阅读说明：本技术 用于在无线通信系统中为直接通信配置无线电链路控制层参数的设备和方法 (Apparatus and method for configuring radio link control layer parameters for direct communication in wireless communication system ) 是由 姜贤贞 阿尼尔·阿基瓦尔 白祥圭 于 2020-03-30 设计创作，主要内容包括：本公开涉及一种用于融合支持超过第四代(4G)系统的更高数据速率的第五代(5G)通信系统与物联网(IoT)技术的通信方法和系统。本公开可以应用于基于5G通信技术和IoT相关技术的智能服务,诸如智能家居、智能建筑、智能城市、智能汽车、联网汽车、医疗保健、数字教育、智能零售、安全和安保服务。公开了一种在无线通信系统中操作用户设备UE的方法,其包括：确定车联万物(V2X)应用的数据传输速率要求并根据所需的数据传输速率获取数据速率信息；向基站发射数据速率信息并获取侧链路无线电链路控制(RLC)功能配置参数；以及向其它UE发射所获取的侧链路RLC功能配置参数。(The present disclosure relates to a communication method and system for fusing a fifth generation (5G) communication system supporting a higher data rate than a fourth generation (4G) system with internet of things (IoT) technology. The present disclosure may be applied to intelligent services based on 5G communication technologies and IoT related technologies, such as smart homes, smart buildings, smart cities, smart cars, networked cars, healthcare, digital education, smart retail, security and security services. Disclosed is a method of operating a user equipment, UE, in a wireless communication system, comprising: determining the data transmission rate requirement applied by the vehicle-mounted everything (V2X) and acquiring data rate information according to the required data transmission rate; transmitting data rate information to a base station and obtaining side link Radio Link Control (RLC) function configuration parameters; and transmitting the acquired side link RLC function configuration parameters to other UEs.)

1. A method performed by a first User Equipment (UE) in a wireless communication system, the method comprising:

receiving a first message including Radio Link Control (RLC) function configuration parameter information from a Base Station (BS); and

performing sidelink communications with the second UE based on the received RLC function configuration parameter information.

2. The method of claim 1, further comprising transmitting a SidelinkUEInformation message including data rate information to the BS for sidelink transmissions if the first UE is in an RRC _ connected state,

wherein the first message is a Radio Resource Control (RRC) message, an

Wherein the RLC function configuration parameter information is configured based on the data rate information included in the SidelinkUEinformation message.

3. The method of claim 1, wherein the first and second light sources are selected from the group consisting of,

wherein the first message is a System Information Block (SIB) message if the first UE is in RRC _ Inactive state or RRC _ Idle state, and

wherein the RLC function configuration parameter information is preconfigured while the first UE is in an out-of-coverage state.

4. The method of claim 1, wherein the first and second light sources are selected from the group consisting of,

wherein performing the side link communication comprises:

determining whether a condition for configuring a new sidelink radio bearer (SLRB) is satisfied;

transmitting a second RRC message to the second UE if the condition is satisfied;

receiving a third RRC message from the second UE in response to the second RRC message; and

performing the sidelink communication with the second UE.

5. A method performed by a Base Station (BS) in a wireless communication system, the method comprising:

transmitting a first message including Radio Link Control (RLC) function configuration parameter information to a first User Equipment (UE),

wherein the sidelink communication between the first UE and the second UE is performed based on the transmitted RLC function configuration parameter information.

6. The method of claim 5, further comprising receiving a SidelinkUEInformation message including data rate information from the first UE for a sidelink transmission with the first UE in an RRC _ connected state,

wherein the first message is a Radio Resource Control (RRC) message, an

Wherein the RLC function configuration parameter information is configured based on the data rate information included in the SidelinkUEinformation message.

7. The method of claim 5, wherein the first and second light sources are selected from the group consisting of,

wherein the first message is a System Information Block (SIB) message if the first UE is in RRC _ Inactive state or RRC _ Idle state, and

wherein the RLC function configuration parameter information is preconfigured while the first UE is in an out-of-coverage state.

8. A method performed by a second User Equipment (UE) in a wireless communication system, the method comprising:

receiving a second Radio Resource Control (RRC) message from the first UE;

transmitting a third RRC message to the first UE in response to the second RRC message; and

perform a sidelink communication with the first UE,

wherein the second RRC message is received if a condition for configuring a new sidelink radio bearer (SLRB) is satisfied.

9. A first User Equipment (UE), comprising:

a transceiver configured to transmit and receive at least one signal; and

a controller connected to the transceiver,

wherein the controller is configured to receive a first message including Radio Link Control (RLC) function configuration parameter information from a Base Station (BS), and perform a sidelink communication with a second UE based on the received RLC function configuration parameter information.

10. The first UE of claim 9,

wherein the controller is further configured to transmit a SidelinkUEInformation message including data rate information to the BS for sidelink transmission if the first UE is in an RRC _ connected state,

wherein the first message is a Radio Resource Control (RRC) message, an

Wherein the RLC function configuration parameter information is configured based on the data rate information included in the SidelinkUEinformation message.

11. The first UE of claim 9,

wherein the first message is a System Information Block (SIB) message if the first UE is in RRC _ Inactive state or RRC _ Idle state, and

wherein the RLC function configuration parameter information is preconfigured while the first UE is in an out-of-coverage state.

12. The first UE of claim 9, wherein the controller is further configured to:

determining whether a condition for configuring a new sidelink radio bearer (SLRB) is satisfied,

transmitting a second RRC message to the second UE if the condition is satisfied,

receiving a third RRC message from the second UE in response to the second RRC message, an

Performing the sidelink communication with the second UE.

13. A Base Station (BS), comprising:

a transceiver configured to transmit and receive at least one signal; and

a controller connected to the transceiver,

wherein the controller is configured to transmit a first message including Radio Link Control (RLC) function configuration parameter information to a first User Equipment (UE), and

wherein the sidelink communication between the first UE and the second UE is performed based on the transmitted RLC function configuration parameter information.

14. The BS of claim 13,

wherein the controller is further configured to receive a SidelinkUEInformation message including data rate information for a sidelink transmission from the first UE if the first UE is in an RRC _ connected state,

wherein the first message is a Radio Resource Control (RRC) message, an

Wherein the RLC function configuration parameter information is configured based on the data rate information included in the SidelinkUEinformation message.

15. A second User Equipment (UE), comprising:

a transceiver configured to transmit and receive at least one signal; and

a controller connected to the transceiver,

wherein the controller is configured to receive a second Radio Resource Control (RRC) message from a first UE, transmit a third RRC message to the first UE in response to the second RRC message, and perform sidelink communication with the first UE, and

wherein the second RRC message is received if a condition for configuring a new sidelink radio bearer (SLRB) is satisfied.

Technical Field

The present disclosure relates generally to a wireless communication system, and more particularly, to an apparatus and method for supporting configuration of a sidelink Radio Link Control (RLC) layer parameter required for data transmission by a direct communication bearer in a wireless communication system.

Background

In order to meet the ever-increasing demand for wireless data traffic since the deployment of fourth generation (4G) communication systems, efforts have been directed to developing improved fifth generation (5G) or quasi-5G communication systems, which are also referred to as "ultra-4G networks" or post Long Term Evolution (LTE) systems.

The 5G communication system is considered to be implemented in a millimeter wave (mmWave) frequency band (e.g., 60GHz band) of a higher frequency, thereby achieving a higher data rate. 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, large antenna technology are discussed in the 5G communication system.

Further, development of system network improvements in 5G communication systems is ongoing based on, for example, advanced small cells, cloud Radio Access Networks (RANs), ultra dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication and coordinated multipoint (CoMP), receive side interference cancellation.

In 5G systems, hybrid Frequency Shift Keying (FSK), Quadrature Amplitude Modulation (QAM), and Sliding Window Superposition Coding (SWSC) have also been developed as Advanced Coding Modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and Sparse Code Multiple Access (SCMA) as advanced access techniques.

Compared to conventional 4G systems, 5G systems are considering supporting more different services. For example, the most representative services may include ultra-wideband mobile communication service (enhanced mobile broadband (eMBB)), ultra-high reliable/low latency communication service (ultra-reliable and low latency communication (URLLC)), large-scale device-to-device communication service (large-scale machine type communication (mtc)), and next generation broadcast service (evolved multimedia broadcast/multicast service (eMBMS)). A system providing URLLC service may be referred to as a URLLC system, and a system providing eMBB service may be referred to as an eMBB system. The terms "service" and "system" may be used interchangeably.

Among these services, the URLLC service, which is a new service considered in the 5G system, requires ultra-high reliability, such as a packet error rate of about 10%, and low latency, such as about 0.5 milliseconds (msec), compared to other services, in contrast to the existing 4G system. To meet these stringent conditions, URLLC services may require the application of shorter Transmission Time Intervals (TTIs) than eMBB services, and various operating schemes employing this service are currently being considered.

The internet 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, which is a combination of IoT technology and big data processing technology through connection with a cloud server. Since IoT implementations require technical requirements such as "sensing technology", "wired/wireless communication and network infrastructure", "service interface technology", and "security technology", sensor networks, machine-to-machine (M2M) communication, and Machine Type Communication (MTC) have recently been studied.

Such IoT environments can provide intelligent internet technology services that create new value for human life by collecting and analyzing data generated between internet things. IoT may be applied in a variety of fields including smart homes, smart buildings, smart cities, smart cars or networked cars, smart grids, healthcare, smart appliances, and advanced medical services through the fusion and combination between existing information technology and various industrial applications.

Disclosure of Invention

Technical problem

Accordingly, various attempts have been made to apply the 5G communication system to the IoT network. For example, techniques such as sensor networks, MTC, and M2M communication may be implemented through beamforming, MIMO, and array antennas. The application of cloud RAN as the big data processing technology described above may also be considered as an example of 5G and IoT convergence.

In the 5G system, a radio interface scheme for providing services satisfying various quality of service (QoS) levels is being researched. For example, direct communication schemes for vehicle-to-anything (V2X) User Equipment (UE) have been proposed. V2X refers to all types of communication schemes that can be applied to road vehicles, and various additional services have become possible through integration with recently developed wireless communication technologies, in addition to the original security applications. However, there is a need in the art to further reduce communication time, increase reliability, and more efficiently support direct communication between UEs.

Problem solving scheme

According to an aspect of the disclosure, a method performed by a first User Equipment (UE) in a wireless communication system, the method comprising: receiving a first message including Radio Link Control (RLC) function configuration parameter information from a Base Station (BS); and performing sidelink communications with the second UE based on the received RLC function configuration parameter information.

In one embodiment, the method further includes transmitting a sidelink ueinformation message including data rate information to the BS for sidelink transmission if the first UE is in an RRC _ connected state, wherein the first message is a Radio Resource Control (RRC) message, and wherein the RLC function configuration parameter information is configured based on the data rate information included in the sidelink ueinformation message.

In one embodiment, wherein the first message is a System Information Block (SIB) message in a case where the first UE is in an RRC _ inactive state or an RRC _ idle state.

In one embodiment, the RLC function configuration parameter information is preconfigured, wherein the RLC function configuration parameter information is configured in advance, in case the first UE is in an out-of-coverage state.

In one embodiment, wherein performing the sidelink communications comprises: determining whether a condition for configuring a new sidelink radio bearer (SLRB) is satisfied; transmitting a second RRC message to the second UE if the condition is satisfied; receiving a third RRC message from the second UE in response to the second RRC message; and performing sidelink communications with the second UE.

According to another aspect of the present disclosure, a method performed by a Base Station (BS) in a wireless communication system includes transmitting a first message including Radio Link Control (RLC) function configuration parameter information to a first User Equipment (UE), wherein sidelink communication between the first UE and a second UE is performed based on the transmitted RLC function configuration parameter information.

According to another aspect of the present disclosure, a method performed by a second User Equipment (UE) in a wireless communication system, the method comprising: receiving a second Radio Resource Control (RRC) message from the first UE; transmitting a third RRC message to the first UE in response to the second RRC message; and performing sidelink communication with the first UE, wherein the second RRC message is received if a condition for configuring a new sidelink radio bearer (SLRB) is satisfied.

According to another aspect of the present disclosure, a first User Equipment (UE) includes: a transceiver configured to transmit and receive at least one signal; and a controller connected to the transceiver, wherein the controller is configured to receive a first message including Radio Link Control (RLC) function configuration parameter information from a Base Station (BS), and perform a sidelink communication with the second UE based on the received RLC function configuration parameter information.

According to another aspect of the present disclosure, a Base Station (BS) includes: a transceiver configured to transmit and receive at least one signal; and a controller connected to the transceiver, wherein the controller is configured to transmit a first message including Radio Link Control (RLC) functional configuration parameter information to a first User Equipment (UE), and perform a sidelink communication between the first UE and a second UE based on the transmitted RLC functional configuration parameter information.

According to another aspect of the present disclosure, a second User Equipment (UE) includes: a transceiver configured to transmit and receive at least one signal; and a controller connected to the transceiver, wherein the controller is configured to receive a second Radio Resource Control (RRC) message from the first UE, transmit a third RRC message to the first UE in response to the second RRC message, and perform sidelink communication with the first UE, and receive the second RRC message if a condition for configuring a new sidelink radio bearer (SLRB) is satisfied.

Advantageous effects of the invention

Aspects of the present disclosure are directed to solving at least the above problems and/or disadvantages and to providing at least the advantages described below.

Accordingly, an aspect of the present disclosure provides an apparatus and method for supporting vehicle communication service and data transmission, which achieve desired high reliability and low latency values by providing a method of performing communication between UEs through a direct communication scheme in a vehicle communication system.

Another aspect of the present disclosure provides a method of supporting a vehicle communication service requiring various quality of service (QoS) levels through direct communication between UEs, and a method of configuring RLC function parameters for direct communication between UEs in a vehicle communication system, thereby achieving a desired high speed, high reliability, and low latency value.

Drawings

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

fig. 1 illustrates a wireless communication system according to one embodiment;

fig. 2 illustrates a configuration of a BS in a wireless communication system according to one embodiment;

fig. 3 shows a configuration of a UE in a wireless communication system according to one embodiment;

fig. 4A shows a configuration of a communication unit in a wireless communication system according to an embodiment;

fig. 4B illustrates an example in accordance with one embodiment in which an analog beamforming unit of a communication unit uses a separate antenna array for each transmission path in a wireless communication system;

fig. 4C shows an example in which the analog beamforming units of the communication unit share an antenna array for the transmission path in the wireless communication system, according to an embodiment;

fig. 5A illustrates direct communication between UEs over a sidelink Radio Access Technology (RAT) according to a first embodiment; fig. 5B illustrates direct communication between UEs over a side link RAT according to a second embodiment;

fig. 5C shows direct communication between UEs over a side link RAT according to a third embodiment;

fig. 5D shows direct communication between UEs over a side link RAT according to a fourth embodiment;

fig. 6A illustrates a method by which a BS configures RLC function configuration parameters required for configuring a PC5 RRC connection between UEs, according to one embodiment;

fig. 6B illustrates a method by which a UE configures RLC function configuration parameters required for configuring a PC5 RRC connection, according to one embodiment;

fig. 7 illustrates a signal process for operating RLC function configuration parameters to apply to sidelink data, in accordance with one embodiment;

fig. 8A illustrates a method of a UE for measuring and reporting sidelink resource congestion, according to one embodiment;

fig. 8B illustrates a method of a UE for measuring and reporting sidelink resource congestion, according to one embodiment;

FIG. 9 illustrates a signaling process for configuring a sidelink resource allocation pattern, in accordance with one embodiment;

fig. 10A shows a signal flow for configuring a new PC5 RRC unicast connection between UEs, according to one embodiment;

fig. 10B shows a signal flow for transmitting and receiving V2X packets through preset PC5 RRC unicast connection configuration information, according to one embodiment;

fig. 10C shows a signal flow for configuring a new PC5 unicast-based SLRB, in accordance with one embodiment;

FIG. 11A illustrates a method of a UE for handling a source identifier update of a sidelink, according to one embodiment;

FIG. 11B illustrates a method of a UE for handling a source identifier update of a sidelink, according to one embodiment; and

FIG. 12 illustrates a signal process for handling a source identifier update for a sidelink in accordance with one embodiment.

Detailed Description

Hereinafter, embodiments of the present disclosure may be described with reference to the accompanying drawings. Accordingly, those of ordinary skill in the art will recognize that various modifications, equivalents, and/or alternatives to the embodiments described herein can be made without departing from the scope and spirit of the disclosure. With respect to the description of the figures, like parts may be labelled with like reference numerals. Descriptions of well-known functions and/or configurations are omitted for clarity and conciseness.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. Singular expressions may include plural expressions unless they differ in context. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. These terms, which are defined in commonly used dictionaries, can be interpreted as having a meaning that is the same as the context in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. In some cases, even terms defined in the present disclosure should not be construed to exclude embodiments of the present disclosure.

Hereinafter, the embodiments will be described based on hardware. However, embodiments include techniques that use both hardware and software, and thus may also include software.

The present disclosure relates to an apparatus and method for configuring RLC function parameters to support a V2X service through a direct communication protocol between UEs in a wireless communication system. In particular, the present disclosure describes techniques for satisfying QoS levels required for various V2X services, which are required for sidelink direct communication between V2X UEs in a wireless communication system, based on a method of the UE for configuring RLC parameters required to support high speed data transmission and high reliability.

Terms related to signals, terms related to channels, terms related to control information, terms related to network entities, and terms related to device elements, which are used in the following description, are used only for convenience of description. Accordingly, the present disclosure is not limited to such terms, and other terms having the same technical meaning may be used.

The present disclosure describes embodiments using terms from communication standards, such as the third generation partnership project (3GPP), but merely examples. The embodiments herein may be modified and applied to other communication systems.

A method of operating a UE in a wireless communication system may comprise: determining data rate information required by the V2X application; notifying the BS of the required data rate information; acquiring RLC function configuration parameters corresponding to the data rate information from the BS; notifying other UEs of the acquired RLC function configuration parameters; and performing direct communication-based data transmission and reception based on the acquired RLC function configuration parameters.

A UE device in a wireless communication system may include a transceiver and at least one processor functionally connected to the transceiver. The at least one processor may determine data rate information applied by the V2X through which the UE transmits and receives data in a direct communication mode, and may notify the BS of required data rate information and receive RLC function configuration parameters corresponding to the required data rate information from the BS. When the UE acquires RLC function configuration parameters corresponding to the data rate information, the at least one processor may notify other UEs of the RLC function configuration parameters.

Fig. 1 illustrates a wireless communication system according to one embodiment.

Fig. 1 shows a BS 110, a UE # 1120, and a UE # 2130 as some nodes using radio channels in a wireless communication system. Although fig. 1 shows only one BS, other BSs that are the same as or similar to the BS 110 may be further included. Although fig. 1 shows only two UEs, other UEs identical or similar to UE # 1120 and UE # 2130 may be further included.

BS 110 is a network infrastructure element that provides radio access to UE 120 and UE 130. BS 110 has a coverage defined in a predetermined geographic area based on the range over which signals can be transmitted and received. The BS 110 may be referred to as an "Access Point (AP)", "enodeb (enb)", "fifth generation (5G) node", "5G NodeB (NB)", "wireless point", or "transmission/reception point (TRP)", or using other terms having technical meanings equivalent thereto.

Each of UE # 1120 and UE # 2130 is used by a user and communicates with BS 110 through a radio channel. According to circumstances, at least one of the UE # 1120 and the UE # 2130 may operate without user participation. That is, at least one of the UE # 1120 and the UE # 2130 performs MTC and may not be carried by a user. Each of UE # 1120 and UE # 2130 may be referred to as "user equipment", "mobile station", "subscriber station", "remote terminal", "wireless terminal", or "user device", or using other terms having the same meaning, as well as "terminal".

BS 110, UE # 1120, and UE # 2130 may transmit and receive wireless signals in sub-bands of the 6 gigahertz (GHz) and millimeter wave frequency bands (e.g., 28GHz, 30GHz, 38GHz, and 60 GHz). To increase channel gain, BS 110, UE # 1120, and UE # 2130 may perform beamforming, which may include transmit beamforming and receive beamforming. That is, the BS 110, the UE # 1120, and the UE # 2130 may assign directivity to a transmission signal or a reception signal. Accordingly, BS 110 and UE 120 and UE 130 may select serving beams 112, 113, 121, and 131 through a beam search procedure or a beam management procedure. After the serving beams 112, 113, 121, and 131 are selected, communication may be performed through resources having a quasi-co-location (QCL) relationship with resources transmitting the serving beams 112, 113, 121, and 131.

The QCL relationship between the first antenna port and the second antenna port may be evaluated if a large characteristic of a channel used to transmit symbols through the first antenna port can be inferred from a channel used to transmit symbols through the second antenna port. For example, the large scale characteristic may include at least one of delay spread, doppler shift, average gain, average delay, and spatial receiver parameters.

Fig. 2 illustrates a configuration of a BS in a wireless communication system according to one embodiment.

The configuration shown in fig. 2 may be that of BS 110. The term "… … unit" or suffix such as "… … person" or "… … person" may indicate a unit that handles at least one function or operation and may be implemented by hardware, software, or a combination of hardware and software.

Referring to fig. 2, the BS includes a wireless communication unit 210, a backhaul communication unit 220, a storage unit 230, and a controller 240.

The wireless communication unit 210 performs a function for transmitting and receiving signals through a radio channel. For example, the wireless communication unit 210 performs a conversion function between a baseband signal and a bit stream according to a physical layer standard of the system. In data transmission, the wireless communication unit 210 may encode and modulate a transmission bit stream to generate complex symbols. In data reception, the wireless communication unit 210 reconstructs a received bit stream by demodulating and decoding a baseband signal.

Also, the wireless communication unit 210 up-converts a baseband signal into a Radio Frequency (RF) band signal transmitted through an antenna, and down-converts an RF band signal received through the antenna into a baseband signal. Accordingly, the wireless communication unit 210 may include, for example, 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). The wireless communication unit 210 may include a plurality of transmit/receive paths and at least one antenna array including a plurality of antenna elements.

In terms of hardware, the wireless communication unit 210 may include a digital unit and an analog unit. The analog unit may include a plurality of sub-units according to an operation power, an operation frequency, and the like. The digital unit may be implemented by at least one processor, such as a Digital Signal Processor (DSP).

The wireless communication unit 210 transmits and receives signals as described above. Accordingly, all or part of the wireless communication unit 210 may be referred to as a "transmitter," receiver, "or" transceiver. In the following description, transmission and reception performed through a radio channel may include the above-described processing of the wireless communication unit 210.

The backhaul communication unit 220 provides an interface for communicating with other nodes within the network. That is, the backhaul communication unit 220 converts a bit stream transmitted from the BS to other access nodes, other BSs, higher nodes, or a core network into a physical signal, and converts a physical signal received from the node into a bit stream.

The storage unit 230 may store data such as basic programs for the operation of the BS, application programs, and configuration information. The storage unit 230 may include at least one of volatile memory and non-volatile memory. The storage unit 230 provides the stored data in response to a request from the controller 240.

The controller 240 may control the overall operation of the BS. For example, the controller 240 transmits and receives signals through the wireless communication unit 210 or the backhaul communication unit 220. The controller 240 records and reads data in the storage unit 230. The controller 240 may perform the functions of a protocol stack required by a communication standard. According to other embodiments, the protocol stack may be included in the wireless communication unit 210. Accordingly, the controller 240 may include at least one processor.

Controller 240 may transmit RRC configuration information to UE 120 and UE 130. Controller 240 may transmit the sidelink configuration information to UE 120 and UE 130. For example, the controller 240 may control the BS to perform operations according to embodiments described below.

Fig. 3 shows a configuration of a UE in a wireless communication system according to one embodiment.

The configuration shown in fig. 3 may be that of UE # 1120 or UE # 2130. Referring to fig. 3, the UE includes a communication unit 310, a storage unit 320, and a controller 330.

The communication unit 310 performs a function for transmitting and receiving signals through a radio channel. For example, the communication unit 310 performs a conversion function between a baseband signal and a bit stream according to a physical layer standard of the system. In data transmission, the communication unit 310 encodes and modulates a transmission bit stream to generate complex symbols. In data reception, the communication unit 310 reconstructs a received bit stream by demodulating and decoding a baseband signal. The communication unit 310 up-converts a baseband signal into an RF band signal, transmits the RF band signal through an antenna, and then down-converts the RF band signal received through the antenna into a baseband signal. The communication unit 310 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, and an ADC.

The communication unit 310 may include a plurality of transmit/receive paths. The communication unit 310 may comprise at least one antenna array comprising a plurality of antenna elements. In terms of hardware, the communication unit 310 may include digital circuitry and analog circuitry, such as a Radio Frequency Integrated Circuit (RFIC). The digital circuitry and the analog circuitry may be implemented as a single package. The communication unit 310 may include a plurality of RF chains and may perform beamforming.

The communication unit 310 may comprise different communication modules for processing signals in different frequency bands. The communication unit 310 may comprise a plurality of communication modules for supporting a plurality of different radio access technologies. For example, the different radio access technologies may include Bluetooth^TMLow Energy (BLE), wireless fidelity (Wi-Fi), Wi-Fi gigabytes, and cellular networks, such as LTE. The different frequency bands may include the ultra high frequency (SHF) (e.g., 2.5GHz, 3.5GHz, and 5GHz) frequency band and the millimeter wave (e.g., 60GHz) frequency band.

Communication unit 310 transmits and receives signals and, thus, may be referred to as a "transmitter," receiver, "or" transceiver. The transmission and reception performed through the wireless channel may instruct the communication unit 310 to perform the above-described processing.

The storage unit 320 stores data such as basic programs, application programs, and configuration information for UE operation. The storage unit 320 may include at least one of volatile memory and non-volatile memory. The storage unit 320 provides the stored data in response to a request from the controller 330.

The controller 330 controls the overall operation of the UE. For example, the controller 330 transmits and receives signals through the communication unit 310. The controller 330 records and reads data in the storage unit 320. The controller 330 may perform the functions of a protocol stack required by a communication standard. Accordingly, the controller 330 may include at least one processor or microprocessor, or may be part of a processor. Portions of the communication unit 310 or the controller 330 may be referred to as a Communication Processor (CP).

The controller 330 may perform the following processes: determining data transmission requirements of a V2X application for performing sidelink direct communication between UE 120 and UE 130 and other UEs, notifying BS 110 of required data transmission information, receiving RLC function configuration parameters corresponding to the required data transmission information from the BS, providing the RLC function configuration parameter information to the other UEs, and processing data to be transmitted to the other UEs according to the RLC function configuration parameter information. For example, the controller 330 may control the UE to perform operations according to embodiments described below.

Fig. 4A illustrates a configuration of a communication unit in a wireless communication system according to one embodiment.

Referring to fig. 4A, the wireless communication unit 210 or the communication unit 310 includes a coding and modulation unit 402, a digital beam forming unit 404, a plurality of transmission paths 406-1 to 406-N, and an analog beam forming unit 408.

The coding and modulation unit 402 performs channel coding, for which at least one of a Low Density Parity Check (LDPC) code, a convolutional code, and a polar code may be used. The coding and modulation unit 402 generates modulation symbols by performing constellation mapping.

The digital beamforming unit 404 performs beamforming on the digital signal (e.g., modulation symbol). Accordingly, the digital beamforming unit 404 multiplies the beamforming weights by the modulation symbols. The beamforming weight values may be used to change the magnitude and phase of the signal and may be referred to as a "precoding matrix" or "precoder". Digital beamforming unit 404 outputs digitally beamformed modulation symbols over a plurality of transmission paths 406-1 through 406-N. According to the MIMO transmission scheme, modulation symbols may be multiplexed, or the same modulation symbol may be provided to a plurality of transmission paths 406-1 to 406-N.

The plurality of transmission paths 406-1 to 406-N convert the digital beamformed digital signals to analog signals. Accordingly, each of the plurality of transmission paths 406-1 to 406-N may include an Inverse Fast Fourier Transform (IFFT) calculator, a Cyclic Prefix (CP) inserter, a DAC, and an upconverter. The CP inserter is used for an Orthogonal Frequency Division Multiplexing (OFDM) scheme and may be omitted when other physical layer schemes (e.g., a filter bank multi-carrier (FBMC) scheme) are applied. That is, the multiple transmission paths 406-1 to 406-N provide independent signal processing for multiple streams generated by digital beamforming. However, depending on the implementation, some elements of the multiple transmission paths 406-1 to 406-N may be used in common.

The analog beamforming unit 408 performs beamforming on the analog signal. Accordingly, the digital beamforming unit 404 multiplies the beamforming weights by the analog signals. The beamforming weights are used to change the magnitude and phase of the signals. More specifically, the analog beamforming unit 408 may be configured as shown in fig. 4B or 4C according to a connection structure between the plurality of transmission paths 406-1 to 406-N and the antenna.

Fig. 4B shows a configuration of a communication unit in a wireless communication system according to one embodiment. Referring to fig. 4B, a signal input into the analog beamforming unit 408 may be transmitted through an antenna via phase/size conversion and amplification operations. The signals in each path are transmitted through a different antenna array (or set). In processing the signal input through the first path, the signal is converted into a signal sequence having the same or different phase/size by the phase/size conversion units 412-1-1 to 412-1-M, amplified by the amplifiers 414-1-1 to 414-1-M, and transmitted through the antenna.

Fig. 4C shows a configuration of a communication unit in a wireless communication system according to one embodiment.

Referring to fig. 4C, a signal input into the analog beamforming unit 408 is transmitted through an antenna via phase/size conversion and amplification operations. The signals in each path are transmitted through the same antenna array. In processing the signal input through the first path, the signal is converted into a sequence of signals having the same or different phases/sizes by the phase/size conversion units 412-1-1 to 412-1-M and amplified by the amplifiers 414-1-1 to 414-1-M. The amplified signals to be transmitted through one antenna are summed based on the antenna elements by the summing units 416-1 to 416-M and then transmitted through the antenna.

Fig. 4B shows an example in which a separate antenna array is used for each transmission path, and fig. 4C shows an example in which the transmission paths share one antenna array. However, some transmission paths may use separate antenna arrays, while the remaining transmission paths may share one antenna array. Further, by applying a switchable structure between the transmission path and the antenna array, a structure that can be adaptively changed according to circumstances may be used.

The V2X service can be classified into a basic security service and a high-level service. The basic safety service may correspond to a detailed service such as a vehicle notification (a Cooperation Awareness Message (CAM) or a Basic Safety Message (BSM)) service, a left turn notification service, a front collision warning service, an approaching emergency vehicle notification service, a front obstacle warning service, and an intersection signal information service, and may transmit and receive the V2X information through a broadcast, unicast, or multicast transmission scheme.

Advanced services have stricter QoS requirements compared to basic security services and require a scheme of transmitting and receiving V2X information through a unicast and broadcast transmission scheme instead of a broadcast transmission scheme in order to transmit and receive V2X information within a specific vehicle group or between two vehicles. Advanced services may correspond to detailed services such as queuing services, automated driving services, remote driving services, and extended sensor-based V2X services.

For V2X service, the UE may perform V2X service in ng-RAN (gnb) connected to the 5G core network or E-UTRAN (ng-eNB) connected to the 5G core network through the ng-RAN or the E-UTRAN. When a BS (ng-RAN or ng-eNB) is connected to an Evolved Packet Core (EPC) network, the V2X service may be performed by the BS. When the BS is connected to an Evolved Packet Core (EPC) network, the V2X service may be performed by the BS. The V2X radio interface communication scheme that can be used for direct communication between UEs may be at least one of a unicast, a multicast, and a broadcast scheme, and a method of managing and configuring radio communication parameters suitable for QoS requirements of V2X services should be provided when V2X transmission/reception is performed in each communication scheme.

A system is defined for performing direct communication between UEs based on LTE wireless communication, such that the transmitting UE selects and manipulates the parameters it needs for transmission. In case of LTE wireless communication, V2X service messages for basic security are transmitted between UEs through a direct communication scheme. The QoS requirements of the basic security V2X service are not strict, and even if there are a plurality of basic security services, the diversity of QoS requirements between services is low and the difference between services is small. Therefore, even in a mode in which the BS schedules radio resources for direct communication between UEs based on LTE wireless communication, the BS simply schedules the radio resources without acquiring detailed QoS requirement information of the V2X service, and the UEs manage and configure parameters.

Advanced V2X services have a variety of QoS requirements, and the QoS level of each V2X service may vary greatly. A particular advanced V2X service can only be performed if the radio resources and radio parameters used for direct communication are configured to meet the strict QoS requirements of the service. Therefore, a system supporting the advanced V2X service based on direct communication between UEs should provide a better method of guaranteeing QoS than the conventional system.

Fig. 5A shows direct communication between UEs over a side link RAT according to the first embodiment. In fig. 5A, UEs within coverage of the gbb perform direct communication. The resource allocation configuration parameter information to be used for transmitting and receiving the sidelink radio bearer of the V2X packet based on unicast, broadcast or multicast between the UEs may be transmitted to the UE 120 and the UE 130 through a system information message or an RRC dedicated message of the gNB 110 or may be previously configured in the UE 120 and 130. The UEs 120 and 130 performing direct communication through NR V2X SL may transmit data rate information required for V2X service packets to the gNB 110 and acquire sidelink resource allocation and/or RLC function configuration parameter information from the gNB 110. The side link RLC function configuration parameter information may be communicated to other UEs.

Fig. 5B illustrates direct communication between UEs over a side link RAT according to a second embodiment. In fig. 5B, UE 120 and UE 130 within the coverage of ng-eNB perform direct communication. The resource allocation configuration parameter information to be used for transmitting and receiving the sidelink radio bearer of the V2X packet based on unicast, broadcast or multicast between UEs may be transmitted to the UE 120 and the UE 130 through a system information message or an RRC dedicated message of the ng-eNB 110 or previously configured in the UE 120 and the UE 130. The UEs 120 and 130 performing direct communication through NR V2X SL may transmit data rate information required for V2X service packets to the ng-eNB 110 and acquire sidelink resource allocation and/or RLC function configuration parameter information from the ng-eNB 110. The side link RLC function configuration parameter information may be communicated to other UEs.

Fig. 5C shows direct communication between UEs over a side link RAT according to the third embodiment. In fig. 5C, a UE 120 in the coverage of the gNB and a UE 130 in the coverage of the gNB perform direct communication. The resource allocation configuration parameter information to be used for transmitting and receiving the sidelink radio bearer of the V2X packet based on unicast, broadcast or multicast between the UEs may be transmitted to the UEs 120 and 130 through a system information message or RRC dedicated message of the gNB 110 or may be previously configured in the UEs 120 and 130. The UEs 120 and 130 performing direct communication through NR V2X SL may transmit data rate information required for V2X service packets to the gNB 110 and acquire sidelink resource allocation and/or RLC function configuration parameter information from the gNB 110. The side link RLC function configuration parameter information may be communicated to other UEs.

Fig. 5D shows direct communication between UEs over a side link RAT according to a fourth embodiment. In fig. 5D, UE 120 and UE 130 within eNB coverage perform direct communication. The resource allocation configuration parameter information to be used for transmitting and receiving the sidelink radio bearer of the V2X packet based on unicast, broadcast or multicast between UEs may be transmitted to the UE 120 and the UE 130 through a system information message or an RRC dedicated message of the eNB 110 or may be previously configured in the UE 120 and the UE 130. The UEs 120 and 130 performing direct communication through the NR V2X SL may transmit data rate information required for V2X service packets to the eNB 110 and acquire sidelink resource allocation and/or RLC function configuration parameter information from the eNB 110. The side link RLC function configuration parameter information may be communicated to other UEs.

The sidelink RLC function configuration parameters for performing direct communication between UEs may be used to perform PC5 RRC signaling transmission/reception in unicast, V2X messages in unicast, V2X messages in broadcast, and V2X messages in multicast.

The sidelink direct communication may be used to perform PC5 RRC signaling transmission/reception for configuring and managing unicast connection between UEs, and transmit/receive V2X data that can be exchanged between UEs in a unicast manner, a multicast manner, and a broadcast manner. The configuration information required to perform the PC5 RRC signaling transmission/reception may include a function configuration parameter for each layer, such as Packet Data Convergence Protocol (PDCP), Radio Link Control (RLC), Medium Access Control (MAC), or Physical (PHY). The configuration information required for transmitting/receiving V2X data may include a function configuration parameter for each layer, such as PDCP, RLC, MAC, or PHY. The present disclosure describes a method of operating Sequence Number (SN) size and ARQ configuration parameters among RLC layer functions applied to PC5 RRC signaling and V2X data. The RLC layer function configuration parameter may be configured according to at least one of a determination method implemented by the UE, a pre-configuration method, a method configured by the BS (RRC dedicated signaling or V2X SIB signaling), and a method configured by the UE (PC5 RRC dedicated signaling, PC5 MIB, or PC5 SIB).

Fig. 6A illustrates a signaling procedure for operating RLC function configuration parameters to apply to a side link RRC according to one embodiment. Fig. 6A illustrates a method by which a BS configures RLC function configuration parameters required for configuring a PC5 RRC connection between UEs and informs the UEs thereof. The BS may instruct the configuration of RLC functions configuration parameters needed to configure the PC5 RRC connection and/or update the parameters to new values.

Referring to fig. 6A, in step 601, the UE # 1600 may determine that a PC5 RRC connection is required for a side link unicast connection with the UE # 2670, and initiate a PC5 RRC configuration procedure. In step 602, UE # 1600 may transmit a sidelinkue information message to inform BS 690 of PC5 RRC connection configuration. In step 603, the BS 690 may configure information received from the UE # 1600, i.e., the sidelink radio resources and configuration information required for the PC5 RRC connection configuration, based on the PC5 RRC connection configuration notification. In step 604, the BS 690 may transmit to the UE # 1600 a rrcconfiguration message or a RRCConnectionReconfiguration message including the information configured in step 603. The message in step 604 may include RLC function configuration parameter information required for the PC5 RRC connection. An embodiment of the RLC function configuration parameter information may include table 6, as shown below.

In step 605, the UE # 1600 may determine RLC function configuration parameter information for the RRC connection with the PC5 of the UE # 2670 based on the RLC function configuration parameter information received in step 604. UE # 1600 may notify UE # 2670 of RLC function configuration parameter information. In step 606, UE # 1600 and UE # 2670 may perform a PC5 RRC connection configuration procedure based on the RLC function configuration parameter information. A detailed description of the procedure for the PC5 RRC connection configuration is omitted. When the RLC function configuration parameter information is not received in step 604, the UE # 1600 and the UE # 2670 may perform the PC5 RRC connection configuration procedure based on the RLC function configuration parameter information set in the default configuration. One example of a default configuration is shown in table 1, below.

[ TABLE 1 ]

When transmitting and receiving the PC5 RRC connection configuration signaling according to the default configuration or the preset configuration, the UE #600 or the UE # 2670 may receive an rrcrecconfiguration message, an RRCConnectionReconfiguration message, or a V2X SIB, the V2X SIB including RLC function configuration parameter information for the PC5 RRC. This procedure may correspond to step 604, and an embodiment of RLC function configuration parameter information may include table 6, as shown below. UE # 1600 and UE # 2670 may transmit and receive PC5 RRC connection configuration signaling according to the new RLC function configuration parameters for PC5 RRC. UE # 1600 and UE # 2670, which acquire new RLC function configuration parameters for PC5 RRC, may notify the counterpart UE (UE #1 or UE #2) of the new RLC function configuration parameters. The PC5 RRC signaling including the new RLC function configuration parameters for the PC5 RRC may be transmitted and received by applying the previously used RLC function configuration parameters (or default configuration). The new RLC function configuration parameters for PC5 RRC may be applied after the PC5 RRC complete signaling corresponding to the PC5 RRC signaling. For example, PC5 RRC signaling may include AS configuration and AS configuration completion. This process may correspond to step 606.

Fig. 6B illustrates a signaling procedure for operating RLC function configuration parameters to apply to side link RRC according to one embodiment.

Fig. 6B illustrates a method by which the UE configures RLC function configuration parameters required for configuring the PC5 RRC connection and notifies the counterpart UE of the parameters. The UE may indicate the configuration of RLC function configuration parameters needed to configure the PC5 RRC connection and/or update the parameters to new values.

Referring to fig. 6B, in step 621, the UE # 1600 may determine that a PC5 RRC connection is required for a side link unicast connection with the UE # 2670, and initiate a PC5 RRC configuration procedure. In step 622, UE # 1600 may transmit a sidelinkue information message to inform BS 690 of PC5 RRC connection configuration. In step 623, the BS 690 may configure information received from the UE # 1600, i.e., the sidelink radio resource and configuration information required for the PC5 RRC connection configuration, based on the PC5 RRC connection configuration notification. In step 624, the BS 690 may transmit to the UE # 1600 an rrcconfiguration message and an RRCConnectionReconfiguration message including the information configured in step 623. In step 625, the UE # 1600 may determine RLC function configuration parameter information for the PC5 RRC with the UE # 2670, and the sidelink radio resources and configuration information received in step 624. UE # 1600 may notify UE # 2670 of RLC function configuration parameter information.

An embodiment of the RLC function configuration parameter information may include table 6, as shown below. In step 626, UE # 1600 and UE # 2670 may perform a PC5 RRC connection configuration procedure based on the RLC function configuration parameter information for the PC5 RRC. A detailed description of the procedure for the PC5 RRC connection configuration is omitted.

In step 625, the UE # 1600 may determine to use the default configuration of table 1 as the RLC function configuration parameters for the PC5 RRC with the UE # 2670. At this time, UE # 1600 and UE # 2670 may perform the PC5 RRC connection configuration procedure based on the RLC function configuration parameter information set in the default configuration of table 1.

Alternatively, UE #1 and UE #2 may determine a change in the RLC function configuration parameters at the time of transmitting and receiving the PC5 RRC connection configuration signaling according to a default configuration or a preset configuration, which may correspond to step 625. UE #1 and UE #2 may transmit PC5 RRC signaling including new RLC function configuration parameter information to the counterpart UE, which also includes table 6. The PC5 RRC signaling including the new RLC function configuration parameters for the PC5 RRC may be transmitted and received by applying the previously used RLC function configuration parameters (or default configuration). The new RLC function configuration parameters for PC5 RRC may be applied after the PC5 RRC complete signaling corresponding to the PC5 RRC signaling. For example, PC5 RRC signaling may include AS configuration and AS configuration complete, which may correspond to step 626.

The RLC function configuration parameters that may be applied to transmission/reception of PC5 signaling (e.g., signaling SLRB) may include at least one piece of information in table 2, table 3, table 4, table 5, and table 6, as shown below.

[ TABLE 2 ]

RLC mode	RLC UM mode	RLC AM mode
			SN size	6 bit and 12 bit	12 bit and 18 bit

The RLC function configuration parameters that may be applied to transmission/reception of V2X data (e.g., data SLRB) may include at least one piece of information of table 3, table 4, table 5, and table 6, as shown below.

[ TABLE 3 ]

RLC mode	RLC UM mode	RLC AM mode
			SN size	6 bit and 12 bit	12 bit and 18 bit
ARQ parameters		PollByte value PollPDU value

The RLC function configuration parameters according to table 3 above may be applied to each unicast-based sidelink SLRB, each broadcast-based sidelink SLRB, or each multicast-based sidelink SLRB. The RLC function configuration parameter may be configured by following at least one of a UE-implemented method, a preset method, a BS-configured method, and a UE-configured method.

Fig. 7 illustrates a signal process for operating RLC function configuration parameters to apply to sidelink data, according to one embodiment.

Referring to fig. 7, in step, UE # 1700 may determine a unicast-based sidelink V2X data transmission with UE # 2770. In step 702, UE # 1700 may transmit a sidelink ueinformation message to inform BS 790 of the unicast-based sidelink V2X data transmission. The information provided via the sildelinkueinformation message may include a desired data rate.

The information provided through the sildelinkueinformation message may include at least one parameter in table 4 and table 5 as shown below, at least one piece of information on unicast, multicast, and broadcast, and at least one of a destination identifier, a ProSeQos indicator (PQI), a QoS Flow Identifier (QFI), required reliability information, and required latency information. The BS 790 may configure information received from the UE # 1700, i.e., the sidelink radio resources and configuration information required for unicast-based sidelink data transmission/reception, on the basis of the unicast-based sidelink V2X data transmission notification. The BS 790 may configure RLC function configuration parameters with reference to at least one of a transmission type, a destination identifier, PQI, QFI, required reliability information, required latency information, and required data rate provided by the UE. Examples of the RLC function configuration parameter may include at least one parameter of table 3 as shown above and table 6 as shown below.

In step 704, the BS 790 may transmit to the UE # 1700 a rrcconnectionconfiguration message or a RRCConnectionReconfiguration message including the information configured in step 703. The message in step 704 may include RLC function configuration parameter information required for unicast-based sidelink data transmission/reception. In step 705, the UE # 1700 may determine RLC function configuration parameter information for unicast side link data transmission/reception with the UE # 2770 based on the RLC function configuration parameter information received in step 704. The RLC function configuration parameter information may include table 3, table 4, table 5, and table 6, as shown below. In step 706, UE # 1700 and UE # 2770 may perform parameter configuration for sidelink unicast data transmission, which includes RLC function configuration parameters for unicast-based sidelink data transmission/reception.

The information (i.e., V2X data to be transmitted/received in a sidelink) through which the UE informs the BS of data rate information required for the V2X application may include at least one piece of information shown in table 4, as follows.

[ TABLE 4 ]

In table 4, the data rate information may be indicated by a data rate index or a data rate value.

The data rate value may be the value of the data rate required for each V2X application.

The data rate index may be an index of the data rate required for each V2X application. In view of the V2X application, all available data rates are divided into data rates of predetermined portions, and an index is assigned to each portion. The data rate index may be configured as shown in table 5 below.

[ TABLE 5 ]

The SN size in table 3 and/or an ARQ parameter (e.g., PollPDU or PollByte) in the RLC function configuration parameters may be determined with reference to the data rate information.

The RLC function configuration parameter may include at least one piece of information in table 6, as shown below.

RX-AM-RLC may correspond to RLC function configuration parameters to be used by the receiving UE in RLC AM mode, TX-AM-RLC may correspond to transmit RLC function configuration parameters to be used by the transmitting UE in RLC AM (acknowledged mode), RX-UM-RLC may correspond to receive RLC function configuration parameters to be used by the receiving UE in RLC UM (unacknowledged mode), and TX-UM-RLC may correspond to RLC function configuration parameters to be used by the transmitting UE in RLC UM mode.

[ TABLE 6 ]

Alternatively, the configured RLC function configuration parameter may be changed, which may be determined by the BS or the UE (UE #1 or UE # 2). The RLC function configuration parameter that needs to be changed may be transmitted to the counterpart UE (UE #1 or UE # 2).

The BS may manage mapping information between data rate information and information required to configure RLC function configuration parameters, such as an SN size in an RLC AM mode, an SN size in an RLC UM mode, and an ARQ parameter configuration (e.g., PollByte or PollPDU), based on data rate information required by the UE. The mapping information may be provided to the BS by the V2X server.

Fig. 7 illustrates that when the UE is in an RRC _ connected state, the embodiment in which the UE is in an RRC _ idle state or an RRC _ inactive state and/or the UE exceeds the coverage area may include at least one of the following.

(1) The RLC function configuration parameter information may be included in the V2X SIB message transmitted by the BS. The RLC function configuration parameter information included in the V2X SIB message may include at least one parameter in table 7 and table 8, as shown below. The dataRateIndex included in tables 7 and 8 can be referred to table 5.

[ TABLE 7 ]

[ TABLE 8 ]

(2) The RLC function configuration parameter information may be pre-configured and may include at least one parameter of table 9 and table 10, as shown below. The dataRateIndex included in tables 9 and 10 can be referred to table 5.

[ TABLE 9 ]

[ TABLE 10 ]

The UE in the RRC _ inactive state or the UE in the RRC _ idle state may receive the V2X SIB message including table 7 and table 8 from the BS and acquire RLC function configuration parameter information. The UE in the RRC _ inactive state or the UE in the RRC _ idle state may acquire the preconfigured RLC function configuration parameter information of tables 9 and 10. The out-of-coverage UE may acquire the preconfigured RLC function configuration parameter information of tables 9 and 10.

When the dataRateIndex is included in table 7, table 8, table 9, and table 10, the RLC function configuration parameter of the dataRateIndex corresponding to the required data rate may be applied.

When the dataRate is included in table 7, table 8, table 9, and table 10, the RLC function configuration parameter of the dataRate corresponding to the required data rate may be applied.

When the thresDataRate is included in tables 7, 8, 9, and 10, the RLC function configuration parameter may be applied only when the required data rate is less than the thresDataRate. Alternatively, when the thresDataRate is included in tables 7, 8, 9, and 10, the RLC function configuration parameter may be applied only when the required data rate is greater than the thresDataRate.

The RLC function configuration parameters may be configured as a set of parameters as shown in table 11 below, and the parameters included in each set may include at least one parameter of table 6, table 7, table 8, table 9, and table 10.

[ TABLE 11 ]

When the BS performs configuration in the UE, an index of the RLC function configuration parameter set may be indicated. When the UE notifies the counterpart UE of the RLC function configuration parameter configured in advance or selected by itself, an index of the RLC function configuration parameter set may be indicated. The RLC function configuration parameter set of table 11 may be indicated and/or configured to be linked with data rate information. For example, a set of RLC function configuration parameters corresponding to data rate a may be indicated and/or configured. The RLC function configuration parameter set corresponding to data rate index B may be indicated and/or configured. For example, a set of RLC function configuration parameters corresponding to data rate C may be indicated and/or configured.

When configuring the RLC function configuration parameter information according to the UE implementation, the UE may manage the information in tables 4 to 11 and configure RLC function configuration parameters, such as SN size and/or ARQ parameters, based on data rate information required for V2X data.

When configuring RLC function configuration parameters for transmitting and receiving broadcast-based sidelink V2X data and/or configuring RLC function configuration for transmitting and receiving multicast-based sidelink V2X data, a configuration method by RRC signaling of the BS, a pre-configuration method, a configuration method by PC5 signaling of the UE, and a configuration method implemented by the UE may be applied, as shown in fig. 7. Tables 4 to 11 can also be applied.

Fig. 8A illustrates a method of a UE for measuring and reporting side link resource congestion, according to one embodiment. To determine the usage status of the sidelink resources (e.g., sidelink resource congestion status), the BS may request measurements from the UE and report congestion of the sidelink resource pool. The UE may be in RRC _ connected state. The BS may instruct the UE to configure measurement and reporting of congestion through rrcreeconfiguration message or RRCConnectionReconfiguration message. The configuration of the measurement and reporting of congestion may include at least one of event-based reporting and periodic reporting, and at least one sidelink resource pool information to be measured and reported.

When the BS supports configuration and allocation of LTE sidelink resources and/or configuration and allocation of NR sidelink resources, the BS may instruct the UE to measure and report congestion of the LTE sidelink resource pool and/or the NR sidelink resource pool. The BS may instruct the UE to measure and report congestion of a sidelink resource pool of the secondary RAT. When the UE is instructed to measure and report congestion of the sidelink resource pool of the secondary RAT, the UE may measure the congestion by a congestion measurement scheme of the secondary RAT and report the congestion according to the configured reporting scheme. Since an LTE-based channel occupancy (CBR) measurement and reporting scheme and an NR-based CBR measurement and reporting scheme may be differently defined, the UE needs to know indication information indicating whether to follow the LTE scheme or the NR scheme.

Referring to fig. 8A, in step 801, a UE may receive configuration of SL measurement and reporting of congestion of a contralateral link resource pool from a BS. In step 802, the UE may determine whether the configuration includes a configuration for measurement and reporting of congestion of the LTE sidelink resource pool. When the configuration includes a configuration for measurement and reporting of congestion for the LTE sidelink resource pool based on the determination in step 802, the UE may measure congestion for the LTE sidelink resource pool and report the congestion according to the reporting configuration in step 803. The procedure of measuring and reporting congestion of the LTE side link resource pool may correspond to the CBR measurement and reporting procedure defined in LTE-V2X.

In step 804, the UE may determine whether the configuration in step 801 includes a configuration for measurement and reporting of congestion of the NR side link resource pool. When the configuration is found to include a configuration of measurement and reporting of congestion of the NR side link resource pool based on the determination in step 804, the UE may measure congestion of the NR side link resource pool and report the congestion according to the reporting configuration in step 805. The procedure for measuring and reporting NR side link resource pool congestion may correspond to the CBR measurement and reporting procedure defined in NR-V2X.

The CBR measurement and reporting procedure defined in NR-V2X may include operational procedures for determining NR side link frame structure, resource structure, Reference Signal (RS), and resource pool congestion, and may be different from the procedure defined in LTE-V2X. When the configuration does not include a configuration for measurement and reporting of congestion of the LTE sidelink resource pool based on the determination in step 802, the UE may proceed to step 804. The UE may end the process when it is found, based on the determination in step 804, that the configuration does not include a configuration for measurement and reporting of congestion of the NR side link resource pool.

Fig. 8B illustrates a method for a UE to measure and report side link resource congestion, according to one embodiment.

Referring to fig. 8B, in step 821, the UE may receive configuration of SL measurement and reporting of congestion of the contralateral link resource pool from the BS. In step 822, the UE may determine whether the configuration includes a configuration for measurement and reporting of congestion of the LTE sidelink resource pool. When the configuration includes a configuration for measurement and reporting of congestion for the LTE sidelink resource pool based on the determination in step 822, the UE may measure congestion for the LTE sidelink resource pool and report the congestion according to the reporting configuration in step 823. The procedure of measuring and reporting congestion of the LTE side link resource pool may correspond to the CBR measurement and reporting procedure defined in LTE-V2X.

In step 821, the UE may determine whether the configuration in step 822 includes a configuration for measurement and reporting of congestion of the NR side link resource pool. When the configuration includes a configuration for measurement and reporting of congestion of the NR side link resource pool based on the determination in step 822, the UE may measure congestion of the NR side link resource pool and report the congestion according to the reporting configuration in step 824. The procedure of measuring and reporting congestion of the NR side link resource pool may correspond to the CBR measurement and reporting procedure defined in NR-V2X, which may include operational procedures for determining NR side link frame structure, resource structure, Reference Signal (RS) and resource pool congestion, and may be different from the procedure defined in LTE-V2X.

The information transmitted by the BS to the UE in step 801 and step 821, indicating the configuration of measurement and reporting of congestion of the LTE resource pool and the NR resource pool, may include at least one parameter of table 12, table 13, and table 14, as shown below.

(1) Side Link resource pools for which congestion is measured and for which reports can be configured for each of LTE and NR (see Table 12)

(2) RAT identifier indicating whether a sidelink resource pool for which congestion is measured and for which LTE or NR configuration reporting can be included (see Table 13)

(3) Congestion measurement and reporting configuration IEs may be configured for each of LTE and NR (see Table 14)

The UE may determine the LTE configuration or the NR configuration according to (1), (2), or (3), and may perform the LTE-based CBR measurement and reporting for the corresponding sidelink resource pool or the NR-based CBR measurement and reporting for the corresponding sidelink resource pool. Table 12 is as follows.

[ TABLE 12 ]

As shown in table 12, configurations for LTE sidelink resource pools and NR sidelink resource pools to which CBR measurements and reports are applied may be included. Table 13 is as follows.

[ TABLE 13 ]

As shown in table 13, RAT type information for distinguishing LTE sidelink resource pool and NR sidelink resource pool to which CBR measurement and reporting is applied may be included. Table 14 is as follows.

[ TABLE 14 ]

As shown in table 14, the CBR measurement reporting configuration information may include separate CBR measurement and reporting configuration IEs for each of LTE and NR.

Fig. 9 shows a signaling procedure for configuring a sidelink resource allocation pattern, according to one embodiment.

The sildelinkueinformation message and/or the UEAssistanceInformation message transmitted when the UE notifies the BS of the sidelink information may include at least one of sidelink resource allocation patterns (BS scheduling pattern 1 and UE scheduling pattern 2) in which the UE is interested and sidelink RAT information (LTE RAT, NR RAT, LTE, and NR RAT) in which the UE is interested.

As shown below, table 15 shows the sidelink ueinformation message including sidelink resource allocation pattern information and sidelink RAT information of interest to the UE. The sidelink resource allocation pattern information and/or sidelink RAT information of interest to the UE may also be included in the ueassistance information message.

[ TABLE 15 ]

The BS receiving the sidelink resource allocation mode information and/or the sidelink RAT information in which the UE is interested may indicate the sidelink resource allocation and configuration to the UE through an rrcreeconfiguration message or an RRCConnectionReconfiguration message with reference to the information in which the UE is interested.

Table 16 shows configuration information of the BS, which includes at least one of sidelink resource allocation mode information (mode 1, mode 2, or mode 1 and mode 2) indicated to the UE, a destination ID list (unicast, multicast, and broadcast destination IDs), a transmission type indicator that may be included when it is difficult to identify a transmission type only by the destination ID, an SLRB ID list (unicast, multicast, and broadcast SLRB IDs), and a RAT type (LTE RAT, NR RAT, LTE, and NR RAT). Table 16 is as follows.

[ TABLE 16 ]

Referring to fig. 9, in step 901, the UE # 1900 may determine whether a packet is generated in the V2X application, and may determine at least one of a transmission type, a RAT type, and a sidelink resource allocation pattern corresponding to the packet of the V2X application. The transmission type may correspond to unicast, multicast or broadcast. The RAT type may correspond to at least one of LTE and NR. The sidelink resource allocation pattern may correspond to at least one of pattern 1 and pattern 2.

In step 902, the UE # 1900 may inform the BS 990 of at least one of the transmission type, RAT type, and sidelink resource allocation mode of interest to the UE, as shown above in table 15. The message transmitted by the UE # 1900 to the BS 990 in step 902 may include at least one of a sildelinkueinformation message or a UEAssistanceInformation message. In step 903, the BS 990 may configure the sidelink resource allocation and configuration information of the UE based on the information of interest to the UE.

In step 904, the BS 990 may transmit the sidelink resource allocation and configuration information to the UE, as shown in table 16. The message transmitted by the BS 990 to the UE # 1900 in step 904 may include at least one of an RRCConnectionReconfiguration message or an RRCConnectionReconfiguration message. In step 905, the UE # 1900 can perform a V2X packet transmission/reception procedure according to the received configuration information.

A method of operating SLRB configuration based on PQL, QFI and QoS requirements applied by V2X will now be described with reference to fig. 10. V2X application packet transmission/reception may be performed in the same SLRB when the PQI, QFI and QoS requirements are the same or compatible for V2X packets generated in one or more V2X applications. When PQI, QFI and QoS requirements are different for V2X packets generated in one or more V2X applications, the SLRB corresponding to each PQI or QFI may be configured separately and V2X application packet transmission/reception may be performed.

Figure 10A illustrates a signal process for operating a sidelink bearer according to one embodiment. Fig. 10A shows the signal flow for configuring a new PC5 RRC unicast connection between UEs.

Referring to fig. 10A, in step 1001, the UE # 11000 may determine generation of a V2X packet corresponding to a V2X application and determine a transmission type of a V2X packet. When the transmission type of the V2X packet is unicast, in step 1002, the UE # 11000 can recognize whether a preset sidelink PC5 RRC configuration can be used. When it is determined in step 1003 that the V2X grouping requires a new sidelink PC5 RRC configuration, in step 1004, the UE # 11000 may perform PC5 RRC connection configuration and SLRB configuration procedures with the UE # 21090. In step 1005, UE # 11000 may determine to transmit V2X packets to the configured SLRB, and in step 1006, may transmit V2X packets to UE # 21090 through the configured SLRB.

Fig. 10B illustrates a signal procedure for operating a sidelink bearer according to one embodiment, i.e., a signal flow for transmitting and receiving V2X packets through preset PC5 RRC unicast connection configuration information when V2X packets for the same V2X application are generated between UEs.

Referring to fig. 10B, in step 1021, UE # 11000 and UE # 21090 may have PC5 RRC configuration and SLRB configuration. In step 1022, the UE # 11000 may determine generation of a V2X packet corresponding to the V2X application and determine a transmission type of the V2X packet. When the transmission type of the V2X packet is unicast, the UE # 11000 may determine whether the V2X packet belongs to the SLRB of the preset sidelink PC5 RRC in step 1023. When it is determined in step 1024 that the V2X packet can be transmitted through the preset SLRB, in step 1025, the UE # 11000 can transmit the V2X packet to the UE # 21090 through the configured SLRB.

Fig. 10C shows a signal procedure for operating a sidelink bearer according to one embodiment, i.e. showing a signal flow for configuring a new unicast-based PC5 SLRB when generating a V2X packet for a new V2X application between UEs.

Referring to fig. 10C, in step 1041, UE # 11000 and UE # 21090 may have PC5 RRC configuration and SLRB configuration. In step 1042, the UE # 11000 may determine the generation of V2X packets corresponding to the V2X application and determine the transmission type of the V2X packets. When the transmission type of the V2X packet is unicast, the UE # 11000 may determine whether the V2X packet belongs to an SLRB of the preset sidelink PC5 RRC in step 1043. When it is determined in step 1044 that the V2X packet cannot be transmitted through the preset SLRB, the UE # 11000 may determine the necessity of a new SLRB configuration for transmitting the V2X packet. In step 1045, UE # 11000 and UE # 21090 may perform a side link PC5 RRC configuration procedure for the new SLRB configuration. In step 1046, UE # 11000 may transmit V2X packet to UE # 21090 by configuring SLRB.

Although fig. 10A, 10B, and 10C only show signal flows between two UEs for performing a PC5 RRC connection configuration procedure and an SLRB configuration procedure using a PC5 RRC connection, when PC5 RRC connection configuration and SLRB configuration information are received from a BS, a signal flow with the BS may be defined.

Fig. 11A illustrates a method of a UE for handling a source identifier update of a sidelink according to one embodiment. For example, on the peer UE side for performing side link unicast, the destination identification (DST ID) and the source identification (SRC ID) may be the same.

SRC ID of UE # 1-DST ID of UE #2

SRC ID of UE #2 ═ DST ID of UE #2

The sidelink-based V2X system should be able to change the SRC ID in order to prevent problems with tracking the source UE. In the case of sidelink unicast, since the SRC ID of a UE may correspond to the DST ID of a peer UE, there may be a problem of changing the DST ID. Since the change of SRC ID and DST ID can be interpreted as an indication of a new PC5 RRC connection, two UEs connected by unicast should be able to distinguish when the SRC ID and DST ID need to be changed and when a new PC5 RRC connection or a new PC5 SLRB configuration is needed. When the SRC ID and DST ID change, the regular PC5 RRC connection may be maintained. When the SRC ID and DST ID change, the normal PC5 SLRB configuration may be maintained.

The UE having the changed SRC ID may provide notification of the change of SRC ID from an upper layer of the UE to an RRC layer, and may notify a counterpart UE of the need for the change of DST ID. The UE requiring the new PC5 RRC connection may provide notification of the necessity of the new PC5 RRC connection from the upper layer of the UE to the RRC layer. The UE may inform the opposing UE that a new PC5 RRC connection is needed. Alternatively, the UE having the new PC5 SLRB configuration may provide notification of the necessity of the new PC5 SLRB configuration from the upper layer of the UE to the RRC layer. The UE may inform the opposing UE that a new PC5 configuration is required. A UE with a side-link unicast connection may manage SLRB ID, SRC ID, and DST ID mapping information. A UE with a sidelink unicast connection may manage the list of SLRB IDs mapped to the PC5 RRC. A UE with a sidelink unicast connection may manage the SRC ID and DST ID information mapped to the PC5 RRC.

Referring to fig. 11A, in step 1102, the UE may determine whether a new PC5 RRC connection configuration is indicated while maintaining a PC5 RRC connection in step 1101. When a new PC5 RRC connection configuration is indicated according to the determination in step 1102, the UE may perform a new PC5 RRC connection configuration procedure in step 1104. When a change of the SRC ID (source ID) is indicated according to the determination in step 1103, the UE may perform an SRC ID change procedure being used for a regular PC5 RRC connection in step 1105. Steps 1102 and 1103 may relate to information indicated from an upper layer of one UE to an RRC layer, and the information may be indicated through a PC5 RRC connection between two UEs.

Fig. 11B illustrates a method of a UE for handling a source identifier update of a sidelink according to one embodiment.

Referring to fig. 11B, in step 1122, the UE may determine whether a new PC5 SLRB configuration is indicated while maintaining the PC5 RRC connection in step 1121. When a new SLRB configuration is indicated according to the determination in step 1122, the UE may perform a new SLRB configuration procedure in step 1124. When the change of the SRC ID is indicated according to the determination in step 1123, the UE may perform an SRC ID change procedure for the normal SLRB in step 1125. When the change of the SRC ID is not indicated according to the determination in step 1123, step 1121 is repeated. Steps 1122 and 1123 may correspond to an internal procedure of one UE, which is a new SLRB configuration indication and RRC ID change indication from an upper layer to an RRC layer, and may be a new SLRB configuration indication and SRC ID change indication configured by a PC5 RRC connection between two UEs RRC-unicast connected via a PC 5.

Fig. 11A and 11B may be performed by two UEs connected by a sidelink unicast.

FIG. 12 illustrates a signal process for handling a source identifier update for a sidelink in accordance with one embodiment.

Referring to fig. 12, in step 1201, UE # 11200 and UE # 21270 may have PC5 RRC unicast connection. The SLRB configured by the PC5 RRC unicast connection may correspond to SLRB 1. On the UE # 11200 side, the SRC ID is 10 and DST ID is 20, and on the UE # 21270 side, the SRC ID is 20 and DST ID is 10. In step 1202, the UE # 11200 may determine the necessity of a new PC5 RRC unicast connection or the necessity of a new SLRB configuration. In steps 1203 and 1204, the UE # 11200 and UE # 21270 may perform the PC5 RRC unicast connection configuration and the new SLRB configuration. Through the procedures in steps 1203 and 1204, in step 1205, UE # 11200 and UE # 21270 may have SLRB 2.

In step 1206, UE # 21270 may determine the necessity to change its own SRC ID for SLRB 1, which is the DST ID of UE # 11200. In steps 1207 and 1208, the UE # 21270 and the UE # 11200 may perform a procedure for changing the DST ID of the UE 1 (i.e., the SRC ID of the UE #2) for the SLRB 1. After steps 1207 and 1208, in step 1209, the UE # 11200 and UE # 21270 may configure the SRC ID-10 and DST ID-30 on the UE #1 side, and configure the SRC ID-30 and DST ID-10 according to the SLRB 1 on the UE #2 side.

A method of operating a sidelink Logical Channel Priority (LCP) may include at least one of the following methods.

The method comprises the following steps: the priority information corresponding to a sidelink logical channel of a V2X packet or V2X flow may use a default priority value of 5 QI for a V2X packet or V2X flow. An example of 5 QIs is shown in table 17 below. The PQI that may be applied to the V2X sidelink may be derived based on 5 QI, and the priority of the PQI may be configured to follow a default priority value. Alternatively, the priority of the PQI may be configured based on a default priority value.

The AS layer of the UE may determine a priority value of a logical channel corresponding to the V2X flow or the V2X packet according to the priority of the PQI of the V2X flow or the V2X packet, and perform LCP according to the priority. For example, assume that the higher the priority value, the lower the priority. Logical channels corresponding to V2X flows or V2X packets having a high priority (having a low priority value) can be scheduled with priority. The PC5 RRC may have a higher priority than the V2X packets. Table 17 is as follows.

[ TABLE 17 ]

The method 2 comprises the following steps: the V2X layer may configure priority values applicable to V2X packets or V2X flows. The operation of the priority values assigned to the V2X packets or V2X flows may follow the rules of the upper layer. The AS layer of the UE may determine priorities of logical channels corresponding to V2X flows or V2X packets based on priority values of the V2X flows or V2X packets, and may perform LCP according to the priorities.

For example, assume that the higher the priority value, the lower the priority. Logical channels corresponding to V2X flows or V2X packets having a high priority (having a low priority value) can be scheduled with priority. The PC5 RRC may have a higher priority than the V2X packets.

A method of selecting a sidelink resource pool for direct link setup between UEs of a higher layer and/or PC5 RRC connection setup between UEs may include at least one of the following methods.

(1) The broadcast pool is used until PC5 RRC connection setup is complete and then the unicast pool is used for V2X data traffic.

(2) The unicast pool is used for the entire direct link setup procedure, which includes PC5 RRC connection establishment.

(3) The broadcast pool is used prior to PC5 RRC connection setup signaling.

(4) The broadcast pool is used before the PC5 RRC connection setup signaling that requires HARQ feedback.

The methods disclosed according to the embodiments described herein may be implemented by hardware, software, or a combination of hardware and software.

When the method is implemented by software, a computer-readable storage medium for storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors within the electronic device. The at least one program may include instructions that cause an electronic device to perform a method according to an embodiment of the present disclosure.

The program (software module or software) may be stored in non-volatile memory, including random access memory and flash memory, Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), magnetic disk storage, compact disc ROM (CD-ROM), Digital Versatile Discs (DVD), or other types of optical storage or magnetic tape. Alternatively, any combination of some or all of these memories may form a memory storing a program. A plurality of such memories may be included in an electronic device.

Further, the program may be stored in an attachable storage device that can access the electronic device through a communication network such as the internet, an intranet, a Local Area Network (LAN), a wide area LAN (wlan), and a Storage Area Network (SAN), or a combination thereof. Such storage devices may access the electronic device via an external port. The portable electronic device is accessible to a separate storage device on the communication network.

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