阅读说明：本技术 无线通信系统中发送和接收探测参考信号的方法和设备 (Method and apparatus for transmitting and receiving sounding reference signal in wireless communication system ) 是由 高成源 朴钟贤 姜智源 于 2020-05-11 设计创作，主要内容包括：根据本说明书的一个实施例,一种用于在无线通信系统中通过终端发送探测参考信号(SRS)的方法包括：接收与SRS的发送有关的配置信息的步骤；以及发送SRS的步骤。该方法的特征在于,在包括除子帧的最后符号之外的至少一个符号的区域中配置SRS,该区域包括一定数量的保护符号,并且保护符号与SRS的跳频或天线切换中的至少一个相关。(According to one embodiment of the present specification, a method for transmitting a Sounding Reference Signal (SRS) by a terminal in a wireless communication system includes: a step of receiving configuration information relating to transmission of an SRS; and a step of transmitting the SRS. The method is characterized by configuring the SRS in a region including at least one symbol other than a last symbol of the subframe, the region including a number of guard symbols, and the guard symbols being associated with at least one of frequency hopping or antenna switching of the SRS.)

1. A method of transmitting a Sounding Reference Signal (SRS) by a User Equipment (UE) in a wireless communication system, the method comprising:

receiving configuration information related to transmission of a Sounding Reference Signal (SRS); and

the SRS is transmitted to the mobile station in the mobile communication system,

wherein the SRS is configured in a region consisting of at least one symbol except a last symbol of a subframe,

wherein the region includes a particular number of guard symbols, an

Wherein the guard symbols relate to at least one of frequency hopping or antenna switching of the SRS.

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

wherein the particular number is determined based on at least one of the frequency hopping or the antenna switching.

3. The method of claim 2, wherein the first and second light sources are selected from the group consisting of,

wherein the number of transmissions of the SRS is determined based on a factor related to repetition of the SRS and a specific symbol index.

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

wherein the specific symbol index is related to symbols other than the specific number of guard symbols among the symbols within the region.

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

wherein the frequency hopping or the antenna switching is performed based on the number of transmissions.

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

wherein the frequency hopping is performed earlier than the antenna switching.

7. The method of claim 6, wherein the first and second light sources are selected from the group consisting of,

wherein the antenna switching is performed based on at least one of: the number of times of the frequency hopping or the number of transmissions performed over a bandwidth in which transmission of the SRS is configured.

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

wherein the configuration information comprises information relating to the area, an

Wherein the information related to the region includes information on at least one of a number of symbols or a position of a symbol.

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

wherein the number of symbols or the position of the symbols relates to at least one of the symbols in which the SRS is transmitted or the guard symbols.

10. The method of claim 1, further comprising: transmitting UE capability information regarding whether to configure the guard symbol.

11. A User Equipment (UE) transmitting a Sounding Reference Signal (SRS) in a wireless communication system, the UE comprising:

one or more transceivers;

one or more processors that control the one or more transceivers; and

one or more memories operably connectable to the one or more processors and storing instructions that, when executed by the one or more processors, perform operations,

wherein the operations comprise:

receiving configuration information related to transmission of a Sounding Reference Signal (SRS); and

the SRS is transmitted to the mobile station in the mobile communication system,

wherein the SRS is configured in a region consisting of at least one symbol except a last symbol of a subframe,

wherein the region includes a particular number of guard symbols, an

Wherein the guard symbols relate to at least one of frequency hopping or antenna switching of the SRS.

12. An apparatus comprising one or more memories and one or more processors operatively coupled to the one or more memories,

wherein the one or more processors are configured to enable the apparatus to:

receiving configuration information related to transmission of a Sounding Reference Signal (SRS); and

the SRS is transmitted to the mobile station in the mobile communication system,

wherein the SRS is configured in a region consisting of at least one symbol except a last symbol of a subframe,

wherein the region includes a particular number of guard symbols, an

Wherein the guard symbols relate to at least one of frequency hopping or antenna switching of the SRS.

13. One or more non-transitory computer-readable media storing one or more instructions that,

wherein the one or more instructions executable by the one or more processors enable the user equipment to:

receiving configuration information related to transmission of a Sounding Reference Signal (SRS); and

the SRS is transmitted to the mobile station in the mobile communication system,

wherein the SRS is configured in a region consisting of at least one symbol except a last symbol of a subframe,

wherein the region includes a particular number of guard symbols, an

Wherein the guard symbols relate to at least one of frequency hopping or antenna switching of the SRS.

14. A method of receiving a Sounding Reference Signal (SRS) by a base station in a wireless communication system, the method comprising:

transmitting configuration information related to transmission of a Sounding Reference Signal (SRS); and

the SRS is received and the received data is transmitted,

wherein the SRS is configured in a region consisting of at least one symbol except a last symbol of a subframe,

wherein the region includes a particular number of guard symbols, an

Wherein the guard symbols relate to at least one of frequency hopping or antenna switching of the SRS.

15. A base station for receiving an uplink signal in a wireless communication system, comprising:

one or more transceivers;

one or more processors controlling the one or more transceivers; and

one or more memories operably connectable to the one or more processors and storing instructions that, when executed by the one or more processors, perform operations,

wherein the operations comprise:

transmitting configuration information related to transmission of a Sounding Reference Signal (SRS); and

the SRS is received and the received data is transmitted,

wherein the SRS is configured in a region consisting of at least one symbol except a last symbol of a subframe,

wherein the region includes a particular number of guard symbols, an

Wherein the guard symbols relate to at least one of frequency hopping or antenna switching of the SRS.

Technical Field

The present disclosure relates to a method and apparatus for transmitting and receiving a sounding reference signal in a wireless communication system.

Background

Mobile communication systems have been developed to provide voice services while ensuring user activities. However, the service coverage of the mobile communication system has been extended even to data services as well as voice services. Today, the explosive growth of services has resulted in resource shortages and user demands for high-speed services, requiring more advanced mobile communication systems.

The requirements of next generation mobile communication systems include to a large extent handling huge data traffic, very high data rates per user, handling a significant amount of connected devices, very low end-to-end delay and high energy efficiency. To this end, various technologies such as dual connectivity, massive Multiple Input Multiple Output (MIMO), in-band full duplex, non-orthogonal multiple access (NOMA), support for ultra-wideband, and device networking are being investigated.

Disclosure of Invention

Technical problem

The present disclosure presents a method of transmitting a Sounding Reference Signal (SRS). Specifically, if both the antenna switching operation and the frequency hopping operation are configured with respect to the transmission of the SRS, the SRS may not be transmitted with respect to the same hopping band and may be transmitted with respect to a different hopping band for each antenna port. Accordingly, the present disclosure proposes an SRS transmission method capable of solving the above-mentioned problems.

The technical objects of the present invention are not limited to the above technical objects, and other technical objects not mentioned above will be obviously recognized by those of ordinary skill in the art from the following description.

Technical scheme

According to an embodiment of the present disclosure, a method of transmitting a Sounding Reference Signal (SRS) by a UE in a wireless communication system includes receiving configuration information related to transmission of the SRS and transmitting the SRS.

Configuring the SRS in a region composed of at least one symbol other than a last symbol of a subframe, the region including a particular number of guard symbols, and the guard symbols relating to at least one of frequency hopping or antenna switching of the SRS.

The particular number may be determined based on at least one of the frequency hopping or the antenna switching.

The number of transmissions of the SRS can be determined based on a factor related to repetition of the SRS and a particular symbol index.

The specific symbol index may relate to symbols other than the specific number of guard symbols among the symbols within the region.

The frequency hopping or the antenna switching may be performed based on the number of transmissions.

The frequency hopping may be performed earlier than the antenna switching.

The antenna switching may be performed based on at least one of: the number of times of the frequency hopping or the number of transmissions performed over a bandwidth in which transmission of the SRS is configured.

The configuration information may include information related to the region, and the information related to the region may include information on at least one of the number of symbols or the position of the symbols.

The number of symbols or the positions of the symbols may be related to at least one of the symbols transmitting the SRS or the guard symbols.

The method may further include transmitting UE capability information regarding whether to configure the guard symbol.

A UE transmitting a Sounding Reference Signal (SRS) in a wireless communication system according to another embodiment of the present disclosure includes: one or more transceivers; one or more processors controlling the one or more transceivers; and one or more memories operably connectable to the one or more processors and storing instructions that, when executed by the one or more processors, perform operations.

The operations include receiving configuration information related to transmission of a Sounding Reference Signal (SRS); and transmitting the SRS.

Configuring the SRS in a region composed of at least one symbol other than a last symbol of a subframe, the region including a particular number of guard symbols, and the guard symbols relating to at least one of frequency hopping or antenna switching of the SRS.

An apparatus according to yet another embodiment of the present disclosure includes one or more memories and one or more processors operatively coupled to the one or more memories.

The one or more processors are configured to enable the apparatus to receive configuration information related to transmission of a Sounding Reference Signal (SRS) and transmit the SRS.

Configuring the SRS in a region composed of at least one symbol other than a last symbol of a subframe, the region including a particular number of guard symbols, and the guard symbols relating to at least one of frequency hopping or antenna switching of the SRS.

One or more non-transitory computer-readable media according to yet another embodiment of the disclosure store one or more instructions.

One or more instructions executable by one or more processors enable a user equipment to receive configuration information related to transmission of a Sounding Reference Signal (SRS) and to transmit the SRS.

Configuring the SRS in a region composed of at least one symbol other than a last symbol of a subframe, the region including a particular number of guard symbols, and the guard symbols relating to at least one of frequency hopping or antenna switching of the SRS.

A method of receiving a Sounding Reference Signal (SRS) by a base station in a wireless communication system according to yet another embodiment of the present disclosure includes transmitting configuration information related to transmission of a Sounding Reference Signal (SRS) and receiving the SRS.

Configuring the SRS in a region composed of at least one symbol other than a last symbol of a subframe, the region including a particular number of guard symbols, and the guard symbols relating to at least one of frequency hopping or antenna switching of the SRS.

A base station receiving an uplink signal in a wireless communication system according to still another embodiment of the present disclosure includes one or more transceivers; one or more processors controlling the one or more transceivers; and one or more memories operably connectable to the one or more processors and storing instructions that, when executed by the one or more processors, perform operations.

The operations include transmitting configuration information related to transmission of a Sounding Reference Signal (SRS) and receiving the SRS.

Configuring the SRS in a region composed of at least one symbol other than a last symbol of a subframe, the region including a particular number of guard symbols, and the guard symbols relating to at least one of frequency hopping or antenna switching of the SRS.

Advantageous effects

According to an embodiment of the present disclosure, a region where transmission of the SRS is configured includes a certain number of guard symbols. The guard symbols may relate to at least one of frequency hopping or antenna switching. If the frequency hopping and antenna switching operations are configured by the configuration of the guard symbols, ambiguity can be removed in the UE operation. Further, from the perspective of multi-UE, there is an effect that SRS capacity can be secured and SRS transmittable range between UEs is not violated.

According to an embodiment of the present disclosure, the number of transmissions of the SRS may be determined based on a factor related to repetition of the SRS and a specific symbol index. The specific symbol index may relate to symbols other than a specific number of guard symbols among the symbols within the region. Frequency hopping or antenna switching may be performed based on the number of transmissions. Frequency hopping can be performed earlier than antenna switching. The antenna switching may be performed based on at least one of a number of frequency hops or a number of transmissions performed over a bandwidth configuring transmission of the SRS.

Accordingly, frequency hopping or antenna switching can be performed based on the number of transmissions of the SRS. Furthermore, the accuracy of DL CSI acquisition can be improved because the antenna switching operation can be maintained at the same antenna port while frequency hopping is performed in association with the number of frequency hopping. Since the frequency hopping/repeating operation is completed before the antenna switching, the guard symbols attributable to the antenna switching can be minimized, and the waste of resources can be reduced.

According to an embodiment of the present disclosure, UE capability information related to configuration of guard symbols may be transmitted. Whether to configure the guard symbol may be determined based on the capability of the corresponding UE. Accordingly, since the guard symbol is not configured with respect to the UE having good capability, resources can be reduced, and since the guard symbol is configured with respect to the UE having no good capability, degradation of the SRS transmission symbol attributable to the power transition period can be prevented.

The advantages obtainable in the present invention are not limited to the above effects, and other advantages not mentioned will be clearly understood by those skilled in the art from the following description.

Drawings

Fig. 1 illustrates a structure of a radio frame in a wireless communication system to which the method proposed in the present disclosure can be applied.

Fig. 2 is a diagram illustrating a resource grid for one downlink slot in a wireless communication system to which the method proposed in the present disclosure can be applied.

Fig. 3 illustrates a structure of a downlink subframe in a wireless communication system to which the method proposed in the present disclosure can be applied.

Fig. 4 illustrates a structure of an uplink subframe in a wireless communication system to which the method proposed in the present disclosure can be applied.

Fig. 5 illustrates physical channels and general signal transmission used in the 3GPP system.

Fig. 6 illustrates an uplink subframe including an SRS in a wireless communication system to which the method proposed in the present disclosure may be applied.

Fig. 7 illustrates one example of component carriers and carrier aggregation in a wireless communication system to which the method proposed in the present disclosure may be applied.

Fig. 8 illustrates an example of differentiation of cells in a system supporting carrier aggregation to which the method proposed in the present disclosure may be applied.

Fig. 9 is a flowchart for describing an operation of a UE to which the method proposed in the present disclosure can be applied.

Fig. 10 is a flowchart illustrating a method for transmitting a sounding reference signal by a UE in a wireless communication system according to an embodiment of the present disclosure.

Fig. 11 is a flowchart illustrating a method for receiving a sounding reference signal by a base station in a wireless communication system according to another embodiment of the present disclosure.

Fig. 12 illustrates an example of the communication system 1 applied to the present disclosure.

Fig. 13 illustrates an example of a wireless device suitable for use with the present disclosure.

Fig. 14 illustrates an example of a signal processing circuit applied to the present disclosure.

Fig. 15 illustrates another example of a wireless device applied to the present disclosure.

Fig. 16 illustrates an example of a portable device applied to the present disclosure.

Detailed Description

Reference will now be made in detail to embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. In general, suffixes such as "module" and "unit" may be used to refer to an element or component. The use of such a suffix herein is merely intended to facilitate the description of the present disclosure, and the suffix itself is not intended to give any special meaning or function. It should be noted that if it is determined that a detailed description of a known technique may make embodiments of the present disclosure modular, the detailed description of the known technique will be omitted. The accompanying drawings are provided to facilitate an easy understanding of various technical features, and it should be understood that embodiments presented herein are not limited by the accompanying drawings. Accordingly, the disclosure should be construed to extend to any variations, equivalents, and alternatives beyond those specifically set forth in the drawings.

In this specification, a base station has the meaning of a terminal node of a network through which the base station communicates directly with a device. In this document, a specific operation described as being performed by the base station may be performed by an upper node of the base station according to the situation. That is, it is apparent that, in a network composed of a plurality of network nodes including a base station, various operations performed for communication with a device may be performed by the base station or other network nodes other than the base station. The Base Station (BS) may be replaced by other terminology such as a fixed station, a node B, eNB (evolved node B), a Base Transceiver System (BTS), or an Access Point (AP). In addition, devices may be fixed or may have mobility, and may be replaced with other terms such as User Equipment (UE), Mobile Station (MS), User Terminal (UT), mobile subscriber station (MSs), Subscriber Station (SS), Advanced Mobile Station (AMS), Wireless Terminal (WT), Machine Type Communication (MTC) device, machine to machine (M2M) device, or device to device (D2D) device.

Hereinafter, Downlink (DL) means communication from the eNB to the UE, and Uplink (UL) means communication from the UE to the eNB. In DL, the transmitter may be part of an eNB and the receiver may be part of a UE. In the UL, the transmitter may be part of a UE and the receiver may be part of an eNB.

Specific terms used in the following description have been provided to aid in understanding the present invention, and the use of such specific terms may be modified into various forms without departing from the technical spirit of the present invention.

The following techniques may be used in various wireless access systems such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and non-orthogonal multiple access (NOMA). CDMA may be implemented using radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA 2000. TDMA may be implemented using radio technologies such as global system for mobile communications (GSM)/General Packet Radio Service (GPRS)/enhanced data rates for GSM evolution (EDGE). OFDMA may be implemented using radio technologies such as the Electrical and electronics Engineers IEEE 802.11(Wi-Fi), IEEE 802.16(WiMAX), IEEE 802-20, or evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). Third generation partnership project (3GPP) Long Term Evolution (LTE) is part of evolved UMTS (E-UMTS) using evolved UMTS terrestrial radio access (E-UTRA) and employs OFDMA in the downlink and SC-FDMA in the uplink. LTE-advanced (LTE-A) is an evolution of 3GPP LTE.

Embodiments of the present specification may be supported by standard documents disclosed in at least one of IEEE 802, 3GPP, and 3GPP2, i.e., wireless access systems. That is, steps or portions which belong to embodiments of the present specification and are not described in order to clearly disclose the technical spirit of the present invention may be supported by these documents. In addition, all terms disclosed in this document may be described by a standard document.

For more clear description, the 3GPP LTE/LTE-a (new radio) is mainly described, but the technical features of the present invention are not limited thereto.

General system

Fig. 1 illustrates a structure of a radio frame in a wireless communication system to which an embodiment of the present invention can be applied.

The 3GPP LTE/LTE-a supports a radio frame structure type 1, which may be applied to Frequency Division Duplexing (FDD), and a radio frame structure type 2, which may be applied to Time Division Duplexing (TDD).

The size of a radio frame in the time domain is represented as a multiple of a time unit of T _ s ═ 1/(15000 × 2048). UL and DL transmissions comprise radio frames with a duration T _ f 307200T _ s10 ms.

Fig. 1 (a) illustrates a radio frame structure type 1. The type 1 radio frame may be applied to both full duplex FDD and half duplex FDD.

The radio frame includes 10 subframes. The radio frame consists of 20 slots of length 15360 × T _ s 0.5ms, and is given an index of 0 to 19 per slot. One subframe includes two consecutive slots in the time domain, and subframe i includes slot 2i and slot 2i + 1. The time required to transmit a subframe is referred to as a Transmission Time Interval (TTI). For example, the length of the subframe i may be 1ms, and the length of the slot may be 0.5 ms.

UL transmission and DL transmission of FDD are distinguished in the frequency domain. There is no restriction in full duplex FDD, and the UE may not transmit and receive simultaneously in half duplex FDD operation.

One slot includes a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a time domain and includes a plurality of Resource Blocks (RBs) in a frequency domain. In 3GPP LTE, since OFDMA is used in downlink, an OFDM symbol is used to represent one symbol period. The OFDM symbol may be referred to as one SC-FDMA symbol or symbol period. The RB is a resource allocation unit and includes a plurality of consecutive subcarriers in one slot.

Fig. 1(b) shows a frame structure type 2.

A type 2 radio frame includes two half-frames each 153600 × T _ s-5 ms long. Each field includes 30720 × T _ s5 subframes of length 1 ms.

In frame structure type 2 of the TDD system, an uplink-downlink configuration is a rule indicating whether to allocate (or reserve) uplink and downlink to all subframes.

Table 1 shows an uplink-downlink configuration.

[ Table 1]

Referring to table 1, in each subframe of a radio frame, "D" denotes a subframe for DL transmission, "U" denotes a subframe for UL transmission, and "S" denotes a special subframe including three types of fields of a downlink pilot time slot (DwPTS), a Guard Period (GP), and an uplink pilot time slot (UpPTS).

The DwPTS is used for initial cell search, synchronization, or channel estimation in the UE. UpPTS is used for channel estimation in eNB and for UL transmission synchronization of the synchronized UE. The GP is a duration for removing interference occurring in the UL due to a multipath delay of a DL signal between the UL and the DL.

Each subframe i includes slot 2i and slot 2i +1 of T _ slot 15360 × T _ s 0.5 ms.

The UL-DL configuration may be classified into 7 types, and the positions and/or the numbers of DL subframes, special subframes, and UL subframes are different for each configuration.

A point of time at which a change from downlink to uplink is performed or a point of time at which a change from uplink to downlink is performed is referred to as a switching point. The periodicity of the switching point means that a period in which the uplink subframe and the downlink subframe are changed is identically repeated. Both 5ms or 10ms are supported in the periodicity of the switching point. If the periodicity of the switching point has a downlink-uplink switching point period of 5ms, then a special subframe S exists in each half-frame. The special subframe S is only present in the first half frame if the periodicity of the switching point has a downlink-uplink switching point period of 5 ms.

In all configurations, 0 and 5 subframes and DwPTS are used for downlink transmission only. The UpPTS and the subframe subsequent to the subframe are always used for uplink transmission.

Such uplink-downlink configuration may be known to both the eNB and the UE as system information. Whenever the uplink-downlink configuration information is changed, the eNB may inform the UE of a change in the uplink-downlink allocation status of radio frames by transmitting only an index of the uplink-downlink configuration information to the UE. Also, the configuration information is a kind of downlink control information and may be transmitted through a Physical Downlink Control Channel (PDCCH) like other scheduling information. The configuration information may be transmitted as broadcast information to all UEs within the cell through a broadcast channel.

Table 2 shows the configuration of the special subframe (length of DwPTS/GP/UpPTS).

[ Table 2]

The structure of the radio frame according to the example of fig. 1 is only one example, and the number of subcarriers included in the radio frame, the number of slots included in the subframe, and the number of OFDM symbols included in the slots may be variously changed.

Fig. 2 is a diagram illustrating a resource grid of one downlink slot in a wireless communication system to which an embodiment of the present invention may be applied.

Referring to fig. 2, one downlink slot includes a plurality of OFDM symbols in the time domain. It is described herein that one downlink slot includes 7 OFDM symbols and one resource block includes 12 subcarriers in the frequency domain for exemplary purposes only, and the present invention is not limited thereto.

Each element on the resource grid is referred to as a resource element, and one resource block includes 12 × 7 resource elements. Number N of resource blocks included in a downlink slot^DLDepending on the downlink transmission bandwidth.

The structure of the uplink slot may be the same as that of the downlink slot.

Fig. 3 illustrates a structure of a downlink subframe in a wireless communication system to which the present invention can be applied.

Referring to fig. 3, a maximum of three OFDM symbols located in a front portion of a first slot of a subframe correspond to a control region in which a control channel is allocated, and the remaining OFDM symbols correspond to a data region in which a Physical Downlink Shared Channel (PDSCH) is allocated. Downlink control channels used in 3GPP LTE include: for example, a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), and a physical hybrid ARQ indicator channel (PHICH), etc.

The PCFICH is transmitted in the first OFDM symbol of the subframe and carries information on the number of OFDM symbols used to transmit the control channel in the subframe (i.e., the size of the control region). The PHICH is a response channel for uplink and carries an Acknowledgement (ACK)/negative-acknowledgement (NACK) signal for hybrid automatic repeat request (HARQ). Control information transmitted in the PDCCH is referred to as Downlink Control Information (DCI). The DCI includes uplink resource allocation information, downlink resource allocation information, or an uplink transmit (Tx) power control command for a specific UE group.

The PDCCH may carry information (also referred to as "downlink grant") on resource allocation and a transport format of a downlink shared channel (DL-SCH), resource allocation information (also referred to as "uplink grant") on an uplink shared channel (UL-SCH), paging information on a PCH, system information on the DL-SCH, resource allocation of an upper layer control message such as a random access response transmitted on the PDSCH, a set of transmission power control commands for individual UEs in a specific UE group, and activation of voice over internet protocol (VoIP), etc. Multiple PDCCHs may be transmitted within the control region, and the UE may monitor the multiple PDCCHs. The PDCCH is transmitted on a single Control Channel Element (CCE) or an aggregation of some consecutive CCEs. The CCE is a logical allocation unit used to provide a coding rate to the PDCCH according to a state of a radio channel. CCEs correspond to a plurality of resource element groups. The format of the PDCCH and the number of available bits of the PDCCH are determined by an association relationship between the number of CCEs and a coding rate provided by the CCEs.

The base station determines a format of the PDCCH based on the DCI to be transmitted to the UE, and attaches a Cyclic Redundancy Check (CRC) to the control information. A unique identifier (radio network temporary identifier (RNTI)) is masked to the CRC according to the owner or usage of the PDCCH. If the PDCCH is a PDCCH for a specific UE, an identifier unique to the UE, for example, cell-RNTI (C-RNTI) may be masked to the CRC. If the PDCCH is a PDCCH for a paging message, a paging indication identifier, for example, paging-RNTI (P-RNTI) may be masked to the CRC. If the PDCCH is a PDCCH for system information, more particularly, a System Information Block (SIB), a system information identifier, for example, a system information-RNTI (SI-RNTI) may be masked to the CRC. The random access-RNTI (RA-RNTI) may be masked to the CRC to facilitate indication of a random access response by the UE as a response to transmission of the random access preamble.

Fig. 4 illustrates a structure of an uplink subframe in a wireless communication system to which the present invention can be applied.

Referring to fig. 4, an uplink subframe may be divided into a control region and a data region in a frequency domain. A Physical Uplink Control Channel (PUCCH) carrying uplink control information is allocated to the control region. A Physical Uplink Shared Channel (PUSCH) carrying user data is allocated to the data region. In order to maintain the single carrier characteristic, one UE does not transmit PUCCH and PUSCH at the same time.

A pair of Resource Blocks (RBs) is allocated to a PUCCH for one UE within a subframe. RBs belonging to the RB pair occupy different subcarriers in each of the two slots. This is called that the RB pair allocated to the PUCCH hops at the slot boundary.

Physical channel and general signal transmission

Fig. 5 illustrates physical channels and general signal transmission used in the 3GPP system. In a wireless communication system, a UE receives information from an eNB through a Downlink (DL) and transmits information to the eNB through an Uplink (UL). Information transmitted and received by the eNB and the UE includes data and various control information, and there are various physical channels according to the type/use of the information transmitted and received by the eNB and the UE.

When the UE is powered on or newly enters a cell, the UE performs an initial cell search operation such as synchronization with the eNB (S501). To this end, the UE may receive a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) from the eNB and synchronize with the eNB and acquire information such as a cell ID. Thereafter, the UE may receive a Physical Broadcast Channel (PBCH) from the eNB and acquire intra-cell broadcast information. Meanwhile, the UE receives a downlink reference signal (DLRS) to check a downlink channel state in the initial cell search step.

The UE that completes the initial cell search receives a Physical Downlink Control Channel (PDCCH) and receives a Physical Downlink Shared Channel (PDSCH) according to information loaded on the PDCCH to acquire more specific system information (S502).

Meanwhile, when the eNB or radio resources for signal transmission are not accessed for the first time, the UE may perform a random access procedure (RACH) to the eNB (S503 to S506). For this, the UE may transmit a specific sequence with a preamble through a Physical Random Access Channel (PRACH) (S503 and S505) and receive a response message (random access response (RAR) message) to the preamble through a PDCCH and a corresponding PDSCH. In case of the contention-based RACH, a contention resolution procedure may be additionally performed (S506).

The UE performing the above-described procedure may then perform PDCCH/PDSCH reception (S507) and Physical Uplink Shared Channel (PUSCH)/Physical Uplink Control Channel (PUCCH) transmission (S508) as a general uplink/downlink signal transmission procedure. In particular, the UE may receive Downlink Control Information (DCI) through the PDCCH. Here, the DCI may include control information such as resource allocation information for the UE, and the format may be differently applied according to a use purpose.

Meanwhile, the control information transmitted by the UE to the eNB through the uplink or received by the UE from the eNB may include a downlink/uplink ACK/NACK signal, a Channel Quality Indicator (CQI), a Precoding Matrix Index (PMI), a Rank Indicator (RI), and the like. The UE may transmit control information such as CQI/PMI/RI through PUSCH and/or PUCCH.

Sounding Reference Signal (SRS)

The SRS is mainly used for channel quality measurement to perform uplink frequency selective scheduling and is not related to transmission of uplink data and/or control information. However, the present disclosure is not limited thereto, and the SRS may be used for various other purposes to enhance power control or to support various startup functions of a recently non-scheduled terminal. As examples of startup functions, an initial Modulation and Coding Scheme (MCS), initial power control for data transmission, timing advance, and frequency semi-selective scheduling may be included. In this case, the frequency semi-selective scheduling refers to scheduling in which frequency resources are selectively allocated to a first slot of a subframe and allocated by pseudo-randomly hopping to another frequency in a second slot.

Further, the SRS may be used to measure downlink channel quality under the assumption that the radio channel is reciprocal between uplink and downlink. This assumption is particularly valid in Time Division Duplex (TDD) systems where the uplink and downlink share the same spectrum and are separated in the time domain.

An SRS subframe transmitted by a certain UE in a cell may be represented by a cell-specific broadcast signal. The 4-bit cell-specific 'srssubsframeconfiguration' parameter represents an array of 15 available subframes over which SRS can be transmitted over each radio frame. The array provides flexibility for adjusting SRS overhead according to deployment scenarios.

The 16 th array turns off the switching of SRS in the cell completely and this is mainly suitable for the serving cell serving high speed terminals.

Fig. 6 illustrates an uplink subframe including an SRS in a wireless communication system to which the method proposed in the present disclosure may be applied.

Referring to fig. 6, the SRS is continuously transmitted on the last SC-FDMA symbol on the arranged subframe. Therefore, the SRS and the DMRS are located in different SC-FDMA symbols.

PUSCH data transmission is not allowed in a specific SC-FDMA symbol for SRS transmission, and as a result, when the sounding overhead is highest, that is, even if SRS symbols are included in all subframes, the sounding overhead does not exceed about 7%.

Each SRS symbol is generated by a base sequence (random sequence or sequence set based on Zadoff-ch (zc)) for a given time unit and frequency band, and all terminals in the same cell use the same base sequence. In this case, SRS transmissions from multiple UEs in the same cell in the same frequency band at the same time are orthogonal by different cyclic shifts of the base sequence and are distinguished from each other.

By assigning different base sequences to respective cells, SRS sequences from different cells can be distinguished, but orthogonality between different base sequences is not guaranteed.

SRS transmission in NR systems

In the NR system, an SRS sequence for an SRS resource may be generated by the following equation 1.

[ equation 1]

In the case of the equation 1, the,a sequence number (v) indicating the SRS and a sequence set by the sequence group (u), and a Transmission Comb (TC) number K _ TC (K) may be included in a higher layer parameter SRS-Transmission comb_TC)。

Furthermore, for the antenna port p_iThe cyclic Shift (SC) α can be given as in the following equation 2_i。

[ equation 2]

In the case of the equation 2, the,may be given by the higher layer parameter SRS-CyclicShiftConfig. Further, the maximum value of the cyclic shift may be 12 in the case where K _ TC is 4 (i.e.,) And may be 8 in the case where K _ TC is 2 (i.e.,)。

sequence set (A)u)And sequence number (u) may conform to a higher layer parameter SRS-groupsequencehopfacing. Further, SRS sequence identifiersMay be given by the higher layer parameter SRS-sequence id. l' (i.e.,) Indicating the OFDM symbol number in the SRS resource.

At this time, if SRS-groupsequence hopping is 0, group hopping and sequence hopping are not used, which may be expressed as in the following equation 3.

[ equation 3]

v＝0

In equation 3, f _ gh (x, y) denotes sequence group hopping, and v denotes sequence hopping.

Alternatively, if SRS-GroupSequenceHopping is 1, group hopping is used instead of sequence hopping, and this may be expressed as in equation 4.

[ equation 4]

v＝0

In equation 4, f _ gh (x, y) denotes sequence group hopping, and v denotes sequence hopping. c (i) represents a pseudo-random sequence and can be initialized at the beginning of each radio frame

Alternatively, if SRS-GroupSequenceHopping is 2, sequence hopping is used instead of group hopping, and this may be expressed as in equation 5.

[ equation 5]

f_gh(n_s，f，l′)＝0

In equation 5, f _ gh (x, y) denotes sequence group hopping, and v denotes sequence hopping. c (i) represents a pseudo-random sequence and can be initialized at the beginning of each radio frame(wherein,. DELTA._ss∈{0,1,...,29})。

Sounding Reference Signal (SRS) hopping

SRS hopping may be performed only upon a periodic SRS trigger (e.g., trigger type 0). Further, allocation of SRS resources may be provided according to a predefined hopping pattern. In this case, the hopping pattern can be UE-specifically specified via higher layer signaling (e.g., RRC signaling) and overlap is not allowed.

Further, the SRS is hopped using a hopping pattern in each subframe in which the cell-specific and/or UE-specific SRS is transmitted, and a start position and a hopping equation in a frequency domain in which the SRS is hopped may be explained via the following equation 6.

[ equation 6]

In equation 6, nSRS means a hopping interval in the time domain, and Nb denotes the number of branches allocated to a tree level b, where b may be determined by BSRS configuration in dedicated RRC.

Fig. 7 illustrates one example of component carriers and carrier aggregation in a wireless communication system to which the method proposed in the present disclosure may be applied.

Fig. 7 (a) shows a single carrier structure defined in the LTE system. Two types of component carriers are used: DL CC and UL CC. The component carrier may have a frequency bandwidth of 20 MHz.

Fig. 7 (b) shows a carrier aggregation structure used in the LTE a system. Fig. 7 (b) shows a case where three component carriers having a frequency bandwidth of 20MHz are aggregated. In this example, 3 DL CCs and 3 UL CCs are employed, but the number of DL CCs and UL CCs is not limited to this example. In case of carrier aggregation, the UE can simultaneously monitor 3 CCs, can receive downlink signals/data, and can transmit uplink signals/data.

If a particular cell manages N DL CCs, the network may allocate M (M ≦ N) DL CCs to the UE. At this time, the UE may monitor only M DL CCs and receive DL signals from the M DL CCs. In addition, the network may assign priorities to the L (L ≦ M ≦ N) DL CCs so that the UE may be allocated a primary DL CC; in this case, the UE has to monitor L DL CCs. This scheme can be applied to uplink transmission in the same manner.

The link between the carrier frequency of the downlink resource (or DL CC) and the carrier frequency of the uplink resource (or UL CC) may be specified by a higher layer message such as an RRC message or system information. For example, the combination of DL resources and UL resources may be determined according to linkage defined by system information block type 2(SIB 2). More specifically, linking may refer to a mapping relationship between DL CCs through which PDCCHs carrying UL grants are transmitted and UL CCs using the UL grants; or a mapping relationship between a DL CC (or UL CC) through which data for a HARQ signal is transmitted and a UL CC (or DL CC) through which a HARQ ACK/NACK signal is transmitted.

Fig. 8 illustrates an example of differentiation of cells in a system supporting carrier aggregation to which the method proposed in the present disclosure may be applied.

Referring to fig. 8, the configured cell is a cell configured for carrier aggregation based on a measurement report and configured for each UE among cells of an eNB as shown in fig. 5. The configured cell may reserve resources for ack/nack transmissions ahead of time for PDSCH transmissions. The activated cells are cells configured to actually transmit PDSCH/PUSCH among the configured cells, which perform Channel State Information (CSI) reporting for PDSCH/PUSCH transmission and Sounding Reference Signal (SRS) transmission. A deactivated cell is a cell configured not to perform PDSCH/PUSCH transmission by a command or timer operation from the eNB, which may stop CSI reporting and SRS transmission.

Hereinafter, the SRS for antenna switching will be described in detail.

SRS for "antenna switching

SRS may be used to acquire DL Channel State Information (CSI) (i.e., DL CSI acquisition). As a specific example, in a TDD-based single or multi-cell (e.g., CA) scenario, a Base Station (BS) may schedule transmission of SRS to User Equipments (UEs) and then measure the SRS from the UEs. In this case, the BS can perform scheduling of DL signals/channels to the UE based on the measurement of SRS by assuming DL/UL reciprocity. In this case, with regard to SRS-based DL CSI acquisition, the SRS may be configured for antenna switching purposes.

As an example, the usage of SRS may be configured to the BS and/or UE by using higher layer parameters (e.g., the use of the RRC parameter SRS-ResourceSet) according to specifications (e.g., 3gpp TS 38.214). In this case, the usage of the SRS may be configured to be beam management usage, codebook transmission usage, non-codebook transmission usage, antenna switching usage, and the like.

Hereinafter, a case where SRS transmission (i.e., transmission of SRS resources or SRS resource sets) is configured for an antenna switching purpose among the purposes will be described in detail.

As an example, in case of a terminal having partial reciprocity, SRS transmission based on antenna switching (i.e., transmission antenna switching) may be supported for Downlink (DL) Channel State Information (CSI) acquisition through SRS transmission in case of such as Time Division Duplex (TDD). When antenna switching is applied, in the general case of antenna switching of a UE, approximately 15 μ s may be required between SRS resources (and/or between SRS resources and PUSCH/PUCCH). By taking this into account, the (minimum) guard period shown in table 10 below can be defined.

[ Table 3]

μ	Δf＝2μ·15[kHz]	Y [ symbol]
			0	15	1
1	30	1
			2	60	1
3	120	2

In table 3, μ denotes a parameter set, Δ f denotes a subcarrier interval, and Y denotes the number of symbols of the guard period, i.e., the length of the guard period. Referring to table 3, the guard period may be configured based on the parameter μ for determining the parameter set. In the guard period, the UE may be configured not to transmit any other signal, and the guard period may be configured to be entirely used for antenna switching. As an example, the guard period may be configured by considering SRS resources transmitted in the same slot. In particular, when a UE is configured and/or instructed to transmit an aperiodic SRS configured as antenna switching within a slot, the respective UE may transmit the SRS by using a different transmission antenna for each designated SRS resource, and a guard period may be configured between the respective resources.

Further, when a UE is configured with SRS resources and/or sets of SRS resources configured for antenna switching purposes by higher layer signaling, the respective UE may be configured to perform SRS transmission based on UE capabilities related to antenna switching. Here, the capability of the UE related to antenna switching may be "1T 2R", "2T 4R", "1T 4R", "1T 4R/2T 4R", "1T 1R", "2T 2R", "4T 4R", or the like. Here, "mTnR" may refer to a UE capability to support m transmissions and n receptions.

(sample S1) for example, in case of a UE supporting 1T2R, up to two sets of SRS resources may be configured as different values of resource type for the higher layer parameter SRS-resources set. Here, each set of SRS resources may have two SRS resources transmitted in different symbols, and each SRS resource may constitute a single SRS port in a given set of SRS resources. Further, an SRS port for a second SRS resource in a set of SRS resources may be configured to be associated with a different UE antenna port than an SRS port for a first SRS resource in the same set of SRS resources.

(sample S2) as another example, in case of a UE supporting 2T4R, up to two sets of SRS resources may be configured as different values of resource type for the higher layer parameter SRS-resources set. Here, each set of SRS resources may have two SRS resources transmitted in different symbols, and each SRS resource may constitute a single SRS port in a given set of SRS resources. Further, a pair of SRS ports for a second SRS resource in a set of SRS resources may be configured to be associated with a different pair of UE antenna ports than a pair of SRS ports for a first SRS resource in the same set of SRS resources.

(sample S3) as yet another example, in case of a UE supporting 1T4R, the SRS resource set may be configured in different schemes depending on whether SRS transmission is configured to be periodic, semi-persistent, and/or aperiodic. First, when SRS transmission is configured to be periodic or semi-persistent, a set of 0 SRS resources configured based on a resource type of a higher layer parameter SRS-resource set or one set of four SRS resources may be configured to be transmitted in different symbols. In this case, each SRS resource may constitute a single SRS port in a given set of SRS resources, and the SRS ports for each SRS resource may be configured to be associated with different UE antenna ports. In contrast, when SRS transmission is configured to be aperiodic, a set of 0 SRS resources configured based on a resourceType of a higher layer parameter SRS-ResourceSet or two sets of four SRS resources in total may be configured to be transmitted in different symbols of two different slots. In this case, SRS ports for respective SRS resources in two given sets of SRS resources may be configured to be associated with different UE antenna ports.

(sample S4) as yet another example, in case of a UE supporting 1T1R, 2T2R, or 4T4R, up to two SRS resource sets (each SRS resource set consisting of one SRS resource) may be configured for SRS transmission, and the number of SRS ports per SRS resource may be configured as 1,2, or 4.

When the indicated UE capability is 1T4R/2T4R, the respective UE may expect that the same number of SRS ports (e.g., 1 or 2) will be configured for all SRS resources in the SRS resource set. Further, when the indicated UE capability is 1T2R, 2T4R, 1T4R, or 1T4R/2T4R, the respective UE may not expect to configure or trigger one or more sets of SRS resources configured for antenna switching use in the same slot. Furthermore, even when the indicated UE capability is 1T1R, 2T2R, or 4T4R, the respective UE may not expect one or more sets of SRS resources configured or triggered for antenna switching purposes in the same slot.

The foregoing description may be combined with the methods described below in accordance with the present disclosure or may be provided to specify or clarify technical features of the methods presented herein. Furthermore, the embodiments and/or methods described in this disclosure are distinguished only for convenience of description, and some components of any one method may be replaced, or combined with components of another method.

Hereinafter, contents related to the trigger type of SRS, SRS transmission, and transmission of pusch (pucch) are specifically described.

In a Frequency Division Duplex (FDD) system, a Sounding Reference Signal (SRS) may be transmitted in the last symbol of each subframe.

In a Time Division Duplex (TDD) system, in addition to SRS transmission in an uplink subframe, an SRS having one or two symbols may be additionally transmitted based on a special subframe configuration by using an uplink pilot time slot (UpPTS) in a special subframe.

In addition to the existing UpPTS in the special subframe, the SRS having two or four symbols may be transmitted depending on the configuration of SC-FDMA symbols for additional uplink use.

The trigger types of the SRS are divided into type 0 and type 1 depending on the time domain characteristics. In case of type 0, the SRS is a periodic SRS based on a higher layer configuration. In case of type 1, SRS is aperiodic SRS triggered by DCI.

In the LTE standard, a transmission method of the UE for the configured SRS may be different according to higher layer parameters such as SRS-Bandwidth or SRS-HoppingBandwidth accompanying in the SRS configuration between the base station and the UE. For example, when the value of SRS-HoppingBandwidth is greater than the value of SRS-Bandwidth, no frequency hopping is configured, repetition is configured, and the UE needs to perform a corresponding operation (repetition) at the time of SRS transmission. In contrast, when the value of SRS-HoppingBandwidth is less than the value of SRS-Bandwidth, frequency hopping is configured according to the already defined frequency hopping pattern, and the UE needs to perform a corresponding operation (frequency hopping) at the time of SRS transmission.

In the NR Rel-15 standard, a repetition factor R is added. The repetition factor R is a parameter related to repetition and frequency hopping of the SRS. Repetition and hopping are configured simultaneously within a subframe by a repetition factor R, and the UE can perform corresponding operations (repetition and hopping).

Hereinafter, contents related to antenna switching of the SRS are described.

In the LTE standard, the 1T4R antenna switching operation can be defined as follows.

If UE-TxAntennaSelection-SRS-1T4R-Config and UE-transmittenceselection are configured simultaneously with respect to a given serving cell, the UE selects one of the first two antennas for PUSCH transmission and one of the four antennas for SRS transmission in each SRS instance.

The 1T2R antenna switching operation may be defined as follows. The presence of a field (UE-txontanneelection-SRS-2T 4R-NrOfPairs) as described in TS 36.213 illustrates a configuration for uplink closed loop transmit antenna selection where the UE selects two of the four antennas for simultaneous transmission of SRS with respect to the corresponding serving cell. Further, as described in TS 36.213, this field illustrates the number of antenna pairs to be selected for SRS transmission for a given serving cell. 2 (value 2) indicates that the UE needs to select one of the two antenna pairs in order to simultaneously transmit SRS in the respective SRS instances for the respective serving cells. 3 (value 3) indicates that the UE selects one of the three antenna pairs for simultaneous transmission of SRS in the respective SRS instances for the respective serving cells. EUTRAN does not configure ue-transmitten selection and ue-txontunnaneelection-SRS-2T 4R-nrofpapers for a given serving cell simultaneously.

In Rel-15 NR MIMO, SRS transmission for antenna switching is supported in order to effectively acquire DL CSI with respect to a UE having a number of transmission (Tx) chains smaller than the number of reception (Rx) chains.

A UE supporting antenna switching reports one of { "1T 2R", "1T 4R", "2T 4R", "1T 4R/2T 4R", "T ═ R" } as its capability to a base station. The base station may configure SRS resource sets and resources for antenna switching corresponding to the respective capabilities, and may indicate the transmission. Further, when configuring the time domain position of resources within the SRS resource set for antenna switching use by considering the antenna switching time of the UE, the base station may place and configure a symbol gap as a guard period between resources according to the parameter set (description related to table 3).

In the following, an agreement on LTE MIMO enhancements (additional SRS) that can be applied to the methods proposed in the present disclosure is described.

1. Agreement (for additional SRS considered scenario)

Working with additional SRS symbols in this WI should consider the following scenarios

TDD for non-CA

TDD CA Only

-FDD-TDD CA

2. Convention (location of additional SRS symbol in time domain)

The location in the time domain of possible additional SRS symbols in one general UL subframe for a cell includes:

option 1: using all symbols in one slot for SRS from a cell perspective

For example, another slot of the subframe may be used for PUSCH transmission for sTTI-capable UEs.

Option 2: using all symbols in one subframe for SRS from a cell perspective

Option 3: a subset of symbols in one slot may be used for SRS from a cell perspective

However, the location of the additional SRS is not limited to the above options.

For regions with low downlink SINR, supporting additional SRS symbols per UE in normal subframes may result in gains in downlink performance.

3. Protocol (aperiodic SRS support)

Aperiodic SRS transmission may be supported for the additional SRS symbols.

4. Protocol (Transmission of additional SRS)

A UE configured with an additional SRS in one UL subframe may transmit the SRS based on any one of the following options.

-option 1: frequency hopping is supported within one UL subframe.

-option 2: repetition is supported within one UL subframe.

-option 3: both frequency hopping and repetition are supported within one UL subframe.

5. Protocol

Both intra-subframe frequency hopping and repetition are supported for aperiodic SRS in the additional symbols.

6. Protocol (additional SRS and antenna switching)

Antenna switching within subframes is supported for aperiodic SRS in additional SRS symbols.

The term additional SRS symbol is additionally introduced in release 16 and the last symbol is not part of the additional SRS symbol.

7. Protocol (transfer of conventional SRS and additional SRS)

Both legacy SRS and additional SRS symbols may be configured for the same UE.

If the legacy SRS is aperiodic, the UE can transmit the legacy SRS or the additional SRS symbol in the same subframe.

If the legacy SRS is periodic, the UE may transmit the legacy SRS and the additional SRS symbols in the same or different subframes.

8. Convention (number of symbols in additional SRS)

The number of symbols that can be configured as additional SRS in the UE is 1-13.

In determining the future agreement, the following may be considered.

Intra-subframe hopping and repetition for additional SRS symbols

To support repetition and frequency hopping, the following may be discussed.

The value is obtained. Here, the first and second liquid crystal display panels are,is the number of OFDM symbols.

The value of R.Is the number of configured SRS symbols, and R is a repetition factor for the configured UE

Application to aperiodic SRS

Whether the legacy SRS and the additional SRS symbol have the same hopping pattern

Whether flexible configuration (e.g., comb/comb offset configuration) is supported for repetition of additional SRS symbols

9. Protocol

For the temporal position of possible additional srs (srs) symbols in one general UL subframe for a cell:

using 1 to 13 symbols in one subframe for SRS from a cell perspective

10. Protocol (Power control)

The same power control configuration applies to all additional SRS symbols configured to a single UE.

11. Protocol

Supporting transmission of aperiodic legacy SRS and aperiodic additional SRS symbols in the same subframe for a UE.

12. Protocol

In case of aperiodic SRS transmission, the following combination of features can be configured simultaneously.

Intra-subframe antenna switching

Antenna switching is supported over at least all antenna ports.

Whether the following is supported or not may be additionally considered.

Antenna switching across a subset of antenna ports

Frequency hopping in sub-frame (antenna switching across a subset of antenna ports)

Intra-subframe repetition

It may be considered whether the above features are applied to the additional SRS symbols only or to the conventional SRS symbols.

13. Protocol

To support SRS repetitionThe following parameters may be defined. Here, the first and second liquid crystal display panels are,is an OFDM symbolThe number is numbered,is the number of configured SRS symbols, and R is the repetition factor for the configured UE.

14. Protocol

The configurable number of additional SRS repetitions may be {1,2,3,4,6,7,8,9,12,13 }. This configuration may be applied per antenna port and per subband.

15. Protocol (code point triggered SRS Transmission via DCI)

Code points of the same DCI trigger SRS transmission for one of:

-aperiodic legacy SRS symbols only

-only aperiodic additional SRS symbols

-both aperiodic legacy SRS symbols and aperiodic additional SRS symbols within the same subframe

The association of a code point with one of the above may be configured through RRC signaling. In the absence of SRS triggering, separate code points may be supported.

16. Protocol

The size of the SRS request field for triggering release 16SRS may be the same as the size of the regular (release 15DCI format).

17. Protocol

A release 15DCI format that only supports SRS triggering may be used to trigger release 16SRS transmission.

18. Protocol

With additional SRS symbols, per symbol group hopping and sequence hopping can be supported.

The UE can use only one of per symbol group hopping or sequence hopping at a given time.

19. Protocol

To account for the minimum power variation due to frequency hopping or antenna switching of additional SRS symbols, one of the following options may be considered.

Option 1: a one symbol guard period may be introduced in the RAN1 specification.

Option 2: a guard period may not be introduced in the RAN1 specification.

In the UL normal subframe of the LTE TDD system up to release 15, the cell-specific SRS for a specific cell and the UE-specific SRS for a specific UE may be configured in only one symbol (last symbol) in one subframe.

As described above, in release 16LTE MIMO enhancements, only aperiodic SRS in additional SRS of UL normal subframes is preferentially supported.

The additional SRS (additional SRS) is different from the conventional SRS for its purpose.

Conventional SRS is used for several purposes. Specifically, the purposes of the conventional SRS include:

-obtaining UL CSI for UL scheduling or obtaining UL link adaptation or DL CSI for DL scheduling with DL/UL reciprocity

On the other hand, unlike the conventional SRS, the additional SRS may be considered as an SRS mainly targeting DL information of each cell using DL/UL reciprocity in a single serving cell or a multi-cell (CA environment).

Unlike the conventional SRS, which is transmitted only in the last symbol of the normal UL normal subframe, the additional SRS may be transmitted through a plurality of symbols in symbol positions other than the last symbol.

Currently, in one UL subframe, a multi-symbol SRS may be configured from 1 symbol to 13 symbols, except for the legacy SRS (except for the last symbol), from a cell perspective or from a UE perspective.

As described above, in flexibly configurable multi-symbol SRS, in order to enhance capacity and coverage, repetition and frequency hopping are required to accompany.

Furthermore, in UE implementations where the number of Tx chains is smaller than the number of Rx chains, SRS antenna switching operations for DL CSI acquisition based on DL/UL reciprocity also serve an important function in multi-symbol SRS.

Regarding SRS transmission by the UE, two or more operations (frequency hopping/repetition/antenna switching) may be simultaneously supported in one subframe. However, if frequency hopping/repetition and antenna switching are simultaneously configured by the base station in multi-symbol SRS, ambiguity may occur in UE operation if there is no base station configuration of the number of symbols of SRS that can complete the configured frequency hopping/repetition and antenna switching operations within a subframe and a guard period (e.g., gap symbols in NR Rel-15) that can be defined between SRS symbols. For example, it is necessary to specifically determine how to configure the slot symbols and the UE operation when antenna switching and frequency hopping/repetition are configured at the same time.

In existing LTE, a parameter to count the number of SRS transmissions, n, is added across subframes based on the periodicity of the UE-specific SRS_SRS. When supporting the repetition factor R supported in NR, even when such as(wherein,) In the subframe (2), n may be set by the number of SRS symbols and the R value_SRSAnd (4) increasing.

Hereinafter, operations related to antenna switching are described more specifically.

If closed-loop or open-loop UE Tx Antenna selection has been activated with respect to a given serving cell with respect to a UE supporting Tx Antenna selection or a UE that may be configured with SRS-Antenna-Switching-1T4R or SRS-Antenna-Switching-2T4R,

if the higher layer parameter "SRS-Antenna-Switching-1T 4R" is set to "on" with respect to a given serving cell, then the value at n is given as follows_SRSIndex a (n) of UE antenna transmitting SRS_SRS)。

a(n_SRS)＝n_SRS mod 4

In the above equation, a (n)_SRS) Is part and the entire sounding bandwidth and is based on the case where frequency hopping has been disabled (i.e., b)_hop≥B_SRS)。

In the above equation, when K mod Λ²When 0, β is 1, and if not 0, and is based on the case where frequency hopping has been activated (i.e., b is_hop<B_SRS)。

With respect to a UE consisting of a Λ UE Antenna pair, if the higher layer parameter "SRS-Antenna-Switching-2T 4R" is set to "on" with respect to a given serving cell, then Λ {2 or 3} is provided by the higher layer parameter "SRS-Antenna-Switching-2T 4R-nrofpapers" in this case.

With respect to UE antenna pairs, such as when Λ 2 (n)_SRS),2a(n_SRS) +1} and {0, a (n) when Λ ═ 3_SRS) +1}, the number n is given below_SRSIndex a (n) of the transmitted SRS_SRS)。

a(n_SRS)＝n_SRS modΛ

In the above equation, a (n)_SRS) Is for part and the entire sounding bandwidth and is based on the case where frequency hopping has been disabled (i.e., b)_hop≥B_SRS)。

In the above equation, when K mod Λ²When 0, β is 1, if not 0, and is based on the case where frequency hopping has been activated (i.e., b)_hop<B_SRS)。

If not, given in the number n as follows_SRSIndex a (n) of UE antenna transmitting SRS_SRS)。

a(n_SRS)＝n_SRS mod 2

In the above equation, a (n)_SRS) Is for part and the entire sounding bandwidth and is based on the case where frequency hopping has been disabled (i.e., b)_hop≥B_SRS)。

In the above equation, when K mod 4 is 0, β is 1, and if not 0, β is 0, and is based on the case where frequency hopping has been activated (i.e., b_hop<B_SRS). BSRS, bhop, Nb, and nSRS may be provided by tables 4 to 7 below.In this case, no matter N_bHow the value of (c) is,the case where a single SRS transmission is configured in the UE is excluded. One or more serving cells are configured in the UE. The UE does not expect to transmit SRS simultaneously on different antenna ports with respect to the cell group belonging to the frequency band signaled to switch together in txantennaswitch ul. One or more serving cells are configured in the UE. The UE does not expect to transmit SRS and PUSCH simultaneously through different antenna ports with respect to a cell group belonging to a frequency band signaled to switch together in txantennaswitch ul.

If the higher layer parameter "SRS-Antenna-Switching-1T 4R" is set to "on" or "SRS-Antenna-Switching-2T 4R" is set to "on" with respect to the serving cell, the UE does not expect to configure an Antenna port greater than two Antenna ports for a given uplink physical channel or signal of the corresponding serving cell.

Tables 4 to 7 illustrate that, with respect to the uplink bandwidth, when b is 0,1,2,3, m is_SRS,bAnd N_bThe value of (c).

In the case of Table 4, the uplink bandwidth isIn the case of Table 5 areIn the case of Table 6 areAnd in the case of Table 7 is

[ Table 4]

[ Table 5]

[ Table 6]

[ Table 7]

According to the antenna switching operation, when n_SRSWhen added, the antenna ports are also switched. In this case, if the UE operates based on the repetition factor correlation protocol, antenna port switching also occurs when frequency hopping is performed after repetition during R symbols, and the UE cannot transmit the SRS with respect to the same hopping band but with respect to different hopping bands for each antenna port.

By considering such a problem, the present disclosure proposes a symbol number configuration/indication method and antenna switching within a subframe for a multi-symbol SRS between a base station and a UE, and a configuration and indication method considering frequency hopping/repetition (within/between subframes), and describes a UE operation based on the corresponding configuration.

For convenience, a UE to which at least one of the proposals in the present disclosure is applied is referred to as an "enhanced UE". For example, including the case of configuring/applying/transmitting multi-symbol SRS or additional (or multiple SRS transmissions within a single subframe), such as Rel-16 UEs.

In the present disclosure, the additional SRS in the LTE system is basically described for convenience, but this may be applied to all systems that transmit the SRS in multiple symbols, such as 3GPP NR (new RAT, new radio access technology). Further, if the present disclosure is applied in NR, a subframe and slot structure/unit in an LTE system may be modified and applied as in the following table 8 in the NR system.

[ Table 8]

[ method 1]

Hereinafter, UE/base station operations related to antenna switching and frequency hopping/repetition of SRS are described.

In particular, a symbol number configuration/indication method (within a subframe) for multi-symbol SRS (or additional SRS) between a base station and a UE, a configuration and indication method considering antenna switching and frequency hopping/repetition (within a subframe/between subframes), and a subsequent UE operation are described.

In an additional SRS configuration, the base station/UE may operate based on at least one of the following proposals. The following methods are divided for convenience of description only, and some elements of any one method may be replaced with some elements of another method or may be combined with and applied to each other.

[ proposal 1]

The UE may report to the base station whether gap symbols are necessary in frequency hopping and/or antenna switching operations. In the present disclosure, the gap symbol refers to a symbol in which the SRS is not transmitted, and may also be represented as a guard period or a guard symbol.

Alternatively, when it is necessary for the UE to report gap symbols to the base station using the UE capability, the UE may determine whether the base station configures a guard period. In particular, the base station may determine whether a guard period (e.g., a gap symbol) will be configured between SRS symbols on which frequency hopping and/or antenna switching is performed when additional SRS configuration is to be performed by considering the capability of the UE.

For example, if frequency hopping is performed, in the case of a better-capable UE or a UE equipped with a good-capable RF, the power transition period is short, or degradation of transmission symbols attributable to the existing power transition period may be small. Therefore, no gap symbols may be required between the SRS symbols over which frequency hopping is performed.

Furthermore, even in the case of antenna switching, gap symbols may not be required between SRS symbols at the time of antenna switching (at the time of switching antenna ports) for the same reason. In this case, the UE may report to the base station that slot symbols are not necessary in frequency hopping and/or antenna switching operations. The corresponding base station may configure SRS symbols (within a subframe) without gap symbols. This may reduce the waste of resources attributable to the indiscriminate configuration of n-slot symbols.

Conversely, if the UE reports that a gap symbol is necessary in the frequency hopping and/or antenna switching operation, the base station may configure SRS symbols (within a subframe) by placing a gap symbol between SRS symbols performing the frequency hopping and/or antenna switching operation. As described above, the capability degradation of the SRS symbol attributable to the power transition period can be prevented by the gap symbol configuration.

With respect to the frequency hopping operation and the antenna switching operation, the UE capability report may be reported for each operation, or may be integrated into one operation and reported.

[ proposal 2]

The base station may configure (by higher layers) symbols in which an additional SRS including a gap symbol in one subframe may be configured in the UE. In this case, the symbol may be a candidate set of positions for the gap (gap symbol) and the additional SRS.

For example, the base station may configure a starting symbol index and the number of symbols from the starting symbol index (i.e., the number of symbols spanned) in the UE by considering symbol indexes (index 13, i.e., except for the last symbol) in a range of 0 to 12 symbols in which the additional SRS may be configured in one subframe. The UE transmits the SRS within the corresponding range and does not expect additional SRS configuration outside the corresponding range. Alternatively, the UE may ignore and discard additional SRS configurations and SRS symbols outside the corresponding range.

The following effects exist: the SRS capacity can be guaranteed from the perspective of multi-UEs, and by the corresponding operation, the SRS transmittable range is not violated between UEs. In addition, symbol indexes of additional SRS and gap symbols within a symbol range configured in the UE may be re-indexed.

[ proposal 3]

The base station may configure the position of the gap symbols within the subframe at the symbol level in the UE through higher layer signaling as part of the additional SRS configuration (when the UE needs gap symbols at frequency hopping and/or antenna switching). The configuration method may be based on at least one of the following options.

Option 1)

The base station may configure the slot symbol positions in the UE in a bitmap form. For example, the position of the gap symbol may be represented as 13 bits by considering symbol indexes (index 13, i.e., except for the last symbol) in the range of 0 to 12 where the additional SRS may be configured in one subframe. For example, if the bitmap is 0010010010000, gap symbols are configured among the third, sixth, and ninth symbols (symbol indexes 2, 5, and 8).

Option 2)

The base station may configure the gap symbol positions in the UE in equation form.

Example 1) if the UE needs a gap symbol between SRS symbols on which frequency hopping is performed and only frequency hopping/repetition is configured in the UE, the gap symbol may be configured as follows.

If n +1 (e.g., n is 0 to 12) among symbol indexes n in which guard symbols may be located may be divisible by a value obtained by adding 1 to a repetition factor R (e.g., (n +1) mod (R +1) ═ 0), the base station may configure the corresponding symbol n in the UE as a guard symbol.

Example 2) if only antenna switching is configured in the UE and the UE needs gap symbols between SRS symbols in which antenna ports are switched, the gap symbols may be configured as follows. If n +1 can be divided by 2 (e.g., (n +1) mod 2 ═ 0), the base station can configure the corresponding symbol n in the UE as a guard symbol.

Example 3) if frequency hopping/repetition and antenna switching are simultaneously configured in the UE and the UE needs a gap symbol for both operations, the gap symbol may be configured as follows. As in the above example, if n +1 can be evenly divided by a value obtained by adding 1 to the repetition factor R (e.g., (n +1) mod (R +1) ═ 0), the base station can configure the corresponding symbol n as a guard symbol.

Further, if frequency hopping/repetition and antenna switching are simultaneously configured in the UE, but a gap symbol is only necessary for the antenna switching operation, the gap symbol may be configured as follows. If n +1 can be divided exactly by a value obtained by multiplying the repetition factor R by a value obtained by the number of times the frequency hopping is performed on the configured SRS bandwidth at the time of SRS frequency hopping transmission plus 1, the base station can configure the corresponding symbol n as a guard symbol. In this case, the conditions related to the present embodiment can be expressed as the following equations.

In this case, N_bMay be based on the values of tables 4 to 7. Equation ofIs to fully cover the frequency hopping bandwidth (e.g., b) by changing the frequency band when frequency hopping is configured_hop<B_SRS) And the hop number adopted by the configured SRS bandwidth. The corresponding number of transitions may depend on the value b_hopBut is different.

By correlating the respective operations of the Nb parameters, gap symbols attributable to antenna switching can be minimized and waste of resources can be reduced because the frequency hopping/repeating operation is completed before antenna switching.

The proposed operation is not limited to only the operation based on the above equation, and may also include a case where the above equation is extended.

Hereinafter, contents related to the frequency hopping of the SRS are specifically described.

Frequency hopping of SRS parameter b provided by higher layer parameter SRS-HoppingBandwidth_hopE {0,1,2,3} configuration. For aperiodic transmissions, frequency hopping may not be supported.

If frequency hopping of the SRS has not been activated (i.e., b)_hop≥B_SRS) Then the frequency position index n_bIs always maintained (not reconfigured) and is made ofAnd (4) defining. In this case, n_RRCGiven by the higher layer parameters freqDomainPosition and freqDomainPosition-ap for each configuration relative to periodic and aperiodic transmissions.

If frequency hopping of the SRS has been enabled (i.e., b)_hop<B_SRS) Then the frequency position index n can be defined as follows_b。

In this case, regardless of the value N in tables 4 to 7_bIn what way the user can, however,n_srsmay be based on the following equation.

n_srsThe number of UE-specific SRS transmissions is counted. In this case, T_SRSIs the UE-specific periodicity of SRS transmission as defined in paragraph 8.2 of 3GPP TS 36.213, and T_offsetIs the SRS subframe offset defined in table 8.2-2 of 3GPP TS 36.213. T is_{offset_max}T being a specific configuration of SRS subframe offsets_offsetA maximum value.

In this case, in option 2, the symbol index where the guard symbol can be placed can be re-indexed in one subframe with respect to the corresponding UE within a range where an additional SRS (which may span the SRS symbol) can be configured, as shown in proposal 2.

[ proposal 4]

The base station may configure in the UE the number and location of SRS symbols to be actually transmitted in addition to the gap symbols (within the subframe) through higher layer signaling as part of the additional SRS configuration (when the UE needs gap symbols at frequency hopping and/or antenna switching). The configuration method may be based on at least one of the following options.

In the UE, when there are gap symbols described in proposal 3, the SRS symbol index and the number of symbols may be counted in addition to the corresponding gap symbols. For example, as in option 1 of proposal 3, when three gap symbols are configured, if eight SRS symbols have been configured, eight SRS symbols refer to the number of symbols in which SRS is actually transmitted in addition to three gap symbols. In addition, the SRS symbol index may be re-indexed with respect to the symbol actually transmitting the SRS.

Option 1)

The base station may configure the number of SRS symbols and may configure the SRS symbol positions in a bitmap form. For example, the position of the SRS symbol can be represented as 13 bits by considering the symbol index (index 13, i.e., except for the last symbol) in the range of 0-12 where the additional SRS can be configured in one subframe. For example, if the bitmap is 1101101101100, the SRS is configured in 1,2,4,5,7,8,10,11 symbols (symbol indexes 0,1, 3,4,6,7, 9, and 10) (eight SRS symbols in total). In this case, the SRS symbol index actually transmitted by the UE may be indexed again from 0 to 7 for eight SRS symbols.

Option 2)

The base station may configure the number of SRS symbols and may configure the SRS symbol positions in the form of equations. For example, in option 2 of proposal 3, symbols other than gap symbols satisfying the conditions in examples 1), 2), and 3) (i.e., symbols corresponding to a complementary set of a set including gap symbols based on option 2 of proposal 3 in a subframe in which SRS is configured) may be configured as SRS symbol positions. For example, in example 1), the SRS symbol may be configured in a symbol index n that does not satisfy (n +1) mod (R +1) ═ 0.

Also, in this case, the symbol index where the SRS symbol is located in option 2 may be re-indexed in a range (across which the SRS symbol may span) in which an additional SRS may be configured in one subframe in the corresponding UE, as in proposal 2.

[ proposal 5]

Hereinafter, if the frequency hopping/repeating operation and/or the antenna switching operation have been configured, the number of SRS transmissions (n) is described_SRS) Counting method and antenna switching method. In this case, the number of symbols of the additional SRS means the number of symbols in which the SRS is actually transmitted except for the gap symbol. In addition, the symbol index may be re-indexed with respect to the symbol in which the SRS is actually transmitted.

For example, if only UE hopping/repetition is configured, it may be based onCounting the number of transmissions of the SRS (value n)_SRSIncreased). In this case, l' denotes a re-indexed SRS symbol index. When n is_SRSWhen increasing, frequency hopping may be performed.

N may be based on if only UE antenna switching is configured_SRSThe number of transmissions of the SRS is counted. In this case, l' refers to the re-indexed SRS symbol index. By corresponding operation, for example, at the time of antenna switching operation of 1T4R, as long as at a (n)_SRS)＝n_SRSIn mod 4, n is increased_SRSConventional antenna switching operations may be supported in the form of changing antenna ports. In this case, the index a (n)_SRS) Shows the number n_SRSA UE antenna port transmitting the SRS.

Specifically, for example, based on the Rel-15 LTE specification, including operations related to "a (srs) -nSRS mod 4" for 1T4R, antenna port switching occurs as nSRS increases. In the current LTE specifications, the granularity of nssrs is subframe level. In this case, in order to update nSRS for symbol-level granularity, the counter nSRS needs to be updated as follows.

If only antenna switching is configured in the UE, the nSRS may be increased by an OFDM symbol number l (e.g., nSRS ═ l'). In this case, l' is a counting variable renumbered with respect to the actual SRS transmission.

If both frequency hopping/repetition and antenna switching have been configured in the UE at the same time, it may be based onCounting the number of transmissions of the SRS (n)_SRSThe value increases). In this case, l' refers to the re-indexed SRS symbol index.

In the existing antenna switching operation, for example, at the time of 1T4R antenna switching operation, it is possible to adoptIs referred to as a (n) as_SRS)＝n_SRSA (n) of mod 4_SRS) By a factor n included in the function of_SRSUnlike prior methods (e.g.,). Equation ofMay correspond to the number of transitions (the corresponding number of transitions may depend on the value b_hopBut not, the number of hops is used to completely cover the frequency hopping bandwidth (e.g., b) by changing the frequency band when configuring the frequency hopping_hop<B_SRS) But the configured SRS bandwidth. By means of the corresponding equation, the antenna ports can be kept as many as the number of hops employed to fully cover the SRS bandwidth configured by frequency hopping.

By the respective operations of associating the Nb parameters, gap symbols attributable to antenna switching can be minimized and waste of resources can be reduced due to frequency hopping/repetition operations prior to antenna switching.

However, if antenna switching and frequency repetition/hopping are configured at the same time, the aforementioned operation "a (nrsrs) ═ nrsrs mod 4" may be modified to appropriately accommodate the frequency hopping/repeating operation based on the assumption that frequency hopping/repetition is applied first and then antenna switching is applied. The above operation may therefore be modified such that if both antenna switching and frequency hopping/repetition have been configured in the UE (e.g., for 1T4R,nb is based on the values of tables 4 to 7), the UE antenna (e.g., a (nSRS)) transmitting the SRS in the nSRS is changed after sounding all hopping bands.

The proposed operation is not limited to an operation based simply on the above equation, and may also include a case where the above equation is extended.

According to an embodiment, the signaling procedure between the UE and the base station based on the method 1 may be performed as follows.

Step 0) receiving SRS configuration based on at least one of proposals 1-5 (UE capability reporting may be performed as in proposal 1 heretofore)

Step 0-1) receives a configuration for transmitting an SRS in one or more symbols.

Step 0-1-1) information that can be included in the configuration (36.331sounding gRS-UL-Config)

Step 0-2) the SRS configuration may include periodically and/or aperiodically transmitted SRS-related information.

Step 2) if an SRS trigger is received through a DL/UL grant (through PDCCH) or if an SRS transmission timing based on RRC configuration is reached

Step 1-1) SRS Transmission with respect to resources capable of SRS Transmission based on proposals 2-5

All steps are not necessary and some steps may be omitted or added depending on the circumstances of the UE.

In an implementation aspect, operations of a base station/UE according to the foregoing embodiments (e.g., operations related to transmission of SRS based on at least one of proposal 1/proposal 2/proposal 3/proposal 4/proposal 5) may be processed by the later-described apparatus in fig. 12-16 (e.g., processors 102, 202 in fig. 13).

Further, operations of a base station/UE according to the foregoing embodiments (e.g., operations related to transmission of SRS based on at least one of proposal 1/proposal 2/proposal 3/proposal 4/proposal 5) may be stored in a memory (e.g., 104, 204 in fig. 13) in the form of instructions/programs (e.g., instructions, executable code) for driving at least one processor (e.g., 102, 202 in fig. 13).

Fig. 9 is a flowchart for describing an operation of a UE to which the method proposed in the present disclosure may be applied. Fig. 9 is for convenience of description only, and does not limit the scope of the present disclosure.

Referring to fig. 9, assume a case where the UE performs uplink transmission (e.g., UL channel, additional SRS) based on the method described in method 1 (e.g., proposal 1/proposal 2/proposal 3/proposal 4/proposal 5).

The UE may receive an SRS configuration from a base station or the like (S910). For example, as in method 1 (e.g., step 0 in proposal 1/proposal 2/proposal 3/proposal 4/proposal 5), the UE may receive an SRS configuration including information related to the SRS (e.g., additional SRS, UpPts SRS). For example, the SRS configuration may be received through RRC signaling

The UE may receive DCI related to transmission of SRS and/or UL channels (S920). Alternatively, information related to transmission of SRS and/or UL channels may be replaced with RRC configuration. For example, the DCI may include information that triggers SRS. For example, the RRC configuration may be the SRS configuration described in S910. For example, the RRC configuration may include information (e.g., periodicity/offset) related to SRS transmission timing.

Thereafter, the UE may transmit the SRS and/or UL channel (S) based on the received SRS configuration, DCI, and/or predefined rules (e.g., gap symbol position, SRS symbol position, or SRS symbol index) (S930). For example, in a multi-symbol SRS transmission, the UE may transmit SRS and/or UL channel(s) with respect to the resources described and configured in method 1 (e.g., proposal 1/proposal 2/proposal 3/proposal 4/proposal 5).

In fig. 9, it is apparent that a reception operation of the UE may be understood as a transmission operation of the base station, and a transmission operation of the UE may be understood as a reception operation of the base station.

As described above, method 1 (e.g., propose 1/propose 2/propose 3/propose 4/propose 5/FIG. 9) may be implemented by a device (e.g., FIGS. 12-16) as will be described below. For example, the UE may correspond to a first wireless device, the base station may correspond to a second wireless device, and the opposite may also be considered as the case may be.

For example, method 1 (e.g., offer 1/offer 2/offer 3/offer 4/offer 5/FIG. 9) may be processed by one or more processors (e.g., 102/202) in FIGS. 12-16. Method 1 (e.g., offer 1/offer 2/offer 3/offer 4/offer 5/fig. 9) may be stored in a memory (e.g., one or more memories (e.g., 104/204) of fig. 13) in the form of instructions/programs (e.g., instructions, executable code) for driving at least one processor (e.g., 102/202) in fig. 12-16.

Hereinafter, the above-described embodiment is specifically described with reference to fig. 10 in terms of the operation of the UE. The methods described below are divided only for convenience of description, and some elements of any one method may be replaced with some elements of another method, and may be combined with and applied to each other.

Fig. 10 is a flowchart for describing a method of transmitting a sounding reference signal by a UE in a wireless communication system according to an embodiment of the present disclosure.

Referring to fig. 10, a method for transmitting a Sounding Reference Signal (SRS) by a UE in a wireless communication system according to an embodiment of the present disclosure may include an SRS configuration information receiving step S1010 and an SRS transmitting step S1020.

In S1010, the UE receives configuration information related to transmission of a Sounding Reference Signal (SRS) from a base station.

According to an embodiment, the SRS may be configured in a region consisting of at least one symbol except for the last symbol of the subframe. The SRS may be based on the additional SRS.

The region may include a certain number of guard symbols. The guard symbols may relate to at least one of frequency hopping or antenna switching of the SRS. The present embodiment may be based on either proposal 1 or proposal 2.

According to an embodiment, the specific number may be determined based on at least one of frequency hopping or antenna switching. For example, a guard symbol may be configured between symbols that perform frequency hopping or between symbols that perform antenna switching.

According to an embodiment, the number of transmissions of the SRS may be determined based on a factor related to repetition of the SRS and a specific symbol index.

This embodiment may be based on proposal 5. In particular of SRSThe number of transmissions may be n in proposal 5_SRSThe factor may be a repetition factor R and the particular symbol index may be l'.

The specific symbol index may be associated with symbols other than a specific number of guard symbols among the symbols within the region. In particular, the specific symbol index may be based on an SRS symbol index re-indexed according to a symbol in which the SRS is transmitted in the region where the SRS is configured.

Frequency hopping or antenna switching may be performed based on the number of transmissions. For example, frequency hopping may be performed based on an increased number of transmissions.

Frequency hopping can be performed earlier than antenna switching. The antenna switching may be performed based on at least one of a number of hops or a number of transmissions performed over a bandwidth in which transmission of the SRS is configured.

Specifically, the antenna port through which the SRS is transmitted is changed by antenna switching. May be based on the number of transmissions n_SRSAnd changing an index a (n) of an antenna port transmitting the SRS by fully covering the number of hops (i.e., the number of hops) taken by the SRS bandwidth configured by changing the frequency band by the hop bandwidth_SRS). That is, a (n) may be determined based on a value obtained by dividing the number of transmissions by the number of hopping frequencies performed over a bandwidth configuring transmission of the SRS_SRS). Thus, the antenna port may be equally maintained by the number of hops employed to fully cover the configured SRS bandwidth.

According to an embodiment, the configuration information may comprise information relating to the area. The information related to the region may include information on at least one of the number of symbols or the position of the symbols. The present embodiment may be based on at least one of proposal 2, proposal 3, or proposal 4.

The number of symbols or the position of the symbols may be related to at least one of the symbols or the guard symbols from which the SRS is transmitted.

For example, the position of the symbol may be based on a starting symbol index. The number of symbols may be based on the number of symbols across the region. In this case, the number of symbols may include the number of guard symbols and the number of symbols through which the SRS is transmitted. That is, the number of symbols may be based on the sum of the number of guard symbols and the number of symbols transmitting the SRS.

According to S1010, the operation of receiving, by the UE (100/200 in fig. 12 to 16), configuration information related to transmission of a Sounding Reference Signal (SRS) from the base station (100/200 in fig. 12 to 16) may be implemented by the apparatuses of fig. 12 to 16. For example, referring to fig. 13, the one or more processors 102 may control the one or more transceivers 106 and/or the one or more memories 104 to receive configuration information from the base station 200 related to transmission of Sounding Reference Signals (SRS).

The method may further include a UE capability information transmission step before S1010. In the UE capability information transmission step, the UE may transmit UE capability information regarding whether the guard symbol is configured to the base station. The UE capability information may be based on proposal 1. The UE capability information may indicate whether a guard symbol configuration is necessary. Whether to configure the guard symbol may be determined based on the UE capability information. The guard symbols may or may not be configured based on the UE capability information, and the specific number may be based on an integer of 0 or more.

The operation of transmitting, by the UE (100/200 in fig. 12 to 16), the UE capability information on whether the guard symbol is configured to the base station (100/200 in fig. 12 to 16) according to the UE capability information transmission step may be implemented by the apparatuses of fig. 12 to 16. For example, referring to fig. 13, the one or more processors 102 may control the one or more transceivers 106 and/or the one or more memories 104 to transmit UE capability information to the base station 200 regarding whether to configure protection symbols.

In S1020, the UE transmits an SRS to the base station.

The SRS is transmitted in a symbol except a certain number of guard symbols among symbols within a region where the SRS is configured.

According to S1020, the operation of transmitting, by the UE (100/200 in fig. 12 to 16), the SRS to the base station (100/200 in fig. 12 to 16) may be implemented by the apparatuses of fig. 12 to 16. For example, referring to fig. 13, the one or more processors 102 may control the one or more transceivers 106 and/or the one or more memories 104 to transmit the SRS to the base station 200.

Hereinafter, the above-described embodiment is specifically described with reference to fig. 11 in terms of the operation of the base station. The methods described below are merely for convenience of description, and some elements of any one method may be replaced with some elements of another method, and may be combined with and applied to each other.

Fig. 11 is a flowchart for describing a method of receiving a sounding reference signal by a base station in a wireless communication system according to another embodiment of the present disclosure.

Referring to fig. 11, a method of receiving a sounding reference signal by a base station in a wireless communication system according to another embodiment of the present disclosure may include an SRS configuration information transmission step S1110 and an SRS reception step S1120.

In S1110, the base station transmits configuration information related to transmission of a Sounding Reference Signal (SRS) to the UE.

According to an embodiment, the SRS may be configured in a region consisting of at least one symbol except for the last symbol of the subframe. The SRS may be based on the additional SRS.

The region may include a certain number of guard symbols. The guard symbols may relate to at least one of frequency hopping or antenna switching of the SRS. The present embodiment may be based on either proposal 1 or proposal 2.

According to an embodiment, the specific number may be determined based on at least one of frequency hopping or antenna switching. For example, a guard symbol may be configured between symbols that perform frequency hopping or between symbols that perform antenna switching.

According to an embodiment, the number of transmissions of the SRS may be determined based on a factor related to repetition of the SRS and a specific symbol index.

This embodiment may be based on proposal 5. Specifically, the number of transmissions of SRS may be n in proposal 5_SRSThe factor may be a repetition factor R and the particular symbol index may be l'.

The specific symbol index may be associated with symbols other than a specific number of guard symbols among the symbols within the region. In particular, the specific symbol index may be based on an SRS symbol index re-indexed according to a symbol in which the SRS is transmitted in the region where the SRS is configured.

Frequency hopping or antenna switching may be performed based on the number of transmissions. For example, frequency hopping may be performed based on an increased number of transmissions.

Frequency hopping can be performed earlier than antenna switching. The antenna switching may be performed based on at least one of a number of hops or a number of transmissions performed over a bandwidth configuring transmission of the SRS.

Specifically, the antenna port through which the SRS is transmitted is changed by antenna switching. May be based on the number of transmissions n_SRSAnd changing an index a (n) of an antenna port transmitting the SRS by fully covering the number of hops (i.e., the number of hops) taken by the SRS bandwidth configured by changing the frequency band by the hop bandwidth_SRS). That is, a (n) may be determined based on a value obtained by dividing the number of transmissions by the number of hopping frequencies performed over a bandwidth configuring transmission of the SRS_SRS). Thus, the antenna port may be equally maintained by the number of hops employed to fully cover the configured SRS bandwidth.

According to an embodiment, the configuration information may comprise information relating to the area. The information related to the region may include information on at least one of the number of symbols or the position of the symbols. The present embodiment may be based on at least one of proposal 2, proposal 3, or proposal 4.

The number of symbols or the position of the symbols may be related to at least one of the symbols or the guard symbols from which the SRS is transmitted.

For example, the position of the symbol may be based on a starting symbol index. The number of symbols may be based on the number of symbols across the region. In this case, the number of symbols may include the number of guard symbols and the number of symbols through which the SRS is transmitted. That is, the number of symbols may be based on the sum of the number of guard symbols and the number of symbols transmitting the SRS.

According to S1110, the operation of transmitting, by the base station (100/200 in fig. 12 to 16), configuration information related to transmission of a Sounding Reference Signal (SRS) to the UE (100/200 in fig. 12 to 16) may be implemented by the apparatuses of fig. 12 to 16. For example, referring to fig. 13, the one or more processors 202 may control the one or more transceivers 206 and/or the one or more memories 204 to transmit configuration information related to transmission of Sounding Reference Signals (SRS) to the UE 100.

The method may further include a base station capability information receiving step before S1110. In the base station capability information receiving step, the base station may receive UE capability information on whether the guard symbol is configured or not from the UE. The base station capability information may be based on proposal 1.

The base station capability information may indicate whether a guard symbol needs to be configured. Whether to configure the guard symbol may be determined based on the UE capability information. The guard symbols may or may not be configured based on the UE capability information. The specific number may be based on an integer of 0 or more.

The operation of receiving, by the base station (100/200 in fig. 12 to 16), UE capability information about whether to configure a guard symbol from the UE (100/200 in fig. 12 to 16) according to the UE capability information receiving step may be implemented by the apparatuses of fig. 12 to 16. For example, referring to fig. 13, the one or more processors 202 may control the one or more transceivers 206 and/or the one or more memories 204 to receive UE capability information from the UE 100 regarding whether to configure protection symbols.

In S1120, the base station receives an SRS from the UE.

The SRS is transmitted in a symbol except a certain number of guard symbols among symbols within a region where the SRS is configured.

The operation of receiving, by the base station (100/200 in fig. 12 to 16), the SRS from the UE (100/200 in fig. 12 to 16) according to S1120 may be implemented by the apparatuses of fig. 12 to 16. For example, referring to fig. 13, the one or more processors 202 may control the one or more transceivers 206 and/or the one or more memories 204 to receive SRS from the UE 100.

Examples of communication systems applied to the present disclosure

The various descriptions, functions, processes, proposals, methods and/or operational flow diagrams of the present disclosure described in this document may be applied to, but are not limited to, various fields requiring wireless communication/connection (e.g., 5G) between devices.

Hereinafter, detailed description will be made with reference to the accompanying drawings. In the following drawings/description, the same reference numerals may denote the same or corresponding hardware, software, or functional blocks, unless otherwise specified.

Fig. 12 illustrates a communication system 1 applied to the present disclosure.

Referring to fig. 12, a communication system 1 applied to the present disclosure includes a wireless device, a Base Station (BS), and a network. Herein, a wireless device denotes a device that performs communication using a Radio Access Technology (RAT) (e.g., 5G new RAT (nr)) or Long Term Evolution (LTE), and may be referred to as a communication/radio/5G device. The wireless devices may include, but are not limited to, a robot 100a, vehicles 100b-1 and 100b-2, an augmented reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an internet of things (IoT) device 100f, and an Artificial Intelligence (AI) device/server 400. For example, the vehicle may include a vehicle having a wireless communication function, an autonomous vehicle, and a vehicle capable of communicating between vehicles. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (e.g., drone). The XR device may include an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) device, and may be implemented in the form of a Head Mounted Device (HMD), a Heads Up Display (HUD) installed in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, and the like. Handheld devices may include smart phones, smart pads, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., laptops). The home appliances may include a television, a refrigerator, and a washing machine. The IoT devices may include sensors and smart meters. For example, the BS and network may be implemented as wireless devices, and a particular wireless device 200a may operate as a BS/network node with respect to other wireless devices.

The wireless devices 100a to 100f may connect to the network 300 through the BS 200. The AI technique may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may connect to the AI server 400 through the BS. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other through the BS 200/network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without passing through the BS/network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V)/vehicle-to-all (V2X) communication). IoT devices (e.g., sensors) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100 a-100 f.

Wireless communications/connections 150a, 150b, or 150c may be established between wireless devices 100 a-100 f/BS 200 or BS 200/BS 200. Here, the wireless communication/connection may be established through various RATs (e.g., 5G NR) such as uplink/downlink communication 150a, sidelink communication 150b (or D2D communication), or inter-BS communication (e.g., relay, Integrated Access Backhaul (IAB)). The wireless device and the BS/wireless device may transmit/receive radio signals between each other through wireless communications/connections 150a and 150 b. For example, wireless communications/connections 150a and 150b may transmit/receive signals over various physical channels. To this end, at least a part of various configuration information configuration procedures for transmitting/receiving radio signals, various signal processing procedures (e.g., channel coding/decoding, modulation/demodulation, and resource mapping/demapping), and resource allocation procedures may be performed based on various proposals of the present disclosure.

Examples of wireless devices suitable for use in the present disclosure

Fig. 13 illustrates a wireless device suitable for use with the present disclosure.

Referring to fig. 13, the first wireless device 100 and the second wireless device 200 may transmit radio signals through various RATs (e.g., LTE and NR). Here, { first wireless device 100 and second wireless device 200} may correspond to { wireless device 100x and BS 200} and/or { wireless device 100x and wireless device 100x } of fig. 12.

The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may additionally include one or more transceivers 106 and/or one or more antennas 108. The processor 102 may control the memory 104 and/or the transceiver 106 and may be configured to implement the descriptions, functions, procedures, proposals, methods and/or operational flow diagrams disclosed in this document. For example, the processor 102 may process the information in the memory 104 to generate a first information/signal and then transmit a radio signal including the first information/signal through the transceiver 106. The processor 102 may receive the radio signal including the second information/signal through the transceiver 106 and then store information obtained by processing the second information/signal in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may store software code including instructions for performing some or all of the processes controlled by the processor 102, or for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flow diagrams disclosed in this document. Here, the processor 102 and memory 104 may be part of a communication modem/circuit/chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and/or receive radio signals through one or more antennas 108. Each transceiver 106 may include a transmitter and/or a receiver. The transceiver 106 may be used interchangeably with a Radio Frequency (RF) unit. In this disclosure, a wireless device may represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202 and one or more memories 204, and additionally include one or more transceivers 206 and/or one or more antennas 208. The processor 202 may control the memory 204 and/or the transceiver (206) and may be configured to implement the descriptions, functions, procedures, proposals, methods and/or operational flow diagrams disclosed in this document. For example, processor 202 may process information within memory 204 to generate a third information/signal and then transmit a radio signal including the third information/signal through transceiver 206. The processor 202 may receive a radio signal including the fourth information/signal through the transceiver 206 and then store information obtained by processing the fourth information/signal in the memory 204. The memory 204 may be connected to the memory 204 and may store various information related to the operation of the processor 202. For example, the memory 204 may store software code including instructions for performing some or all of the processes controlled by the processor or for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flow diagrams disclosed in this document. Here, the processor 202 and memory 204 may be part of a communication modem/circuit/chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and/or receive radio signals through one or more antennas 208. Each transceiver 206 may include a transmitter and/or a receiver. The transceiver 206 may be used interchangeably with the RF unit. In this disclosure, a wireless device may represent a communication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). The one or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods and/or operational flow diagrams disclosed in this document. The one or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flow diagrams disclosed in this document. The one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flow diagrams disclosed in this document and provide the generated signals to the one or more transceivers 106 and 206. The one or more processors 102 and 202 can receive signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and retrieve PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, recommendations, methods, and/or operational flow diagrams disclosed in this document.

The one or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. The one or more processors 102 and 202 may be implemented in hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in the one or more processors 102 and 202. The descriptions, functions, procedures, proposals, methods and/or operational flow diagrams disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, procedures or functions. Firmware or software configured to perform the descriptions, functions, procedures, proposals, methods and/or operational flow diagrams disclosed in this document may be included in the one or more processors 102 and 202 or stored in the one or more memories 104 and 204 so as to be driven by the one or more processors 102 and 202. The descriptions, functions, procedures, proposals, methods and/or operational flow diagrams disclosed in this document may be implemented using firmware or software in the form of codes, commands and command sets.

The one or more memories 104 and 204 may be coupled to the one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and/or commands. The one or more memories 104 and 204 may be configured from read-only memory (ROM), random-access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drives, registers, buffer memory, computer-readable storage media, and/or combinations thereof. The one or more memories 104 and 204 may be internal and/or external to the one or more processors 102 and 202. The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 through various techniques, such as wired or wireless connections.

One or more transceivers 106 and 206 may transmit user data, control information, and/or radio signals/channels referred to in the method and/or operational flow diagrams of this document to one or more other devices. The one or more transceivers 106 and 206 may receive user data, control information, and/or radio signals/channels from one or more other devices mentioned in the description, functions, procedures, proposals, methods and/or operational flow diagrams disclosed in this document. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and transmit and receive radio signals. For example, one or more processors 102 and 202 may perform control such that one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices. The one or more processors 102 and 202 may perform control such that the one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to transmit and receive, through one or more antennas 108 and 208, user data, control information, and/or radio signals/channels mentioned in the description, functions, procedures, proposals, methods and/or operational flow diagrams disclosed in this document. In this document, the one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). The one or more transceivers 106 and 206 may convert received radio signals/channels, etc. from RF band signals to baseband signals to facilitate processing of received user data, control information, radio signals/channels, etc. using the one or more processors 102 and 202. The one or more transceivers 106 and 206 may convert user data, control information, radio signals/channels, etc. processed using the one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include an (analog) oscillator and/or a filter.

Examples of signal processing circuits applied to the present disclosure

Fig. 14 illustrates a signal processing circuit for transmitting signals.

Referring to fig. 14, the signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060. The operations/functions of fig. 14 may be performed by, but are not limited to, the processors 102 and 202 and/or the transceivers 106 and 206 of fig. 13. The hardware elements of fig. 14 may be implemented by the processors 102 and 202 and/or the transceivers 106 and 206 of fig. 13. For example, blocks 1010 through 1060 may be implemented by processors 102 and 202 of fig. 13. Alternatively, blocks 1010 through 1050 may be implemented by processors 102 and 202 of fig. 13, and block 1060 may be implemented by transceivers 106 and 206 of fig. 13.

The code words may be converted into radio signals via the signal processing circuit 1000 of fig. 14. Herein, a codeword is a coded bit sequence of an information block. The information block may comprise a transport block (e.g., UL-SCH transport block, DL-SCH transport block). The radio signal may be transmitted through various physical channels (e.g., PUSCH and PDSCH).

In particular, the codeword may be converted to a scrambled bit sequence by scrambler 1010. A scrambling sequence for scrambling may be generated based on an initialization value, and the initialization value may include ID information of the wireless device. The scrambled bit sequence may be modulated into a modulation symbol sequence by a modulator 1020. The modulation schemes may include pi/2-binary phase shift keying (pi/2-BPSK), m-phase shift keying (m-PSK), and m-quadrature amplitude modulation (m-QAM). The complex modulation symbol sequences may be mapped to one or more transmission layers by a layer mapper 1030. The modulation symbols for each transmission layer may be mapped (precoded) by precoder 1040 to the corresponding antenna ports. The output z of the precoder 1040 may be obtained by multiplying the output y of the layer mapper 1030 by the N × M precoding matrix W. Herein, N is the number of antenna ports and M is the number of transport layers. The precoder 1040 may perform precoding after performing transform precoding (e.g., DFT) on the complex modulation symbols. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.

Resource mapper 1050 may map the modulation symbols for each antenna port to time-frequency resources. The time-frequency resources may include a plurality of symbols in the time domain (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) and a plurality of subcarriers in the frequency domain. The signal generator 1060 may generate a radio signal from the mapped modulation symbols and may transmit the generated radio signal to other devices through each antenna. For this purpose, the signal generator 1060 may include an Inverse Fast Fourier Transform (IFFT) module, a Cyclic Prefix (CP) inserter, a digital-to-analog converter (DAC), and a frequency up-converter.

The signal processing procedure for signals received in the wireless device may be configured in a reverse manner of the signal processing procedures 1010 through 1060 of fig. 14. For example, a wireless device (e.g., 100 and 200 of fig. 13) may receive radio signals from the outside through an antenna port/transceiver. The received radio signal may be converted into a baseband signal by a signal recoverer. To this end, the signal recoverer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a Fast Fourier Transform (FFT) module. Next, the baseband signal may be restored to a codeword through a resource demapping process, a post-encoding process, a demodulation processor, and a descrambling process. The code words can be restored to the original information blocks by decoding. Accordingly, a signal processing circuit (not shown) for receiving a signal may include a signal recoverer, a resource demapper, a post-encoder, a demodulator, a descrambler, and a decoder.

Examples of wireless devices for application to the present disclosure

Fig. 15 illustrates another example of a wireless device applied to the present disclosure. The wireless device may be implemented in various forms according to use cases/services (refer to fig. 12).

Referring to fig. 15, wireless devices 100 and 200 may correspond to wireless devices 100 and 200 of fig. 13 and may be configured by various elements, components, units/sections, and/or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional components 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuitry 112 may include one or more processors 102 and 202 and/or one or more memories 104 and 204 in fig. 13. For example, the transceiver 114 may include one or more transceivers 106 and 206 and/or one or more antennas 108 and 208 of fig. 13. The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 may control the electrical/mechanical operation of the wireless device based on programs/codes/commands/information stored in the storage unit 130. The control unit 120 may transmit information stored in the storage unit 130 to the outside (e.g., other communication devices) through a wireless/wired interface via the communication unit 110 or store information received from the outside (e.g., other communication devices) through a wireless/wired interface in the storage unit 130 via the communication unit 110.

The additional components 140 may be configured differently depending on the type of wireless device. For example, the add-on components 140 may include at least one of a power unit/battery, an input/output (I/O) unit, a drive unit, and a computing unit. The wireless device may be implemented in the form of, but not limited to, a robot (100 a of fig. 12), a vehicle (100 b-1 and 100b-2 of fig. 12), an XR device (100 c of fig. 12), a handheld device (100 d of fig. 12), a home appliance (100 e of fig. 12), an IoT device (100 f of fig. 12), a digital broadcast terminal, a holographic device, a public safety device, an MTC device, a medical device, a financial technology device (or financial device), a security device, a climate/environment device, an AI server/device (400 of fig. 12), a BS (200 of fig. 12), a network node, and the like. Depending on the use case/service, the wireless device may be used in a mobile or fixed location

In fig. 15, the entirety of various elements, components, units/sections, and/or modules in the wireless devices 100 and 200 may be connected to each other through a wired interface, or at least a part thereof may be wirelessly connected through a communication unit. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be connected by wire, and the control unit 120 and the first unit (e.g., 130 and 140) may be connected wirelessly through the communication unit 110. Each element, component, unit/portion, and/or module within wireless devices 100 and 200 may further include one or more elements. For example, the control unit 120 may be configured by a set of one or more processors. As an example, the control unit 120 may be configured by a set of a communication control processor, an application processor, an Electronic Control Unit (ECU), a graphics processing unit, and a memory control processor. As another example, the memory 130 may be configured by Random Access Memory (RAM), dynamic RAM (dram), Read Only Memory (ROM), flash memory, volatile memory, non-volatile memory, and/or combinations thereof.

Examples of hand-held devices for application to the present disclosure

Fig. 16 illustrates a handheld device applied to the present disclosure. The handheld device may include a smart phone, a smart pad, a wearable device (e.g., a smart watch or smart glasses), or a portable computer (e.g., a notebook). The handheld device may be referred to as a Mobile Station (MS), a User Terminal (UT), a mobile subscriber station (MSs), a Subscriber Station (SS), an Advanced Mobile Station (AMS), or a Wireless Terminal (WT).

Referring to fig. 16, the handheld device 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an I/O unit 140 c. The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110 to 130/140a to 140c correspond to blocks 110 to 130/140 of fig. 15, respectively.

The communication unit 110 may transmit and receive signals (e.g., data and control signals) to and from other wireless devices or BSs. The control unit 120 may perform various operations by controlling the constituent elements of the handheld device 100. The control unit 120 may include an Application Processor (AP). The memory unit 130 may store data/parameters/programs/codes/commands required to drive the handheld device 100. The memory unit 130 may store input/output data/information. The power supply unit 140a may supply power to the handheld device 100 and include a wired/wireless charging circuit, a battery, and the like. The interface unit 140b may support the connection of the handheld device 100 to other external devices. The interface unit 140b may include various ports (e.g., audio I/O ports and video I/O ports) for connecting with external devices. The I/O unit 140c may input or output video information/signals, audio information/signals, data, and/or information input by a user. The I/O unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and/or a haptic module.

As an example, in the case of data communication, the I/O unit 140c may acquire information/signals (e.g., touch, text, voice, image, or video) input by a user and may store the acquired information/signals in the memory unit 130. The communication unit 110 may convert information/signals stored in the memory into radio signals and transmit the converted radio signals directly to other wireless devices or to the BS. The communication unit 110 may receive a radio signal from other wireless devices or BSs and then restore the received radio signal to original information/signals. The recovered information/signals may be stored in the memory unit 130 and may be output as various types (e.g., text, voice, image, video, or tactile) through the I/O unit 140 c.

Effects of the method and apparatus for transmitting and receiving a sounding reference signal in a wireless communication system according to an embodiment of the present disclosure are described as follows.

According to an embodiment of the present disclosure, a region where transmission of the SRS is configured includes a certain number of guard symbols. The guard symbols may relate to at least one of frequency hopping or antenna switching. Ambiguity of UE operation through configuration of guard symbols can be removed if frequency hopping and antenna switching operations are configured. Further, there are the following effects: the SRS capacity can be guaranteed from the perspective of multi-UEs, and the SRS transmittable range between UEs is not invaded.

According to an embodiment of the present disclosure, the number of transmissions of the SRS may be determined based on a factor related to repetition of the SRS and a specific symbol index. The specific symbol index may be associated with symbols other than a specific number of guard symbols among the symbols within the region. Frequency hopping or antenna switching may be performed based on the number of transmissions. Frequency hopping can be performed earlier than antenna switching. The antenna switching may be performed based on at least one of a number of hops or a number of transmissions performed over a bandwidth configuring transmission of the SRS.

Accordingly, frequency hopping or antenna switching can be performed based on the number of transmissions of the SRS. Furthermore, the accuracy of DL CSI acquisition may be improved because the antenna switching operation is maintained with the same antenna port while frequency hopping is performed in association with the number of frequency hopping. Since the frequency hopping/repeating operation is completed before the antenna switching, the guard symbols attributable to the antenna switching can be minimized, and the waste of resources can be reduced.

According to an embodiment of the present disclosure, UE capability information related to configuration of guard symbols may be transmitted. Whether to configure the guard symbol may be determined based on the capability of the corresponding UE. Accordingly, resources can be reduced because the guard symbols are not configured for the UE having poor capability, and degradation of the SRS transmission symbols attributable to the power transition period can be prevented because the guard symbols are configured with respect to the UE having no poor capability.

In the above embodiments, the elements and features of the present invention have been combined in specific forms. Each element or feature may be considered optional unless explicitly described otherwise. Each element or feature may be implemented in a form not combined with other elements or features. Furthermore, some elements and/or features may be combined to form an embodiment of the invention. The order of operations described in the embodiments of the present invention may be changed. Some elements or features of an embodiment may be included in another embodiment or may be replaced with corresponding elements or features of another embodiment. It is obvious that an embodiment may be constructed by combining claims not having an explicit reference relationship in the claims, or may be included as a new claim by amendment after the application is filed.

Embodiments in accordance with the present invention may be implemented by various means, such as hardware, firmware, software, or a combination thereof. In the case of implementation by hardware, embodiments of the present invention may be implemented using one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, or the like.

In the case of implementation by firmware or software, the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function for performing the above-described functions or operations. The software codes may be stored in a memory and driven by a processor. The memory may be located internal or external to the processor and may exchange data with the processor in a variety of known ways.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the essential characteristics thereof. The detailed description is, therefore, not to be taken in a limiting sense, but is to be construed in an illustrative sense. The scope of the invention should be determined by reasonable analysis of the appended claims and all changes that come within the meaning and range of equivalency of the invention are intended to be embraced therein.