Terminal, wireless communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure comprises: a reception unit for receiving a configuration of one or more sounding reference signal (SRS) resource sets that are each intended for antenna switching and that each use a plurality of SRS ports; and a control unit that applies, on the basis of the configuration, a first association to a plurality of channel state information (CSI)-reference signal (RS) ports from at least one of a plurality of layers, a plurality of codewords, a plurality of SRS port groups, and a plurality of demodulation reference signal (DMRS) ports for a physical downlink shared channel and / or a second association to a plurality of SRS port numbers from the one or more SRS resource sets.

Description

Terminal, wireless communication method, and base station

[0001] This disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems.

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) was specified with the aim of achieving even higher data rates and lower latency (Non-Patent Literature 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) was specified with the aim of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP®) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (for example, 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later) are also being considered.

[0004] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010

[0005] In future wireless communication systems, the applications of sounding reference signals (SRS) are diverse. For example, NR's SRS is used not only for uplink (UL) CSI measurement but also for downlink (DL) CSI measurement and beam management.

[0006] However, the method of using SRS for DL CSI acquisition has not been fully studied. If such study is insufficient, there is a risk of causing a decrease in communication quality / throughput or the like.

[0007] Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately use SRS.

[0008] A terminal according to an aspect of the present disclosure includes a receiving unit that receives a setting of one or more SRS resource sets having an antenna switching application and using a plurality of sounding reference signal (SRS) ports, and based on the setting, from at least one of a plurality of layers, a plurality of codewords, a plurality of SRS port groups, and a plurality of demodulation reference signal (DMRS) ports for a plurality of physical downlink shared channels, a control unit that applies at least one of a first association to a plurality of channel state information (CSI)-reference signal (RS) ports and a second association from the one or more SRS resource sets to a plurality of SRS port numbers.

[0009] According to an aspect of the present disclosure, SRS can be appropriately used.

[0010] FIG. 1 is within different panels of a foldable mobile phone. That is, an example of two port groups of two receivers is shown. FIG. 2 shows an example of an SRS port group for ranks 5 and 6. FIG. 3 shows an example of port grouping according to Option 2 of Embodiment A1. FIGS. 4A - 4C show an example of a port grouping scheme according to Embodiment B1. FIG. 5 shows an example of the association between an SRS port group according to Example 1 of Option 2 - 1 of Embodiment C1 and CSI - RS ports. FIG. 6 shows another example of the association between an SRS port group according to Example 1 of Option 2 - 1 of Embodiment C1 and CSI - RS ports. FIG. 7 shows an example of the association between an SRS resource set according to Option 1 of Embodiment C2 and SRS ports. FIG. 8 shows an example of the association between an SRS resource set according to Option 2 of Embodiment C2 and SRS ports. FIG. 9 is a diagram showing an example of the schematic configuration of a wireless communication system according to an embodiment. FIG. 10 is a diagram showing an example of the configuration of a base station according to an embodiment. FIG. 11 is a diagram showing an example of the configuration of a user terminal according to an embodiment. FIG. 12 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. FIG. 13 is a diagram showing an example of a vehicle according to an embodiment.

[0011] (CSI Report) In Rel. 15 NR, a terminal (also referred to as a user terminal, User Equipment (UE), etc.) generates (also referred to as determines, calculates, estimates, measures, etc.) channel state information (CSI) based on a reference signal (RS) (or a resource for the RS), and transmits (also referred to as reports, feedback, etc.) the generated CSI to a network (e.g., a base station). The CSI may be transmitted to the base station using, for example, an uplink control channel (e.g., Physical Uplink Control Channel (PUCCH)) or an uplink shared channel (e.g., Physical Uplink Shared Channel (PUSCH)).

[0012] The RS used to generate the CSI may be at least one of the following: Channel State Information Reference Signal (CSI-RS), Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, Synchronization Signal (SS), or Demodulation Reference Signal (DMRS).

[0013] The CSI-RS may include at least one of Non Zero Power (NZP) CSI-RS and CSI-Interference Management (CSI-Interference Measurement, CSI-IM). The SS / PBCH block is a block that includes SS and PBCH (and corresponding DMRS), and may be called an SS block (SSB), etc. The SS may also include at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).

[0014] Furthermore, CSI may include at least one of the following: Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), CSI-RS Resource Indicator (CRI), SS / PBCH Block Resource Indicator (SSBRI, SSB Index), Layer Indicator (LI), Rank Indicator (RI), L1-RSRP (Layer 1 Reference Signal Received Power), L1-RSRQ (Reference Signal Received Quality), L1-SINR (Signal to Interference plus Noise Ratio), L1-SNR (Signal to Noise Ratio).

[0015] The UE may receive information regarding CSI reporting (report configuration information) and control CSI reporting based on that report configuration information. This report configuration information may be, for example, the "CSI-ReportConfig" information element (IE) of Radio Resource Control (RRC).

[0016] The reporting configuration information (for example, "CSI-ReportConfig" in RRC IE) may include, for example, at least one of the following: ◆ Information about the type of CSI report (report type information, for example, "reportConfigType" in RRC IE) ◆ Information about one or more quantities (one or more CSI parameters) of CSI to be reported (report quantity information, for example, "reportQuantity" in RRC IE) ◆ Information about the RS resources used to generate the quantity (the CSI parameter) (resource information, for example, "CSI-ResourceConfigId" in RRC IE) ◆ Information about the frequency domain to which the CSI report is applied (frequency domain information, for example, "reportFreqConfiguration" in RRC IE)

[0017] For example, the reporting type information may indicate a periodic CSI (P-CSI) report, an aperiodic CSI (A-CSI) report, or a semi-persistent CSI (SP-CSI) report.

[0018] Furthermore, the reported quantity information may specify at least one combination of the above-mentioned CSI parameters (e.g., CRI, RI, PMI, CQI, LI, L1-RSRP, etc.).

[0019] Furthermore, the resource information may also be the ID of the RS resource. The RS resource may include, for example, a non-zero power CSI-RS resource or SSB and a CSI-IM resource (for example, a zero-power CSI-RS resource).

[0020] Furthermore, frequency domain information may indicate the frequency granularity of the CSI report. This frequency granularity may include, for example, wideband and subband. The wideband is the entire CSI reporting band. The wideband may be, for example, the entire carrier (component carrier (CC), cell, serving cell) or the entire bandwidth part (BWP) within a carrier. The wideband may also be referred to as the CSI reporting band, the entire CSI reporting band, etc.

[0021] Furthermore, a subband may be part of the wideband and may consist of one or more resource blocks (Resource Blocks (RBs) or Physical Resource Blocks (PRBs)). The size of the subband may be determined according to the size of the BWP (number of PRBs).

[0022] Frequency domain information may indicate whether to report wideband or subband PMI (frequency domain information may include, for example, the RRC IE's "pmi-FormatIndicator" used to determine whether to report wideband PMI or subband PMI). Based on at least one of the above-mentioned reporting quantity information and frequency domain information, the UE may determine the frequency granularity of the CSI report (i.e., whether to report wideband PMI or subband PMI).

[0023] If wideband PMI reporting is established (decided), one wideband PMI may be reported for the entire CSI reporting band. On the other hand, if subband PMI reporting is established, a single wideband indication i1 may be reported for the entire CSI reporting band, and one subband indication i2 (e.g., subband indication for each subband) may be reported for one or more subbands within the entire CSI reporting band.

[0024] The UE performs channel estimation using the received RS and estimates the channel matrix H. The UE then feeds back the index (PMI) determined based on the estimated channel matrix.

[0025] PMI may represent a precoder matrix (also simply called a precoder) that a UE considers appropriate for use in downlink (DL) transmissions to the UE. Each value of PMI may correspond to a single precoder matrix. A set of PMI values ​​may correspond to a different set of precoder matrices called a precoder codebook (also simply called a codebook).

[0026] In a spatial domain, a CSI report may include one or more types of CSIs. For example, the CSI may include at least one of a first type (Type 1 CSI) used for single-beam selection and a second type (Type 2 CSI) used for multi-beam selection. A single beam may be rephrased as a single layer, and a multi-beam as multiple beams. Furthermore, a Type 1 CSI may not assume multi-user multiple input multiple output (MU-MIMO), while a Type 2 CSI may assume multi-user MIMO.

[0027] The above codebooks may include a codebook for Type 1 CSI (also referred to as a Type 1 codebook, etc.) and a codebook for Type 2 CSI (also referred to as a Type 2 codebook, etc.). Furthermore, Type 1 CSI may include Type 1 single-panel CSI and Type 1 multi-panel CSI, and different codebooks (Type 1 single-panel codebook and Type 1 multi-panel codebook) may be specified for each.

[0028] In this disclosure, Type 1 and Type I may be interpreted as interchangeable. In this disclosure, Type 2 and Type II may be interpreted as interchangeable.

[0029] The Upbound Control Information (UCI) type may include at least one of Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), scheduling request (SR), or CSI. The UCI may be carried by PUCCH or by PUSCH.

[0030] In Rel. 15 NR, the UCI may include one CSI part for wideband PMI feedback. CSI report #n includes PMI wideband information, if reported.

[0031] In Rel. 15 NR, the UCI may include two CSI parts for subband PMI feedback. CSI part 1 contains wideband PMI information. CSI part 2 contains one wideband PMI piece and several subband PMI pieces. CSI parts 1 and 2 are encoded separately.

[0032] In Rel. 15 NR, the UE is configured by a higher layer with N (N≧1) CSI reporting settings and M (M≧1) CSI resource settings. For example, a CSI reporting setting (CSI-ReportConfig) includes a resource setting for channel measurement (resourcesForChannelMeasurement), a CSI-IM resource setting for interference (csi-IM-ResourceForInterference), an NZP-CSI-RS resource setting for interference (nzp-CSI-RS-ResourceForInterference), and a report quantity (reportQuantity). Each of the resource settings for channel measurement, the CSI-IM resource setting for interference, and the NZP-CSI-RS setting for interference is associated with a CSI resource setting (CSI-ResourceConfig, CSI-ResourceConfigId). The CSI resource configuration includes a list of CSI-RS resource sets (csi-RS-ResourceSetList, e.g., NZP-CSI-RS resource set or CSI-IM resource set).

[0033] To enable more dynamic channel / interference hypotheses for NCJT, targeting both FR1 and FR2, evaluation and specification of CSI reporting for at least one multi-TRP and multi-panel transmission of DL are being considered.

[0034] In this disclosure, CSI-RS, periodic CSI-RS (P-CSI-RS), semi-persistent CSI-RS (SP-CSI-RS), and aperiodic CSI-RS (AP-CSI-RS, A-CSI-RS) may be interpreted interchangeably. In this disclosure, CSI-RS, periodic CSI reporting (P-CSI reporting), semi-persistent CSI reporting (SP-CSI reporting), and aperiodic CSI reporting (AP-CSI reporting, A-CSI reporting) may be interpreted interchangeably.

[0035] (Codebook Configuration) The UE configures the parameters related to the codebook (CB) (Codebook Configuration) via upper-layer signaling (RRC signaling). The codebook configuration is included in the upper-layer (RRC) parameter CSI-ReportConfig.

[0036] In the codebook configuration, at least one codebook is selected from among several codebooks, including type I single panel (typeI-SinglePanel), type I multi-panel (typeI-MultiPanel), type II, and type II port selection (typeII-PortSelection).

[0037] The codebook parameters include parameters related to codebook subset restrictions (CBSRs) ("...Restriction" in CodebookConfig). The CBSR setting is a bit that indicates which PMI reports are allowed ("1") and which are not allowed ("0") for the precoder associated with the CBSR bit. Each bit in the CBSR bitmap corresponds to one codebook index / antenna port.

[0038] (CSI Reporting Settings) Existing CSI reporting settings (CSI-ReportConfig) include, in addition to codebook settings (CodebookConfig), channel measurement resources (CMR), interference measurement resources (IMR), etc. The IMR may be at least one of zero power-interference measurement resources (ZP-IMR) and non-zero power-interference measurement resources (NZP-IMR).

[0039] In this disclosure, CMR, NZP CSI-RS resources, and resourcesForChannelMeasurement may be interpreted as interchangeable. In this disclosure, ZP-IMR, CSI-IM resources, and csi-IM-ResourcesForInterference may be interpreted as interchangeable. In this disclosure, NZP-IMR, NZP CSI-RS resources for interferometry, and nzp-CSI-RS-ResourcesForInterference may be interpreted as interchangeable.

[0040] (CSI-RS port) In Rel. 15, CSI-RS is used as a DL RS for at least one of channel state information (CSI) acquisition, beam management (BM), beam failure recovery (BFR), and fine tracking of time and frequency. CSI-RS supports 1, 2, 4, 8, 12, 16, 24, and 32 ports (antenna ports, CSI-RS ports). CSI-RS supports periodic, semi-persistent, and aperiodic transmissions. The frequency density of the CSI-RS is configurable to adjust overhead and CSI estimation accuracy.

[0041] The specification defines a table showing the CSI-RS locations within a slot. Each row in this table shows the row number, port number, frequency domain density, CDM type, time and frequency (time / frequency) location (component resource location (k-bar, l-bar)), code division multiplexing (CDM) group index, and the location of each resource within the component resource ((RE, symbol), (k', l')). Here, the time / frequency location is the location of the CSI-RS time and frequency resource (component resource) corresponding to one port. The k-bar is a notation with an overlined "k". The k-bar indicates the starting resource element (RE) index of the component resource, and the l-bar indicates the starting symbol (OFDM symbol) index of the component resource.

[0042] The CDM group includes no CDM (N / A), FD-CDM2, CDM4, and CDM8. FD-CDM2 multiplexes two-port CSI-RS at the same time and frequency by multiplying a 2-length frequency domain (FD)-orthogonal cover code (OCC) in RE units (FD2). CDM4 multiplexes four-port CSI-RS at the same time and frequency by multiplying a 2-length FD-OCC and a 2-length time domain (TD)-OCC in RE units and symbol units (FD2TD2). CDM8 multiplexes eight-port CSI-RS at the same time and frequency by multiplying a 2-length FD-OCC and a 4-length TD-OCC in RE units and symbol units (FD2TD4).

[0043] (Rel. 19 MIMO Consideration) Because the maximum number of CSI-RS ports, 32, is greater than the maximum number of layers, 8, the UE can measure the status of many channels and improve measurement accuracy.

[0044] Since Rel. 19, massive MIMO using more than 32 ports has been considered.

[0045] A CSI supporting up to 128 CSI-RS ports is being considered, targeting FR1. Specifically, the following items are being considered: ◆ Item 2a: An improvement to the Type 1 codebook that supports up to 128 CSI-RS ports in total across all resources, based on an extension of the existing codebook and assuming existing CSI-RS resources (with up to 32 CSI-RS ports per resource). ◆ Item 2b: An improvement to the Type 2 codebook that supports up to 128 CSI-RS ports in total across all resources, based on an extension of the existing codebook and assuming existing CSI-RS resources (with up to 32 CSI-RS ports per resource), without changing any codebook parameters other than introducing an additional value for the codebook parameter for the number of ports. ◆Item 2c: Extension of CRI-based CSI reporting (reporting of CQI / PMI / RI calculated for each CRI for one or more CRIs) for hybrid beamforming that supports up to 128 CSI-RS ports in total across all resources, using up to 32 CSI-RS ports per resource, without requiring a new codebook design. ◆Item 2d: For 6 / 8Rx low complexity receivers supporting more than four layers, SRS port grouping and association of SRS port groupings to two codewords are being considered using existing codebooks. The 6 / 8Rx low complexity receiver may use six or eight Rx antennas. Extensions to the mapping from codewords to layers, DL resource placement, CSI feedback, and DCI format are not required.

[0046] (Transmission with more than 4 antenna ports) Rel. 15 / 16 NR supports uplink (UL) Multi Input Multi Output (MIMO) transmission up to 4 layers. For future wireless communication systems, support for UL transmission with more than 4 layers is being considered to achieve higher spectral efficiency. For example, for Rel. 18 NR, up to 6 ranks of transmission using 6 antenna ports, and up to 6 or 8 ranks of transmission using 8 antenna ports are being considered.

[0047] Furthermore, precoding matrices for UL transmissions using more than four antenna ports are being considered. For example, a codebook for 8-port transmissions (which may also be called an 8 Transmission(TX) UL codebook) is being considered.

[0048] In antenna layouts, Ng is the number of antenna groups. M is the number of antennas (or antenna elements) in the first dimension, and N is the number of antennas (or antenna elements) in the second dimension. The first and second dimensions are, for example, the horizontal and vertical directions. P is the number of polarization planes. When P = 2, it is a cross-polarized antenna.

[0049] An antenna group may also be called a coherent group. A coherent group may contain one or more coherent ports. For example, a partially coherent UE may have multiple coherent groups. Antenna ports within a coherent group may be coherent. Antenna ports between different coherent groups may not be coherent.

[0050] Each coherent group may correspond to a different transmit panel / transmit chain (Tx chain) / SRS resource set / RS resource set / spatial relation info / joint Transmission Configuration Indication state (joint TCI state) / UL TCI state / received TRP. Here, the SRS resource set may specifically correspond to an SRS resource set used in a codebook or non-codebook. Also, each coherent group may correspond to a different receive TRP. Furthermore, a coherent group may also be called a coherent antenna group, port group, antenna set, etc.

[0051] The UE may report supported antenna groups, antenna placement information, and coherence count as UE capability information. The UE may also configure coherence groups (e.g., the number of coherence groups, the number of ports included in each coherence group) through upper-layer signaling.

[0052] The number of panels on which antennas are placed, the orientation of the panels, the coherence of each panel / antenna (fully coherent, partially coherent, noncoherent, etc.), the antenna arrangement in a specific direction (horizontal, vertical, etc.), and the polarization antenna configuration (single polarization, cross polarization, number of polarization planes, etc.) may differ from existing antenna layouts. dG-H and dG-V represent the horizontal and vertical spacing between the centers of adjacent antenna groups, respectively.

[0053] Furthermore, while Rel. 15 / 16 NR supported the transmission of one codeword (CW) per pusher, for Rel. 18 NR, it is being considered that UEs (User Enforcements) will transmit more than one CW per pusher. For example, support for two CW transmissions for ranks 5-8 and support for two CW (dual CW) transmissions for ranks 2-8 are being considered. One CW corresponds to one transport block (TB).

[0054] Prior to Rel. 17 NR, DL transmissions (e.g., PDSCH transmissions) supported the transmission of two TBs (e.g., TB#1 and TB#2). When two TBs (e.g., TB#2) are supported, the DCI used for scheduling the PDSCH (e.g., DCI format 1_1) may include predetermined fields for TB#1 and predetermined fields for TB#2, respectively. The predetermined fields may be at least one of the following: modulation and coding scheme, new data indicator, or redundancy version.

[0055] In PUSCH transmission, the support (or activation) of dual CW may be communicated from the base station to the UE by a predetermined upper-layer parameter. The predetermined upper-layer parameter may be an upper-layer parameter relating to the maximum number of CWs scheduled by DCI (e.g., maxNrofCodeWordsScheduledByDCI). The predetermined upper-layer parameter (e.g., maxNrofCodeWordsScheduledByDCI) may be included in the PUSCH configuration information (e.g., PUSCH-config).

[0056] For example, if a predetermined higher-layer parameter is set to 2 (e.g., maxNrofCodeWordsScheduledByDCI equals 2), it may mean that a predetermined field for TB#2 is included in the DCI. In other words, if a predetermined higher-layer parameter indicates a predetermined value (e.g., 2) for a PDSCH, it may mean that a field for TB#2 exists (or that two codeword transmission is enabled).

[0057] If a predetermined higher-layer parameter (e.g., maxNrofCodeWordsScheduledByDCI) indicates that two codeword transmissions (e.g., two codeword transmissions) are enabled, then one of the two transport blocks may be disabled in DCI format if certain conditions are met. For example, the predetermined conditions may be that the MCS index (e.g., I) is set for the corresponding transport block. ＭＣＳ ) and the RV index each reach predetermined values ​​(for example, I ＭＣＳ It is also possible that = 26 and RV = 1.

[0058] In this way, a predetermined upper-level parameter is set to a predetermined value (for example, maxNrofCodeWordsScheduledByDCI=2), I ＭＣＳ If there is a TB where =26 and RV=1, the corresponding TB may be disabled to enable dynamic instruction (or switching) between having more than 4 layers and fewer than 4 layers for the PDSCH.

[0059] In this disclosure, the first TB, TB1, and the second TB, TB2, may be interpreted as interchangeable.

[0060] N SRS > In NCB-based 8Tx PUSCH transmission using 4, it is being considered that a method based on existing specifications will be supported. Here, N SRS This is the number of single-port SRS resources configured within the SRS resource set. The method is N SRS =8 and L max Extend the existing SRI instruction table to include =8. Here, L max This is the maximum number of MIMO layers. In the SRI instruction for NCB-based PUSCH, a bitmap instruction and a method based on existing specifications may be selected.

[0061] To configure PUSCH transmission using 8Tx UE, it is being considered to extend the range of maxRank and maxMIMO-Layers to 8, thereby setting the maximum number of MIMO layers in RRC. The maximum rank is set by RRC signaling.

[0062] To support dual CW push transmission for more than four ranks with 8Tx UE, it is being considered to indicate a second MCS field (5 bits) for the second CW for MCS indication. To support dual CW push transmission for more than four ranks with 8Tx UE, it is being considered to indicate a second set of fields for new data indicator (NDI, 1 bit) and redundancy version (RV, 2 bits). In other words, an additional MCS / NDI / RV for the second CW will be supported.

[0063] (SRS) In NR, the Sounding Reference Signal (SRS) has a wide range of applications. The SRS in NR is used not only for CSI measurement of the uplink (UL), which was also used in existing LTE (LTE Rel. 8-14), but also for CSI measurement of the downlink (DL), beam management, and other applications.

[0064] A UE may configure one or more SRS resources. SRS resources may be identified by an SRS Resource Index (SRI).

[0065] Each SRS resource may have one or more SRS ports (or support one or more SRS ports). For example, the number of ports per SRS may be 1, 2, 4, etc.

[0066] A UE may configure one or more SRS resource sets. A single SRS resource set may be associated with a predetermined number of SRS resources. A UE may use common upper-layer parameters with respect to the SRS resources included in a single SRS resource set. In this disclosure, the term "resource set" may be interpreted as "set," "resource group," "group," etc.

[0067] Information regarding SRS resources or resource sets may be set in the UE using upper-layer signaling, physical layer signaling, or a combination thereof.

[0068] The SRS settings [information element] (for example, the RRC information element "SRS-Config") may include SRS resource set settings [information element], SRS resource settings [information element], etc.

[0069] The SRS resource set setting [information element] (for example, the RRC parameter "SRS-ResourceSet") may include information on the SRS resource set ID (Identifier) ​​(SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, the SRS resource type (resourceType), and the usage of the SRS.

[0070] Here, the SRS resource type may indicate the same time domain behavior of the SRS resource configuration, and may indicate one of the following: Periodic SRS (P-SRS), Semi-Persistent SRS (SP-SRS), or Aperiodic SRS (A / AP-SRS). The UE may send P-SRS and SP-SRS periodically (or periodically after activation). The UE may send A-SRS based on DCI's SRS request.

[0071] Also, the uses of SRS (the "usage" of RRC parameters and the "SRS-SetUse" of L1 (Layer-1) parameters) may be, for example, beam management (beamManagement), codebook (codebook(CB)), non-codebook (non-codebook(NCB)), antenna switching (antennaSwitcing), etc. For example, SRS for codebook or non-codebook use may be used to determine the precoder for codebook-based or non-codebook-based Physical Uplink Shared Channel (PUSCH) transmission based on SRI.

[0072] For SRS for beam management use, it may be assumed that only one SRS resource can be transmitted for each SRS resource set at a given time instant. Note that in the same Bandwidth Part (BWP), if multiple SRS resources corresponding to the behavior in the same time domain belong to different SRS resource sets, these SRS resources may be transmitted simultaneously.

[0073] The SRS resource configuration [information element] (for example, the "SRS-Resource" of RRC parameters) may include the SRS resource ID (SRS-ResourceId), the number of SRS ports, the SRS port number, the transmission comb number, the SRS resource mapping (for example, the time and / or frequency resource position, resource offset, resource period, repetition number, number of SRS symbols, SRS bandwidth, etc.), hopping-related information, the SRS resource type, the sequence ID, spatial relationship information, etc.

[0074] The value of the transmission comb number (transmissionComb) is {2, 4}. The number of ports N ap SRS of SRS has a value of {1, 2, 4}. The antenna port number p i has a value of {1000, 1001,...}. The number of consecutive OFDM symbols N symb SRSThe value of is {1, 2, 4}. The symbol offset l is counted in the reverse direction of the time domain from the end of the slot relative to the start position in the time domain (startPosition). offset The order is {0,1,...5}, and the starting position is l0=N symb slot -1-l offset It is given by.

[0075] The setting for the number of combos to send may include the combo offset and cyclic shift (CS) index, CS number.

[0076] comb offset (subcarrier offset) = {0, 1, ... K} TC SRS from UEs where at least one of {-1} and CS is different may be multiplexed using the same number of transmit combs, the same RB and the same symbols.

[0077] The UE may switch the Bandwidth Part (BWP) that transmits SRS for each slot, or it may switch the antenna. The UE may also apply at least one of intra-slot hopping and inter-slot hopping to SRS transmission.

[0078] In existing SRS, p i k0, the starting position of the frequency domain for (p_i) p_i k0 is given by the following equation A1. p_i =k - 0 p_i +Σ b=0 BSRS K TC M SC,b SRS n b (A1)

[0079] Here, k - This indicates a variable k with an overline, and may also be called a k-bar. - 0 p_i is comb offset K - TC It may also be based on K. TCThis is the number of combos sent. SC,b SRS is the SRS bandwidth m SRS,b [RB] is the number of subcarriers used for SRS transmission. b It is a constant.

[0080] In this disclosure, SRS, periodic SRS (P-SRS), semi-persistent SRS (SP-SRS), and aperiodic SRS (AP-SRS, A-SRS) may be interpreted as interchangeable.

[0081] (UE Sounding Procedure for DL ​​CSI Acquisition) In Rel. 15 NR, as described above, antenna switching (which may also be called antenna port switching) can be configured as an application of the SRS. SRS antenna switching may be used, for example, in a Time Division Duplex (TDD) band when acquiring the downlink CSI using the uplink SRS.

[0082] For example, a precoder for the CSI-RS may be determined based on the SRS transmitted by the UE, and the UE may calculate / transmit a CSI report [using a Type 2 port selection codebook] by receiving / measuring the CSI-RS to which the precoder has been applied (beamformed).

[0083] For example, for a UE that has the capability of having fewer antenna ports available for transmission than for reception, the SRS measurement of the UL may be used to determine the DL precoder.

[0084] Furthermore, the UE may report UE capability information to the network indicating the supported SRS transmit (Tx) port switching patterns (e.g., supportedSRS-TxPortSwitch in the RRC parameter srs-TxSwitch). This pattern may be expressed in the form of "txry", such as "t1r2", "t2r4", etc., which may mean that SRS transmission can be performed using x antenna ports out of a total of y antennas, where y may correspond to all or a subset of the UE's receiving antennas.

[0085] In this disclosure, txry and xTyR may be interpreted as mutually interchangeable for (x, y).

[0086] Note that if x and y in "txty" have the same value, it can also be written as xT = xR (for example, 4T = 4R).

[0087] For example, a UE with 2T4R (2 transmit ports, 4 receive ports) may be configured to include two SRS resource sets, each having two ports, for DL ​​CSI acquisition, and whose purpose is antenna switching.

[0088] The UE capability information for an SRS transmit switch (srs-TxSwitch) indicates whether it supports SRS for DL ​​CSI acquisition (DL CSI acquisition, transmit antenna switching, SRS antenna switching). This UE capability information includes the parameter supportedSRS-TxPortSwitch. supportedSRS-TxPortSwitch indicates the SRS Tx port switching pattern supported by the UE. The SRS transmit port switching pattern is a mandatory function with capability signaling.

[0089] In this disclosure, the terms "SRS Tx port switching pattern" and "SRS antenna switching setting" may be interpreted as interchangeable.

[0090] The value of supportedSRS-TxPortSwitch may be 't1r2' for 1T2R, 't2r4' for 2T4R, 't1r4' for 1T4R, 't1r4-t2r4' for 1T4R / 2T4R, 't1r1' for 1T=1R, 't2r2' for 2T=2R, 't4r4' for 4T=4R, or 'notSupported' for non-support.

[0091] The UE antenna switching capability, indicated as xTyR ('txry') by supportedSRS-TxPortSwitch, corresponds to a UE capable of SRS transmission over x antenna ports across a total of y antennas. y corresponds to all or a subset of the UE receiving antennas. For example, 2T4R represents two pairs of antennas.

[0092] A supported SRS-TxPortSwitch may report at least one of the following values: 't1r2', 't1r4', 't2r4', 't2r2', 't4r4', or 't1r4-t2r4'.

[0093] srs-TxSwitch may include txSwitchImpactToRx and txSwitchWithAnotherBand. txSwitchImpactToRx indicates the lowest band entry number of the UL group (see txSwitchWithAnotherBand below) that affects the DL of this band entry. txSwitchWithAnotherBand indicates the lowest band entry number of the UL group. A UL group is defined as a band entry with ULs that affect each other's ULs. That is, SRS Tx port switching on any cell in that group affects ULs on all cells in that group. If a UL group contains only one band entry, this parameter is not present. In txSwitchImpactToRx and txSwitchWithAnotherBand, a value of 1 means the first entry, and a value of 2 means the second entry. Even if supportedSRS-TxPortSwitch is set to 'notSupported' for a band entry, the UE may include txSwitchImpactToRx and txSwitchWithAnotherBand for that band entry. All DLs and ULs that switch together indicate the same entry number. The entry number is the band entry number within the band combination. The UE is restricted from including fallback band combinations for the purpose of indicating different SRS switching capabilities. Bands containing ULs include bands associated with a FeatureSetUplinkId set to 0, corresponding to support for SRS-SwitchingTimeNR.

[0094] If a UE is configured using an SRS-ResourceSet and the usage (upper layer parameter) within that SRS-ResourceSet is set to 'antennaSwitching', the UE does not assume that different spatial relationships are set for multiple SRS resources within the same SRS-ResourceSet.

[0095] If a UE is configured using an SRS-ResourceSet and the usage (upper layer parameter) within that SRS-ResourceSet is set to 'antennaSwitching', the UE may configure one of the following settings 1 to 5, depending on the indicated (reported) UE capability information (which may be UE antenna switching capability information, or UE capability information indicating the SRS transmit port switching pattern (SRS antenna switching configuration) supported by the UE, supportedSRS-TxPortSwitch).

[0096] [Setting 1] Up to two SRS resource sets for 1T2R, with different values ​​set for the resource type (upper layer parameter resourceType) within the SRS resource set. Each set has two SRS resources transmitted in different symbols, and each SRS resource in a given set consists of a single SRS port, and the SRS port of the second resource in the set is associated with a different UE antenna port than the SRS port of the first resource in the same set.

[0097] [Configuration 2] Up to two SRS resource sets for 2T4R, with different values ​​set for the resource type (upper layer parameter resourceType) within the SRS resource set. Each SRS resource set has two SRS resources transmitted in different symbols, and each SRS resource in a given set consists of two SRS ports, and the SRS port pair of the second resource in the set is associated with a different UE antenna port pair than the SRS port pair of the first resource in the same set.

[0098] [Configuration 3] Zero or one SRS resource set, having four SRS resources transmitted in different symbols for 1T4R, and configured with a resource type (upper layer parameter resourceType) within the SRS resource set, which is set periodically or semi-persistently. Each SRS resource in a given set consists of a single SRS port, and the SRS port of each resource is associated with a different UE antenna port.

[0099] [Configuration 4] 1T4R has a total of four SRS resources transmitted in two different slots with different symbols, and each SRS resource set has a resource type (upper layer parameter resourceType) set aperiodically. The SRS port of each SRS resource in the given two sets is associated with a different UE antenna port. Each of the two sets is configured with two SRS resources, or one set is configured with one SRS resource and the other set with three SRS resources. The UE expects that both of the two sets are configured with the same values ​​for the power control parameters (upper layer parameters alpha, p0, pathlossReferenceRS, and srs-PowerControlAdjustmentStates) within the SRS resource set. The UE assumes that the values ​​of the parameters within each SRS resource set (the upper-layer parameter aperiodicSRS-ResourceTrigger, a parameter indicating the code point of the SRS request field in DCI) are the same, and that the values ​​of the upper-layer parameter slotOffset within each SRS resource set are different.

[0100] [Setting 5] Up to two SRS resource sets, each having one SRS resource for 1T=1R, 2T=2R, or 4T=4R. The number of SRS ports for each resource is 1, 2, or 4.

[0101] If the UE sets the use within the SRS resource set to antenna switching, the UE may configure the SRS antenna switching settings based on the reported UE capability information (supportedSRS-TxPortSwitch, supportedSRS-TxPortSwitch-v1610).

[0102] If a set of SRS resources is transmitted within the same slot as a Y symbol, the UE sets a guard period for the Y symbol during which the UE does not transmit any other symbols. The guard period is between the SRS resources of that set.

[0103] If the indicated UE capability is 1T4R / 2T4R, the UE assumes that all SRS resources within the SRS resource set will be configured with the same number of SRS ports, either 1 or 2.

[0104] If the indicated UE capability is 1T2R, 2T4R, 1T4R, or 1T4R / 2T4R, the UE does not expect to configure or trigger more than one SRS resource set with an application (upper layer parameter usage) set for antenna switching in the same slot. If the indicated UE capability is 1T1R, 2T2R, or 4T4R, the UE does not expect to configure or trigger more than one SRS resource set with an application (upper layer parameter usage) set for antenna switching in the same symbol.

[0105] UE capability information for SRS transmit switches (srs-TxSwitch-v1610) may include the parameter supportedSRS-TxPortSwitch-v1610. Reporting of this parameter is optional. supportedSRS-TxPortSwitch-v1610 indicates a downgrading configuration of the SRS transmit port switching pattern, and reporting of this parameter is optional. When a UE indicates support for a downgrading configuration of the SRS transmit port switching pattern using supportedSRS-TxPortSwitch-v1610, it may report at least one of the following values ​​to indicate support for the downgrading configuration, based on what is reported within supportedSRS-TxPortSwitch.・'t1r1-t1r2' ・'t1r1-t1r2-t1r4' ・'t1r1-t1r2-t2r2-t2r4' ・'t1r1-t2r2' ・'t1r1-t2r2-t4r4' ・'t1r1-t1r2-t2r2-t1r4-t2r4'

[0106] In this disclosure, the downgrade setting and the SRS Tx port switching pattern that uses fewer antennas / ports than the total number of antennas / total number of antennas / total number of Rx antennas / maximum number of Rx ports may be interpreted as mutually exclusive.

[0107] Rel. 17 UE capability signaling (srs-AntennaSwitchingBeyond4RX-r17) indicates whether the UE supports SRS antenna switching for more than four Rx. Its capability signaling has several parameters: - supportedSRS-TxPortSwitchBeyond4Rx-r17. This indicates the supported xTyR combinations. It is an 11-bit bitmap. The bitmap starts from the first / leftmost bit (bit 0). Each bit corresponds to {t1r1, t2r2, t1r2, t4r4, t2r4, t1r4, t2r6, t1r6, t4r8, t2r8, t1r8}. In any indication value, x is less than or equal to the value associated with the largest y. - entryNumberAffectBeyond4Rx-r17. This indicates the entry number of the band listed first with UL within the band combination affecting this DL. - entryNumberSwitchBeyond4Rx-r17. This indicates the entry number of the band listed first with this UL within the band combination that switches with UL.

[0108] UEs that demonstrate support for this capability indicate support for srs-TxSwitch.

[0109] If the same xYyR value reported using supportedSRS-TxPortSwitch / supportedSRS-TxPortSwitch-v1610 is reported within supportedSRS-TxPortSwitchBeyond4Rx-r17, the reported values ​​for entryNumberAffectBeyond4Rx-r17 and entryNumberSwitchBeyond4Rx-r17 are invalid.

[0110] In this disclosure, the terms "SRS transmission port switching pattern" and "antenna switching SRS setting" may be interpreted as interchangeable.

[0111] (Data physical layer procedure / UE procedure for CSI reporting / CSI framework / reporting settings / reporting quantity settings) If a UE has CSI-ReportConfig configured with the higher layer parameter reportQuantity set in 'cri-RI-CQI', the UE will follow several steps as follows:

[0112] ◆If the UE has the upper layer parameter non-PMI-PortIndication set in CSI-ReportConfig, the r ports will be indicated according to the layer order for rank r, and each CSI resource in the CSI resource setting will be linked to CSI-ReportConfig based on the order of the NZP-CSI-RS-ResourceId associated in the CSI resource setting linked for channel measurement given by the upper layer parameter resourcesForChannelMeasurement. The upper layer parameter non-PMI-PortIndication that is set is the series p0 of the port index. (1) ,p0 (2) , p1 (2) ,p0 (3) , p1 (3) , p2 (3) ,...,p0 (R) , p1 (R) ,..., p R-1 (R) This includes p0 (v) ,..., p v-1 (v)is the CSI-RS port index associated with rank v, where R ∈ {1, 2, ..., P}, where P ∈ {1, 2, 4, 8} is the number of ports in the CSI-RS resource. Its UE reports only the RI corresponding to the configured fields of PortIndexFor8Ranks. If a CSI-ReportConfig is configured that includes a list of subsets having portSubsetIndicators configured within each subconfiguration, and the higher-layer parameter non-PMI-PortIndication is provided separately for each subconfiguration, then P ∈ {1, 2, 4, 8} corresponds to the number of bits with the value 1 in the bitmap portSubsetIndicator for that subconfiguration, and its CSI-RS port index is derived by mapping the antenna ports corresponding to all bits with the value 1 in portSubsetIndicator as a sequence of antenna ports starting from CSI-RS port index 0 in ascending order of the bit positions in portSubsetIndicator.

[0113] ◆If the UE does not have the upper layer parameter non-PMI-PortIndication set, the UE will set the CSI-RS port index p0 for each CSI-RS resource in the CSI resource setting linked to CSI-ReportConfig. (v) ,..., p v-1 (v)Assume that = {0,...,v-1} is associated with rank v=1,2,...,P, where P∈{1,2,4,8} is the number of ports in the CSI-RS resource. If the UE is configured with a CSI-ReportConfig containing a list of sub-configurations that have portSubsetIndicators set within each sub-configuration, and the higher-layer parameter non-PMI-PortIndication is not provided, then P∈{1,2,4,8} corresponds to the number of bits with the value 1 in the bitmap portSubsetIndicator for that sub-configuration, and the CSI-RS port index is derived by mapping the antenna ports corresponding to all bits with the value 1 in portSubsetIndicator as a sequence of antenna ports starting from CSI-RS port index 0 in ascending order of the bit positions in portSubsetIndicator.

[0114] ◆The non-PMI-PortIndication is a port indication for the calculation of RI / CQI. For each CSI-RS resource in the linked ResourceConfig for channel measurement, the port indication for each rank R indicates which R ports will be used. This port indication is available only for non-PMI feedback. The first entry in the non-PMI-PortIndication corresponds to the NZP-CSI-RS-Resource indicated by the first entry in nzp-CSI-RS-ResourceSet, which is shown in the first entry of nzp-CSI-RS-ResourceSetList in the CSI-ResourceConfig. The second entry in the non-PMI-PortIndication corresponds to the NZP-CSI-RS-Resource indicated by the second entry in nzp-CSI-RS-ResourceSet, which is shown in the first entry of nzp-CSI-RS-ResourceSetList in the same CSI-ResourceConfig. The same applies to the following entries up to the NZP-CSI-RS-Resource, which is shown in the first entry of the nzp-CSI-RS-ResourceSetList in the same CSI-ResourceConfig, and is indicated by the last entry of nzp-CSI-RS-Resources within the NZP-CSI-RS-ResourceSet. Subsequently, the next entry corresponds to the NZP-CSI-RS-Resource, which is shown in the second entry of the nzp-CSI-RS-ResourceSetList in the same CSI-ResourceConfig, and is indicated by the first entry of nzp-CSI-RS-Resources within the NZP-CSI-RS-ResourceSet, and so on.

[0115] (Analysis) It has been examined that there are no extensions to mapping from CW to layers regarding the RRC settings / definitions for SRS port / resource grouping / association and the RRC settings / definitions for CW (DMRS ports) grouping / association.

[0116] Multiple port grouping schemes are being considered for reporting via UE capability signaling. For example, a specific UE implementation that supports grouping of SRS ports (0, 2, 4, 6) and SRS ports (1, 3, 5, 7) would look like this:

[0117] ◆When using two separate receivers on the two panels of a foldable mobile phone, there are implementation cases where the RF cables [both Tx and Rx] cannot cross the hinge. Therefore, the SRS port groups need to be updated from the group of SRS ports (0,1,2,3) and the group of SRS ports (4,5,6,7) to the group of SRS ports (0,2,4,6) and the group of SRS ports (1,3,5,7).

[0118] ◆In the 2T8R shown in Figure 1, the numbering of the SRS ports spanning the four resources is (0,1), (2,3), (4,5), and (6,7), and [because multiple ports within the SRS resource need to be transmitted simultaneously within a single symbol], SRS ports 0,2,4,6 and SRS ports 1,3,5,7 use different RF chains. To avoid RF crossing the hinge, SRS ports (0,2,4,6) and SRS ports (1,3,5,7) are located on different panels of the foldable mobile phone. That is, the two port groups of the two receivers are SRS ports (0,2,4,6) and SRS ports (1,3,5,7).

[0119] The association between CSI-RS and Layer / CW needs to be re-examined using novel SRS port grouping for low-complexity multi-panel UEs.

[0120] When 'cri-RI-CQI' is set and non-PMI-PortIndication is set, the association between CSI-RS and Layer / CW is set to RRC based on the gNB implementation. Therefore, there is no problem.

[0121] When 'cri-RI-CQI' is configured and non-PMI-PortIndication is not configured, the CSI-RS port index {0,1,...,v-1} is associated with rank v using the defined rules. In this case, an error case may occur where the same layer is mapped to two groups / panels. In the example in Figure 2, the layer from CSI-RS port 2 is mapped to SRS port group #1 at rank 5 and to SRS port group #0 at rank 6.

[0122] Thus, the relationship between CSI-RS and Layer / CW has not been adequately considered. Failure to adequately consider such a relationship may lead to a decrease in communication quality and throughput.

[0123] Therefore, the inventors investigated methods for using SRS and conceived the following embodiments.

[0124] The embodiments of this disclosure will be described in detail below with reference to the drawings. Each wireless communication method according to the embodiments may be applied individually or in combination.

[0125] (Various substitutions) In this disclosure, words enclosed in parentheses () may indicate an explanation of the preceding word (e.g., an explanation of spelling), a paraphrase, a specific example, or supplementary explanation. Also, in this disclosure, words enclosed in square brackets [] may be interpreted as part of the overall meaning of the text, or they may be interpreted as being excluded (ignored). Note that parentheses () and square brackets [] may be used for purposes / meanings other than those described above.

[0126] In this disclosure, "A / B" and "at least one of A and B" may be interpreted as mutually exclusive. In this disclosure, "A / B / C" may mean "at least one of A, B, and C".

[0127] In this disclosure, terms such as notice, activate, deactivate, indicate (or specify), select, configure, update, and determine may be interpreted interchangeably. In this disclosure, terms such as support, control, controllable, operate, and capable of operating may be interpreted interchangeably.

[0128] In this disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher-layer parameters, fields, Information Elements (IE), settings, etc., may be interpreted interchangeably. In this disclosure, Medium Access Control elements (MAC Control Elements (CE)), update commands, activation / deactivation commands, etc., may be interpreted interchangeably.

[0129] In this disclosure, the upper layer signaling may be any or a combination thereof, such as Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and other messages (e.g., messages from the core network, such as positioning protocol messages (e.g., NR Positioning Protocol A (NRPPPa) / LTE Positioning Protocol (LPP)) messages).

[0130] In this disclosure, MAC signaling may include, for example, MAC Control Elements (MAC CEs) and MAC Protocol Data Units (PDUs). Broadcast information may include, for example, Master Information Blocks (MIBs), System Information Blocks (SIBs), Remaining Minimum System Information (RMSIs), and Other System Information (OSIs).

[0131] In this disclosure, physical layer signaling may include, for example, Downlink Control Information (DCI) and Uplink Control Information (UCI).

[0132] In this disclosure, ceil(x), ceiling function, and ceiling function may be interpreted as interchangeable. In this disclosure, floor(x), floor function, and floor function may be interpreted as interchangeable. In this disclosure, sqrt(x), square root of x, and root x may be interpreted as interchangeable. In this disclosure, x mod y, mod(x, y), mod function, and modulo operation may be interpreted as interchangeable. In this disclosure, Σ i=M M+N-1 f(i), Σ i=M M+N-1 f i f(i) or f over i = M, M+1, ..., M+N-1 i The sum of f(M) + f(M+1) + ... + f(M+N-1), f M +f M+1 +...+f M+N-1 , can be read interchangeably. C(n,k) is the number of combinations of choosing k values ​​from n values ​​(combinatorial coefficient), binomial coefficients, n Ck , C n k , may be interpreted as mutually exclusive. In this disclosure, x / / y and floor(x / y) may be interpreted as mutually exclusive.

[0133] In this disclosure, A b The notations A_b, Ab, and A with a b placed to the lower right may be interpreted as interchangeable. In this disclosure, A c The notation A^c, with a c superscripted above A, may be interpreted as interchangeable. In this disclosure, A b c The notation A_b^c, where b is placed to the lower right of A and c is placed to the upper right of A, may be interpreted as being interchangeable. In this disclosure, x ~ x may be represented by placing a ~ above x, or it may be called x tilde. In this disclosure, x - x may be represented by placing a hyphen above it, or it may be called an x-bar. In this disclosure, x ＾ This can also be represented by placing a caret (^) above x, or it may be called an x-hat.

[0134] In this disclosure, FR may be at least one of FR1, FR2, FR2-1, FR2-2, FR3, subterahertz, and terahertz. In this disclosure, the frequency range corresponding to FR1 may be 410–7125 MHz. In this disclosure, FR2 may include FR2-1 and FR2-2, the frequency range corresponding to FR2-1 may be 24250–52600 MHz, and the frequency range corresponding to FR2-1 may be 52600–71000 MHz.

[0135] In this disclosure, the following abbreviations may be used: ◆FDM: frequency division multiplexing ◆TDM: time division multiplexing ◆CDM: spatial division multiplexing

[0136] In this disclosure, the terms "indicate," "report," and "select" may be interpreted as interchangeable.

[0137] In this disclosure, CW and TB may be interpreted as mutually exclusive. If both TB1 and TB2 are valid, TB1 and TB2 may be mapped to CW0 and TB1, respectively. If only one TB is valid, that TB may be mapped to the first CW.

[0138] In this disclosure, port #i, port index, port number, and port ID may be interpreted as interchangeable.

[0139] In this disclosure, port index i, antenna port index p=3000+i for CSI-RS, and antenna port index p=1000+i for PDSCH may be interpreted as interchangeable.

[0140] In this disclosure, SRS port index i=0,1,... and SRS port index p=1000+i=1000,1001,... may be interpreted as mutually interchangeable.

[0141] In this disclosure, the terms "[UE] panel" and "[SRS port group]" may be interpreted interchangeably. In other words, multiple antenna ports (multiple antennas) included in one SRS port group may correspond to one "[UE] panel."

[0142] In this disclosure, 8Tx, 6Tx, transmission using a rank greater than 4, transmission using more than 4 antennas (antenna ports), and dual (2) CW transmission may be interpreted as mutually exclusive. In this disclosure, 8Tx, transmission using rank 8 (8 layers), and transmission using 8 antennas (antenna ports) may be interpreted as mutually exclusive. In this disclosure, 6Tx, transmission using rank 6 (6 layers), and transmission using 6 antennas (antenna ports) may be interpreted as mutually exclusive. In this disclosure, Tx, transmit, PUSCH, and SRS may be interpreted as mutually exclusive.

[0143] In this disclosure, nRx, n Rx, reception using n Rx antennas [ports], and reception using rank n (n layers) may be interpreted as mutually exclusive.

[0144] In this disclosure, the terms [supporting more than four layers] [6 / 8Rx] low complexity receiver, low complexity multi-panel UE, low complexity receiver, and SRS port group may be interpreted as one another.

[0145] In this disclosure, Layer, CW, SRS port group, and PDSCH DMRS port may be interpreted as interchangeable.

[0146] (Wireless communication method) <Embodiment A1> Embodiment A1 relates to SRS port grouping (SRS port grouping, port grouping).

[0147] In the SRS configuration for antenna switching, if xTyR is set using y=6 or 8, multiple SRS ports may be divided into two port groups (SRS port groups). y may be greater than 4. The two port groups may be based on at least one of the following options:

[0148] ◆Option 1: The y SRS ports are divided into two port groups via an explicit RRC setting for grouping y ports (grouping multiple SRS resources corresponding to y ports).

[0149] ◆Option 2: If the grouping of y ports (grouping of multiple SRS resources corresponding to y ports) function is enabled by the new RRC parameter, the y SRS ports are divided into two port groups through the rules for that grouping. For example, the first y / 2 ports may belong to the first port group, and the second y / 2 ports may belong to the second port group. As in the example in Figure 3, if an 8-port SRS {port indices 1000, 1001, ..., 1007} ​​is considered, the SRS ports {1000, 1001, 1002, 1003} may belong to the first port group 0, and the SRS ports {1004, 1005, 1006, 1007} ​​may belong to the second port group 1. For example, multiple SRS ports transmitted within a single OFDM symbol may be considered / assumed to belong to the same port group. In the example in Figure 3, multiple SRS signals within port group 0 may be transmitted within the same OFDM symbol, while multiple SRS signals within port group 1 may be transmitted within a different OFDM symbol. Multiple SRS signals within a single port group may be transmitted via FDM / CDM. Multiple SRS signals from multiple port groups may be transmitted via TDM.

[0150] The y SRS ports may be obtained from one of the following options: ◆ Option 1: One SRS resource. ◆ Option 2: More than one SRS resource. For example, 2, 4, 6, or 8 SRS resources.

[0151] The y SRS ports may be obtained from one of the following options: ◆ Option 1: One SRS resource set. ◆ Option 2: More than one SRS resource set. For example, 2, 4, 6, or 8 SRS resources.

[0152] ◆Note 1: Multiple different SRS port groups may correspond to multiple different UE antenna groups / panels.

[0153] ◆Supplement 2: Embodiment A1 may be applied to cases where only CSI-RS resources using more than 32 ports are configured, or it may be applied to any case of CSI-RS resource configuration. Any case may include cases where CSI-RS resources using 32 or fewer ports are configured.

[0154] Embodiment A1 may be applied only to cases where the number of ranks to be set is greater than 4.

[0155] Variation: Port grouping in Embodiment A1 may also be supported for cases where y is less than 6 (y is 4 or less, for example, y=4).

[0156] In this disclosure, port group, SRS port group, group, set, and pool may be interpreted interchangeably. In this disclosure, SRS port grouping, port grouping, and grouping may be interpreted interchangeably.

[0157] According to Embodiment A1, multiple SRS ports can be appropriately grouped.

[0158] <Analysis> Embodiments A1 and A2 describe groupings / associations set by RRC or defined by specifications. However, UE implementations or UE migrations may support / adopt multiple groupings / associations in multiple cases.

[0159] <Embodiment B1> <<UE Capability of Port Grouping Schemes>> A UE may report one or more schemes ([SRS] port grouping schemes) within its UE capability reporting signaling. A port grouping scheme may indicate the association of multiple SRS ports (e.g., more than four SRS ports) with multiple groups (e.g., two groups). An 8Tx UE (a UE that supports 8Tx) may use / support / report / indicate at least one of the following schemes through its UE capability reporting signaling: ◆ Scheme 1 (First Grouping): Port grouping of ports [ID / number] {0,1,2,3}, {4,5,6,7} into two groups (Figure 4A). ◆ Scheme 2 (Second Grouping): Port grouping of ports [ID / number] {0,2,4,6}, {1,3,5,7} into two groups (Figure 4B). ◆Scheme 3 (Third Grouping): Port grouping into two groups: port [ID / number] {0,1,4,5} and {2,3,6,7} (Figure 4C).

[0160] ◆Note 1: The term "port" may also refer to the UE antenna port in Rx.

[0161] ◆Note 2: Of multiple schemes, one (for example, Scheme 1) may be defined as the basic scheme (basic function) in the UE capability, and the other schemes may be defined as optional capabilities. For example, if no schemes are expressed in a capability report for port grouping of a certain UE, the NW may recognize that the UE supports the basic scheme.

[0162] <<Port Grouping Scheme Configuration>> Depending on / reliance on UE capabilities, the NW may configure / instruct / update a single port grouping scheme for multiple SRS ports / resources to the UE [at once] via RRC IE / MAC CE / DCI. For example, instead of RRC IE configuring an arbitrary port grouping scheme, multiple port grouping schemes for SRS port grouping may be defined / configured (configured in RRC IE) / reported (UE capabilities), and one scheme from those multiple port grouping schemes may be configured.

[0163] ◆Note 3: For the N ports to be configured from M SRS resources for antenna switching, for grouping purposes, the first port from the first SRS resource may be considered the first port, the second port from the first SRS resource may be considered the second port, ..., and the last port from the Mth SRS resource may be considered the Nth port. In other words, the N SRS port IDs may be indexed in ascending order of the SRS resource IDs. Alternatively, the association between ports from SRS resources and UE antenna ports may be left to the UE implementation.

[0164] <<Application of Embodiment A1>> Details and precautions regarding the settings / instructions for SRS port grouping and the association of SRS port grouping with CW (DMRS port) in Embodiment A1 may also be applied to Embodiment B1.

[0165] According to Embodiment B1, the UE can perform appropriate SRS port grouping based on its SRS port grouping capabilities.

[0166] <Embodiment C1> In at least one of the cases where SRS port grouping capability is reported by the UE and SRS port grouping / low complexity reception is configured (RRC configured by the NW), if non-PMI reporting (reportQuantity set to 'cri-RI-CQI') is configured, the UE procedure may be based on at least one of several options x / variation y below.

[0167] <<Option 1>> It may be specified that "the UE assumes that non-PMI-PortIndication will always be set." It may also be specified that "the UE does not expect that non-PMI-PortIndication will not be set."

[0168] <<Option 2>> The UE does not need to have non-PMI-PortIndication set. If non-PMI-PortIndication is not provided / set, the UE procedure may be based on at least one of the following options 2-x.

[0169] <<<Option 2-1>>> For multiple ranks v, associations (first association [rules], mappings) between CSI-RS ports and layers (or between CSI-RS ports and CW, or between CSI-RS ports and SRS port groups, or between CSI-RS ports and PDSCH DMRS ports) may be defined in the specification. This option may be based on some of the following examples x.

[0170] ◆Example 1: As an association between CSI-RS ports and SRS port groups, CSI-RS ports {0, 1, 2, 3} are defined for SRS port group #0, and CSI-RS ports {4, 5, 6, 7} are defined for SRS port group #1. In this example, as shown in Figure 5, rank 5 may be defined as CSI-RS ports {0, 1} for SRS port group #0 or CW #0 or layers 1 to 2, and CSI-RS ports {4, 5, 6} for SRS port group #1 or CW #1 or layers 3 to 5. In this example, as shown in Figure 6, rank 6 may be defined as CSI-RS ports {0, 1, 2} for SRS port group #0 or CW #0 or layers 1 to 3, and CSI-RS ports {4, 5, 6} for SRS port group #1 or CW #1 or layers 4 to 6.

[0171] ◆Example 2: SRS port numbers within an SRS port group are associated with the same CSI-RS port number. If there are two SRS port groups, one with SRS ports {0, 2, 4, 6} and the other with SRS ports {1, 3, 5, 7}, then CSI-RS ports {0, 2, 4, 6} correspond to SRS port group #0 or CW#0, and CSI-RS ports {1, 3, 5, 7} correspond to SRS port group #1 or CW#1.

[0172] <<<Option 2-2>>> For multiple rank v cases, the association (mapping) between CSI-RS ports and layers (or between CSI-RS ports and CW, or between CSI-RS ports and SRS port groups, or between CSI-RS ports and PDSCH DMRS ports) may be RRC configured by new parameters. This option may be based on several examples x below.

[0173] ◆Example 1: There may be one association that applies to all rank cases (for example, ranks 5 through 8).

[0174] ◆Example 2: There may be different associations for each rank case.

[0175] <<Variation 1>> One or more associations may be supported by the NW / UE. One or more associations may be configured by the NW via RRC. One or more associations may be reported by UE capability signaling.

[0176] <<Variation 2>> Signaling / reporting of UE capability for Option 1 / 2 may be introduced.

[0177] According to this embodiment, in non-PMI reporting, the UE can appropriately determine the association between the CSI-RS port and the Layer / CW / SRS port group / PDSCH DMRS port.

[0178] <Embodiment C2> As in Embodiment A1, the grouping of y ports (0, 1, ..., y-1) of the SRS may be defined in the specification or configured in RRC. The specification may define a mapping rule for when those y ports come from at least one of more than one SRS resource and more than one SRS resource set.

[0179] At least one of the following options x may be applied to the grouping rules / methods / schemes in Embodiment A1 / Embodiment B1.

[0180] <<Option 1>> The y ports may be indexed in the order of the first SRS resource set, the second SRS resource set, and so on. The y ports may be indexed in the order of the SRS resource set IDs.

[0181] This option may be based on the following example.

[0182] ◆Example: As shown in Figure 7, when the defined rules are applied to y = 8 ports and 2 SRS resource sets, one or more SRS resources in the first SRS resource set correspond to port indices 0-3, and one or more SRS resources in the second SRS resource set correspond to port indices 4-7. If there are multiple SRS resources in one SRS resource set, the ports are indexed in the order of the first SRS resource, the second SRS resource, and so on within that SRS resource set.

[0183] <<Option 2>> The y ports may be indexed in the following order: the first SRS resource in the first SRS resource set, the first SRS resource in the second SRS resource set, ..., the second SRS resource in the first SRS resource set, the second SRS resource in the second SRS resource set, ... The y ports may be indexed in order of SRS resource ID, and for the same SRS resource ID, in order of SRS resource set ID.

[0184] This option may be based on the following example.

[0185] ◆Example: As shown in Figure 8, when the defined rules are applied to y = 8 ports, 2 SRS resource sets, and 2 SRS resources in each SRS resource set, the 2 SRS resources in the first SRS resource set correspond to port indices 0-1 and 4-5, respectively, and the 2 SRS resources in the second SRS resource set correspond to port indices 2-3 and 6-7, respectively.

[0186] (Supplement) <<Notification of Information to UE>> In the embodiments described above, notification of any information from the Network (NW) (e.g., Base Station (BS)) to the UE (in other words, reception of any information from the BS at the UE) may be performed using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE, RRC messages, LTE positioning protocol (LPP) messages), specific signals / channels (e.g., DCI, PDCCH, PDSCH, reference signals), or a combination thereof.

[0187] When the above notification is made by a MAC CE, the MAC CE may be identified by the inclusion of a new Logical Channel ID (LCID) not defined in existing standards in the MAC subheader. The MAC CE may be an extension of an existing MAC CE. For example, the MAC CE may introduce a new octet into an existing MAC CE.

[0188] If the above notification is made by DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble the Cyclic Redundancy Check (CRC) bits assigned to the DCI, or the format of the DCI. The specific field may be an existing DCI field or a new DCI field. The RNTI may be an existing RNTI or a new RNTI. The format of the DCI may be an existing DCI format or a new DCI format.

[0189] Furthermore, notification of any information to the UE in the above-described embodiment may be periodic, semi-persistent (triggered by the UE or gNB), or aperiodic (triggered by the UE or gNB).

[0190] In the embodiments described above, the UE may receive information from the NW of at least one of the following QCL rules: ◆ QCL Type A ◆ QCL Type B ◆ QCL Type C ◆ QCL Type D

[0191] In the embodiments described above, the QCL source RS for each QCL type may be at least one of the following RSs: ◆SSB ◆CSI-RS with / without repetition ◆TRS ◆DMRS for PDCCH / PDSCH

[0192] In the embodiments described above, information from the network may be set / instructed by the following methods: ◆ Common to multiple UEs, or individual to a UE ◆ Cell-specific, or common to multiple cells ◆ Per UE / Per CC / Per BWP / Per band / Per cell / Per cell group (CG)

[0193] <<Notification of Information from UE>> Notification of any information from the UE to the NW in the embodiments described above (in other words, transmission / reporting of any information from the UE to the BS) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE, RRC messages, LPP messages), specific signals / channels (e.g., UCI, PUCCH, PUSCH, PRACH, reference signals), or a combination thereof.

[0194] When the above notification is made by a MAC CE, the MAC CE may be identified by the inclusion of a new LCID not specified in existing standards in the MAC subheader. The MAC CE may be an extension of an existing MAC CE. For example, the MAC CE may introduce a new octet into an existing MAC CE.

[0195] If the above notice is made by the UCI, the notice may be transmitted using PUCCH or PUSCH.

[0196] Furthermore, the notification of any information from the UE in the above-described embodiments may be periodic, semi-persistent (triggered by the UE or gNB), or aperiodic (triggered by the UE or gNB).

[0197] <<Regarding the application of each embodiment>> In UE / BS, specific (one or more) processes / operations / controls / assumptions / information for at least one of the embodiments described above may be applied (or used) if any or more of the following conditions are met: ◆ A higher-layer parameter indicating the specific process / operation / control / assumption / information is set; ◆ The specific process / operation / control / assumption / information is determined based on the relevant higher-layer parameter; ◆ The specific process / operation / control / assumption / information is instructed / specified / activated / triggered by MAC CE / DCI / UCI / Resource / Channel / RS; ◆ A specific UE capability indicating (or related to) the specific process / operation / control / assumption / information is reported or supported; ◆ The application of the specific process / operation / control / assumption / information is determined based on specific conditions.

[0198] The above-mentioned specific UE capabilities may represent at least one of the following: ◆ Supporting the above-mentioned specific processing / operation / control / assumption / information; ◆ The capability of each embodiment; ◆ The capability of each option in each embodiment, or the capability of a combination of multiple options in each embodiment; ◆ The capability of each choice in each embodiment, or the capability of a combination of multiple choices in each embodiment.

[0199] Furthermore, the above-mentioned specific UE capability may be a capability that applies across all frequencies (commonly regardless of frequency), a capability per frequency (e.g., one or a combination thereof, such as cell, band, band combination, BWP, component carrier, etc.), a capability per frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), a capability per subcarrier spacing (SCS), or a capability per feature set (FS) or feature set per component-carrier (FSPC).

[0200] Furthermore, the specific UE capabilities described above may be capabilities that apply across all duplexing schemes (common to all duplexing schemes regardless of the duplexing scheme), or they may be capabilities specific to each duplexing scheme (e.g., Time Division Duplex (TDD), Frequency Division Duplex (FDD)).

[0201] If the above conditions are not met, UE / BS may follow the behavior specified in existing 3GPP releases.

[0202] Information regarding whether one or more of the above embodiments / options / choices / examples apply / are used, or which of the above embodiments / options / choices / examples apply / are used, may be based on several of the following methods: ◆ The information is set by one or more higher layer parameters / RRC IEs. ◆ The information is determined by one or more relevant higher layer parameters / RRC IEs. ◆ The information is indicated by MAC CE / DCI. ◆ The information is determined based on one or more UE capabilities. ◆ The information is described / defined in the specification. ◆ The information is based on conditions described / defined in the specification. ◆ The information is determined by a combination of several of the above methods. For example, the information is determined by the setting / indication of higher layer parameters / MAC CE / DCIs and reported by UE capabilities.

[0203] The above multiple embodiments / options / choices may be combined into a single embodiment / option / choice.

[0204] In the embodiments described above, the measured RS may be a QCL source RS in an active TCI state / indicated / unified TCI state.

[0205] (Note) The following inventions are added with respect to one embodiment of the present disclosure. [Note 1] A terminal (e.g., user terminal 20) having: a receiving unit (e.g., transmitting / receiving unit 220) that receives a setting (e.g., SRS setting) of one or more SRS resource sets having an antenna switching application and using a plurality of sounding reference signal (SRS) ports; and a control unit (e.g., control unit 210) that applies, based on the setting, at least one of a first association from a plurality of layers, a plurality of codewords, a plurality of SRS port groups, and a plurality of demodulated reference signal (DMRS) ports for physical downlink shared channels to a plurality of channel state information (CSI)-reference signal (RS) ports and a second association from the one or more SRS resource sets to a plurality of SRS port numbers. [Note 2] The terminal according to Note 1, wherein in at least one of the cases in which the terminal reports the capability of SRS port grouping and the case in which SRS port grouping (or low complexity reception) is configured, a CSI report that does not include a precoding matrix indicator (PMI) is configured, and the higher-layer parameters for port indication for calculations for non-PMI are configured. [Note 3] The terminal according to Note 1 or Note 2, wherein in at least one of the cases in which the terminal reports the capability of SRS port grouping and the case in which SRS port grouping is configured, a CSI report that does not include a precoding matrix indicator (PMI) is configured, and the higher-layer parameters for port indication for calculations for non-PMI are not configured, the control unit applies the first association to the CSI report. [Note 4] The terminal according to any one of Notes 1 to 3, wherein the control unit determines the numbers of the plurality of SRS ports for at least one of the one or more SRS resource sets and the plurality of SRS resources within the one or more SRS resource sets, based on the second association.

[0206] (Wireless Communication System) The configuration of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any of the wireless communication methods according to the above embodiments of this disclosure, or a combination thereof.

[0207] Figure 9 shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 (which may also be simply called system 1) may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc., as specified by the Third Generation Partnership Project (3GPP).

[0208] Furthermore, the wireless communication system 1 may support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0209] In EN-DC, the LTE (E-UTRA) base station (eNB) is the Master Node (MN), and the NR base station (gNB) is the Secondary Node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0210] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both MN and SN are NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0211] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) located within the macrocell C1 that form a small cell C2 that is narrower than the macrocell C1. User terminals 20 may be located within at least one cell. The arrangement, number, shape, size, etc., of each cell and user terminal 20 are not limited to the configuration shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, they will be collectively referred to as base station 10.

[0212] The wireless communication system 1 may utilize Multi Input Multi Output (MIMO). For example, one cell may be formed by one antenna / base station 10, or by multiple antennas / base stations 10. One [virtual] cell (which may be called a supercell, for example) may be composed of multiple [virtual] cells (which may be called subcells, for example). A supercell may correspond to a cell with a fixed physical range, and a subcell may correspond to a cell whose physical range fluctuates quasi-statically / dynamically. In this case, the wireless communication system 1 may be called a cell-free system.

[0213] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of Carrier Aggregation (CA) using multiple Component Carriers (CC) and Dual Connectivity (DC).

[0214] Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). A macrocell C1 may be included in FR1, and a small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz. Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may be in a frequency band higher than FR2.

[0215] Furthermore, the user terminal 20 may communicate in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0216] Multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with Common Public Radio Interface (CPRI), X2 / Xn interface, etc.) or wireless (e.g., NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is the upstream station, may be called an Integrated Access Backhaul (IAB) donor, and base station 12, which is the relay station, may be called an IAB node.

[0217] Base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include at least one of the following: Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0218] The core network 30 may include network functions (NF) such as User Plane Function (UPF), Access and Mobility Management Function (AMF), Session Management Function (SMF), Unified Data Management (UDM), Application Function (AF), Data Network (DN), Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM). Multiple functions may be provided by a single network node. Furthermore, communication with an external network (e.g., the Internet) may occur via the DN.

[0219] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0220] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access scheme may be used. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-OFDM), etc., may be used in at least one of the downlink (DL) and uplink (UL).

[0221] The wireless access method may also be called a waveform. In wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0222] In the wireless communication system 1, a Physical Downlink Shared Channel (PDSCH), a Broadcast Channel (PBCH), or a Physical Downlink Control Channel (PDCCH) may be used as the downlink channel, which is shared by each user terminal 20.

[0223] Furthermore, in the wireless communication system 1, the uplink channel may include a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), or the like, all of which are shared by each user terminal 20.

[0224] User data, higher-layer control information, and System Information Blocks (SIBs) are transmitted via PDSCH. User data and higher-layer control information may also be transmitted via PUSCH. Furthermore, Master Information Blocks (MIBs) may be transmitted via PBCH.

[0225] Lower-layer control information may be transmitted by PDCCH. The lower-layer control information may include, for example, Downlink Control Information (DCI) which includes scheduling information for at least one of PDSCH and PUSCH.

[0226] Furthermore, the DCI that schedules PDSCH may be called DL assignment, DL DCI, etc., and the DCI that schedules PUSCH may be called UL grant, UL DCI, etc. Furthermore, PDSCH may be read as DL data, and PUSCH may be read as UL data.

[0227] PDCCH detection may utilize a Control Resource Set (CORESET) and a search space. A CORESET corresponds to the resources used to search for DCIs. A search space corresponds to the search area and search method for PDCCH candidates. A single CORESET may be associated with one or more search spaces. A UE may monitor CORESETs associated with a given search space based on the search space configuration.

[0228] A single search space may correspond to one or more PDCCH candidates corresponding to aggregation levels. One or more search spaces may be referred to as a search space set. In this disclosure, "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," and "CORESET configuration" may be interpreted interchangeably.

[0229] PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgment information (for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). PRACH may transmit a random access preamble for establishing a connection with the cell.

[0230] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted from the names of various channels.

[0231] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc., may be transmitted. In the wireless communication system 1, the DL-RS may include a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc.

[0232] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, SS Block (SSB), etc. Note that SS, SSB, etc. may also be called reference signals.

[0233] Furthermore, in the wireless communication system 1, the uplink reference signal (UL-RS) may include a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. The DMRS may also be called a user-specific reference signal (UE-specific Reference Signal).

[0234] (Base Station) Figure 10 shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, the transmitting / receiving unit 120, the transmitting / receiving antenna 130, and the transmission line interface 140 may be provided.

[0235] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0236] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, control circuit, etc., as described based on common understanding in the technical field related to this disclosure.

[0237] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc., using the transmitting / receiving unit 120, transmitting / receiving antenna 130, and transmission path interface 140. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transmitting / receiving unit 120. The control unit 110 may also perform call processing of communication channels (setting, releasing, etc.), status management of the base station 10, management of wireless resources, etc.

[0238] The transmitting / receiving unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transmitting / receiving unit 120 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0239] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 1211 and an RF unit 122. The receiving unit may consist of a receiving processing unit 1212, an RF unit 122 and a measuring unit 123.

[0240] The transmitting and receiving antenna 130 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0241] The transmitting / receiving unit 120 may transmit the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 may also receive the uplink channel, uplink reference signal, etc.

[0242] The transmitting / receiving unit 120 may use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like to form at least one of the transmitting beam and the receiving beam.

[0243] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform processing on data and control information acquired from the control unit 110, for example, at the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (e.g., RLC retransmission control), and the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), to generate a bit sequence to be transmitted.

[0244] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform transmission processing on the bit sequence to be transmitted, such as channel coding (which may include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT) processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, and digital-to-analog conversion, and output a baseband signal.

[0245] The transmitting / receiving unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 130.

[0246] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 130.

[0247] The transmitting / receiving unit 120 (receiving processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0248] The transmitting / receiving unit 120 (measurement unit 123) may perform measurements related to the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may also measure received power (e.g., Reference Signal Received Power (RSRP)), reception quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0249] The transmission path interface 140 may send and receive signals (backhaul signaling) with devices included in the core network 30 (e.g., network nodes that provide NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0250] In this disclosure, the transmitting and receiving units of the base station 10 may consist of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0251] The base station 10 may be separated into three elements: a Radio Unit (RU), a Distributed Unit (DU), and a Central Unit (CU). For example, the RU may implement RF processing (digital beamforming, digital-to-analog conversion, analog beamforming, etc.) and lower-level physical layer functions (precoding, IFFT, FFT, etc.). The DU may implement higher-level physical layer functions (coding to resource element mapping, etc.), MAC layer functions, and RLC layer functions. The CU may implement PDCP layer, Service Data Adaptation Protocol (SDAP) layer, and RRC layer functions.

[0252] In this disclosure, base station 10 may include a single device that implements all the functions of RU, DU, and CU, or it may include multiple devices that each implement some of the functions of RU, DU, and CU and are connected to each other. In this disclosure, base station 10 may be interpreted as RU / DU / CU.

[0253] The transmitting / receiving unit 120 may transmit a configuration of one or more SRS resource sets that have antenna switching applications and use multiple sounding reference signal (SRS) ports. Based on the configuration, the control unit 110 may apply at least one of the following: a first association from at least one of multiple layers, multiple codewords, multiple SRS port groups, and multiple demodulated reference signal (DMRS) ports for physical downlink shared channels to multiple channel state information (CSI)-reference signal (RS) ports; and a second association from the one or more SRS resource sets to multiple SRS port numbers.

[0254] (User Terminal) Figure 11 shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that one or more of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0255] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0256] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., as described based on common understanding in the technical field related to this disclosure.

[0257] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc., using the transmitting / receiving unit 220 and the transmitting / receiving antenna 230. The control unit 210 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transmitting / receiving unit 220.

[0258] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0259] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may consist of a receiving processing unit 2212, an RF unit 222 and a measuring unit 223.

[0260] The transmitting and receiving antenna 230 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0261] The transmitting / receiving unit 220 may receive the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 220 may also transmit the uplink channel, uplink reference signal, etc.

[0262] The transmitting / receiving unit 220 may use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like to form at least one of the transmitting beam and the receiving beam.

[0263] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc., on data and control information acquired from the control unit 210 to generate a bit sequence to be transmitted.

[0264] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform transmission processing on the bit sequence to be transmitted, such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion, and output a baseband signal.

[0265] Whether or not to apply DFT processing may be based on the transform precoding settings. The transmitting / receiving unit 220 (transmission processing unit 2211) may perform DFT processing as part of the transmission process to transmit a channel (for example, PUSCH) using a DFT-s-OFDM waveform if transform precoding is enabled for that channel, or it may not perform DFT processing as part of the transmission process if transform precoding is not enabled for that channel.

[0266] The transmitting / receiving unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 230.

[0267] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0268] The transmitting / receiving unit 220 (receiving processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0269] The transmitting / receiving unit 220 (measuring unit 223) may perform measurements related to the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, etc., based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0270] The measurement unit 223 may derive channel measurements for CSI calculation based on channel measurement resources. Channel measurement resources may be, for example, Non Zero Power (NZP) CSI-RS resources. The measurement unit 223 may also derive interference measurements for CSI calculation based on interference measurement resources. Interference measurement resources may be at least one of the following: NZP CSI-RS resources for interference measurement, CSI-Interference Measurement (IM) resources, etc. CSI-IM may also be called CSI-Interference Management (IM), and may be interpreted interchangeably with Zero Power (ZP) CSI-RS. In this disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc., may be interpreted interchangeably.

[0271] In this disclosure, the transmitting unit and receiving unit of the user terminal 20 may be composed of at least one of a transmitting / receiving unit 220 and a transmitting / receiving antenna 230.

[0272] (Hardware Configuration) The block diagram used in the description of the above embodiment shows functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining the above one device or the above multiple devices with software.

[0273] Here, functions include, but are not limited to, judgment, decision, determination, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission may be called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0274] For example, a base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 12 is a diagram showing an example of the hardware configuration of a base station and user terminal according to one embodiment. The base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0275] In this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or it may be configured without some of the devices.

[0276] For example, although only one processor 1001 is shown in the diagram, there may be multiple processors. Furthermore, the processing may be performed by one processor, or it may be performed by two or more processors simultaneously, sequentially, or by other means. Note that the processor 1001 may be implemented using one or more chips.

[0277] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations and control communication via the communication device 1004, or control at least one of reading and writing data in the memory 1002 and storage 1003.

[0278] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic units, registers, etc. For example, at least a part of the control unit 110 (210) and the transmitting / receiving unit 120 (220) described above may be implemented by the processor 1001.

[0279] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be implemented similarly.

[0280] The memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be called a register, cache, or main memory. The memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of the present disclosure.

[0281] The storage 1003 is a computer-readable recording medium and may consist of at least one of the following: a flexible disk, a floppy disk, a magneto-optical disk (e.g., a Compact Disk (Compact Disc ROM (CD-ROM)), a Digital Use Disk, a Blu-ray (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. The storage 1003 may also be called an auxiliary storage device.

[0282] The communication device 1004 is hardware (transmitting / receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitting / receiving unit 120 (220), transmitting / receiving antenna 130 (230), etc., may be implemented by the communication device 1004. The transmitting / receiving unit 120 (220) may be implemented with physically or logically separated transmitting unit 120a (220a) and receiving unit 120b (220b).

[0283] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, light-emitting diode (LED) lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0284] Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0285] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and some or all of each functional block may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0286] Furthermore, devices included in the core network 30 (for example, network nodes that provide NF) may also be implemented using the functional block / hardware configuration described above.

[0287] (Variations) Terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol and signal (signal or signaling) may be used interchangeably. Also, a signal may be a message. A reference signal may be abbreviated as RS and may be called a pilot, pilot signal, etc., depending on the applicable standard. Also, a component carrier (CC) may be called a cell, frequency carrier, carrier frequency, etc.

[0288] A wireless frame may consist of one or more periods (frames) in the time domain. Each of these periods (frames) constituting a wireless frame may be called a subframe. Furthermore, a subframe may consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0289] Here, the neurology may be communication parameters applied to at least one of the transmission and reception of a signal or channel. The neurology may be, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, and specific windowing processes performed by the transceiver in the time domain.

[0290] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). Alternatively, a slot may be a time unit based on neurology.

[0291] A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. Minislots may also be called subslots. Minislots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using minislots may be called a PDSCH (PUSCH) mapping type B.

[0292] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Wireless frames, subframes, slots, minislots, and symbols may each be referred to by different names. Furthermore, the units of time such as frames, subframes, slots, minislots, and symbols in this disclosure may be interpreted as interchangeable.

[0293] For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, and one slot or one mini-slot may be called a TTI. In other words, at least one of a subframe and a TTI may be a subframe in existing LTE (1 ms), a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing a TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0294] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0295] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the actual time interval (e.g., number of symbols) in which the transport block, code block, code word, etc. are mapped may be shorter than the TTI.

[0296] Furthermore, if one slot or one mini-slot is referred to as a TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit for scheduling. In addition, the number of slots (number of mini-slots) that constitute this minimum time unit for scheduling may be controlled.

[0297] A TTI with a time length of 1 ms may be called a normal TTI, long TTI, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, mini slot, sub slot, slot, etc.

[0298] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0299] A Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0300] Furthermore, an RB may contain one or more symbols in the time domain and may have the length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc., may each consist of one or more resource blocks.

[0301] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0302] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0303] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. These common RBs may be identified by an index of the RBs relative to a common reference point of the carrier. The PRBs may be defined and numbered within a given BWP.

[0304] A BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL). One or more BWPs may be configured within a single carrier for a UE.

[0305] At least one of the configured BWPs may be active, and the UE does not need to assume that it will transmit or receive a predetermined signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0306] The structures of wireless frames, subframes, slots, minislots, and symbols described above are merely examples. For example, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within the TTI can be varied in various ways.

[0307] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or corresponding other information. For example, wireless resources may be indicated by a predetermined index.

[0308] The names used for parameters and other elements in this disclosure are not restrictive in any way. Furthermore, mathematical formulas and other elements using these parameters may differ from those expressly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0309] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0310] Furthermore, information, signals, etc., can be output from upper layers to lower layers and from lower layers to upper layers, or to at least one of the two. Information, signals, etc., may also be input and output via multiple network nodes.

[0311] Input and output information and signals may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information and signals may be overwritten, updated, or appended to. Output information and signals may be deleted. Input information and signals may be transmitted to other devices.

[0312] Any information described in this disclosure (e.g., variables, constants, parameters) may be communicated from any first device (e.g., UE / base station) to any second device (e.g., base station / UE) that indicates / specifies (or relates to) the value of such any information, even if not specifically stated in the embodiments described above.

[0313] Information notification is not limited to the embodiments described herein and may be carried out by other means. For example, information notification in this disclosure may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0314] Physical layer signaling may also be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. RRC signaling may also be called RRC messages, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc. MAC signaling may also be communicated using, for example, MAC Control Elements (CEs).

[0315] Furthermore, notification of the specified information (for example, notification that "X is the case") is not limited to explicit notification, but may also be made implicitly (for example, by not notifying the specified information or by notifying other information).

[0316] The determination may be made by a value represented by one bit (0 or 1), by a boolean value represented as true or false, or by a numerical comparison (for example, a comparison with a predetermined value).

[0317] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0318] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0319] The terms “system” and “network” as used in this disclosure may be used interchangeably. “Network” may also mean the equipment included in the network (e.g., base stations).

[0320] In this disclosure, terms such as “precoding,” “precoder,” “weight (precoding weight),” “quasi-co-location (QCL),” “transmission configuration indication state (TCI state),” “spatial relation,” “spatial domain filter,” “transmit power,” “phase rotation,” “antenna port,” “layer,” “number of layers,” “rank,” “resource,” “resource set,” “beam,” “beam width,” “beam angle,” “antenna,” “antenna element,” “panel,” “UE panel,” “transmitting entity,” and “receiving entity” may be used interchangeably.

[0321] In this disclosure, "antenna port" may be interpreted interchangeably with "antenna port for any signal / channel" (e.g., a Demodulation Reference Signal (DMRS) port). In this disclosure, "resource" may be interpreted interchangeably with "resource for any signal / channel" (e.g., a reference signal resource, an SRS resource, etc.). Resources may include time / frequency / code / spatial / power resources. Furthermore, a spatial domain transmit filter may include at least one of a spatial domain transmit filter and a spatial domain receive filter.

[0322] The above group may include, for example, at least one of the following: a spatial relationship group, a code division multiplexing (CDM) group, a reference signal (RS) group, a control resource set (CORESET) group, a PUCCH group, an antenna port group (e.g., a DMRS port group), a layer group, a resource group, a beam group, an antenna group, or a panel group.

[0323] Furthermore, in this disclosure, terms such as beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, Codeword (CW), Transport Block (TB), and RS may be interpreted interchangeably.

[0324] Furthermore, in this disclosure, TCI state, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, joint TCI state, etc., may be interpreted interchangeably.

[0325] Furthermore, in this disclosure, terms such as "QCL," "QCL assumption," "QCL relationship," "QCL type information," "QCL property / properties," "specific QCL type (e.g., Type A, Type D) properties," and "specific QCL type (e.g., Type A, Type D)" may be interpreted interchangeably.

[0326] In this disclosure, terms such as index, identifier (ID), indicator, indication, and resource ID may be interpreted interchangeably. In this disclosure, terms such as sequence, list, set, group, cluster, subset may be interpreted interchangeably.

[0327] Furthermore, the spatial relationship information Identifier (ID) (TCI state ID) and spatial relationship information (TCI state) may be interpreted as mutually exclusive. "Spatial relationship information (TCI state)" may be interpreted as mutually exclusive as "a set of spatial relationship information (TCI state)," "one or more pieces of spatial relationship information," etc. TCI state and TCI may be interpreted as mutually exclusive. Spatial relationship information and spatial relationship may be interpreted as mutually exclusive.

[0328] In this disclosure, terms such as “Base Station (BS),” “wireless base station,” “fixed station,” “NodeB,” “eNB (eNodeB),” “gNB (gNodeB),” “access point,” “Transmission Point (TP),” “Reception Point (RP),” “Transmission / Reception Point (TRP),” “panel,” “cell,” “sector,” “cell group,” “carrier,” and “component carrier” may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0329] A base station may house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station may be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0330] In this disclosure, the transmission of information by a base station to a terminal may be interpreted as the base station instructing the terminal to perform a control / operation based on said information.

[0331] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0332] A mobile station may also be called a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate term.

[0333] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may also be a device mounted on a moving object, the moving object itself, etc.

[0334] The term "mobile object" refers to any movable object, regardless of its speed, and naturally includes cases where the mobile object is stationary. Examples of such mobile objects include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and items carried on them. Furthermore, such mobile objects may be autonomously driven objects operating based on operational commands.

[0335] The mobile entity may be a vehicle (e.g., a car, an airplane), an unmanned mobile entity (e.g., a drone, an autonomous vehicle), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0336] Figure 13 shows an example of a vehicle according to one embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, a pneumatic pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0337] The drive unit 41 consists of, for example, at least one of an engine, a motor, or an engine-motor hybrid. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

[0338] The electronic control unit 49 consists of a microprocessor 61, memory (ROM, RAM) 62, and communication ports (e.g., input / output (IO) ports) 63. Signals from various sensors 50-58 installed in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0339] Signals from various sensors 50-58 include current signals from current sensor 50 for sensing motor current, rotational speed signals of front wheels 46 / rear wheels 47 acquired by rotational speed sensor 51, air pressure signals of front wheels 46 / rear wheels 47 acquired by air pressure sensor 52, vehicle speed signals acquired by vehicle speed sensor 53, acceleration signals acquired by acceleration sensor 54, accelerator pedal depression amount signals acquired by accelerator pedal sensor 55, brake pedal depression amount signals acquired by brake pedal sensor 56, operation signals of shift lever 45 acquired by shift lever sensor 57, and detection signals acquired by object detection sensor 58 for detecting obstacles, vehicles, pedestrians, etc.

[0340] The information service unit 59 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, display, television, and radio, and one or more ECUs that control these devices. The information service unit 59 uses information acquired from external devices via a communication module 60 or the like to provide various types of information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40.

[0341] The information service unit 59 may include input devices that accept input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) or output devices that perform output to the outside (e.g., display, speaker, LED lamp, touch panel, etc.).

[0342] The driver assistance system unit 64 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Unit (IMU), Inertial Navigation System (INS)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driver assistance functions or autonomous driving functions.

[0343] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 sends and receives data (information) via the communication port 63 to the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58 provided in the vehicle 40.

[0344] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Alternatively, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 (it may function as at least one of the base station 10 and the user terminal 20).

[0345] The communication module 60 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 59. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include the information based on the above input.

[0346] The communication module 60 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 59 installed in the vehicle. The information service unit 59 may also be called an output unit, which outputs information (for example, it outputs information to devices such as displays and speakers based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 60).

[0347] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, various sensors 50-58, etc., which are provided in the vehicle 40.

[0348] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may have the functions of the base station 10 described above. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, uplink channel, downlink channel, etc., may be interpreted as sidelink channel.

[0349] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station 10 may be configured to have the same functions as the user terminal 20 described above.

[0350] In this disclosure, operations performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes having base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0351] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between as needed during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be rearranged in order, provided they are consistent. For example, the methods described in this disclosure present various step elements using exemplary order and are not limited to the specific order presented.

[0352] Each aspect / embodiment described in this disclosure is Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (where x is, for example, an integer or decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM®), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), IEEE 802.20, systems utilizing Ultra-WideBand (UWB), Bluetooth®, or other appropriate wireless communication methods, and next-generation systems extended, modified, created, or defined based thereon may also be applied. Furthermore, multiple systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

[0353] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0354] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, the references to the first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.

[0355] The term “determining” as used in this disclosure may encompass a wide variety of actions. For example, “determining” may be considered to mean judging, calculating, computing, processing, deriving, investigating, looking up, searching, or inquiring (e.g., searching in tables, databases, or other data structures), ascertaining, etc.

[0356] Furthermore, "judgment (decision)" may be considered as "judging (deciding)" things like receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory).

[0357] Furthermore, “judgment (decision)” may be considered as “judgment (decision)” of resolving, selecting, choosing, establishing, comparing, etc. In other words, “judgment (decision)” may be considered as “judgment (decision)” of some action. In this disclosure, “judgment (decision)” may be interpreted as mutually interchangeable with the actions described above.

[0358] Furthermore, in this disclosure, “determine / determining” may be interpreted as “assume / assuming,” “expect / expecting,” or “consider / considering.” In addition, in this disclosure, “not expecting to do…” may be interpreted as “expecting not to do….”

[0359] In this disclosure, "expect" may be rephrased as "be expected." For example, "expect(s) ..." (where "..." may be expressed as a that clause, an infinitive, etc.) may be rephrased as "be expected ..." or "do (the verb without "to" if "..." is an infinitive)." Similarly, "does not expect ..." may be rephrased as "be not expected ..." or "do not (the verb without "to" if "..." is an infinitive)." Furthermore, "An apparatus A is not expected ..." may be rephrased as "An apparatus B other than apparatus A does not expect ... from apparatus A" (for example, if apparatus A is a UE, apparatus B may be a base station).

[0360] The term "maximum transmit power" as used in this disclosure may mean the maximum transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0361] As used in this disclosure, the terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be replaced with “access.”

[0362] In this disclosure, when two elements are connected, they can be considered to be "connected" or "coupled" to each other using one or more wires, cables, printed electrical connections, etc., and, in some non-exclusive and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, and optical (both visible and invisible) domain.

[0363] In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combine" may be interpreted similarly to "different."

[0364] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0365] In this disclosure, if articles are added by translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0366] In this disclosure, "less than or equal to," "less than," "greater than or equal to," "more than," and "equal to" may be interpreted interchangeably. In addition, in this disclosure, words meaning "good," "bad," "big," "small," "high," "low," "early," "slow," "wide," and "narrow" may be interpreted interchangeably, not limited to the positive, comparative, and superlative degrees. In addition, in this disclosure, words meaning "good," "bad," "big," "small," "high," "low," "early," "slow," "wide," and "narrow" may be interpreted interchangeably, not limited to the positive, comparative, and superlative degrees, by adding "i-th" (where i is any integer) to the expression (for example, "highest" may be interpreted interchangeably with "i-th highest").

[0367] In this disclosure, "of," "for," "regarding," "related to," and "associated with" may be interpreted as being interchangeable.

[0368] In this disclosure, phrases such as "when A, B", "if A, then B", "B upon A", "B in response to A", "B based on A", "B during / while A", "B before A", "B at (the same time as) / on A", "B after A", "B since A", and "B until A" may be interchangeable. Furthermore, A, B, etc., may be replaced with appropriate expressions such as nouns, gerunds, or regular sentences depending on the context. The time difference between A and B may be approximately zero (immediately after or immediately before). Additionally, a time offset may be applied to the time when A occurs. For example, "A" may be interpreted as "before / after the time offset when A occurs". The time offset (e.g., one or more symbols / slots) may be predetermined or determined by the UE based on notified information.

[0369] In this disclosure, timing, time, duration, time instance, any unit of time (e.g., slot, subslot, symbol, subframe), period, occasion, resource, etc., may be interpreted interchangeably.

[0370] Although the invention described herein has been explained in detail above, it will be clear to those skilled in the art that the invention described herein is not limited to the embodiments described herein. The descriptions herein are illustrative and not intended to be restrictive in any way to the invention described herein.

[0371] This application is based on Japanese Patent Application No. 2024-174374, filed on October 3, 2024. All of its contents are included herein.

Claims

1. A terminal having a receiving unit that receives the settings of one or more SRS resource sets that have an antenna switching application and use multiple sounding reference signal (SRS) ports, and a control unit that, based on the settings, applies at least one of the following: a first association from at least one of multiple layers, multiple codewords, multiple SRS port groups, and multiple demodulated reference signal (DMRS) ports for physical downlink shared channels to multiple channel state information (CSI)-reference signal (RS) ports, and a second association from the one or more SRS resource sets to multiple SRS port numbers.

2. The terminal according to claim 1, wherein in at least one of the cases in which the terminal reports the capability of SRS port grouping and in the case in which SRS port grouping is configured, if a CSI report that does not include a precoding matrix indicator (PMI) is configured, the higher-layer parameters of the port indication for calculations for non-PMI are configured.

3. In at least one of the cases in which the terminal has reported the capability for SRS port grouping and in the case in which SRS port grouping is configured, if a CSI report that does not include a precoding matrix indicator (PMI) is configured and no higher-layer parameters for port indications for calculations for non-PMIs are configured, the control unit applies the first association to the CSI report, according to claim 1.

4. The terminal according to claim 1, wherein the control unit determines, based on the second association, the numbers of the plurality of SRS ports for at least one of the one or more SRS resource sets and the plurality of SRS resources within the one or more SRS resource sets.

5. A wireless communication method for a terminal, comprising: receiving a configuration of one or more SRS resource sets having an antenna switching application and using multiple sounding reference signal (SRS) ports; and applying, based on the configuration, at least one of a plurality of layers, a plurality of codewords, a plurality of SRS port groups, and a plurality of demodulated reference signal (DMRS) ports for physical downlink shared channels to a plurality of channel state information (CSI)-reference signal (RS) ports, and a second association from the one or more SRS resource sets to a plurality of SRS port numbers.

6. A base station having: a transmitting unit that transmits the settings of one or more SRS resource sets that have an antenna switching application and use multiple sounding reference signal (SRS) ports; and a control unit that, based on the settings, applies at least one of the following: a first association from at least one of multiple layers, multiple codewords, multiple SRS port groups, and multiple demodulated reference signal (DMRS) ports for physical downlink shared channels to multiple channel state information (CSI)-reference signal (RS) ports, and a second association from the one or more SRS resource sets to multiple SRS port numbers.

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