Terminal, wireless communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure is characterized by comprising: a reception unit that receives an indication of a plurality of transmission configuration indication (TCI) states; and a control unit that determines, on the basis of the indication and a configuration related to a coherent joint transmission (CJT), a quasi-co-location (QCL) relationship between a reference signal in at least one of the plurality of TCI states and a demodulation reference signal (DMRS) port of a physical downlink shared channel (PDSCH) that is transmitted by using the CJT. According to one aspect of the present disclosure, communication can be appropriately performed even when a CJT using a multi-TRP / multi-panel is supported.

Description

Terminal, wireless communication method and base station

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

[0002] Long Term Evolution (LTE) has been specified for the Universal Mobile Telecommunications System (UMTS) network 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, etc.) are also being considered.

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

[0005] In future wireless communication systems (e.g., NR), reporting of channel state information (CSI) based on reception of reference signals is being considered. Also, multiple transmission / reception points (TRPs, multi-TRP (MTRP)) or multiple panels (multiple panels, multi-panel) performing DL transmission to a terminal (user terminal, user equipment (UE)) is being considered. Coherent joint transmission (CJT) using multi-TRP / multi-panel is also being considered. Furthermore, in Rel. 18 and later, it is expected that CJT will also be applied in cases where the connection between TRPs is not ideal (e.g., non-ideal backhaul environments).

[0006] However, sufficient research has not been conducted on how to control communications (e.g., CSI reporting) in CJTs using multiple TRPs / multiple panels.

[0007] Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can properly communicate even when CJT using multi-TRP / multi-panel is supported.

[0008] A terminal according to one aspect of the present disclosure is characterized by having a receiving unit that receives instructions of a plurality of Transmission Configuration Indication (TCI) states, and a control unit that determines, based on settings related to Coherent Joint Transmission (CJT) and the instructions, a Quasi-Co-Location (QCL) relationship between a Demodulation Reference Signal (DMRS) port of a Physical Downlink Shared Channel (PDSCH) transmitted using CJT and at least one reference signal of the plurality of TCI states.

[0009] According to one aspect of the present disclosure, communication can be performed appropriately even when CJT using multiple TRPs / multiple panels is supported.

[0010] FIGS. 1A and 1B illustrate an example of a unified / common TCI framework. FIGS. 2A and 2B illustrate an example of DCI-based TCI state indication. FIGS. 3A to 3D illustrate an example of multi-TRP. FIGS. 4A to 4C illustrate an example of application of indicated TCI states. FIG. 5 illustrates an example of mapping between TCI code points and multiple joint TCI states when multiple indicated TCI states (joint) are indicated. FIG. 6 illustrates an example of a UE performing DL reception from multiple TRPs. FIG. 7 illustrates an example of a UE performing DL reception from multiple TRPs. FIGS. 8A and 8B illustrate an example of QCL assumptions for CJT PDSCH according to embodiments 1.1 to 1.3. FIGS. 9A and 9B illustrate an example of QCL assumptions for CJT CSI-RS according to embodiments 2.1 to 2.3. FIG. 10 illustrates an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 11 illustrates an example of a base station configuration according to an embodiment. Fig. 12 is a diagram illustrating an example of a configuration of a user terminal according to an embodiment. Fig. 13 is a diagram illustrating an example of a hardware configuration of a base station and a user terminal according to an embodiment. Fig. 14 is a diagram illustrating an example of a vehicle according to an embodiment.

[0011] (TCI, spatial relationship, QCL) In NR, it is considered to control the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) in a UE of at least one of a signal and a channel (referred to as a signal / channel) based on a transmission configuration indication state (TCI state).

[0012] The TCI state may represent that which is applied to a downlink signal / channel, and the equivalent of the TCI state that is applied to an uplink signal / channel may be expressed as a spatial relation.

[0013] The TCI state is information about the Quasi-Co-Location (QCL) of signals / channels, and may also be called spatial reception parameters, spatial relation information, etc. The TCI state may be configured in the UE for each channel or signal.

[0014] The QCL is an index indicating the statistical properties of signals / channels. For example, if a signal / channel has a QCL relationship with another signal / channel, it may mean that it can be assumed that at least one of a Doppler shift, a Doppler spread, an average delay, a delay spread, and a spatial parameter (e.g., a spatial Rx parameter) is the same between these different signals / channels (i.e., the signals / channels have a QCL with respect to at least one of these).

[0015] The spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be identified based on a spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure may be replaced with sQCL (spatial QCL).

[0016] A plurality of types of QCLs (QCL types) may be defined. For example, four QCL types A to D may be provided, each having different parameters (or parameter sets) that can be assumed to be the same.

[0017] The UE's assumption that a Control Resource Set (CORESET), channel, or reference signal has a specific QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be referred to as a QCL assumption.

[0018] The UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal / channel based on the TCI condition or QCL assumption of the signal / channel.

[0019] The TCI state may be, for example, information about the QCL between the channel of interest (in other words, the Reference Signal (RS) for that channel) and another signal (e.g., another RS). The TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination thereof.

[0020] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0021] The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0022] Furthermore, the RS that has a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a sounding reference signal (SRS), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).

[0023] An SSB is a signal block including at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). An SSB may also be referred to as an SS / PBCH block.

[0024] An RS of QCL type X in a TCI state may refer to an RS that has a QCL type X relationship with a certain channel / signal (DMRS), and this RS may be called a QCL source of QCL type X in the TCI state.

[0025] Physical Layer Procedures for Data / Antenna Port QCL A UE can configure a list of up to M TCI-State settings in the higher layer parameter PDSCH-Config for PDSCH decoding according to a detected PDCCH with DCI intended for the UE and a given serving cell, where M depends on the UE capability maxNumberConfiguredTCIstatesPerCC.

[0026] Each TCI-State includes parameters for configuring a QCL relationship between one or two downlink reference signals and a DMRS port of a PDSCH, a DMRS port of a PDCCH, or a CSI-RS port of a CSI-RS resource, which is configured by the higher layer parameter qcl-Type1 for the first DL RS and the higher layer parameter qcl-Type2 for the second DL RS (if configured).

[0027] In the case of two DL RSs, the multiple QCL types are not the same, regardless of whether the references are to the same DL RS or to different DL RSs. The QCL type corresponding to each DL RS is given by the higher layer parameter qcl-Type in QCL-Info and takes one of the following values: - 'typeA': {Doppler shift, Doppler spread, average delay, delay spread} - 'typeB': {Doppler shift, Doppler spread} - 'typeC': {Doppler shift, average delay} - 'typeD': {Spatial Rx parameter}

[0028] RRC Protocol Specification / RRC IE / TCI-State The TCI-State associates one or two DL Reference Signals (RS) with a corresponding QCL type. If an additional physical cell identifier (PCI) is configured for that RS, it is set to the same value for both DL RSs.

[0029] (Unified / Common TCI Framework) The unified TCI framework allows multiple types of channels / RSs (UL / DL) to be controlled by a common framework. The unified TCI framework does not specify TCI states or spatial relationships for each channel as in Rel. 15. Instead, it may specify a common beam (common TCI state) and apply it to all UL and DL channels, or it may apply a common beam for UL to all UL channels and a common beam for DL ​​to all DL channels.

[0030] One common beam for both DL and UL, or one common beam for DL ​​and one common beam for UL (two common beams overall) are considered.

[0031] The UE may assume the same TCI state for UL and DL (joint TCI state, joint TCI pool, joint common TCI pool, joint TCI state set). The UE may assume different TCI states for UL and DL (separate TCI state, separate TCI pool, UL separate TCI pool and DL separate TCI pool, separate common TCI pool, UL common TCI pool and DL common TCI pool).

[0032] The default beams for UL and DL may be aligned via MAC CE based beam management (MAC CE level beam indication). The default TCI state of the PDSCH may be updated to align with the default UL beam (spatial relationship).

[0033] DCI-based beam management (DCI-level beam indication) may indicate a common beam / unified TCI state from the same TCI pool for both UL and DL (joint common TCI pool, joint TCI pool, set). X (>1) TCI states may be activated by the MAC CE. The UL / DL DCI may select one from the X active TCI states. The selected TCI state may apply to both UL and DL channels / RS.

[0034] The TCI pool (set) may be multiple TCI states configured by RRC parameters, or multiple TCI states (active TCI states, active TCI pools, sets) activated by MAC CE among the multiple TCI states configured by RRC parameters. Each TCI state may be a QCL type A / D RS. SSB, CSI-RS, or SRS may be configured as the QCL type A / D RS.

[0035] The number of TCI states corresponding to each of one or more TRPs may be specified. For example, the number N (≧1) of TCI states applied to UL channels / RSs (UL TCI states) and the number M (≧1) of TCI states applied to DL channels / RSs (DL TCI states) may be specified. At least one of N and M may be notified / configured / instructed to the UE via higher layer signaling / physical layer signaling.

[0036] In the present disclosure, when N=M=X (X is any integer), it may mean that X TCI states (joint TCI states) common to UL and DL (corresponding to X TRPs) are notified / configured / indicated to the UE. Also, when N=X (X is any integer) and M=Y (Y may be any integer, Y=X), it may mean that X UL TCI states (corresponding to X TRPs) and Y DL TCI states (i.e., separate TCI states) (corresponding to Y TRPs) are notified / configured / indicated to the UE.

[0037] For example, when N=M=1 is written, this may mean that a TCI state common to one UL and DL for a single TRP is notified / configured / indicated to the UE (joint TCI state for a single TRP).

[0038] Also, for example, when N=1 and M=1 are written, this may mean that one UL TCI state and one DL TCI state for a single TRP are separately notified / configured / instructed to the UE (separate TCI states for a single TRP).

[0039] Also, for example, when N=M=2 is written, this may mean that a TCI state common to multiple (two) ULs and DLs for multiple (two) TRPs is notified / configured / instructed to the UE (joint TCI state for multiple TRPs).

[0040] Also, for example, when N=2 and M=2, it may mean that multiple (two) UL TCI states and multiple (two) DL TCI states for multiple (two) TRPs are notified / configured / instructed to the UE (separate TCI states for multiple TRPs).

[0041] In the above example, the values ​​of N and M are 1 or 2, but the values ​​of N and M may be 3 or more, and N and M may be different.

[0042] It is being considered that N=M=1 will be supported in Rel. 17. It is being considered that other cases will be supported in Rel. 18 and later.

[0043] In the example of Figure 1A, RRC parameters (information elements) configure multiple TCI states for both DL and UL. The MAC CE may activate multiple TCI states from the configured multiple TCI states. A DCI may indicate one of the activated multiple TCI states. The DCI may be a UL / DL DCI. The indicated TCI state may apply to at least one (or all) of the UL / DL channels / RS. One DCI may indicate both UL TCI and DL TCI.

[0044] In the example of this figure, a point may be one TCI state that applies to both UL and DL, or two TCI states that apply to UL and DL respectively.

[0045] At least one of the multiple TCI states configured by the RRC parameters and the multiple TCI states activated by the MAC CE may be referred to as a TCI pool (common TCI pool, joint TCI pool, TCI state pool). The multiple TCI states activated by the MAC CE may be referred to as an active TCI pool (active common TCI pool).

[0046] In the present disclosure, higher layer parameters (RRC parameters) for setting multiple TCI states may be referred to as configuration information for setting multiple TCI states, or simply as "configuration information." Also, in the present disclosure, being instructed to set one of multiple TCI states using DCI may mean receiving indication information instructing one of the multiple TCI states included in DCI, or may simply mean receiving "instruction information."

[0047] In the example of Figure 1B, the RRC parameters configure multiple TCI states (joint common TCI pools) for both DL and UL. The MAC CE may activate multiple TCI states (active TCI pools) from the configured multiple TCI states. Separate active TCI pools for each of the UL and DL may be configured / activated.

[0048] The DL DCI or a new DCI format may select (indicate) one or more (e.g., one) TCI states. The selected TCI state may apply to one or more (or all) DL channels / RSs. The DL channels may be PDCCH / PDSCH / CSI-RS. The UE may determine the TCI state of each DL channel / RS using the TCI state behavior (TCI framework) of Rel. 16. The UL DCI or a new DCI format may select (indicate) one or more (e.g., one) TCI states. The selected TCI state may apply to one or more (or all) UL channels / RSs. The UL channels may be PUSCH / SRS / PUCCH. In this way, different DCIs may indicate UL TCI and DL DCI separately.

[0049] It is assumed that in Rel. 17 NR and later, the MAC CE / DCI supports beam activation / indication to a TCI state associated with a different physical cell identifier (PCI), and in Rel. 18 NR and later, the MAC CE / DCI supports indicating a serving cell change to a cell with a different PCI.

[0050] [Physical Layer Procedures for Data / Antenna Port QCL] In PDSCH-Config, the UE can configure a list of up to 128 DLorJointTCIState configurations to provide reference signals for PDSCH DMRS and PDCCH DMRS and CSI-RS within a CC, and also to provide a reference for determining the UL TX (Transmit) spatial filter for PUSCH and PUCCH resources and SRS within a CC based on dynamic and configuration grants, if available.

[0051] If there is no DLorJointTCIState or UL-TCIState (UL TCI state) configuration in the BWP in that CC, the UE may apply the DLorJointTCIState or UL-TCIState configuration from the reference BWP of the reference CC. If the UE has DLorJointTCIState or UL-TCIState configured in any CC in the same band, it does not assume that TCI-State, SpatialRelationInfo (spatial relation information), or PUCCH-SpatialRelationInfo (PUCCH spatial relation information) in that band are configured, except for SpatialRelationInfoPos (spatial relation information for position). The UE assumes that if the UE has TCI-State in any CC in the CC list configured by simultaneousTCI-UpdateList1-r16 (simultaneous TCI update list 1), simultaneousTCI-UpdateList2-r16 (simultaneous TCI update list 2), simultaneousSpatial-UpdatedList1-r16 (simultaneous spatial update list 1), or simultaneousSpatial-UpdatedList2-r16 (simultaneous spatial update list 2), the UE does not have DLorJointTCIState or UL-TCIState configured in any CC in that CC list.

[0052] The UE receives an activation command used to map up to eight TCI states and / or TCI state pairs, with one TCI state for DL ​​channels / signals and one TCI state for UL channels / signals, to codepoints in the DCI field 'Transmission Configuration Indication' (TCI) for one CC / DL BWP or set of CC / DL BWPs, if available. If a set of TCI state IDs is activated for a set of CC / DL BWPs, and also for one CC / DL BWP, if available, the same set of TCI state IDs applies to all DL and / or UL BWPs within the indicated CC, where the applicable list of CCs is determined by the CC indicated in the activation command. If the activation command maps DLorJointTCIState and / or UL-TCIState to only one TCI codepoint, the UE applies the indicated DLorJointTCIState and / or UL-TCIState to one or a set of CC / DL BWPs, and if the indicated mapping to one single TCI codepoint applies, the UE applies the indicated DLorJointTCIState and / or UL-TCIState to one or a set of CC / DL BWPs.

[0053] If the bwp-id or cell for a QCL type A / D source RS in the QCL-Info of a TCI state with DLorJointTCIState set is not set, the UE shall assume that the QCL type A / D source RS is set in the CC / DL BWP to which the TCI state applies.

[0054] (TCI State Indication) The Rel. 17 unified TCI framework supports the following modes 1 to 3: [Mode 1] MAC CE based TCI state indication [Mode 2] DCI based TCI state indication by DCI format 1_1 / 1_2 with DL assignment [Mode 3] DCI based TCI state indication by DCI format 1_1 / 1_2 without DL assignment

[0055] A UE with a TCI state configured and activated with a Rel. 17 TCI State ID (e.g., tci-StateId_r17) receives DCI format 1_1 / 1_2 providing an indicated TCI state with the Rel. 17 TCI State ID for one CC, or receives DCI format 1_1 / 1_2 providing an indicated TCI state with the Rel. 17 TCI State ID for all CCs in the same CC list as the CC list configured by simultaneous TCI update list 1 or simultaneous TCI update list 2 (e.g., simultaneousTCI-UpdateList1 or simultaneousTCI-UpdateList2). DCI format 1_1 / 1_2 may or may not be accompanied by a DL assignment if one is available.

[0056] If DCI format 1_1 / 1_2 does not carry a DL assignment, the UE can assume (verify) the following for that DCI: - the CS-RNTI is used to scramble the CRC for the DCI; - the values ​​of the following DCI fields (special fields) are set as follows: - the redundancy version (RV) field is all '1's; - the modulation and coding scheme (MCS) field is all '1's; - the new data indicator (NDI) field is 0; - the frequency domain resource assignment (FDRA) field is all '0's for FDRA type 0, or all '1's for FDRA type 1, or all '0's for Dynamic Switch (similar to PDCCH validation for release of DL semi-persistent scheduling (SPS) or UL grant type 2 scheduling).

[0057] Note that the DCI in the above-mentioned mode 2 / mode 3 may be referred to as beam instruction DCI.

[0058] In Rel. 15 / 16, if a UE does not support active BWP changes via DCI, the UE ignores the BWP indicator field. A similar behavior is considered for the relationship between support for Rel. 17 TCI states and the interpretation of the TCI field. It is considered that if a UE is configured with Rel. 17 TCI states, the TCI field will always be present in DCI format 1_1 / 1_2, and if the UE does not support TCI updates via DCI, the UE will ignore the TCI field.

[0059] In Rel. 15 / 16, whether or not a TCI field is present (TCI presence information in DCI, tci-PresentInDCI) is set for each CORESET.

[0060] The TCI field in DCI format 1_1 is 0-bit if the higher layer parameter tci-PresentInDCI is not enabled, and 3-bit otherwise. If the BWP indicator field indicates a BWP other than the active BWP, the UE shall follow the following behavior: [Action] If the higher layer parameter tci-PresentInDCI is not enabled for the CORESET used for the PDCCH carrying that DCI format 1_1, the UE shall assume that tci-PresentInDCI is not enabled for all CORESETs in the indicated BWP; otherwise, the UE shall assume that tci-PresentInDCI is enabled for all CORESETs in the indicated BWP.

[0061] The TCI field in DCI format 1_2 is 0 bit if the higher layer parameter tci-PresentInDCI-1-2 is not set, otherwise it is 1, 2 or 3 bits determined by the higher layer parameter tci-PresentInDCI-1-2. If the BWP indicator field indicates a BWP other than the active BWP, the UE shall follow the following actions. [Operation] If the higher layer parameter tci-PresentInDCI-1-2 is not set for the CORESET used for the PDCCH carrying that DCI format 1_2, the UE shall assume that tci-PresentInDCI is not enabled for all CORESETs in the indicated BWP; otherwise, the UE shall assume that tci-PresentInDCI-1-2 for all CORESETs in the indicated BWP is set with the same value as tci-PresentInDCI-1-2 set for the CORESET used for the PDCCH carrying that DCI format 1_2.

[0062] 2A shows an example of a DCI-based joint DL / UL TCI status indication, in which a TCI status ID indicating the joint DL / UL TCI status is associated with a value of the TCI field for the joint DL / UL TCI status indication.

[0063] 2B shows an example of DCI-based separate DL / UL TCI status indication. At least one TCI status ID, indicating a DL-only TCI status or indicating a UL-only TCI status, is associated with a value of the TCI field for the separate DL / UL TCI status indication. In this example, TCI field values ​​000 to 001 are associated with only one TCI status ID for DL, TCI field values ​​010 to 011 are associated with only one TCI status ID for UL, and TCI field values ​​100 to 111 are associated with both one TCI status ID for DL ​​and one TCI status ID for UL.

[0064] (Indicated TCI State / Configured TCI State) For Rel. 17 TCI states, unified / common TCI state may mean the Rel. 17 TCI state indicated using (Rel. 17) DCI / MAC CE / RRC (indicated Rel. 17 TCI state).

[0065] In the present disclosure, the terms indicated Rel. 17 TCI state, indicated TCI state, unified / common TCI state, TCI state applicable to multiple types of signals (channels / RS), and TCI state for multiple types of signals (channels / RS) may be interpreted interchangeably.

[0066] The indicated Rel. 17 TCI state may be shared with at least one of the UE-specific reception of PDSCH / PDCC (updated using Rel. 17 DCI / MAC CE / RRC), PUSCH of dynamic grant (DCI) / configured grant, and multiple (e.g., all) dedicated PUCCH resources. The TCI state indicated by DCI / MAC CE / RRC may be referred to as the indicated TCI state or the unified TCI state.

[0067] Regarding the Rel. 17 TCI state, a TCI state other than the unified TCI state may refer to a Rel. 17 TCI state configured using (Rel. 17) MAC CE / RRC (configured Rel. 17 TCI state). In this disclosure, the terms configured Rel. 17 TCI state, configured TCI state, TCI state other than the unified TCI state, and TCI state applied to a specific type of signal (channel / RS) may be interpreted interchangeably.

[0068] The configured Rel. 17 TCI state may not be shared with at least one of the UE-specific reception of PDSCH / PDCC (updated using Rel. 17 DCI / MAC CE / RRC), PUSCH of dynamic grant (DCI) / configured grant, and multiple (e.g., all) dedicated PUCCH resources. The configured Rel. 17 TCI state may be configured by RRC / MAC CE per CORESET / per resource / per resource set, and may not be updated even if the indicated Rel. 17 TCI state (common TCI state) is updated.

[0069] It is being considered that the indicated Rel. 17 TCI state will be applied to UE-specific channels / signals (RS), and that the UE will be notified by higher layer signaling (RRC signaling) whether the indicated Rel. 17 TCI state or the configured Rel. 17 TCI state will be applied to non-UE-specific channels / signals.

[0070] It is being considered that the RRC parameters for the configured Rel. 17 TCI state (TCI state ID) will have the same configuration as the RRC parameters for the TCI state in Rel. 15 / 16. It is also being considered that the configured Rel. 17 TCI state will be configured / instructed per CORESET / per resource / per resource set using RRC / MAC CE. It is also being considered that the UE will determine the configuration / instruction based on specific parameters.

[0071] It is considered that the UE updates the indicated TCI state and the configured TCI state separately. For example, if the unified TCI state for the indicated TCI state is updated, the UE may not update the configured TCI state. It is also considered that the UE may determine whether to update the configured TCI state based on a specific parameter.

[0072] Furthermore, regarding the PDCCH / PDSCH, it is being considered to use higher layer signaling (RRC / MAC CE) to switch whether the indication Rel. 17 TCI state is applied or not (the configured Rel. 17 TCI state is applied, or a TCI state configured separately from the indication Rel. 17 TCI state is applied).

[0073] Regarding intra-cell beam indication (TCI state indication), it is being considered to support Rel. 17 TCI state indication for a UE-specific CORESET and its associated PDSCH, and a non-UE-specific CORESET and its associated PDSCH.

[0074] Also, for inter-cell beam indication (e.g., L1 / L2 inter-cell mobility), it is being considered to support Rel. 17 TCI state indication for a UE-specific CORESET and its associated PDSCH.

[0075] In Rel. 15, whether to indicate the TCI state for CORESET #0 was up to the implementation of the base station. In Rel. 15, for CORESET #0 for which a TCI state is indicated, the indicated TCI state is applied. For CORESET #0 for which a TCI state is not indicated, the SSB and QCL selected at the time of the latest (most recent) PRACH transmission are applied.

[0076] In the unified TCI state framework for Rel. 17 and later, the TCI state for CORESET #0 is being considered.

[0077] For example, in the unified TCI state framework for Rel. 17 and later, whether or not to apply the indicated Rel. 17 TCI state associated with the serving cell for the Rel. 17 TCI state indication in CORESET #0 is configured by RRC for each CORESET, and if not, the legacy MAC CE / RACH signaling mechanism may be used.

[0078] Note that the CSI-RS associated with the Rel. 17 TCI state applied to CORESET #0 may be QCL'd with the SSB associated with the serving cell PCI (physical cell ID) (similar to Rel. 15).

[0079] For CORESET #0, a CORESET with a common search space (CSS), and a CORESET with a CSS and a UE-specific search space (USS), whether to follow the Rel. 17 TCI state may be configured for each CORESET by an RRC parameter. If the Rel. 17 TCI state is not configured to be followed for that CORESET, the configured Rel. 17 TCI state may be applied to that CORESET.

[0080] For non-UE-dedicated channels / RSs (except CORESET), whether to follow the indicated Rel. 17 TCI state may be configured by an RRC parameter for each channel / resource / resource set. If the indicated Rel. 17 TCI state is not configured for that channel / resource / resource set, the configured Rel. 17 TCI state may apply to that channel / resource / resource set.

[0081] (Channels / RSs to which the indicated TCI state applies) The indicated TCI state by the MAC CE / DCI may apply to the following channels / RSs:

[0082] [PDCCH] - If followUnifiedTCIState is configured for CORESET0, the indicated TCI state applies. Otherwise, the Rel. 15 specifications apply for that CORESET. That is, CORESET0 follows the TCI state activated by the MAC CE or is QCL'd with SSB. - For CORESETs with USS / CSS type 3 and index other than 0, the indicated TCI state always applies. - For CORESETs with index other than 0 and at least CSS type other than 3, if followUnifiedTCIState is configured, the indicated TCI state applies. Otherwise, the configured TCI state for that CORESET applies to that CORESET.

[0083] [PDSCH] - The indicated TCI state always applies to all UE-dedicated PDSCHs. - For non-UE-dedicated PDSCHs (PDSCHs scheduled by DCI in CSS), the indicated TCI state may apply if followUnifiedTCIState is set (for the CORESET of the PDCCH that schedules that PDSCH). Otherwise, the configured TCI state for that PDSCH applies to that PDSCH. If followUnifiedTCIState is not set for a PDSCH, whether a non-UE-dedicated PDSCH follows the indicated TCI state may depend on whether followUnifiedTCIState is set for the CORESET used to schedule that PDSCH.

[0084] [CSI-RS] For an A-CSI-RS for CSI acquisition or beam management, if followUnifiedTCIState is set (for CORESET of the PDCCH that triggers that A-CSI-RS), the indicated TCI state applies. For other CSI-RSs, the configured TCI state for that CSI-RS applies.

[0085] [PUCCH] - For all dedicated PUCCH resources, the indicated TCI state always applies.

[0086] [PUSCH] - For dynamic / configured grant PUSCH, the indication TCI state always applies.

[0087] [SRS] - When the SRS resource set for the A-SRS used for beam management and the A / SP / P-SRS used for codebook (CB) / non-codebook (NCB) / antenna switching is configured to follow the unified TCI state, the indicated TCI state is applied. For other SRSs, the configured TCI state in the SRS resource set is applied.

[0088] (Multi-TRP) In NR, one or more transmission / reception points (Transmission / Reception Points (TRP)) (multi-TRP) are considered to perform DL transmission to a UE using one or more panels (multi-panels). Also, it is considered that a UE performs UL transmission to one or more TRPs.

[0089] Note that multiple TRPs may correspond to the same cell identifier (ID), or different cell IDs, which may be physical cell IDs (e.g., PCIs) or virtual cell IDs.

[0090] 3A-3D illustrate an example of a multi-TRP scenario, assuming, but not limited to, that each TRP is capable of transmitting four different beams.

[0091] 3A shows an example of a case where only one TRP (TRP1 in this example) of multiple TRPs transmits to the UE (this may be referred to as single mode, single TRP, etc.). In this case, TRP1 transmits both control signals (PDCCH) and data signals (PDSCH) to the UE.

[0092] In this disclosure, single-TRP mode may refer to a mode in which multi-TRP (mode) is not set.

[0093] 3B shows an example of a case where only one TRP (TRP1 in this example) transmits control signals to the UE, and the multi-TRP transmits data signals (also called single master mode). The UE receives each PDSCH transmitted from the multi-TRP based on a single Downlink Control Information (DCI).

[0094] 3C shows an example of a case where each of the multi-TRPs transmits a part of the control signal to the UE, and the multi-TRPs transmit data signals (this may be called a master-slave mode). Part 1 of the control signal (DCI) may be transmitted in TRP1, and Part 2 of the control signal (DCI) may be transmitted in TRP2. Part 2 of the control signal may depend on Part 1. The UE receives each PDSCH transmitted from the multi-TRP based on these parts of the DCI.

[0095] 3D shows an example of a case where each of the multi-TRPs transmits a separate control signal to the UE, and the multi-TRPs transmit data signals (this may be called a multi-master mode). A first control signal (DCI) may be transmitted on TRP1, and a second control signal (DCI) may be transmitted on TRP2. The UE receives each PDSCH transmitted from the multi-TRP based on these DCIs.

[0096] When multiple PDSCHs from multiple TRPs as shown in Figure 3B (which may also be referred to as multiple PDSCHs) are scheduled using one DCI, the DCI may be referred to as a single DCI (S-DCI, single PDCCH). Also, when multiple PDSCHs from multiple TRPs as shown in Figure 4D are scheduled using multiple DCIs, these multiple DCIs may be referred to as multiple DCIs (M-DCI, multiple PDCCHs).

[0097] Each TRP in a multi-TRP may transmit a different transport block (TB) / code word (CW) / different layer, or each TRP in a multi-TRP may transmit the same TB / CW / layer.

[0098] Non-Coherent Joint Transmission (NCJT) is being considered as one form of multi-TRP transmission. In NCJT, for example, TRP1 modulates and layer-maps a first codeword to transmit a first PDSCH using a first number of layers (e.g., two layers) with a first precoding. TRP2 modulates and layer-maps a second codeword to transmit a second PDSCH using a second number of layers (e.g., two layers) with a second precoding.

[0099] Note that multiple PDSCHs (multi-PDSCHs) that are non-coherent may be defined as partially or completely overlapping in time and / or frequency domains, i.e., a first PDSCH from a first TRP and a second PDSCH from a second TRP may overlap in time and / or frequency resources.

[0100] The first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (QCL). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0101] In URLLC for multi-TRP, it is considered that PDSCH (transport block (TB) or codeword (CW)) repetition across multi-TRP is supported. Repetition schemes (URLLC schemes, e.g., Schemes 1, 2a, 2b, 3, and 4) across multi-TRP in the frequency domain, layer (spatial) domain, or time domain are supported. In Scheme 1, multiple PDSCHs from multi-TRP are space division multiplexed (SDM). In Schemes 2a and 2b, PDSCHs from multi-TRP are frequency division multiplexed (FDM). In Scheme 2a, the redundancy version (RV) is the same for multi-TRP. In Scheme 2b, the RVs for multi-TRP may be the same or different. In schemes 3 and 4, multiple PDSCHs from multiple TRPs are time division multiplexed (TDM). In scheme 3, multiple PDSCHs from multiple TRPs are transmitted in one slot. In scheme 4, multiple PDSCHs from multiple TRPs are transmitted in different slots.

[0102] Such a multi-TRP scenario allows for more flexible transmission control using good quality channels.

[0103] NCJT using multiple TRPs / panels may use high rank. To support ideal and non-ideal backhaul between multiple TRPs, both single DCI (single PDCCH, e.g., FIG. 3B) and multiple DCI (multiple PDCCH, e.g., FIG. 3D) may be supported. For both single DCI and multiple DCI, the maximum number of TRPs may be two.

[0104] For single PDCCH design (mainly for ideal backhaul), TCI extension is being considered. Each TCI codepoint in the DCI may correspond to one or two TCI states. The TCI field size may be the same as that of Rel. 15.

[0105] For PDCCH / CORESET specified in Rel. 15, one TCI state without CORESETPoolIndex (also referred to as TRP Info) is set to one CORESET.

[0106] Regarding the PDCCH / CORESET enhancements specified in Rel. 16, in multi-TRP based on multi-DCI, a CORESET pool index is configured for each CORESET.

[0107] (TCI Selection Field) A specific field (new DCI field) may be included in a DCI format for scheduling / activating / triggering DL channels / signals (for example, DCI format 1_1 / 1-2 (which may be referred to as DL DCI)).

[0108] The specific field may be a field indicating that one or more (e.g., both / two) indicated TCI states (joint / DL TCI states) are to be applied to the DL channel / signal to be scheduled / activated / triggered. In other words, the specific field may be a field indicating the number / order of the indicated TCI states to be applied.

[0109] The particular field may be represented by a particular number of bits (for example, 2 bits).

[0110] In the present disclosure, this particular field may be referred to as a TCI selection field, but the name is not limited to this.

[0111] If the offset (hereinafter, this may be referred to as a scheduling offset, a triggering offset, etc.) between the reception of the DL DCI and the reception of the corresponding DL channel / signal is smaller than a certain threshold, the UE may buffer the received signal using the indicated TCI state (joint / DL TCI state).

[0112] When a DL channel / signal is scheduled / triggered by a first DCI format (e.g., DCI format 1_0), if a single frequency network (SFN) scheme (e.g., an SFN scheme for PDSCH (RRC parameter sfnSchemePdsch)) is configured, multiple (e.g., both / two) indicated TCI states (joint / DL TCI states) may be applied to the DL channel / signal. Otherwise, one (e.g., first) indicated TCI state (joint / DL TCI state) may be applied to the DL channel / signal.

[0113] If a DL channel / signal is scheduled by a second DCI format (e.g., DCI format 1_1 / 1_2) that does not include a specific field, multiple (e.g., both / two) indicated TCI states (joint / DL TCI states) may be applied to the DL channel / signal.

[0114] 4A-4C are diagrams illustrating other examples of application of the indicated TCI states. In the example shown in FIG. 4A, two indicated TCI states (TCI state #1 as the first TCI state and TCI state #2 as the second TCI state) are indicated to the UE.

[0115] In the example shown in Figure 4B, the DL DCI includes a field (TCI selection field) indicating the number / order of the indicated TCI states to be applied. Code point "00" in this field indicates that the first indicated TCI state is applied. Code point "01" in this field indicates that the second indicated TCI state is applied. Code point "10" in this field indicates that both the first indicated TCI state and the second indicated TCI state are applied. Code point "11" in this field is unused.

[0116] Figure 4C shows an example where PDSCH is scheduled by DL DCI, which includes a TCI selection field indicating codepoint "00", so that the UE applies TCI state #1 for PDSCH reception (see Figure 4C).

[0117] If the offset between the reception of the scheduling / triggering DL DCI and the reception of the scheduled / triggered DL channel / signal is greater than (or equal to or greater than) a certain threshold, a certain DCI field (e.g., a TCI selection field) may indicate the channel / signal to which the indicated TCI state is to be applied. In this case, the operation may be at least one of the following operation 1 and operation 2.

[0118] The specific threshold may be, for example, at least one of an existing threshold (defined up to Rel. 15 / 16) and a value based on RRC parameters / UE capability information defined in Rel. 17 / 18 or later.

[0119] The existing threshold may be, for example, a value based on UE capability information specified in Rel. 15 in the second frequency range (e.g., FR2).

[0120] In a first frequency range (eg, FR1), the particular DCI field may always be included in the DCI.

[0121] [Operation 1] A specific field (eg, a TCI selection field) may be included in the DL DCI if a specific RRC parameter is configured.

[0122] When the code point of a specific field included in a DL DCI (e.g., DCI format 1_1 / 1_2) indicates a first value (e.g., “00”), the UE may apply a specific indicated TCI state (e.g., a first indicated (joint / DL) TCI state) to multiple (e.g., all) DL channels / signals (e.g., PDSCH DMRS ports of multiple (all) PDSCH transmission opportunities) scheduled / triggered by the DCI.

[0123] When the code point of a specific field included in a DL DCI (e.g., DCI format 1_1 / 1_2) indicates a second value (e.g., “01”), the UE may apply a specific indicated TCI state (e.g., a second indicated (joint / DL) TCI state) to multiple (e.g., all) DL channels / signals (e.g., PDSCH DMRS ports of multiple (all) PDSCH transmission opportunities) scheduled / triggered by the DCI.

[0124] When the code point of a specific field included in a DL DCI (e.g., DCI format 1_1 / 1_2) indicates a third value (e.g., “10”), the UE may apply multiple indication TCI states (e.g., both the first indication (joint / DL) TCI state and the second indication (joint / DL) TCI state) to reception of a DL channel / signal scheduled / triggered by the DCI.

[0125] For example, when the code point of a specific field included in a DL DCI (e.g., DCI format 1_1 / 1_2) indicates a third value (e.g., "10"), the multiple indicated TCI states may be applied in a first order (e.g., the first indicated TCI state, then the second indicated TCI state).

[0126] The above operation 1 may be applied in a specific condition, for example, if (if applicable) the offset between at least the reception of the scheduling / triggering DL DCI and the reception of the scheduled / triggered DL channel / signal is greater than or equal to a specific threshold.

[0127] [Operation 2] A DL channel / signal may be scheduled / triggered by a DL DCI that does not include a specific field (e.g., a TCI selection field). The UE may apply one or more specific indication TCI states to the DL channel / signal.

[0128] In this case, the UE may be configured to apply one or more indicated TCI states using higher layer signaling (RRC / MAC CE) (options 0-1). For example, the UE may be configured using specific RRC parameters to apply either a first indicated TCI state, a second indicated TCI state, or both to reception of DL channels / signals.

[0129] Also in this case, the UE may decide to apply the first (or second) indicated TCI state to the reception of the DL channel / signal (option 0-2).

[0130] Also, in this case, the UE may decide to apply multiple indicated TCI states (e.g., both the first indicated TCI state and the second indicated TCI state) to reception of the DL channel / signal (options 0-3).

[0131] In this case, the UE may also decide to apply to the DL channel / signal the same indicated TCI state as the indicated TCI state of the PDCCH corresponding to the DL DCI that scheduled the DL channel / signal (options 0-4).

[0132] Also in this case, the UE may apply an indicated TCI state for one or more TRPs, which may be determined using the existing TCI fields (options 0-5).

[0133] The above operation 2 may be applied under certain conditions, for example, when (if applicable) the offset between at least the reception of the scheduling / triggering DL DCI and the reception of the scheduled / triggered DL channel / signal is greater than or equal to a certain threshold (e.g., "timeDurationForQCL").

[0134] (Rel. 18 Unified TCI State) In Rel. 18, it is being considered to introduce a case where a multi-TRP (e.g., single DCI-based multi-TRP (single DCI multi-TRP) / multiple DCI-based multi-TRP (multi-DCI multi-TRP)) is configured and a unified TCI state is applied.

[0135] In Rel. 18, it is assumed that the TCI state activation command (MAC CE) indicates whether each joint / separate (DL / UL) TCI state mapped to a TCI codepoint is the first or second joint / separate (DL / UL) TCI state (see Figure 5).

[0136] Figure 5 shows an example of TCI states mapped to TCI code points when the same (or common) indicated TCI state is applied / supported for DL ​​and UL (joint). For example, in a single DCI-based multi-TRP, one DCI (or MAC CE) may indicate one or two joint TCI states. The number of indicated TCI states may be determined based on the DCI (e.g., TCI state selection field) / RRC.

[0137] For example, a first indicated TCI state (e.g., a unified TCI state corresponding to a first TRP) and a second indicated TCI state (e.g., a unified TCI state corresponding to a second TRP) may be indicated. When the indication / application of multiple indicated TCI states corresponding to multiple (e.g., two) TRPs is supported, it is assumed that the indicated TCI states applied to each TRP are updated (or newly indicated) according to the communication situation / communication environment.

[0138] (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, feedback, etc.) the generated CSI to a network (e.g., a base station). The CSI may be transmitted to the base station, for example, using 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)).

[0139] 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.

[0140] The CSI-RS may include at least one of a non-zero power (NZP) CSI-RS and a CSI-Interference Management (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 include at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS).

[0141] 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), a Layer Indicator (LI), a Rank Indicator (RI), L1-RSRP (Layer 1 Reference Signal Received Power), L1-RSRQ (Reference Signal Received Quality), L1-SINR (Signal to Interference plus Noise Ratio), L1-SNR (Signal to Noise Ratio), and the like.

[0142] 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, a "CSI-ReportConfig" information element (IE) of Radio Resource Control (RRC).

[0143] The reporting configuration information (e.g., "CSI-ReportConfig" of the RRC IE) may include, for example, at least one of the following: ◆ Information on the type of CSI report (report type information, e.g., "reportConfigType" of the RRC IE) ◆ Information on one or more quantities of CSI to be reported (one or more CSI parameters) (report quantity information, e.g., "reportQuantity" of the RRC IE) ◆ Information on the RS resources used to generate the quantities (the CSI parameters) (resource information, e.g., "CSI-ResourceConfigId" of the RRC IE) ◆ Information on the frequency domain to be used for CSI reporting (frequency domain information, e.g., "reportFreqConfiguration" of the RRC IE)

[0144] For example, the report type information may indicate a periodic CSI (P-CSI) report, an aperiodic CSI (A-CSI) report, or a semi-persistent CSI (SP-CSI) report.

[0145] 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.).

[0146] The resource information may also be an ID of a resource for the RS. The resource for the RS may include, for example, a non-zero-power CSI-RS resource or an SSB, and a CSI-IM resource (for example, a zero-power CSI-RS resource).

[0147] The frequency domain information may also indicate frequency granularity of the CSI report. 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 the CSI reporting band, the entire CSI reporting band, etc.

[0148] 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).

[0149] The frequency domain information may indicate whether wideband or subband PMI is to be reported (the frequency domain information may include, for example, 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 CSI reporting (i.e., whether wideband PMI reporting or subband PMI reporting is to be performed) based on at least one of the reporting amount information and the frequency domain information.

[0150] 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., a subband indication for each subband) may be reported for each of one or more subbands within the entire CSI reporting band.

[0151] The UE performs channel estimation using the received RS to estimate a channel matrix H. The UE feeds back a PMI determined based on the estimated channel matrix.

[0152] 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).

[0153] 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 does not assume multi-user multiple input multiple output (MU-MIMO), while Type 2 CSI may assume multi-user MIMO.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] In Rel. 15 NR, UCI may contain one CSI part for wideband PMI feedback. CSI report #n contains PMI wideband information if reported.

[0158] 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.

[0159] 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 resource 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 resource 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).

[0160] For both FR1 and FR2, evaluation and provision of CSI reporting for DL ​​multi-TRP and / or multi-panel transmissions is under consideration to enable more dynamic channel / interference hypotheses for NCJT.

[0161] (Codebook Configuration) 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 report configuration (CSI-ReportConfig) of the higher layer (RRC) parameters.

[0162] In the codebook setting, at least one codebook is selected from a plurality of codebooks including type 1 single panel (type I-Single Panel), type 1 multi-panel (type I-Multi Panel), type 2 (type II), and type 2 port selection (type II-Port Selection).

[0163] The codebook parameters include a parameter related to the codebook subset restriction (CBSR) ("...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.

[0164] (CSI Reporting Configuration) The CSI reporting configuration (CSI-ReportConfig) of Rel. 16 includes a channel measurement resource (CMR), an interference measurement resource (IMR), etc. in addition to a codebook configuration (CodebookConfig). 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). Of the parameters of CSI-ReportConfig, parameters excluding codebookConfig-r16 are also included in the CSI reporting configuration of Rel. 15.

[0165] 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.

[0166] Rel. 17 considers an extended CSI reporting configuration (CSI-ReportConfig) for CSI measurement / reporting of multi-TRP using NCJT. In this CSI reporting configuration, two CMR groups corresponding to two TRPs are configured. CMRs in a CMR group may be used for at least one of multi-TRP and single-TRP measurements using NCJT. N CMR pairs of NCJT are configured by RRC signaling. The UE may be configured by RRC signaling whether to use a CMR of a CMR pair for single-TRP measurements.

[0167] For CSI reporting related to multi-TRP / panel NCJT measurements configured by a single CSI reporting configuration, it is considered that at least one of the following options 1 and 2 will be supported.

[0168] <Option 1> The UE is configured to report X (X=0, 1, 2) CSIs related to single-TRP measurement hypotheses / hypotheses and one CSI related to NCJT measurements. If X=2, the two CSIs are related to two different single-TRP measurements using CMRs from different CMR groups.

[0169] <Option 2> The UE may be configured to report one CSI associated with the best measurement result among the measurement hypotheses for NCJT and single TRP.

[0170] As described above, in Rel. 15 / 16, the CBSR is configured per codebook configuration per CSI reporting configuration, i.e., the CBSR applies to all CMRs, etc. within the corresponding CSI reporting configuration.

[0171] However, in the CSI reporting configuration for multi-TRP in Rel. 17 with CSI reporting settings, if the above-mentioned options 1 and 2 are applied, the following measurement configurations may be made: ◆ Option 1 (X = 0): Measurement of NCJT CSI only. ◆ Option 1 (X = 1): Measurement of NCJT CSI and CSI of a single TRP (one TRP). ◆ Option 1 (X = 2): Measurement of NCJT CSI and CSI of a single TRP (two TRPs). ◆ Option 2: Measurement of both NCJT CSI and CSI of a single TRP.

[0172] The multiple subbands for a given CSI report #n as indicated by the upper layer parameter csi-ReportingBand may be numbered consecutively in ascending order, with the lowest subband of csi-ReportingBand as subband 0.

[0173] (PMI / Type 1 Codebook) Type 1 (type I) codebook (Rel. 15) specifies a type 1 single panel codebook and a type 1 multi-panel codebook for base station panels. In the type 1 single panel, the antenna model (antenna setting) of the CSI antenna port array (logical setting) is specified for (N1, N2). The number of CSI-RS antenna ports P CSI-RS In Type 1 multi-panel, the number of CSI-RS antenna ports P CSI-RS and (N g , N1, N2), an antenna model of the CSI antenna port array (logical configuration) is specified.

[0174] In the present disclosure, the first dimension, the N1 dimension, one of the horizontal domain and the vertical domain, and the horizontal domain may be interchanged. In the present disclosure, the second dimension, the dimension perpendicular to the first dimension, the N2 dimension, the other of the horizontal domain and the vertical domain, and the vertical domain may be interchanged. In the present disclosure, N1 and N2 may be interchanged, and the horizontal domain and the vertical domain may be interchanged.

[0175] In the present disclosure, the terms port, antenna port, CSI-RS port, port index, and port number may be interchangeable.

[0176] In the present disclosure, (N1, N2), the two-dimensional number of antenna ports, antenna configuration, and base station antenna layout may be interpreted interchangeably. g The number of panels, the number of antenna groups, and the number of antenna port groups may be read interchangeably.

[0177] In the present disclosure, two polarizations, a first polarization and a second polarization, and a horizontal polarization and a vertical polarization may be interchangeable. In the present disclosure, one polarization, one of a first polarization and a second polarization, and one of a horizontal polarization and a vertical polarization may be interchangeable. In the present disclosure, co-phasing, phase difference, phase compensation between polarizations, and φ may be interchangeable.

[0178] In the present disclosure, the terms Type 1 codebook, Type 1 single-panel codebook, and Type 1 multi-panel codebook may be read interchangeably.

[0179] (Type 1 Single Panel Codebook) For Rel. 15 Type 1 Single Panel CSI, the UE sets the codebook type upper layer parameter (subType in type1 in codebookType in CodebookConfig) to Type 1 Single Panel ('typeI-SinglePanel'). If the number of layers v is not {2,3,4}, the PMI value is calculated based on the three codebook indices i 1,1 ,i 1,2 , i2. When the number of layers v∈{2,3,4}, the PMI values ​​correspond to the four codebook indices i 1,1 ,i 1,2 ,i 1,3 , i2. If the number of layers v is not {2,3,4}, then the composite codebook index i1 = [i 1,1 i 1,2 ]. When the number of layers v∈{2,3,4}, the composite codebook index i1=[i 1,1 i 1,2 i 1,3 ].

[0180] P CSI-RS The supported (N1,N2) and (O1,O2) settings (combinations of values) are defined in the specification. (N1,N2) indicate the number of two-dimensional (2D) antenna elements and are set by the upper layer parameters n1-n2 in moreThanTwo in nrOfAntennaPorts in typeI-SinglePanel. n1-n2 are bitmap parameters with N1O1N2O2 bits. (O1,O2) are the 2D oversampling factors.

[0181] The precoding matrix for v=1 is W l,m,n (v) The precoding matrix for v=2 is W l,l',m,m',n (v) It is expressed as P CSI-RS The precoding matrix for <16 and v=3,4 is W l,l',m,m',n (v) It is expressed as P CSI-RSThe precoding matrix for ≥ 16 and v = 3, 4 is W l,m,p,n (v) The precoding matrix for v=5,6 is W l,l',l'',m,m',m'',n (v) The precoding matrix for v=7,8 is Wl,l',l'',l''',m,m',m'',m''',n (v) l,l',l'',l''' are expressed as 1,1 and k1. m, m', m'', and m''' are determined by i 1,2 and k2. n is determined by i2. p is determined by P CSI-RS Of the (≧16) ports, the first half of the ports are 0 and the second half of the ports are 1.

[0182] The precoding matrix W can be expressed as the product of two matrices, W1W2, where W1 represents the wideband and long-term channel properties and the codebook index i1 (e.g., i 1,1 and i 1,2 ) is expressed by i 1,1 and i 1,2 and denote the beam selection in two dimensions, respectively. W2 denotes frequency selectivity (subband) and short-term channel characteristics and is represented by codebook index i2. i2 may denote the phase adjustment between the two polarizations. W1 may be given by the following equation E1 using matrix B:

[0183] B shows L 2D DFT beams, each oversampled by (O1, O2).

[0184] If the rank is {1, 5, 6, 7, 8}, the codebook index for each PMI is i 1,1 , i 1,2 , i2. If the rank is {2, 3, 4}, the codebook index for each PMI is i 1,1 , i 1,2 , i 1,3 , i2. i 1,3is mapped to k1 and k2 according to a table in the specification. For rank=2, 3, 4, the beams selected for different layers can be different when generating PMI.

[0185] The codebook for 1-layer CSI reporting and codebookMode=1 is index i corresponding to the horizontal component of the beam. 1,1 = l=0,1,...,N1O1-1 and the index i corresponding to the vertical component of the beam 1,2 = m = 0, 1, ..., N2O2-1 and indices i2 = n = 0, 1, 2, 3 corresponding to the subbands. Antenna ports 3000 to 2999+P CSI-RS Precoding matrix W for one-layer CSI reporting with l,m,n (1) is given by the following equation E2:

[0186] φ for the precoding matrix n , θ p , u m , v l,m , v ~ l,m is given by the following equation E3:

[0187] where [i 1,1 ,i 1,2 ,i2]=[l,m,n]. l,m is an N1-by-N2 DFT vector (spatial domain (SD) vector, 2D-DFT vector, SD DFT vector, SD basis vector, SD beam), expressed as exp(j2πln1 / O1N1)×exp(j2πmn2 / O2N2), n1=0,1,...,N1-1, n2=0,1,...,N2-1, and specified by v, l. l,m indicates one beam. The phase adjustment φ between the two polarizations n θ = exp(jπn / 2), which indicates the difference in phase of the second polarization relative to the phase of the first polarization. p indicates the phase of the second half port relative to the phase of the first half port.

[0188] (Type 1 Multi-Panel Codebook) For Rel. 15 Type 1 multi-panel CSI, the UE sets the codebook type upper layer parameter (subType in type1 in codebookType in CodebookConfig) to Type 1 multi-panel ('typeI-MultiPanel'). For Rel. 15 Type 1 multi-panel CSI, compared to Type 1 single-panel codebook, the number of panels N in addition to N1 and N2 is increased. g Compared with the Type 1 single-panel codebook, the (wideband) inter-panel co-phasing (phase compensation between panels) is set as i, 1,4 The same SD beam (DFT vector v l,m , SD basis indices l,m) are selected and only the inter-panel phase differences are added and reported.

[0189] P CSI-RS Supported (N g The settings (combination of values) of (N1,N2) and (O1,O2) are defined in the specification. (N1,N2) are set by ng-n1-n2 in typeI-MultiPanel. i 1,1 =l={0,1,...,N1O1-1} is the horizontal component of the oversampled SD basis. 1,2 =m={0,1,...,N2O2-1} is the vertical component of the oversampled SD basis. q=1,...,N g i to -1 1,4,q =p={0,1,2,3} is the number of panels. i2=n={0,1,2,3} is the number of beams per panel.

[0190] The antenna configuration parameters for the Type 1 multi-panel codebook are ng-n1-n2 (N g , N1, N2). In the existing specifications, ranks up to 4 are supported, and ranks 5 and above are not supported.

[0191] Each PMI value corresponds to a codebook index i1, i2. v is the RI value (number of layers). For v=1, i1=[i 1,1 i 1,2 i 1,4 ]. For v∈{2,3,4}, i1=[i 1,1 i 1,2 i 1,3 i 1,4 ].

[0192] When the codebook mode is set to 1, N g = 2, i 1,4 =i 1,4,1 N g = 4, i 1,4 =[i 1,4,1 i 1,4,2 i 1,4,3 ]. When the codebook mode is set to 2, i 1,4 =[i 1,4,1 i 1,4,2 ]. i 1,4 is the number of panels N g and codebook mode. N g Codebook mode 2 is supported only for [i 1,4,1 i 1,4,2 ] correspond to two polarizations, respectively. Each of the two values ​​represents the wideband phase difference of the second panel (Panel 1) relative to the first panel (Panel 0) in the corresponding polarization. N g = 2 and i in codebook mode 1 1,4 Only one value is reported, which represents the wideband retardation of the second panel (Panel 1) relative to the first panel (Panel 0).

[0193] When the codebook mode is set to 2, i2 = [i 2,0 i 2,1 i 2,2]. The number and value of i2 are related to the codebook mode and may be different from the Type 1 single panel codebook. If subband reporting is configured, i2 is the index for the subband. If wideband reporting is configured, i2 is the index for the wideband. In codebook mode 1, the number and value of i2 are the same as in the Type 1 single panel codebook, and i2 has one value for each subband. In codebook mode 2 (N g =2), the phase difference between the subbands has three values, representing the phase difference between the polarizations and between the panels.

[0194] Codebook mode 2 has a larger feedback overhead because it reports more phase differences for more accurate CSI. g Only supported for =2.

[0195] The Type-1 multi-panel codebook is based on the Type-1 single-panel codebook. In the Type-1 multi-panel codebook, the codebook for the first panel (Panel 0) follows the Type-1 single-panel codebook. The codebooks for the other panels apply the same precoder, with additional phase differences between the panels.

[0196] φ for the precoding matrix n , a p , b p , u m , v l,m is given by the following equation E4:

[0197] Antenna ports 3000 to 2999+P CSI-RS The precoding matrix for v-layer CSI reporting using (v) The number of panels in the i-th layer is N. g , the precoding matrix for codebook mode X is W l,m,p,n i,N_g,X It is expressed by [i 1,1 ,i 1,2 ,i 1,4,i2]=[l,m,p,n].

[0198] Codebook modes 1 and N g = {2, 4}, the precoding matrix W for 1-layer CSI reporting l,m,p,n (1) is W l,m,p,n 1,N_g,1 The codebook modes 1 and N are represented by g = {2,4}, the precoding matrix W for 2-layer CSI reporting l,l',m,m',p,n (2) is (1 / sqrt(2))[W l,m,p,n (1,N_g,1) W l',m',p,n (2,N_g,1) ] where N g =W for {2,4} l,m,p,n 1,N_g,1 and W l,m,p,n 2,N_g,1 (N g W for =2 l,m,p,n 1,2,1 and W l,m,p,n 2,2,1 And, N g W for =4 l,m,p,n 1,4,1 and W l,m,p,n 2,4,1 and ) are given by the following equation E5:

[0199] where φ n =e jπn / 2 N g =2, p=p1, and N g For φ = 4, p = [p1, p2, p3]. p_1 , φ p_2 , φ p_3 represents the inter-panel phase difference (inter-panel phase compensation). In each precoding matrix, the first and second rows correspond to the first panel (panel 0), the third and fourth rows correspond to the second panel (panel 1), the fifth and sixth rows correspond to the third panel (panel 2), and the seventh and eighth rows correspond to the fourth panel (panel 3). Since the same SD beam is selected for all panels, each row has the same v l,m φ p_1represents the phase difference of the second panel relative to the first panel. p_2 represents the phase difference of the third panel relative to the first panel. p_3 represents the phase difference of the fourth panel relative to the first panel.

[0200] Codebook modes 2 and N g = 2, the precoding matrix W for 1-layer CSI reporting l,m,p,n (1) is W l,m,p,n 1,2,1 The codebook modes 2 and N g = 2, the precoding matrix W for two-layer CSI reporting l,l',m,m',p,n (2) is (1 / sqrt(2))[W l,m,p,n 1,2,2 W l',m',p,n 2,2,2 ] where W l,m,p,n 1,2,2 and W l,m,p,n 2,2,2 is given by the following equation E6:

[0201] In each precoding matrix, the first and second rows correspond to the first panel (panel 0), and the third and fourth rows correspond to the second panel (panel 1). Since the same SD beam is selected for all panels, each row has the same v l,m p = [p1 p1] and n = [n0, n1, n2]. p_1 represents the phase difference of the second panel (panel 1) relative to the first panel (panel 0) in the first polarization. p_2 represents the phase difference of the second panel (panel 1) relative to the first panel (panel 0) in the second polarization. n_0 represents the phase difference of the second polarization of the first panel relative to the first polarization of the first panel for each subband. n_1 represents the phase difference of the first polarization of the second panel relative to the first polarization of the first panel for each subband. n_2 represents the phase difference of the second polarization of the second panel relative to the first polarization of the first panel for each subband.

[0202] (PMI / Type 2 Codebook) In the present disclosure, the terms Type 2 (type II) codebook, extended Type 2 codebook, Type 2 port selection (PS) codebook, extended Type 2 PS codebook, additional extended Type 2 port PS codebook, codebook for CJT, and codebook for Doppler may be interpreted interchangeably.

[0203] (Type II Codebook) For a type II codebook (Rel. 15, type II CSI), the UE is configured with the upper layer parameter codebookType set to 'type II'.

[0204] In this disclosure, a matrix Z with X rows and Y columns may be expressed as Z(X×Y).

[0205] In Rel. 15, Type 2 CSI, for a given layer l, the subband-wise (SB-wise) precoding matrix is ​​based on the following equation F1: l (N t ×N3) = W1W 2,l (F1)

[0206] N t is the number of antennas / antenna ports. N3 is the total number of precoding (beamforming) matrices (precoders) indicated by the PMI (number of subbands).

[0207] W1(N t ×2L) are 2L DFT vectors (oversampled DFT vectors) and indicate the selected spatial domain basis. L∈{2,4} is the number of beams per layer. The actual number of beams considering two polarizations at one location is 2L. For example, the DFT vectors of L=2 SD beams are respectively b i ,b j It may also be expressed as:

[0208] W 2,l (2L×N3) is a matrix (LC coefficient matrix) consisting of linear combination coefficients (subband complex LC coefficients, coupling coefficients) for layer l.2,l represents the beam selection and the co-phasing between the two polarizations. For example, for L=2 SD beams b i ,b j The LC coefficients corresponding to i ,c j For example, the channel vector h is a linear combination of L=2 SD beams, c i b i ,+c j b j The feedback overhead is mainly due to the LC coefficient matrix W 2,l Also, Type 2 CSI in Rel. 15 only supports ranks 1 and 2.

[0209] In Type-2 CSI, the channel (channel matrix) for a user is represented by a linear combination of two polarizations and L SD beams. Type-2 CSI in Rel. 15 supports ranks 1 and 2.

[0210] ((Enhanced Type 2 Codebook (Rel. 16))) For Rel. 16 Type 2 CSI (enhanced Type 2 codebook), the UE is configured with the upper layer parameter codebookType set to 'typeII-r16'.

[0211] Type 2 CSI in Rel. 16 uses frequency domain (FD) compression to compress the LC coefficient matrix W 2,l Rel. 16 Type 2 CSI supports ranks 3 and 4 in addition to ranks 1 and 2.

[0212] In Rel. 16 Type 2 CSI, the precoding matrix W for a given layer l is l is expressed by the following formula F2: l = W1W ~ l W f,l H (F2)

[0213] W in Type 2 CSI of Rel. 15 2,l is W ~ l W f,l H It is approximated by the matrix W ~ may be expressed by adding ~ to the W. ~ l is W ~ 2,l It can also be expressed as W f,l H is W f,l is the adjoint matrix of W f,l is obtained by the conjugate transpose of

[0214] For CSI reporting, the UE may be configured with one of two subband sizes: N PRB SB The number of PMI subbands per CQI subband, R, is defined as consecutive PRBs and may depend on the total number of PRBs in the BWP. The number of PMI subbands per CQI subband, R, is configured by the RRC IE (numberOfPMI-SubbandsPerCQI-Subband). R controls the total number of precoding matrices, N, represented by the PMI, as a function of the number of subbands configured in the csi-ReportingBand, the subband size configured by subbandSize, and the total number of PRBs in the BWP.

[0215] W1(N t ×2L) denotes the 2L DFT vectors. To represent this matrix, the indices of the SD basis and the two-dimensional over-sampling factor are reported.

[0216] W ~ l (2L×M v ) is the LC coefficient matrix. To represent this matrix, up to K0 non-zero coefficients (NZCs, LC coefficients with non-zero amplitude) are reported. The report consists of two parts: a bitmap indicating the NZC positions and the quantized NZCs.

[0217] W f,l (N3×M v ) for layer l, M v DFT vectors (frequency domain (FD) DFT vector, FD basis vector, FD beam) indicate the selected frequency domain basis. Each DFT vector uses N3 FD bases (subbands). N3 is the total number (number of subbands) of precoding (beamforming) matrices (precoders) indicated by the PMI as a function of the number of subbands configured in the csi-ReportingBand. The csi-ReportingBand indicates contiguous or discontiguous subbands within a BWP when CSI for that BWP is reported. M v If N3 > 19, there are M FD DFT vectors from the intermediate subset (InS) of size N3' (<N3). v FD DFT vectors (FD basis) are selected. If N3≦19, log2(C(N3−1,M v -1)) bits are reported, where C(N3-1,M v -1) is N3-1 to M v -Represents the number of combinations in which one can be selected (combinatorial coefficient), and is also called the binomial coefficient.

[0218] The frequency domain response / distribution (frequency response) represented by the linear combination of the FD DFT vector and the LC coefficients may be called an FD beam, which may correspond to a delay profile (time response).

[0219] The PMI subband size is given by CQI subband size / R, where R∈{1, 2}. In other words, R is the ratio of the CQI subband size to the PMI subband size. The number of FD DFT vectors for a given rank v is M. v is ceil(p v ×N3 / R) The number of FD DFT vectors M vis the same for all layers l∈{1,2,3,4}. v is set by higher layers.

[0220] The multiple precoding matrix indicated by the PMI is L+M v is determined from vectors.

[0221] The L SD beams (SD DFT vectors) vm_1^(i), m_2^(i) for beam index i=0,1,...,L-1 are identified by q1, q2, n1, n2, and i 1,1 , i 1,2 is shown by

[0222] M v The FD DFT vectors are initial ∈{-2M v +1,-2M v +2,...,0}, n 3,l =[n 3,l (0) ,...,n 3,l (M_v-1) ], n 3,l (f) ∈{0,1,...,N3-1}.

[0223] In the FD DFT vector, the elements (FD basis) for the FD basis (subband) index t=0,1,...,N3-1 and layer l=1,...,v are y t,l (f) =exp(j2πtn 3,l (f) / N3). M of FD DFT vector v indices f=0,1,...,M v M to -1 v The FD DFT vectors are 0,l (f) ,y 1,l (f) ,...,y N_3-1,l (f) ] T is.

[0224] W 2,lEach row of represents the channel frequency response of a particular SD beam. If the SD beam has high directivity, the channel taps per beam are limited (the power delay profile is sparse in the time domain). As a result, the channel frequency response per SD beam is highly correlated (approaching flat in the frequency domain). In this case, the channel frequency response can be approximated by a linear combination of a small number of FD DFT vectors. For example, M v = 2, the FD DFT vector f2,f q and LC coefficient d1 0 ,d2 0 and the frequency response associated with the SD beam b0 is given by d1 0 f2+,d2 0 f q is approximated by

[0225] Dominant M v M FD DFT vectors are selected. v <<By setting it to N3, W ~ l The overhead of W 2,l The overhead is much smaller than that of M v All or some of the FD DFT vectors are used to approximate the frequency response of each SD beam. A bitmap is used to report only the selected FD DFT vectors for each SD beam. If no bitmap is reported, all FD DFT vectors are selected for each SD beam. In this case, the NZCs of all FD DFT vectors are reported for each SD beam. The number of NZCs in a layer, K l NZ ≦K0=ceil(β×2LM v ) and the NZC number K across all layers NZ ≦2K0=ceil(β×2LM v ) where β is set by higher layers.

[0226] In the extended type 2 codebook, L, β, p vThe combination of values ​​(parameter combination) is determined by the upper layer parameter paramCombination-r16 (parameter combination setting). L is the number of SD beams. v is the number of FD basis vectors for rank v, M v =ceil(p v × N3 / R). β is a parameter for calculating the maximum number of NZCs.

[0227] In the present disclosure, the terms codebook parameter combination, codebook parameter combination, parameter combination, and parameter combination setting may be read interchangeably.

[0228] Type 2 CSI feedback on PUSCH in Rel. 16 includes two parts. CSI Part 1 has a fixed payload size and is used to identify the number of information bits in CSI Part 2. The size of Part 2 is variable (the UCI size depends on the number of NZCs, which is unknown to the base station). The UE reports the number of NZCs in CSI Part 1, which determines the size of CSI Part 2. The base station knows the size of CSI Part 2 after receiving CSI Part 1.

[0229] In Rel. 16 Enhanced Type 2 CSI feedback, CSI Part 1 includes the RI (if reported), the CQI, and an indicator of the total number of non-zero amplitude coefficients across layers for Enhanced Type 2 CSI. The fields in Part 1, RI (if reported), CQI, and the indicator of the total number of non-zero amplitude coefficients across layers, are coded separately. CSI Part 2 includes the PMI for Enhanced Type 2 CSI. Parts 1 and 2 are coded separately. CSI Part 2 (PMI) includes the oversampling factor, the index of the SD basis corresponding to each SD beam, and the index M of the initial FD DFT vector (start offset) for the selected DFT window. initialand at least one of the selected FD basis for each layer, NZC (amplitude and phase) for each layer, strongest coefficient indicator (SCI) for each layer, and amplitude of the strongest coefficient for each layer / polarization.

[0230] The multiple PMI indices (PMI values, codebook indices) associated with different CSI part 2 information are expressed by the following equation F21 for the l-th layer of rank v: i1 = [i 1,1 i 1,2 i 1,5 i 1,6,1 i 1,7,1 i 1,8,1 ] (v=1) i1=[i 1,1 i 1,2 i 1,5 i 1,6,1 i 1,7,1 i 1,8,1 i 1,6,2 i 1,7,2 i 1,8,2 ] (v=2) i1=[i 1,1 i 1,2 i 1,5 i 1,6,1 i 1,7,1 i 1,8,1 i 1,6,2 i 1,7,2 i 1,8,2 i 1,6,3 i 1,7,3 i 1,8,3 ] (v=3) i1=[i 1,1 i 1,2 i 1,5 i 1,6,1 i 1,7,1 i 1,8,1 i 1,6,2 i 1,7,2 i 1,8,2 i 1,6,3 i 1,7,3 i 1,8,3 i 1,6,4 i 1,7,4 i 1,8,4 ] (v=4) (F21)

[0231] Each index is defined as follows: ◆i 1,1 : Rotation factors [q1 q2] in two-dimensional oversampling. q1∈{0,1,...,O1-1}, q2∈{0,1,...,O2-1}. A beam index is selected within each (SD) beam group, i 1,1 Reported / displayed by i 1,2 : Multiple indices of the SD basis corresponding to each SD beam. i 1,2 ∈{0,1,...,C(N1N2,L)-1}. L beam groups are selected from N1N2 (SD) beam groups, and i 1,2 Reported / displayed by i 1,5 : Codebook indicator. The index of the FD basis for the selected DFT window. i 1,5 ∈{0,1,...,2M v -1}. ◆i 1,6,l : Codebook indicator. The FD basis selected for the l-th layer. If N3≦19, then i 1,6,l ∈{0,1,...,C(N3-1,M v -1)-1}. If N3>19, i 1,6,l ∈{0,1,...,C(2M v -1,M v -1)-1}. ◆i 1,7,l : Bitmap indicator for the lth layer. The non-zero bits in the bitmap are i 2,4,l and i 2,5,l Identifies which coefficients in are reported. 1,7,l =[k l,0 (3) ...k l,M_v-1 (3) ], k l,f (3) =[k l,0,f (3) ...k l,M_v-1,f (3) ], k l,i,f (3) ∈{0,1}. ◆i 1,8,l : The strongest coefficient indicator for the lth layer (the largest element k in the amplitude coefficient indicator) l,i,f (2) ).i1,8,l The strongest coefficients in layer l, identified by ∈{0,1,...,2L-1}, are i for v=1. 1,8,l =Σ i=0 i_1^* k l,i,0 (3) -1, and for 1 < v ≤ 4, i 1,8,l =i l * It is given as follows. ◆i 2,3,l : Amplitude coefficient indicator (for both polarizations) of the (wideband) coefficients of the lth layer. 2,3,l =[k l,0 (1) k l,1 (1) ]. ◆i 2,4,l : The amplitude coefficient indicator of the reported (subband) coefficient of the lth layer. 2,4,l =[k l,0 (2) ...k l,M_v-1 (2) ]. ◆i 2,5,l : Phase coefficient indicator of the reported (subband) coefficient of the lth layer. 2,5,l =[c l,0,f ...c l,M_v-1,f ].

[0232] f l * ∈{0,1,...,M v -1}, i 2,4,l Let i be the index of l * ∈{0,1,...,2L-1} is k l,f_l^* (2) Let f be the index of l * and i l * is the strongest coefficient for layer l=1,...,v, i.e., for layer l 2,4,l Elements kl,i_l^*,f_l^* (2) Identify the codebook index n 3,l is n 3,l (f_l^*) Regarding 3,l (f) =(n 3,l (f)-n 3,l (f_l^*) ) mod N3 and remapped, and after remapping, n 3,l (f_l^*) = 0. The index f is f l * Regarding f=(ff l * ) mod M v and after remapping, l * = 0 (l = 1,...,v). 2,4,l , i 2,5,l , and i 1,7,l indicates the amplitude coefficient, phase coefficient, and bitmap after remapping, respectively.

[0233] W ~ l Each reported LC coefficient (complex coefficient) in is a separately quantized amplitude and phase. ◆ Amplitude quantization Polarization-specific reference amplitudes are calculated from the table (amplitude coefficient indicator i 2,3,l Mapping of elements in: Amplitude coefficient indicator element k l,p (1) to amplitude coefficient p l,p (1) This table uses 16-level quantization with a mapping to p l (1) =[p l,0 (1) p l,1 (1) ] is [k l,0 (1) k l,1 (1) ], k l,p (1) ∈{0,...,15}. All other coefficients are quantized according to the table defined in the specification (amplitude coefficient indicator i 2,4,l Mapping of elements in: Amplitude coefficient indicator element k l,i,f (2) to amplitude coefficient p l,i,f (2) This table uses 8-level quantization with a mapping to p l (2) =[p l,0 (2)...p l,M_v-1 (2) ], p l,f (2) =[p l,0,f (2) ...p l,2L-1.f (2) ] is k l,f (2) =[k l,0,f (2) ...k l,2L-1.f (2) ], k l,i,f (2) ∈{0,...,7}. ◆Phase quantization Amplitude coefficient indicator i 2,5,l Elements in (amplitude coefficient indicator elements) [c l,0 ...c l,M_v-1 ] is reported by the UE (using 4 bits). All phase coefficients are quantized using 16-PSK. The quantity φ for the phase difference l,i,f = exp(j2πc l,i,f / 16) is the phase coefficient c l,f =[c l,0,f ...c l,2L-1.f ], c l,i,fi ∈{0,...,15}.

[0234] The amplitude coefficient indicator element kl,floor(i_l^* / L) corresponds to the strongest coefficient of layer l. (1) = 15 (maximum value), and the amplitude coefficient indicator element k l,i_l^*,0 (2) = 7 (maximum value), and the phase coefficient indicator element c l,i_l^*,0 (2) = 0 (minimum value). For l=1,...,v, kl,floor(i_l^* / L) (1) , k l,i_l^*,0 (2) , c l,i_l^*,0 (2) =0 is not reported.

[0235] i 1,5 and i 1,6,l is the PMI index for FD-based reporting. Only if N3>19, i 1,5 is reported.

[0236] 3000 to 2999+P CSI-RS The precoding matrix W is represented by the codebook for v (=1 to 4) layer CSI reporting using (v) is the precoding matrix W for layer l (= 1 to v) l Based on the precoding matrix W l is expressed by the following formula F3.

[0237] where beam index i=0,1,...,L-1, m1 (i) =O1n1 (i) +q1, m2 (i) =O2n2 (i) +q2, n1 (i) ∈{0,1,...,N1-1}, n2 (i) n1 ∈{0,1,...,N2-1}. (i) , n2 (i) is the SD basis for representing the SD beam i. vm_1^(i),m_2^(i) are DFT vectors representing the SD beams. p l,0 (1) denotes the wideband amplitude coefficient. l,i,f (2) denotes the subband amplitude coefficient. l,i,f denotes a phase coefficient. Thus, the codebook for each layer includes the strongest coefficient for each polarization, the amplitude coefficient for each polarization, the FD beam, and the SD beam, and the phase coefficient for each polarization, the FD beam, and the SD beam.

[0238] For CSI Part 2 grouping, for a given CSI report, the PMI information is grouped into three groups (groups 0 to 2). This is important when CSI omission is performed. Index i 2,4,l , i 2,5,l , i 1,7,l Each reported element of is associated with a specific priority rule. Groups 0 to 2 follow the following: ◆ Group 0: Index i 1,1 , i 1,2 , i 1,8,l (l=1,...,v) ◆Group 1: Index i (if reported) 1,5, index i (if reported) 1,6,l , i 1,7,l The highest (top) v2LM v -floor(K NZ / 2) priority elements, i 2,3,l , i 2,4,l The highest (upper) ceil(K NZ / 2)-v priority elements, i 2,5,l The highest (upper) ceil(K NZ / 2)-v priority elements (l=1,...,v) ◆Group 2: i 1,7,l The lowest (lowest) floor(K NZ / 2) priority elements, i 2,4,l The lowest (lowest) floor(K NZ / 2) priority elements, i 2,5,l The lowest (lowest) floor(K NZ / 2) priority elements (l=1,...,v)

[0239] In Type-1 CSI, an SD beam represented by an SD DFT vector is sent to the UE. In Type-2 CSI, L SD beams are linearly combined and sent to the UE. Each SD beam can be associated with multiple FD DFT vectors (FD beam, FD basis, frequency response). For the corresponding SD beam, the channel frequency response can be obtained by linearly combining these FD DFT vectors. The channel frequency response corresponds to the power delay profile.

[0240] (Type 2 Port Selection Codebook) For Rel. 15 Type 2 port selection (PS) CSI (Type 2 PS Codebook), the UE is configured with the higher layer parameter codebookType set to 'typeII-PortSelection'.

[0241] In Rel. 15's Type 2 port selection CSI, the UE does not need to derive an SD beam by considering an SD DFT vector as in Type 2 CSI. The base station transmits CSI-RS using K CSI-RS ports beamformed by considering a set of SD beams. The UE selects / identifies the best L (≦K) CSI-RS ports for each polarization and reports their indices in W1. Rel. 15's Type 2 PS CSI supports ranks 1 and 2.

[0242] The value of d is set using the upper layer parameter portSelectionSamplingSize. d ∈ {1, 2, 3, 4} and d ≦ min(P CSI-RS / 2,L).

[0243] For each polarization, L antenna ports are 1,1 Selected by i 1,1 ∈{0,1,...,ceil(P CSI-RS / (2d))-1}.

[0244] ((Enhanced Type 2 Port Selection Codebook (Rel. 16))) For Rel. 16 Type 2 PS CSI (enhanced Type 2 PS codebook), the UE is configured with the upper layer parameter codebookType set to 'typeII-PortSelection-r16'.

[0245] The operation of Rel. 16 Type 2 PS CSI is similar to Rel. 16 Type 2 CSI except for SD beam selection. Rel. 15 Type 2 PS CSI supports ranks 1 to 4.

[0246] For layer l∈{1,2,3,4}, the precoding matrix W for generating a subband-wise (subband (SB)-wise) precoder is l is expressed by the following formula F4: l (N t ×N3) = QW1W ~ l W f,l H (F4)

[0247] Here, Q(N t ×K) denotes the K SD beams used for CSI-RS beamforming. W1(K×2L) is a block diagonal matrix. W ~ l (2L×M) is the LC coefficient matrix. W f,l (N3×M) is a matrix consisting of M vectors (FD basis vectors), and each vector contains N3 FD bases. K is set by the upper layer. L is set by the upper layer. P CSI-RS ∈{4,8,12,16,24,32}. P CSI-RS > 4, then L∈{2,3,4}.

[0248] In the Type 2PS CSI of Rel. 15 / 16, each CSI-RS port #i is connected to an SD beam b i is associated with.

[0249] The extended type 2 PS CSI increases the number of FD basis vectors from N3 to M in the same way as the type 2 CSI of Rel. 16. v By reducing it to (M v <<N3>>, which reduces overhead compared to Rel. 15 Type 2 PS CSI.

[0250] In the extended type 2 PS codebook, L, β, p v The combination of values ​​(parameter combination) is determined by the upper layer parameter paramCombination-r16 (parameter combination setting).

[0251] For the Rel. 17 Type 2 PS CSI / codebook (further enhanced Type 2 PS codebook), the UE configures the upper layer parameter codebookType set to 'typeII-PortSelection-r17'.

[0252] In Rel. 17 Type 2 PS CSI, each CSI-RS port #i transmits an SD-FD beam pair (SD beam b i and FD beam f i,j In this example, ports 3 and 4 are associated with the same SD beam and different FD beams.

[0253] The frequency selectivity of the channel frequency response observed at the UE based on an SD beam-FD beam pair can be reduced to less than the frequency selectivity of the channel frequency response observed at the UE based on an SD beam by delay pre-compensation.

[0254] The main scenario for the Rel. 17 Type-2 PS codebook is FDD. Channel reciprocity based on SRS measurements is not perfect (the angles of the UL beam and DL beam may be different, the UL frequency and DL frequency are different in FDD, and the effective antenna spacing at the UL frequency and DL frequency is different). However, the base station can obtain / select some partial information (dominant angle and delay (SD beam and FD beam)). By using SRS measurements at the base station in addition to CSI reports, the base station can obtain CSI for determining the DL MIMO precoder. In this case, some CSI reports may be omitted to reduce CSI overhead.

[0255] In the supplemental enhanced type 2 PS codebook, the values ​​of α, M, and β (codebook parameter combination, parameter combination) are determined by the upper layer parameter paramCombination-r17 (codebook parameter setting). In the parameter combination α, M, and β for the supplemental enhanced type 2 PS codebook in Rel. 17, α is the number of selected CSI-RS ports in the PS codebook, K1 = αP CSI-RSis a parameter for the calculation of M. M is the number of FD basis vectors. β is a parameter for the calculation of the maximum number of NZCs. The precoding matrix indicated by PMI is determined from L+M vectors, where L=K1 / 2 and K1=αP CSI-RS is.

[0256] L vectors v m^(i) (i=0,1,...,L-1) based on P CSI-RS K1 ports are selected from the vector v m^(i) is m=[m (0) ... [m (L-1) ], m (i) ∈{0,1,...,P CSI-RS / 2-1}. (i) is the index i 1,2 ∈{0,1,...,C(P CSI-RS / 2,L)-1}.

[0257] In the additional enhanced Type 2PS CSI of Rel. 17, each CSI-RS port is beamformed using an SD beam and an FD beam, and each port is associated with an SD-FD beam pair.

[0258] Precoding matrix W for a given layer l l is expressed by the following formula F5: l (K×N3) = W1W ~ l W f,l H (F5)

[0259] For W1(K×2L), each matrix block consists of L columns of a K×K identity matrix. The base station transmits K beamformed CSI-RS ports. Each port is associated with an SD-FD beam pair. The UE selects L ports out of the K and reports the index of the selected port to the base station as part of the PMI. Note that in Rel. 16, each port is associated with an SD beam.

[0260] W~ l (2L×M v ) is a matrix of combining coefficients (subband complex LC coefficients). Up to K0 NZCs are reported. The report consists of two parts: a bitmap indicating the NZC positions and the quantized NZCs.

[0261] In the additional extension type 2PS CSI of Rel. 17, K l NZ =Σ i=0 k1-1 Σ f=0 M-1 k l,i,f (3) ≦K0 is the number of non-zero coefficients in layers l=1,...,v, and K NZ =Σ l=1 v K l NZ ≦2K0 is the total number of non-zero coefficients. If v≦2 and K NZ =K1Mv, i for layers l=1,...,v 1,7,l (Bitmap indicator for the lth layer) is not reported. That is, if the total number of reported NZCs is equal to the maximum number of K1Mv and v≦2, reporting of the bitmap indicating the positions of NZCs is omitted. Note that in Rel. 16, the NZC position bitmap is always reported.

[0262] W f,l (N3×M v ) is M for each layer. v (M v = 1 or 2) FD basis vectors. Each vector contains N3 FD bases (FD-DFT bases). The base station f,l You can also erase. M v If W = 1, f,l is off and no additional FD basis vectors are reported. v If W = 2, f,l is on and M v additional FD basis vectors are reported. v= 2, the window size N ∈ {2, 4} of the FD basis is set by the upper layer parameter (valueOfN). f,l is always reported.

[0263] (JT) Joint transmission (JT) may refer to simultaneous data transmission from multiple points (eg, TRPs) to a single UE.

[0264] Rel. 17 supports non-coherent joint transmission (NCJT) from two TRPs. The PDSCHs from the two TRPs may be independently precoded and independently decoded. The frequency resources may be non-overlapping, partially overlapping, or fully overlapping. When overlap occurs, the PDSCH from one TRP will interfere with the PDSCH from the other TRP.

[0265] Rel. 18 is considering supporting coherent joint transmission (CJT, mTRP CJT) using up to four TRPs. Data from the four TRPs may be coherently precoded and transmitted to the UE on the same time-frequency resource. For example, the same precoding matrix may be used to consider channels from the four TRPs. "Coherent" may mean that there is a fixed relationship between the phases of multiple received signals. Using four-TRP joint precoding, signal quality may be improved and there may be no interference between the four TRPs. Data may only be subject to interference outside the four TRPs.

[0266] (NCJT CSI / Type 1 Codebook) In Rel. 17, the applicable scenario for NCJT CSI reporting is a single DCI-based MTRP NCJT with a Type 1 single-panel codebook. For NCJT CSI measurement, two channel measurement resource (CMR) groups, each with a CMR from one TRP, can be configured within a single CSI-ReportConfig. One CSI reporting mode can be configured from two modes:

[0267] Through RRC signaling, the CSI-ReportConfig for Rel. 17 non-coherent joint transmission (NCJT) CSI configures the CMR and the CSI reporting mode (csi-ReportMode).

[0268] K s Two CMR groups with K = K1 + K2 CMRs are configured in the UE. s ≦8. K s The CMRs correspond to NZP-CSI-RS resource sets for channel measurement. K1 and K2 are the numbers of CMRs in the two CMR groups, respectively. N (N sets) CMR pairs (resource pairs) are configured by higher layers by selecting from all possible pairs. N=1, K s =2 is supported. max Support for K = 2 is an optional feature for the UE. S,max =X support is an optional feature for the UE. Each CMR can contain up to 32 CSI-RS ports, depending on the UE capabilities. Each CMR pair is associated with one CRI value.

[0269] The bitmap signaled by RRC indicates N (N=1, 2) CMR pairs actually used for NCJT measurement by indicating one CMR from each CMR group. The UE measures single-TRP CSI for TRP1 and single-TRP CSI for TRP2 using CMRs in the two CMR groups, and measures NCJT CSI using N CMR pairs.

[0270] The UE selects one or more CSIs to report based on the mode (CSI reporting mode) configured by csi-ReportMode. csi-ReportMode indicates one of the following two modes (NCJT CSI modes): Mode 1 and Mode 2. ◆ Mode 1 The UE may be configured to report X CSIs associated with single-TRP measurement hypotheses and one CSI associated with the NCJT measurement hypothesis. X = 0, 1, 2. If X = 2, two CSIs are associated with two different single-TRP measurement hypotheses with multiple CMRs from different CMR groups. Support for X = 1, 2 is an optional UE feature for UEs that support Option 1. ◆ Mode 2 The UE is configured to report one CSI associated with the best one of the NCJT and single-TRP measurement hypotheses.

[0271] In Mode 1, the UE reports a total of X+1 CSIs, including X (X=0, 1, 2) single-TRP CSIs and one NCJT CSI. In Mode 2, the UE reports one best CSI (one CSI) from all single-TRP CSIs and one NCJT CSI.

[0272] Within one CSI report, up to two single-TRP CSIs and one NCJT CSI can be reported (mode 1 with X=2). The NCJT CSI includes one CRI, two RIs (with one joint RI index), two PMIs, two LIs, and one CQI (up to four layers). The single-TRP CSI is the same as the existing CSI, and includes one CRI, one RI / PMI / LI, and one or two CQIs (up to eight layers, one CQI per CW).

[0273] New mapping orders (tables) of multiple fields within one CSI report are defined for some of the following cases: ◆ Wideband CSI mapping order for mode 1 with X=0. Wideband CSI is supported only for mode 1 with X=0, i.e., NCJT CSI. ◆ CSI Part 1 mapping order for modes 1 and 2. ◆ CSI Part 2 wideband mapping order for modes 1 and 2. ◆ CSI Part 2 subband mapping order for modes 1 and 2.

[0274] (CJT CSI / Type-2 Codebook) In the ideal case (where four TRPs are co-located), a joint estimation of the aggregated channel matrix H can be performed, and a joint precoding matrix V can be fed back. However, the large-scale path losses of the four paths can vary significantly. A joint precoding matrix V based on a constant module codebook is not accurate. In this case, the feedback per TRP and inter-TRP coefficients can be matched by the current NR Type-2 codebook.

[0275] For a CJT of up to four TRPs in FR1, the selection of the four TRPs may be semi-static. Therefore, the selection and configuration of the four CMRs (four CSI-RS resources) for channel measurement may also be semi-static. Dynamic indication of the four TRPs from a list of CSI-RS resources is also possible, but unlikely.

[0276] The path losses from the four TRPs to the UE are different, which makes it difficult to simply report one aggregated CSI that represents the joint channel matrix.

[0277] Considering fallback operation to NCJT (i.e., single TRP), CSI per TRP (i.e., single TRP CSI like NCJT CSI in Rel. 17) is also considered.

[0278] Assuming an ideal backhaul, synchronization, and the same number of antenna ports across multiple TRPs, CSI acquisition for coherent joint transmission (CJT) for FR1 and up to four TRPs is considered. For CJT multi-TRP for FDD, an extended (Rel. 16) Type 2 codebook and an additional extended (Rel. 17) Type 2 PS codebook are considered.

[0279] W1 (matrix representing SD DFT vector) / W for each TRP f (the matrix representing the FD DFT vector) may be the same or different. l (NZC) may be different. W1 / W for each TRP f / W l may be selected jointly or individually. W1 / W f / W l Different scenarios with different options are preferable for the design of W. φ may be reported as separate items or lThese used policies relate to deployment scenarios (e.g., intra-site multi-TRP or inter-site multi-TRP).

[0280] For example, the precoding matrix for a 4-TRP CJT CSI (codebook) is W1 / W f / W l The W1 for each TRP may be the same or different, selected jointly or individually. l may be different and may be selected jointly or individually. f may be the same or different, and may be jointly or individually selected.

[0281] There are two codebook mode settings for FD basis selection. In mode 1, we denote the FD basis offset for the j-th selected CSI-RS resource for j=2,...,N by i 1,9 In Mode 2, i 1,9 No reporting is required. All CSI-RS resources have the same FD basis selection.

[0282] ◆Mode 1 is SD / FD basis selection per TRP / TRP group. It allows independent FD basis selection across N TRPs / TRP groups. For example, its codebook structure is given by the following formula G1, where N is the number of TRPs or TRP groups.

[0283] ◆ Mode 2 is SD basis selection per TRP / TRP group (port group or resource) and joint / common FD basis selection (across N TRPs / TRP groups). For example, its codebook structure is given by the following formula G2, where N is the number of TRPs or TRP groups.

[0284] In these two modes, detailed designs such as parameter combination, basis selection, TRP (group) selection, reference amplitude, and W2 quantization method may be shared.

[0285] For an enhanced Type II codebook for CJT (Type 2 CSI for CJT in Rel. 18), the UE may configure the higher layer parameter codebookType set to 'typeII-CJT-r18'. For a further enhanced Type II port selection codebook for CJT (Type 2 PS CSI for CJT in Rel. 18), the UE may configure the higher layer parameter codebookType set to 'typeII-CJT-PortSelection-r18'.

[0286] The UE uses N TRP ∈{1,2,3,4} CSI-RS resources can be configured.

[0287] In the extended type 2 codebook for CJT, the upper layer parameter paramCombination-CJT-L-r18 determines {L1,...,L N_TRP} value of N L A set of ∈{1,2,4} combinations is set. N L The value of is set by the higher layer parameter numberOfSDCombinations.

[0288] In the CJT additional extended type 2 PS codebook, the upper layer parameter paramCombination-CJT-PS-alpha-r18 determines {α1,...,α N_TRP} value of N L A set of ∈{1,2,4} combinations is set. N L The value of is set by the higher layer parameter numberOfSDCombinations-PS.

[0289] The UE may configure the upper layer parameter restrictedCMR-Selection. If restrictedCMR-Selection is configured, the number of selected CSI-RS resources N is N TRP Otherwise, the UE TRP , we expect to select N CSI-RS resources, and the selection is TRP The value is reported using a bitmap of bits.

[0290] In selecting / reporting an SD beam, selection / reporting of an SD beam per CSI-RS resource is applied.

[0291] In the extended type 2 codebook for CJT, the precoding matrix indicated by PMI is Σ j=1 N L σ_j +M v vectors, where {σ1,...,σ N} is 1≦σ1<…<σ N ≦N TRP are the indices of the N CSI-RS resources selected in ascending order so that TRP may be the number of CSI-RS resources configured for CSI reporting, or may be the number of TRPs for CJT. σ_1 ,...,L σ_N} is {L1,...,L N_TRP} is the corresponding value from the selected combination.

[0292] j=1,...,N, i=0,1,...,L σ_j −1, L corresponding to the j-th selected CSI-RS resource σ_j The vectors vm_1,f^(i),m_2,f^(i) are 1,1 , i 1,2 It is displayed / reported by, where i 1,1 , i 1,2 is given by the following equation G3: 1,1 =[i 1,1,1 ...i 1,1,N ] i 1,1,j =[q 1,jq 2,j ] q 1,j ∈{0,1,...,O1-1} q 2,j ∈{0,1,...,O2-1} i 1,2 =[i 1,2,1 ...i 1,2,N ] i 1,2,j ∈{0,1,...,C(N1N2,L σ_j )-1} (G3)

[0293] In the additional extended type 2PS codebook for CJT, the precoding matrix indicated by PMI is Σ j=1 N L σ_j +M vectors, where {σ1,...,σ N} is 1≦σ1<…<σ N ≦N TRP are the indices of the N CSI-RS resources selected in ascending order so that L σ_j =K 1,σ_j / 2, K 1,σ_j =α σ_j *P CSI-RS {α σ_1 ,...,α σ_N} is {α1,...,α N_TRP} is the corresponding value from the selected combination.

[0294] j=1,...,N, i=0,1,...,L σ_j -1, L σ_j vectors v m_j^(i) Based on this, P of the j-th selected CSI-RS resource is CSI-RS From the ports, K 1,σ_j ports are selected and i 1,2 It is displayed / reported by, where i 1,2 is given by the following equation G4: 1,2 =[i 1,2,1 ...i 1,2,N ] i 1,2,j ∈{0,1,...,C(P CSI-RS ,L σ_j )-1} (G4)

[0295] In the present disclosure, the terms "codebook for CJT," "type 2 codebook for CJT," "extended type 2 codebook for CJT," "type 2 codebook for Rel. 18 CJT," "type II-CJT-r18," "additional extended type 2 PS codebook for CJT," "type 2 PS codebook for Rel. 18 CJT," "type II-CJT-PortSelection-r18'," "CJT CSI," and "CJT CSI report" may be read interchangeably.

[0296] (Doppler CSI / Type-2 Codebook) It is being considered to extend / improve CSI reporting for UEs moving at high / medium speeds by utilizing time-domain correlation / Doppler-domain (DD) information. For example, it is being considered to improve the extended (Rel. 16) Type-2 codebook and the additional extended (Rel. 17) Type-2 PS codebook without changing the spatial and frequency domain basis, and to report from the UE the time-domain channel characteristics (time-domain correlation profile) measured via the tracking CSI-RS (TRS).

[0297] The channel coherent time (CCT) depends on the maximum Doppler shift. The channel coherent time is the time during which the measured channel characteristics are available or until the measured channel characteristics become unavailable (channel aging). The maximum Doppler shift is estimated by the relative velocity between the transmitter and receiver. The channel coherent time T c is 1 / Δf max where Δf max = v / λ. As the UE's moving speed increases, the channel coherence time decreases. For example, at a carrier frequency of 4.5 GHz, when the moving speed exceeds approximately 25 km / h, the channel coherence time decreases to less than 10 ms. The problem is how to deal with such high moving speeds and short channel coherence times.

[0298] TRS is supported to track Doppler shift. However, TRS has the following problems: ◆ The number of ports per CSI-RS resource set is limited to one. Each CSI-RS resource uses a single port. ◆ The configurable period is 10 ms or more. ◆ CSI reporting for TRS is not assumed. There is no reporting configuration for P-TRS. Reporting can be configured, but the report quantity (reportQuantity) can only be set to 'none'. A maximum of 16 CSI-RS resources can be used per CSI-RS resource set.

[0299] The TRS is allocated to resources in the time domain and frequency domain. To measure the effect of Doppler shift, multiple RSs in the time domain are required within a specific frequency domain resource.

[0300] The CMR can be used to measure the effect of Doppler shift, but the RS used for the measurement depends on the UE implementation.

[0301] The amount of CSI reporting does not support information about Doppler shift. Through the CSI codebook (PMI), the UE reports information for determining W = W1W2, where W1 is the wideband characteristic and indicates the spatial beam, and W2 is the subband characteristic and indicates the amplitude / phase coefficient for each spatial beam.

[0302] Regarding measurements related to Doppler shift, there are possible cases: Case 1 in which the UE performs measurements based on CSI-RS, and Case 2 in which the base station performs measurements based on SRS. Regarding determination of the influence of Doppler shift, there are possible cases: Case 1-1 in which the UE performs determination based on CSI-RS measurement results, Case 1-2 in which the base station performs determination based on CSI-RS measurement results reported by the UE, and Case 2-1 in which the base station performs determination based on SRS measurement results.

[0303] A CSI-RS measurement window and a CSI reporting window are considered. Within a CSI-RS measurement window, one or more CSI-RS occasions may be measured. The reported CSI may be associated with a CSI reporting window.

[0304] Assuming that the CSI is reported in slot n, the length of the basis vectors (DFT basis vectors) in the Doppler domain (DD) / time domain (TD) (the number of DD / TD bases) may be N4. meas Within a CSI measurement window of W −1, one or more CSI occasions for calculation of a CSI report may be measured, where k may be a slot index and W meas may be the measurement window length (number of slots). The CSI occasion may be configured in the CSI-ReportConfig. Slot [l,l+W CSI −1] may be associated with a CSI report in slot n, where l may be a slot index and W CSI may be the reporting window length (number of slots). ref It may also be expressed as:

[0305] CSI reporting window duration W CSI = dN4, where d and N4 are determined by the CMR setting. The start of the CSI reporting window is slot l. l = (nN CSI,ref ) may be used. l=(n+δ) may be used. δ={0,2} may be used, or δ={0,1,2} may be used.

[0306] A d-slot may be of duration in DD units.

[0307] When UE-side prediction is assumed, the UE is supported to predict the CSI / channel after slot l, and the position of slot l (from multiple candidate values) is configured by the base station via higher layer signaling. The multiple candidates for the slot l position are determined based on the existing CSI reference resource position (nNCSI,ref ) and (n+δ), where δ>0. The existing CSI reference resource in the existing operation, i.e., (nN CSI,ref ) is reused / repurposed to indicate the position of the last CSI-RS occasion used for CSI reporting.

[0308] For the parameter δ, an additional value of 2 is supported.

[0309] N4 is configured by the base station via higher layer signaling.

[0310] When N4=1, the DD basis may be the identity. There may be no DD compression. In this case, the codebook structure may be, for example, the following formula H1:

[0311] For N4>1, the Doppler domain orthogonal DFT basis may be commonly selected for all SD / FD basis sets. In this case, the codebook structure may be, for example, the following formula H2:

[0312] Only Q>1, which indicates the number of selected Doppler domain (DD) basis vectors, is allowed. The detailed design of the SD / FD basis with associated UCI parameters follows existing specifications.

[0313] For an enhanced Type II codebook for predicted PMI (Rel. 18 Type 2 CSI for predicted PMI), the UE may configure the higher layer parameter codebookType set to 'typeII-Doppler-r18'. For a further enhanced Type II port selection codebook for predicted PMI (Rel. 18 Type 2 PS CSI for predicted PMI), the UE may configure the higher layer parameter codebookType set to 'typeII-Doppler-PortSelection-r18'.

[0314] In the present disclosure, the Doppler codebook, the Doppler type 2 codebook, the extended type 2 codebook for predicted PMI, the Rel. 18 type 2 CSI codebook for predicted PMI, type II-Doppler-r18, the additional extended type 2 PS codebook for predicted PMI, the Rel. 18 type 2 PS codebook for predicted PMI, and type II-Doppler-PortSelection-r18 may be interpreted as interchangeable.

[0315] (TDCP Reporting) Reporting of time domain channel properties (TDCP) from the UE is under consideration.

[0316] In TDCP, the amplitude and phase difference / correlation of tracking CSI-RS (TRS) transmitted at multiple times are reported. For example, resource configuration for TDCP reporting that reuses at least a part of the conventional TRS resource configuration is under consideration. Also, 'tdcp' may be introduced as a new report quantity (ReportQuantity). For TDCP, ＴＲＳ TRS resource sets may be configured.

[0317] The report quantity (upper layer parameter reportQuantity) is set to 'tdcp', the upper layer parameter Y ≥ 1, and the delays {D1,...,D Y}, and for the CSI-ReportConfig with TDCP =[k1 ... k Y ] is reported, where k i ∈{0,...,15}. For i=1,...,Y, the corresponding amplitude value is 1-a i It is obtained from k i From a i The mapping to is defined in the specification.

[0318] For Y>1, if the upper layer parameter phase is set, the TDCP phase c TDCP =[c1 ... c Y ] is reported, where ci ∈{0,...,15}. The corresponding phase value is exp(j2πc i / 16).

[0319] For TDCP reporting, the following limitations on the existing TRS (periodic / aperiodic) may be applied for source RS: Number of TRS resource sets per configuration (can be 1-3 and can be determined according to UE capabilities); Number of TRS resources per set (same as existing, i.e., a total of 4 resources across 2 consecutive slots in FR1).

[0320] In a TDCP report, the reported metrics may include amplitude and phase.

[0321] The amplitude size Q (quantization alphabet) is expressed as {1-2-(2^Qq)1 / 2}, where q=0,1,...,2 Q The phase is -1. The phase is uniform quantization of 16-PSK.

[0322] Operation in the time domain applies to aperiodic reporting only (UCI on PUSCH).

[0323] Number of occupied CPUs (O CPU ) is (Y+1)X, where X can be 1, 2, or determined according to the UE capabilities.

[0324] For the CSI calculation time, the existing values ​​(Z2, Z'2) may be reused.

[0325] For counting active resources, existing rules may be reused.

[0326] In TRS for inter-cell multi-TRP, the QCL source of P (periodic)-TRS corresponds to an SS / PBCH block with a PCI different from that of the serving cell.

[0327] For example, for a periodic CSI-RS resource of the NZP-CSI-RS-ResourceSet configured in the higher layer parameter trs-Info, the UE expects the TCI state to indicate a specific QCL type (e.g., type C / D).

[0328] (CSI Processing Criteria: Physical Layer Procedure for Data / Physical Downlink Shared Channel Related Procedure / UE Procedure for Reporting CSI / CSI Framework) The UE uses the following capability information to determine the number of supported simultaneous CSI calculations (maximum number of simultaneous CSI calculations) N CPU Report / display N CPUindicates the number of CSI processing units (CPUs). - simultaneousCSI-ReportsPerCC in csi-ReportFramework in MIMO-ParametersPerBand. MIMO-ParametersPerBand is used to convey MIMO-related parameters specific to a certain band. csi-ReportFramework indicates whether the UE supports the CSI reporting framework. simultaneousCSI-ReportsPerCC indicates the number of CSI reports that the UE can simultaneously measure and process reference signals within one CC of a band where this capability is provided. CSI reports include periodic, semi-persistent, and aperiodic CSI, and any latency class and codebook type. CSI reports in simultaneousCSI-ReportsPerCC include beam reports and CSI reports. - simultaneousCSI-ReportsAllCC in CA-ParametersNR. simultaneousCSI-ReportsAllCC indicates whether the UE supports the CSI reporting framework and the number of CSI reports the UE can process simultaneously across all CCs (master cell group (MCG) and secondary cell group (SCG) in the case of NR-DC). CSI reports include periodic, semi-persistent, and aperiodic CSI, and any latency class and codebook type. CSI reports in simultaneousCSI-ReportsAllCC include beam reports and CSI reports. This parameter is further limited by simultaneousCSI-ReportsPerCC and Phy-ParametersFRX-Diff in MIMO-ParametersPerBand for each band in a given band combination.

[0329] UE is N CPU If the UE supports N simultaneous CSI calculations, the UE uses N CPUIf L CPUs are dedicated to the calculation of CSI reports in a given OFDM symbol, the UE is said to have N CPU -L free CPUs. N CPU On the same OFDM symbol where L CPUs are not occupied, N CSI reports start by occupying their respective CPUs, and O of each CSI report n=0,...,N-1 of the N CSI reports CPU (n) (the number of CPUs consumed for CSI report n), the UE selects the lowest priority (the highest priority value Pri iCSI (y, k, c, s)), where 0≦M≦N, is not required to update (calculate, process) the NM requested CSI reports from Σ n=0 M-1 O CPU (n) ≦N CPU -L is the maximum value for which it holds.

[0330] The UE is CPU It is not assumed that the A-CSI trigger state will be configured with more than one report setting. The processing of the CSI report will occupy some CPUs in some symbols, such as the following processes 1, 2, a, and 3. The processing of the CSI report may occupy 0, 1, or more CPUs (O CPU , number of CPUs consumed) (CPU occupancy rule).

[0331] - Procedure 1: In the case where CSI reporting is configured with CSI-ReportConfig with higher layer parameter reportQuantity set to 'none' and CSI-RS-ResourceSet with higher layer parameter trs-Info, CPU =0.

[0332] - Operation 2 (Beam Management) In a CSI report with CSI-ReportConfig with higher layer parameter reportQuantity set to 'cri-RSRP', 'ssb-Index-RSRP', 'cri-SINR', 'ssb-Index-SINR', 'cri-RSRP-Capability[Set]Index', 'ssb-Index-RSRP-Capability[Set]Index', 'cri-SINR-Capability[Set]Index', 'ssb-Index-SINR-Capability[Set]Index', or 'none' (if CSI-RS-ResourceSet with higher layer parameter trs-Info is not configured), O CPU =1.

[0333] - Process a (TDCP Reporting) For CSI reporting using CSI-ReportConfig with higher layer parameter reportQuantity set to 'tdcp' and the number of delays Y set by higher layer parameter Y, CPU = (Y+1), where the value of X >= 1 is reported by the UE capability.

[0334] - Procedure 3: In a CSI report with CSI-ReportConfig with higher layer parameter reportQuantity set to 'cri-RI-PMI-CQI', 'cri-RI-i1', 'cri-RI-i1-CQI', 'cri-RI-CQI', or 'cri-RI-LI-PMI-CQI', CPU follows the following process 3-x: -- Process 3-1 (case where the UE can use the maximum of the UE capability) max{μ PDCCH , μ CSI-RS , μ UL}≦3 and CSI reporting without PUSCH transmission with at least one of transport block and HARQ-ACK is triggered aperiodically when L=0 CPUs are occupied, the CSI corresponds to a single CSI with wideband frequency-granularity and 4 or less CSI-RS ports in a single resource without CRI reporting, the codebookType is set to 'typeI-SinglePanel' and the reportQuantity is set to 'cri-RI-CQI', CPU =N CPU μ PDCCH μ is the subcarrier spacing (SCS) setting of the PDCCH. CSI-RS is the SCS setting of the CSI-RS. μ UL is the SCS configuration of the UL BWP where the CSI report is transmitted. -- Procedure 3-2 (NCJT CSI case) If a CSI-ReportConfig with codebookType set to 'typeI-SinglePanel' is configured and the corresponding CSI-RS resource set for channel measurement is configured with two resource groups and N resource pairs, then O CPU = X·N+M, where X is the number of CPUs occupied by a pair of CMRs according to the UE capability. The UE capability mTRP-CSI-numCPU-r17 indicates the number of CPUs occupied by a pair of CMRs for the NCJT CSI hypotheses. K SNZP for channel measurement with K1 resources = K1 + K2 resources For M1 resources and M2 resources associated with CRI values ​​for resource group 1 with K1 resources and resource group 2 with K2 resources in the CSI-RS resource set, M = M1 + M2. -- Process 3-3 (CJT CSI case) A CSI-ReportConfig is configured with the upper layer parameters reportQuantity set to 'cri-RI-PMI-CQI' and codebookType set to 'typeII-CJT-r18' or 'typeII-CJT-PortSelection-r18', and the corresponding 1 < N TRP If an NZP-CSI-RS-ResourceSet for channel measurement with ≤ 4 resources is configured, O CPU =X・N TRP where the value of X≧1 is reported by the UE capability. -- Procedure 3-4 (Doppler CSI case) If CSI-ReportConfig is configured with the higher layer parameter reportQuantity set to 'cri-RI-PMI-CQI' and the codebookType set to 'typeII-Doppler-r18' or 'typeII-Doppler-PortSelection-r18', then O CPU The following procedure is followed: Procedure 3-4-1: If the corresponding CSI-RS resource set for channel measurement is aperiodic and configured with K CSI-RS resources, then CPU = Y1·K, where Y1≧1 is reported by the UE capability. --- Step 3-4-2 If the corresponding CSI-RS resource set for channel measurement is periodic or semi-persistent and configured with a single CSI-RS resource, then for N4=1, O CPU = 4, and for N4 > 1, O CPU= Y2·N4 ≥ 4, where N4 is set by the higher layer parameter N4 and Y2 ≥ 1 is reported by the UE capability. -- Procedure 3-5 Otherwise, O CPU =K S It is. K S is the number of CSI-RS resources in the CSI-RS resource set for channel measurement.

[0335] For a CSI report with CSI-ReportConfig with the higher layer parameter reportQuantity not set to 'none', one or more CPUs are occupied for the following OFDM symbols (CPU occupation duration): A P-CSI or SP-CSI report occupies one or more CPUs from the first symbol of the earliest one of the CSI-RS / CSI-IM / SSB resources for channel or interference measurement, where the last CSI-RS / CSI-IM / SSB occasion precedes the corresponding CSI reference resource, to the last symbol of the PUSCH / PUCCH configured to carry the report (CPU occupation duration 1). The P-CSI or SP-CSI report excludes the first SP-CSI report on the PUSCH after the PDCCH that triggers the report. The time during which the P-CSI report or SP-CSI report occupies one or more CPUs may be referred to as CPU occupation duration 1. - An A-CSI report occupies one or more CPUs from the first symbol after the PDCCH that triggers the CSI report to the last symbol of the configured PUSCH / PUCCH that carries the report (CPU occupation duration 2). If the PDCCH reception includes two corresponding PDCCH candidates from two search space sets, the PDCCH candidate that ends later is used to determine the CPU occupation duration. The time during which the A-CSI report occupies one or more CPUs may be referred to as CPU occupation duration 2. - The first SP-CSI report on the PUSCH after the PDCCH trigger occupies one or more CPUs from the first symbol after the PDCCH to the last symbol of the scheduled PUSCH that carries the report (CPU occupation duration 3). If the PDCCH reception includes two corresponding PDCCH candidates from two search space sets, the PDCCH candidate that ends later is used to determine the CPU occupation duration. The time during which the SP-CSI report occupies one or more CPUs may be referred to as CPU occupation duration 3.

[0336] In any slot, the UE is not expected to have more active CSI-RS ports or active CSI-RS resources in the active BWP than the number reported as its capabilities. NZP CSI-RS resources are active for a duration defined as follows: - The duration for A-CSI-RS starts from the end of the PDCCH containing the request and ends at the end of the scheduled PUSCH containing the report associated with that A-CSI-RS. - The duration for SP-CSI-RS starts from the end of the time when the activation command applies and ends at the end of the time when the deactivation command applies. - The duration for P-CSI-RS starts when the P-CSI-RS is configured by higher layer signaling and ends when the P-CSI-RS configuration is released.

[0337] If a CSI-RS resource is referenced by N CSI reporting settings, then that CSI-RS resource and the CSI-RS ports within that CSI-RS resource are counted N times.

[0338] A P-CSI-RS is always counted as an active CSI-RS regardless of whether it is received on that OFDM symbol or not.

[0339] The UE reports UE capability information (codebookParameter) related to the codebook of the CSI report for each band.

[0340] The codebookParameter indicates the codebook (type) and corresponding parameters supported by the UE. Reporting of parameters corresponding to Type 1 single panel is mandatory. Reporting of parameters corresponding to Type 1 multi-panel, Type 2, and Type 2 port selection is optional. The parameters may include at least one of maxNumberTxPortsPerResource, maxNumberResourcesPerBand, and totalNumberTxPortsPerBand. maxNumberTxPortsPerResource indicates the maximum number of transmit ports in one resource. maxNumberResourcesPerBand indicates the maximum number of resources that can be used simultaneously across all CCs in one band. totalNumberTxPortsPerBand indicates the maximum number of transmit ports that can be used simultaneously across all CCs in one band.

[0341] In this disclosure, CPU occupation, number of occupied CPUs, number of CPUs, O CPU , and the number of CPUs consumed may be read interchangeably.

[0342] (CSI Reporting Conditions) After CSI reporting (re)configuration, serving cell activation, BWP change, or SP-CSI activation, the UE reports a CSI report only after receiving at least one CSI-RS transmission occasion for channel measurement and a CSI-RS / CSI-IM occasion for interference measurement when the CSI reference resource is not later than the CSI reference resource. Otherwise, the UE drops the report.

[0343] For a CSI reporting configuration (CSI-ReportConfig) that includes a list of sub-configurations provided by csi-ReportSubConfigList, after a CSI reporting (re)configuration, serving cell activation, BWP change, or SP-CSI activation, the UE reports a CSI report including one or more sub-reports only after receiving at least one CSI-RS transmission occasion for channel measurement and a CSI-RS / CSI-IM occasion for interference measurement for each sub-configuration when the CSI reference resource is not later than the CSI reference resource. Otherwise, the UE drops the report. Here, the sub-configuration is the sub-configuration activated / triggered for SP-CSI reporting.

[0344] For a CSI-ReportConfig configured with two resource groups and N resource pairs for channel measurement in the corresponding CSI-RS resource set, after a CSI reporting (re)configuration, serving cell activation, BWP change, or SP-CSI activation, the UE reports a CSI report only if the UE has received at least one CSI-RS transmission occasion for each of the CSI-RS resources in the corresponding CSI-RS resource set for channel measurement not later than the CSI reference resource and within the same DRX active time if DRX is configured. Otherwise, the UE drops the report.

[0345] For a CSI-ReportConfig configured with codebookType set to 'typeII-CJT-r18' or 'typeII-CJT-PortSelection-r18', after a CSI reporting (re)configuration, serving cell activation, BWP change, or SP-CSI activation, the UE reports a CSI report only after receiving at least one CSI-RS transmission occasion for each of the CSI-RS resources in the corresponding CSI-RS resource set for channel measurement and one CSI-RS / CSI-IM occasion for the CSI-RS / CSI-IM resources in the corresponding resource set for interference measurement, not later than the CSI reference resource and within the same DRX active time if DRX is configured. Otherwise, the UE drops the report.

[0346] For a CSI-ReportConfig configured with codebookType set to 'typeII-Doppler-r18' or 'typeII-Doppler-PortSelection-r18', after a CSI reporting (re)configuration, serving cell activation, BWP change, or SP-CSI activation, the UE transmits at least one aperiodic CSI-RS transmission occasion for each of multiple CSI-RS resources in the corresponding CSI-RS resource set for channel measurement when the UE is not later than the CSI reference resource and within the same DRX active time if DRX is configured, or p The UE reports a CSI report only if it receives K periodic or semi-persistent consecutive multiple CSI-RS transmission occasions and one CSI-RS / CSI-IM occasion for the CSI-RS / CSI-IM resources in the corresponding resource set for interference measurement. Otherwise, the UE drops the report. p The values ​​∈{1,2,4} are indicated by the UE capabilities.

[0347] For a CSI-ReportConfig configured with the higher layer parameter reportQuantity set to 'tdcp', after a CSI reporting (re)configuration, serving cell activation, BWP change, or SP-CSI activation, the UE shall determine the K of the corresponding CSI-RS resource settings for channel measurement when the UE is not behind the CSI reference resource and within the same DRX active time if DRX is configured. TRS The UE reports a CSI report only if it has received at least one CSI-RS transmission occasion for each CSI-RS resource in the CSI-RS resource set, otherwise it drops the report.

[0348] If DRX is configured, the UE shall report a CSI report only if it receives at least one CSI-RS transmission occasion for channel measurement and one CSI-RS / CSI-IM occasion for interference measurement not later than the CSI reference resource and within the DRX active time, otherwise it shall drop the report.

[0349] For a CSI reporting configuration in CSI-ReportConfig associated with higher layer parameter reportQuantity having at least 'RI' on a serving cell for which cell DTX is activated, the UE shall report a CSI report only if the UE receives at least one CSI-RS transmission occasion for each periodic CSI-RS resource or each semi-persistent CSI-RS resource for channel / interference measurement not later than the CSI reference resource and within the active period of cell DTX. Otherwise, the UE shall drop the CSI report.

[0350] As described above, multiple UE behaviors are defined for multiple values ​​of at least one setting of the report / resource setting method, the codebook type, and the report quantity (reportQuantity).

[0351] (UE Assumptions for CQI / PMI / RI Calculation) The UE assumes that the corresponding PDSCH signals transmitted on antenna ports [3000,...,3000+P+1] have a ratio of EPRE to CSI-RS EPRE equal to the ratio given by powerControlOffset.

[0352] (UE assumption for CQI / PMI / RI calculation for NCJT) v transmitted on P antenna ports of multiple CSI-RS resources in group j j The UE assumes that the corresponding PDSCH signal for this layer has a ratio of EPRE to CSI-RS EPRE equal to powerControlOffset.

[0353] (UE Assumptions for Calculating CQI / PMI / RI for CJT) PDSCH signals for v layers are distributed over multiple CSI-RS resources σ j The UE may assume that for all j=1,...,N0, the UE has the same ratio of EPRE to CSI-RS EPRE, which is equal to powerControlOffset.

[0354] (UE CSI Calculation Time: Physical Layer Procedures for Data / Physical Downlink Shared Channel Related Procedures) When a CSI request field on the DCI triggers a CSI report on the PUSCH, the UE provides a valid CSI report for the n-th triggered report if the following conditions are met: The first uplink symbol carrying one or more corresponding CSI reports and including the effect of timing advance is symbol Z. ref (symbol Z ref the first uplink symbol carrying the nth CSI report and including the effect of timing advance is symbol Z' ref (n) does not start earlier than (symbol Z'ref (n) or later).

[0355] Z ref is the next uplink symbol after the end of the last symbol of the PDCCH that triggers the one or more CSI reports, and its cyclic prefix (CP) is T proc,CSI =(Z)(2048+144)・κ2 -μ ・T C +T switch Z' is defined as a symbol starting at ref is the next uplink symbol after the end of the last symbol of the latest of the following times, when the A-CSI-RS is used for channel measurement for the n-th triggered CSI report, and its CP is T' proc,CSI =(Z')(2048+144)・κ2 -μ ・T C - A-CSI-RS resources for channel measurements, - A-CSI-IM used for interference measurements, and - A-NZP-CSI-RS for channel measurements.

[0356] T switch is defined in the specification and applies only if Z1 applies.

[0357] If a PDCCH reception includes two corresponding PDCCH candidates from two search space sets, the PDCCH candidate that ends later in time is used to determine the last symbol of the PDCCH that triggers the CSI report.

[0358] Z, Z' and μ are defined as follows:

[0359] Z = max(Z(m)) for m = 0,...,M-1. Z' = max(Z'(m)) for m = 0,...,M-1, where M is the number of updated CSI reports. (Z(m),Z'(m)) corresponds to the mth updated CSI report and is defined as follows: where CSI computation delay requirement 1 denotes (Z1,Z'1) [symbols] for μ∈{0,1,2,3}, and CSI computation delay requirement 2 denotes (Z1,Z'1), (Z2,Z'2), (Z3,Z'3) [symbols] for μ∈{0,1,2,3,4,5,6}.

[0360] - max{μ PDCCH ,μ CSI-RS ,μ UL}≦3, and L=0 CPUs are occupied, the CSI to be transmitted is a single CSI, corresponds to wideband frequency granularity, the CSI corresponds to a maximum of four CSI-RS ports in a single resource without CRI reporting, and CodebookType is set to 'typeI-SinglePanel' or reportQuantity is set to 'cri-RI-CQI', and if the CSI is triggered without a PUSCH with a transport block or HARQ-ACK or both, then (Z(m), Z'(m)) is defined as (Z1, Z'1) in CSI calculation delay requirement 1.

[0361] - If the CSI to be transmitted corresponds to wideband frequency granularity, and the CSI corresponds to up to four CSI-RS ports in a single resource without CRI reporting, and CodebookType is set to 'typeI-SinglePanel' or reportQuantity is set to 'cri-RI-CQI', then (Z(m), Z'(m)) is defined as (Z1, Z'1) in CSI calculation delay requirement 2.

[0362] - If the CSI to be transmitted corresponds to wideband frequency granularity and reportQuantity is set to 'ssb-Index-SINR', 'cri-SINR', 'ssb-Index-SINR-Index' or 'cri-SINR-Index', then (Z(m), Z'(m)) is defined as (Z1, Z'1) in CSI calculation delay requirement 2.

[0363] - reportQuantity is set to 'cri-RSRP', 'ssb-Index-RSRP', 'cri-RSRP-Index', or 'ssb-Index-RSRP-Index' and X μ According to the UE reported capability beamReportTiming, KB l If follows the capability beamSwitchTiming reported by the UE, then (Z(m),Z'(m)) is defined as (Z3,Z'3) in CSI calculation delay requirement 2.

[0364] - codebookType is set to 'typeII-CJT-r18' or 'typeII-CJT-PortSelection-r18' and the corresponding NZP-CSI-RS-ResourceSet for channel measurements is 1 < N TRP When configured with ≦4 resources, (Z(m), Z'(m)) is defined as (Z2, Z'2) or (Z2+r, Z'2+r) according to the capabilities reported by the UE, using (Z2, Z'2) in CSI calculation delay requirement 2.

[0365] - If CSI reporting is configured with N4=1, and codebookType is set to 'typeII-Doppler-r18' or 'typeII-Doppler-PortSelection-r18', and the corresponding NZP-CSI-RS-ResourceSet for channel measurement is aperiodic with K CSI-RS resources, then (Z(m),Z'(m)) is defined as (Z2+14(K-1)m,Z'2) using (Z2,Z'2) in CSI computation delay requirement 2.

[0366] - When CSI reporting is configured with N4=1, and codebookType is set to 'typeII-Doppler-r18' or 'typeII-Doppler-PortSelection-r18', and the corresponding NZP-CSI-RS-ResourceSet for channel measurement is periodic or semi-persistent with a single CSI-RS resource, then (Z(m),Z'(m)) is defined as (Z2+w,Z'2) using (Z2,Z'2) in CSI computation delay requirement 2.

[0367] - If CSI reporting is configured with N4>1 and codebookType is set to 'typeII-Doppler-r18' or 'typeII-Doppler-PortSelection-r18' and the corresponding NZP-CSI-RS-ResourceSet for channel measurement is aperiodic with K CSI-RS resources, then (Z(m),Z'(m)) is defined as (Z2+14(K-1)m,Z'2) or (Z2+14(K-1)m+r,Z'2+r) according to the capabilities reported by the UE, using (Z2,Z'2) in CSI computation delay requirement 2.

[0368] If CSI reporting is configured with N4>1, and codebookType is set to 'typeII-Doppler-r18' or 'typeII-Doppler-PortSelection-r18', and the corresponding NZP-CSI-RS-ResourceSet for channel measurement is periodic or semi-persistent with a single CSI-RS resource, then (Z(m),Z'(m)) is defined as (Z2+w,Z'2) according to the capabilities reported by the UE, using (Z2,Z'2) in CSI computation delay requirement 2. It is defined as (Z2+14(K-1)m,Z'2) or (Z2+14(K-1)m+r,Z'2+r) according to the capabilities reported by the UE.

[0369] - μ for CSI calculation delay requirements 1 and 2 is min(μ PDCCH ,μ CSI-RS ,μ UL ) where μPDCCH μ corresponds to the subcarrier spacing of the PDCCH on which the DCI is transmitted. UL μ corresponds to the subcarrier spacing of the PUSCH over which the CSI report will be transmitted. CSI-RS corresponds to the minimum subcarrier spacing of the A-CSI-RS triggered by the DCI.

[0370] In improving the Rel. 18 Type 2 codebook for CJT multi-TRP, N TRP For =1, (Z,Z') reuses the existing (Z,Z') value, and N TRP For capability 1, (Z,Z') reuses the existing (Z,Z') value, and for capability 2, (Z,Z') is the existing (Z,Z') value + r, and the value of r > 0 is the N that is configured. TRP It is being considered that the value may be dependent.

[0371] In this disclosure, Z ref , Z' ref (n), Z, Z', Z(m), Z'(m), the number of symbols from the end of the last symbol of the PDCCH that triggers a CSI report to the symbol at which UL transmission of that CSI report can begin, may be read interchangeably.

[0372] (Analysis) In Rel. 18, the use of CJT between TRPs is not limited to ideal environments with no delay / Doppler / phase difference, but also includes consideration of performing CJT in non-ideal environments (non-ideal backhauls) with delay / Doppler / phase difference between TRPs.

[0373] 6 is a diagram showing an example of a UE performing DL reception from multiple TRPs. As shown in FIG. 6, as a basic assumption, the UE may receive up to four DL-RSs (e.g., TRSs) from up to four CJT-TRPs (multiple TRPs #1 to #4 that support CJT).

[0374] In order to enable CJT in a non-ideal environment (non-ideal backhaul) where there are delay (time), Doppler (frequency), or phase differences between TRPs, it is also assumed that a mechanism (e.g., UE assisted calibration) will be supported in which the UE measures the delay, Doppler, or phase differences (e.g., offset) between TRPs and reports them to the base station, and the base station calibrates or precompensates for the differences.

[0375] However, there has been insufficient consideration on how to control the measurement / reporting of delay / Doppler / phase differences (e.g., offsets) between TRPs. If the measurement / reporting of delay / Doppler / phase differences (e.g., offsets) between TRPs is not performed properly, communication quality may be degraded.

[0376] Furthermore, in such a CJT using multiple (e.g., up to four) TRPs, given that the movements of the NW / UE are not synchronized, the delay / Doppler / phase differences (e.g., offset / shift) from different TRPs may be different, which may affect the performance of the CJT using multiple TRPs.

[0377] Rel. 18 also considers that for a PDSCH transmitted using CJT (CJT PDSCH), when two TCI states, each associated with a DL-RS, are indicated, the UE performs QCL estimation according to at least one of the following schemes: CJT scheme A: QCL is performed with both DL-RSs. CJT scheme B: QCL is performed with both DL-RSs, except for specific QCL parameters (e.g., Doppler shift / Doppler spread) for the second TCI state.

[0378] Figure 7 shows an example of a UE performing DL reception from multiple TRPs. In Rel. 19 UE-assisted calibration, in order to perform CJT under conditions where signals / channels between TRPs are not synchronized as shown in Figure 7, pre-compensation is considered to synchronize signals / channels between TRPs by applying pre-compensation to at least one of the following: CJT PDSCH, NZP-CSI-RS for CJT CSI codebook reporting.

[0379] Here, there has been insufficient consideration of QCL assumptions when the above-mentioned advance compensation is applied.

[0380] Furthermore, in Rel. 19, in a CJT using up to four TRPs, it is being considered to control the transmission and reception of terminals using more than two TCI states (for example, up to four TCI states).

[0381] However, there is insufficient consideration of how to indicate more than two TCI states.

[0382] Therefore, the inventors have studied communication control in a CJT using multiple TRPs / multiple panels and have come up with an idea for one aspect of this embodiment.

[0383] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Wireless communication methods, options, choices, and examples according to the embodiments may be applied independently or in combination.

[0384] (Various Reinterpretations) In the present disclosure, a word enclosed in "( )" in a sentence may indicate an explanation of the word immediately preceding it (for example, an explanation of spelling), a paraphrase, a specific example, a supplementary explanation, etc. Furthermore, in the present disclosure, a word enclosed in "[ ]" in a sentence may be interpreted including the word in the meaning of the entire sentence, or may be interpreted excluding (ignoring) the word in the meaning of the entire sentence. Note that "( )" and "[ ]" may also be used for purposes / meanings other than those mentioned above.

[0385] 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."

[0386] In the present disclosure, terms such as notify, activate, deactivate, indicate (or indicate), select, configure, update, and determine may be read interchangeably. In the present disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

[0387] 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.

[0388] 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.

[0389] 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.

[0390] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0391] 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 Ck , C n k In the present disclosure, x / y and floor(x / y) may be read as interchangeable.

[0392] 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 minus sign (-) on top of the x, or may be referred to as an x-bar. ＾ may be represented by placing a ^ above the x, and may be called an x-hat.

[0393] 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.

[0394] In this disclosure, the following abbreviations may be used: FDM: frequency division multiplexing TDM: time division multiplexing

[0395] In the present disclosure, the terms indicate, report, and select may be read interchangeably.

[0396] In the present disclosure, a cell group, a serving cell group, a master cell group (MCG), and a secondary cell group (SCG) may be interchangeable. L1 / L2, L1 / L2 signaling, and DCI / MAC CE may be interchangeable. A serving cell may be replaced with a cell that transmits a PDSCH. A candidate cell may refer to a cell that is a candidate to become a serving cell through L1 / L2 inter-cell mobility.

[0397] In the present disclosure, the terms cell, PCI, serving cell, source serving cell, source cell, CC, BWP, BWP within CC, and band may be interchangeable. In the present disclosure, the terms cell, PCI, cell with an additional PCI, additional cell, other cell, non-serving cell, cell with a different PCI, candidate cell, candidate serving cell, cell with a PCI different from the PCI of the current serving cell, another serving cell, and target cell may be interchangeable. In the present disclosure, the terms switch, change, and update may be interchangeable. The term serving cell may be interchangeable with the serving cell before the switch or the serving cell after the switch.

[0398] In the present disclosure, the terms TRP, CMR, NZP CSI-RS resource, NZP CSI-RS resource set, group of multiple NZP CSI-RS resources (multiple NZP CSI-RS resources), group of multiple NZP CSI-RS resource sets (multiple NZP CSI-RS resource sets), panel, group, set, CRI, resource, CSI-RS, TRS, and NZP CSI-RS resource set with TRS information (TRS-Info) may be interchangeable. In each embodiment, the terms CMR group / set, NZP CSI-RS resource group / set, and CRI group / set may be interchangeable.

[0399] In the present disclosure, a certain NZP-CSI-RS resource may correspond to a certain TRP, i.e., the NZP-CSI-RS resource and the TRP may be associated with each other.

[0400] In the present disclosure, DL-RS resources, NZP-CSI-RS resources, TRS resources, resources, and RS resources may be read interchangeably.

[0401] In the present disclosure, per resource, resource unit, per TRP, and TRP unit may be read interchangeably.

[0402] In the present disclosure, the terms resource and resource set may be read interchangeably.

[0403] In the present disclosure, frequency, Doppler shift, and Doppler may be read interchangeably.

[0404] In the present disclosure, the terms report amount, report content, report type, and type of report content may be read interchangeably.

[0405] In the present disclosure, UE-assisted calibration, UE-assisted CJT calibration, CJT calibration, CSI reporting for CJT calibration, CJT CSI, CJT CSI reporting, and CJT CSI codebook reporting may be read interchangeably.

[0406] In the present disclosure, the enhancement of UE reporting for CJT / DL-multi-TRP deployment in non-ideal synchronization and backhaul may be interchangeably read as "a case of a UE configured with new UE reporting for CJT / DL-multi-TRP deployment in non-ideal synchronization and backhaul" or "a case of a UE supporting new UE reporting for CJT / DL-multi-TRP deployment in non-ideal synchronization and backhaul." In other words, in the present disclosure, the case in which the enhanced UE reporting is applied may be interchangeably read as a case in which new UE reporting is configured for the UE or a case in which the UE supports new UE reporting.

[0407] Furthermore, the scenario to which the UE report of the present disclosure is applied may be both the non-ideal synchronization (A) and the backhaul (B) described above, or may be only the non-ideal synchronization (A) or only the non-ideal backhaul (B). That is, the application scenario (A / B) of the UE report of the present disclosure may differ for each embodiment / option described below.

[0408] (Wireless Communication Method) <First Embodiment> The first embodiment relates to a CJT PDSCH.

[0409] For at least one of the CJT PDSCH and the DMRS of the CJT PDSCH, new information / settings / conditions / situations (different from existing specifications) may be taken into account in the QCL assumption. The UE may determine the QCL assumption / relationship to be applied to at least one of the CJT PDSCH and the DMRS of the CJT PDSCH based on the new information / settings / conditions / situations.

[0410] In the present disclosure, the terms CJT PDSCH, PDSCH, CJT PDSCH DMRS, PDSCH DMRS, CJT PDSCH DMRS port, PDSCH DMRS port, etc. may be interchangeable. In the present disclosure, the terms "the UE makes a QCL assumption for a particular signal / channel (PDSCH, PDSCH DMRS, CSI-RS, and their antenna ports)," "the UE applies a QCL assumption to reception of a particular signal / channel," and "the UE assumes that a particular signal / channel is QCLed with the RS of the QCL assumption" may be interchangeable.

[0411] <<Embodiment 1.1>> Embodiment 1.1 relates to the new information / settings / conditions / situations.

[0412] The UE may determine the QCL assumption / relationship to be applied to the CJT PDSCH based on the new information / settings / conditions / situation.

[0413] For example, the UE may determine a first QCL assumption / relationship to be applied to the CJT PDSCH when it receives the new information / configuration, and may determine a second QCL assumption / relationship to be applied to the CJT PDSCH when it does not receive the new information / configuration.

[0414] For example, the UE may determine a first QCL assumption / relationship to be applied to the CJT PDSCH under the new conditions / situations, and may determine a second QCL assumption / relationship to be applied to the CJT PDSCH under conditions / situations other than the new conditions / situations.

[0415] The UE may determine that pre-compensation is applied to the CJT PDSCH when receiving the new information / configuration, and may also determine that pre-compensation is applied to the CJT PDSCH under the new conditions / situations.

[0416] The UE may determine that pre-compensation is not applied to the CJT PDSCH if it does not receive the new information / configuration. The UE may also determine that pre-compensation is not applied to the CJT PDSCH under conditions / situations other than the new conditions / situations.

[0417] The new information / settings / conditions / situations may include at least one of the following options 1.1-1 to 1.1-6.

[0418] Option 1.1-1: Whether or not CSI reporting for [UE-assisted] CJT calibration [in Rel. 19] is configured.

[0419] For example, when the UE receives information configuring CSI reporting [in Rel. 19] for [UE-assisted] CJT calibration, the UE may determine that pre-compensation is applied to the CJT PDSCH and may determine a first QCL assumption / relationship to be applied to the CJT PDSCH.

[0420] For example, if the UE does not receive information configuring CSI reporting [in Rel. 19] for [UE-assisted] CJT calibration, the UE may determine that pre-compensation is not applied to the CJT PDSCH and may determine a second QCL assumption / relationship to be applied to the CJT PDSCH.

[0421] Option 1.1-2: Whether time offset / frequency offset / phase offset pre-compensation is applied to PDSCH transmission.

[0422] For example, when the UE receives information indicating the application of time offset / frequency offset / phase offset pre-compensation to the PDSCH transmission, the UE may determine that pre-compensation is applied to the CJT PDSCH and may determine a first QCL assumption / relationship to be applied to the CJT PDSCH.

[0423] For example, if time offset / frequency offset / phase offset pre-compensation is not applied to the PDSCH transmission (the UE does not receive information indicating the application of time offset / frequency offset / phase offset pre-compensation to the PDSCH transmission), the UE may determine that pre-compensation is not applied to the CJT PDSCH and may determine a second QCL assumption / relationship to be applied to the CJT PDSCH.

[0424] For example, if time offset reporting is configured, the UE may assume that time offset pre-compensation is applied to the PDSCH (or may assume any of the QCL assumptions described in embodiment 1.2 below).

[0425] For example, if a UE reports a time offset at time t, the UE may assume that pre-compensation of the time offset is applied to the PDSCH until a period of Y time units has elapsed X time units after the report (or may assume any of the QCL assumptions described in embodiment 1.2 below). At least one of X and Y may be configured by RRC signaling or may be according to UE capabilities. The time unit may be a symbol, a slot, a subframe, a second, a millisecond, etc.

[0426] Option 1.1-3: Whether CJT CSI codebook reporting is configured or not.

[0427] For example, when CJT CSI codebook reporting is configured (the UE receives configuration information for CJT CSI codebook reporting), the UE may determine that pre-compensation is applied to the CJT PDSCH and may determine a first QCL assumption / relationship to be applied to the CJT PDSCH.

[0428] For example, if CJT CSI codebook reporting is not configured (the UE does not receive configuration information for CJT CSI codebook reporting), the UE may determine that pre-compensation is not applied to the CJT PDSCH and may determine a second QCL assumption / relationship to be applied to the CJT PDSCH.

[0429] Option 1.1-4: Whether the same (or corresponding) pre-compensation is configured / applied to the CSI-RS resources configured for the CJT PDSCH and the CJT CSI.

[0430] For example, the UE may determine a first QCL assumption / relationship to be applied to the CJT PDSCH when the same (or corresponding) pre-compensation is configured / applied to the CSI-RS resources configured for the CJT PDSCH and the CJT CSI.

[0431] For example, the UE may determine a second QCL assumption / relationship to be applied to the CJT PDSCH when the same (or corresponding) pre-compensation is not configured / applied to the CSI-RS resources configured for the CJT PDSCH and the CJT CSI (different pre-compensation is configured / applied to the CSI-RS resources configured for the CJT PDSCH and the CJT CSI).

[0432] In Option 1.1-4, the UE may receive multiple pieces of configuration information regarding pre-compensation for each of the CSI-RS resources configured for the CJT PDSCH and the CJT CSI. For example, a first pre-compensation may be configured / applied for one or more specific parameters (e.g., Doppler shift / Doppler spread / average delay / delay spread / time offset / frequency offset / phase offset) for the CJT PDSCH based on the first configuration information. Also, a second pre-compensation may be configured / applied for one or more specific parameters (e.g., Doppler shift / Doppler spread / average delay / delay spread / time offset / frequency offset / phase offset) for the CSI-RS resources configured for the CJT CSI based on the second configuration information. The UE may determine whether the first pre-compensation and the second pre-compensation are the same (or correspond to each other) based on the first configuration information and the second configuration information.

[0433] In option 1.1-4, the UE may receive one configuration information regarding pre-compensation for both the CJT PDSCH and the CSI-RS resources configured for the CJT CSI. Based on the one configuration information, the UE may determine whether the pre-compensation applied to the CJT PDSCH and the CSI-RS resources configured for the CJT CSI are the same (or correspond).

[0434] Option 1.1-5: Whether the UE reports time offset / frequency offset / phase offset that does not exceed a threshold.

[0435] For example, the UE may determine that pre-compensation is applied to the CJT PDSCH when reporting a time offset / frequency offset / phase offset that does not exceed a threshold, and may determine a first QCL assumption / relationship to be applied to the CJT PDSCH.

[0436] For example, if the UE reports a time offset / frequency offset / phase offset that exceeds a threshold, it may determine that pre-compensation is not applied to the CJT PDSCH and may determine a second QCL assumption / relationship to be applied to the CJT PDSCH.

[0437] In the present disclosure, not exceeding a threshold, being equal to or less than a threshold, being less than a threshold, etc. may be interpreted interchangeably. In the present disclosure, exceeding a threshold, being equal to or greater than a threshold, etc. may be interpreted interchangeably.

[0438] Option 1.1-6: Whether the NW / base station notifies the UE of the pre-compensated offset.

[0439] For example, if the NW / base station notifies the UE of the pre-compensated offset, the UE may determine that pre-compensation is applied to the CJT PDSCH and may determine a first QCL assumption / relationship to be applied to the CJT PDSCH.

[0440] For example, if the NW / base station does not notify the UE of the pre-compensated offset, the UE may determine that pre-compensation is not applied to the CJT PDSCH and may determine a second QCL assumption / relationship to be applied to the CJT PDSCH.

[0441] In the above options 1.1-1 to 1.1-6, information from the NW may be taken into account.

[0442] The new information / settings / conditions / status (any or a combination of options 1.1-1 to 1.1-6 above) may be associated with one (or each) TCI state. For example, if the new information / settings / conditions / status is associated with one (or each) TCI state, the settings of the respective TCI state may set / indicate the new information / settings / conditions / status.

[0443] The new information / settings / conditions / status (any or a combination of options 1.1-1 to 1.1-6 above) may not be associated with one (or each) TCI state. For example, if the new information / settings / conditions / status are not associated with one (or each) TCI state, the new information / settings / conditions / status may be set / indicated independently / separately from the setting of the respective TCI state.

[0444] If multiple indicated TCI states are indicated, the above new information / settings / conditions / status (any of the above options 1.1-1 to 1.1-6, or a combination thereof) may be judged / determined whether or not to apply for each indicated TCI state, or may be applied to all indicated TCI states.

[0445] For example, when a first indicated TCI state (e.g., a unified TCI state corresponding to a first TRP) and a second indicated TCI state (e.g., a unified TCI state corresponding to a second TRP) are indicated, the above new information / settings / conditions / status (any of options 1.1-1 to 1.1-6 above, or a combination thereof) may apply only to the first indicated TCI state, only to the second indicated TCI state, or to both the first indicated TCI state and the second indicated TCI state.

[0446] <<Embodiment 1.2>> Embodiment 1.2 relates to QCL parameters for CJT PDSCH (parameters for QCL of CJT PDSCH with DL-RS). The UE may determine QCL parameters for CJT PDSCH that are applied to at least one of the first QCL assumption / relationship and the second QCL assumption / relationship that are determined based on the information / configuration of embodiment 1.1. The QCL parameters for CJT PDSCH may include at least one of the following options 1.2-1 to 1.2-6.

[0447] Option 1.2-1: The UE may assume that the CJT PDSCH is in a QCL type A relationship with the DL-RS. That is, the UE may assume that the CJT PDSCH is QCL with the DL-RS with respect to Doppler shift, Doppler spread, average delay, and delay spread.

[0448] Option 1.2-2: The UE may assume that the CJT PDSCH and the DL-RS are in a QCL type B relationship. That is, the UE may assume that the CJT PDSCH is QCLed with the DL-RS for Doppler shift and Doppler spread.

[0449] Option 1.2-3: The UE may assume that the CJT PDSCH and the DL-RS are in a QCL type C relationship. That is, the UE may assume that the CJT PDSCH is QCLed with the DL-RS with respect to Doppler shift and average delay.

[0450] Option 1.2-4: The UE may assume that the CJT PDSCH is QCL'd with the DL-RS for the average delay and delay spread.

[0451] Option 1.2-5: The UE may assume that the CJT PDSCH is QCL'd with the DL-RS for Doppler shift.

[0452] Option 1.2-6: The UE may assume that the CJT PDSCH is QCL'd with the DL-RS for the average delay.

[0453] <<Embodiment 1.3>> Embodiment 1.3 relates to a DL-RS (QCL source RS) that has a QCL relationship with a CJT PDSCH. The QCL source RS may include at least one of the following options 1.3-1 and 1.3-2.

[0454] Option 1.3-1: DL-RS in all indication TCI states.

[0455] Option 1.3-2: Part of the DL-RS in the indication TCI state.

[0456] The DL-RS may be an SSB, a CSI-RS with repetition (CSI-RS with repetition), a CSI-RS without repetition (CSI-RS without repetition), a TRS, or a DMRS of a PDCCH / PDSCH.

[0457] 8A and 8B are diagrams illustrating an example of QCL assumptions for the CJT PDSCH according to embodiments 1.1 to 1.3. As illustrated in FIG. 8A and 8B, the UE may determine whether to apply the first QCL assumption or the second QCL assumption to the CJT PDSCH. For example, when pre-compensation is applied to the CJT PDSCH, as illustrated in FIG. 8A, the UE may assume that the DMRS port of the CJT PDSCH to which pre-compensation is applied is QCL-controlled with respect to the reference signal (DL-RS) of the indicated TCI state and the first QCL parameter (e.g., option 1.2-2 in embodiment 1.2). Furthermore, when pre-compensation is not applied to the CJT PDSCH, the UE may assume that the DMRS port of the CJT PDSCH to which pre-compensation is not applied is QCL-controlled with respect to the reference signal (DL-RS) of the indicated TCI state and the second QCL parameter (e.g., Option 1.2-1 of Embodiment 1.2). The parameter applied as the QCL parameter (first QCL parameter / second QCL parameter) may be a parameter related to an offset to which pre-compensation is not applied. The parameter not applied as the QCL parameter (parameter not included in the first QCL parameter / second QCL parameter) may be a parameter related to an offset to which pre-compensation is applied.

[0458] <<First Embodiment Example>> When multiple indicated TCI states are indicated, the UE may expect the CJT PDSCH to be QCL'd for DL-RS in all indicated TCI states and QCL type A. The multiple TCI states may be a first indicated TCI state and a second indicated TCI state.

[0459] If multiple indicated TCI states are indicated, the UE may expect the CJT PDSCH to be QCL'd for the DL-RS and QCL type A of one or more indicated TCI states, and QCL'd for the DL-RS and QCL type B of the other one or more indicated TCI states. In this case, only the delay offset may be pre-compensated.

[0460] If multiple indicated TCI states are indicated, the UE may expect the CJT PDSCH to be QCL'd with respect to the DL-RS and QCL type A of one or more indicated TCI states, and QCL'd with respect to the DL-RS and QCL type A of one or more other indicated TCI states, excluding Doppler shift and Doppler spread. In this case, only the frequency offset / Doppler offset may be pre-compensated.

[0461] If multiple indicated TCI states are indicated, the UE may expect the CJT PDSCH to be QCL'd for the DL-RS and QCL type A of one or more indicated TCI states, and QCL'd for the DL-RS and QCL type A of one or more other indicated TCI states, excluding the average delay. In this case, only the delay offset may be pre-compensated.

[0462] If multiple indicated TCI states are indicated, the UE may expect the CJT PDSCH to be QCL'd with respect to the DL-RS and QCL type A of one or more indicated TCI states, and QCL'd with respect to the DL-RS and QCL type A of one or more other indicated TCI states, excluding the Doppler shift. In this case, only the frequency offset / Doppler offset may be pre-compensated.

[0463] Even if more than one indicated TCI state is indicated in the TCI state indication field (e.g., a first indicated TCI state and a second indicated TCI state), the UE may expect the CJT PDSCH to be QCL'd with the DL-RS of one indicated TCI state (e.g., the first TCI state) and QCL type A. In this case, the UE may not expect / assume that the CJT PDSCH is QCL'd with the DL-RS of another TCI state (e.g., the second TCI state) (it may expect / assume that the CJT PDSCH is not QCL'd with the DL-RS of another TCI state).

[0464] New higher layer parameters (higher layer signaling, RRC parameters) for UE-assisted CJT calibration may be defined, which may indicate at least one of the following: - CSI reporting (in terms of delay (average delay / delay spread)) for UE-assisted CJT calibration [in Rel. 19] is configured - Pre-compensation of delay (average delay / delay spread) is applied

[0465] If the upper layer parameters indicating the application of a CJT scheme to PDSCH (cjtSchemePDSCH), the list of DL or joint TCI states (dl-OrJointTCI-StateList), and the upper layer parameters for [UE-assisted] CJT calibration are configured, two TCI states to be applied to reception of PDSCH are indicated, the UE reports support for two joint TCI states for CJT PDSCH, and the first CJT scheme (e.g., CJT scheme A) is configured, the UE may assume that the DMRS port of the PDSCH is QCL'd for DL-RS and QCL type A of both indicated TCI states.

[0466] If the upper layer parameters indicating the application of a CJT scheme to PDSCH (cjtSchemePDSCH), the list of DL or joint TCI states (dl-OrJointTCI-StateList), and the upper layer parameters for [UE-assisted] CJT calibration are configured, two TCI states to be applied to reception of PDSCH are indicated, the UE reports support for two joint TCI states for CJT PDSCH, and a second CJT scheme (e.g., CJT scheme B) is configured, the UE may assume that the DMRS port of the PDSCH is QCL'd with respect to the DL-RS of both indicated TCI states and QCL type A excluding the QCL parameters for Doppler shift and Doppler spread of the second indicated joint TCI state.

[0467] If the upper layer parameters indicating the application of a CJT scheme to the PDSCH (cjtSchemePDSCH), the list of DL or joint TCI states (dl-OrJointTCI-StateList), and the upper layer parameters for [UE-assisted] CJT calibration are configured, two TCI states to be applied to reception of the PDSCH are indicated, the UE reports support for two joint TCI states for the CJT PDSCH, and a third CJT scheme is configured, the UE may assume that the DMRS port of the PDSCH is QCL'd with respect to the DL-RS of both indicated TCI states and QCL type A, excluding the QCL parameters of the mean delay and delay spread of the second indicated joint TCI state. The third CJT scheme may be referred to as CJT scheme C.

[0468] In the present disclosure, QCL type A and QCL type B, excluding the QCL parameters of mean delay and delay spread, may be read interchangeably.

[0469] The first embodiment is not limited to the above example, and different examples may be applied under different conditions.

[0470] According to the first embodiment described above, even when the NW performs pre-compensation, the UE can take into account an appropriate QCL assumption for the CJT PDSCH.

[0471] Second Embodiment The second embodiment relates to NZP-CSI-RS [resource] for CJT CSI codebook reporting.

[0472] For the NZP-CSI-RS resource for CJT CSI codebook reporting, new information / settings / conditions / situations (different from existing specifications) may be taken into account in the QCL assumption. The UE may determine the QCL assumption / relationship to be applied to the NZP-CSI-RS [resource] for CJT CSI codebook reporting based on the new information / settings / conditions / situations.

[0473] In the present disclosure, NZP-CSI-RS [resource] for CJT CSI codebook reporting, CJT CSI-RS [resource], CSI-RS [resource] for CJT, CSI-RS [resource], etc. may be read interchangeably.

[0474] <<Embodiment 2.1>> Embodiment 2.1 relates to the new information / settings / conditions / situations.

[0475] The UE may determine the QCL assumptions / relationships to be applied to the CJT CSI-RS based on the new information / settings / conditions / situations.

[0476] For example, the UE may determine a first QCL assumption / relationship to be applied to the CJT CSI-RS when it receives the new information / configuration, and may determine a second QCL assumption / relationship to be applied to the CJT CSI-RS when it does not receive the new information / configuration.

[0477] For example, the UE may determine a first QCL assumption / relationship to be applied to the CJT CSI-RS under the new conditions / situations, and may also determine a second QCL assumption / relationship to be applied to the CJT CSI-RS under conditions / situations other than the new conditions / situations.

[0478] The UE may determine that pre-compensation is applied to the CJT CSI-RS when receiving the new information / configuration, and may also determine that pre-compensation is applied to the CJT CSI-RS under the new conditions / situations.

[0479] The UE may determine that pre-compensation is not applied to the CJT CSI-RS if it does not receive the new information / configuration. The UE may also determine that pre-compensation is not applied to the CJT CSI-RS under conditions / circumstances other than the new conditions / circumstances.

[0480] The new information / settings / conditions / situations may include at least one of the following options 2.1-1 to 2.1-5.

[0481] Option 2.1-1: Whether or not CSI reporting for [UE-assisted] CJT calibration [in Rel. 19] is configured.

[0482] For example, when the UE receives information configuring CSI reporting for UE-assisted CJT calibration (Rel. 19), the UE may determine that pre-compensation is applied to the CJT CSI-RS resource and may determine a first QCL assumption / relationship to be applied to the CJT CSI-RS resource.

[0483] For example, if the UE does not receive information configuring CSI reporting for UE-assisted CJT calibration (Rel. 19), the UE may determine that pre-compensation is not applied to the CJT CSI-RS resource and may determine a second QCL assumption / relationship to be applied to the CJT CSI-RS resource.

[0484] Option 2.1-2: Whether time offset / frequency offset / phase offset pre-compensation is applied to PDSCH transmission.

[0485] For example, when time offset / frequency offset / phase offset pre-compensation is applied to the CJT CSI-RS resource (when the UE receives information indicating the application of time offset / frequency offset / phase offset pre-compensation to the CJT CSI-RS resource), the UE may determine that pre-compensation is applied to the CJT CSI-RS [resource] and may determine a first QCL assumption / relationship to be applied to the CJT CSI-RS [resource].

[0486] For example, if time offset / frequency offset / phase offset pre-compensation is not applied to the CJT CSI-RS resource (the UE does not receive information indicating the application of time offset / frequency offset / phase offset pre-compensation to the CJT CSI-RS resource), the UE may determine that pre-compensation is not applied to the CJT CSI-RS [resource] and may determine a second QCL assumption / relationship to be applied to the CJT CSI-RS [resource].

[0487] For example, if time offset reporting is configured, the UE may assume that time offset pre-compensation is applied to the CJT CSI-RS resources (or may assume any of the QCL assumptions described in embodiment 2.2 below).

[0488] For example, if a UE reports a time offset at time t, the UE may assume that pre-compensation of the time offset is applied to the CJT CSI-RS resource until a period of Y time units has elapsed X time units after the report (or may assume any of the QCL assumptions described in embodiment 2.2 below). At least one of X and Y may be configured by RRC signaling or may be according to UE capabilities. The time unit may be a symbol, a slot, a subframe, a second, a millisecond, etc.

[0489] Option 2.1-3: Whether CJT CSI codebook reporting is configured or not.

[0490] For example, when CJT CSI codebook reporting is configured (when the UE receives configuration information for CJT CSI codebook reporting), the UE may determine that pre-compensation is applied to the CJT CSI-RS [resource] and may determine a first QCL assumption / relationship to be applied to the CJT CSI-RS [resource].

[0491] For example, when CJT CSI codebook reporting is not configured (the UE does not receive configuration information for CJT CSI codebook reporting), the UE may determine that pre-compensation is not applied to the CJT CSI-RS [resource] and may determine a second QCL assumption / relationship to be applied to the CJT CSI-RS [resource].

[0492] Option 2.1-4: Whether the UE reports time offset / frequency offset / phase offset that does not exceed a threshold.

[0493] For example, the UE may determine that pre-compensation is applied to the CJT CSI-RS [resource] when reporting a time offset / frequency offset / phase offset that does not exceed a threshold, and may determine a first QCL assumption / relationship to be applied to the CJT CSI-RS [resource].

[0494] For example, if the UE reports a time offset / frequency offset / phase offset that exceeds a threshold, it may determine that pre-compensation is not applied to the CJT CSI-RS [resource] and may determine a second QCL assumption / relationship to be applied to the CJT CSI-RS [resource].

[0495] Option 2.1-5: Whether the NW / base station notifies the UE of the pre-compensated offset.

[0496] For example, when the NW / base station notifies the UE of the pre-compensated offset, it may determine that pre-compensation is applied to the CJT CSI-RS [resource] and may determine a first QCL assumption / relationship to be applied to the CJT CSI-RS [resource].

[0497] For example, if the NW / base station does not notify the UE of the pre-compensated offset, it may determine that pre-compensation is not applied to the CJT CSI-RS [resource] and may determine a second QCL assumption / relationship to be applied to the CJT CSI-RS [resource].

[0498] In the above options 2.1-1 to 2.1-5, information from the NW may be taken into account.

[0499] The new information / settings / conditions / status (any or a combination of options 2.1-1 to 2.1-5 above) may be associated with one (or each) TCI state. For example, if the new information / settings / conditions / status is associated with one (or each) TCI state, the settings of the respective TCI state may set / indicate the new information / settings / conditions / status.

[0500] The new information / settings / conditions / status (any or a combination of options 2.1-1 to 2.1-5 above) may not be associated with one (or each) TCI state. For example, if the new information / settings / conditions / status are not associated with one (or each) TCI state, the new information / settings / conditions / status may be set / indicated independently / separately from the setting of the respective TCI state.

[0501] If multiple indicated TCI states are indicated, the above new information / settings / conditions / status (any of the above options 1.1-1 to 1.1-6, or a combination thereof) may be judged / determined whether or not to apply for each indicated TCI state, or may be applied to all indicated TCI states.

[0502] For example, when a first indicated TCI state (e.g., a unified TCI state corresponding to a first TRP) and a second indicated TCI state (e.g., a unified TCI state corresponding to a second TRP) are indicated, the above new information / settings / conditions / status (any of options 2.1-1 to 2.1-5 above, or a combination thereof) may apply only to the first indicated TCI state, only to the second indicated TCI state, or to both the first indicated TCI state and the second indicated TCI state.

[0503] <<Embodiment 2.2>> Embodiment 2.2 relates to QCL parameters for a CJT CSI-RS [resource] (parameters for QCL of a CJT CSI-RS [resource] with a DL-RS). The UE may determine QCL parameters for the CJT CSI-RS [resource] that are applied to at least one of a first QCL assumption / relationship and a second QCL assumption / relationship that are determined based on the information / configuration of embodiment 2.1. The QCL parameters for the CJT CSI-RS [resource] may include at least one of the following options 2.2-1 to 2.2-6.

[0504] Option 2.2-1: The UE may assume that the CJT CSI-RS [resource] is in a QCL type A relationship with the DL-RS. That is, the UE may assume that the CJT CSI-RS is QCL with the DL-RS with respect to Doppler shift, Doppler spread, mean delay, and delay spread.

[0505] Option 2.2-2: The UE may assume that the CJT CSI-RS [resource] is in a QCL type B relationship with the DL-RS. In other words, the UE may assume that the CJT CSI-RS is QCL with the DL-RS with respect to Doppler shift and Doppler spread.

[0506] Option 2.2-3: The UE may assume that the CJT CSI-RS [resource] is in a QCL type C relationship with the DL-RS. That is, the UE may assume that the CJT CSI-RS is QCL with the DL-RS in terms of Doppler shift and average delay.

[0507] Option 2.2-4: The UE may assume that the CJT CSI-RS [resource] is QCL'd with the DL-RS for average delay and delay spread.

[0508] Option 2.2-5: The UE may assume that the CJT CSI-RS [resource] is QCL'd with the DL-RS for Doppler shift.

[0509] Option 2.2-6: The UE may assume that the CJT CSI-RS [resource] is QCL'd with the DL-RS for average delay.

[0510] <<Embodiment 2.3>> Embodiment 2.3 relates to a DL-RS (QCL source RS) that is in a QCL relationship with a CJT CSI-RS [resource]. The QCL source RS may include at least one of the following options 2.3-1 and 2.3-3.

[0511] Option 2.3-1: TRS.

[0512] Option 2.3-2: CSI-RS without TRS and with repetition, or CSI-RS without TRS and without repetition.

[0513] Option 2.3-3: DL-RS.

[0514] The DL-RS of Option 2.3-3 may be an SSB, a CSI-RS with repetition (CSI-RS with repetition), a CSI-RS without repetition (CSI-RS without repetition), a TRS, or a DMRS of a PDCCH / PDSCH.

[0515] 9A and 9B are diagrams illustrating an example of QCL assumptions for a CJT CSI-RS according to embodiments 2.1 to 2.3. As illustrated in FIG. 9A and 9B, a UE may determine whether to apply a first QCL assumption or a second QCL assumption to the CJT CSI-RS. For example, when pre-compensation is applied to the CJT CSI-RS, as illustrated in FIG. 9A, the UE may assume that the CJT CSI-RS to which pre-compensation is applied is QCL-qualified with respect to the reference signal (DL-RS) of the indicated TCI state and the first QCL parameter (e.g., option 2.2-2 in embodiment 2.2). Furthermore, when pre-compensation is not applied to the CJT CSI-RS, the UE may assume that the CJT CSI-RS to which pre-compensation is not applied is QCLed with respect to the reference signal (DL-RS) of the indicated TCI state and the second QCL parameter, as shown in FIG. 9B (e.g., Option 2.2-1 of Embodiment 2.2). The parameter applied as the QCL parameter (first QCL parameter / second QCL parameter) may be a parameter related to an offset to which pre-compensation is not applied. The parameter not applied as the QCL parameter (parameter not included in the first QCL parameter / second QCL parameter) may be a parameter related to an offset to which pre-compensation is applied.

[0516] <<Example of Second Embodiment>> When multiple indicated TCI states are indicated, the UE may expect the CJT CSI-RS [resources] to be QCL'd for the DL-RS and QCL type A of all indicated TCI states.

[0517] If multiple indicated TCI states are indicated, the UE may expect the CJT CSI-RS [resources] to be QCL'd for the DL-RS of one or more indicated TCI states and QCL type A, and QCL'd for the DL-RS of one or more other indicated TCI states and QCL type B. In this case, only the delay offset may be pre-compensated.

[0518] If multiple indicated TCI states are indicated, the UE may expect the CJT CSI-RS [resource] to be QCLed with the DL-RS of one or more indicated TCI states with respect to QCL type A, and QCLed with the DL-RS of one or more other indicated TCI states with respect to QCL type A excluding Doppler shift and Doppler spread. In this case, only the frequency offset / Doppler offset may be compensated.

[0519] If multiple indicated TCI states are indicated, the UE may expect the CJT CSI-RS [resource] to be QCLed with the DL-RS of one or more of the indicated TCI states with QCL type A, and QCLed with the DL-RS of one or more other indicated TCI states with QCL type A excluding the average delay. In this case, only the delay offset may be compensated.

[0520] If multiple indicated TCI states are indicated, the UE may expect the CJT CSI-RS [resource] to be QCLed with the DL-RS of one or more indicated TCI states with respect to QCL type A, and QCLed with the DL-RS of one or more other indicated TCI states with respect to QCL type A excluding the Doppler shift. In this case, only the frequency offset / Doppler offset may be compensated.

[0521] Even if more than one indicated TCI state is indicated in the TCI state indication field (e.g., a first indicated TCI state and a second indicated TCI state), the UE may expect the CJT CSI-RS [resource] to be QCL'd with the DL-RS of one indicated TCI state (e.g., the first TCI state) for QCL type A. In this case, the UE may not expect / assume that the CJT CSI-RS is QCL'd with the DL-RS of another TCI state (e.g., the second TCI state) (it may expect / assume that it is not QCL'd with the DL-RS of another TCI state).

[0522] Similar to the first embodiment, new higher layer parameters (higher layer signaling, RRC parameters) for UE-assisted CJT calibration may be defined, which may indicate at least one of the following: - CSI reporting (in terms of delay (average delay / delay spread)) for UE-assisted CJT calibration [in Rel. 19] is configured - Pre-compensation of delay (average delay / delay spread) is applied

[0523] If higher layer parameters indicating the application of a CJT scheme to a CSI-RS [resource], a list of DL or joint TCI states (dl-OrJointTCI-StateList), and higher layer parameters for [UE-assisted] CJT calibration are configured, two TCI states to be applied to reception of the CSI-RS [resource] are indicated, the UE reports support for two joint TCI states for the CJT CSI-RS [resource], and the first CJT scheme (e.g., CJT scheme A) is configured, the UE may assume that the CSI-RS [resource] is QCL'd for the DL-RS and QCL type A of both indicated TCI states.

[0524] If higher layer parameters indicating the application of a CJT scheme to a CSI-RS [resource], a list of DL or joint TCI states (dl-OrJointTCI-StateList), and higher layer parameters for [UE-assisted] CJT calibration are configured, two TCI states to be applied to reception of the CSI-RS [resource] are indicated, the UE reports support for two joint TCI states for the CJT CSI-RS [resource], and a second CJT scheme (e.g., CJT scheme B) is configured, the UE may assume that the CSI-RS [resource] is QCL'd with respect to the DL-RS of both indicated TCI states and QCL type A excluding the QCL parameters for Doppler shift and Doppler spread of the second indicated joint TCI state.

[0525] If the higher layer parameters indicating the application of the CJT scheme to the CSI-RS [resource], the list of DL or joint TCI states (dl-OrJointTCI-StateList), and the higher layer parameters for [UE-assisted] CJT calibration are configured, two TCI states to be applied to reception of the CSI-RS [resource] are indicated, the UE reports support for the two joint TCI states for the CJT CSI-RS [resource], and a third CJT scheme is configured, the UE may assume that the CSI-RS [resource] is QCLed with respect to the DL-RS in both indicated TCI states and QCL type A except for the QCL parameters of the mean delay and delay spread of the second indicated joint TCI state. The third CJT scheme may be referred to as CJT scheme C.

[0526] The second embodiment is not limited to the above example, and different examples may be applied under different conditions.

[0527] The QCL relationship / QCL assumption in the second embodiment may be a QCL relationship / QCL assumption between a CSI-RS for a CJT CSI codebook report / TRS and a CJT PDSCH. Also, the QCL relationship / QCL assumption in the second embodiment may be a QCL relationship / QCL assumption between a CSI-RS for something other than a CJT CSI codebook report and a CSI-RS for a CJT CSI codebook report.

[0528] According to the second embodiment described above, even if the NW performs pre-compensation, the UE can consider an appropriate QCL assumption for the NZP-CSI-RS for CJT CSI codebook reporting.

[0529] Third Embodiment The third embodiment relates to the TCI state.

[0530] In the CJT PDSCH, the NZP-CSI-RS for CJT CSI codebook reporting, and the Rel. 19 CSI reporting for UE-assisted calibration, the UE may receive up to four DL-RSs (e.g., TRSs) from up to four CJT-TRPs (TRPs #1 to #4 that support CJT). Therefore, more than two TCI states may be indicated. For example, the number of TCI states may be four.

[0531] The method of setting / indicating the TCI status may be at least one of the following options 3.1-1 to 3.1-4.

[0532] Option 3.1-1: One TCI status indication may be configured within one DCI, and the TCI status indication may indicate codepoints associated with more than two TCI states.

[0533] In Option 3.1-1, the more than two TCI states may be up to two TCI states per the Rel. 18 multi-TRP unified TCI indication, plus additional TCI states (for Rel. 19 and later).

[0534] In option 3.1-1, more than two TCI states may be a new (for Rel. 19 and later) set of up to four TCI states.

[0535] Option 3.1-2: More than one TCI status indication may be configured within one DCI. Each TCI status indication may indicate codepoints associated with up to two TCI states.

[0536] Option 3.1-3: The TCI state may be a combination of the TCI state indicated by the DCI and the TCI state set / indicated by RRC signaling. One TCI state indication may be set within one DCI. The TCI state indication may indicate codepoints associated with up to two TCI states. Also, additional TCI states (e.g., up to two TCI states) may be set / indicated by RRC signaling.

[0537] Option 3.1-4: Up to four TCI states may be configured by RRC signaling. The UE may receive RRC signaling to indicate up to four TCI states for the CJT PDSCH in Rel. 19.

[0538] The DL-RS in the TCI state may be at least one of the following options 3.2-1 to 3.2-3.

[0539] Option 3.2-1: TRS.

[0540] Option 3.2-2: NZP-CSI-RS with repetition, or NZP-CSI-RS without repetition.

[0541] Option 3.2-3: NZP-CSI-RS configured for Rel. 19 CSI reporting for UE-assisted calibration.

[0542] According to the third embodiment described above, it is possible to appropriately set / indicate the TCI state in the CJT PDSCH, the NZP-CSI-RS for CJT CSI codebook reporting, and the Rel. 19 CSI report for UE-assisted calibration.

[0543] <Supplementary Information> <<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), a specific signal / channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.

[0544] 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, which is not defined in existing standards.

[0545] When the notification is made by DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0546] Furthermore, notification of any information to the UE in the above embodiments may be performed periodically, semi-persistently, or aperiodically.

[0547] In the above embodiment, the UE may receive information about the following QCL rules (QCL types) from the network: QCL type A QCL type B QCL type C QCL type D

[0548] In the above-described embodiment, 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

[0549] In the above-described embodiment, 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).

[0550] <<Notification of Information from UE>> In the above-described embodiments, notification of any information from the UE [to the NW] (in other words, transmission / report of any information from the UE to the BS) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.

[0551] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new LCID, which is not defined in existing standards, in the MAC subheader.

[0552] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0553] Furthermore, any information in the above-described embodiments may be notified from the UE periodically, semi-persistently, or aperiodically.

[0554] <<Regarding Application of Each Embodiment>> In a UE / BS, specific (one or more) processes / operations / controls / assumptions / information for at least one of the above-mentioned embodiments may be applied (used) when one or more of the following conditions are met: - a higher layer parameter indicating the specific processes / operations / controls / assumptions / information is configured; - the specific processes / operations / controls / assumptions / information is determined based on related higher layer parameters; - the specific processes / operations / controls / assumptions / information is specified / activated / triggered by a MAC CE / DCI / UCI / resource / channel / RS; - a specific UE capability indicating (or related to) the specific processes / operations / controls / assumptions / information is reported or supported; - the application of the specific processes / operations / controls / assumptions / information is determined based on specific conditions.

[0555] The specific UE capability may indicate at least one of the following: Supporting the specific process / operation / control / assumption / information Supporting at least one of CJT PDSCH, NZP-CSI-RS for CJT CSI codebook reporting, and Rel. 19 CSI reporting for UE-assisted calibration Supporting more than two TCI states.

[0556] 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, a band, a band combination, a BWP, a 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).

[0557] Furthermore, the specific UE capability may be a capability that is applied to all duplexing methods (commonly regardless of the duplexing method), or may be a capability for each duplexing method (e.g., Time Division Duplex (TDD) or Frequency Division Duplex (FDD)).

[0558] If the above conditions are not met, the UE / BS may follow the behavior specified in existing 3GPP releases.

[0559] (Supplementary Notes) The following inventions are supplementary notes regarding one embodiment of the present disclosure. [Supplementary Note 1] A terminal including: a receiving unit that receives an indication of a plurality of Transmission Configuration Indication (TCI) states; and a control unit that determines, based on a setting related to Coherent Joint Transmission (CJT) and the indication, a Quasi-Co-Location (QCL) relationship between a Demodulation Reference Signal (DMRS) port of a Physical Downlink Shared Channel (PDSCH) transmitted using CJT and at least one reference signal of the plurality of TCI states. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the control unit assumes that the DMRS port of the PDSCH is in QCL with the reference signal for a mean delay and a delay spread. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the control unit assumes that the DMRS port of the PDSCH is in QCL with the reference signal for a Doppler shift. [Supplementary Note 4] The terminal according to any one of Supplementary Note 1 to Supplementary Note 3, wherein the control unit assumes that a DMRS port of the PDSCH is QCL with the reference signal for an average delay.

[0560] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal including: a receiving unit that receives an indication of a plurality of Transmission Configuration Indication (TCI) states; and a control unit that determines, based on a configuration related to Coherent Joint Transmission (CJT) and the indication, a Quasi-Co-Location (QCL) relationship between a Channel State Information Reference Signal (CSI-RS) for reporting a Channel State Information (CSI) codebook for CJT and at least one reference signal of the plurality of TCI states. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the control unit assumes that the CSI-RS is in QCL with the reference signal for a mean delay and a delay spread. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the control unit assumes that the CSI-RS is in QCL with the reference signal for a Doppler shift. [Supplementary Note 4] The terminal according to any one of Supplementary Note 1 to Supplementary Note 3, wherein the control unit assumes that the CSI-RS is a QCL with the reference signal for an average delay.

[0561] (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.

[0562] 10 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) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0563] 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.

[0564] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (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.

[0565] 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 SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0566] 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 the base station 10.

[0567] 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 supercell) may be composed of multiple [virtual] cells (which may be called, for example, subcells). A supercell may correspond to a cell with a fixed physical range, and a subcell may correspond to a cell with a quasi-static / dynamically variable physical range. In this case, the wireless communication system 1 may be called a cell-free system.

[0568] 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 (CCs) and dual connectivity (DC).

[0569] 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 higher than 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 correspond to a higher frequency band than FR2.

[0570] 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.

[0571] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 / Xn interface, etc.) or wirelessly (e.g., 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.

[0572] 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.

[0573] The core network 30 may include network functions (Network Functions (NF)) 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 Operation, Administration and Maintenance (Management) (OAM). A single network node may provide multiple functions. Communication with an external network (e.g., the Internet) may also be performed via the DN.

[0574] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0575] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless 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).

[0576] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0577] 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.

[0578] 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)), or the like may be used as an uplink channel.

[0579] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0580] 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.

[0581] 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 a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0582] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching 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 the CORESET associated with a certain search space based on the search space configuration.

[0583] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0584] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation 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.

[0585] 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.

[0586] 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, as the DL-RS, 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.

[0587] 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 an SS (PSS, SSS) and a PBCH (and a 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 a reference signal.

[0588] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like 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).

[0589] 11 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.

[0590] 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.

[0591] 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.

[0592] 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, control information, sequences, etc. to be transmitted as signals, 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.

[0593] 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.

[0594] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, the RF unit 122, and a measurement unit 123.

[0595] 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 relates, such as an array antenna.

[0596] 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.

[0597] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0598] The transmitter / receiver unit 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.

[0599] The transmitter / receiver unit 120 (transmission processing unit 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.

[0600] The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

[0601] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 130.

[0602] 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.

[0603] 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.

[0604] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30 (e.g., network nodes that provide NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0605] The transmitter and receiver of the base station 10 in the present disclosure may be configured by at least one of the transmitter / receiver 120, the transmitter / receiver antenna 130, and the transmission path interface 140.

[0606] The base station 10 may be separated into three elements: a radio unit (RU), a distributed unit (DU), and a central unit (CU). For example, the RU may implement RF processing (digital beamforming, digital-to-analog conversion, analog beamforming, etc.) and lower-level functions of the physical layer (precoding, IFFT, FFT, etc.). The DU may implement higher-level functions of the physical layer (coding to resource element mapping, etc.), MAC layer functions, and RLC layer functions. The CU may implement the functions of the PDCP layer, Service Data Adaptation Protocol (SDAP) layer, and RRC layer.

[0607] In the present disclosure, the base station 10 may include a single device that realizes all of the functions of the RU, DU, and CU, or may include multiple devices that each realize 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.

[0608] The transceiver 120 may transmit multiple Transmission Configuration Indication (TCI) state indications.

[0609] The control unit 110 may also control the transmission of settings related to Coherent Joint Transmission (CJT) to determine a Quasi-Co-Location (QCL) relationship between a Demodulation Reference Signal (DMRS) port of a Physical Downlink Shared Channel (PDSCH) transmitted by a terminal using CJT and at least one reference signal of the multiple TCI states.

[0610] The control unit 110 may also control the transmission of settings related to Coherent Joint Transmission (CJT) to enable the terminal to determine a Quasi-Co-Location (QCL) relationship between a Channel State Information Reference Signal (CSI-RS) for reporting a Channel State Information (CSI) codebook for CJT and at least one reference signal of the multiple TCI states.

[0611] (User Terminal) Fig. 12 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.

[0612] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0613] 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, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

[0614] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may 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.

[0615] 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 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.

[0616] 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.

[0617] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0618] 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.

[0619] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0620] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0621] The transmitter / receiver unit 220 (transmission processing unit 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.

[0622] 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 if not, it may not be necessary to perform DFT processing as the transmission processing.

[0623] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0624] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.

[0625] The transceiver unit 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, and acquire user data, etc.

[0626] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, 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.

[0627] 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.

[0628] The transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0629] The transceiver 220 may receive a plurality of Transmission Configuration Indication (TCI) state indications (eg, at least one of options 3.1-1 through 3.1-4 in the third embodiment).

[0630] The control unit 210 may determine a Quasi-Co-Location (QCL) relationship between a Demodulation Reference Signal (DMRS) port of a Physical Downlink Shared Channel (PDSCH) transmitted using CJT and at least one reference signal of the multiple TCI states (e.g., at least one of options 1.3-1 and 1.3-2 of embodiment 1.3) based on settings related to Coherent Joint Transmission (CJT) (e.g., at least one of options 1.1-1 to 1.1-6 in embodiment 1.1) and the instruction.

[0631] The control unit 210 may assume that the DMRS port of the PDSCH is the reference signal and QCL for the average delay and delay spread.

[0632] The control unit 210 may assume that the DMRS port of the PDSCH is the reference signal and QCL with respect to the Doppler shift.

[0633] The control unit 210 may assume that the DMRS port of the PDSCH is QCL with respect to the average delay.

[0634] The control unit 210 may determine a Quasi-Co-Location (QCL) relationship between a Channel State Information Reference Signal (CSI-RS) for reporting a Channel State Information (CSI) codebook for CJT and at least one reference signal of the multiple TCI states (e.g., at least one of options 2.3-1 and 2.3-3 in embodiment 2.3) based on settings related to Coherent Joint Transmission (CJT) (e.g., at least one of options 2.1-1 to 2.1-5 in embodiment 2.1) and the instruction.

[0635] The controller 210 may assume that the CSI-RS is the reference signal and QCL for the average delay and delay spread.

[0636] The control unit 210 may assume that the CSI-RS is the reference signal and QCL with respect to the Doppler shift.

[0637] The control unit 210 may assume that the CSI-RS is QCL with the reference signal for the average delay.

[0638] (Hardware Configuration) Note that 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 be realized by combining software with the single device or the multiple devices.

[0639] 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 described above, the implementation method of each is not particularly limited.

[0640] For example, a base station, a user terminal, or the like 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. 13 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, and the like.

[0641] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used 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.

[0642] 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.

[0643] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified 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.

[0644] 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), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0645] 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 implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0646] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0647] Storage 1003 is a computer-readable recording medium and may be composed of 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, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0648] 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.

[0649] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0650] 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.

[0651] 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 this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0652] In addition, the devices included in the core network 30 (for example, network nodes that provide NF) may also be realized by the above-mentioned functional block / hardware configuration.

[0653] (Modifications) Note that terms described 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.

[0654] 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.

[0655] 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, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0656] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0657] 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.

[0658] 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.

[0659] For example, one subframe may be referred to as a TTI, 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 the subframe and the 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.

[0660] 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. Note that the definition of TTI is not limited to this.

[0661] 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.

[0662] 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.

[0663] 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.

[0664] 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 greater than or equal to 1 ms.

[0665] 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 be determined based on numerology.

[0666] 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, each of which may be composed of one or more resource blocks.

[0667] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0668] 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.

[0669] A Bandwidth Part (BWP), which may also be referred to as a partial 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 BWP and numbered within the BWP.

[0670] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0671] 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."

[0672] 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.

[0673] 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.

[0674] 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.

[0675] 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.

[0676] 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.

[0677] 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.

[0678] 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 / specifying (or relating to) the value of the any information.

[0679] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the 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.

[0680] Note that the physical layer signaling may be referred to as 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 referred to as 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).

[0681] 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).

[0682] 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).

[0683] 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.

[0684] 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), these wired and / or wireless technologies are included within the definition of transmission media.

[0685] 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).

[0686] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "layer," "number of layers," "rank," "resource," "resource set," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," "UE panel," "transmitting entity," "receiving entity," etc. may be used interchangeably.

[0687] 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. Furthermore, the spatial domain transmission filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.

[0688] 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.

[0689] 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.

[0690] 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.

[0691] Furthermore, in the present disclosure, terms such as "QCL," "QCL assumption," "QCL relationship," "QCL type information," "QCL property / properties," "specific QCL type (e.g., Type A, Type D) property," and "specific QCL type (e.g., Type A, Type D)" may be interchangeable.

[0692] In the present disclosure, terms such as index, identifier (ID), indicator, indication, and resource ID may be interchangeable. In the present disclosure, terms such as sequence, list, set, group, cluster, and subset may be interchangeable.

[0693] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interchangeable. The "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 the TCI may be interchangeable. The spatial relationship information and the spatial relationship may be interchangeable.

[0694] In the present 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.

[0695] 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 partitioned 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 terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0696] 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.

[0697] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0698] 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.

[0699] 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.

[0700] 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.

[0701] 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.

[0702] 14 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, 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.

[0703] 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 a user.

[0704] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (for example, 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).

[0705] 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.

[0706] 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 (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0707] 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.

[0708] The driving assistance system unit 64 includes various devices for providing functions to prevent accidents and reduce 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.

[0709] 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.

[0710] 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 base station 10 or the user terminal 20 described above. Furthermore, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (or may function as at least one of the base station 10 and the user terminal 20).

[0711] 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.

[0712] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device 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)).

[0713] 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.

[0714] 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 an uplink channel and a downlink channel may be read as a sidelink channel.

[0715] 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.

[0716] 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), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0717] 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 particular order presented.

[0718] 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 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802. The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0719] 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."

[0720] 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.

[0721] 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.

[0722] 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.

[0723] 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 kind of action. In the present disclosure, "determination" may be read interchangeably with the above-mentioned actions.

[0724] 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...."

[0725] 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 ..." or "do ... (if the above "..." is a to-infinitive, a verb with "to")," etc. "does not expect ..." may be interchangeably read as "be not expected ..." or "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).

[0726] 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.

[0727] 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."

[0728] 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.

[0729] 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."

[0730] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0731] 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.

[0732] 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 "i-th" (i is an arbitrary integer) attached (for example, "highest" may be interchangeable with "i-th highest").

[0733] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0734] 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 approximately zero (immediately after or immediately before). A time offset may also be applied to the time at which A occurs. For example, "A" may be interchangeable with "before / after a 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.

[0735] 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.

[0736] 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 terminal having a receiving unit that receives instructions of multiple Transmission Configuration Indication (TCI) states, and a control unit that determines a Quasi-Co-Location (QCL) relationship between a Demodulation Reference Signal (DMRS) port of a Physical Downlink Shared Channel (PDSCH) transmitted using Coherent Joint Transmission (CJT) and at least one reference signal of the multiple TCI states based on settings related to CJT and the instructions.

2. The terminal according to claim 1, wherein the control unit assumes that the DMRS port of the PDSCH is the reference signal and QCL for an average delay and a delay spread.

3. The terminal according to claim 1, wherein the control unit assumes that the DMRS port of the PDSCH is the reference signal and QCL with respect to Doppler shift.

4. The terminal according to claim 1, wherein the control unit assumes that the DMRS port of the PDSCH is the reference signal and QCL with respect to an average delay.

5. A wireless communication method for a terminal, comprising: a step of receiving an indication of a plurality of Transmission Configuration Indication (TCI) states; and a step of determining, based on settings related to Coherent Joint Transmission (CJT) and the indication, a Quasi-Co-Location (QCL) relationship between a Demodulation Reference Signal (DMRS) port of a Physical Downlink Shared Channel (PDSCH) transmitted using CJT and at least one reference signal of the plurality of TCI states.

6. A base station having: a transmitting unit that transmits indications of multiple Transmission Configuration Indication (TCI) states; and a control unit that controls the transmission of settings related to Coherent Joint Transmission (CJT) for a terminal to determine a Quasi-Co-Location (QCL) relationship between a Demodulation Reference Signal (DMRS) port of a Physical Downlink Shared Channel (PDSCH) transmitted using CJT and at least one reference signal of the multiple TCI states.

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