Terminal, radio communication method, and base station

Abstract

To appropriately use a SRS.SOLUTION: A terminal according to an aspect of the present disclosure has: a receiving section that receives settings of one or more sounding reference signal (SRS) resource sets having antenna switching applications and using a plurality of SRS ports; and a control section that, on the basis of the settings, applies at least one of first association from at least one of a plurality of layers, a plurality of code words, a plurality of SRS port groups, and a plurality of demodulation reference signal (DMRS) ports for a physical downlink shared channel to a plurality of channel state information (CSI)-reference signal (RS) ports, and second association from the one or more SRS resource sets to a plurality of SRS port numbers.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a terminal, a wireless communication method, and a base station in a next-generation mobile communication system. [Background technology]

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) has been specified with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) has been specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later) are also being considered. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 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 Summary of the Invention [Problem to be solved by the invention]

[0005] In future wireless communication systems, the use of sounding reference signals (SRS) will be diverse. For example, NR SRS will be 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 to acquire DL CSI has not been fully investigated. If the investigation is insufficient, it may result in degradation of communication quality / throughput.

[0007] Therefore, one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately utilize SRS. [Means for solving the problem]

[0008] A terminal according to one embodiment of the present disclosure includes a receiver that receives configuration of one or more sounding reference signal (SRS) resource sets for use in antenna switching, the SRS resource sets using multiple SRS ports; and a controller that applies, based on the configuration, at least one of a first association from at least one of multiple layers, multiple codewords, multiple SRS port groups, and multiple demodulation 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. [Effects of the Invention]

[0009] According to one aspect of the present disclosure, SRS can be appropriately utilized. [Brief explanation of the drawings]

[0010] [Figure 1]Figure 1 shows an example of two port groups for two receivers in different panels of a foldable mobile phone. [Figure 2] FIG. 2 shows an example of SRS port groups for ranks 5 and 6. [Figure 3] FIG. 3 shows an example of port grouping according to option 2 of embodiment A1. [Figure 4] 4A-4C show an example of a port grouping scheme according to embodiment B1. [Figure 5] FIG. 5 illustrates an example of association between SRS port groups and CSI-RS ports according to Example 1 of Option 2-1 of embodiment C1. [Figure 6] FIG. 6 illustrates another example of association between SRS port groups and CSI-RS ports according to Example 1 of Option 2-1 of embodiment C1. [Figure 7] FIG. 7 illustrates an example of association between SRS resource sets and SRS ports according to option 1 of embodiment C2. [Figure 8] FIG. 8 illustrates an example of association between SRS resource sets and SRS ports according to option 2 of embodiment C2. [Figure 9] FIG. 9 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 10] FIG. 10 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 11] FIG. 11 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 12] FIG. 12 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. [Figure 13] FIG. 13 is a diagram illustrating an example of a vehicle according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] (CSI report or reporting) In Rel.15 NR, a terminal (also referred to as a user terminal, User Equipment (UE), etc.) generates (also referred to as determining, calculating, estimating, measuring, etc.) channel state information (CSI) based on a reference signal (RS) (or a resource for the RS), and transmits (also referred to as reporting, feeding back, 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., a Physical Uplink Control Channel (PUCCH)) or an uplink shared channel (e.g., a Physical Uplink Shared Channel (PUSCH)).

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

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

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

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

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

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

[0018] Furthermore, the reporting amount information may specify a combination of at least one of the above CSI parameters (for example, CRI, RI, PMI, CQI, LI, L1-RSRP, etc.).

[0019] The resource information may also be IDs of resources for RSs, which may include, for example, non-zero power CSI-RS resources or SSBs and CSI-IM resources (e.g., zero power CSI-RS resources).

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

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

[0022] The frequency domain information may indicate whether wideband or subband PMI is to be reported (for example, the frequency domain information may include an RRC IE "pmi-FormatIndicator" used to determine whether wideband PMI reporting or subband PMI reporting is to be performed). The UE may determine the frequency granularity of the CSI report (i.e., whether wideband PMI reporting or subband PMI reporting is to be performed) based on at least one of the above-mentioned reporting amount information and frequency domain information.

[0023] When wideband PMI reporting is configured, one wideband PMI may be reported for the entire CSI reporting band, whereas when subband PMI reporting is configured, a single wideband indication i1 may be reported for the entire CSI reporting band, and one subband indication i2 (e.g., one subband indication for each subband) may be reported for each of one or more subbands within the entire CSI reporting band.

[0024] The UE performs channel estimation using the received RS to estimate a channel matrix H. The UE feeds back a performance management index (PMI) determined based on the estimated channel matrix.

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

[0026] In the space domain, a CSI report may include one or more types of CSI. 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. The single beam may be rephrased as a single layer, and the multi-beam may be rephrased as multiple beams. Furthermore, Type 1 CSI may not assume multi-user multiple input multiple output (MU-MIMO), while Type 2 CSI may assume multi-user MIMO.

[0027] The codebook 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, Type-1 multi-panel codebook) may be defined for each.

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

[0029] The uplink control information (UCI) type may include at least one of a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), a scheduling request (SR), and CSI. The UCI may be carried by the PUCCH or the PUSCH.

[0030] In Rel.15 NR, UCI can contain one CSI part for wideband PMI feedback. CSI report #n contains PMI wideband information if reported.

[0031] In Rel.15 NR, UCI can include two CSI parts for subband PMI feedback. CSI Part 1 includes wideband PMI information. CSI Part 2 includes one wideband PMI and several subband PMIs. CSI Part 1 and CSI Part 2 are coded separately.

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

[0033] For both FR1 and FR2, evaluation and provision of CSI reporting for DL ​​multi-TRP and / or multi-panel transmissions is being considered to enable more dynamic channel / interference hypotheses for NCJT.

[0034] In the present 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 interchangeable. In the present 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 interchangeable.

[0035] (Codebook settings) The UE is configured with parameters (codebook configuration (CodebookConfig)) related to the codebook (CB) by higher layer signaling (RRC signaling). The codebook configuration is included in the CSI reporting configuration (CSI-ReportConfig) of the higher layer (RRC) parameters.

[0036] In the codebook setting, at least one codebook is selected from a plurality of codebooks including type 1 single panel (typeI-SinglePanel), type 1 multi-panel (typeI-MultiPanel), type 2 (typeII), and type 2 port selection (typeII-PortSelection).

[0037] The codebook parameters include the codebook subset restriction (CBSR) parameter ("...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. One bit in the CBSR bitmap corresponds to one codebook index / antenna port.

[0038] (CSI reporting settings) The existing CSI reporting configuration (CSI-ReportConfig) includes a codebook configuration (CodebookConfig), a channel measurement resource (CMR), an interference measurement resource (IMR), etc. The IMR may be at least one of a zero power-interference measurement resource (ZP-IMR) and a non-zero power-interference measurement resource (NZP-IMR).

[0039] In the present disclosure, CMR, NZP CSI-RS resources, and resourcesForChannelMeasurement may be interchangeable. In the present disclosure, ZP-IMR, CSI-IM resources, and csi-IM-ResourcesForInterference may be interchangeable. In the present disclosure, NZP-IMR, NZP CSI-RS resources for interference measurement, and nzp-CSI-RS-ResourcesForInterference may be interchangeable.

[0040] (CSI-RS port) In Rel. 15, for example, 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 time and frequency tracking. 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 transmission. The frequency density of CSI-RS is configurable to adjust overhead and CSI estimation accuracy.

[0041] The specification defines a table showing the location of CSI-RS within a slot. Each row in this table indicates the row number, the number of ports, the frequency domain density, the CDM type, the time and frequency (time / frequency) location (the location of the component resource (k bar, l bar)), the 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 time and frequency resource (component resource) of the CSI-RS corresponding to one port. The k bar is represented by 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] CDM groups include no CDM (no CDM, N / A), FD-CDM2, CDM4, and CDM8. FD-CDM2 multiplexes two-port CSI-RSs at the same time and frequency by multiplying a frequency domain (FD)-orthogonal cover code (OCC) of length 2 in each RE (FD2). CDM4 multiplexes four-port CSI-RSs at the same time and frequency by multiplying a length-2 FD-OCC by a length-2 time domain (TD)-OCC in each RE symbol (FD2TD2). CDM8 multiplexes eight-port CSI-RSs at the same time and frequency by multiplying a length-2 FD-OCC by a length-4 TD-OCC in each RE symbol (FD2TD4).

[0043] (Rel.19 MIMO Considerations) Because the maximum number of CSI-RS ports, 32, is greater than the maximum number of layers, 8, the UE can measure more channel conditions, improving measurement accuracy.

[0044] From Rel. 19 onwards, massive MIMO using more than 32 ports is being considered.

[0045] Targeting FR1, a CSI that supports up to 128 CSI-RS ports is being considered. Specifically, the following items are being considered: ◆Item 2a: Based on an extension of the existing codebook, an improvement to the Type 1 codebook that supports up to a total of 128 CSI-RS ports across all resources, assuming existing CSI-RS resources (with up to 32 CSI-RS ports per resource). ◆Item 2b: Improvement of the Type 2 codebook to support up to a total of 128 CSI-RS ports across all resources, assuming existing CSI-RS resources (with up to 32 CSI-RS ports per resource), based on an extension of the existing codebook without changing any codebook parameters other than the introduction of an additional value for the codebook parameter for the number of ports. ◆Item 2c: Enhancement of CRI-based CSI reporting (reporting of CQI / PMI / RI calculated per CRI for one or more CRIs) for hybrid beamforming supporting up to 32 CSI-RS ports per resource and up to 128 CSI-RS ports in total across all resources without new codebook design. ◆Item 2d: For a 6 / 8Rx low complexity receiver supporting more than four layers, SRS port grouping and association of SRS port grouping to two codewords using existing codebooks are considered. The 6 / 8Rx low complexity receiver may use six or eight Rx antennas. No extensions to codeword-to-layer mapping, DL resource allocation, CSI feedback, or DCI format may be required.

[0046] (Transmitting on more than 4 antenna ports) Rel.15 / 16 NR supports uplink (UL) multi-input multi-output (MIMO) transmission with up to four layers. To achieve higher spectral efficiency for future wireless communication systems, support for UL transmission with more than four layers is being considered. For example, for Rel.18 NR, maximum 6-rank transmission using six antenna ports and maximum 6- or 8-rank transmission using eight antenna ports are being considered.

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

[0048] In the antenna layout, 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 becomes a cross-polarized antenna.

[0049] An antenna group may be referred to as a coherent group. A coherent group may include 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 / SRS resource set / RS resource set / spatial relation information / 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 for codebook or non-codebook. Also, each coherent group may correspond to a different received TRP. Also, the coherent group may be called a coherent antenna group, a port group, an antenna set, etc.

[0051] The UE may report supported antenna groups, antenna configuration information, and the number of coherent antennas as UE capability information. The UE may also be configured with coherent groups (e.g., the number of coherent groups and the number of ports included in each coherent group) via higher layer signaling.

[0052] The number of panels on which the antennas are arranged, the orientation of the panels, the coherency of each panel / antenna (fully coherent, partially coherent, non-coherent, etc.), the antenna arrangement in a particular 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 spacings between the centers of adjacent antenna groups, respectively.

[0053] Furthermore, while Rel.15 / 16 NR supported the transmission of one codeword (CW) in one PUSCH, Rel.18 NR is considering allowing UEs to transmit more than one CW in one PUSCH. 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] In Rel. 17 NR and earlier, transmission of two TBs (e.g., TB#1 and TB#2) is supported in DL transmission (e.g., PDSCH transmission). When two TBs (e.g., TB#2) are supported, a predetermined field for TB#1 and a predetermined field for TB#2 may be included in the DCI (e.g., DCI format 1_1) used for scheduling the PDSCH. The predetermined field may be, for example, at least one of a modulation and coding scheme, a new data indicator, and a redundancy version.

[0055] The support (or enablement) of dual CWs in PUSCH transmission may be notified to the UE by a predetermined higher layer parameter. The predetermined higher layer parameter may be a higher layer parameter related to the maximum number of CWs scheduled by DCI (e.g., maxNrofCodeWordsScheduledByDCI). The predetermined higher layer parameter (e.g., maxNrofCodeWordsScheduledByDCI) may be included in 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), this 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 PDSCH, this may mean that a field for TB#2 is present (or that two codeword transmission is enabled).

[0057] If a predetermined higher layer parameter (e.g., maxNrOfCodeWordsScheduledByDCI) indicates that two codeword transmission is enabled, one of the two transport blocks may be disabled by the DCI format if a predetermined condition is met. For example, the predetermined condition may be a MCS index (e.g., I MCS ) and the RV index are respectively set to predetermined values ​​(for example, I MCS = 26 and RV = 1).

[0058] In this way, a predetermined upper layer parameter is set to a predetermined value (e.g., maxNrofCodeWordsScheduledByDCI=2), and I MCS If there is a TB with RV=26 and RV=1, the corresponding TB may be disabled to realize dynamic indication (or switching) between the case where there are more than four layers and the case where there are less than four layers for the PDSCH.

[0059] In the present disclosure, the first TB, TB1, of the two TBs may be interchangeable. In the present disclosure, the second TB, TB2, of the two TBs may be interchangeable.

[0060] N SRSIt is being considered that a method based on existing specifications will be supported for NCB-based 8Tx PUSCH transmission using >4, where N SRS is the number of single-port SRS resources configured in the SRS resource set. SRS =8 and L max Extend the existing SRI indication table to include L = 8, where L max is the maximum number of MIMO layers. In the SRI indication for the NCB-based PUSCH, a selection may be made between a bitmap indication and a method based on existing specifications.

[0061] To configure PUSCH transmission by an 8Tx UE, it is considered that the maximum number of MIMO layers will be RRC configured by extending the range of maxRank and maxMIMO-Layers up to 8. The maximum rank will be configured by RRC signaling.

[0062] To support dual CW PUSCH transmission for ranks greater than 4 by an 8Tx UE, it is considered that a second MCS field (5 bits) be indicated for the second CW for MCS indication. To support dual CW PUSCH transmission for ranks greater than 4 by an 8Tx UE, it is considered that a second set of new data indicator (NDI, 1 bit) and redundancy version (RV, 2 bits) fields be indicated. That is, additional MCS / NDI / RV for the second CW are supported.

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

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

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

[0066] A UE may be configured with one or more SRS resource sets. One SRS resource set may be associated with a predetermined number of SRS resources. The UE may share higher layer parameters for the SRS resources included in one SRS resource set. Note that the term "resource set" in the present disclosure may be interpreted as a set, a resource group, a group, or the like.

[0067] Information about the SRS resource or resource set may be configured in the UE using higher layer signaling, physical layer signaling, or a combination thereof.

[0068] The SRS configuration information element (eg, the RRC information element "SRS-Config") may include an SRS resource set configuration information element, an SRS resource configuration information element, and so on.

[0069] The SRS resource set configuration [information element] (e.g., the RRC parameter "SRS-ResourceSet") may include an SRS resource set ID (SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, an SRS resource type (resourceType), and information on SRS usage.

[0070] Here, the SRS resource type may indicate the time domain behavior of SRS resource configuration, and may indicate any of Periodic SRS (P-SRS), Semi-Persistent SRS (SP-SRS), and Aperiodic SRS (A / AP-SRS). The UE may transmit P-SRS and SP-SRS periodically (or periodically after activation). The UE may transmit A-SRS based on an SRS request in the DCI.

[0071] Furthermore, the use of the SRS ("usage" of the RRC parameter, "SRS-SetUse" of the L1 (Layer-1) parameter) may be, for example, beam management, codebook (CB), non-codebook (NCB), antenna switching, etc. For example, an SRS for codebook or non-codebook use may be used to determine a precoder for codebook-based or non-codebook-based uplink shared channel (Physical Uplink Shared Channel (PUSCH)) transmission based on the SRI.

[0072] The beam management SRS may be assumed to allow only one SRS resource for each SRS resource set to be transmitted at a given time instant. However, if multiple SRS resources with the same time domain behavior in the same Bandwidth Part (BWP) belong to different SRS resource sets, these SRS resources may be transmitted simultaneously.

[0073] The SRS resource configuration [information element] (e.g., the RRC parameter "SRS-Resource") may include an SRS resource ID (SRS-ResourceId), an SRS port number, an SRS port number, a transmission comb number, an SRS resource mapping (e.g., time and / or frequency resource position, resource offset, resource period, repetition number, SRS symbol number, SRS bandwidth, etc.), hopping-related information, an SRS resource type, a sequence ID, spatial relationship information, etc.

[0074] The value of the transmission comb number (transmissionComb) is {2,4}. The number of SRS ports (nrofSRS-Ports) N ap SRS The value of is {1,2,4}. Antenna port number p i The value of is {1000, 1001, ...}. The number of consecutive OFDM symbols in the SRS (nrofSymbols) N symb SRS The value of is {1,2,4}. The offset in symbols, l, counting backward in the time domain from the end of the slot to the start position in the time domain (startPosition). offset is {0,1,...5} and the starting position is l0=N symb slot -1-l offset is given by

[0075] The setting of the number of combs to be transmitted may include a comb offset and a cyclic shift (CS index, CS number).

[0076] comb offset (subcarrier offset) = {0,1,...K TC SRSs from UEs with at least one different SRS and CS may be multiplexed using the same number of transmission combs, the same RBs, and the same symbols.

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

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

[0079] where k - denotes the variable k with an overline, which may also be called k-bar. - 0 p_i is comb offset K - TC It may be based on K TC is the number of combs sent. M SC,b SRS is the SRS bandwidth m SRS,b n is the number of subcarriers used for SRS transmission within [RB]. b is a constant.

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

[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 SRS application. SRS antenna switching may be used, for example, when downlink CSI acquisition is performed using uplink SRS in a Time Division Duplex (TDD) band.

[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 with that precoder applied (beamformed).

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

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

[0085] In the present disclosure, txry and xTyR may be read interchangeably with respect to (x, y).

[0086] When x and y in "txty" have the same value, they may be written as xT=xR (for example, 4T=4R).

[0087] For example, a 2T4R (two transmit ports, four receive ports) UE may be configured with an SRS resource set for DL ​​CSI acquisition that includes two SRS resources with two ports each and whose purpose is antenna switching.

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

[0089] In the present disclosure, the terms SRS Tx port switching pattern and SRS antenna switching setting may be read interchangeably.

[0090] The value of supportedSRS-TxPortSwitch may indicate '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 not supported.

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

[0092] supportedSRS-TxPortSwitch MAY report at least one of the following values: 't1r2' 't1r4' 't2r4' 't2r2' 't4r4' '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. The UL group is defined as band entries with ULs that affect each other's ULs. That is, SRS Tx port switching on any cell in the group affects the ULs on all cells in the group. If the UL group contains only one band entry, this parameter is not present. For 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 in that band entry. All DL and UL bands that switch together shall indicate the same entry number. The entry number is the band entry number within the band combination. The UE is restricted to not include fallback band combinations for the purpose of indicating different SRS switching capabilities. The bands that include UL include bands that support SRS-SwitchingTimeNR and are associated with FeatureSetUplinkId set to 0.

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

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

[0096] [Setting 1] For 1T2R, up to two SRS resource sets with different values ​​for the resource type (higher layer parameter resourceType) within the SRS resource set, each set having two SRS resources transmitted in different symbols, each SRS resource in a given set consisting of a single SRS port, and the SRS port of the second resource in the set being associated with a different UE antenna port than the SRS port of the first resource in the same set.

[0097] [Setting 2] For 2T4R, up to two SRS resource sets with different values ​​for the resource type (higher layer parameter resourceType) within the SRS resource set, each SRS resource set having two SRS resources transmitted in different symbols, each SRS resource in a given set consisting of two SRS ports, where 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] [Setting 3] For 1T4R, zero or one SRS resource set with four SRS resources transmitted in different symbols, with the resource type (higher layer parameter resourceType) within the SRS resource set set to periodic or semi-persistent. 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] [Setting 4] For 1T4R, zero or two SRS resource sets each have a total of four SRS resources transmitted in different symbols of two different slots, with the resource type within the SRS resource set (higher layer parameter resourceType) set to aperiodic. The SRS ports of each SRS resource within the two given sets are associated with different UE antenna ports. Each of the two sets is configured with two SRS resources, or one set is configured with one SRS resource and the other set is configured with three SRS resources. The UE expects both sets to be configured with the same values ​​of the power control parameters within the SRS resource sets (higher layer parameters alpha, p0, pathlossReferenceRS, and srs-PowerControlAdjustmentStates). The UE assumes that the values ​​of the parameters (the upper layer parameter aperiodicSRS-ResourceTrigger, a parameter indicating the codepoint of the SRS request field in the DCI) in each SRS resource set are the same, and that the values ​​of the upper layer parameter slotOffset in each SRS resource set are different.

[0100] [Setting 5] Up to two SRS resource sets, each with 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 is configured for antenna switching usage within the SRS resource set, the UE may configure the SRS antenna switching configuration depending on the reported UE capability information (supportedSRS-TxPortSwitch, supportedSRS-TxPortSwitch-v1610).

[0102] If a set of SRS resources is transmitted in the same slot as Y symbols, the UE is configured with a guard period of Y symbols during which the UE does not transmit any other symbols. The guard period is between the SRS resources of the set.

[0103] If the indicated UE capability is 1T4R / 2T4R, the UE assumes that the same SRS port number of 1 or 2 is configured for all SRS resources in the SRS resource set.

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

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

[0106] In the present disclosure, downgrade configuration and SRS Tx port switching pattern using antennas / ports that are less than the total number of antennas / total number of antennas / total number of Rx antennas / maximum number of Rx ports may be read interchangeably.

[0107] Rel.17 UE capability signaling (srs-AntennaSwitchingBeyond4RX-r17) indicates whether the UE supports SRS antenna switching for more than four Rx. The capability signaling has several parameters: - supportedSRS-TxPortSwitchBeyond4Rx-r17. It 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}. For any indication, x is less than or equal to the value associated with the largest y. - entryNumberAffectBeyond4Rx-r17, which indicates the entry number of the first listed band with UL in the band combination that affects this DL. - entryNumberSwitchBeyond4Rx-r17, which indicates the entry number of the first listed band with this UL in the band combination that switches with this UL.

[0108] A UE indicating support for this capability indicates support for srs-TxSwitch.

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

[0110] In the present disclosure, the terms SRS transmission port switching pattern and antenna switching SRS setting may be read interchangeably.

[0111] (Physical layer procedures for data / UE procedures for CSI reporting / CSI framework / Reporting configuration / Reporting amount configuration) If a UE is configured with a CSI-ReportConfig with the higher layer parameter reportQuantity set to 'cri-RI-CQI', the UE shall follow several steps:

[0112] ◆ If the UE is configured with the upper layer parameter non-PMI-PortIndication in the CSI-ReportConfig, the r ports are indicated according to the layer order for rank r, and each CSI resource in the CSI resource setting is linked to the CSI-ReportConfig based on the order of the NZP-CSI-RS-ResourceId associated with it in the CSI resource setting linked for channel measurement given by the upper layer parameter resourcesForChannelMeasurement. The configured upper layer parameter non-PMI-PortIndication is a sequence of port indices p0 (1) ,p0 (2) ,p1 (2) ,p0 (3) ,p1 (3) ,p2 (3) ,...,p0(R) ,p1 (R) ,...,p R-1 (R) where p0 (v) ,...,p v-1 (v) is the CSI-RS port index associated with rank v, R∈{1,2,...,P}, where P∈{1,2,4,8} is the number of ports in the CSI-RS resource. The UE reports only the RI corresponding to the set field of PortIndexFor8Ranks. When a CSI-ReportConfig is configured containing a list of subsets with portSubsetIndicator set in each subset, and the upper layer parameter non-PMI-PortIndication is provided separately for the subsets, P∈{1,2,4,8} corresponds to the number of bits with value 1 in the bitmap portSubsetIndicator for that subset, and the CSI-RS port index is derived by mapping the antenna ports corresponding to all bits with value 1 in portSubsetIndicator as consecutive antenna ports according to ascending bit position in portSubsetIndicator, starting from CSI-RS port index 0.

[0113] ◆ If the UE is not configured with the higher layer parameter non-PMI-PortIndication, the UE shall set the CSI-RS port index p0 for each CSI-RS resource in the CSI Resource Setting linked to the CSI-ReportConfig. (v) ,...,p v-1 (v)= {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 subsets with portSubsetIndicator set within each subset, and the higher layer parameter non-PMI-PortIndication is not provided, then P∈{1,2,4,8} corresponds to the number of bits with value 1 in the bitmap portSubsetIndicator for that subset, and the CSI-RS port index is derived by mapping the antenna ports corresponding to all bits with value 1 in portSubsetIndicator as consecutive antenna ports according to increasing bit position in portSubsetIndicator, starting with CSI-RS port index 0.

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

[0115] (analysis) It is considered that there is no extension regarding CW to layer mapping for the RRC configuration / definition of SRS port / resource grouping / association and the RRC configuration / definition of CW (DMRS port) grouping / association.

[0116] It is contemplated that multiple port grouping schemes may be reported by UE capability signaling. For example, a specific UE implementation supporting grouping of SRS ports (0,2,4,6) and grouping of SRS ports (1,3,5,7) may look like this:

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

[0118] In the 2T8R shown in Figure 1, the SRS ports across the four resources are numbered as (0,1), (2,3), (4,5), and (6,7). SRS ports 0, 2, 4, 6 and SRS ports 1, 3, 5, 7 use different RF chains [because multiple ports within an SRS resource need to be transmitted simultaneously within one symbol]. To avoid RF crossing the hinge, SRS ports (0, 2, 4, 6) and SRS ports (1, 3, 5, 7) are in different panels of the foldable phone. That is, the two port groups for the two receivers are SRS ports (0, 2, 4, 6) and SRS ports (1, 3, 5, 7).

[0119] With the new SRS port grouping for low complexity multi-panel UE, the association between CSI-RS and layer / CW needs to be reconsidered.

[0120] If 'cri-RI-CQI' is configured, and non-PMI-PortIndication is configured, the association between CSI-RS and layer / CW is configured by RRC based on the gNB implementation, so there is no problem.

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

[0122] In this way, the association between the CSI-RS and the layer / CW has not been sufficiently considered, which may lead to a decrease in communication quality / throughput.

[0123] Therefore, the present inventors have studied how to use SRS and have come up with the following embodiments.

[0124] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0125] (Various reading changes) In this disclosure, words enclosed in "()" in a sentence may indicate an explanation of the immediately preceding wording (for example, an explanation of spelling), a paraphrase, a specific example, a supplementary explanation, etc. Also, in this disclosure, words enclosed in "[ ]" in a sentence may be interpreted including the meaning of the entire sentence, or may be interpreted excluding the meaning of the entire sentence (ignoring the meaning of the entire sentence). Note that "()" and "[ ]" may also be used for purposes / meanings other than those mentioned above.

[0126] In the present disclosure, "A / B" and "at least one of A and B" may be interpreted interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0127] In the present disclosure, terms such as notify, activate, deactivate, indicate (or indicate), select, configure, update, and determine may be interchangeable. In the present disclosure, terms such as support, control, controllable, operate, and operate may be interchangeable.

[0128] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, fields, information elements (IEs), settings, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

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

[0130] In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. Broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0131] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0132] In the present disclosure, ceil(x), ceiling function, and ceiling function may be interchangeable. In the present disclosure, floor(x), floor function, and floor function may be interchangeable. In the present disclosure, sqrt(x), square root of x, and root x may be interchangeable. In the present disclosure, x mod y, mod(x,y), mod function, and modulo operation may be interchangeable. In the present disclosure, Σ i=M M+N-1 f(i),Σ i=M M+N-1 f i , f(i) or f for i=M, M+1,..., M+N-1 i summation of f(M)+f(M+1)+...+f(M+N-1), f M +f M+1 +...+f M+N-1 , may be read interchangeably. C(n,k) is the number of combinations of k values ​​selected from n values ​​(combinatorial coefficient), binomial coefficients,n C k , C n k , may be read as interchangeable. In the present disclosure, x / / y and floor(x / y) may be read as interchangeable.

[0133] In this disclosure, A b , A_b, Ab, and A with b added to the bottom right may be read interchangeably. c , A^c, and the notation of A with c added to the upper right may be read interchangeably. b c , A_b^c, and the notation in which b is added to the bottom right of A and c is added to the top right of A may be read interchangeably. ~ may be expressed by adding 〜 to the x, or may be referred to as x tilde. - may be represented by placing a - on top of the x, or may be referred to as an x-bar. ^ may be represented by placing a ^ above the x, or may be called an x-hat.

[0134] In the present disclosure, FR may be, for example, at least one of FR1, FR2, FR2-1, FR2-2, FR3, sub-terahertz, and terahertz. In the present disclosure, the frequency range corresponding to FR1 may be 410-7125 MHz. In the present disclosure, FR2 may include FR2-1 and FR2-2, and 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] The following abbreviations may be used in this disclosure: ◆FDM: frequency division multiplexing ◆TDM: time division multiplexing ◆CDM:spatial division multiplexing

[0136] In the present disclosure, the terms indicate, report, and select may be read interchangeably.

[0137] In this disclosure, CW and TB may be interchangeable. If both TB1 and TB2 are valid, TB1 and TB2 may be mapped to CW0 and 1, respectively. If only one TB is valid, that TB may be mapped to the first CW.

[0138] In the present disclosure, port #i, port index, port number, and port ID may be read interchangeably.

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

[0140] In the present disclosure, SRS port index i=0, 1, . . . and SRS port index p=1000+i=1000, 1001, . . . may be read interchangeably.

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

[0142] In the present 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 interchangeable. In the present disclosure, 8Tx, transmission using a rank of 8 (8 layers), and transmission using 8 antennas (antenna ports) may be interchangeable. In the present disclosure, 6Tx, transmission using a rank of 6 (6 layers), and transmission using 6 antennas (antenna ports) may be interchangeable. In the present disclosure, Tx, transmission, PUSCH, and SRS may be interchangeable.

[0143] In the present disclosure, nRx, n Rx, reception using n Rx antennas (ports), and reception using rank n (n layers) may be read interchangeably.

[0144] In the present disclosure, [supporting more than four layers] [6 / 8Rx] low complexity receiver, low complexity multi-panel UE, low complexity reception, and SRS port group may be read interchangeably.

[0145] In the present disclosure, the terms layer, CW, SRS port group, and PDSCH DMRS port may be interchangeable.

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

[0147] In the SRS configuration for antenna switching, when xTyR using y=6 or 8 is configured, 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: Through explicit RRC configuration for grouping of y ports (grouping of multiple SRS resources corresponding to y ports), y SRS ports are divided into two port groups.

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

[0150] The y SRS ports may be obtained from one of several 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 several options: ◆Option 1: One SRS resource set. ◆Option 2: A set of more than one SRS resource, for example 2, 4, 6, or 8 SRS resources.

[0152] ◆Supplementary Note 1: Different SRS port groups may correspond to different UE antenna groups / panels, respectively.

[0153] Supplementary Note 2: Embodiment A1 may be applied to the case where only CSI-RS resources using more than 32 ports are configured, or may be applied to any case of CSI-RS resource configuration. Any case may include the case 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 set is greater than four.

[0155] Variation: The port grouping of embodiment A1 may also be supported for the case where y is smaller than 6 (y is equal to or smaller than 4, for example, y=4).

[0156] In the present disclosure, the terms port group, SRS port group, group, set, and pool may be interchangeable. In the present disclosure, the terms SRS port grouping, port grouping, and grouping may be interchangeable.

[0157] According to embodiment A1, a plurality of SRS ports can be appropriately grouped.

[0158] <Analysis> Although embodiment A1 / embodiment A2 describe grouping / association set by RRC or defined by specifications, multiple groupings / associations in multiple cases may be supported / adopted depending on UE implementation or UE mobility.

[0159] <Embodiment B1> <<UE Capability of Port Grouping Scheme>> A UE may report one or more schemes ([SRS] port grouping schemes) in UE capability report signaling. A port grouping scheme may indicate 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 by UE capability report signaling: ◆ Scheme 1 (first grouping): Port grouping into two groups: port [ID / number] {0,1,2,3}, {4,5,6,7} (Fig. 4A). ◆ Scheme 2 (second grouping): Port grouping into two groups: port [ID / number] {0,2,4,6}, {1,3,5,7} (Fig. 4B). ◆ Scheme 3 (third grouping): Port grouping into two groups of ports [ID / number] {0,1,4,5} and {2,3,6,7} (Fig. 4C).

[0160] ◆Note 1: Port may refer to the UE antenna port at Rx.

[0161] Note 2: One of multiple schemes (e.g., 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 scheme is declared in the capability report for a port grouping of a UE, the NW may recognize that the UE supports the basic scheme.

[0162] <<Configuring a port grouping scheme>> The NW may configure / instruct / update one port grouping scheme for multiple ports / resources of SRS to the UE [at once] via RRC IE / MAC CE / DCI depending on / according to the UE capability. For example, instead of configuring an arbitrary port grouping scheme, the RRC IE may configure one of multiple port grouping schemes for SRS port groupings that are defined / configured (configuration in RRC IE) / reported (UE capability) instead of configuring an arbitrary port grouping scheme.

[0163] ◆Note 3: For N configured ports from M SRS resources for antenna switching, the first port from the first SRS resource may be regarded as the first port for grouping, the second port from the first SRS resource may be regarded as the second port, ..., the last port from the Mth SRS resource may be regarded as the Nth port. In other words, the N SRS port IDs may be indexed in ascending order of 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>> The details and notes of the settings / instructions for SRS port grouping and the association of SRS port grouping and CW (DMRS port) in embodiment A1 may be applied to embodiment B1.

[0165] According to embodiment B1, the UE can perform appropriate SRS port grouping based on the SRS port grouping capability.

[0166] <Embodiment C1> In at least one of the cases where SRS port grouping capability is reported by the UE and where 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 / variations y below.

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

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

[0169] <<<Option 2-1>>> For multiple ranks v, the association (first association [rule], mapping) between CSI-RS ports and layers (or between CSI-RS ports and CWs, 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 examples x below.

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

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

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

[0173] ◆ Example 1: There is one association, which may apply to all rank cases (e.g. ranks 5 to 8).

[0174] ◆ Example 2: There may be separate 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 RRC configured by the NW, and one or more associations may be reported by UE capability signaling.

[0176] <<Variation 2>> UE capability signaling / reporting for options 1 / 2 may be introduced.

[0177] According to this embodiment, in non-PMI reporting, the UE can properly 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, a grouping of y ports (0, 1,..., y-1) of an SRS may be defined in the specification or configured by RRC, and a mapping rule for when the y ports come from at least one of more than one SRS resource and more than one SRS resource set may be defined in the specification.

[0179] At least one of several options x below 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, ... 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 defined rules are applied to y = 8 ports and two 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. When 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, etc. within that SRS resource set.

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

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

[0185] ◆Example: As shown in Figure 8, when defined rules are applied to y = 8 ports, two SRS resource sets, and two SRS resources for each SRS resource set, the two SRS resources in the first SRS resource set correspond to port indices 0 - 1 and 4 - 5 respectively, and the two 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 above-described embodiments, notification of any information to the UE [from a Network (NW) (e.g., a Base Station (BS))] (in other words, reception of any information from the BS by the UE) may be performed using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE, RRC message, LTE positioning protocol (LPP) message), specific signals / channels (e.g., DCI, PDCCH, PDSCH, reference signal), or a combination thereof.

[0187] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new Logical Channel ID (LCID) in the MAC subheader that is not defined in existing standards. The MAC CE may be an extension of an existing MAC CE. For example, the MAC CE may be an existing MAC CE with a new octet introduced.

[0188] When the notification is performed by DCI, the notification may be performed by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc. 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 embodiments may be periodic, semi-persistent (triggered by the UE or the gNB), or aperiodic (triggered by the UE or the gNB).

[0190] In the above embodiments, the UE may receive from the NW at least one piece of information among the following several QCL rules. ◆QCL type A ◆QCL type B ◆QCL type C ◆QCL type D

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

[0192] In the above embodiments, the information from the NW may be set / instructed by the following methods. ◆Common to multiple UEs or UE-specific ◆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 the UE>> In the above embodiments, the notification of any information from the UE to the [NW] (in other words, the transmission / reporting of any information from the UE to the BS) may be performed using physical layer signaling (e.g., UCI), upper layer signaling (e.g., RRC signaling, MAC CE, RRC message, LPP message), specific signals / channels (e.g., UCI, PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.

[0194] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new LCID in the MAC subheader that is not defined in existing standards. The MAC CE may be an extension of an existing MAC CE. For example, the MAC CE may be an extension of an existing MAC CE by introducing a new octet.

[0195] If the notification is performed by UCI, the notification may be transmitted using PUCCH or PUSCH.

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

[0197] <<Application of each embodiment>> In a UE / BS, the specific process / operation / control / assumption / information(s) of at least one of the above-described embodiments may be applied (used) when one or more of the following conditions are met: ◆ Upper layer parameters indicating the above specific processing / operation / control / assumment / information are set. ◆The above specific processing / action / control / assuming / information is determined based on the relevant upper layer parameters, ◆The above specific processing / action / control / assuming / information is instructed / specified / activated / triggered by MAC CE / DCI / UCI / resource / channel / RS, Reporting or supporting specific UE capabilities that indicate (or relate to) the specific processes / operations / controls / assumptions / information mentioned above; ◆The application of the above specific processing / action / control / assumption / information is determined based on specific conditions.

[0198] The specific UE capabilities may indicate at least one of the following: ◆Supporting the above specific processing / action / control / assuming / information, ◆ Capabilities of each embodiment. * Capabilities of each option in each embodiment, or capabilities of a combination of multiple options in each embodiment. ◆The capabilities of each option in each embodiment, or the capabilities of a combination of multiple options in each embodiment.

[0199] Furthermore, the above-mentioned specific UE capability may be a capability that is applied across all frequencies (commonly regardless of frequency), or may be a capability for each frequency (e.g., one or a combination of a cell, band, band combination, BWP, component carrier, etc.), or may be a capability for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or may be a capability for each subcarrier spacing (SubCarrier Spacing (SCS)), or may be a capability for each Feature Set (FS) or Feature Set Per Component-carrier (FSPC).

[0200] Furthermore, the specific UE capability may be a capability that is applied across all duplexing methods (commonly regardless of the duplexing method), or may be a capability for each duplexing method (for example, Time Division Duplex (TDD) or Frequency Division Duplex (FDD)).

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

[0202] Information on 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 configured 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 the 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 the conditions described / defined in the specification. ◆The information is determined by a combination of several pieces of information above. For example, the information is determined by upper layer parameters / MAC CE / DCI settings / indications, and reported by UE capabilities.

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

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

[0205] (Addendum) The following inventions are added regarding one embodiment of the present disclosure. [Appendix 1] a receiver (e.g., transceiver 220) configured to receive one or more sounding reference signal (SRS) resource set configurations (e.g., SRS configurations) using multiple SRS ports for antenna switching; a control unit (e.g., control unit 210) that applies, based on the configuration, at least one of a first association from at least one of a plurality of layers, a plurality of codewords, a plurality of SRS port groups, and a plurality of physical downlink shared channel demodulation reference signal (DMRS) ports 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. [Appendix 2] The terminal described in Supplementary Note 1, wherein in at least one of a case where SRS port grouping capability is reported by the terminal and a case where the SRS port grouping (or low complexity reception) is configured, if CSI reporting not including a precoding matrix indicator (PMI) is configured, an upper layer parameter of port indication for calculation for non-PMI is configured. [Appendix 3] In at least one of a case where an SRS port grouping capability is reported by the terminal and a case where the SRS port grouping is configured, if a CSI report that does not include a precoding matrix indicator (PMI) is configured and an upper layer parameter of a port indication for calculation for a non-PMI is not configured, the controller applies the first association to the CSI report. [Appendix 4] 4. The terminal according to claim 1, wherein the control unit determines, based on the second association, numbers of the plurality of SRS ports for at least one of the one or more SRS resource sets and a plurality of SRS resources in the one or more SRS resource sets.

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

[0207] 9 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 (which may be simply referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), or the like, which are specified by the Third Generation Partnership Project (3GPP).

[0208] The wireless communication system 1 may also 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)), etc.

[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 in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0211] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The location, number, shape, size, etc. of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, 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 may be formed by multiple antennas / base stations 10. One [virtual] cell (which may be called, for example, a super cell) may be composed of multiple [virtual] cells (which may be called, for example, sub-cells). A super cell may correspond to a cell whose physical range is fixed, and a sub-cell may correspond to a cell whose physical range varies semi-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 a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the 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 (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 a frequency band higher than FR2.

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

[0216] The multiple base stations 10 may be connected by wire (for example, optical fiber conforming to the Common Public Radio Interface (CPRI), an X2 / Xn interface, etc.) or wirelessly (for example, NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0217] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

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

[0219] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0220] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the radio communication system 1. 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-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0221] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

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

[0223] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0224] The PDSCH transmits user data, higher layer control information, System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit Master Information Block (MIB).

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

[0226] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as an UL grant, a UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

[0227] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0228] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," "CORESET setting," etc. in the present disclosure may be read interchangeably.

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

[0230] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[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, 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. may be transmitted as DL-RS.

[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 the SS (PSS, SSS) and the PBCH (and DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as reference signals.

[0233] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0234] (base station) 10 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0235] In this example, the functional blocks of the characteristic parts of the present 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 unit described below may be omitted.

[0236] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

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

[0238] The transceiver 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 transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

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

[0240] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0241] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0242] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0243] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0244] The transceiver 120 (transmission processor 1211) may perform transmission processing 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 on the bit string to be transmitted, and output a baseband signal.

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

[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 .

[0247] The transceiver 120 (reception 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 (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0248] The transceiver 120 (measurement unit 123) may perform measurements on 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 measure received power (e.g., Reference Signal Received Power (RSRP)), received 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 transmit and receive signals (backhaul signaling) between devices included in the core network 30 (e.g., network nodes providing NFs), 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] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the 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 perform RF processing (digital beamforming, digital-to-analog conversion, analog beamforming, etc.) and lower-level functions of the physical layer (precoding, IFFT, FFT, etc.). The DU may perform higher-level functions of the physical layer (coding to resource element mapping, etc.), MAC layer functions, and RLC layer functions. The CU may perform PDCP layer, Service Data Adaptation Protocol (SDAP) layer, and RRC layer functions.

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

[0253] The transceiver 120 may transmit a configuration of one or more sounding reference signal (SRS) resource sets for use in antenna switching, each using multiple SRS ports. The controller 110 may apply, based on the configuration, at least one of a first association of at least one of multiple layers, multiple codewords, multiple SRS port groups, and multiple physical downlink shared channel demodulation reference signal (DMRS) ports to multiple channel state information (CSI)-reference signal (RS) ports and a second association of the one or more SRS resource sets to multiple SRS port numbers.

[0254] (user terminal) 11 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0255] Note that this example mainly shows functional blocks of the characteristic parts of the present embodiment, 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 unit described below may be omitted.

[0256] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[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 transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 220.

[0258] The transceiver 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 transceiver unit 220 may be configured from a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

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

[0260] The transmitting / receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0261] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0262] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0263] The transceiver 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, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0264] The transceiver 220 (transmission processor 2211) may perform transmission processing 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 on the bit string to be transmitted, and output a baseband signal.

[0265] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and when transform precoding is not enabled, the transceiver unit 220 may not perform DFT processing as the transmission processing.

[0266] The transmitting / receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal 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 transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which 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 transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal. The measurement unit 223 may 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 the channel measurement resources. The 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 the interference measurement resources. The interference measurement resources may be at least one of an NZP CSI-RS resource for interference measurement, a CSI-Interference Measurement (IM) resource, etc. Note that CSI-IM may be referred to as CSI-Interference Management (IM) or may be interchangeably read as Zero Power (ZP) CSI-RS. Note that in the present disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc. may be interchangeably read as interchangeable.

[0271] The transmitting section and receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0272] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or multiple devices with software.

[0273] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As mentioned above, the implementation method of each is not particularly limited.

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

[0275] In this disclosure, terms such as apparatus, circuit, device, section, unit, etc. may be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0276] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by 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 a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0278] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0279] The processor 1001 also reads programs (program codes), 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 in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be realized in a similar manner.

[0280] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to an embodiment of the present disclosure.

[0281] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), 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. Storage 1003 may also be referred to as a secondary storage device.

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

[0283] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0284] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between 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), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0286] Note that the devices included in the core network 30 (for example, network nodes that provide NFs) may also be realized by the above-described functional block / hardware configuration.

[0287] (Variation) Note that terms explained in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0288] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed 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 numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

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

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

[0292] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0293] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, 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, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. However, the definition of TTI is not limited to this.

[0295] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0296] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0297] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0298] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0299] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0300] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0301] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

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

[0303] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

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

[0305] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0306] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio 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, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

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

[0308] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

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

[0310] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0311] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0312] With respect to any information (e.g., variables, constants, parameters) described in the present disclosure, even if not specifically stated in the above embodiments, any first device (e.g., UE / base station) may notify any second device (e.g., base station / UE) of information indicating / identifying (or relating to) the value of the any information.

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

[0314] Note that the physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be called an RRC message, such as an RRC connection setup message or an RRC connection reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0315] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., 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 by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0317] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0318] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0319] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0320] In the present 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," "receiving entity," etc. may be used interchangeably.

[0321] In the present disclosure, the term "antenna port" may be interchangeably read as an antenna port for any signal / channel (e.g., a demodulation reference signal (DMRS) port). In the present disclosure, the term "resource" may be interchangeably read as a resource for any signal / channel (e.g., a reference signal resource, an SRS resource, etc.). The resource may include time / frequency / code / space / power resources. The spatial domain transmission filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.

[0322] The group may include, for example, at least one of 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, a panel group, and the like.

[0323] In addition, in the present disclosure, beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, codeword (CW), transport block (TB), RS, etc. may be read as interchangeable terms.

[0324] In addition, in the present disclosure, the terms 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 read interchangeably.

[0325] Furthermore, in this disclosure, terms such as "QCL," "QCL assumptions," "QCL relationships," "QCL type information," "QCL properties," "specific QCL type (e.g., Type A, Type D) properties," and "specific QCL type (e.g., Type A, Type D)" may be interchangeable.

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

[0327] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and spatial relationship information (TCI state) may be interchangeable. "Spatial relationship information (TCI state)" may be interchangeable with "set of spatial relationship information (TCI state)", "one or more pieces of spatial relationship information", etc. The TCI state and TCI may be interchangeable. The spatial relationship information and spatial relationship may be interchangeable.

[0328] In this disclosure, terms such as "base station (BS)," "radio 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," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0329] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0330] In the present disclosure, a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control / operate based on the information.

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

[0332] A mobile station may also be referred to as 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 suitable terminology.

[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. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0334] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0335] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do 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] 13 is a diagram showing an example of a vehicle according to an embodiment. A 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, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM sensor 51, an air 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 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. 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 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (e.g., an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0339] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0340] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various 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 (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0342] The driving assistance system unit 64 is configured with various devices that provide functions for preventing accidents and reducing the driver's driving burden, 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 Units (IMUs), Inertial Navigation Systems (INSs)), Artificial Intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving 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 transmits and receives data (information) via the communication port 63 to and from 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, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are 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 an external device. For example, it transmits and receives various information to and from the external device 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 above-mentioned base station 10 or user terminal 20. Furthermore, the communication module 60 may be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (or may function as at least one of the base station 10 and user terminal 20).

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

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

[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, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0348] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present 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) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as uplink channel and downlink channel may be read as sidelink channel.

[0349] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0350] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0351] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the specific order presented.

[0352] Each aspect / embodiment described in the present disclosure may be a technology other than 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 (x is, for example, an integer or decimal number)), 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 (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems that use 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. It may also be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0353] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0354] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0355] The term "determining," as used in this disclosure, may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0356] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0357] Furthermore, "determination" may be considered to be "determining" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "determining" some action. In the present disclosure, "determination" may be read interchangeably with the above-mentioned actions.

[0358] Furthermore, in this disclosure, "determine / determining" may be interchangeably read as "assume / assuming," "expect / expecting," "consider / considering," etc. Furthermore, in this disclosure, "does not expect to do..." may be interchangeably read as "assumes not to do...."

[0359] In the present disclosure, "expect" may be interchangeably read as "be expected." For example, "expect(s) ..." ("..." may be expressed, for example, as a that clause, a to-infinitive, etc.) may be interchangeably read as "be expected ...," "do ... (if the above "..." is a to-infinitive, a verb with "to")," etc. "does not expect ..." may be interchangeably read as "be not expected ...," "does not ... (if the above "..." is a to-infinitive, a verb with "to")," etc. Furthermore, "An apparatus A is not expected ..." may be interchangeably read 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 "maximum transmit power" in this disclosure may mean the maximum value of 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," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0362] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0363] In the present 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 "coupled" may also be interpreted in the same way as "different."

[0364] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0365] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0366] In the present disclosure, terms such as "less than or equal to," "less than," "greater than," "more than," "equal to," etc. may be interchangeable. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative, as expressions with the prefix "i-th" (i is any integer) (for example, "highest" may be interchangeable as "i-th highest").

[0367] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0368] In the present disclosure, terms 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. Note that A, B, and the like herein may be replaced with appropriate expressions, such as nouns, gerunds, and regular sentences, depending on the context. Note that the time difference between A and B may be nearly zero (immediately after or immediately before). A time offset may be applied to the time at which A occurs. For example, "A" may be interchangeable with "before / after the time offset at which A occurs." The time offset (eg, one or more symbols / slots) may be predefined or may be specified by the UE based on signaled information.

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

[0370] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The description of the present disclosure is for illustrative purposes only and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. a receiver configured to receive one or more configurations of sounding reference signal (SRS) resource sets for use in antenna switching and using multiple SRS ports; and a control unit that applies at least one of a first association from at least one of a plurality of layers, a plurality of codewords, a plurality of SRS port groups, and a plurality of physical downlink shared channel demodulation reference signal (DMRS) ports to a plurality of channel state information (CSI)-reference signal (RS) ports based on the configuration, and a second association from the one or more SRS resource sets to a plurality of SRS port numbers.

2. 2. The terminal according to claim 1, wherein, in at least one of a case where an SRS port grouping capability is reported by the terminal and a case where the SRS port grouping is configured, if a CSI report that does not include a precoding matrix indicator (PMI) is configured, a higher layer parameter of a port indication for calculation for a non-PMI is configured.

3. 2. The terminal according to claim 1, wherein, in at least one of a case where an SRS port grouping capability is reported by the terminal and a case where the SRS port grouping is configured, if a CSI report that does not include a precoding matrix indicator (PMI) is configured and an upper layer parameter of a port indication for calculation for a non-PMI is not configured, the controller applies the first association to the CSI report.

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

5. receiving a configuration of one or more sounding reference signal (SRS) resource sets for use in antenna switching and using multiple SRS ports; and applying at least one of a first association from at least one of a plurality of layers, a plurality of codewords, a plurality of SRS port groups, and a plurality of physical downlink shared channel demodulation reference signal (DMRS) ports to a plurality of channel state information (CSI)-reference signal (RS) ports based on the configuration, and a second association from the one or more SRS resource sets to a plurality of SRS port numbers.

6. a transmitter configured to transmit a configuration of one or more Sounding Reference Signal (SRS) resource sets using multiple SRS ports for antenna switching; and a control unit that applies at least one of a first association from at least one of a plurality of layers, a plurality of codewords, a plurality of SRS port groups, and a plurality of physical downlink shared channel demodulation reference signal (DMRS) ports to a plurality of channel state information (CSI)-reference signal (RS) ports based on the configuration, and a second association from the one or more SRS resource sets to a plurality of SRS port numbers.

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