 4-4: determining a transmission frequency resource allocation scheme depending on whether an uplink data channel scheduled by an UL grant is transmitted within a channel occupancy time of a base station

Hereinafter, the method 4-4 will be described in more detail. Method 4-4 is a method of determining a transmission frequency resource allocation scheme of an uplink control channel according to whether the uplink control channel is transmitted within a channel occupying time of a base station. By this method, transmission frequency resource allocation schemes of uplink control channels may be identical to or different from each other depending on whether the uplink control channels are transmitted within or in a time other than a channel occupying time of the base station, and thus, the transmission frequency resource allocation schemes of the uplink control channels may be identical to or different from the transmission frequency resource allocation scheme of the uplink control channels indicated or configured by at least one of the methods 4-1, 4-2, and 4-3.

Preferably, the base station controls uplink signal transmission of the terminal during a channel occupying time in which the base station accesses and uses the channel after performing the channel access procedure. For example, a base station may transmit a UL grant on a downlink control channel to one or more terminals, and a terminal that has received the UL grant may transmit an uplink data channel in accordance with the UL grant. Further, the base station may instruct to transmit an uplink control channel (PUCCH) or a data channel (PUSCH) to one or more terminals, and may multiplex the uplink signal and the channel. Accordingly, the base station needs to efficiently multiplex the uplink signal and the channel transmitted by the terminal in at least one slot or transmission time interval by having the same resource allocation scheme for the uplink signal and the channel at least in the channel occupying time. Therefore, there is a need for a method of independently configuring a transmission frequency resource allocation scheme depending on whether at least an uplink control channel is transmitted within a channel occupying time of a base station.

For example, the terminal may transmit the uplink control channel using a transmission resource allocation scheme (e.g., a first scheme) in the case where the uplink control channel is transmitted within the channel occupying time of the base station and a transmission resource allocation scheme (e.g., a second scheme) in the case where the uplink control channel is transmitted within a time other than the channel occupying time of the base station. In this case, a transmission resource allocation scheme in the case of transmitting the uplink control channel for a time other than the channel occupying time of the base station may be predefined (e.g., a default resource allocation scheme) between the base station and the terminal, and the transmission resource allocation scheme (e.g., the first scheme) in the case of transmitting the uplink control channel for the channel occupying time of the base station may be configured or enabled by the base station through system information or a higher signal or DCI for scheduling the PDSCH. Similarly, a transmission resource allocation scheme in the case where the uplink control channel is transmitted within the channel occupying time of the base station may be predefined (e.g., a default resource allocation scheme) between the base station and the terminal, and a transmission resource allocation scheme (e.g., a first scheme) in the case where the uplink control channel is transmitted within a time other than the channel occupying time of the base station may be configured or enabled by the base station through system information or a higher signal or DCI for scheduling the PDSCH. In this case, a transmission resource allocation scheme (e.g., a second scheme) in the case of transmitting an uplink control channel for a time other than a channel occupying time of the base station may be configured by DCI for scheduling a PDSCH, and a transmission resource allocation scheme (e.g., a first scheme) in the case of transmitting an uplink control channel for a channel occupying time of the base station may be configured or enabled by system information or a higher signal. Similarly, a transmission resource allocation scheme (e.g., a first scheme) in the case of transmitting an uplink control channel within a channel occupying time of the base station may be configured by DCI for scheduling a PDSCH, and a transmission resource allocation scheme (e.g., a second scheme) in the case of transmitting an uplink control channel within a time other than the channel occupying time of the base station may be configured or enabled by system information or a higher signal.

Further, if the terminal is not configured with a transmission resource allocation scheme in the case of transmitting the uplink control channel within the channel occupying time of the base station, or if the transmission resource allocation scheme is not enabled, the terminal may apply a transmission resource allocation scheme in the case of transmitting the uplink control channel even within a time other than the channel occupying time of the base station to the case of transmitting the uplink control channel within the channel occupying time of the base station. Similarly, a transmission resource allocation scheme in the case where the uplink control channel is transmitted within the channel occupying time of the base station may be predefined (e.g., a default resource allocation scheme) between the base station and the terminal, and a transmission resource allocation scheme in the case where the uplink control channel is transmitted within a time other than the channel occupying time of the base station (e.g., a first scheme) may be configured or enabled by the base station through system information or a higher signal. In this case, if the terminal is not configured with a transmission resource allocation scheme in the case of transmitting the uplink control channel for a time other than the channel occupying time of the base station, or if the scheme is not enabled, the terminal may apply the transmission resource allocation scheme in the case of transmitting the uplink control channel for the channel occupying time of the base station even to the case of transmitting the uplink control channel for a time other than the channel occupying time of the base station.

As described above, the terminal may determine a transmission resource allocation scheme (e.g., a first scheme) in the case where the uplink control channel is transmitted within the channel occupying time of the base station and a transmission resource allocation scheme (e.g., a second scheme) in the case where the uplink control channel is transmitted within a time other than the channel occupying time of the base station, and the terminal may determine whether the uplink data channel transmission time or the transmission slot is a time within the channel occupying time of the base station or a time other than the channel occupying time, and the terminal may transmit the uplink data channel through the correct transmission resource allocation scheme according to the result of the determination. In this case, the terminal may determine whether the base station occupies the channel or whether the base station accesses the channel depending on whether a reference signal (e.g., DMRS) transmitted by the base station is detected, or the terminal may determine whether the base station occupies the channel by receiving information on whether the base station accesses the channel or information on a channel occupancy time of the base station transmitted through a downlink control channel by the base station.

Method 4-5: using the same resource allocation scheme as the uplink data channel

Methods 4-5 are methods in which a terminal transmits an uplink control channel by applying the same scheme as a transmission frequency resource allocation scheme of an uplink data channel scheduled by an UL grant, which is indicated or determined by one or more of various methods according to embodiment 3 of the present disclosure. The advantages of methods 4-5 are that no additional information is required for indicating or configuring the transmission frequency resource allocation scheme of the uplink control channel, and according to this method, all uplink data channels and uplink control channels can use the same transmission frequency resource allocation scheme.

In this case, the terminal may further include a method of transmitting an uplink control channel by applying the same scheme as a transmission frequency resource allocation scheme of an uplink data channel scheduled by the RAR UL grant, which is indicated or determined by one or more of various methods according to embodiment 3 of the present disclosure.

[ example (4-2) ]

In this embodiment, a method for a base station and a terminal to support multiple frequency resource allocation schemes is proposed. According to the method, in a case where a terminal receives DCI for scheduling a downlink data channel (PDSCH) from a base station and transmits a reception result of the received PDSCH or response signal (HARQ-ACK) information on an uplink control channel (PUCCH), the terminal determines a PUCCH transmission resource if a transmission frequency resource allocation scheme of the uplink control channel determined or configured according to the fourth embodiment is a frequency resource allocation scheme of the second scheme. In embodiment 4-2, a case where the terminal transmits the reception result of the received PDSCH or the response signal (HARQ-ACK) information on the uplink control channel (PUCCH) is described as an example, but the present embodiment can be applied even to a case where the channel state information is transmitted through the uplink control channel (PUCCH).

If the frequency resource allocation scheme of the second scheme is configured as a PUCCH frequency resource allocation scheme for PUCCH transmission, or if the frequency resource allocation scheme of the second scheme is enabled, the terminal may be allocated with PUCCH resources in units of uplink control channel resources # k. In other words, one uplink control channel resource becomes a basic transmission frequency resource for PUCCH transmission. For example, the terminal may be allocated with uplink control channel resource index # 3940 in fig. 9B as a frequency resource # m of the PUCCH, and the terminal may transmit the PUCCH # m using a PRB included in the uplink control channel resource # 3940. At this time, the uplink control channel resource may be independently configured for each PUCCH resource, and the uplink control channel resource may also be independently configured for each PUCCH format or PUCCH resource set.

In this case, in the case of transmitting a large amount of information (payload) through the PUCCH, the terminal may require a large amount of PUCCH resources. Therefore, it is necessary to allocate a plurality of uplink control channel resources to the terminal in the PUCCH resource index # m. Hereinafter, in the present disclosure, an assumption that two uplink control channel resources are allocated will be described, but the present disclosure is not limited thereto.

The terminal may be allocated one uplink control channel resource or two uplink control channel resources for the PUCCH resource # m. If the terminal is configured to use two uplink control channel resources for the PUCCH resource # m, the terminal may implicitly or explicitly determine the second uplink control channel resource using the first uplink control channel resource.

For example, as described above, the terminal allocated with the uplink control channel resource # k as the PUCCH resource # m can determine the second uplink control channel resource by the following method.

The method comprises the following steps: for PUCCH resource # m, the method determines only the next resource or resource index of the first uplink control channel resource (e.g., interlace 0) configured by a higher signal as the second uplink control channel resource (e.g., interlace 1) of PUCCH resource # m.

For example, if an uplink control channel resource # k is allocated as a first uplink control channel resource (interlace 0) by a higher signal terminal for PUCCH # m, the terminal may determine the next index # k +1 of the uplink control channel resource as a second uplink control channel resource (interlace 1). In this case, if there are M effective uplink control channel resources in total, the second uplink control channel resource can be determined by modulo operation of the next index configured as the index of the first uplink control channel resource with the M control channel resources for the higher signal terminal for PUCCH # M. That is, a terminal that has been configured with a first uplink control channel resource (e.g., interlace 0) # k as a resource of PUCCH # M through a higher signal may determine that the index of the second uplink control channel resource is modulo (k +1, M).

The method 2 comprises the following steps: the method determines a second uplink control channel resource (e.g., interlace 1) of the PUCCH resource # m using a first uplink control channel resource (e.g., interlace 0) configured by a higher signal for the PUCCH resource # m and offset information.

For example, the terminal may be configured with a first uplink control channel resource (interlace 0) of PUCCH # m and an additional offset value i of a second uplink control channel resource determined by a higher signal. In this case, the terminal may determine # k + i to which the offset value is applied based on the configured first uplink control channel resource # k as an index of the second uplink control channel resource (interlace 0). In this case, the offset i may be an integer including a negative number, 0, and a positive number, or the offset i may be a positive integer equal to or greater than 0.

In this case, in the same manner as in method 1, if there are M effective uplink control channel resources in total, the terminal may determine the second uplink control channel resource by modulo operation on the first uplink control channel resource (interlace 0) index of PUCCH # M configured by a higher signal, the uplink control channel resource (interlace 1) index determined by offset information, and the number M of control channel resources. That is, a terminal configured with a first uplink control channel resource (e.g., interlace 0) # k as PUCCH resource # M through a higher signal may determine that the index of the second uplink control channel resource is modulo (k + i, M).

The method 3 comprises the following steps: the method configures all first uplink control channel resources (e.g., interlace 0) and second uplink control channel resources (interlace 1) for PUCCH resource # m with higher signals.

Even in the case where two or more uplink control channel resources are configured, if the amount of information (payload) to be actually transmitted is small, the terminal can transmit the PUCCH using only one uplink control channel resource. For example, the terminal may perform PUCCH transmission using a minimum number of PRBs capable of satisfying a code rate equal to or higher than a code rate configured for Uplink Control Information (UCI) transmission transmitted through the PUCCH or a code rate determined for UCI transmission. In this case, in the case of using the uplink control channel of the frequency resource allocation scheme of the second scheme, the minimum frequency allocation resource is an uplink control channel resource (in the case of fig. 9B, the uplink control channel resource # 0930 or the uplink control channel resource # 3940), and thus the terminal can transmit the uplink control channel using the minimum uplink control channel resource (or interlace) capable of satisfying a code rate equal to or higher than a code rate configured for UCI transmission transmitted on the PUCCH or a code rate determined for UCI transmission. That is, if the terminal configures two uplink control channels in the PUCCH resource # m and the above-mentioned minimum uplink control channel resource is one uplink control channel, the terminal transmits UCI using one of the two configured uplink control channels. In this case, the terminal may select an uplink control channel resource to be used for actual transmission among the two uplink control channel resources configured in the PUCCH resource # m by selecting one or a combination of the two uplink control channel resources.

The method A comprises the following steps: the terminal may select an uplink control channel resource having a lowest uplink control channel resource index or an uplink control channel resource having a highest uplink control channel resource index, and the terminal may transmit UCI using the selected uplink control channel resource.

The method B comprises the following steps: the terminal may transmit the uplink control channel using the uplink control channel resource configured by the higher signal.

The terminal may transmit UCI using an uplink control channel resource index among a plurality of uplink control channel resources configured with PUCCH resource # m or an uplink control channel resource of the first uplink control channel resource (interlace 0). For example, in case of method 2, the first uplink control channel among the uplink control channel resources of PUCCH resource # m is a resource corresponding to a resource index (interlace 0) by a higher signal configuration. The second uplink control channel among the uplink control channel resources of the PUCCH resource # m is an uplink control channel resource determined or configured using the first uplink control channel and the offset information. In this case, method B transmits the uplink control channel using the uplink control channel resource index in the uplink control channel resource # m configured with the PUCCH or the uplink control channel resource of the first uplink control channel resource (interlace 0), and thus the terminal transmits UCI using the first uplink control channel (interlace 0) in the uplink control channel resource of the PUCCH resource # m.

If there are a plurality of uplink control channel resources configured with uplink control channel resource indexes, as in method a, the terminal may select an uplink control channel resource having the lowest uplink control channel resource index and an uplink control channel resource having the highest uplink control channel resource index, and the terminal may transmit an uplink control channel using the selected uplink control channel resources.

In this case, like method 2, method B configures the second uplink control channel resource by the offset more efficiently. For example, assume that the base station configures two uplink control channel resources #0 and #1 for two terminals, and the two terminals share and use these resources. In this case, the base station may configure the terminal #0 with the uplink control channel resource #0 and the offset 1, and the base station may configure the terminal #1 with the uplink control channel resource #1 and the offset-1. If the uplink control channel resource required for actual UCI transmission is smaller than the uplink control channel resource configured on the PUCCH resource in terminal #0 and terminal #1, the terminal transmits UCI using the uplink control channel resource configured with the uplink control channel resource index or the first uplink control channel resource according to method B. In this case, the terminal #0 transmits UCI through the uplink control channel resource #0 and the terminal #1 transmits UCI through the uplink control channel resource #1, so that two terminals can transmit UCI on different resources without overlapping.

The method C comprises the following steps: the terminal configures uplink control channel resources to be used for actual transmission through a higher signal, and the terminal transmits an uplink control channel through the configured uplink control channel resources.

Even if a plurality of uplink control channel resources of PUCCH resource # m are configured for the terminal, the uplink control channel resources required for actual UCI transmission may be smaller than the uplink control channel resources configured for PUCCH resource # m. In this case, the terminal transmits UCI by selecting some of the configured plurality of resources. Method C is a method in which the terminal configures information on uplink control channel resources for actual UCI transmission in a plurality of uplink control channel resources or corresponding indexes through a higher signal if the uplink control channel resources required for the actual UCI transmission are less than the configured uplink control channel resources. For example, the terminal may configure two uplink control channel resources (interlace 0 and interlace 1) included in the PUCCH resource # m with a higher signal. In addition, if the uplink control channel resources required for actual UCI transmission are less than the plurality of configured uplink control channel resources, the terminal may configure the uplink control channel resources for UCI transmission or corresponding index information (e.g., interlace 1). In other words, if one uplink control channel resource is required for actual UCI transmission through PUCCH # m, the terminal may transmit actual UCI using an uplink control channel resource (interlace 1) configured by a higher signal of two uplink control channel resources (interlace 0 and interlace 1) configured on PUCCH # m. Uplink control channel resources or index information (or priority uplink control channel resources or indexes) to be used for actual UCI transmission may be indicated to the terminal through DCI from the base station.

[ fifth embodiment ]

In this embodiment, a method for a base station and a terminal to support multiple frequency resource allocation schemes is proposed. According to the method, if a terminal transmits a Sounding Reference Signal (SRS) to a base station, the terminal determines a transmission frequency resource allocation scheme for the sounding reference signal.

Method 5-1: transmission frequency resource allocation scheme for configuring uplink control channel by system information or higher signal

Hereinafter, the method 5-1 will be described in more detail. Method 5-1 is a method in which a base station indicates or configures a transmission frequency resource allocation scheme for a sounding reference signal to a terminal through system information or a higher signal. Since the base station indicates or configures a transmission frequency resource allocation scheme of the sounding reference signal through the system information, all terminals can transmit the sounding reference signal in the same frequency resource allocation scheme in a bandwidth part in which the sounding reference signal is transmitted. In this case, the transmission frequency resource allocation scheme of the sounding reference signal may be included in the sounding reference signal related configuration information (e.g., srs-config) to be transmitted to the terminal. In this case, a default frequency allocation scheme between the base station and the terminal may be predefined. For example, the first scheme may be a transmission frequency resource allocation scheme of a default sounding reference signal, and a frequency resource allocation scheme of a scheme other than the first scheme (e.g., a frequency resource allocation scheme of the second scheme) may be enabled by system information or a higher signal. If a frequency resource allocation scheme (e.g., a second scheme) of a scheme other than the first scheme is not enabled by system information or a higher signal, in other words, if the frequency resource allocation scheme of the second scheme is disabled, the terminal may determine that the transmission frequency resource allocation scheme of the sounding reference signal is a default frequency resource allocation scheme.

If the frequency resource allocation scheme of the second scheme is enabled, the terminal determines the second scheme as a transmission frequency resource allocation scheme of the sounding reference signal. In this case, if the frequency resource allocation scheme of the second scheme is enabled, the terminal may also determine that both the first scheme and the second scheme are transmission frequency resource allocation schemes for the sounding reference signal, and in this case, may indicate a transmission frequency resource allocation scheme that should be used by the terminal during transmission of the sounding reference signal through DCI for indicating or scheduling an uplink control channel (in other words, DCI for indicating transmission of the sounding reference signal), or may be determined through at least one of the other methods set forth in embodiment 5. Here, the DCI for indicating or scheduling transmission of the sounding reference signal may represent a case where one field indicates, requests, or triggers transmission of the sounding reference signal in: DCI for scheduling reception of a downlink data channel (PDSCH) transmitted by a base station, DCI for scheduling transmission of an uplink data channel (PUSCH), UL grant information, or group common DCI for indicating transmission of a sounding reference signal to one or more terminals.

Further, the transmission frequency resource allocation scheme of the sounding reference signal may be configured for a resource of the sounding reference signal or a set of sounding reference signal resources configured by system information or higher signals. That is, the base station may configure the frequency resource allocation schemes of the sounding reference signal resource #0 and the sounding reference signal resource #1 such that the frequency resource allocation schemes of the sounding reference signal resource #0 and the sounding reference signal resource #1 are the same as or different from each other.

Method 5-2: determining a resource allocation scheme based on a waveform configuration of an uplink data channel

The terminal may determine a resource allocation scheme of the sounding reference signal according to a waveform configuration of an uplink data channel scheduled by the RAR UL grant or the UL grant. For example, if the waveform of the uplink data channel is configured as a DFT-s-OFDM waveform, the terminal may determine that the resource allocation of the sounding reference signal corresponds to the first scheme. The terminal may determine that the resource allocation of the sounding reference signal corresponds to the second scheme if the waveform of the uplink data channel is configured as a CP-OFDM waveform.

Similarly, the terminal may determine a resource allocation scheme of the sounding reference signal according to a waveform configuration of the uplink control channel. For example, if the waveform of the uplink data channel is configured as a DFT-s-OFDM waveform, the terminal may determine that the resource allocation of the sounding reference signal corresponds to the first scheme. The terminal may determine that the resource allocation of the sounding reference signal corresponds to the second scheme if the waveform of the uplink data channel is configured as a CP-OFDM waveform. If one or more waveforms are used to transmit the uplink control channel according to the format of the uplink control channel, the terminal may determine a resource allocation scheme of the sounding reference signal according to the waveform configuration of the uplink data channel.

Method 5-3: indicating resource allocation scheme through DCI

Method 5-3 is a method of determining a resource allocation scheme of a sounding reference signal through a sounding reference signal transmission request field (SRS request field) included in DCI indicating transmission of the sounding reference signal. For example, a field indicating a value of a resource allocation scheme is introduced in a value of a sounding reference signal transmission request field, and the terminal may determine the resource allocation scheme of the sounding reference signal indicated or scheduled according to the field value. For example, one resource allocation type indicator of one bit size may be separately added to DCI for indicating or requesting transmission of a sounding reference signal, or an indicator of one bit size may be added to a field indicating transmission of a sounding reference signal (SRS request field), and if the field value is 0, the field value may indicate that a resource allocation scheme of the sounding reference signal is a first scheme, and if the field value is 1, the field value may indicate that the resource allocation scheme of the sounding reference signal is a second scheme. In this case, the resource allocation scheme indicated by the name and size of the field and the bit value is only exemplary.

Method 5-4: determining a transmission frequency resource allocation scheme depending on whether an uplink control channel is transmitted within a channel occupancy time of a base station

Hereinafter, the method 5-4 will be described in more detail. Method 5-4 is a method of determining a transmission frequency resource allocation scheme for a sounding reference signal depending on whether the sounding reference signal is transmitted within a channel occupying time of a base station. By this method, transmission frequency resource allocation schemes of the sounding reference signals may be the same as or different from each other depending on whether the sounding reference signals are transmitted within a channel occupying time of the base station or transmitted in a time other than the channel occupying time of the base station, and thus, the transmission frequency resource allocation schemes of the sounding reference signals may be the same as or different from the transmission frequency resource allocation scheme of the sounding reference signals indicated or configured by at least one of the method 5-1, the method 5-2, and the method 5-3.

Preferably, the base station controls uplink signal transmission of the terminal during a channel occupying time in which the base station accesses and uses the channel after performing the channel access procedure. For example, a base station may transmit a UL grant on a downlink control channel to one or more terminals, and a terminal that has received the UL grant may transmit an uplink data channel in accordance with the UL grant. Further, the base station may instruct to transmit an uplink control channel (PUCCH) or a data channel (PUSCH) to one or more terminals, and may multiplex the uplink signal and the channel. Accordingly, the base station needs to efficiently multiplex the uplink signal and the channel transmitted by the terminal in at least one slot or transmission time interval by having the same resource allocation scheme for the uplink signal and the channel at least in the channel occupying time. Therefore, there is a need for a method of independently configuring a transmission frequency resource allocation scheme depending on whether at least an uplink control channel is transmitted within a channel occupying time of a base station.

For example, the terminal may transmit the sounding reference signal using a transmission resource allocation scheme (e.g., a first scheme) in the case where the sounding reference signal is transmitted within a channel occupying time of the base station and a transmission resource allocation scheme (e.g., a second scheme) in the case where the sounding reference signal is transmitted within a time other than the channel occupying time of the base station. In this case, a transmission resource allocation scheme in the case of transmitting the sounding reference signal within a time other than the channel occupying time of the base station may be predefined (e.g., a default resource allocation scheme) between the base station and the terminal, and a transmission resource allocation scheme (e.g., a first scheme) in the case of transmitting the sounding reference signal within the channel occupying time of the base station may be configured or enabled by the base station through system information or a higher signal or DCI for indicating or requesting transmission of the sounding reference signal. Similarly, a transmission resource allocation scheme in the case where the sounding reference signal is transmitted within the channel occupying time of the base station may be predefined (e.g., a default resource allocation scheme) between the base station and the terminal, and a transmission resource allocation scheme in the case where the sounding reference signal is transmitted within a time other than the channel occupying time of the base station (e.g., a first scheme) may be configured or enabled by the base station through system information or a higher signal or DCI for indicating or requesting transmission of the sounding reference signal. In this case, a transmission resource allocation scheme (e.g., a second scheme) in the case of transmitting the sounding reference signal within a time other than a channel occupying time of the base station may be configured by DCI for indicating or requesting transmission of the sounding reference signal, and a transmission resource allocation scheme (e.g., a first scheme) in the case of transmitting the sounding reference signal within the channel occupying time of the base station may be configured or enabled by system information or a higher signal. Similarly, a transmission resource allocation scheme (e.g., a first scheme) in the case where the sounding reference signal is transmitted within the channel occupying time of the base station may be configured by DCI for indicating or requesting transmission of the sounding reference signal, and a transmission resource allocation scheme (e.g., a second scheme) in the case where the sounding reference signal is transmitted within a time other than the channel occupying time of the base station may be configured or enabled by system information or a higher signal.

Further, if the terminal is not configured with a transmission resource allocation scheme in the case of transmitting the sounding reference signal within the channel occupying time of the base station, or if the transmission resource allocation scheme is not enabled, the terminal may apply the transmission resource allocation scheme in the case of transmitting the sounding reference signal within the channel occupying time of the base station even to the case of transmitting the sounding reference signal within the channel occupying time of the base station. Similarly, a transmission resource allocation scheme in the case where the sounding reference signal is transmitted within the channel occupying time of the base station may be predefined (e.g., a default resource allocation scheme) between the base station and the terminal, and a transmission resource allocation scheme in the case where the sounding reference signal is transmitted within a time other than the channel occupying time of the base station (e.g., a first scheme) may be configured or enabled by the base station through system information or higher signals. In this case, if the terminal is not configured with a transmission resource allocation scheme in the case of transmitting the sounding reference signal during a time other than the channel occupying time of the base station, or if the scheme is not enabled, the terminal may even apply the transmission resource allocation scheme in the case of transmitting the sounding reference signal during the channel occupying time of the base station to the case of transmitting the sounding reference signal during a time other than the channel occupying time of the base station.

As described above, the terminal may determine a transmission resource allocation scheme (e.g., a first scheme) in the case where the sounding reference signal is transmitted within the channel occupying time of the base station and a transmission resource allocation scheme (e.g., a second scheme) in the case where the sounding reference signal is transmitted within a time other than the channel occupying time of the base station, and the terminal may determine whether the uplink data channel transmission time or the transmission slot is a time within the channel occupying time of the base station or a time other than the channel occupying time, and the terminal may transmit the sounding reference signal through a correct transmission resource allocation scheme according to a result of the determination. In this case, the terminal may determine whether the base station occupies the channel or whether the base station accesses the channel depending on whether a reference signal (e.g., DMRS) transmitted by the base station is detected, or the terminal may determine whether the base station occupies the channel by receiving information on whether the base station accesses the channel or information on a channel occupancy time of the base station transmitted through a downlink control channel by the base station.

Method 5-5: using the same resource allocation scheme as the uplink data channel

Method 5-5 is a method in which a terminal transmits a sounding reference signal by applying the same scheme as a transmission frequency resource allocation scheme of an uplink data channel scheduled by an UL grant, which is indicated or determined by one or more of various methods according to embodiment 3 of the present disclosure. The advantage of method 5-5 is that no additional information for indicating or configuring the transmission frequency resource allocation scheme of the sounding reference signal is required, and according to this method, all uplink data channels and sounding reference signals can use the same transmission frequency resource allocation scheme. In particular, if the uplink data channel and the sounding reference signal are continuously transmitted, the same transmission frequency resource allocation scheme is used for the uplink data channel and the sounding reference signal, so that unnecessary resource allocation scheme changes can be avoided. In this case, the method 5-5 may further include a method of transmitting, by the terminal, the sounding reference signal by applying the same scheme as the transmission frequency allocation scheme of the uplink control channel scheduled by the RAR UL grant, which is indicated or determined by one or more of the various methods of embodiment 2 and embodiment 3 of the present disclosure.

According to various embodiments of the present disclosure, although a method for determining a resource allocation scheme of an uplink signal or channel has been provided, a resource allocation scheme of one or more uplink signals or channels may also be determined by combining and modifying one or more embodiments. Further, in the present disclosure, although the method for determining the resource allocation scheme of the corresponding uplink signal or channel has been described assuming that the resource allocation scheme of the corresponding uplink signal or channel is independently indicated or configured, the resource allocation scheme of the uplink signal or channel may be commonly applied to all uplink signals or channels transmitted in an uplink carrier, an uplink cell, or an uplink bandwidth part, and in this case, it may be determined that the resource allocation scheme of the uplink signal or channel indicated or configured in the uplink carrier, the uplink cell, or the uplink bandwidth part is applied instead of indicating or configuring the corresponding uplink signal or channel.

In the present disclosure, although a method of determining a resource allocation scheme of a corresponding uplink signal or channel according to a waveform configuration configured or defined in the corresponding uplink signal or channel is provided, the waveform configuration of the uplink signal or channel may be commonly applied to all uplink signals or channels transmitted in an uplink carrier, an uplink cell, or an uplink bandwidth part. In this case, the waveform configuration of the uplink signal or channel may be a waveform configuration of the uplink signal or channel indicated or configured in an uplink carrier, an uplink cell, or an uplink bandwidth part, instead of the configuration of the uplink signal or channel, and the resource allocation scheme of the corresponding uplink signal or channel may be determined based on the configured waveform.

In addition, in the present disclosure, the default transmission frequency resource allocation manner between the base station and the terminal refers to a frequency resource allocation scheme in which some or all of uplink signals or channels have been defined in advance between the base station and the terminal. In this case, the default transmission frequency resource allocation scheme may be one of a combination and a modification of uplink resource allocation type 0, uplink resource allocation type 1, and uplink resource allocation type 2 or a resource allocation scheme, and may be determined according to an uplink transmission signal or channel, or a waveform of the uplink transmission signal or channel.

Fig. 10 is a flowchart of a method for a base station to determine allocation of frequency domain resources in a wireless communication system according to an embodiment of the present disclosure. The base station is exemplified by the base station 110 of fig. 1.

Referring to fig. 10, in operation 1000, a base station may determine a frequency resource allocation scheme of uplink signals and channels. For example, the frequency resource allocation schemes of the uplink signals and channels may be the same as or different from each other depending on whether the uplink signals and channels are signals and channels transmitted in an unlicensed frequency band or a licensed frequency band. For example, if the uplink signal and channel are signals and channels transmitted in an unlicensed frequency band, a method including uplink frequency resource allocation type 1, type 2, or type 3 according to the present disclosure may be used as a frequency resource allocation scheme for the uplink signal and channel. If the uplink signals and channels are signals and channels transmitted in a licensed frequency band, a method including uplink frequency resource allocation type 0 and type 1 according to the present disclosure may be used as a frequency resource allocation scheme for the uplink signals and channels. Further, in operation 1000, the base station may configure configuration information required to transmit/receive uplink signals and channels including a bandwidth part-related configuration. In this case, the base station may indicate or configure a frequency resource allocation scheme for uplink signals and channels of the terminal according to various embodiments and methods of the present disclosure.

Thereafter, the base station may transmit a transmission/reception configured uplink signal and configuration information required for a channel to one or more terminals through system information, a System Information Block (SIB), or a higher signal in operation 1010. Thereafter, the base station may transmit downlink signals and channels to the terminal according to configuration information required to transmit/receive the configured uplink signals and channels or the base station may receive uplink signals and channels from the terminal in operation 1020.

Fig. 11 is a flowchart of a method for a terminal to determine allocation of frequency domain resources in a wireless communication system according to an embodiment of the present disclosure. The terminal is exemplified by the terminal 120 or 130 of fig. 1.

Referring to fig. 11, in operation 1100, a terminal may receive configuration information regarding a frequency resource allocation scheme for uplink signals and channels configured by a base station through at least one of a system information block and higher signals from the base station. In this case, the frequency resource allocation schemes of the uplink signals and channels may be the same as or different from each other depending on whether the uplink signals and channels are signals and channels transmitted in the unlicensed frequency band or the licensed frequency band. More specifically, if the uplink signal and channel are signals and channels transmitted in an unlicensed frequency band, the base station may configure a method including uplink frequency resource allocation type 1, type 2, or type 3 according to the present disclosure as a frequency resource allocation scheme of the uplink signal and channel. If the uplink signals and channels are signals and channels transmitted in a licensed frequency band, the method including uplink frequency resource allocation type 0 and type 1 according to the present disclosure may be configured as a frequency resource allocation scheme of the uplink signals and channels. Further, in operation 1100, the terminal may receive configuration information required for transmission/reception of uplink signals and channels configured by the base station including a bandwidth part-related configuration. Thereafter, the terminal may configure variables required for transmitting an uplink signal including the frequency resource allocation scheme and a channel according to the configuration information received in operation 1100 in operation 1110. In operation 1120, the terminal may transmit an uplink signal and a channel according to the frequency resource allocation type configured in operation 1110.

Fig. 12 is another flowchart of a method for a terminal to determine allocation of frequency domain resources in a wireless communication system according to an embodiment of the present disclosure. The terminal is exemplified by the terminal 120 or 130 of fig. 1.

Referring to fig. 12, in operation 1200, a terminal may receive configuration information regarding a frequency resource allocation scheme for uplink signals and channels configured by a base station through at least one of a system information block and higher signals from the base station. In this case, the frequency resource allocation schemes of the uplink signals and channels may be the same as or different from each other depending on whether the uplink signals and channels are signals and channels transmitted in the unlicensed frequency band or the licensed frequency band. More specifically, if the uplink signal and channel are signals and channels transmitted in an unlicensed frequency band, the base station may configure a method including uplink frequency resource allocation type 1, type 2, or type 3 according to the present disclosure as a frequency resource allocation scheme of the uplink signal and channel. If the uplink signals and channels are signals and channels transmitted in a licensed frequency band, the method including uplink frequency resource allocation type 0 and type 1 according to the present disclosure may be configured as a frequency resource allocation scheme of the uplink signals and channels.

If the uplink signal and the channel are transmitted in the unlicensed frequency band, the terminal may be configured with a frequency resource allocation scheme of the uplink signal or the channel in the case of transmitting the uplink signal and the channel within a channel occupying time of the base station and a frequency resource allocation scheme of the uplink signal or the channel in the case of transmitting the uplink signal and the channel within a time other than the channel occupying time of the base station. In this case, with respect to at least one of a frequency resource allocation scheme of an uplink signal or channel in the case where the uplink signal and channel are transmitted within a channel occupying time of the base station and a frequency resource allocation scheme of an uplink signal or channel in the case where the uplink signal and channel are transmitted within a time other than the channel occupying time of the base station (for example, the uplink signal and channel are transmitted within a time other than the channel occupying time of the base station), the frequency resource allocation scheme of the uplink signal and channel may follow the frequency resource allocation scheme of the uplink data channel scheduled by a default frequency resource allocation type or a preamble or RAR UL grant, and may also allocate a frequency resource allocation scheme for the uplink signal or channel relative to another case (e.g., transmitting the signal and channel within the channel occupancy time of the base station).

Further, in operation 1200, the terminal may receive configuration information required for transmission/reception of uplink signals and channels configured by the base station including a bandwidth part-related configuration. Thereafter, in operation 1210, the terminal may identify and configure variables required for transmitting uplink signals including the frequency resource allocation scheme and channels according to the configuration information received in operation 1100. Thereafter, the terminal may transmit uplink signals and channels according to the frequency resource allocation scheme configured in operation 1210.

Further, in operation 1220, the terminal determines whether the transmission of the uplink signal or channel is a transmission within a time within the channel occupancy time of the base station. If the uplink signal or channel is transmitted within the time or time slot within the channel occupancy time of the base station, the terminal transmits a signal according to the frequency resource allocation scheme of the uplink signal or channel determined in operation 1200, which is transmitted within the time or time slot within the channel occupancy time of the base station, in operation 1240. If the uplink signal or channel is transmitted within a time or a time slot other than the channel occupying time of the base station, the terminal transmits a signal according to the frequency resource allocation scheme of the uplink signal or channel determined in operation 1200, which is transmitted within the time or the time slot other than the channel occupying time of the base station, in operation 1230.

In the present disclosure, although the expressions "equal to or greater than" and "equal to or less than" have been used to determine whether a specific condition (or reference) is satisfied, this is merely for the purpose of expressing a description of the embodiments and does not exclude the description of "exceeding" or "being less than". A condition described as "equal to or greater than" may be replaced with "exceeding", a condition described as "equal to or less than" may be replaced with "less than", and a condition described as "equal to or greater than and less than" may be replaced with "exceeding and equal to or less than".

The method according to the embodiments described in the claims and the specification of the present disclosure may be implemented in hardware, software, or a combination of hardware and software.

In the case of implementation by software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium are configured to be executed by one or more processors in the electronic device. The one or more programs include instructions that cause the electronic device to perform methods according to embodiments of the disclosure described in the claims or specification.

Such programs (software modules or software) may be stored in non-volatile memory, including random access and flash memory, Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), magnetic disk storage devices, compact disk-ROM (CD-ROM), Digital Versatile Disks (DVD) or other types of optical storage devices, or magnetic tape. Further, the program may be stored in a memory constituted by a combination of part or all of them. Further, a plurality of memories may be included.

Further, the program may be stored in an attachable storage device accessible over a communication network, such as the internet, an intranet, a Local Area Network (LAN), a wide area network (WLAN), or a Storage Area Network (SAN), or a combination thereof. The storage device is accessible through an external port by a device executing an embodiment of the present disclosure. Furthermore, a separate storage device on a communication network may access a device that performs embodiments of the present disclosure.

The present disclosure relates to communication methods and systems for fusing a 5 th generation (5G) communication system for supporting higher data rates than a fourth generation (4G) system with technologies for internet of things (IoT). The present disclosure is applicable to smart services based on 5G communication technologies and IoT related technologies, such as smart homes, smart buildings, smart cities, smart cars, interconnected cars, healthcare, digital education, smart retail, security, and security services.

The embodiments described in this specification have been described separately, but two or more embodiments may be combined and practiced. For example, some of the methods presented in this disclosure may be combined with each other to operate the base station and the terminal. Further, the above embodiments are proposed based on 5G or NR systems, but other modifications based on the technical concept of the embodiments will be applicable to other systems such as LTE, LTE-a, and LTE-a-Pro systems.

While the disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents.

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Method and apparatus for frequency domain resource allocation in a wireless communication system

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