Method and apparatus for beam reporting in wireless communication systems

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] This specification relates to a method and apparatus for beam reporting in a wireless communication system.

Background Art

[0002] Mobile communication systems were developed to provide voice services while ensuring user mobility. However, mobile communication systems have expanded their scope to include not only voice but also data services, and currently, the explosive growth of traffic has led to a shortage of resources, 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 and must support accommodating explosive data traffic, a revolutionary increase in the transmission rate per user, accommodating a significantly increased number of connected devices, very low end-to-end latency, and high energy efficiency. Therefore, various technologies such as dual connectivity, massive multiple input multiple output (Massive MIMO), in-band full duplex, non-orthogonal multiple access (NOMA), super wideband support, and device networking are being studied.

[0004] Rel-17 MIMO introduced panel-specific beam reporting, an improvement over conventional beam reporting methods. Specifically, the UE capability (set) Index corresponding to the terminal panel or panel type is reported together, and this information can be used to support UL / DL panel selection for the terminal. However, the information reported by existing panel-specific beam reporting does not take into account simultaneous transmission across multiple panels (STxMP) for the terminal in question. [Overview of the project] [Problems that the invention aims to solve]

[0005] As mentioned above, STxMP is not considered in the information reported by existing panel-specific beam reports. It is not possible to determine whether or not a terminal supports STxMP based on the reported information (e.g., CRI, SSBRI).

[0006] In other words, according to existing beam reporting methods, terminals cannot report beam information (e.g., CRI, SSBRI) that is supported by STxMP to the base station. Therefore, operation based on beam information (e.g., CRI, SSBRI) that is supported by STxMP cannot be supported.

[0007] The purpose of this specification is to propose a method for reporting beams (e.g., CRI(et al.) and / or SSBRI(et al.)) that are supported for simultaneous transmission by a terminal.

[0008] The technical problems that this specification seeks to solve are not limited to those mentioned above, and another technical problem not mentioned can be clearly understood by a person skilled in the art to which this invention pertains from the following description. [Means for solving the problem]

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

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

[0011] The CSI includes a Resource Indicator associated with each of one or more groups. The Resource Indicator is characterized by being associated with simultaneous transmission based on spatial filters by the terminal.

[0012] The aforementioned configuration information may include the report quantity related to 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 aforementioned cri is a CSI-RS resource indicator (CRI-RS resource indicator, CRI), and the aforementioned ssb-Index is an SSB resource indicator (SS / PBCH block (SSB) resource indicator, SSBRI).

[0015] The aforementioned Index may also be an index of the UE capability value set.

[0016] The maximum number of SRS antenna ports may be indicated based on the index of the aforementioned 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 of the aforementioned groups may be applied to the simultaneous transmission.

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

[0020] The aforementioned simultaneous transmission may be performed based on the terminal performance (UE capability).

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

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

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

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

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

[0026] The information related to the group based beam reporting indicates a first value related to the reporting of the first resource indicator or a second value related to the reporting of the second resource indicator.

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

[0028] A terminal operating in a wireless communication system according to other embodiments 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 for setting 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 on the at least one DL RS, and reporting the CSI.

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

[0031] The CSI includes a Resource Indicator associated with each of one or more groups. The Resource Indicator is characterized by being associated with simultaneous transmission based on spatial filters by the terminal.

[0032] Apparatus according to other embodiments of this specification include one or more memories and one or more processors functionally coupled to the one or more memories.

[0033] The one or more memory units include instructions that configure the one or more processors to operate, based on the fact that they are to be executed by the one or more processors.

[0034] The operation includes the steps of receiving configuration information related to channel state information (CSI), receiving at least one down link reference signal (DL RS), calculating the CSI based on a measurement of the at least one DL RS, and reporting the CSI.

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

[0036] The CSI includes a Resource Indicator associated with each of one or more groups. The Resource Indicator is characterized by being associated with simultaneous transmission based on spatial filters by the terminal.

[0037] One or more non-transitory computer-readable media according to other embodiments of this specification store one or more instruction words.

[0038] One or more instruction words that can be executed by one or more processors are set to be executed by the one or more processors.

[0039] The operation includes the steps of receiving configuration information related to channel state information (CSI), receiving at least one downlink reference signal (DL RS), calculating the CSI based on a measurement of the at least one DL RS, and reporting the CSI.

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

[0041] The CSI includes resource indicators associated with each of one or more groups. The resource indicators are characterized by being associated with simultaneous transmission based on spatial filters by the terminal.

[0042] A method performed by a base station in a wireless communication system according to another embodiment of this specification 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. The CSI is calculated based on terminal measurements for at least one DL RS.

[0044] The CSI includes information about resource indicators associated with each of one or more groups. The resource indicators are characterized by being associated with simultaneous transmission based on spatial filters by the terminal.

[0045] A base station operating in a wireless communication system according to another embodiment of this specification includes one or more transceivers, one or more processors, and one or more memories operably connectable to the one or more processors and storing instructions that configure the one or more processors to operate based on that instructions are to be executed by the one or more processors.

[0046] The operation 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.

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

[0048] The CSI includes information about resource indicators associated with each of one or more groups. The resource indicators are characterized by being associated with simultaneous transmission based on spatial filters by the terminal. [Effects of the Invention]

[0049] According to embodiments of this specification, resource indicators related to simultaneous transmission by terminals are reported based on a group-based beam reporting scheme.

[0050] Since it is possible to determine whether the terminal in question supports STxMP based on the reported resource indicator, UL scheduling / UL transmission based on beams that support STxMP can be performed after the reporting operation.

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

[0052] The effects described herein are not limited to those mentioned above, and other effects not mentioned above will be clearly understood by those skilled in the art to which the present invention pertains from the following description. [Brief explanation of the drawing]

[0053] [Figure 1] This shows an example of beamforming using SSB and CSI-RS. [Figure 2] A flowchart illustrating an example of a DL BM procedure using SSB. [Figure 3] An example of a signaling procedure according to an embodiment of this specification is provided. [Figure 4]This is a flowchart illustrating a method performed by a terminal according to one embodiment of this specification. [Figure 5] This is a flowchart illustrating a method performed by a base station according to other embodiments of this specification. [Figure 6] This figure shows the configurations of the first and second apparatus according to embodiments of this specification. [Modes for carrying out the invention]

[0054] Preferred embodiments of the present invention will be described in detail below 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 not to show only the embodiments in which the invention can be carried out. The following detailed description includes specific details in order to provide a complete understanding of the invention. However, those skilled in the art will see that the invention can be carried out without such specific details.

[0055] In some cases, known structures and devices may be omitted or shown in the form of block diagrams focusing on the core function of each structure and device, in order to avoid ambiguity of the concept of the present invention.

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

[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 beamforming signal received.

[0060] - Beam determination: The process by which a base station or UE selects its transmit beam (Tx beam) and receive beam (Rx beam).

[0061] - Beam sweeping: An operation that uses transmitted and / or received beams to cover a spatial area at regular time intervals in a predetermined manner.

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

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

[0064] Furthermore, each BM procedure includes Tx beam sweeping to determine the Tx beam and Rx beam sweeping to determine the Rx beam.

[0065] DL BM

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

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

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

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

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

[0071] Rx beam sweeping using SSBs can be performed across multiple SSB bursts (across) the same SSBRI while the UE modifies the Rx beam. Here, one SS burst contains one or more SSBs, and one SS burst set contains one or more SSB bursts.

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

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

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

[0075] Table 1 shows an example of CSI-ResourceConfig IE. As shown in Table 1, BM configuration using SSB is not defined separately; 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 a single CSI-RS resource set. Here, the SSB resource set may be configured as {SSBx1, SSBx2, SSBx3, SSBx4,…}. For example, the SSB index may be defined from 0 to 63.

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

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

[0080] In other words, when the reportQuantity of the CSI-ReportConfig IE is set to "ssb-Index-RSRP", the terminal reports the best SSBRI and its corresponding L1-RSRP to the base station.

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

[0082] Here, the aforementioned QCL Type D may mean that QCL is in place between antenna ports from the perspective of the spatial Rx parameter. When a terminal receives multiple DL antenna ports that are in a QCL Type D relationship, it may apply the same receive beam. Also, the terminal does not expect CSI-RS to be set at REs that overlap with SSB REs.

[0083] BM enhancements in NR Rel-16

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

[0085] This design approach ultimately resulted in significant signaling overhead and high beam change latency for numerous terminals communicating with the base station using a single beam, as the base station had to issue beam change instructions to each terminal for each channel / RS resource in order to change the serving beam. Along with the UL beam change, UL power control-related parameters, particularly pathloss RS (PL RS), also had to be changed for each UL channel / RS, leading to further signaling overhead and latency issues. To compensate for these shortcomings, five features were introduced in Rel-16. Table 2 illustrates these five features.

[0086] [Table 2-1]

[0087] [Table 2-2]

[0088] In Rel-16, not only were there enhancements related to beam / PL RS indication as described above, but also enhancements related to beam reporting. In Rel-15, a mode was supported in which the terminal measured and reported the L1-RSRP for each beam RS. However, in environments with high inter-beam interference, it is difficult to guarantee that a particular beam RS has excellent quality as a serving beam simply because its L1-RSRP, i.e., the received intensity, is high. In other words, the terminal can select a beam with high received intensity but also high beam interference and report it to the base station. To overcome this drawback, Rel-16 newly supports a beam reporting mode in which the base station sets not only channel measurement RSs but also interference measurement resources, and the terminal measures the L1-SINR for the relevant channel resource and interference resource based on this and reports several RSs with high L1-SINR values.

[0089] BM enhancements in NR Rel-17

[0090] As mentioned earlier, various BM enhancements were implemented in Rel-16. In particular, a feature was created that significantly reduced signaling overhead / latency related to the beam direction method. However, it was still not possible to set / direct the beam in a channel / RS integrated manner for terminals operating with a single serving beam.

[0091] Based on this motivation, Rel-17 plans to standardize a channel / RS integrated beam configuration / indication method. In NR, DL beams are indicated via TCI (transmit configuration indicator), so this will be named the unified TCI state. While existing TCI states are set / indicated separately for each DL RS / channel, the unified TCI state is characterized by its integrated setting / indication. Basically, the DL unified TCI state indicates the QCL type-D RS which is integrated and applied to (some) PDCCH, PDSCH, and (some) CSI-RS resources, and the UL unified TCI state indicates the spatial relation RS (and PL RS) which is integrated and applied to (some) PUCCH, PUSCH, and (some) SRS resources. Also, similar to the Rel-16 default spatial relation / PL RS feature, the UL spatial relation and PL RS can be matched to the DL beam RS for terminals where beam correspondence is established, so the channels / RS to which the unified TCI state is applied can cover both DL and UL channels / RS. 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 setting / instruction mode: The DL RS set / instructed to the Joint TCI state is applied not only as the QCL type-D source RS for the DL channel / RS, but also as the spatial relation RS (and PL RS) for the UL channel / RS. In other words, 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 setting / instruction mode: QCL type-D source RS for DL ​​channel / RS is integrated into the DL TCI state setting / instruction, and spatial relation RS (and PL RS) for UL channel / RS is integrated into the UL TCI state setting / instruction. Here, the DL TCI state and UL TCI state are set / instructed separately.

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

[0095] Such DCI instructions will be supported via the downlink DCI format (DCI1-1 / 1-2) which supports the TCI field, and will be supported both 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), terminal ACK transmission to the relevant DCI will be supported.

[0096] Enhancements related to beam reporting are planned for Rel-17. The Rel-17 beam report mode will support a mode in which the terminal measures and reports the optimal beam RS for each TRP, targeting multi-TRP environments. To this end, the base station will configure the beam measurement RS set / group to be divided 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 that RS (L1-RSRP, [L1-SINR]).

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

[0098] In this specification, QCL type-D RS, TCI state, or simply TCI may mean a spatial parameter, i.e., the QCL reference RS from a beam perspective. The QCL reference RS may be interpreted as an extended reference RS or source RS for the parameter in question or other beam / space-related parameters.

[0099] In this specification, “beam” may mean 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] For example, beams associated with UL may be referred to as i) spatial filters (for uplink transmission or uplink reception), ii) spatial domain filters (for uplink transmission or uplink reception), iii) uplink spatial domain transmission filters, iv) uplink spatial domain receive filters, v) uplink transmission spatial filters (UL Tx spatial filters), or vi) uplink reception spatial filters (UL Rx spatial filters).

[0101] For example, beams associated with DL may be referred to as i) spatial filters (for downlink transmission or downlink reception), ii) spatial domain filters (for downlink transmission or downlink reception), iii) downlink spatial domain transmission filters, iv) downlink spatial domain receive filters, v) downlink transmission spatial filters (DL Tx spatial filters), or vi) downlink reception spatial filters (DL Rx spatial filters).

[0102] For example, if beam reciprocity holds, the DL beam and UL beam may be similarly referred to as spatial filters or spatial domain filters. Specifically, if beam reciprocity holds, a particular UL beam may be identical to a particular DL beam. For example, the UL beam used for uplink transmission at a terminal can be determined based on measurements of the DL beam used for transmission at a base station. For example, the DL beam used for downlink transmission at a base station can be determined based on measurements of the UL beam used for transmission at a terminal.

[0103] Furthermore, the designation of QCL type-D RS may be omitted in environments where analog beamforming is not used, such as in the low-frequency band. In such cases, QCL type-D RS as used herein may be interpreted as QCL reference RS (i.e., if only one reference RS exists in the TCI state, it can refer to that RS).

[0104] Furthermore, from a UL perspective, the TCI state (or simply TCI) may also refer to the reference / source RS for the UL beam. From the aforementioned UL perspective, the TCI state may also refer to the existing spatial relation RS (and pathloss RS) in Rel-15 / 16. Here, the pathloss RS may be the same as the RS in question, or it may be set in relation to or separately from the UL TCI state.

[0105] In Rel-17 MIMO, the beam reporting method supported in existing releases 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 that utilizes this to support the selection of uplink (UL) (and downlink, DL) panels for terminals. Hereafter, for convenience, this method will be referred to as panel-specific beam reporting.

[0106] This method assumes that, in order to support rapid changes in terminal panels, the terminal uses one panel at a time to perform UL transmission. The aforementioned 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 denoted as "Capability[Set]Index". However, this name "Capability[Set]Index" is for explanatory purposes only, and "UE Capability (set) index" may be called by other terms (e.g., Index).

[0107] In the following, for convenience of description, the index in question ("UE Capability (set) index") will be referred to as "C-ID". A terminal can report to the base station how many C-IDs it has 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). In other words, Rel-17 C-IDs are defined only for panels with different numbers of SRS ports.

[0109] For example, we may assume that a 4-panel UE is configured with panel#0 (2 ports), panel#1 (2 ports), panel#2 (4 ports), and panel#3 (4 ports). Here, 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 as C-ID#0 with max supported SRS ports=2, C-ID#1 with max supported SRS ports=4. Based on this, the C-ID and its associated UE Capability information (e.g., maximum number of SRS ports) can be understood as a report for a type of panel.

[0111] Table 3 below shows that panel-specific beam reports include the C-ID reported as UE Capability in the beam report (instantaneously / periodically).

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

[0113] When a panel-specific beam report is set / instructed, the terminal operates as follows: The terminal reports to the base station the optimal C-ID for each CRI / SSBRI(et al.), along with the L1-RSRP / L1-SINR(et al.) associated with the CRI / SSBRI(et al.). 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. In this example, the four CRIs reported by the terminal can be interpreted in relation to the terminal panel as follows:

[0114] The first two CRIs reported as C-ID#0 mean the following: When a 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 (or one of the corresponding panels) corresponding to C-ID#0, or 2) it is more advantageous to use the panel (or one of the corresponding panels) corresponding to C-ID#0 than to use 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] If the base station receives (and / or transmits) using a beam corresponding to one of the remaining two CRIs, then 1) the terminal prefers to transmit using the panel (or one of the corresponding panels) corresponding to C-ID#1, or 2) it is more advantageous to use the panel (or one of the corresponding panels) corresponding to C-ID#1 than to use the panel corresponding to the other 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 has been initiated on a method to support simultaneous transmission across multiple panels (STxMP) in the Rel-18 MIMO work item. This specification proposes a method for extending the Rel-17 panel-specific beam report to support / consider STxMP.

[0122] Prioritizing this, C-IDs can be extended to represent other terminal panel (type) attributes besides the maximum number of SRS ports. This allows for the assignment of different C-IDs to panels that support the same maximum number of SRS ports. This is because STxMP can be supported even for panels with the same number of UL ports. Additionally, combinations of C-IDs that are and / or not STxMP capable can be reported to the base station. For example, a terminal can configure and report STxMP capable and / or incapable C-ID pairs. Such terminal reports allow the base station to determine which C-IDs correspond to which CRI / SSBRIs are STxMP capable (or not) when used as the UL TCI (or spatial relation).

[0123] In conjunction with or as an alternative to the method described above, 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) that are and / or are not capable of STxMP during panel-specific beam reporting, along with information about C-ID (or C-ID pair / group).

[0126] As an example, a base station can request / configure a terminal to report beams for STxMP-capable panels. Such a request allows 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 report i) and / or ii) together.

[0127] i) CRI(la) / SSBRI(la) and / or ii) Beam quality values ​​associated with the relevant CRI(la) / SSBRI(la) (e.g., L1-RSRP, L1-SINR)

[0128] The CRI(et al.) / SSBRI(et al.) in i) above may be a CRI / SSBRI preferred by the terminal to be applied as UL TCI (or spatial relation RS). That is, the CRI / SSBRI(et al.) can be applied as UL TCI (or spatial relation RS) to the panel based on the STxMP capable C-ID.

[0129] As another example, a base station can request / configure a terminal to report beam reports along with information regarding the availability of STxMP. This "availability of STxMP" may be reported via a separate indicator or implicitly as grouping information for CRI / SSBRI and / or C-ID.

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

[0131] If N=4 and beam RS type=CSI-RS, the terminal can report according to Method 1 as shown in Examples 1 through 4 below.

[0132] Example 1) The 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 divide the four CRIs and four C-IDs into two groups and report them 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) The 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, a C-ID pair means an STxMP capable or STxMP incapable C-ID, or an index may be assigned separately to the pair.

[0141] In Example 2, CRI / C-IDs belonging to the same group may indicate that they are either 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 pre-configured by the base station. For example, a combination of CSI-RS resources belonging to a CRI pair (candidate group) means a combination of beam RSs in which the base station can "simultaneously" receive the respective terminal transmit beams with the receive beam corresponding to the CSI-RS resource. In the implementation of the base station, the CRI pair corresponds to a combination of beams transmitted from different TRPs or from different panels of the same TRP.

[0143] For reference, the beam reporting methods supported by existing 3GPP NR standards can be divided into group-based beam reporting methods and non-group-based beam reporting methods, as shown below. In Rel-17, an evolved group-based reporting method was introduced to take into account simultaneous transmission of MTRP (groupBasedBeamReporting-r17).

[0144] Specifically, two CSI resource sets can be configured in Resource Setting. Each CSI resource set can be considered a collection of beam RSs transmitted from each TRP. For example, a terminal may receive information (e.g., CSI-AssociatedReportConfigInfo) that includes the first and second resource sets. Each resource set may be associated with CSI-RS or 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-Resource Set2) can be configured based on resourcesForChannel2.

[0145] A terminal that receives such reporting settings / instructions selects one resource (i.e., CRI or SSBRI) from each CSI resource set and reports resource pair information on a group basis. In other words, resource pairs belonging to the same group correspond to beam pairs that support simultaneous reception (and / or simultaneous transmission).

[0146] Method 1 can be extended to report not only "beam pairs capable of simultaneous reception" but also "beam pairs capable of simultaneous transmission." In other words, existing group-based beam reporting can also be performed for uplinks. Based on Method 1, the following embodiments can be considered.

[0147] According to one embodiment, depending on the reporting settings of the base station, the terminal can report a "simultaneously receivable and transmittable beam pair" or a "simultaneously transmittable beam pair." As a specific example, the reporting settings may include settings related to the group-based beam reporting. Based on the settings related to the group-based beam reporting (e.g., the groupBasedBeamReporting parameter), the terminal can report a CSI to the base station that includes information about a "simultaneously transmittable beam pair" or a "simultaneously receivable and transmittable beam pair."

[0148] For example, the groupBasedBeamReporting parameter may be set to a first or 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 regarding the aforementioned "simultaneously receivable and transmittable beam pair" or "simultaneously transmittable beam pair" is based on two CRIs (or two SSBRIs) from each of one or more groups.

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

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

[0152] The spatial filter may mean an uplink transmit spatial filter (UL Tx spatial filter). The spatial filter may be determined based on the two CRIs (or two SSBRIs).

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

[0154] [Table 4]

[0155] The aforementioned information regarding "beam pairs capable of simultaneous transmission" or "beam pairs capable of simultaneous reception and transmission" can be reported based on Table 5 below.

[0156] [Table 5]

[0157] Method 1 involves the terminal selecting / reporting a combination of STxMP panels and beams. Alternatively, a method is considered in which the base station configures / specifies a combination of STxMP panels or a group of candidate STxMP panels. The operations related to this will be specifically explained in Method 2 below.

[0158] Method 2

[0159] The base station can specify / set a particular C-ID pair / group for a terminal in the terminal's beam report. The particular C-ID pair / group may include i) STxMP capable pairs / groups and / or ii) STxMP incapable pairs / groups.

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

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

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

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

[0164] Method 2 has the advantage of being able to utilize the already defined beam report format as long as the base station configuration / instruction part for the C-ID pair / group is added.

[0165] In the proposed operation described above, the following embodiments may 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 can transmit settings related to beam reporting to the terminal. Here, the settings related to beam reporting may include information that configures / instructs that CRI / SSBRI be selected only from STxMP capable or STxMP incapable combinations. Based on the settings / instructions, the terminal reports to the base station information regarding CRI / SSBRI that is STxMP capable or STxMP incapable. Here, the terminal may also report to the base station beam quality values ​​(e.g., L1-RSRP, L1-SINR) for the CRI / SSBRI.

[0168] Method 2 involves the base station specifying the C-ID pair / group to the terminal. On the other hand, Method 3 involves introducing a setting / instruction to report STxMP capable CRI(etc.) / SSBRI(etc.).

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

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

[0172] Based on the configured candidate resources, the terminal selects / determines the following combination of RSs that can be STxMP-enabled:

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

[0174] For example, a terminal can only select resources within its own resource group. In this case, each resource group corresponds to a beam combination that can be simultaneously received 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. For example, the terminal can report the C-ID corresponding to each RS resource set (Method 1). For example, the base station can set / specify the C-ID corresponding to each RS resource set to the terminal (Method 2). For example, the terminal can select STxMP capable RS combinations within the same resource set or across two resource sets (e.g., one per set) (Method 3).

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

[0177] In practical terms, the operation of the base station / terminal according to the above-described embodiment (e.g., operation based on at least one of Method 1, Method 2, and / or Method 3) can be processed by the device shown in Figure 6 (e.g., 100, 200) described later.

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

[0179] The signaling procedure based on the above-described embodiment will be explained in detail below with reference to Figure 3.

[0180] Figure 3 illustrates a signaling procedure according to an embodiment of this specification.

[0181] Specifically, Figure 3 shows an example of signaling between UE (user equipment) and BS (base station) based on the proposed methods described above (e.g., Method 1, Method 2, Method 3).

[0182] Here, UE / BS is merely an example and can be substituted for a variety of other devices. Figure 3 is for illustrative purposes only and does not limit the scope of this specification. Also, some of the steps shown in Figure 3(e) may be omitted depending on the situation and / or settings.

[0183] In Figure 3, it is assumed that the UE and / or BS support multi-panel / TRP. The TRP / panel may also be a unit consisting of one or more antennas (a), antenna ports (a), beams (a), and up / downlink RS / channel resources (a) of the terminal.

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

[0185] The UE reports UE Capability information to the BS (S305). The UE Capability information includes the information reported to C-ID(et al.) as described above, and the 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 configurations from the BS (S310). These configurations may include an indicator for reporting with C-ID along with information on the number of CRIs / SSBRIs to report, the measurement values ​​to report (e.g., whether to report L1-RSRP or L1-SINR), the reporting type (e.g., whether to report an aperiodic report, a semi-persistent report on PUSCH, a semi-persistent report on PUCCH, or a periodic report), and information on the reporting cycle and timing (e.g., periodicity, slot offset). Furthermore, the configuration may include settings for the beam / panel reporting method to which the proposed method herein is applied.

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

[0188] Upon receiving the beam and panel reporting-related settings (S310) (and associated triggering / activation message (S315)), the terminal performs the beam and panel-related reporting periodically / aperiodicly according to the settings (and triggering / activation instructions) (S320). The reporting information may include not only CRI(et al.) / SSBRI(et al.) and L1-RSRP(et al.) / L1-SINR(et al.), but also C-ID(et al.) (for each CRI / SSBRI). The proposed methods of this specification (e.g., Method 1, Method 2, Method 3) can be applied to the beam / panel reporting operation.

[0189] As mentioned above, the BS / UE signaling and operation described can be realized by the devices described below (devices 100 and 200 in Figure 6). For example, the BS (e.g., TRP1 / TRP2) corresponds to the first radio device 100, and the UE corresponds to the second radio device 200, and in some cases the reverse may also be considered.

[0190] For example, the aforementioned BS / UE signaling and operation may be processed by one or more processors 110, 210 in Figure 6, and the aforementioned BS / UE signaling and operation may be stored in memory (140, 240 in Figure 6) in the form of instruction words / programs (e.g., instruction, executable code) to drive at least one of the processors 110, 210 in Figure 6.

[0191] The above-mentioned embodiments will now be described in detail from the perspective of the operation of the terminal and base station, with reference to Figures 4 and 5. The methods described below are separated only for the sake of explanation, and it goes without saying that some components of one method can be replaced with some components of another method, or they can be combined and applied together.

[0192] Figure 4 is a flowchart illustrating a method performed by a terminal according to one embodiment of this specification.

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

[0194] In S410, the terminal receives configuration information regarding Channel State Information (CSI) from the base station. This configuration information may include information based on at least one of the methods 1, 2, and / or 3 described above.

[0195] The configuration information may include at least one of the following: 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. In this case, at least one of i) through v) may include information based on at least one of the methods 1, 2, and / or 3 described above.

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

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

[0198] According to one embodiment, the setting information may include the report quantity related to 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 the following: 1) Channel Quality Indicator (CQI), 2) Precoding Matrix Indicator (PMI), 3) CRI (CSI-RS Resource Indicator), 4) SSBRI (SSB Resource Block Indicator), 5) LI (Layer Indicator), 6) Rank Indicator (RI), 7) Layer 1-Reference Signal Received Strength (L1-RSRP), 8) Layer 1-signal to noise and interference ratio (L1-SINR), and / or 9) Capability Index or Index (an index of UE Capability value set).

[0201] One or more parameters based on each of the above 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 parameters 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 in the UE Capability value set. The maximum supported number of SRS antenna ports is indicated based on the index in the UE Capability value set.

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

[0204] The aforementioned 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, at least one DL RS may include a CSI-RS and / or SSB based on the two CSI resource sets mentioned above.

[0206] In S430, the terminal calculates the CSI based on the measurement of at least one DL RS.

[0207] The parameters (etc.) included in the CSI can be determined / calculated based on measurements for at least one DL RS. The parameters (etc.) included in the CSI may be parameters (etc.) based on the "reportquantity".

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

[0209] The reporting of the aforementioned CSI can be periodic, semi-persistent, or aperiodic.

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

[0211] 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 is triggered by DCI. In this case, information regarding the trigger for aperiodic CSI reporting may be communicated / instructed / configured via MAC-CE.

[0212] Depending on the base station configuration in Method 1, STxMP-enabled beam pairs ("simultaneously receiveable and transmittable beam pairs" or "simultaneously transmittable beam pairs") can be reported. These beam pairs can be reported separately for each of one or more groups. Each group's beam pair is based on two CRIs or two SSBRIs. Embodiments related to this are described in detail below.

[0213] According to one embodiment, the CSI may include resource indicators associated with each of one or more groups. This embodiment can be based on Method 1. In this case, the CSI may further include an index of the UE Capability value set. The reporting instance associated with the resource indicator and the reporting instance associated with the 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 can be determined based on the 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., first CSI report), and the index of the UE Capability value set may be reported based on a second reporting instance (e.g., second CSI report). The CSI may include CSI fields related to the first reporting instance and CSI fields related to the second reporting instance.

[0216] For example, this can be done based on reporting instances where the resource indicator and the UE Capability value set index are the same. The CSI may include CSI fields related to the same reporting instance.

[0217] According to one embodiment, the resource indicator relates to simultaneous transmission by the terminal based on spatial filters. The spatial filters may refer to uplink transmission spatial filters (UL Tx spatial filters).

[0218] According to one embodiment, the resource indicator 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 the terminal, or a resource indicator related to simultaneous transmission by the terminal. A specific explanation follows.

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

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

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

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

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

[0225] The resources based on the second resource indicator can be applied to the simultaneous transmission.

[0226] Here, the information regarding the group-based beam reporting (e.g., the groupBasedBeamReporting parameter) may represent a first value related to the reporting of the first resource indicator (e.g., JointULandDL) or a second value related to the reporting of the second resource indicator (e.g., ULOnly).

[0227] For example, based on the setting of the groupBasedBeamReporting parameter to a first value (e.g., JointULandDL), the terminal reports a CSI including the first resource indicator. For example, based on the setting of the groupBasedBeamReporting parameter to a second value (e.g., ULOnly), the terminal reports a CSI including the second resource indicator.

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

[0229] The operations based on S410 to S440 described above can be realized by the device shown in Figure 6. For example, terminal 200 can control one or more transceivers 230 and / or one or more memories 240 to perform operations based on S410 to S440.

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

[0231] The S510 to S530 described later correspond to the S410 to S440 described in Figure 4. Taking this correspondence into consideration, redundant explanations will be omitted. In other words, the specific explanations of base station operations described later can be replaced by the explanations / embodiments in Figure 4 that correspond to the relevant operations. For example, the explanations / embodiments of S410 to S420 in Figure 4 can be additionally applied to the base station operations of S510 to S520 described later. For example, the explanations / embodiments of S430 to S440 in Figure 4 can be additionally applied to the base station operation of S530 described later.

[0232] Figure 5 is a flowchart illustrating a method performed by a base station according to other embodiments of this specification.

[0233] As shown in Figure 5, the method performed by the base station in a wireless communication system according to other embodiments of this specification includes a setting information transmission step (S510), a DL RS transmission step (S520), and a CSI reception step (S530).

[0234] In S510, the base station transmits configuration information related to Channel State Information (CSI) to the terminal.

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

[0236] In S530, the base station receives the CSI from the terminal. The CSI is calculated based on the terminal's measurement of at least one DL RS.

[0237] The operations based on S510 to S530 described above can be realized by the device shown in Figure 6. For example, the base station 100 can control one or more transceivers 130 and / or one or more memories 140 to perform operations based on S510 to S530.

[0238] In the following section, the apparatus to which the embodiments of this specification can be applied (apparatus that realizes the methods / operations according to the embodiments of this specification) will be described with reference to Figure 6.

[0239] Figure 6 shows the configurations of the first and second apparatus according to the embodiments of this 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 a higher layer processing unit 111 and a physical layer processing unit 115. The higher layer processing unit 111 can process the operation of the MAC layer, RRC layer, or higher layers. The physical layer processing unit 115 can process the operation of the PHY layer. For example, if the first device 100 is a base station device in base station-terminal communication, the physical layer processing unit 115 can perform uplink received signal processing, downlink transmitted signal processing, etc. For example, if the first device 100 is a first terminal device in terminal-terminal communication, the physical layer processing unit 115 can perform downlink received signal processing, uplink transmitted signal processing, sidelink transmitted signal processing, etc. In addition to performing baseband-related signal processing, the processor 110 can also control the overall operation of the first device 100.

[0242] The antenna unit 120 may include one or more physical antennas, and if it includes multiple antennas, it can support MIMO transmission and reception. The transceiver 130 may include an RF (Radio Frequency) transmitter and an RF receiver. The memory 140 can 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 the base station in base station-terminal communication (or the operation of the first terminal device in terminal-terminal communication) in the embodiments described herein.

[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 a higher layer processing unit 211 and a physical layer processing unit 215. The higher layer processing unit 211 can process the operation of the MAC layer, RRC layer, or higher layers. The physical layer processing unit 215 can process the operation of the PHY layer. For example, if the second device 200 is a terminal device in base station-terminal communication, the physical layer processing unit 215 can perform downlink received signal processing, uplink transmitted signal processing, etc. For example, if the second device 200 is a second terminal device in terminal-to-terminal communication, the physical layer processing unit 215 can perform downlink received signal processing, uplink transmitted signal processing, sidelink received 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 if it includes multiple antennas, it can support MIMO transmission and reception. The transceiver 230 may include an RF transmitter and an RF receiver. The memory 240 can store information processed by the processor 210, and 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 can 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 herein.

[0248] In the operation of the first device 100 and the second device 200, the matters described in the examples of this 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 applied in the same way, and redundant explanations will be omitted.

[0249] Here, the wireless communication technologies implemented in the devices 100 and 200 of this disclosure may include not only LTE, NR, and 6G, but also Narrowband Internet of Things (NB-IoT) for low-power communication. For example, NB-IoT technology is an example of LPWAN (Low Power Wide Area Network) technology and can be implemented using 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, 200 of this disclosure can communicate based on LTE-M technology. For example, LTE-M technology is an example of LPWAN technology and is known by various names such as eMTC (enhanced Machine Type Communication). For example, LTE-M technology can be implemented using 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 names mentioned above.

[0251] Additionally or alternatively, the wireless communication technologies implemented in the devices 100, 200 of this disclosure may include, but are not limited to, at least one of ZigBee®, Bluetooth®, and Low Power Wide Area Network (LPWAN) technologies, with regard to low-power communication. For example, ZigBee technology can generate personal area networks (PANs) related to small / low-power digital communication based on various standards such as IEEE 802.15.4, and can be referred to by a variety of names.

Claims

1. A step in which user equipment (UE) receives configuration information related to Channel State Information (CSI) from a base station, wherein the configuration information includes information related to group-based beam reporting, The steps include: the UE receiving a DL RS (DownLink Reference Signal) from the base station; The steps include: the UE calculating RSRP (Reference Signal Received Power) based on measurements of the DL RS, The step includes the UE reporting the CSI, including the RSRP, to the base station, Based on the information relating to the group-based beam report set to a first value, the CSI includes a first resource indicator relating to each group of one or more groups, and the resources based on the first resource indicator can be received simultaneously and applied to simultaneous transmission using spatial filtering by the UE. A method in which, based on the information relating to the group-based beam report set to a second value, the CSI includes a second resource indicator relating to each of the one or more groups, and the resources based on the second resource indicator can be applied to simultaneous transmission using spatial filtering by the UE.

2. The aforementioned configuration information includes the reported quantities related to the CSI, The method according to claim 1, wherein the reported 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 aforementioned cri is a CRI (CSI-RS Resource Indicator), and the aforementioned ssb-Index is an SSBRI (SS / PBCH Block Resource Indicator). The aforementioned Index is an index of the UE performance value set, The method according to claim 2, wherein the maximum number of supported SRS antenna ports is indicated based on the index of the UE performance value set.

4. The method according to claim 3, wherein the first resource indicator or the second resource indicator includes i) two CRIs or ii) two SSBRIs.

5. The method according to claim 4, wherein the CSI-RS resources and / or SSB resources of each group can be applied to the simultaneous transmission by the UE.

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

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

8. The method according to claim 7, wherein the UE performance relates to the maximum number of supported SRS antenna ports.

9. The method according to claim 3, wherein the CSI further includes the index of the UE performance value set.

10. The method according to claim 1, wherein the first value is JointULDL and the second value is OnlyUL.

11. The first resource indicator or the second resource indicator is based on the two resource indicators, The method according to claim 1, wherein one CSI-RS or one SSB is selected from each of the two CSI resource sets based on the two resource indicators.

12. UE (user equipment), One or more transceivers, One or more processors, The system comprises one or more memories that are operablely connectable to the one or more processors and that store instructions for configuring the one or more processors to perform operations based on being executed by the one or more processors, The aforementioned operation is, Receiving configuration information related to CSI (Channel State Information) from a base station, wherein the configuration information includes information related to group-based beam reporting. Receiving DL RS (DownLink Reference Signal) from the base station, Calculating RSRP (Reference Signal Received Power) based on the measurement of the DL RS, This includes reporting the CSI, including the RSRP, to the base station, Based on the information relating to the group-based beam report set to a first value, the CSI includes a first resource indicator relating to each group of one or more groups, and the resources based on the first resource indicator can be received simultaneously and applied to simultaneous transmission using spatial filtering by the UE. Based on the information relating to the group-based beam report set to a second value, the CSI includes a second resource indicator relating to each of the one or more groups, and the resources based on the second resource indicator can be applied to simultaneous transmission using spatial filtering by the UE.

13. One or more transceivers, One or more processors, The system comprises one or more memories that are operablely connectable to the one or more processors and that store instructions for configuring the one or more processors to perform operations based on being executed by the one or more processors, The aforementioned operation is, The configuration information related to CSI (Channel State Information) is transmitted to the UE (user equipment), and the said configuration information includes information related to group-based beam reporting. To transmit DL RS (Downlink Reference Signal) to the UE, This includes receiving the CSI, which includes RSRP (Reference Signal Received Power), from the UE, The RSRP is calculated based on the measurement of the UE relative to the DL RS, Based on the information relating to the group-based beam report set to a first value, the CSI includes a first resource indicator relating to each group of one or more groups, and the resources based on the first resource indicator can be received simultaneously and applied to simultaneous transmission using spatial filtering by the UE. Based on the information relating to the group-based beam report set to a second value, the CSI includes a second resource indicator relating to each of the one or more groups, and the resources based on the second resource indicator can be applied to simultaneous transmission using the spatial filter by the UE, the base station.

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