Method and apparatus for transmitting or receiving sounding reference signal in wireless communication system

Abstract

A method according to an embodiment of the present specification comprises the steps of: reporting channel state information (CSI); and transmitting a sounding reference signal (SRS). The CSI includes at least one DL RS resource indicator. The SRS is transmitted based on the at least one SRS resource. An uplink transmission spatial filter (UL Tx spatial filter) related to the at least one SRS resource is determined based on the at least one DL RS resource indicator.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for transmitting and receiving a sounding reference signal in a wireless communication system. Background Art

[0002] In order to provide voice services while ensuring user activities, a mobile communication system has been developed. However, the area of ​​the mobile communication system has been expanded to data services in addition to voice. Due to the current explosive increase in traffic, resource shortages have occurred, so users need higher-speed services. Therefore, a more advanced mobile communication system is needed.

[0003] The requirements for next generation mobile communication systems need to be able to support the accommodation of explosive data traffic, a significant increase in data rates per user, an accommodation of a significant increase in the number of connected devices, very low end-to-end latency, and high energy efficiency. To this end, various technologies have been studied, such as dual connectivity, massive multiple-input multiple-output (MIMO), in-band full-duplex, non-orthogonal multiple access (NOMA), ultra-wideband support, and device networking.

[0004] In Rel-18 MIMO, research has begun on methods to support simultaneous transmission across multiple panels (STxMP). Codebook-based SRS transmission (or non-codebook-based SRS transmission) is required for each panel and beam to efficiently support STxMP PUSCH transmission. Summary of the invention

[0005] Technical issues

[0006] According to the existing beam management method, the UE's beam measurement and reporting (e.g., CRI / SSBRI+L1-RSRP / SINR) process and the SRS beam change / indication process for codebook / non-codebook (applicable to UE's beam report) should be performed to support STxMP PUSCH transmission. In this case, the following problems may occur:

[0007] [1] There is signaling overhead / delay until the SRS beam is changed / indicated.

[0008] [2] If the SRS beams for codebook / non-codebook are configured to follow a unified TCI (e.g., UL TCI or joint TCI), all beams used for other UL channels / signals (e.g., PUSCH / PUCCH) (as well as DL channels / signals) need to be changed. Therefore, there is a possibility that the STxMP beam combination is a poor beam combination in terms of UL interference. This is because it is difficult for the base station to measure the UL interference for the corresponding STxMP panel / beam combination before receiving the SRS.

[0009] An object of the present disclosure is to provide a method for solving the above-mentioned problems.

[0010] The technical objectives of the present disclosure are not limited to the above technical objectives, and a person skilled in the art can clearly understand other technical objectives not mentioned above from the following description.

[0011] Technical Solution

[0012] According to an embodiment of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system includes: reporting channel state information (CSI), and sending a sounding reference signal (SRS).

[0013] The CSI includes at least one DL RS resource indicator.

[0014] The SRS is transmitted based on at least one SRS resource.

[0015] An uplink transmission (UL Tx) spatial filter associated with at least one SRS resource is determined based on at least one DLRS resource indicator.

[0016] At least one DL RS resource indicator may be associated with simultaneous transmission by the UE based on an uplink transmit (UL Tx) spatial filter.

[0017] A UL Tx spatial filter related configuration configured in at least one SRS resource may not be used.

[0018] Based on the fact that the UL Tx spatial filter related configuration is not configured in the at least one SRS resource, the UL Tx spatial filter may be determined based on the at least one DL RS resource indicator.

[0019] The method may also include receiving downlink control information (DCI) including an SRS request field.

[0020] At least one aperiodic SRS resource set may be triggered based on the SRS request field.

[0021] The at least one SRS resource may be based on at least one aperiodic SRS resource set.

[0022] The DCI may include a CSI request field.

[0023] The reporting of CSI may be triggered based on the CSI request field.

[0024] The DCI may include a 1-bit field. The 1-bit field may indicate whether to use at least one DL RS resource indicator to determine the UL Tx spatial filter.

[0025] The code point determination based on the SRS request field may determine the UL Tx spatial filter using at least one DL RS resource indicator.

[0026] The method may also include receiving a medium access control control element (MAC CE).

[0027] The semi-persistent SRS resource set may be activated based on the MAC CE.

[0028] The at least one SRS resource may be based on a semi-persistent SRS resource set.

[0029] The method may also include receiving configuration information related to the CSI.

[0030] The CSI-related configuration information may include information related to group-based beam reporting.

[0031] The CSI may include two DL RS resource indicators associated with each of the one or more groups.

[0032] The UL Tx spatial filter may include two UL Tx spatial filters determined based on two DL RS resource indicators associated with a first group among the one or more groups.

[0033] The two UL Tx spatial filters may include i) a first UL Tx spatial filter determined based on the first DL RS resource indicator, and ii) a second UL Tx spatial filter determined based on the second DL RS resource indicator.

[0034] The beam quality value associated with the first DL RS resource indicator may be greater than the beam quality value of the second DL RS resource indicator.

[0035] The at least one SRS resource may be one SRS resource associated with multiple antenna ports.

[0036] For at least one first antenna port among the plurality of antenna ports, the SRS may be transmitted based on a first UL Tx spatial filter.

[0037] For at least one second antenna port among the plurality of antenna ports, the SRS may be transmitted based on a second UL Tx spatial filter.

[0038] The at least one SRS resource may be a plurality of SRS resources.

[0039] For at least one first SRS resource among the plurality of SRS resources, the SRS may be transmitted based on a first UL Tx spatial filter.

[0040] For at least one second SRS resource among the plurality of SRS resources, the SRS may be transmitted based on a second UL Tx spatial filter.

[0041] The at least one first SRS resource may be based on a first SRS resource set among the plurality of SRS resource sets.

[0042] The at least one second SRS resource may be based on a second SRS resource set among the plurality of SRS resource sets.

[0043] The method may also include receiving configuration information related to the SRS.

[0044] The SRS-related configuration information may include information for a plurality of SRS resource sets.

[0045] The CSI-related configuration information may include a reporting amount related to the CSI.

[0046] The reporting amount can be set as: i) "cri"-"RSRP (Reference Signal Received Power)", ii) "ssb-Index"-"RSRP", iii) "cri"-"RSRP"-"Index" or iv) "ssb-Index"-"RSRP"-"Index".

[0047] cri may be a channel state information reference signal resource indicator (CSI-RS resource indicator, CRI), ssb-Index may be an SS / PBCH block resource indicator (SSB resource indicator, SSBRI), and Index may be an index of a UE capability value set. The maximum number of SRS antenna ports supported may be indicated based on the index of the UE capability value set.

[0048] The CSI may also include an index to a UE capability value set.

[0049] The at least one SRS resource may be based on at least one SRS resource set.

[0050] The usage of at least one SRS resource set may be set to codebook, non-codebook, antenna switching, or beam management.

[0051] The SRS may be an aperiodic SRS or a semi-persistent SRS.

[0052] According to another embodiment of the present disclosure, a user equipment (UE) operating in a wireless communication system includes one or more transceivers, one or more processors, and one or more memories, wherein the one or more memories are operably connected to the one or more processors and store instructions, which configure the one or more processors to perform operations based on being executed by the one or more processors.

[0053] These operations include reporting channel state information (CSI) and sending sounding reference signals (SRS).

[0054] The CSI includes at least one DL RS resource indicator.

[0055] The SRS is transmitted based on at least one SRS resource.

[0056] An uplink transmission (UL Tx) spatial filter associated with at least one SRS resource is determined based on at least one DLRS resource indicator.

[0057] An apparatus according to another embodiment of the present disclosure includes: one or more memories, and one or more processors operatively connected to the one or more memories.

[0058] The one or more memories include instructions that, upon execution by the one or more processors, configure the one or more processors to perform operations.

[0059] These operations include reporting channel state information (CSI) and sending sounding reference signals (SRS).

[0060] The CSI includes at least one DL RS resource indicator.

[0061] The SRS is transmitted based on at least one SRS resource.

[0062] An uplink transmission (UL Tx) spatial filter associated with at least one SRS resource is determined based on at least one DLRS resource indicator.

[0063] One or more non-transitory computer-readable media according to another embodiment of the present disclosure store one or more instructions.

[0064] The one or more instructions executable by the one or more processors configure the one or more processors to perform operations.

[0065] These operations include reporting channel state information (CSI) and sending sounding reference signals (SRS).

[0066] The CSI includes at least one DL RS resource indicator.

[0067] The SRS is transmitted based on at least one SRS resource.

[0068] An uplink transmission (UL Tx) spatial filter associated with at least one SRS resource is determined based on at least one DLRS resource indicator.

[0069] A method performed by a base station of a wireless communication system according to another embodiment of the present disclosure includes: receiving channel state information (CSI), and receiving a sounding reference signal (SRS).

[0070] The CSI includes at least one DL RS resource indicator.

[0071] The SRS is received based on at least one SRS resource.

[0072] An uplink transmission (UL Tx) spatial filter associated with at least one SRS resource is determined based on at least one DLRS resource indicator.

[0073] According to another embodiment of the present disclosure, a base station operating in a wireless communication system includes one or more transceivers, one or more processors, and one or more memories, which are operably connected to the one or more processors and store instructions, which configure the one or more processors to perform operations based on being executed by the one or more processors.

[0074] These operations include receiving channel state information (CSI), and receiving a sounding reference signal (SRS).

[0075] The CSI includes at least one DL RS resource indicator.

[0076] The SRS is received based on at least one SRS resource.

[0077] An uplink transmission (UL Tx) spatial filter associated with at least one SRS resource is determined based on at least one DLRS resource indicator.

[0078] Beneficial Effects

[0079] According to an embodiment of the present disclosure, an uplink transmission (UL Tx) spatial filter associated with an SRS resource is determined based on a resource indicator (CRI and / or SSBRI) reported via a CSI. Since no additional signaling is required to change the beam used for SRS transmission, the signaling overhead / delay required to determine the best UL beam can be reduced compared to existing methods.

[0080] According to an embodiment of the present disclosure, a resource indicator may be associated with simultaneous transmission by a UE based on a spatial filter. In other words, SRS transmission may be performed based on a spatial filter (e.g., corresponding to the above-mentioned STxMP beam combination) that may be applied to simultaneous transmission. The base station receives the SRS based on the STxMP beam combination, so that the UL interference for each beam combination associated with the simultaneous transmission may be measured. Therefore, if a unified TCI is updated based on SRS transmission, beam combinations (e.g., combinations of resource indicators) that cause greater interference to other UL channels / signals may be excluded.

[0081] Effects that can be obtained by the present disclosure are not limited to the above-described effects, and other technical effects not described above can be clearly understood by ordinary technicians in the field to which the present disclosure belongs according to the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Figure 1 An example of beamforming using SSB and CSI-RS is illustrated.

[0083] Figure 2 is a flow chart illustrating an example of a DL BM procedure using SSB.

[0084] Figure 3 A signaling process according to an embodiment of the present disclosure is illustrated.

[0085] Figure 4 is a flowchart illustrating a method performed by a user equipment according to an embodiment of the present disclosure.

[0086] Figure 5 is a flowchart illustrating a method performed by a base station according to another embodiment of the present disclosure.

[0087] Figure 6 The configurations of the first device and the second device according to the embodiment of the present disclosure are illustrated. DETAILED DESCRIPTION

[0088] The following will be attached Figure 1 The detailed description disclosed above will describe exemplary embodiments of the present disclosure, rather than describing unique embodiments for performing the present disclosure. The following detailed description includes details that provide a complete understanding of the present disclosure. However, those skilled in the art will appreciate that the present disclosure may be performed without these details.

[0089] In some cases, in order to prevent the concepts of the present disclosure from being obscure, known structures and devices may be omitted, or may be illustrated in a block diagram format based on the core functions of each structure and device.

[0090] In the following, downlink (DL) means communication from a base station to a terminal, and uplink (UL) means communication from a terminal to a base station. In the downlink, the transmitter may be part of a base station, and the receiver may be part of a terminal. In the uplink, the transmitter may be part of a terminal, and the receiver may be part of a base station. The base station may be represented as a first communication device, and the terminal may be represented as a second communication device. The base station (BS) may be replaced with terms including a fixed station, a node B, an evolved node B (eNB), a next generation node B (gNB), a base transceiver system (BTS), an access point (AP), a network (5G network), an AI system, a roadside unit (RSU), a vehicle, a robot, an unmanned aerial vehicle (UAV), an AR (augmented reality) device, a VR (virtual reality) device, and the like. In addition, the terminal may be fixed or mobile, and may be replaced by terms including 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 and device-to-device (D2D) device, vehicle, robot, AI module, unmanned aerial vehicle (UAV), AR (augmented reality) device, VR (virtual reality) device, etc.

[0091] Beam Management (BM)

[0092] The BM process, which is a Layer 1 (L1) / Layer 2 (L2) process for acquiring and maintaining a set of base station (e.g., gNB, TRP, etc.) and / or terminal (e.g., UE) beams that can be used for downlink (DL) and uplink (UL) transmission / reception, may include the following processes and terms.

[0093] - Beam measurement: The operation of measuring the characteristics of a beamforming signal received by an eNB or UE.

[0094] -Beam determination: The operation of selecting the transmit (Tx) beam / receive (Rx) beam of the eNB or UE by the eNB or UE.

[0095] - Beam scanning: The operation of covering a spatial area using transmit and / or receive beams for time intervals by a predetermined scheme.

[0096] -Beam reporting: An operation in which the UE reports information of beamformed signals based on beam measurements.

[0097] The BM process may be divided into (1) a DL BM process using a synchronization signal (SS) / physical broadcast channel (PBCH) block or a CSI-RS and (2) a UL BM process using a sounding reference signal (SRS).

[0098] In addition, each BM process may include Tx beam scanning for determining a Tx beam and Rx beam scanning for determining an Rx beam.

[0099] DL BM

[0100] The DL BM process may include (1) transmission of a beamforming DL reference signal (RS) (eg, CSI-RS or SS block (SSB)) by the eNB and (2) beam reporting by the UE.

[0101] Here, the beam report includes a preferred DL RS identifier (ID) and an L1 reference signal received power (RSRP) corresponding to the preferred DL RS identifier (ID).

[0102] The DL RS ID may be a SSB resource indicator (SSBRI) or a CSI-RS resource indicator (CRI).

[0103] Figure 1 An example of beamforming using SSB and CSI-RS is illustrated.

[0104] like Figure 1 As shown, SSB beams and CSI-RS beams can be used for beam management. The measurement metric is L1-RSRP for each resource / block. SSB can be used for coarse beam management, and CSI-RS can be used for fine beam management. SSB can be used for both Tx beam scanning and Rx beam scanning.

[0105] Rx beam scanning using SSB may be performed when the UE changes the Rx beam for the same SSBRI across multiple SSB bursts. Here, one SS burst includes one or more SSBs, and one SS burst set includes one or more SSB bursts.

[0106] Figure 2 is a flow chart illustrating an example of a DL BM procedure using SSB.

[0107] Configuration of beam reporting using SSB is performed during CSI / beam configuration in the RRC connected state (or RRC connected mode).

[0108] - The UE receives a CSI-ResourceConfig IE including a CSI-SSB-ResourceSetList including SSB resources for a BM from the eNB (S210).

[0109] Table 1 shows an example of the CSI-ResourceConfig IE. As shown in Table 1, a BM configuration using SSB is not separately defined, and SSB is configured similarly to a CSI-RS resource.

[0110] [Table 1]

[0111]

[0112]

[0113] In Table 1, the csi-SSB-ResourceSetList parameter represents a list of SSB resources in a resource set for beam management and reporting. Here, the SSB resource set can be configured as {SSBx1, SSBx2, SSBx3, SSBx4, ...}. For example, the SSB index can be defined as 0 to 63.

[0114] -The UE receives SSB resources from the eNB based on the CSI-SSB-ResourceSetList (S220).

[0115] - When CSI-reportConfig associated with reporting of SSBRI and L1-RSRP is configured, the UE (beam) reports the best SSBRI and L1-RSRP corresponding thereto to the eNB (S230).

[0116] In other words, when reportQuantity of CSI-reportConfig IE is configured as "ssb-Index-RSRP", the UE reports the best SSBRI and L1-RSRP corresponding thereto to the eNB.

[0117] In addition, when CSI-RS resources are configured in the same OFDM symbol as SSB (SS / PBCH block) and "QCL-Type D" is applicable, the UE can assume that the CSI-RS and SSB are quasi-co-located from the perspective of "QCL-Type D".

[0118] Here, QCL TypeD may mean that the antenna port is QCL from the perspective of spatial Rx parameters. When the UE receives multiple DL antenna ports with a QCL TypeD relationship, the same Rx beam may be applied. In addition, the UE does not expect the CSI-RS to be configured in REs that overlap with REs of SSB.

[0119] BM enhancement in NR Rel-16

[0120] The DL / UL beam indication standardized in 3GPP NRRel-15 has been designed to indicate the beam used for each DL / UL channel / RS resource separately to ensure beam indication flexibility, and the indication method has been designed separately for each channel / RS.

[0121] This design direction ultimately has the following problems: the base station must indicate the beam change for each channel / RS resource to multiple UEs communicating with the base station using a single beam in order to change the serving beam for multiple UEs, which results in large signaling overhead and large beam change delay. With the UL beam change, UL power control related parameters, especially path loss RS (PL RS), must be changed for each UL channel / RS, which also results in signaling overhead / delay problems. In order to compensate for these shortcomings, five features are introduced in Rel-16. The following Table 2 shows these five features.

[0122] [Table 2]

[0123]

[0124]

[0125] In Rel-16, in addition to the above-mentioned enhancements related to beam / PL RS indication, enhancements related to beam reporting are also made. In Rel-15, a mode in which the UE measures / reports L1-RSRP for each beam RS is supported. However, in an environment with high inter-beam interference, it is difficult to ensure that a specific beam RS has good quality as a serving beam simply because the L1-RSRP (i.e., the received strength of a specific beam RS) is high. In other words, the UE may select a beam with high received strength but high beam interference, and report the beam to the base station. In order to overcome this shortcoming, Rel-16 supports a new beam reporting mode in which the base station configures resources for interference measurement and RS for channel measurement, and the UE measures L1-SINR for channel resources and interference resources based on this, and reports several RSs with high L1-SINR values.

[0126] BM enhancement in NRRel-17

[0127] As mentioned above, various BM enhancements were made in Rel-16. Specifically, features were created that can significantly reduce the signaling overhead / latency associated with the beam indication method. However, there is still no configuration / indication channel / RS unified beam for UEs operating with a single serving beam.

[0128] Based on this motivation, Rel-17 will standardize the channel / RS unified beam configuration / indication method. In NR, the DL beam is indicated by sending a configuration indicator (TCI), so it is called a unified TCI state. The existing TCI state is configured / indicated separately for each DLRS / channel, but the unified TCI state is characterized by a unified configuration / indication. Basically, the DL unified TCI state indicates that the QCL type-DRS of (some) PDCCH, PDSCH and (some) CSI-RS resources are uniformly applied, and the UL unified TCI state indicates that the spatial relationship RS (and PL RS) of (some) PUCCH, PUSCH and (some) SRS are uniformly applied. For UEs that have established beam correspondence, since the UL spatial relationship and PLRS can also be matched with the DL beam RS in the same way as the Rel-16 default spatial relationship / PLRS feature, the channel / RS to which the unified TCI state is applied can cover both DL channels / RS and UL channels / RS. This is called a joint DL / UL TCI state. That is, the following two modes will be supported.

[0129] -Joint DL / UL TCI configuration / indication mode: The DL RS configured / indicated in the joint TCI state can be applied not only as a QCL type-D RS for the DL channel / RS, but also as a spatial relationship RS (and PLRS) for the UL channel / RS. That is, if an update to the joint TCI state is indicated, the beam RS (or / and PL RS) for the DL channel / RS and the UL channel / RS can be changed together.

[0130] -Separate DL and UL TCI configuration / indication mode: QCL type-D source RS for DL ​​channels / RS is unified and configured / indicated by DL TCI state, and spatial relationship RS (and PL RS) for UL channels / RS is unified and configured / indicated by UL TCI state. DL TCI state and UL TCI state are configured / indicated separately.

[0131] The DL / UL / joint TCI state will be indicated / updated via MAC-CE and / or DCI. More specifically, one or more TCI states (referred to as a TCI state pool) among the multiple TCI states configured by RRC are activated by MAC-CE. If multiple TCI states are activated by MAC-CE, one of the multiple TCI states is indicated by DCI.

[0132] DCI indication will be supported via downlink DCI formats (DCI1-1 / 1-2) that support the TCI field, and will be supported in both cases with and without PDSCH scheduling. In the latter case, since PDSCH scheduling is omitted (similar to the DCI-based semi-persistent scheduling (SPS) release method), UE ACK transmission for the corresponding DCI will be supported.

[0133] Enhancements related to beam reporting will be made in Rel-17. The Rel-17 beam reporting mode will support a mode in which the UE measures / reports the best beam RS for each TRP, targeting a multi-TRP environment. To this end, if the beam measurement RS set / group is divided into two subsets / subgroups and the base station configures them, the UE will select RS for each subset / subgroup and report them together with the quality value of the corresponding RS (L1-RSRP, [L1-SINR]).

[0134] In the present disclosure, " / " means "and", "or" or "and / or" depending on the context.

[0135] In the present disclosure, QCL type-D RS or TCI state (or simply TCI) may mean a spatial parameter, i.e., a QCL reference RS from a beam perspective. The QCL reference RS may be extended and interpreted as a reference RS or source RS for a corresponding parameter or other beam / spatial related parameters.

[0136] In the present disclosure, "beam" may mean a spatial filter determined based on a reference RS or a source RS. The spatial filter may include a spatial domain filter, a spatial domain transmission filter, and a spatial domain reception filter.

[0137] For example, a beam associated with the UL may be referred to as i) a spatial filter (for uplink transmission or for uplink reception), ii) a spatial domain filter (for uplink transmission or for uplink reception), iii) an uplink spatial domain transmit filter, iv) an uplink spatial domain receive filter, v) an uplink transmit spatial filter (UL Tx spatial filter) or vi) an uplink receive spatial filter (UL Rx spatial filter).

[0138] For example, a DL-related beam may be referred to as i) a spatial filter (for downlink transmission or for downlink reception), ii) a spatial domain filter (for downlink transmission or for downlink reception), iii) a downlink spatial domain transmit filter, iv) a downlink spatial domain receive filter, v) a downlink transmit spatial filter (DL Tx spatial filter) or vi) a downlink receive spatial filter (DL Rx spatial filter).

[0139] For example, when beam reciprocity is established, the DL beam and the UL beam may be equivalently referred to as a spatial filter or a spatial domain filter. Specifically, when beam reciprocity is established, a specific UL beam may be the same as a specific DL beam. For example, the UL beam to be used for uplink transmission of the UE may be determined based on the measurement of the DL beam used for the transmission of the base station. For example, the DL beam to be used for downlink transmission of the base station may be determined based on the measurement of the UL beam used for the transmission of the UE.

[0140] In environments such as low frequency bands where analog beamforming is not used, the indication of the QCL type-D RS may be omitted. In this case, the QCL type-D RS in the present disclosure may be interpreted as a QCL reference RS (i.e., when there is only one reference RS in the TCI state, it may refer to the corresponding RS).

[0141] From the UL perspective, the TCI state (or simply TCI) may refer to a state including a reference / source RS for a UL beam. From the UL perspective, the TCI state may indicate a spatial relationship RS (and path loss RS) in the existing Rel-15 / 16. Here, the path loss RS may be configured to be the same as the corresponding RS, or configured to be associated with the UL TCI state, or configured to be included separately.

[0142] Codebook (CB) or non-codebook (NCB) SRS transmission for each panel and beam is required to efficiently support STxMP PUSCH transmission. In other words, SRS transmission based on SRS resource sets (where the usage is set to codebook or non-codebook) is required to support STxMP PUSCH transmission.

[0143] The reasons for the above-mentioned SRS transmission are as follows. When the base station pre-receives an SRS suitable for a panel and beam for STxMP PUSCH transmission, configuration for the corresponding PUSCH can be performed. The base station can send information including the configuration for the corresponding PUSCH to the UE. For example, the configuration of the corresponding PUSCH may include parameter / configuration information determined by the base station receiving the SRS. For example, the configuration of the corresponding PUSCH may include transmission rank information and precoder (TPMI, SRI) information for each panel and / or all panels.

[0144] According to the existing beam management method, the following processes 1) and 2) are required for the configuration of the above-mentioned PUSCH.

[0145] 1. UE beam measurement and reporting (e.g., CRI / SSBRI+L1-RSRP / SINR) process

[0146] 2. SRS beam change / indication procedure for codebook / non-codebook (applicable to UE beam reporting)

[0147] According to the processes of 1) and 2), the following problems [1] and [2] may occur.

[0148] [1] There is signaling overhead / delay until the SRS beam is changed / indicated.

[0149] [2] When the beam changes based on the Rel-18 unified TCI, the SRS beams for codebook / non-codebook may be configured to follow the unified TCI (e.g., UL TCI or joint TCI). In this case, all beams used for other UL channels / signals (e.g., PUSCH / PUCCH) (as well as DL channels / signals) should change due to the SRS beam change. However, there is the possibility that the STxMP beam combination (based on the UE beam report) is a bad beam combination in terms of UL interference. This is because it is difficult for the base station to measure the UL interference for the corresponding STxMP panel / beam combination before receiving the SRS.

[0150] An implementation scheme for solving / mitigating the above-mentioned problems (eg, overhead, latency, unified TCI-related issues) is described below.

[0151] Method 1

[0152] The UE determines / applies the beam of the SRS resource based on the reported beam RS information. In other words, the uplink transmit spatial filter (UL Tx spatial filter) associated with the SRS resource can be determined based on the beam information (CRI / SSBRI) reported via CSI.

[0153] The SRS resources may include: i) aperiodic SRS resources triggered based on a UL DCI triggering a beam report, and / or ii) aperiodic / semi-persistent SRS resources triggered by the base station after a beam report.

[0154] For example, non-periodic / semi-persistent beam reporting for / related to UL and / or STxMP may be triggered based on UL DCI. That is, CSI including resource indicators related to uplink and / or simultaneous transmission across multiple panels (STxMP) may be reported based on UL DCI.

[0155] For example, after the beam report, non-periodic SRS resources / semi-persistent SRS resources can be triggered / activated through DCI / MAC CE.

[0156] According to an embodiment, the beam report for UL may be a beam report for UE capability (set) index introduced in Rel-17 MIMO (e.g., corresponding to "Capability [Set] Index" in TS38.214 V17.1.0). This is because the beam report has the feature that the UE selects / reports the CRI / SSBRI applicable to UL transmission. The beam report for UE capability (set) index is described in detail below.

[0157] In Rel-17 MIMO, the beam reporting method supported in the existing release has evolved, and therefore a reporting enhancement method has been standardized to support the UE's uplink (UL) (and downlink (DL)) panel selection by reporting the UE capability (set) index corresponding to the UE panel or panel type together and utilizing the index. The UE capability (set) index may represent the maximum number of SRS antenna ports supported (e.g., 1, 2, or 4). The UE capability (set) index may be defined for panels with different numbers of SRS ports. The UE capability (set) index may be referred to as an index of a set of UE capability values. With respect to the reported amount of CSI, the UE capability (set) index may be referred to as "Capability [Set] Index" or "Index".

[0158] For example, assume that a 4-panel UE includes panel #0 (2 ports), panel #1 (2 ports), panel #2 (4 ports), and panel #3 (4 ports). In this case, panel #0 and panel #1 can be mapped to Capability [Set] Index #0, and panel #2 and panel #3 can be mapped to Capability [Set] Index #1.

[0159] The CRI and / or SSBRI reported with Capability[Set]Index#0 may be associated with panels (panel #0 and panel #1) having a maximum number of supported SRS ports of 2. For example, the best panel for the reported CRI and / or SSBRI may be panel #0 and / or panel #1. For example, transmission (and / or reception) based on a beam associated with the second parameter (CRI, SSBRI) reported with Capability[Set]Index#0 may be performed based on panel #0 and / or panel #1.

[0160] The parameters (CRI, SSBRI) reported with Capability[Set]Index#1 may be related to panels (panel #2 and panel #3) that support a maximum number of SRS ports of 4. For example, the best panel for the reported CRI and / or SSBRI may be panel #2 and / or panel #3. For example, transmission (and / or reception) based on beams related to the parameters (CRI, SSBRI) reported with Capability[Set]Index#1 may be performed based on panel #2 and / or panel #3.

[0161] Based on the above beam report, the base station can change / indicate the best DL beam (e.g., DL TCI state) and / or the best UL beam (e.g., UL TCI state, spatial relationship RS).

[0162] For example, beam reporting for UE capability (set) index may be performed based on Table 3 below.

[0163] [Table 3]

[0164]

[0165]

[0166] Additionally or alternatively, beam reporting for STxMP may be introduced in Rel-18 or later. For example, information about multiple CRIs / SSBRIs capable of STxMP may be reported to the base station.

[0167] Method 1 is a method in which the UE configures / determines / applies the CB / NCB SRS beam based on the above-mentioned UL (STxMP) beam report. For this operation, the beam RS information of the pre-configured / pre-indicated CB / NCB SRS (for example, the reference RS based on the TCI state or spatial relationship information configured in the SRS resource) can be ignored.

[0168] Alternatively, the beam RS may not be configured in the CB / NCB SRS resources that perform the corresponding operation.

[0169] The operation of the proposed method may be performed under specific conditions (eg, beam RS is not configured in CB / NCB SRS) or through configuration / instruction of the base station.

[0170] The configuration / indication of the base station may be performed through messages such as RRC / MAC-CE / DCI. For example, a (1-bit) indicator may be added to the DCI that triggers the SRS. The indicator may indicate i) whether the SRS is to be transmitted based on the beam configured / determined by the above method 1, or ii) whether the SRS is to be transmitted based on a pre-configured / pre-indicated beam.

[0171] For example, information on whether the above operation (operation based on method 1) is followed may be added to the SRS triggering state. Specifically, a code point representing the SRS triggering state based on the operation of method 1 may be defined / configured. The code point of the SRS triggering state may be based on the code point of the SRS request field.

[0172] For example, whether to apply the above operation (whether to apply the operation according to method 1) can be indicated by a specific reserved code point not used in the DCI or a specific combination of DCI fields.

[0173] According to an embodiment, among a plurality of CRIs or SSBRIs reported by the UE, N (eg, N=2) beams corresponding to the highest beam quality (eg, L1-RSRP, L1-SINR) may be applied to SRS transmission.

[0174] According to an embodiment, among a plurality of CRIs or SSBRIs reported by a UE, N beams (eg, first N beams) selected in the order in which they are reported may be applied to SRS transmission.

[0175] According to an embodiment, the operation according to method 1 may be performed based on the MTRP group-based beam reporting method introduced in Rel-17. Specifically, the (two) beam RSs corresponding to the best quality or included in the first beam group may be configured / determined / applied as CB / NCB SRS beams. In this case, group-based beam reporting may be performed based on the following Table 4. Here, the quality of the beam group may include the sum / combination of each beam quality value, or may be defined / reported as a separate quality value.

[0176] [Table 4]

[0177]

[0178] The above operation may be applied to a single SRS resource or multiple SRS resources.

[0179] According to an embodiment, the following operations may be performed for multiple antenna ports constituting a single CB SRS resource. Some ports may be transmitted based on beam RS#1 (e.g., CRI1 or SSBRI1), and the remaining ports may be transmitted based on beam RS#2 (e.g., CRI2 or SSBRI2). Here, beam RS#1 and beam RS#2 may correspond to beams capable of STxMP. In other words, resources (CSI-RS resources and / or SSB resources) based on beam RS#1 and beam RS#2 may be applied to simultaneous transmissions by the UE based on a spatial filter.

[0180] According to an embodiment, some of the multiple CB / NCB SRS resources may be transmitted based on beam RS#1, and the remaining resources may be transmitted based on beam RS#2. Here, the resources to which each beam RS is applied may constitute different SRS resource sets.

[0181] According to an embodiment, the same CB / NCB SRS resource / port may be transmitted by applying both beam RS#1 and beam RS#2 (eg, UL SFN transmission or UL (coherent) joint transmission).

[0182] In an operation according to an embodiment (eg, in an operation in which ports or SRS resources are divided and applied to RS#1 and RS#2, respectively), the following embodiments may be applied.

[0183] Which beam RSs should be applied to which SRS ports / resources can be configured / indicated by the base station or defined by some rules. For example, the base station can configure multiple CB / NCB SRS resource sets for STxMP and / or MTRP UL transmission to the UE. In this case, the following rules can be configured / defined. The first SRS resource set can apply the first RS (or RS with the best quality) among the CRI / SSBRI (belonging to a specific beam RS group), and the second SRS resource set can apply the second RS (for example, RS with sub-optimal quality, RS corresponding to / in a paired relationship with the first RS / belonging to the same beam group) among the CRI / SSBRI (belonging to a specific beam RS group).

[0184] The above example assumes STxMP and applies two beams. However, there may be a situation where the UE does not find a beam combination that can perform STxMP or does not prefer STxMP transmission (for example, to reduce battery consumption, STxMP transmission is not preferred). In this case, two RSs (for example, RS#1 and RS#2 in the above example) can correspond to the same beam RS.

[0185] In the above-mentioned embodiment, there may be a situation where the base station does not receive the reported CRI / SSBRI normally. Alternatively, even if the base station receives normally, it may take time to configure / apply the receive beam for the subsequent SRS to the corresponding beam. Therefore, a time offset value (e.g., X symbols, Y time slots, Z milliseconds) from the beam reporting time to the time when the SRS beam starts to be configured / applied to the corresponding beam can be configured / specified. In this case, even if the UE receives a DCI that triggers the SRS within the corresponding offset value, it can apply the beam that has been pre-configured / pre-indicated / pre-maintained instead of the reported CRI / SSBRI.

[0186] In the present disclosure, a "panel" may correspond to a "TRP" that receives a corresponding signal, and may correspond to a "beam RS (set)", a "CORESET pool", a "PUCCH / SRS resource group", etc.

[0187] The above embodiments are mainly described based on the premise that they are used in CB / NCB SRS. This is only for the convenience of explanation and is not intended to limit the technical scope of the present disclosure to the specific use of SRS. For example, the above embodiments can be applied to SRS configured with other uses other than codebook / non-codebook (e.g., antenna switching, beam management).

[0188] From an implementation perspective, this can be achieved through the following Figure 6 The apparatus (eg, 100 and 200) is used to process the operations of the base station / UE according to the above-mentioned embodiments (eg, operations based on method 1).

[0189] The operation of the base station / UE according to the above embodiment (eg, the operation based on method 1) may be stored in a memory (eg, Figure 6 140 and 240) to run at least one processor (e.g., Figure 6 processors 110 and 210).

[0190] Refer to the following Figure 3 The signaling process based on the above implementation is described in detail.

[0191] Figure 3 A signaling process according to an embodiment of the present disclosure is illustrated.

[0192] More specifically, Figure 3 An example of signaling between a user equipment (UE) and a base station (BS) based on the above-mentioned proposed methods (eg, method 1, method 2, method 3) is illustrated. UE / BS is merely an example and may be applied by being replaced with various devices. Figure 3 It is only for the convenience of description and does not limit the scope of the present disclosure. In addition, depending on the situation and / or setting, etc., it may be omitted. Figure 3 Some steps are illustrated in .

[0193] Figure 3The UE and / or BS in may support multiple panels / TRPs. A TRP / panel may be a unit including one or more antennas, antenna ports, beams, and uplink / downlink RS / channel resources of a UE. For example, an uplink transmission panel may be identified based on a source RS for an uplink channel / RS (e.g., UL TCI, spatial relationship), and a downlink transmission TRP may be identified based on a source RS for a downlink channel / RS (e.g., DL TCI, QCL RS). Specifically, a unit having a specific UL / DL resource set / group (ID) or a specific (panel-related) ID as a source RS may be identified.

[0194] In S305, the UE may report UE capability information to the BS. The UE capability information may include SRS transmission related information (e.g., maximum number of SRS resources / ports / resource sets) and STxMP related information (e.g., whether simultaneous transmission across multiple beams / resources / channels / signals is supported).

[0195] In S310, the UE may receive SRS transmission related configuration and beam and / or panel report related configuration from the BS. The beam / panel report related configuration may include information about the number of CRI / SSBRIs to be reported, the measurement value to be reported (e.g., whether to report L1-RSRP or L1-SINR), report type information (e.g., whether it is a non-periodic report, a semi-persistent report on PUSCH, a semi-persistent report on PUCCH, or a periodic report), information related to report periodicity and timing (e.g., periodicity, time slot offset, etc.), and an indicator for reporting panel (type) related information (e.g., Capability [Set] Index in TS38.214 V17.1.0). The SRS transmission related configuration may include SRS usage information, transmission periodicity, time slot offset, resource information, resource set information, etc.

[0196] After the beam / panel report related configuration in S310, in S315, the base station can perform a separate report trigger / activation indication (for semi-persistent or aperiodic reporting) on ​​the UE.

[0197] In S320, the UE that receives the beam / panel report related configuration in S310 (and the related trigger / activation message in S315) can perform beam / panel related reporting periodically / aperiodically based on the configuration (and trigger / activation indication).

[0198] In S325, the base station may trigger (aperiodic / semi-persistent) SRS based on the beam / panel reporting information of the UE. The trigger message may include an indication on whether the beam used for beam / panel reporting is applied to SRS, as proposed in the present disclosure.

[0199] In S330, the UE that receives the trigger message sends an SRS. When sending the SRS, the technology proposed in the present disclosure (eg, method 1) may be applied. For example, an SRS transmission beam may be configured and sent based on the beam / panel report information in S325.

[0200] Figure 3 The process in which the base station triggers the SRS after the beam / panel report in S325 and the UE sends the SRS based on this in S330 is illustrated by way of example. However, as described in the present disclosure, the SRS triggering step S325 can be performed together with / simultaneously with the report triggering step S315, or after the report triggering step S315 and before the beam / panel report step S320 of the UE. In addition, the SRS transmission step S330 can be performed together with the beam / panel report step S320 of the UE, or before the beam / panel report step S320 of the UE.

[0201] As described above, the above BS / UE signaling and operations may be performed by the apparatus described below (e.g., Figure 6 For example, the BS (eg, TRP 1 / TRP 2) may correspond to the first wireless device 100, and the UE may correspond to the second wireless device 200. In some cases, the opposite case may also be considered.

[0202] For example, the above BS / UE signaling and operations can be performed by Figure 6 The BS / UE signaling and operations described above may be stored in a memory (eg, a processor) in the form of commands / programs (eg, instructions, executable codes). Figure 6 140 and 240) to run Figure 6 at least one processor (e.g., 110 and 210).

[0203] Below, refer to Figure 4 and Figure 5 , the above implementation is described in detail from the operation perspective of UE and base station. The methods described below are distinguished only for the convenience of explanation. Therefore, as long as the methods are not mutually exclusive, it is obvious that part of the configuration of any method can be replaced by or combined with part of the configuration of another method.

[0204] Figure 4 is a flowchart illustrating a method performed by a user equipment according to an embodiment of the present disclosure.

[0205] Reference Figure 4According to an embodiment of the present disclosure, the method performed by a user equipment (UE) in a wireless communication system includes a CSI reporting step S410 and an SRS transmission step S420.

[0206] In step 410, the UE reports channel state information (CSI) to the base station.

[0207] CSI may be reported periodically, semi-persistently, or aperiodically.

[0208] The CSI may be sent on the Physical Uplink Control Channel (PUCCH) or the Physical Uplink Shared Channel (PUSCH).

[0209] Periodic CSI reporting is performed on short PUCCH and long PUCCH. Semi-persistent (SP) CSI reporting is performed on short PUCCH, long PUCCH or PUSCH. Aperiodic CSI reporting is performed on PUSCH and triggered by DCI. In this case, information related to aperiodic CSI reporting triggering can be sent / indicated / configured via MAC-CE.

[0210] The CSI may include information related to beam reporting (resource indicator (at least one of CRI / SSBRI, RSRP and / or SINR)). This embodiment may be based on method 1.

[0211] For example, the CSI may include at least one DL RS resource indicator. The at least one DL RS resource indicator may include i) at least one channel state information reference signal resource indicator (CSI-RS resource indicator, CRI), and / or ii) at least one SSB resource indicator (SS / PBCH block (SSB) resource indicator (SSBRI)).

[0212] At least one DL RS resource indicator (e.g., CRI / SSBRI) based on the CSI report may be a resource indicator supporting simultaneous transmission across multiple panels (STxMP). For example, the at least one DL RS resource indicator (e.g., two CRIs or two SSBRIs) may be related to simultaneous transmission by the UE based on an uplink transmit spatial filter (UL Tx spatial filter) (or spatial filter). Specifically, resources (e.g., CSI-RS resources, SSB) based on the at least one DL RS resource indicator (e.g., two CRIs or two SSBRIs) may be applied to simultaneous transmission by the UE based on a spatial filter.

[0213] The method may further include a step of receiving configuration information related to CSI. In this step, the UE may receive configuration information related to channel state information (CSI) from the base station. The configuration information related to CSI may include information based on the above method 1. The step of receiving configuration information related to CSI may be performed before step S410.

[0214] The CSI-related configuration information may include at least one of the following items: i) CSI interference management (IM) resource related information, ii) CSI measurement configuration related information, iii) CSI resource configuration related information, iv) CSI-RS resource related information, or v) CSI report configuration related information. For example, at least one of i) to v) may include information based on the above method 1.

[0215] For example, the CSI-related configuration information may be based on CSI report configuration-related information (eg, CSI-ReportConfig IE). The CSI report configuration-related information may include information related to group-based beam reporting.

[0216] According to an embodiment, the CSI-related configuration information may include information related to group-based beam reporting (e.g., parameter groupBasedBeamReporting).

[0217] According to an embodiment, the configuration information related to the CSI may include a reporting amount related to the CSI.

[0218] For example, the reporting quantity can be set to 1) "cri"-"RI"-"PMI"-"CQI", 2) "cri"-"RI"-"i1", 3) "cri"-"RI"-"i1"-"CQI", 4) "cri"-"RI"-"CQI", 5) "cri"-"RSRP", 6) "ssb-Index"-"RSRP", 7) "cri"-"RI"-"LI"-"PMI"-"CQI", 8) "cri"-"SINR", 9) "ssb-Index"-"SINR", 10) "cri"-"RSRP"-"Index", 11) "ssb-Index"-"RSRP"-"Index", 12) "cri"-"SINR"-"Index" or 13) "ssb-Index"-"SINR"-"Index".

[0219] Based on the "reporting quantity", the CSI may include at least one of the following items: 1) channel quality indicator (CQI), 2) precoding matrix indicator (PMI), 3) CSI-RS resource indicator (CRI), 4) SSB resource block indicator (SSBRI), 5) layer indicator (LI), 6) rank indicator (RI), 7) layer 1-reference signal received strength (L1-RSRP), 8) layer 1-signal to interference and noise ratio (L1-SINR), and / or 9) CapabilityIndex or Index (index of a set of UE capability values).

[0220] The CSI may include one or more parameters based on each of 1) to 9). For example, the CSI may include one or more CRIs based on 3). For example, the CSI may include one or more CRIs based on 3), 4), and 9), one or more SSBRIs, and one or more indexes.

[0221] In this instance, the reporting amount can be configured so that parameters related to group-based beam reporting are reported. Specifically, the reporting amount can be set to: i) "cri"-"RSRP (reference signal received power)", ii) "ssb-Index"-"RSRP", iii) "cri"-"RSRP"-"Index" or iv) "ssb-Index"-"RSRP"-"Index". "cri" is the channel state information reference signal resource indicator (CSI-RS resource indicator, CRI). "ssb-Index" is the SS / PBCH block resource indicator (SSB resource indicator, SSBRI). "Index" is the index of the UE capability value set. The maximum number of SRS antenna ports supported can be indicated based on the index of the UE capability value set.

[0222] According to an embodiment, the CSI may include two DL RS resource indicators (eg, two CRIs or two SSBRIs) associated with each of the one or more groups.

[0223] In step 420, the UE sends a sounding reference signal (SRS) to the base station. The SRS may be sent based on at least one SRS resource. The SRS may be an aperiodic SRS or a semi-persistent SRS. The at least one SRS resource may be based on an aperiodic SRS resource set or a semi-persistent SRS resource set.

[0224] According to an embodiment, the at least one SRS resource may be based on at least one SRS resource set. The purpose of the at least one SRS resource set may be set to codebook, non-codebook, antenna switching or beam management.

[0225] According to an embodiment, the SRS may be sent based on the reported beam information. Specifically, a UL Tx spatial filter associated with at least one SRS resource may be determined based on at least one DL RS resource indicator (e.g., at least one CRI or at least one SSBRI). A reference RS for determining the UL Tx spatial filter may be based on the at least one DL RS resource indicator. This embodiment may be based on method 1.

[0226] The reference RS can be determined based on the beam information (TCI-state / spatialRelationInfo) configured in each SRS resource. In this instance, i) if the beam used to send the SRS (e.g., spatial filter / ULTx spatial filter) is determined based on the reported beam (RS) information, the beam information configured in the SRS resource (e.g., ULTx spatial filter related configuration (TCI state / spatialRelationInfo)) may not be used and may be ignored. Or ii) the corresponding operation (SRS beam determination operation) may be performed based on the fact that the beam information is not configured in the SRS resource. The following describes implementations related to the operations i) and ii).

[0227] According to an embodiment, the UL Tx spatial filter related configuration (e.g., transmission configuration indication (TCI) state or spatial relationship configuration) configured in at least one SRS resource may not be used (or the UE may ignore it). The TCI state may be the above-mentioned UL TCI state or the joint TCI state. The spatial relationship configuration (e.g., the high-level parameter spatialRelationInfo) may be related to the spatial relationship configuration between the target SRS (i.e., SRS) and the reference RS. That is, the UL Tx spatial filter may be determined based on at least one DL RS resource indicator (e.g., at least one CRI or at least one SSBRI) reported by the UE, regardless of the beam information (i.e., UL Tx spatial filter related configuration (TCI state / spatialRelationInfo)) configured in at least one SRS resource.

[0228] According to an embodiment, based on the fact that a UL Tx spatial filter related configuration (eg, a transmission configuration indication (TCI) state or a spatial relation configuration) is not configured in at least one SRS resource, a UL Tx spatial filter may be determined based on at least one DL RS resource indicator.

[0229] As described above, the CSI may include parameters based on group-based beam reporting (e.g., two DL RS resource indicators associated with each of one or more groups). In this case, the UL Tx spatial filter may be determined based on the resource indicator of the group-based beam report. The following describes in detail an embodiment related to the UL Tx spatial filter determination.

[0230] According to an embodiment, the UL Tx spatial filter may include two UL Tx spatial filters determined based on two DL RS resource indicators (e.g., two CRIs or two SSBRIs) associated with a first group in one or more groups. That is, the UL Tx spatial filter may be determined based on the resource indicator of the group with the best beam quality (the DL RS resource indicator of the first group in one or more groups).

[0231] According to an embodiment, the two UL Tx spatial filters may include i) a first UL Tx spatial filter determined based on a first DL RS resource indicator (e.g., a first CRI or a first SSBRI), and ii) a second UL Tx spatial filter determined based on a second DL RS resource indicator (e.g., a second CRI or a second SSBRI). The beam quality value associated with the first DL RS resource indicator (e.g., a first RSRP and / or a first SINR) may be greater than the beam quality value associated with the second DL RS resource indicator (e.g., a second RSRP and / or a second SINR).

[0232] Two UL Tx spatial filters can be applied per SRS antenna port or SRS resource. This is described in detail below.

[0233] According to an embodiment, the at least one SRS resource may be one SRS resource associated with multiple antenna ports.

[0234] For at least one first antenna port among the plurality of antenna ports, the SRS may be transmitted based on a first UL Tx spatial filter.

[0235] For at least one second antenna port among the plurality of antenna ports, the SRS may be transmitted based on a second UL Tx spatial filter.

[0236] That is, the SRS associated with the first SRS antenna port (the second SRS antenna port) may be transmitted based on the first ULTx spatial filter (the second ULTx spatial filter).

[0237] According to an embodiment, the at least one SRS resource may be a plurality of SRS resources.

[0238] For at least one first SRS resource among the plurality of SRS resources, the SRS may be transmitted based on a first UL Tx spatial filter.

[0239] For at least one second SRS resource among the plurality of SRS resources, the SRS may be transmitted based on a second UL Tx spatial filter.

[0240] That is, in at least one first SRS resource (second SRS resource), the SRS may be transmitted based on the first ULTx spatial filter (second ULTx spatial filter).

[0241] The first / second SRS resources may be based on different SRS resource sets. According to an embodiment, the at least one first SRS resource may be based on a first SRS resource set in a plurality of SRS resource sets. The at least one second SRS resource may be based on a second SRS resource set in a plurality of SRS resource sets.

[0242] The method may also include a step of receiving configuration information related to SRS. In the step of receiving configuration information related to SRS, the UE receives configuration information related to SRS from the base station. The configuration information related to SRS may include information based on method 1 (e.g., SRS antenna port, SRS resource set, configuration related to the application of SRS beam (UL Tx spatial filter) determined based on the reported beam RS). The step of receiving configuration information related to SRS may be performed before step S410 or step S420.

[0243] For example, the configuration information related to SRS may be based on the SRS-Config IE in Table 5 below.

[0244] [Table 5]

[0245]

[0246]

[0247]

[0248]

[0249]

[0250] Referring to Table 5 above, one or more sounding reference symbol (SRS) resource sets may be configured by (high-level parameter) SRS-ResourceSet (via high-level signaling, RRC signaling, etc.). For each SRS resource set, K ≥ 1 SRS resources (high-level parameter SRS-resource) may be configured to the UE. Here, K is a natural number, and the maximum value of K may be indicated by SRS_capability.

[0251] The SRS-Config IE includes a list of SRS-Resources and a list of SRS-ResourceSets. Each SRS resource set represents a group of SRS resources. "spatialRelationInfo" is a parameter indicating the configuration of the spatial relationship between the reference RS and the target SRS.

[0252] Here, the reference RS may be SSB, CSI-RS, or SRS corresponding to the L1 parameter "SRS-SpatialRelationInfo." "SRS-SpatialRelationInfo" is configured for each SRS resource and indicates whether the same beam as that used in SSB, CSI-RS, or SRS is applied for each SRS resource.

[0253] According to an embodiment, the SRS-related configuration information may include information for multiple SRS resource sets (a first SRS resource set and a second SRS resource set).

[0254] The method may further include a step of receiving DCI. In the step of receiving DCI, the UE receives downlink control information (DCI) including an SRS request field from the base station. The step of receiving DCI may be performed before step S410 or step S420.

[0255] According to an embodiment, at least one aperiodic SRS resource set may be triggered based on the SRS request field. The at least one SRS resource may be based on the at least one aperiodic SRS resource set.

[0256] According to an embodiment, the DCI may be a DCI (eg, UL DCI) that triggers a beam report. Specifically, the DCI may include a CSI request field. The CSI report may be triggered based on the CSI request field.

[0257] According to an embodiment, whether to perform an operation of determining / transmitting an SRS beam based on reported beam information may be determined / indicated by a 1-bit indicator or an SRS triggering status.

[0258] For example, the DCI may include a 1-bit field. The 1-bit field may indicate whether to use the at least one DLRS resource indicator to determine the UL Tx spatial filter.

[0259] For example, whether to use the at least one DL RS resource indicator to determine the UL Tx spatial filter may be determined based on the code point of the SRS request field.

[0260] The method may further include the step of receiving a MAC CE. In the step of receiving a MAC CE, the UE receives a medium access control element (MAC CE) from the base station. The step of receiving a MAC CE may be performed before step S420.

[0261] According to an embodiment, a semi-persistent (SP) SRS resource set may be activated based on a MAC CE (e.g., an SP SRS activation / deactivation MAC CE). The at least one SRS resource may be based on a semi-persistent SRS resource set. For example, the SP SRS activation / deactivation MAC CE may include an SP SRS resource set ID. The SP SRS resource set ID may indicate an activated (deactivated) SP SRS resource set.

[0262] The method may further include a step of receiving a DL RS. Specifically, in the step of receiving a DL RS, the UE receives at least one downlink reference signal (DL RS) from a base station. The step of receiving a DL RS may be performed before step S410.

[0263] The at least one DL RS may be based on a synchronization signal / physical broadcast channel block (SS / PBCH block) (SSB) and / or a channel state information reference signal (CSI-RS).

[0264] For example, the at least one DL RS may include a CSI-RS and / or SSB based on two CSI resource sets.

[0265] The UE may calculate the CSI (or a parameter included in the CSI) based on the measurement of the at least one DL RS. The parameter included in the CSI may be determined / calculated based on the measurement of the at least one DL RS. The parameter included in the CSI may be a parameter based on a "report quantity".

[0266] The operations based on steps S410 and S420, the step of receiving configuration information related to CSI, the step of receiving configuration information related to SRS, the step of receiving DCI, the step of receiving MAC CE, and the step of receiving DL RS can be performed by Figure 6 For example, the UE 200 may control one or more transceivers 230 and / or one or more memories 240 to perform operations based on steps S410 and S420, a step of receiving configuration information related to CSI, a step of receiving configuration information related to SRS, a step of receiving DCI, a step of receiving MAC CE, and a step of receiving DL RS.

[0267] The above implementation is described in detail below from the perspective of base station operation.

[0268] The following operations based on steps S510 and S520, the step of sending configuration information related to CSI, the step of sending configuration information related to SRS, the step of sending DCI, the step of sending MAC CE, and the step of sending DL RS correspond to the reference Figure 4 The steps S410 and S420 described above, the step of receiving the configuration information related to the CSI, the step of receiving the configuration information related to the SRS, the step of receiving the DCI, the step of receiving the MAC CE, and the step of receiving the DL RS. In view of the above correspondence, redundant descriptions are omitted. That is, the detailed description of the base station operation described below can be replaced by the corresponding description of the base station operation. Figure 4 Description / implementation of.

[0269] For example, Figure 4 The description / implementation of steps S410 and S420 in the above-described embodiment may be additionally applied to the base station operations of steps S510 and S520 described below. For example, the description / implementation of the steps of receiving configuration information related to CSI, receiving configuration information related to SRS, receiving DCI, receiving MAC CE, and receiving DL RS may be additionally applied to the base station operations based on the steps of sending configuration information related to CSI, sending configuration information related to SRS, sending DCI, sending MAC CE, and sending DL RS described below.

[0270] Figure 5 is a flowchart illustrating a method executed by a base station according to another embodiment of the present disclosure.

[0271] Reference Figure 5 According to another embodiment of the present disclosure, a method performed by a base station in a wireless communication system includes a CSI receiving step S510 and an SRS receiving step S520.

[0272] In step 510, the base station receives channel state information (CSI) from the UE.

[0273] The method may further include the step of sending configuration information related to CSI. In this step, the base station may send configuration information related to channel state information (CSI) to the UE. The configuration information related to CSI may include information based on the above method 1. The step of sending configuration information related to CSI may be performed before step S510.

[0274] In step 520, the base station receives a sounding reference signal (SRS) from the UE.

[0275] The method may also include the step of sending configuration information related to SRS. In the step of sending configuration information related to SRS, the base station sends the configuration information related to SRS to the UE. The configuration information related to SRS may include information based on method 1 (e.g., SRS antenna port, SRS resource set, configuration related to the application of SRS beam (ULTx spatial filter) determined based on the reported beam RS). The step of sending configuration information related to SRS may be performed before step S510 or step S520.

[0276] The base station receives CSI from the UE. The CSI may be calculated based on the UE's measurement of at least one DL RS.

[0277] The method may further include a step of sending DCI. In the step of sending DCI, the base station sends downlink control information (DCI) including an SRS request field to the UE. The step of sending DCI may be performed before step S510 or step S520.

[0278] The method may further include the step of sending a MAC CE. In the step of sending a MAC CE, the base station sends a medium access control element (MAC CE) to the UE. The step of sending a MAC CE may be performed before step S520.

[0279] The method may further include the step of sending a DL RS. Specifically, in the step of sending a DL RS, the base station sends at least one downlink reference signal (DL RS) to the UE. The step of sending a DL RS may be performed before step S510.

[0280] The operations based on steps S510 and S520, the step of sending configuration information related to CSI, the step of sending configuration information related to SRS, the step of sending DCI, the step of sending MAC CE, and the step of sending DL RS can be performed by Figure 6 For example, the base station 100 may control one or more transceivers 130 and / or one or more memories 140 to perform operations based on steps S510 and S520, a step of sending configuration information related to CSI, a step of sending configuration information related to SRS, a step of sending DCI, a step of sending MAC CE, and a step of sending DL RS.

[0281] Refer to the following Figure 6 The following describes a device to which the embodiments of the present disclosure are applicable (a device that implements the method / operation according to the embodiments of the present disclosure).

[0282] Figure 6 The configurations of the first device and the second device according to the embodiment of the present disclosure are illustrated.

[0283] The first device 100 may include a processor 110 , an antenna unit 120 , a transceiver 130 , and a memory 140 .

[0284] The processor 110 may perform signal processing related to the baseband, and includes a high-level processing unit 111 and a physical layer processing unit 115. The high-level processing unit 111 may process operations of a MAC layer, an RRC layer, or a higher layer. The physical layer processing unit 115 may process operations of a PHY layer. For example, if the first device 100 is a base station (BS) device in BS-UE communication, the physical layer processing unit 115 may perform uplink received signal processing, downlink transmitted signal processing, etc. For example, if the first device 100 is a first UE device in inter-UE communication, the physical layer processing unit 115 may perform downlink received signal processing, uplink transmitted signal processing, sidelink transmitted signal processing, etc. In addition to performing signal processing related to the baseband, the processor 110 may also control the overall operation of the first device 100.

[0285] The antenna unit 120 may include one or more physical antennas, and if the antenna unit 120 includes multiple antennas, MIMO transmission / reception is supported. The transceiver 130 may include a radio frequency (RF) transmitter and an RF receiver. The memory 140 may store information processed by the processor 110 and software, an operating system, and applications related to the operation of the first device 100. The memory 140 may also include components such as a buffer.

[0286] In the embodiments described in the present disclosure, the processor 110 of the first device 100 may be configured to implement operations of a BS in BS-UE communication (or operations of a first UE device in inter-UE communication).

[0287] The second device 200 may include a processor 210 , an antenna unit 220 , a transceiver 230 , and a memory 240 .

[0288] The processor 210 may perform signal processing related to the baseband, and includes a high-level processing unit 211 and a physical layer processing unit 215. The high-level processing unit 211 may process operations of a MAC layer, an RRC layer, or a higher layer. The physical layer processing unit 215 may process operations of a PHY layer. For example, if the second device 200 is a UE device in BS-UE communication, the physical layer processing unit 215 may perform downlink received signal processing, uplink transmitted signal processing, etc. For example, if the second device 200 is a second UE device in inter-UE communication, the physical layer processing unit 215 may perform downlink received signal processing, uplink transmitted signal processing, side link received signal processing, etc. In addition to performing signal processing related to the baseband, the processor 210 may also control the overall operation of the second device 210.

[0289] The antenna unit 220 may include one or more physical antennas, and if the antenna unit 220 includes multiple antennas, MIMO transmission / reception is supported. The transceiver 230 may include an RF transmitter and an RF receiver. The memory 240 may store information processed by the processor 210 and software, operating systems, and applications related to the operation of the second device 200. The memory 240 may also include components such as a buffer.

[0290] In the embodiments described in the present disclosure, the processor 210 of the second device 200 may be configured to implement the operation of the UE in BS-UE communication (or the operation of the second UE device in inter-UE communication).

[0291] The description of the BS and the UE in BS-UE communication (or the first UE device and the second UE device in inter-UE communication) in the examples of the present disclosure are equally applicable to the operations of the first device 100 and the second device 200, and redundant descriptions are omitted.

[0292] In addition to LTE, NR, and 6G, the wireless communication technology implemented in the apparatus 100 and the apparatus 200 according to the present disclosure may also include a narrowband Internet of Things (NB-IoT) for low-power communication. For example, the NB-IoT technology may be an example of a low-power wide area network (LPWAN) technology and may be implemented in standards such as LTE Cat NB1 and / or LTE Cat NB2. The NB-IoT technology is not limited to the above names.

[0293] Additionally or alternatively, the wireless communication technology implemented in the apparatus 100 and the apparatus 200 according to the present disclosure may perform communication based on the LTE-M technology. For example, the LTE-M technology may be an example of the LPWAN technology and may be referred to as various names, such as enhanced machine type communication (eMTC). For example, the LTE-M technology may be implemented with at least one of various standards, such as 1) LTE CAT0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-bandwidth limited), 5) LTE-MTC, 6) LTE machine type communication and / or 7) LTE M. The LTE-M technology is not limited to the above names.

[0294] Additionally or alternatively, in consideration of low power communication, the wireless communication technology implemented in the apparatus 100 and the apparatus 200 according to the present disclosure may include at least one of ZigBee, Bluetooth, and a low power wide area network (LPWAN), and is not limited to the above names. For example, ZigBee technology may create a personal area network (PAN) related to small / low power digital communication based on various standards such as IEEE 802.15.4, and may be referred to by various names.

Claims

1. A method performed by a user equipment UE in a wireless communication system, the method comprising the following steps: Reporting channel state information CSI, wherein the CSI includes at least one DLRS resource indicator; and Sending a sounding reference signal SRS, The SRS is sent based on at least one SRS resource, and The uplink transmission ULTx spatial filter associated with the at least one SRS resource is determined based on the at least one DL RS resource indicator.

2. The method according to claim 1, wherein: The at least one DLRS resource indicator is associated with simultaneous transmission of a UL Tx spatial filter by the UE based on an uplink.

3. The method according to claim 1, wherein: A UL Tx spatial filter related configuration configured in the at least one SRS resource is not used.

4. The method according to claim 1, wherein: Based on the fact that the UL Tx spatial filter related configuration is not configured in the at least one SRS resource, the UL Tx spatial filter is determined based on the at least one DL RS resource indicator.

5. The method according to claim 1, further comprising the steps of: receiving downlink control information DCI including an SRS request field, wherein at least one aperiodic SRS resource set is triggered based on the SRS request field, and The at least one SRS resource is based on the at least one non-periodic SRS resource set.

6. The method according to claim 5, wherein: The DCI includes a CSI request field, and The reporting of the CSI is triggered based on the CSI request field.

7. The method according to claim 5, wherein: The DCI includes a 1-bit field, and The 1-bit field indicates whether the at least one DLRS resource indicator is used to determine the ULTx spatial filter.

8. The method according to claim 5, wherein: A determination is made based on a code point of the SRS request field whether to use the at least one DLRS resource indicator to determine the ULTx spatial filter.

9. The method according to claim 1, further comprising the steps of: Receive a medium access control element MAC CE, wherein a semi-persistent SRS resource set is activated based on the MAC CE, and The at least one SRS resource is based on the semi-persistent SRS resource set.

10. The method according to claim 1, further comprising the steps of: receiving configuration information related to the CSI, The configuration information related to the CSI includes information related to group-based beam reporting.

11. The method according to claim 10, wherein: The CSI includes two DL RS resource indicators associated with each of the one or more groups.

12. The method according to claim 11, wherein: The UL Tx spatial filter includes two UL Tx spatial filters determined based on two DL RS resource indicators associated with a first group of the one or more groups.

13. The method according to claim 12, wherein: The two UL Tx spatial filters include i) a first UL Tx spatial filter determined based on a first DL RS resource indicator, and ii) a second UL Tx spatial filter determined based on a second DL RS resource indicator, and The beam quality value associated with the first DL RS resource indicator is greater than the beam quality value of the second DL RS resource indicator.

14. The method according to claim 13, wherein: The at least one SRS resource is an SRS resource associated with multiple antenna ports, wherein, for at least one first antenna port among the multiple antenna ports, the SRS is sent based on the first UL Tx spatial filter, and For at least one second antenna port among the multiple antenna ports, the SRS is sent based on the second UL Tx spatial filter.

15. The method according to claim 13, wherein: The at least one SRS resource is a plurality of SRS resources, wherein, for at least one first SRS resource among the plurality of SRS resources, the SRS is sent based on the first ULTx spatial filter, and For at least one second SRS resource among the multiple SRS resources, the SRS is sent based on the second UL Tx spatial filter.

16. The method according to claim 15, wherein: The at least one first SRS resource is based on a first SRS resource set in a plurality of SRS resource sets, and The at least one second SRS resource is based on a second SRS resource set among the multiple SRS resource sets.

17. The method according to claim 16, further comprising the steps of: receiving configuration information related to the SRS, The configuration information related to the SRS includes information for the multiple SRS resource sets.

18. The method according to claim 10, wherein: The configuration information related to the CSI includes a reporting amount related to the CSI, and The reported amount is set as i) "cri"-"reference signal received power RSRP", ii) "ssb-Index"-"RSRP", iii) "cri"-"RSRP"-"Index" or iv) "ssb-Index"-"RSRP"-"Index".

19. The method according to claim 18, wherein: The cri is a channel state information-reference signal CSI-RS resource indicator CRI, and the ssb-Index is a SS / PBCH block SSB resource indicator SSBRI, Wherein, the Index is the index of the UE capability value set, and The index based on the UE capability value set indicates the maximum number of SRS antenna ports supported.

20. The method according to claim 19, wherein: The CSI also includes the index of the UE capability value set.

21. The method according to claim 1, wherein: The at least one SRS resource is based on at least one SRS resource set, and The purpose of the at least one SRS resource set is set to codebook, non-codebook, antenna switching or beam management.

22. The method according to claim 1, wherein: The SRS is an aperiodic SRS or a semi-persistent SRS.

23. A user equipment operating in a wireless communication system, the user equipment comprising: one or more transceivers; one or more processors; as well as one or more memories operatively connectable to the one or more processors and storing instructions that upon execution by the one or more processors configure the one or more processors to perform operations, The operations include: reporting channel state information (CSI), wherein the CSI includes at least one DL RS resource indicator; and Sending a sounding reference signal SRS, The SRS is sent based on at least one SRS resource, and The uplink transmission UL Tx spatial filter associated with the at least one SRS resource is determined based on the at least one DL RS resource indicator.

24. A device, comprising: one or more memories; as well as one or more processors operatively connected to the one or more memories, wherein the one or more memories include instructions that, upon being executed by the one or more processors, configure the one or more processors to perform operations, The operations include: reporting channel state information (CSI), wherein the CSI includes at least one DL RS resource indicator; and Sending a sounding reference signal SRS, The SRS is sent based on at least one SRS resource, and The uplink transmission UL Tx spatial filter associated with the at least one SRS resource is determined based on the at least one DL RS resource indicator.

25. One or more non-transitory computer-readable media, the one or more non-transitory computer-readable media storing one or more instructions, in, The one or more instructions executable by one or more processors configure the one or more processors to perform operations, The operations include: reporting channel state information (CSI), wherein the CSI includes at least one DL RS resource indicator; and Sending a sounding reference signal SRS, The SRS is sent based on at least one SRS resource, and The uplink transmission UL Tx spatial filter associated with the at least one SRS resource is determined based on the at least one DL RS resource indicator.

26. A method performed by a base station in a wireless communication system, the method comprising the steps of: receiving channel state information (CSI), wherein the CSI includes at least one DL RS resource indicator; and receiving a sounding reference signal SRS, The SRS is received based on at least one SRS resource, and The uplink transmission UL Tx spatial filter associated with the at least one SRS resource is determined based on the at least one DL RS resource indicator.

27. A base station operating in a wireless communication system, the base station comprising: one or more transceivers; one or more processors; as well as one or more memories operatively connectable to the one or more processors and storing instructions that upon execution by the one or more processors configure the one or more processors to perform operations, The operations include: receiving channel state information (CSI), wherein the CSI includes at least one DL RS resource indicator; and receiving a sounding reference signal SRS, The SRS is received based on at least one SRS resource, and The uplink transmission UL Tx spatial filter associated with the at least one SRS resource is determined based on the at least one DL RS resource indicator.

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