Method and apparatus for beam reporting in a wireless communication system

Abstract

A method performed by a terminal in a wireless communication system according to an embodiment of the present specification includes receiving configuration information related to channel state information (CSI), receiving at least one downlink reference signal (DL RS), calculating CSI based on measurements for the at least one DL RS, and reporting the CSI. The CSI includes a resource indicator associated with each group among one or more groups. The resource indicator is related to simultaneous transmission based on spatial filters by the terminal.

Description

[Technical Field]

[0001] The present specification relates to a method and apparatus for beam reporting in a wireless communication system. [Background technology]

[0002] Mobile communication systems were developed to provide voice services while ensuring user activity. However, the scope of mobile communication systems has expanded beyond voice to include data services, and currently, explosive traffic growth is causing resource shortages and users are demanding faster services, so more advanced mobile communication systems are required.

[0003] The requirements for next-generation mobile communication systems are significant: they must be able to accommodate explosive data traffic, dramatically increase the transmission rate per user, accommodate a significantly increased number of connected devices, achieve extremely low end-to-end latency, and be energy efficient. To achieve this, various technologies are being researched, including dual connectivity, massive multiple input multiple output (MIMO), in-band full duplex, non-orthogonal multiple access (NOMA), super wideband support, and device networking.

[0004] Rel-17 MIMO introduces panel-specific beam reporting, which improves on the conventional beam reporting method. Specifically, the UE capability (set) index corresponding to the terminal panel or panel type is reported, and UL / DL panel selection of the terminal can be supported based on this information. However, the information reported by the existing panel-specific beam reporting does not take into account simultaneous transmission across multiple panels (STxMP) of the terminal. Summary of the Invention [Problem to be solved by the invention]

[0005] As mentioned above, the information reported by the existing panel-specific beam report does not take STxMP into account, and it is not possible to determine whether STxMP is supported by the terminal based on the reported information (e.g., CRI, SSBRI).

[0006] In other words, according to the existing beam reporting method, the terminal cannot report beam information (e.g., CRI, SSBRI) for which STxMP is supported to the base station, and therefore, operations based on beam information (e.g., CRI, SSBRI) for which STxMP is supported cannot be supported.

[0007] The objective of this specification is to propose a method for reporting beams (e.g., CRI(s) and / or SSBRI(s)) on which simultaneous transmission by a terminal is supported.

[0008] The technical problems to be solved in this specification are not limited to the technical problems mentioned above, and another technical problem not mentioned will be clearly understood by a person having ordinary skill in the art to which the present invention pertains from the description below. [Means for solving the problem]

[0009] A method performed by a terminal in a wireless communication system according to one embodiment of the present specification includes receiving configuration information related to channel state information (CSI), receiving at least one downlink reference signal (DL RS), calculating CSI based on measurements for the at least one DL RS, and reporting the CSI.

[0010] The configuration information includes information regarding group based beam reporting.

[0011] The CSI includes a resource indicator associated with each group among one or more groups, the resource indicator being associated with simultaneous transmission by the terminal based on spatial filters.

[0012] The configuration information may include a report quantity associated with the CSI.

[0013] The report quantity may be set to i) 'cri'-'RSRP (reference signal Received Power)', ii) 'ssb-Index'-'RSRP', iii) 'cri'-'RSRP'-'Index' or iv) 'ssb-Index'-'RSRP'-'Index'.

[0014] The cri is a CSI-RS resource indicator (CRI-RS resource indicator, CRI), and the ssb-Index is an SSB resource indicator (SS / PBCH block (SSB) resource indicator, SSBRI),

[0015] The index may be an index of a UE capability value set.

[0016] A maximum supported number of SRS antenna ports may be indicated based on an index of the terminal performance value set.

[0017] The resource indicator may include i) two CRIs or ii) two SSBRIs.

[0018] The CSI-RS resources and / or SSB resources of each group may be applied to the simultaneous transmission.

[0019] The CSI-RS resources and / or SSB resources of each group may be received simultaneously by the terminal.

[0020] The simultaneous transmission may be performed based on the UE capability.

[0021] The terminal performance may be related to the maximum supported number of SRS antenna ports.

[0022] The CSI may further include an index of the UE capability value set.

[0023] Based on information regarding the group based beam reporting, the CSI including a first resource indicator or a second resource indicator associated with each of the groups may be reported.

[0024] The resources based on the first resource indicator may be received simultaneously by the terminals and may be applied to the simultaneous transmission.

[0025] Resources based on the second resource indicator may be applied to the simultaneous transmission.

[0026] The information regarding group based beam reporting indicates a first value associated with reporting the first resource indicator or a second value associated with reporting the second resource indicator.

[0027] The resource indicator may be based on two resource indicators, and one CSI-RS or one SSB may be selected from each of two CSI resource sets based on the two resource indicators.

[0028] A terminal operating in a wireless communication system according to another embodiment of the present specification includes one or more transceivers, one or more processors, and one or more memories operably connected to the one or more processors and storing instructions that configure the one or more processors to perform operations based on operations performed by the one or more processors.

[0029] The operations include receiving configuration information related to Channel State Information (CSI), receiving at least one Down Link-reference signal (DL RS), calculating the CSI based on measurements for the at least one DL RS, and reporting the CSI.

[0030] The configuration information includes information regarding group based beam reporting.

[0031] The CSI includes a resource indicator associated with each group among one or more groups, the resource indicator being associated with simultaneous transmission by the terminal based on spatial filters.

[0032] An apparatus according to yet another embodiment herein includes one or more memories and one or more processors operatively coupled to the one or more memories.

[0033] The one or more memories contain instructions that, upon being executed by the one or more processors, configure the one or more processors to perform actions.

[0034] The operations include receiving configuration information related to Channel State Information (CSI), receiving at least one Down Link-Reference Signal (DL RS), calculating the CSI based on measurements for the at least one DL RS, and reporting the CSI.

[0035] The configuration information includes information regarding group based beam reporting.

[0036] The CSI includes a resource indicator associated with each group among one or more groups, the resource indicator being associated with simultaneous transmission by the terminal based on spatial filters.

[0037] According to yet another embodiment of the present disclosure, one or more non-transitory computer-readable media store one or more instructions.

[0038] One or more instructions executable by one or more processors configure the one or more processors to perform an operation.

[0039] The operations include receiving configuration information related to Channel State Information (CSI), receiving at least one Down Link-Reference Signal (DL RS), calculating CSI based on measurements for the at least one DL RS, and reporting the CSI.

[0040] The configuration information includes information regarding group based beam reporting.

[0041] The CSI includes a resource indicator associated with each group of one or more groups, the resource indicator being associated with simultaneous transmission by the terminal based on spatial filters.

[0042] According to another embodiment of the present specification, a method performed by a base station in a wireless communication system includes the steps of transmitting configuration information related to channel state information (CSI), transmitting at least one downlink reference signal (DL RS), and receiving the CSI.

[0043] The configuration information includes information regarding group-based beam reporting, and the CSI is calculated based on measurements of the terminal for the at least one DL RS.

[0044] The CSI includes information on a resource indicator associated with each group among one or more groups, the resource indicator being associated with simultaneous transmission by the terminal based on spatial filters.

[0045] A base station operating in a wireless communication system according to another embodiment of the present specification includes one or more transceivers, one or more processors, and one or more memories operably connected to the one or more processors and storing instructions that, when executed by the one or more processors, configure the one or more processors to perform operations.

[0046] The operations include transmitting configuration information related to Channel State Information (CSI), transmitting at least one Down Link-Reference Signal (DL RS), and receiving the CSI.

[0047] The configuration information includes information regarding group-based beam reporting, and the CSI is calculated based on measurements of the terminal for the at least one DL RS.

[0048] The CSI includes information regarding a resource indicator associated with each group among one or more groups, the resource indicator being associated with simultaneous transmission by the terminal based on spatial filters. [Effects of the Invention]

[0049] According to embodiments herein, resource indicators associated with simultaneous transmissions by terminals are reported based on a group-based beam reporting scheme.

[0050] Based on the reported resource indicator, it can be determined whether the corresponding terminal supports STxMP, so that after the reporting operation, UL scheduling / UL transmission based on a beam that supports STxMP can be performed.

[0051] Since the resource indicator related to simultaneous transmission by the terminal is based on settings related to the existing group-based beam reporting scheme, the implementation complexity required to support reporting of information regarding whether or not STxMP is supported can be minimized.

[0052] The effects obtained in this specification are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Brief explanation of the drawings]

[0053] [Figure 1] An example of beamforming using SSB and CSI-RS is shown below. [Figure 2] 10 is a flowchart illustrating an example of a DL BM procedure using SSB. [Figure 3] 1 illustrates a signaling procedure according to an embodiment of the present disclosure; [Figure 4]10 is a flowchart illustrating a method performed by a terminal according to an embodiment of the present specification. [Figure 5] 10 is a flowchart illustrating a method performed by a base station according to another embodiment of the present disclosure. [Figure 6] 1 is a diagram illustrating the configuration of a first device and a second device according to an embodiment of the present specification. DETAILED DESCRIPTION OF THE INVENTION

[0054] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The detailed description disclosed below, together with the accompanying drawings, is intended to describe exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention can be practiced. The following detailed description includes specific details to provide a thorough understanding of the present invention. However, those skilled in the art will recognize that the present invention can be practiced without such specific details.

[0055] In some cases, well-known structures and devices may be omitted or shown in block diagram form, focusing on the core functions of each structure and device, in order to avoid obscuring the concepts of the present invention.

[0056] Hereinafter, downlink (DL) refers to communication from a base station to a terminal, and uplink (UL) refers to communication from the terminal to the base station. In the downlink, the transmitter may be part of the base station, and the receiver may be part of the terminal. In the uplink, the transmitter may be part of the terminal, and the receiver may be part of the base station. The base station may also be expressed as a first communication device, and the terminal may also be expressed as a second communication device. The base station (BS) may also be replaced with terms such as fixed station, NodeB, evolved-NodeB (eNB), Next Generation NodeB (gNB), base transceiver system (BTS), access point (AP), network (5G network), AI system, road side unit (RSU), vehicle, robot, unmanned aerial vehicle (UAV), augmented reality (AR) device, and virtual reality (VR) device. Furthermore, a terminal may be fixed or mobile, and may be replaced with terms such as UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS (Advance Mobile Station), WT (Wireless terminal), MTC (Machine-Type Communication) device, M2M (Machine-to-Machine) device, D2D (Device-to-Device) device, vehicle, robot, AI module, drone (Unmanned Aerial Vehicle, UAV), AR (Augmented Reality) device, VR (Virtual Reality) device, etc.

[0057] Beam Management (BM)

[0058] The BM procedure is an L1 (layer 1) / L2 (layer 2) procedure 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 and reception, and includes the following procedures and terminology:

[0059] Beam measurement: An operation in which a base station or UE measures the characteristics of a received beamformed signal.

[0060] -Beam determination: The operation in which a base station or a UE selects its own transmit beam (Tx beam) / receive beam (Rx beam).

[0061] Beam sweeping: The act of covering a spatial region using transmit and / or receive beams in a predetermined manner during a fixed time interval.

[0062] Beam report: An operation in which a UE reports information about a beamformed signal based on beam measurements.

[0063] The BM procedure is divided into (1) a DL BM procedure using a synchronization signal (SS) / physical broadcast channel (PBCH) block or CSI-RS, and (2) a UL BM procedure using a sounding reference signal (SRS).

[0064] Each BM procedure also includes a Tx beam sweeping for determining a Tx beam and an Rx beam sweeping for determining an Rx beam.

[0065] DL BM

[0066] The DL BM procedure includes (1) a base station transmitting a beamformed DL reference signal (RS) (e.g., CSI-RS or SS Block (SSB)) and (2) a terminal beam reporting.

[0067] Here, the beam reporting may include preferred DL RS ID(s) and corresponding L1-RSRP(Reference Signal Received Power).

[0068] The DL RS ID may be an SSB Resource Indicator (SSBRI) or a CSI-RS Resource Indicator (CRI).

[0069] Figure 1 shows an example of beamforming using SSB and CSI-RS.

[0070] As shown in Figure 1, SSB beam and CSI-RS beam are used for beam measurement. The measurement metric is L1-RSRP per resource / block. SSB is used for coarse beam measurement, and CSI-RS may be used for fine beam measurement. SSB can be used for both Tx beam sweeping and Rx beam sweeping.

[0071] Rx beam sweeping using SSB can be performed by the UE changing the Rx beam for the same SSBRI across multiple SSB bursts, where one SS burst includes one or more SSBs, and one SS burst set includes one or more SSB bursts.

[0072] FIG. 2 is a flowchart showing an example of a DL BM procedure using SSB.

[0073] The configuration for beam reporting using SSB is performed during CSI / beam configuration in the RRC connected state (or RRC connected mode).

[0074] The terminal receives a CSI-ResourceConfig IE including a CSI-SSB-ResourceSetList including SSB resources used for the BM from the base station (S210).

[0075] An example of the CSI-ResourceConfig IE is shown in Table 1. As shown in Table 1, the BM configuration using SSB is not separately defined, and the SSB is configured as a CSI-RS resource.

[0076] [Table 1]

[0077] In Table 1, the csi-SSB-ResourceSetList parameter indicates a list of SSB resources used for beam management and reporting in one CSI-RS resource set, where the SSB resource set may be set to {SSBx1, SSBx2, SSBx3, SSBx4, ...}. For example, the SSB index may be defined from 0 to 63.

[0078] The terminal receives SSB resources from the base station based on the CSI-SSB-ResourceSetList (S220).

[0079] If a CSI-ReportConfig related to reporting on SSBRI and L1-RSRP is configured, the terminal reports (beams) the best SSBRI and the corresponding L1-RSRP to the base station (S230).

[0080] That is, if the reportQuantity of the CSI-ReportConfig IE is set to 'ssb-Index-RSRP', the terminal reports the best SSBRI and the corresponding L1-RSRP to the base station.

[0081] Furthermore, if a CSI-RS resource is configured in the same OFDM symbol(s) as the SSB (SS / PBCH block) and "QCL-Type D" is applicable, the terminal can assume that the CSI-RS and SSB are quasi-colocated from the perspective of "QCL-Type D."

[0082] Here, the QCL Type D may mean that QCL is established between antenna ports in terms of spatial Rx parameters. When a UE receives from multiple DL antenna ports in a QCL Type D relationship, the same receive beam may be applied. In addition, the UE does not expect CSI-RS to be configured in REs that overlap with SSB REs.

[0083] BM enhancements in NR Rel-16

[0084] The DL / UL beam indication standardized in 3GPP (registered trademark) NR Rel-15 is designed to indicate beams separately for each DL / UL channel / RS resource to ensure beam indication flexibility, and such indication methods are designed separately for each channel / RS.

[0085] This design approach ultimately posed problems such as high signaling overhead and beam change latency, as the base station must issue beam change instructions to the terminals for each channel / RS resource in order to change the serving beam for multiple terminals communicating with the base station using a single beam. Along with the UL beam change, UL power control-related parameters, especially the pathloss RS (PL RS), must also be changed for each UL channel / RS, which also poses signaling overhead and latency issues. To address these shortcomings, Rel-16 introduced five features. Table 2 below shows examples of these five features.

[0086] [Table 2-1]

[0087] [Table 2-2]

[0088] In Rel-16, in addition to the beam / PL RS indication-related enhancements, beam reporting-related enhancements have also been made. Rel-15 supported a mode in which the UE measures and reports the L1-RSRP for each beam RS. However, in an environment with significant inter-beam interference, it is difficult to guarantee that a particular beam RS's L1-RSRP, i.e., high reception strength, has excellent quality as a serving beam. In other words, the UE may select and report to the base station a beam with high reception strength but also high beam interference. To overcome this drawback, Rel-16 newly supports a beam reporting mode in which the base station configures not only channel measurement RSs but also interference measurement resources. The UE measures the L1-SINR for the corresponding channel resources and interference resources based on this and reports several RSs with high L1-SINR values.

[0089] BM enhancements in NR Rel-17

[0090] As mentioned above, various BM enhancements were made in Rel-16. In particular, a feature was created that can significantly reduce signaling overhead / latency related to the beam direction method. However, for terminals operating in a single serving beam, the beam still could not be set / directed in a channel / RS integrated manner.

[0091] Based on this motivation, Rel-17 plans to standardize a channel / RS unified beam configuration / indication method. In NR, DL beams are indicated via a transmit configuration indicator (TCI), which is called the unified TCI state. While existing TCI states are configured / indicated separately for each DL RS / channel, the unified TCI state features unified configuration / indication. Essentially, the DL unified TCI state indicates QCL type-D RSs jointly applied to (some) PDCCH, PDSCH, and (some) CSI-RS resources, while the UL unified TCI state indicates spatial relation RSs (and PL RSs) jointly applied to (some) PUCCH, PUSCH, and (some) SRS resources. Furthermore, similar to the Rel-16 default spatial relation / PL RS feature, UL spatial relations and PL RSs can be matched with DL beam RSs for UEs with established beam correspondence. Therefore, the channels / RSs to which the unified TCI state applies can cover both DL and UL channels / RSs. This is called the joint DL / UL TCI state. In other words, the following two modes are planned to be supported:

[0092] Joint DL / UL TCI configuration / indication mode: The DL RS configured / indicated in the Joint TCI state is not only applied as a QCL type-D source RS for the DL channel / RS, but also as a spatial relation RS (and PL RS) for the UL channel / RS. That is, when an update of the joint TCI state is instructed, the beam RS (and PL RS) for the corresponding DL channel / RS and UL channel / RS are changed together.

[0093] Separate DL and UL TCI configuration / indication mode: The QCL type-D source RS for the DL channel / RS is jointly configured / indicated in the DL TCI state, and the spatial relation RS (and PL RS) for the UL channel / RS is jointly configured / indicated in the UL TCI state. Here, the DL TCI state and the UL TCI state are configured / indicated separately.

[0094] The DL / UL / joint TCI states are to be indicated / updated via MAC-CE and / or DCI. More specifically, one or more TCI states among multiple TCI states (called TCI state pool) configured in RRC are activated in MAC-CE. If multiple TCI states are activated in MAC-CE, one of the TCI states is indicated via DCI.

[0095] Such DCI indication will be supported via the downlink DCI format (DCI1-1 / 1-2) that supports the TCI field, and will be supported not only with PDSCH scheduling but also without it. In the latter case, PDSCH scheduling is omitted (similar to the DCI-based semi-persistent scheduling (SPS) release method), so ACK transmission by the UE for the corresponding DCI will be supported.

[0096] Enhancements related to beam reporting will be made in Rel-17. The Rel-17 beam report mode will support a mode in which the terminal measures / reports the optimal beam RS for each TRP, targeting multi-TRP environments. To this end, the base station will divide the beam measurement RS set / group into two subsets / sub-groups, and the terminal will select an RS for each subset / sub-group and report it along with the quality value of the corresponding RS (L1-RSRP, [L1-SINR]).

[0097] In this document, " / " means "and", "or", or "and / or", depending on the context.

[0098] In this specification, the QCL type-D RS or TCI state or abbreviated TCI may refer to a spatial parameter, i.e., the QCL reference RS from the beam perspective. The QCL reference RS may be expanded to include the reference RS or source RS for that parameter or other beam / spatial related parameters.

[0099] In this specification, a "beam" may refer to a spatial filter determined based on the reference RS or the source RS. The spatial filter may include a spatial domain filter, a spatial domain transmission filter, and a spatial domain receive filter.

[0100] As an example, the 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 transmission 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).

[0101] As an example, the beam associated with the DL 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 transmission 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).

[0102] For example, when beam reciprocity is established, the DL beam and the UL beam may be referred to as a spatial filter or a spatial domain filter. Specifically, when beam reciprocity is established, a specific UL beam may be identical to a specific DL beam. For example, a UL beam used for uplink transmission of a terminal can be determined based on measurements of the DL beam used for transmission of the base station. For example, a DL beam used for downlink transmission of a base station can be determined based on measurements of the UL beam used for transmission of the terminal.

[0103] In addition, in an environment where analog beamforming is not used, such as in a low frequency band, the indication of the QCL type-D RS may be omitted. In such a case, the QCL type-D RS in this specification may be interpreted as the QCL reference RS (i.e., if there is only one reference RS in the TCI state, this RS may be referred to).

[0104] Furthermore, from the UL perspective, the TCI state (or TCI for short) may refer to the reference / source RS for the UL beam. From the UL perspective, the TCI state may indicate the spatial relation RS (and pathloss RS) in the existing Rel-15 / 16. Here, the pathloss RS may be the same as the corresponding RS, or may be configured in association with or separately from the UL TCI state.

[0105] In Rel-17 MIMO, the beam reporting method supported in the previous release has been evolved to report the UE capability (set) index corresponding to the terminal panel or panel type, and a reporting enhancement method has been standardized to support terminal uplink (UL) (and downlink, DL) panel selection using this. For convenience, this method will be referred to as panel-specific beam reporting.

[0106] This method assumes that the UE performs UL transmission using one panel at a time to support rapid change of the UE panel. The panel-specific beam report can be performed based on Table 3. In Table 3 below, the parameter name corresponding to the UE capability (set) index is written as "Capability[Set]Index." However, the name "Capability[Set]Index" is used for convenience of explanation, and "UE Capability (set) index" may be referred to by other terms (e.g., Index).

[0107] Hereinafter, for convenience of description, this index ("UE Capability (set) index") will be referred to as "C-ID." A terminal can report how many C-IDs it has to a base station as a UE Capability report.

[0108] Each C-ID indicates the maximum number of SRS ports supported by the terminal (the maximum number of SRS antenna ports supported by the terminal). That is, Rel-17 C-IDs are defined only for panels with different numbers of SRS ports.

[0109] For example, a 4-panel UE may be configured with panel #0 (2 ports), panel #1 (2 ports), panel #2 (4 ports), and panel #3 (4 ports), where panel #0 and panel #1 can be mapped to C-ID #0, and panel #2 and panel #3 can be mapped to C-ID #1.

[0110] The terminal can report to the base station C-ID#0 with max supported SRS ports = 2 and C-ID#1 with max supported SRS ports = 4. Based on this, the C-ID and its associated UE capability information (e.g., the maximum number of SRS ports) can be understood as a report for a certain panel type.

[0111] In Table 3 below, panel-specific beam report corresponds to an operation of including the C-ID reported as the UE Capability in a beam report and reporting it (instantaneously / periodically).

[0112] When an existing beam report is set / instructed, the terminal operates as follows. The terminal reports to the base station i) the index (i.e., CRI or SSBRI) of the RS associated with the best N base station Tx beams and ii) the L1-RSRP or L1-SINR value, which is the reception quality value of the corresponding RS. Here, the N RS indexes can be selected / reported regardless of the terminal Rx panel. N can be set to the terminal by the base station as a value between 1 and 4.

[0113] When a panel-specific beam report is configured / instructed, the terminal operates as follows: The terminal reports the optimal C-ID for each CRI / SSBRI to the base station along with the L1-RSRP / L1-SINR(s) associated with the CRI / SSBRI(s). For example, for N=4, the terminal may report the first two CRIs as C-ID#0 and the remaining two CRIs as C-ID#1. According to this example, the four CRIs reported by the terminal can be interpreted as follows in relation to the terminal panel:

[0114] The first two CRIs reported for C-ID#0 mean the following: when the base station receives (and / or transmits) using one of the beams corresponding to the first two CRIs, 1) the terminal prefers to transmit using the panel corresponding to C-ID#0 (or one of the corresponding panels), or 2) using the panel corresponding to C-ID#0 (or one of the corresponding panels) is more advantageous than using the panel corresponding to another C-ID (i.e., C-ID#1).

[0115] The remaining two CRIs reported as C-ID#1 mean the following:

[0116] When the base station receives (and / or transmits) using a beam corresponding to one of the remaining two CRIs, either 1) the terminal prefers to transmit using the panel corresponding to C-ID#1 (or one of the corresponding panels), or 2) using the panel corresponding to C-ID#1 (or one of the corresponding panels) is more advantageous than using the panel corresponding to another C-ID (i.e., C-ID#0).

[0117] [Table 3-1]

[0118] [Table 3-2]

[0119] [Table 3-3]

[0120] Based on the panel-specific beam report, the base station can change / instruct the best DL beam (e.g., DL TCI state) and / or the best UL beam (e.g., UL TCI state, spatial relation RS).

[0121] A study on methods to support simultaneous transmission across multiple panels (STxMP) has been initiated in the Rel-18 MIMO work item. This paper proposes a method to extend the Rel-17 panel-specific beam report to support / consider STxMP.

[0122] Preferably, the C-ID can be extended to be expressed for terminal panel (type) attributes other than the maximum number of SRS ports. Therefore, it can be extended so that different C-IDs can be assigned to panels that support the same number of maximum SRS ports. This is because STxMP can be supported for panels that correspond to the same number of UL ports. Furthermore, C-ID combinations for which STxMP is possible and / or not possible can be reported to the base station. For example, the terminal can configure and report STxMP capable and / or incapable C-ID pairs. Based on this terminal report, the base station can determine whether STxMP is possible (or not) when using a CRI / SSBRI corresponding to a specific C-ID as the UL TCI (or spatial relation).

[0123] In conjunction with or in place of the above method, the STxMP reporting method can be defined as follows:

[0124] Method 1

[0125] According to the base station's reporting settings, the terminal reports information about CRI / SSBRI (or CRI / SSBRI pair / group) for which STxMP is possible and / or not, along with information about C-ID (or C-ID pair / group) when reporting a panel-specific beam.

[0126] For example, the base station may request / configure the terminal to report a beam for an STxMP-capable panel. Such a request may cause the terminal to report an index (or pair / group index) for an STxMP-capable C-ID (or C-ID pair / group). Here, the terminal may also report the following i) and / or ii):

[0127] i) CRI(s) / SSBRI(s) and / or ii) beam quality values related to the relevant CRI(s) / SSBRI(s) (e.g., L1-RSRP, L1-SINR)

[0128] The CRI(s) / SSBRI(s) in i) may be a CRI / SSBRI preferred by the terminal to be applied as a UL TCI (or spatial relation RS), i.e., the corresponding CRI / SSBRI(s) may be applied as a UL TCI (or spatial relation RS) for a panel based on the STxMP capable C-ID.

[0129] As another example, the base station may request / configure the UE to report information regarding STxMP availability together with the beam report. The 'STxMP availability' may be reported via a separate indicator or may be implicitly reported as grouping information for CRI / SSBRI and / or C-ID.

[0130] As an example, CRI / SSBRI and / or C-IDs belonging to the same group / pair / set may be considered STxMP capable, while CRI / SSBRI and / or C-IDs not belonging to the same group / pair / set may be considered STxMP incapable. Conversely to the above example, CRI / SSBRI and / or C-IDs belonging to the same group / pair / set may be considered STxMP incapable, while CRI / SSBRI and / or C-IDs not belonging to the same group / pair / set may be considered STxMP capable.

[0131] When N=4 and beam RS type=CSI-RS, the UE may report according to the following examples 1 to 4 based on method 1.

[0132] Example 1) A terminal can report four CRIs and two C-ID pair information as follows:

[0133] {CRI#1(+L1-RSRP / SINR), CRI#3(+L1-RSRP / SINR), C-ID pair#0}

[0134] {CRI#2(+L1-RSRP / SINR), CRI#4(+L1-RSRP / SINR), C-ID pair#1}

[0135] Example 2) The terminal can report four CRIs and four C-IDs in two groups as follows:

[0136] {CRI#1(+L1-RSRP / SINR)+C-ID#0, CRI#3(+L1-RSRP / SINR)+C-ID#1}

[0137] {CRI#2(+L1-RSRP / SINR)+C-ID#2, CRI#4(+L1-RSRP / SINR)+C-ID#3}

[0138] Example 3) A terminal can report CRI pairs and C-ID pairs as follows:

[0139] CRI pair#1+C-ID pair#0(+RSRPs), CRI pair#2+C-ID#1(+RSRPs), ...

[0140] In the above example, the C-ID pair may refer to an STxMP capable or STxMP incapable C-ID, or an index for the corresponding pair may be assigned separately.

[0141] In example 2, CRI / C-IDs belonging to the same group may mean STxMP capable or STxMP incapable.

[0142] In Example 3, the CRI pair may be information selected by the terminal based on information about multiple CSI-RS resource pairs preset by the base station. As an example, a combination of CSI-RS resources belonging to a CRI pair (candidate group) refers to a combination of beams and RSs that can simultaneously receive each terminal transmission beam with the reception beam corresponding to the corresponding CSI-RS resource of the base station. Depending on the implementation of the base station, the CRI pair corresponds to a combination of beams transmitted from different TRPs or different panels of the same TRP.

[0143] For reference, the beam reporting methods supported in the existing 3GPP NR standard are divided into group-based beam reporting and non-group-based beam reporting, as shown below. In Rel-17, an evolved version of the group-based reporting method was introduced, taking into account simultaneous MTRP transmission (groupBasedBeamReporting-r17).

[0144] Specifically, two CSI resource sets can be configured in Resource Setting. Each CSI resource set can be considered as a set of beam RSs transmitted from each TRP. For example, the UE can receive information (e.g., CSI-AssociatedReportConfigInfo) including a first resource set and a second resource set. Each resource set may be associated with a CSI-RS or an SSB. For example, resourcesForChannel in CSI-AssociatedReportConfigInfo may correspond to the first resource set, and resourcesForChannel2 in CSI-AssociatedReportConfigInfo may correspond to the second resource set. Specifically, the first resource set (e.g., resourceSet or csi-SSB-ResourceSet) can be configured based on resourcesForChannel, and the second resource set (e.g., resourceSet2 or csi-SSB-ResourceSet2) can be configured based on resourcesForChannel2.

[0145] A UE receiving such a reporting setting / instruction selects one resource (i.e., CRI or SSBRI) from each CSI resource set and reports resource pair information on a group basis. That is, resource pairs belonging to the same group correspond to beam pairs that support simultaneous reception (and / or simultaneous transmission).

[0146] The method 1 can be extended to reporting not only "beam pairs that can be received simultaneously" but also "beam pairs that can be transmitted simultaneously." In other words, the existing group-based beam reporting can also be performed for the uplink. Based on the method 1, the following embodiments can be considered.

[0147] According to one embodiment, the terminal can report "beam pairs capable of simultaneous reception and transmission" or "beam pairs capable of simultaneous transmission" depending on the reporting configuration of the base station. As a specific example, the reporting configuration may include a configuration related to the group-based beam reporting. Based on the configuration related to the group-based beam reporting (e.g., groupBasedBeamReporting parameter), the terminal can report CSI including information about the "beam pairs capable of simultaneous transmission" or "beam pairs capable of simultaneous reception and transmission" to the base station.

[0148] As an example, the groupBasedBeamReporting parameter may be set to a first value or a second value (see Table 5 below). The first value (e.g., JointULandDL) may be associated with the "beam pair capable of simultaneous reception and transmission." The second value (e.g., ULOnly) may be associated with the "beam pair capable of simultaneous transmission."

[0149] The information about the "beam pair capable of simultaneous reception and transmission" or "beam pair capable of simultaneous transmission" is based on two CRIs (or two SSBRIs) of each group among one or more groups.

[0150] In the case of a "beam pair capable of simultaneous reception and transmission," resources (two CSI-RS resources or two SSB resources) based on two CRIs (or two SSBRIs) can be received simultaneously by a terminal. In other words, two CSI-RSs (or two SSBs) based on the two CRIs (or two SSBRIs) can be received simultaneously by a terminal. Furthermore, the resources (two CSI-RS resources or two SSB resources) based on the two CRIs (or two SSBRIs) can be applied to simultaneous transmission by a terminal based on a spatial filter.

[0151] In the case of a "simultaneous transmission capable beam pair": Resources (two CSI-RS resources or two SSB resources) based on the two CRIs (or two SSBRIs) can be applied to simultaneous transmission based on a spatial filter by the terminal.

[0152] The spatial filters may refer to uplink transmit spatial filters (UL Tx spatial filters), which may be determined based on the two CRIs (or two SSBRIs).

[0153] According to one embodiment, the base station's reporting configuration is the same as that of the existing scheme, but the terminal can additionally report an indicator for whether simultaneous transmission is possible for each group. In other words, the base station can perform group-based beam reporting configuration from the DL perspective (e.g., groupBasedBeamReporting='enabled' or groupBasedBeamReporting-r17). Here, the terminal can additionally report a "(1-bit) indicator for whether simultaneous transmission is possible" for each group (e.g., resource group or beam group).

[0154] [Table 4]

[0155] Information regarding the aforementioned "simultaneous transmittable beam pair" or "simultaneous receive and transmittable beam pair" can be reported based on Table 5 below.

[0156] [Table 5]

[0157] Method 1 is a method in which the terminal selects / reports the combination of STxMP panels and beams. On the other hand, a method in which the base station sets / specifies the combination of STxMP panels or the candidate group of STxMP panels is also considered. The related operations will be specifically described in Method 2 below.

[0158] Method 2

[0159] The base station may specify / configure a specific C-ID pair / group to the terminal in the beam report of the terminal. The specific C-ID pair / group may include i) a pair / group capable of STxMP (STxMP capable pair / group) and / or ii) a pair / group incapable of STxMP (STxMP incapable pair / group).

[0160] The terminal can report information about the CRI / SSBRI corresponding to the corresponding C-ID pair / group to the base station.

[0161] Specifically, the following operations are performed based on Method 2.

[0162] The base station designates a specific C-ID pair / group based on the UE's UE Capability report, and the terminal reports the preferred CRI / SSBRI to the base station when performing UL transmission via the corresponding panel (based on the specific C-ID pair / group).

[0163] For example, the base station may assign / configure an STxMP capable C-ID pair / group to the terminal. The terminal may report the CRI / SSBRI for the STxMP capable C-ID pair / group to the base station. The terminal may also report a beam quality value (e.g., L1-RSRP, L1-SINR) for the CRI / SSBRI to the base station.

[0164] Method 2 has the advantage that it can use the already defined beam report format as it is, as long as the base station setting / instruction part for the C-ID pair / group is added.

[0165] In the above proposed operation, the following embodiments can be additionally applied: Reception / measurement of CRI / SSBRI reported by the terminal is performed based on the associated / specified C-ID. Reception / measurement of DL RS (CSI-RS / SSB) is performed based on the C-ID (or C-ID-based panel) specified by the base station.

[0166] Method 3

[0167] The base station may transmit a beam report-related configuration to the terminal. Here, the beam report-related configuration may include information for configuring / instructing that a CRI / SSBRI be selected only from an STxMP capable combination or an STxMP incapable combination. Based on the configuration / instruction, the terminal reports information about the STxMP-capable or STxMP-incapable CRI / SSBRI to the base station. Here, the terminal may also report beam quality values (e.g., L1-RSRP, L1-SINR) for the CRI / SSBRI to the base station.

[0168] Method 2 is a method in which the base station assigns a C-ID pair / group to the terminal, while Method 3 is a method in which a setting / instruction is introduced to report STxMP capable CRI(s) / SSBRI(s).

[0169] Method 3 also has the advantage that the existing beam report format can be used as is, as long as additional settings / instructions for the base station regarding beam reporting (e.g., settings / instructions to select CRI / SSBRI only from STxMP capable combinations) are added.

[0170] The following embodiments are considered for the operation of selecting / reporting CRI(s) / SSBRI(s) for each C-ID or panel in Method 1, Method 2, and / or Method 3. The base station may configure candidate resources for the selection of the CRI(s) / SSBRI(s) in the terminal.

[0171] The candidate resources may include candidate CSI-RS resources, SSB resources, and / or interference measurement resources (e.g., CSI-IM resources, NZ PCS-RS resources for interference measurement). The candidate resources may be configured in groups. For example, one or more resource groups may be configured, and each resource group may include the candidate resources.

[0172] Based on the configured candidate resources, the UE selects / determines a combination of RSs capable of STxMP as follows.

[0173] For example, a terminal can select one resource for each resource group. A terminal can select a combination of RSs across multiple resource groups. In this case, each resource group corresponds to a unit (e.g., TRP, panel) that can generate only one receive beam at a time from the base station's perspective.

[0174] For example, a terminal can select resources only within each resource group, where each resource group corresponds to a beam combination that allows simultaneous reception via multiple beams from the base station's perspective.

[0175] In one embodiment, two RS resource sets can be configured in Rel-17 beam group based reporting. Here, operations based on Method 1, Method 2, or Method 3 are performed. As an example, the terminal can report the C-ID corresponding to each RS resource set (Method 1). As an example, the base station can configure / assign the C-ID corresponding to each RS resource set to the terminal (Method 2). As an example, the terminal can select STxMP capable RS combinations within the same resource set or across two resource sets (e.g., one for each set) (Method 3).

[0176] In this specification, the "panel" corresponds to the "TRP" that receives the signal, and may correspond to a "beam RS (set)", a "CORESET pool", a "PUCCH / SRS resource group", etc.

[0177] In an implementation aspect, the operation of the base station / terminal according to the above-described embodiments (e.g., operation based on at least one of Method 1, Method 2, and / or Method 3) can be processed by the apparatus (e.g., 100, 200) of FIG. 6 described below.

[0178] In addition, the operation of the base station / terminal according to the above-described embodiments (e.g., operation based on at least one of Method 1, Method 2, and / or Method 3) may be stored in a memory (e.g., 140, 240 in FIG. 6) in the form of instructions / programs (e.g., instructions, executable code) for driving at least one processor (e.g., 110, 210 in FIG. 6).

[0179] The signaling procedure according to the above embodiment will now be described in detail with reference to FIG.

[0180] FIG. 3 illustrates a signaling procedure according to an embodiment of the present disclosure.

[0181] Specifically, FIG. 3 shows 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, and Method 3).

[0182] Here, the UE / BS are merely examples, and various devices may be substituted. Figure 3 is merely for convenience of explanation and does not limit the scope of this specification. Also, some step(s) shown in Figure 3 may be omitted depending on the situation and / or settings.

[0183] It is assumed that the UE and / or BS in Figure 3 support multi-panel / TRP, and the TRP / panel may be a unit consisting of one or more antenna(s), antenna port(s), beam(s), and uplink / downlink RS / channel resource(s) of the UE.

[0184] For example, an uplink transmission panel can be identified based on a source RS (e.g., UL TCI, spatial relation) for an uplink channel / RS, and a downlink transmission TRP can be identified based on a source RS (e.g., DL TCI, QCL RS) for a downlink channel / RS. Specifically, they can be identified based on a unit having a specific UL / DL resource set / group (ID) or a specific (panel-related) ID as a source RS.

[0185] The UE reports UE capability information to the BS (S305). The UE capability information includes report information for the C-ID(s) as described above, and the corresponding UE capability value may include information regarding the maximum number of SRS ports that can be supported.

[0186] The UE receives beam and panel reporting-related configuration from the BS (S310). The configuration may include information on the number of CRI(s) / SSBRI(s) to report, measurement values to report (e.g., whether to report L1-RSRP or L1-SINR), report type information (e.g., whether to report an aperiodic report, a semi-persistent report on PUSCH, a semi-persistent report on PUCCH, or a periodic report), information on the reporting period and time point (e.g., periodicity, slot offset, etc.), and an indicator for reporting including a C-ID. Furthermore, the configuration may include a beam / panel reporting method to which the proposed method of this specification is applied.

[0187] After the beam and panel report related setting (S310), the base station sends a separate reporting triggering / activation instruction (for semi-persistent or aperiodic reports) to the terminal (S315).

[0188] A terminal that receives the beam and panel report related configuration (S310) (and the related triggering / activation message (S315)) performs the beam and panel related report periodically / non-periodically according to the configuration (and triggering / activation instruction) (S320). The report information may include not only CRI(s) / SSBRI(s) and L1-RSRP(s) / L1-SINR(s), but also C-ID(s) (for each CRI / SSBRI). In the beam / panel reporting operation, the proposed methods of this specification (e.g., Method 1, Method 2, Method 3) can be applied.

[0189] As mentioned above, the above BS / UE signaling and operations can be realized by the devices described below (devices 100 and 200 in FIG. 6). For example, the BS (e.g., TRP1 / TRP2) corresponds to the first wireless device 100, and the UE corresponds to the second wireless device 200, or vice versa in some cases.

[0190] For example, the aforementioned BS / UE signaling and operations may be processed by one or more processors 110, 210 of FIG. 6, and the aforementioned BS / UE signaling and operations may be stored in memory (140, 240 of FIG. 6) in the form of instructions / programs (e.g., instructions, executable code) for driving at least one processor 110, 210 of FIG. 6.

[0191] Hereinafter, the above-described embodiments will be described in detail from the viewpoint of the operation of a terminal and a base station with reference to Figures 4 and 5. The methods described below are merely categorized for the convenience of explanation, and it goes without saying that some components of any one method can be substituted for some components of another method or can be combined with each other and applied.

[0192] FIG. 4 is a flowchart illustrating a method performed by a terminal according to an embodiment of the present specification.

[0193] As shown in FIG. 4, the method performed by a terminal in a wireless communication system according to an embodiment of this specification includes a configuration information receiving step (S410), a DL RS receiving step (S420), a CSI calculation step (S430), and a CSI reporting step (S440).

[0194] At S410, the terminal receives configuration information related to channel state information (CSI) from the base station, which may include information based on at least one of the above-described methods 1, 2, and / or 3.

[0195] The configuration information may include at least one of i) CSI-IM (interference management) resource-related information, ii) CSI measurement configuration-related information, iii) CSI resource configuration-related information, iv) CSI-RS resource-related information, and v) CSI report configuration-related information, where at least one of i) to v) may include information based on at least one of Method 1, Method 2, and / or Method 3 described above.

[0196] For example, the configuration information may be based on CSI report configuration related information (e.g., CSI-ReportConfig IE), which may include Proposal 1 reporting configuration (e.g., settings / parameters related to group based beam reporting).

[0197] According to one embodiment, the configuration information may include information regarding group based beam reporting (e.g., groupBasedBeamReporting parameters). This embodiment may be based on Method 1. As an example, a type of resource indicator to be reported by the terminal is determined based on the information regarding group based beam reporting.

[0198] According to one embodiment, the configuration information may include a report quantity associated with the CSI.

[0199] As an example, the report 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'.

[0200] Based on the "report quantity", the CSI may include at least one of: 1) a Channel Quality Indicator (CQI), 2) a Precoding Matrix Indicator (PMI), 3) a CSI-RS Resource Indicator (CRI), 4) an SSB Resource Block Indicator (SSBRI), 5) a Layer Indicator (LI), 6) a Rank Indicator (RI), 7) a Layer 1-Reference Signal Received Strength (L1-RSRP), 8) a Layer 1-signal to noise and interference ratio (L1-SINR), and / or 9) a Capability Index or Index (an index of a UE Capability value set).

[0201] One or more parameters based on each of 1) to 9) may be included in the CSI. For example, one or more CRIs may be included in the CSI based on 3). For example, one or more CRIs, one or more SSBRIs, and one or more indexes may be included in the CSI based on 3), 4), and 9).

[0202] Here, the report quantity may be set to report parameter(s) related to group-based beam reporting. Specifically, the report quantity may be set to i) 'cri' - 'RSRP (Reference Signal Received Power)', ii) 'ssb-Index' - 'RSRP', iii) 'cri' - 'RSRP' - 'Index', or iv) 'ssb-Index' - 'RSRP' - 'Index'. The cri is a CSI-RS resource indicator (CRI). The ssb-Index is an SSB resource indicator (SS / PBCH Block (SSB) Resource Indicator (SSBRI). The Index is an index of a UE capability value set. The maximum supported number of SRS antenna ports is indicated based on the index of the UE capability value set.

[0203] At S420, the terminal receives at least one Downlink Reference Signal (DL RS) from the base station.

[0204] The at least one DL RS is based on a Synchronization Signal / Physical Broadcast Channel block (SS / PBCH block) (SSB) and / or a Channel State Information-Reference Signal (CSI-RS).

[0205] As an example, the at least one DL RS may include a CSI-RS and / or an SSB based on the two CSI resource sets described above.

[0206] At S430, the terminal calculates the CSI based on measurements for the at least one DL RS.

[0207] Parameter(s) included in the CSI may be determined / calculated based on measurements for the at least one DL RS. The parameter(s) included in the CSI may be parameter(s) based on the “report quantity.”

[0208] At S440, the terminal reports the CSI to the base station.

[0209] The CSI reporting may be periodic, semi-persistent, or aperiodic.

[0210] The CSI may be transmitted on a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).

[0211] Periodic CSI reporting is performed on the short PUCCH or long PUCCH. Semi-persistent (SP) CSI reporting is performed on the short PUCCH, long PUCCH, or PUSCH. Aperiodic CSI reporting is performed on the PUSCH and is triggered by DCI. In this case, information regarding the trigger for aperiodic CSI reporting may be conveyed / indicated / configured via MAC-CE.

[0212] Depending on the base station configuration of Method 1, beam pairs capable of STxMP ("beam pairs capable of simultaneous reception and transmission" or "beam pairs capable of simultaneous transmission") can be reported. The beam pairs can be reported for each group among one or more groups. The beam pairs in each group are based on two CRIs or two SSBRIs. An embodiment related to this will be described in detail below.

[0213] According to one embodiment, the CSI may include a resource indicator associated with each of one or more groups. This embodiment may be based on Method 1. In this case, the CSI may further include an index of the UE capability value set. A reporting instance associated with the resource indicator and a reporting instance associated with an index of the UE capability value set may be the same or different.

[0214] For example, the number of the one or more groups (e.g., 1, 2, 3, or 4) may be set based on the configuration information. Specifically, the number of the one or more groups may be determined based on an nrofReportedGroups parameter included in the configuration information. The nrofReportedGroups parameter indicates the number of (resource) groups reported per CSI-report.

[0215] For example, the resource indicator may be reported based on a first reporting instance (e.g., a first CSI report), and the index of the UE capability value set may be reported based on a second reporting instance (e.g., a second CSI report). The CSI may include CSI field(s) associated with the first reporting instance and CSI field(s) associated with the second reporting instance.

[0216] For example, the resource indicator and the UE capability value set may be based on a reporting instance having the same index, and the CSI may include CSI field(s) associated with the same reporting instance.

[0217] According to one embodiment, the resource indicators relate to simultaneous transmissions by the terminals based on spatial filters, which may refer to uplink transmit spatial filters (UL Tx spatial filters).

[0218] According to one embodiment, the resource indicators may include i) two CRIs or ii) two SSBRIs.

[0219] The resource indicator may be a resource indicator related to simultaneous reception and simultaneous transmission by a terminal, or a resource indicator related to simultaneous transmission by a terminal.

[0220] For example, the CSI-RS resources and / or SSB resources of each group may be applied to the simultaneous transmission. In other words, when a terminal performs uplink transmission based on a spatial filter, the CSI-RS resources and / or SSB resources of each group may be applied. According to one embodiment, the spatial filter (or uplink transmission spatial filter) may be determined based on the CSI-RS resources and / or SSB resources of each group. The determined spatial filters may be applied simultaneously.

[0221] For example, the CSI-RS resources and / or SSB resources of each group may be simultaneously received by the terminal. Specifically, CSI-RS and / or SSB based on the CSI-RS resources and / or SSB resources of each group may be simultaneously received by the terminal. According to one embodiment, beam pairs (or spatial domain receive filters) that can be simultaneously received by the terminal may be determined based on the CSI-RS resources and / or SSB resources of each group.

[0222] According to one embodiment, the simultaneous transmission may be performed based on UE capability, which may be related to the maximum supported number of SRS antenna ports.

[0223] According to one embodiment, based on information regarding the group based beam reporting, the CSI including a first resource indicator or a second resource indicator associated with each group can be reported.

[0224] The resources based on the first resource indicator (e.g., two CSI-RS resources or two SSB resources) may be simultaneously received by the terminal and applied to the simultaneous transmission.

[0225] Resources based on the second resource indicator may be applied to the simultaneous transmission.

[0226] Here, the information regarding group based beam reporting (e.g., groupBasedBeamReporting parameter) may indicate a first value associated with reporting the first resource indicator (e.g., JointULandDL) or a second value associated with reporting the second resource indicator (e.g., ULOnly).

[0227] For example, when the groupBasedBeamReporting parameter is set to a first value (e.g., JointULandDL), the terminal reports CSI including the first resource indicator. For example, when the groupBasedBeamReporting parameter is set to a second value (e.g., ULOnly), the terminal reports CSI including the second resource indicator.

[0228] According to one embodiment, the resource indicator may be based on two resource indicators, based on which one CSI-RS or one SSB is selected from each of two CSI resource sets.

[0229] The operations based on S410 to S440 described above may be implemented by the apparatus of Figure 6. For example, terminal 200 may control one or more transceivers 230 and / or one or more memories 240 to perform the operations based on S410 to S440.

[0230] The above-described embodiment will now be described in detail from the perspective of base station operation.

[0231] S510 to S530 described below correspond to S410 to S440 described in FIG. 4. In consideration of the correspondence, duplicated descriptions will be omitted. That is, specific descriptions regarding the operations of the base station described below can be replaced with the descriptions / embodiments of FIG. 4 corresponding to the corresponding operations. As an example, the descriptions / embodiments of S410 to S420 in FIG. 4 can also be applied to the base station operations of S510 to S520 described below. As an example, the descriptions / embodiments of S430 to S440 in FIG. 4 can also be applied to the base station operations of S530 described below.

[0232] FIG. 5 is a flowchart illustrating a method performed by a base station according to another embodiment of the present specification.

[0233] As shown in FIG. 5, a method performed by a base station in a wireless communication system according to another embodiment of this specification includes a configuration information transmitting step (S510), a DL RS transmitting step (S520), and a CSI receiving step (S530).

[0234] In S510, the base station transmits configuration information related to channel state information (CSI) to the terminal.

[0235] At S520, the base station transmits at least one Downlink Reference Signal (DL RS) to the terminal.

[0236] At S530, the base station receives the CSI from the terminal, where the CSI is calculated based on measurements of the terminal for the at least one DL RS.

[0237] The operations based on S510 to S530 described above may be implemented by the apparatus of Figure 6. For example, the base station 100 may control one or more transceivers 130 and / or one or more memories 140 to perform the operations based on S510 to S530.

[0238] An apparatus to which the embodiments of the present specification can be applied (an apparatus that implements the methods / operations according to the embodiments of the present specification) will be described below with reference to FIG.

[0239] FIG. 6 is a diagram illustrating the configuration of a first device and a second device according to an embodiment of the present specification.

[0240] The first device 100 may include a processor 110 , an antenna unit 120 , a transceiver 130 , and a memory 140 .

[0241] The processor 110 performs baseband-related signal processing and may include an upper layer processing unit 111 and a physical layer processing unit 115. The upper layer processing unit 111 may process operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 115 may process operations of the PHY layer. For example, when the first device 100 is a base station device in base station-terminal communication, the physical layer processing unit 115 may perform uplink reception signal processing, downlink transmission signal processing, etc. For example, when the first device 100 is a first terminal device in terminal-terminal communication, the physical layer processing unit 115 may perform downlink reception signal processing, uplink transmission signal processing, sidelink transmission signal processing, etc. In addition to performing baseband-related signal processing, the processor 110 may also control the overall operation of the first device 100.

[0242] The antenna unit 120 may include one or more physical antennas, and when multiple antennas are included, it may support MIMO transmission and reception. The transceiver 130 may include an RF (Radio Frequency) transmitter and an RF receiver. The memory 140 may store information processed by the processor 110, as well as software, an operating system, applications, etc. related to the operation of the first device 100, and may also include components such as buffers.

[0243] The processor 110 of the first device 100 can be configured to implement the operation of a base station in base station-terminal communication (or the operation of a first terminal device in terminal-terminal communication) in the embodiments described in this disclosure.

[0244] The second device 200 may include a processor 210 , an antenna unit 220 , a transceiver 230 , and a memory 240 .

[0245] The processor 210 performs baseband-related signal processing and may include an upper layer processing unit 211 and a physical layer processing unit 215. The upper layer processing unit 211 can process operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 215 can process operations of the PHY layer. For example, when the second device 200 is a terminal device in base station-terminal communication, the physical layer processing unit 215 can perform downlink reception signal processing, uplink transmission signal processing, etc. For example, when the second device 200 is a second terminal device in terminal-terminal communication, the physical layer processing unit 215 can perform downlink reception signal processing, uplink transmission signal processing, sidelink reception signal processing, etc. In addition to performing baseband-related signal processing, the processor 210 can also control the overall operation of the second device 200.

[0246] The antenna unit 220 may include one or more physical antennas, and when multiple antennas are included, it may support MIMO transmission and reception. The transceiver 230 may include an RF transmitter and an RF receiver. The memory 240 may store information processed by the processor 210, as well as software, an operating system, applications, etc. related to the operation of the second device 200, and may also include components such as buffers.

[0247] The processor 210 of the second device 200 may be configured to implement the operation of a terminal in base station-terminal communication (or the operation of a second terminal device in terminal-terminal communication) in the embodiments described in this disclosure.

[0248] In the operation of the first device 100 and the second device 200, the matters described in the examples of the present disclosure regarding the base station and terminal in base station-terminal communication (or the first terminal and second terminal in terminal-terminal communication) can be equally applied, and duplicate explanations will be omitted.

[0249] Here, the wireless communication technology implemented by the devices 100 and 200 of the present disclosure may include not only LTE, NR, and 6G, but also Narrowband Internet of Things (NB-IoT) for low-power communication. For example, the NB-IoT technology is an example of a Low Power Wide Area Network (LPWAN) technology, and can be implemented by standards such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the aforementioned names.

[0250] Additionally or alternatively, the wireless communication technology implemented in the devices 100 and 200 of the present disclosure may perform communication based on LTE-M technology. For example, LTE-M technology is an example of LPWAN technology and is referred to by various names such as enhanced machine type communication (eMTC). For example, LTE-M technology may be implemented by at least one of various standards such as 1) LTE CAT 0, 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, and is not limited to the above names.

[0251] Additionally or alternatively, the wireless communication technology implemented in the devices 100 and 200 of the present disclosure may include at least one of ZigBee (registered trademark), Bluetooth (registered trademark), and a Low Power Wide Area Network (LPWAN), which consider low-power communication, but is not limited to the aforementioned names. For example, ZigBee technology can create personal area networks (PANs) related to small / low-power digital communication based on various standards such as IEEE 802.15.4, and may be called by various names.

Claims

1. 1. A method performed by a terminal in a wireless communication system, comprising: receiving configuration information related to channel state information (CSI), the configuration information including information related to group-based beam reporting; receiving at least one Downlink-Reference Signal (DL RS); calculating the CSI based on measurements for the at least one DL RS; and reporting the CSI; The CSI includes a resource indicator associated with each group among one or more groups; The method, wherein the resource indicator is associated with simultaneous transmission by the terminal based on spatial filters.

2. The configuration information includes a report quantity associated with the CSI; 2. The method of claim 1, wherein the report quantity is set to i) 'cri'-'RSRP (Reference Signal Received Power)', ii) 'ssb-Index'-'RSRP', iii) 'cri'-'RSRP'-'Index', or iv) 'ssb-Index'-'RSRP'-'Index'.

3. The cri is a CSI-RS resource indicator (CRI), the ssb-Index is an SSB resource indicator (SS / PBCH block (SSB) Resource Indicator (SSBRI), The Index is an index of a UE capability value set, The method of claim 2, wherein a maximum supported number of SRS antenna ports is indicated based on an index of the terminal performance value set.

4. 4. The method of claim 3, wherein the resource indicators include i) two CRIs or ii) two SSBRIs.

5. The method of claim 4, wherein the CSI-RS resources and / or SSB resources of each group are applicable to the simultaneous transmission.

6. The method of claim 4, wherein the CSI-RS resources and / or SSB resources of each group can be simultaneously received by the terminal.

7. The method according to claim 3, wherein the simultaneous transmission is performed based on UE capability.

8. The method of claim 7 , wherein the terminal capability is related to the maximum supported number of SRS antenna ports.

9. The method of claim 3, wherein the CSI further includes an index of the UE capability value set.

10. The CSI including a first resource indicator or a second resource indicator associated with each group is reported based on information related to the group-based beam reporting; The resources based on the first resource indicator may be simultaneously received by the terminal and may apply to the simultaneous transmission; The method of claim 1 , wherein resources based on the second resource indicator are applicable to the simultaneous transmissions.

11. 11. The method of claim 10, wherein the information related to group-based beam reporting indicates a first value associated with reporting the first resource indicator or a second value associated with reporting the second resource indicator.

12. the resource indicator is based on two resource indicators; The method of claim 1 , wherein one CSI-RS or one SSB is selected from each of two CSI resource sets based on the two resource indicators.

13. 1. A terminal operating in a wireless communication system, comprising: one or more transceivers; one or more processors; and one or more memories operably connected to the one or more processors and storing instructions that, when executed by the one or more processors, configure the one or more processors to perform operations; The operation is receiving configuration information related to channel state information (CSI), the configuration information including information related to group-based beam reporting; receiving at least one Downlink-Reference Signal (DL RS); calculating the CSI based on measurements for the at least one DL RS; and reporting the CSI; The CSI includes information regarding a resource indicator associated with each group among one or more groups; The terminal, wherein the resource indicator is associated with simultaneous transmission based on spatial filters by the terminal.

14. 1. An apparatus comprising: one or more memories and one or more processors operatively connected to said one or more memories, the one or more memories include instructions that, when executed by the one or more processors, configure the one or more processors to perform operations; The operation is receiving configuration information related to channel state information (CSI), the configuration information including information related to group-based beam reporting; receiving at least one Downlink-Reference Signal (DL RS); calculating the CSI based on measurements for the at least one DL RS; and reporting the CSI; The CSI includes information regarding a resource indicator associated with each group among one or more groups; The apparatus, wherein the resource indicator is associated with simultaneous transmission based on spatial filters by a terminal.

15. one or more non-transitory computer-readable media carrying one or more instruction words, one or more instructions executable by one or more processors to configure the one or more processors to perform an operation; The operation is receiving configuration information related to channel state information (CSI), the configuration information including information related to group-based beam reporting; receiving at least one Downlink-Reference Signal (DL RS); calculating the CSI based on measurements for the at least one DL RS; and reporting the CSI; The CSI includes information regarding a resource indicator associated with each group among one or more groups; One or more non-transitory computer-readable media, wherein the resource indicators are associated with simultaneous transmission based on spatial filters by terminals.

16. 1. A method performed by a base station in a wireless communication system, comprising: transmitting configuration information related to channel state information (CSI), the configuration information including information related to group-based beam reporting; transmitting at least one Downlink-Reference Signal (DL RS); and receiving the CSI; The CSI is calculated based on measurements of the terminal with respect to the at least one DL RS; The CSI includes information regarding a resource indicator associated with each group among one or more groups; The method, wherein the resource indicator is associated with simultaneous transmission by the terminal based on spatial filters.

17. 1. A base station operating in a wireless communication system, comprising: one or more transceivers; one or more processors; and one or more memories operably connected to the one or more processors and storing instructions that, upon being executed by the one or more processors, configure the one or more processors to perform operations; The operation is transmitting configuration information related to channel state information (CSI), the configuration information including information related to group-based beam reporting; transmitting at least one Downlink-Reference Signal (DL RS); and receiving the CSI; The CSI is calculated based on measurements of the terminal with respect to the at least one DL RS; The CSI includes information regarding a resource indicator associated with each group among one or more groups; The base station, wherein the resource indicator is related to simultaneous transmission based on spatial filters by the terminals.

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