Terminal, wireless communication method, base station and system

Abstract

A terminal according to one embodiment of the present disclosure is characterized by including a receiving unit for receiving indication information relating to a plurality of transmission configuration indicator (TCI) states to be applied to a plurality of signals, and a control unit for applying the plurality of TCI states respectively to signals transmitted and received to and from a plurality of transmission / reception points (TRPs), on the basis of the indication information, each of the plurality of TCI states being either a TCI state to be applied to both a downlink (DL) signal and an uplink (UL) signal, or being one of a TCI state to be applied to a DL signal and a TCI state to be applied to a UL signal, and the each of the plurality of TCI states being associated with different physical cell IDs (PCIs). The one embodiment of the present disclosure makes it possible to suitably carry out a TCI state instruction.

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) 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, it is being considered that user terminals (terminals, user terminals, User Equipment (UE)) will control transmission and reception processing based on information about quasi-co-location (QCL) (QCL assumptions / Transmission Configuration Indication (TCI) states / spatial relationships).

[0006] It is being considered to apply the set / activated / indicated TCI state to multiple types of signals (channels / RS). However, there are cases where the method for indicating the TCI state is unclear. If the method for indicating the TCI state is unclear, it may lead to a deterioration in communication quality, a decrease in throughput, etc.

[0007] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately indicate the TCI state.

[0008] A terminal according to one aspect of the present disclosure includes a receiving unit that receives instruction information of a plurality of transmission configuration indication (TCI) states to be applied to a plurality of signals, and a control unit that applies the plurality of TCI states to signals transmitted and received from a plurality of transmission / reception points (TRPs) based on the instruction information, each of the plurality of TCI states being a TCI state applied to both a downlink (DL) signal and an uplink (UL) signal, or a TCI state applied to a DL signal and a TCI state applied to a UL signal, and each of the plurality of TCI states being associated with a different physical cell ID (PCI).

[0009] According to one aspect of the present disclosure, the TCI status can be appropriately indicated.

[0010] Figures 1A and 1B are diagrams illustrating an example of a common beam. Figures 2A and 2B are diagrams illustrating examples of single DCI-based multi-TRP transmission and multi-DCI-based multi-TRP transmission, respectively. Figures 3A and 3B are diagrams illustrating an example of a TCI field in a DCI. Figures 4A and 4B are diagrams illustrating an example of setting / indicating a joint TCI state in a single DCI-based multi-TRP. Figures 5A and 5B are diagrams illustrating an example of setting / indicating a separate TCI state in a single DCI-based multi-TRP. Figures 6A and 6B are diagrams illustrating an example of setting / indicating a joint TCI state corresponding to a first value of a CORESET pool index in a multi-DCI-based multi-TRP. Figures 7A and 7B are diagrams illustrating an example of setting / indicating a joint TCI state corresponding to a second value of a CORESET pool index in a multi-DCI-based multi-TRP. Figures 8A and 8B are diagrams illustrating an example of inter-cell mobility. Figure 9 is a diagram showing TCI states corresponding to CSI-RS related to SSBs of non-serving cells. Figure 10 is a diagram showing an example of the relationship between beam reporting and regeneration indexes. Figure 11 is a diagram showing an example of an inter-cell scenario in multi-DCI-based multi-TRP. Figure 12A is a diagram showing the maximum number of additional PCIs for Case 1. Figure 12B is a diagram showing the maximum number of additional PCIs for Case 2. Figure 13 is a diagram showing an example of overlapping UL transmissions between SSBs from a serving cell and SSBs from cells with additional PCIs. Figure 14A is a diagram showing TCI states in Rel. 15 and configured DL / joint TCI states in Rel. 17. Figure 14B is a diagram showing indicated DL / joint TCI states. Figures 15A and 15B are diagrams showing examples of TCI state configuration and indication in the first embodiment. Figure 16A is a diagram showing a first example of TCI state configuration and indication in the second embodiment. Fig. 16B is a diagram showing an example of correspondence between TCI code points and active TCI states. Fig. 17A is a diagram showing a second example of setting and indicating TCI states in the second embodiment. Fig. 17B is a diagram showing an example of correspondence between TCI code points and active TCI states.Fig. 18 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. Fig. 19 is a diagram showing an example of a configuration of a base station according to an embodiment. Fig. 20 is a diagram showing an example of a configuration of a user terminal according to an embodiment. Fig. 21 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. Fig. 22 is a diagram showing 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 (QCL types) of QCL 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. The parameters (which may be referred to as QCL parameters) are as follows: QCL type A (QCL-A): Doppler shift, Doppler spread, mean delay, and delay spread QCL type B (QCL-B): Doppler shift and Doppler spread QCL type C (QCL-C): Doppler shift and mean delay QCL type D (QCL-D): Spatial reception parameters.

[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 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)).

[0021] 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).

[0022] 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.

[0023] 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.

[0024] For the PDCCH and PDSCH, the QCL Type A RS is always configured, and the QCL Type D RS may be configured additionally. Since it is difficult to estimate Doppler shift, delay, etc. by one-shot reception of the DMRS, the QCL Type A RS is used to improve the accuracy of channel estimation. The QCL Type D RS is used to determine the receiving beam when receiving the DMRS.

[0025] For example, TRS1-1, 1-2, 1-3, and 1-4 are transmitted, and TRS1-1 is notified as a QCL type C / D RS depending on the TCI status of the PDSCH. By notifying the TCI status, the UE can use information obtained from past periodic reception / measurement results of TRS1-1 for reception / channel estimation of the DMRS for the PDSCH. In this case, the QCL source of the PDSCH is TRS1-1, and the QCL target is the DMRS for the PDSCH.

[0026] (Default TCI State / Default Spatial Relationship / Default PL-RS) In Rel. 16, PDSCH may be scheduled with a DCI having a TCI field. The TCI state for the PDSCH is indicated by the TCI field. The TCI field of DCI format 1-1 is 3 bits, and the TCI field of DCI format 1-2 is a maximum of 3 bits.

[0027] In RRC connected mode, if the first TCI information element in DCI (higher layer parameter tci-PresentInDCI) is set to "enabled" for a CORESET scheduling a PDSCH, the UE assumes that the TCI field is present in DCI format 1_1 of the PDCCH transmitted in this CORESET.

[0028] Furthermore, if the TCI information element in the second DCI (higher layer parameter tci-PresentInDCI-1-2) for the CORESET scheduling the PDSCH is configured in the UE, the UE assumes that a TCI field with the DCI field size indicated in the TCI information element in the second DCI is present in DCI format 1_2 of the PDSCH transmitted in the CORESET.

[0029] Also, in Rel. 16, PDSCH may be scheduled by DCI without a TCI field. The DCI format of this DCI may be DCI format 1_0 or DCI format 1_1 / 1_2 in the case where the TCI information element in the DCI (the higher layer parameter tci-PresentInDCI or tci-PresentInDCI-1-2) is not configured (enabled). When PDSCH is scheduled by DCI without a TCI field, if the time offset between the reception of the DL DCI (the DCI that schedules the PDSCH (scheduling DCI)) and the corresponding PDSCH (the PDSCH scheduled by this DCI) is equal to or greater than a threshold (timeDurationForQCL), the UE assumes that the TCI state or QCL assumption for the PDSCH is the same as the TCI state or QCL assumption (default TCI state) of CORESET (e.g., the scheduling DCI).

[0030] In RRC connected mode, both when the TCI information element in DCI (higher layer parameters tci-PresentInDCI and tci-PresentInDCI-1-2) is set to "enabled" and when the TCI information element in DCI is not set, if the time offset between the reception of a DL DCI (a DCI scheduling a PDSCH) and the corresponding PDSCH (the PDSCH scheduled by that DCI) is less than a threshold (timeDurationForQCL) (applicability condition, first condition), in the case of non-cross-carrier scheduling, the TCI state of the PDSCH (default TCI state) may be the TCI state of the lowest CORESET ID in the latest slot in the active DL BWP of that CC (for a particular UL signal). Otherwise, the TCI state of the PDSCH (default TCI state) may be the TCI state of the lowest TCI state ID of the PDSCH in the active DL BWP of the scheduled CC.

[0031] In Rel. 15, separate MAC CEs are required for the activation / deactivation of the PUCCH spatial relation and for the activation / deactivation of the SRS spatial relation. The PUSCH spatial relation follows the SRS spatial relation.

[0032] In Rel. 16, at least one of the MAC CE for activation / deactivation of the PUCCH spatial relationship and the MAC CE for activation / deactivation of the SRS spatial relationship may not be used.

[0033] If neither the spatial relationship nor the PL-RS for the PUCCH is configured in FR2 (applicable condition, second condition), default assumptions of the spatial relationship and the PL-RS for the PUCCH (default spatial relationship and default PL-RS) are applied. If neither the spatial relationship nor the PL-RS for the SRS (SRS resource for the SRS or SRS resource corresponding to the SRI in DCI format 0_1 ​​that schedules the PUSCH) is configured in FR2 (applicable condition, second condition), default assumptions of the spatial relationship and the PL-RS for the PUSCH and SRS scheduled by DCI format 0_1 ​​(default spatial relationship and default PL-RS) are applied.

[0034] If a CORESET is configured in the active DL BWP on that CC (if applicable), the default spatial relationship and default PL-RS may be the TCI state or QCL assumption of the CORESET with the lowest CORESET ID in that active DL BWP. If a CORESET is not configured in the active DL BWP on that CC, the default spatial relationship and default PL-RS may be the active TCI state with the lowest PDSCH ID in that active DL BWP.

[0035] In Rel. 15, the spatial relationship of the PUCCH scheduled by DCI format 0_0 follows the spatial relationship of the PUCCH resource with the lowest PUCCH resource ID among the active spatial relationships of the PUCCHs on the same CC. The network needs to update the PUCCH spatial relationship on all SCells, even if no PUCCH is transmitted on the SCell.

[0036] In Rel. 16, PUCCH configuration is not required for a PUSCH scheduled by DCI format 0_0. If there is no active PUCCH spatial relationship or no PUCCH resource on the active UL BWP in the CC for a PUSCH scheduled by DCI format 0_0 (applicable condition, second condition), the default spatial relationship and default PL-RS are applied to the PUSCH.

[0037] The application conditions for the default spatial relationship / default PL-RS for SRS may include a default beam path loss enable information element for SRS (upper layer parameter enableDefaultBeamPlForSRS) being set to valid. The application conditions for the default spatial relationship / default PL-RS for PUCCH may include a default beam path loss enable information element for PUCCH (upper layer parameter enableDefaultBeamPlForPUCCH) being set to valid. The application conditions for the default spatial relationship / default PL-RS for PUSCH scheduled by DCI format 0_0 may include a default beam path loss enable information element for PUSCH scheduled by DCI format 0_0 (upper layer parameter enableDefaultBeamPlForPUSCH0_0) being set to valid.

[0038] In Rel. 16, if an RRC parameter (a parameter enabling a default beam PL for PUCCH (enableDefaultBeamPL-ForPUCCH), a parameter enabling a default beam PL for PUSCH (enableDefaultBeamPL-ForPUSCH0_0), or a parameter enabling a default beam PL for SRS (enableDefaultBeamPL-ForSRS)) is configured for a UE and a spatial relationship or PL-RS is not configured, the UE applies the default spatial relationship / PL-RS.

[0039] This threshold may also be called time duration for QCL, "timeDurationForQCL", "Threshold", "Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI", "Threshold-Sched-Offset", "beamSwitchTiming", schedule offset threshold, scheduling offset threshold, etc. This threshold may be reported by the UE as UE capability (per subcarrier spacing).

[0040] If the offset (scheduling offset) between the reception of a DL DCI and the corresponding PDSCH is smaller than a threshold timeDurationForQCL, and at least one TCI state configured for the serving cell of the scheduled PDSCH includes "QCL type D", and the UE configures the two default TCI enable information element (enableTwoDefaultTCIStates-r16), and at least one TCI codepoint (the codepoint of the TCI field in the DL DCI) indicates two TCI states, the UE assumes that the PDSCH or the DMRS port of the PDSCH transmission occasion of the serving cell is quasi-colocated with the RS for the QCL parameters associated with the two TCI states corresponding to the lowest codepoints among the TCI codepoints containing two different TCI states (two-default QCL assumption decision rule). The 2 default TCI enable information element indicates that Rel. 16 operation of the 2 default TCI states for the PDSCH is enabled when at least one TCI codepoint is mapped to 2 TCI states.

[0041] As the default TCI state for PDSCH in Rel. 15 / 16, the default TCI state for single TRP, the default TCI state for multi-TRP based on multi-DCI, and the default TCI state for multi-TRP based on single DCI are specified.

[0042] As default TCI states for aperiodic CSI-RS (A (aperiodic)-CSI-RS) in Rel. 15 / 16, the default TCI state for single TRP, the default TCI state for multi-TRP based on multi-DCI, and the default TCI state for multi-TRP based on single DCI are specified.

[0043] In Rel. 15 / 16, the default spatial relationship and default PL-RS for each of PUSCH / PUCCH / SRS are specified.

[0044] (Multi-TRP) In NR, one or more transmission / reception points (TRP) (multi-TRP (MTRP)) 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 using one or more panels.

[0045] Note that multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0046] Multi-TRPs (e.g., TRPs #1 and #2) may be connected by ideal / non-ideal backhauls to exchange information, data, etc. Each TRP of a multi-TRP may transmit a different code word (CW) and a different layer. Non-Coherent Joint Transmission (NCJT) may be used as a form of multi-TRP transmission.

[0047] In the NCJT, for example, TRP#1 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, and TRP#2 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.

[0048] 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.

[0049] 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).

[0050] Multiple PDSCHs from multiple TRPs (which may be referred to as multiple PDSCHs) may be scheduled using one DCI (single DCI (S-DCI), single PDCCH) (single master mode). One DCI may be transmitted from one TRP of a multi-TRP. A configuration using one DCI in a multi-TRP may be referred to as single DCI-based multi-TRP (mTRP / MTRP).

[0051] Multiple PDSCHs from a multi-TRP may be scheduled using multiple DCIs (multiple DCI (M-DCI), multiple PDCCHs (multiple PDCCHs)), respectively (multiple master mode). Multiple DCIs may be transmitted from multiple TRPs, respectively. A configuration that utilizes multiple DCIs in a multi-TRP may be referred to as a multi-DCI-based multi-TRP (mTRP / MTRP).

[0052] It may be assumed that the UE transmits separate CSI reports (CSI reports) for different TRPs. Such CSI feedback may be referred to as separate feedback, separate CSI feedback, etc. In this disclosure, "separate" may be interchangeably read as "independent."

[0053] 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.

[0054] Such a multi-TRP scenario allows for more flexible transmission control using good quality channels.

[0055] In order to support multi-TRP transmission within a cell (with the same cell ID) and between cells (with different cell IDs) based on multiple PDCCHs, in the RRC configuration information for linking multiple pairs of PDCCHs and PDSCHs with multiple TRPs, one control resource set (CORESET) in the PDCCH configuration information (PDCCH-Config) may correspond to one TRP.

[0056] If at least one of the following conditions 1 and 2 is satisfied, the UE may determine that the transmission is a multi-TRP transmission based on the multi-DCI. In this case, the TRP may be replaced with the CORESET pool index. [Condition 1] A CORESET pool index of 1 is set. [Condition 2] Two different values ​​of the CORESET pool index (e.g., 0 and 1) are set.

[0057] If the following condition is met, the UE may determine that it is a multi-TRP based on a single DCI. In this case, two TRPs may be interpreted as two TCI states indicated by the MAC CE / DCI. [Condition] "Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE" is used to indicate one or two TCI states for one codepoint in the TCI field in the DCI.

[0058] The DCI for common beam instruction may be a UE-specific DCI format (e.g., DL DCI format (e.g., 1_1, 1_2), UL DCI format (e.g., 0_1, 0_2)), or may be a UE-group common DCI format.

[0059] (Unified / Common TCI Framework) The unified TCI framework allows UL and DL channels to be controlled by a common framework. Instead of specifying TCI states or spatial relationships for each channel as in Rel. 15, the unified TCI framework may specify a common beam (common TCI state) and apply it to all UL and DL channels, or a common beam for UL may apply to all UL channels and a common beam for DL ​​may apply to all DL channels.

[0060] 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.

[0061] 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).

[0062] 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).

[0063] DCI-based beam management (DCI-level beam indication) may indicate a common beam / unified TCI state from the same TCI pool (joint common TCI pool, joint TCI pool, set) for both UL and DL. X (>1) TCI states may be activated by the MAC CE. The DCI may select one from the X active TCI states. The selected TCI state may apply to both UL and DL channels / RS.

[0064] 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.

[0065] 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.

[0066] The case where M>1 / N>1 may indicate at least one of TCI status indications for multiple TRPs and multiple TCI status indications for inter-band CA.

[0067] 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.

[0068] In the example of FIG. 1A, 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.

[0069] 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).

[0070] 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."

[0071] 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.

[0072] 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.

[0073] The existing DCI formats 1_1 / 1_2 may be used to indicate the common TCI state.

[0074] The DCI format indicating the TCI status may be a specific DCI format, for example, DCI format 1_1 / 1_2 (defined in Rel. 15 / 16 / 17).

[0075] The DCI format (DCI format 1_1 / 1_2) indicating the TCI state may be a DCI format without a DL assignment. In the present disclosure, the DCI format may be interchangeably referred to as a DCI format without a DL assignment, a DCI format (DCI format 1_1 / 1_2) that does not schedule a PDSCH, a DCI format (DCI format 1_1 / 1_2) that does not include one or more specific fields, or a DCI format (DCI format 1_1 / 1_2) in which one or more specific fields are set to fixed values.

[0076] For a DCI format without DL assignment (a DCI format that does not include one or more specific fields), the specific fields may be fields other than the TCI field, the DCI format identifier field, the carrier indicator field, the bandwidth portion (BWP) indicator field, the Time Domain Resource Assignment (TDRA) field, the Downlink Assignment Index (DAI) field (if configured), the Transmission Power Control (TPC) command field (for the scheduled PUCCH), the PUCCH resource indicator field, and the PDSCH-to-HARQ feedback timing indicator field (if present). The specific fields may be set as reserved fields or ignored.

[0077] For DCI formats without DL assignment (DCI formats in which one or more specific fields are set to fixed values), the specific fields may be a Redundancy Version (RV) field, a Modulation and Coding Scheme (MCS) field, a New Data Indicator field, and a Frequency Domain Resource Assignment (FDRA) field.

[0078] The RV field may be set to all ones. The MCS field may be set to all ones. The NDI field may be set to zero. The FDRA field of type 0 may be set to all zeros. The FDRA field of type 1 may be set to all ones. The FDRA field for dynamic switch (higher layer parameter dynamicSwitch) may be set to all zeros.

[0079] A common TCI framework may have separate TCI states for DL ​​and UL.

[0080] Unified TCI State for Multi-TRP Single DCI based multi-TRP may be assumed to be supported when multi-TRP utilizes an ideal backhaul (see FIG. 2A).

[0081] In this case, one beam instruction DCI may indicate multiple TCI states for each TRP, which may be, for example, up to two joint TCI states or up to four separate DL / UL TCI states (two DL TCI states and two UL TCI states).

[0082] In the present disclosure, one TCI state may mean one joint (DL / UL) TCI state, or may mean at least one of one DL (separate) TCI state and one UL (separate) TCI state.

[0083] Multi-PDCCH (DCI) may be assumed to be supported when multi-TRPs utilize ideal / non-ideal backhaul (see FIG. 2B).

[0084] In this case, one DCI associated with one TRP (CORESET pool index) may indicate the TCI state corresponding to the TRP.

[0085] The ideal backhaul may be called DMRS port group type 1, reference signal related group type 1, antenna port group type 1, CORESET pool type 1, etc. The non-ideal backhaul may be called DMRS port group type 2, reference signal related group type 2, antenna port group type 2, CORESET pool type 2, etc. The names are not limited to these.

[0086] The field indicating the TCI status (TCI field) included in the DCI may follow at least one of the following options 0-1 and 0-2.

[0087] [Option 0-1] The TCI field defined up to Rel. 15 / 16 may be reused (see Figure 3A). As shown in Figure 3A, one TCI field may be included in the DCI. The number of bits in the TCI field may be a specific number (e.g., 3).

[0088] [Option 0-2] The TCI field defined in Rel. 15 / 16 may be extended (see FIG. 3B). For example, the DCI may include multiple TCI fields (e.g., two). The number of bits in each TCI field may be a specific number (e.g., three).

[0089] In options 0-2, for DCIs without DL assignments, no DCI overhead is added, while for DCIs with DL assignments, DCI overhead is added.

[0090] For single DCI-based multi-TRP, in the case of joint TCI states, the DL / UL (joint) TCI state may be activated for the UE using MAC CE, and the UE may then be indicated the first DL / UL (joint) TCI state and the second DL / UL (joint) TCI state using DCI (beam indication) (see Figure 4A).

[0091] The TCI code point indicated by the beam indication may correspond to one or more (two) TCI states (first joint TCI state / second joint TCI state) (see FIG. 4B).

[0092] In the example shown in Figure 4B, all TCI code points corresponding to active TCI states correspond to two TCI states, but an association may be used in which at least one TCI code point corresponding to an active TCI state corresponds to two TCI states. By using such an association, it is possible to dynamically switch between single TRP and multi-TRP.

[0093] For single DCI-based multi-TRP, in the case of separate TCI states, the DL (separate) TCI state and the UL (separate) TCI state may be activated for the UE using MAC CE, and then the UE may be indicated the first DL (separate) TCI state and the first UL (separate) TCI state and the second DL (separate) TCI state and the second UL (separate) TCI state using DCI (beam indication) (see Figure 5A).

[0094] The TCI code point indicated by the beam indication may correspond to one or more (two) TCI states (first separate (DL / UL) TCI state / second separate (DL / UL) TCI state) (see Figure 5B).

[0095] In the example shown in Figure 5B, all TCI code points corresponding to the active TCI state correspond to two TCI states (first separate (DL / UL) TCI state / second separate (DL / UL) TCI state), but an association may be used in which at least one TCI code point corresponding to the active TCI state corresponds to two TCI states. By using such an association, it is possible to dynamically switch between single TRP and multi-TRP.

[0096] Note that, in FIG. 5A , an example is shown in which separate TCI states are activated for the DL TCI state and the UL TCI state with respect to the TCI state activated by the MAC CE. However, even in the case of separate TCI states, the activated DL TCI state and the UL TCI state may include a common TCI state.

[0097] For multi-DCI based multi-TRP, the TCI state may be configured by RRC, activated by MAC CE, and / or indicated by DCI per CORESET pool index.

[0098] For multi-DCI based multi-TRP, in case of joint TCI states, the TCI state may be configured by RRC, activated by MAC CE, and indicated by DCI to the UE for a CORESET pool index of a first value (e.g., 0) (see Figure 6A). The indicated TCI state corresponding to the CORESET pool index of the first value may be referred to as the first TCI state.

[0099] The TCI code point indicated by the beam indication may correspond to one TCI state (first joint TCI state) (see FIG. 6B).

[0100] For multi-DCI based multi-TRP, in case of joint TCI state, the TCI state may be configured by RRC, activated by MAC CE, and indicated by DCI to the UE for a CORESET pool index of a second value (e.g., 1) (see Figure 7A). The indicated TCI state corresponding to the CORESET pool index of the second value may be referred to as the second TCI state.

[0101] The TCI code point indicated by the beam indication may correspond to one TCI state (second joint TCI state) (see FIG. 7B).

[0102] When the DCIs corresponding to each CORESET pool index indicate the same TCI state (TCI state ID) (for example, when TCI state #7 corresponding to TCI codepoint "111" in Figures 6B and 7B is indicated), the UE may determine that one TCI state is indicated. In this case, the UE may operate using a single TRP.

[0103] Although the above multi-DCI based multi-TRP has been described as an example using a joint TCI state, it can also be applied appropriately to cases using a separate TCI state.

[0104] In this disclosure, the terms indicated TCI state, Rel. 17 TCI state, common TCI state, and unified TCI state may be interchangeable. In this disclosure, the terms common TCI state, Rel. 17 TCI state, and Rel. 18 TCI state that apply to channels / signals that utilize multiple TRPs may be interchangeable.

[0105] The UE may apply the indicated TCI state to a particular channel / signal.

[0106] The specific channel / signal may be a UE-specific (dedicated) DL channel / signal, which may be a UE-specific PDCCH / PDSCH / CSI-RS (e.g., aperiodic (A-) CSI-RS).

[0107] The specific channel / signal may be a specific UL channel / signal, which may be at least one of a DCI-indicated (dynamic grant-indicated) PUSCH, a configured grant PUSCH, multiple (all) specific PUCCHs (resources), and an SRS (e.g., an aperiodic (A-) SRS).

[0108] One or more (eg, two) indicated TCI states may be indicated based on the methods described above.

[0109] Each embodiment of the present disclosure may be applied to a single-TRP PDSCH.

[0110] The PDSCH of a single TRP may be scheduled with a specific DCI (DCI format). The specific DCI format may be, for example, DCI format 1_0 (or a DCI format that does not include a TCI field). The specific DCI format may be DCI format 1_1 / 1_2. The specific DCI format may indicate one TCI state.

[0111] The QCL assumption for the PDSCH of a single TRP may be the default TCI state, which may be one TCI state (in any DCI format).

[0112] The UE may not be configured for multi-TRP repeated transmission, and the single-TRP PDSCH may be scheduled as a PDSCH with single layer MIMO.

[0113] The single-TRP PDSCH may be the PDSCH when the UE is not configured with multi-TRP (e.g., CORESET pool index).

[0114] The PDSCH of a single TRP may be a PDSCH scheduled with a CORESET of at least the CSS. The PDSCH of a single TRP may be a PDSCH scheduled with a CORESET of only the CSS (or a CSS excluding the Type 3 CSS).

[0115] Each embodiment of the present disclosure may be applied to a multi-TRP PDSCH.

[0116] The PDSCH of a single TRP may be scheduled with a specific DCI (DCI format), which may be DCI format 1_1 / 1-2, and which may indicate two TCI states.

[0117] The QCL assumption for the multi-TRP PDSCH may be the default TCI state, which may be two TCI states (in any DCI format).

[0118] The UE may not be configured for multi-TRP repeated transmission, and the multi-TRP PDSCH may be scheduled as a PDSCH with multi-layer MIMO.

[0119] The multi-TRP PDSCH may be a PDSCH when the UE is configured for multi-TRP repetition transmission, and may then be scheduled as a PDSCH with repetition (using TDM / FDM / SDM).

[0120] The multi-TRP PDSCH may be a PDSCH when the UE is configured with SFN scheme A / B. The multi-TRP PDSCH may be a PDSCH with multiple TCI states.

[0121] Each embodiment of the present disclosure may be applied to a single-TRP PDCCH.

[0122] The PDCCH of a single TRP may be a PDCCH associated with a CORESET in which the SFN scheme A / B is not configured.

[0123] The PDCCH of a single TRP may be a PDCCH associated with a CORESET in which repetitive transmission (of two linked SSs) is not configured.

[0124] Each embodiment of the present disclosure may be applied to a multi-TRP PDCCH.

[0125] The multi-TRP PDCCH may be a PDCCH associated with a CORESET in which SFN scheme A / B is configured.

[0126] Each embodiment of the present disclosure may be applied to a single-TRP PUSCH / PUCCH.

[0127] The PUSCH / PUCCH of a single TRP may be a PUSCH / PUCCH in which repeated transmission of a multi-TRP is not configured.

[0128] Each embodiment of the present disclosure may be applied to a multi-TRP PUSCH / PUCCH.

[0129] The PUSCH / PUCCH of the multi-TRP may be a PUSCH / PUCCH for which repeated transmission of the multi-TRP is set.

[0130] Each embodiment of the present disclosure may be applied to single / multi-TRP CSI-RS / SRS.

[0131] (Inter-cell mobility / multi-TRP inter-cell operation) In NR, it is considered that one or more transmission / reception points (TRPs) (multi-TRPs (MTRPs)) perform DL transmission to a UE. It is also considered that a UE performs UL transmission to one or more TRPs.

[0132] During inter-cell mobility (e.g., L1 / L2 inter cell mobility), a UE may receive channels / signals from multiple cells / TRPs.

[0133] FIG. 8A illustrates an example of inter-cell mobility (e.g., single-TRP inter-cell mobility) including a non-serving cell. A UE may be configured with one TRP (or a single TRP) in each cell. Here, the UE receives channels / signals from the base station / TRP of cell #1 (PCI #1), which is the serving cell, and the base station / TRP of cell #3 (PCI #3), which is not the serving cell. For example, this corresponds to a case where the UE switches / switches from cell #1 to cell #3 (e.g., a fast cell switch).

[0134] In this case, the selection of the port (e.g., antenna port) / TRP may be performed dynamically or based on the TCI status indicated or updated by the DCI / MAC CE. Here, it is shown that different Physical Cell Identifier (PCI) configurations are supported for cell #1 and cell #3.

[0135] Such inter-cell mobility (e.g., L1 / L2 inter-cell mobility) allows a UE to transmit and receive UL / DL channels / RS to and from a cell having a PCI different from that of the serving cell. For example, if the RSRP of a non-serving cell is higher than that of the serving cell, the UE can transmit and receive UL / DL channels / RS to and from the non-serving cell without handover.

[0136] Figure 8B shows an example of a multi-TRP scenario. Similar to Figure 8A, the UE receives channels / signals from the base station / TRP of cell #1 (PCI #1), which is the serving cell, and the base station / TRP of cell #3 (PCI #3), which is not the serving cell. In Figure 8B, the multi-DCI-based multi-TRP using the NCJT described above is applied to the TRP of PCI #1 and the TRP of PCI #3.

[0137] Regarding beam indication, the TCI states in Figures 8A and 8B may be the TCI states of Rel. 15 / 16 or the unified TCI states of Rel. 17 and later. The beam management / reporting (e.g., L1-RSRP reporting of non-serving cells) in Figures 8A and 8B may be common.

[0138] Figure 9 shows the TCI states corresponding to CSI-RS related to SSBs of non-serving cells. PCIs #1 and #3 in Figure 9 correspond to PCIs #1 and #3 in Figure 8A. When inter-cell mobility shown in Figure 8A is performed, the UE switches the TCI state used for DL ​​reception from TCI state #1 to TCI state #2.

[0139] <Beam Report and Rebuild Index> Figure 10 is a diagram showing an example of the relationship between a beam report and a rebuild index. As shown in Figure 10, a beam report (CSI report) of a non-serving cell includes an RSRP value and a CRI or SSBRI. The CRI or SSBRI is associated with a rebuild index (ID for PCI).

[0140] The rebuild index is a newly created index based on the PCI and is associated with at least a part of the PCI. The rebuild index is configured in the UE by the RRC and may be assigned a value up to 7 corresponding to an additional PCI (PCI of a non-serving cell). When the rebuild index (ID) is 0, it may represent the serving cell (PCI of the serving cell). The rebuild index can be represented with fewer bits than the PCI, thereby reducing communication overhead.

[0141] <Multi-TRP Inter-Cell Scenario> The following describes an inter-cell scenario (inter-cell mobility) in a multi-DCI-based multi-TRP scenario. When multi-TRP is applied, a coresetPoolIndex is configured. As shown in Figure 11, an additional PCI is associated with an activated TCI state (SSB as QCL source RS) corresponding to PDSCH / PDCCH. One PCI is associated with an activated TCI state corresponding to one coresetPoolIndex.

[0142] Also, as shown in Figure 11, the PCI of the serving cell is always associated with an activated TCI state, and the additional PCI (SSB corresponding to the additional PCI) is associated with only one active TCI state. Rate matching may be performed for the PDCCH / PDSCH corresponding to the serving cell around the SSB associated with the PCI of the serving cell. Also, rate matching may be performed for the PDCCH / PDSCH corresponding to the additional PCI around the SSB associated with the additional PCI. Also, the shared search space (CSS) of type 0 / 0A / 1 / 2 may not be monitored.

[0143] Note that the serving cell and the cell with the additional PCI may have the same center frequency, Subcarrier Spacing (SCS), and System Frame Number (SFN) offset. The number of additional PCIs configured by RRC may be up to seven. The UE may also report UE capabilities indicating the maximum number X of additional PCIs.

[0144] The following two cases are possible for X, which is the maximum number of additional PCIs configured as UE capabilities. Note that Case 1 and Case 2 do not have to be enabled at the same time. [Case 1] X indicates the maximum number of additional PCIs whose corresponding "position and period of the SSB time field" are the same as those of the serving cell (this X is designated as X1). [Case 2] X indicates the maximum number of additional PCIs whose corresponding "position and period of the SSB time field" are partially or entirely different from those of the serving cell (this X is designated as X2).

[0145] Fig. 12A is a diagram showing the maximum number of additional PCIs in Case 1. In Fig. 12A, X1 is 4. Fig. 12B is a diagram showing the maximum number of additional PCIs in Case 2. In Fig. 12B, X2 is 8.

[0146] 13 illustrates an example of an overlap of an UL transmission with an SSB from a serving cell or an SSB from a cell with an additional PCI associated with an active TCI state. The UE may cancel an UL transmission if the SSB from the serving cell or an SSB from a cell with an additional PCI associated with an active TCI state overlaps in time with the UL transmission.

[0147] In the QCL-related rules being considered for adoption in Rel. 17, for DMRS of PDCCH / PDSCH, the configured DL / joint TCI state is specified as "DLorJointTCIState" except for the indicated "DLorJointTCIState". The indicated TCI state applies to multiple UL / DL channels / RSs. The configured TCI state applies to only one channel / RS.

[0148] Figure 14A shows the TCI states in Rel. 15 and the configured DL / joint TCI states in Rel. 17. Figure 14B shows the indicated DL / joint TCI states. Figure 14B differs from Figure 14A in that the relationship in the third row is not supported. "Configured" may mean configured by higher layer (RRC) signaling. "Indicated" may mean indicated by DCI.

[0149] (Antenna Port Quasi Co-location (QCL)) In the section on antenna port QCL in Rel. 17, it is being considered to specify the Tracking Reference Signal (TRS) as follows: Note that NZP-CSI-RS-ResourceSet is an upper layer parameter for the non-zero power CSI-RS resource set.

[0150] <TRS> For periodic CSI-RS resources in the NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info, the UE expects the TCI state to indicate one of the following QCL types (1) or (2): (1) "type C" corresponding to an SS / PBCH block and, if applicable, "type D" corresponding to the same SS / PBCH block, or (2) "type C" corresponding to an SS / PBCH block and, if applicable, "type D" corresponding to the CSI-RS in the NZP-CSI-RS-ResourceSet configured with the higher layer parameter repetition.

[0151] In the antenna port QCL of Rel. 17, it is being considered to specify the CSI-RS corresponding to repeated transmission as follows.

[0152] <CSI-RS Corresponding to repetition> For CSI-RS resources in the NZP-CSI-RS-ResourceSet configured with the higher layer parameter repetition, the UE expects the TCI state to indicate one of the following QCL types (1) to (3): (1) "type A" corresponding to the CSI-RS resources in the NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info and, if applicable, "type D" corresponding to the same CSI-RS resources; (2) "type A" corresponding to the CSI-RS resources in the NZP-CSI-RS-ResourceSet configured with the higher layer parameter trs-Info and "type D" corresponding to the CSI-RS resources in the NZP-CSI-RS-ResourceSet configured with the higher layer parameter repetition. (3) "type C" corresponding to an SS / PBCH block, and "type D" corresponding to the same SS / PBCH block, if applicable. This reference RS may additionally be an SS / PBCH block with a PCI different from that of the serving cell. The UE may assume that the center frequency, SCS, and SFN offset are the same for an SS / PBCH block from the serving cell and an SS / PBCH block with a PCI different from that of the serving cell.

[0153] (NZP CSI-RS) It is being considered to specify the following in the NZP CSI-RS section of Rel. 17: This section does not prohibit a CSI-RS (including a TRS) from being further associated with an SSB that has an additional PCI.

[0154] The parameters for the UE to assume non-zero transmit power for CSI-RS resources, which are configured via the higher layer parameters NZP-CSI-RS-Resource, CSI-ResourceConfig, and NZP-CSI-RS-ResourceSet for each CSI-RS resource configuration, include, for example, the following (1) qcl-InfoPeriodicCSI-RS. (1) qcl-InfoPeriodicCSI-RS includes a reference to a TCI state indicating the QCL source RS(s) and the QCL type. If the TCI state is configured with a reference to an RS with the QCL type set to Type D, the RS may be an SS / PBCH block located in the same or a different CC / DL BWP, or a CSI-RS resource configured as periodic (periodic) located in the same or a different CC / DL BWP. The reference RS may additionally be an SS / PBCH block associated with a PCI different from the PCI of the serving cell.

[0155] (Analysis) As described above, in future wireless communication systems, it is being considered that a terminal will control transmission and reception processing based on information related to QCL (QCL assumption / Transmission Configuration Indication (TCI) state / spatial relationship). It is being considered that the configured / activated / instructed TCI state will be applied to multiple types of signals (channels / RS). Also, as described above, inter-cell mobility / multi-TRP inter-cell operation is being considered in future wireless communication systems.

[0156] However, there are cases where the method for indicating the TCI state is unclear. For example, the relationship between the TCI state applied to multiple types of signals (channels / RS) and the physical cell ID of the serving cell or non-serving cell is unclear. If the method for indicating the TCI state is unclear, it may lead to a deterioration in communication quality, a deterioration in throughput, etc.

[0157] Therefore, the present inventors have conceived a method for appropriately indicating the TCI state.

[0158] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0159] 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."

[0160] In the present disclosure, terms such as 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.

[0161] 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.

[0162] In the present disclosure, higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like, or a combination thereof.

[0163] 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.

[0164] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0165] In the present disclosure, the terms index, identifier (ID), indicator, resource ID, etc. may be interchangeable. In the present disclosure, the terms sequence, list, set, group, cluster, subset, etc. may be interchangeable.

[0166] In the present disclosure, the terms panel, UE panel, panel group, beam, beam group, precoder, Uplink (UL) transmitting entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relation, SRS Resource Indicator (SRI), Control Resource Set (CORESET), Physical Downlink Shared Channel (PDSCH), Codeword (CW), Transport Block (TB), Reference Signal (RS), antenna port (e.g., Demodulation Reference Signal (DMRS) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relation group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) group, PUCCH resource group), resource (e.g., reference signal resource, SRS resource), resource set (e.g., reference signal resource set), CORESET pool, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, Quasi-Co-Location (QCL), QCL assumption, etc. may be read as interchangeable.

[0167] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interchangeable. The "spatial relationship information" may be interchangeable with "set of spatial relationship information," "one or more pieces of spatial relationship information," etc. The TCI state and the TCI may be interchangeable with each other.

[0168] In the present disclosure, the terms drop, abort, cancel, puncture, rate match, postpone, etc. may be read interchangeably.

[0169] In the present disclosure, the terms common beam, common TCI, common TCI state, Rel. 17 TCI state, TCI state for Rel. 17 or later, unified TCI, unified TCI state, TCI state applicable to multiple types of channels / RS, TCI state applied to multiple (multiple types) of channels / RS, TCI state applicable to multiple types of channels / RS, TCI state for multiple types of signals, TCI state for multiple types of channels / RS, TCI state, unified TCI state, UL and DL TCI state for joint TCI indication, UL-only TCI state for separate TCI indication, DL-only TCI state for separate TCI indication, joint TCI state for DL ​​and UL, and separate TCI state for each of DL and UL may be interpreted as interchangeable.

[0170] In the present disclosure, the terms TCI states of Rel. 15 / 16, TCI states / spatial relationships that apply only to specific channels / RSs, and TCI states / spatial relationships that apply to one type of channel / RS may be interpreted interchangeably.

[0171] In the present disclosure, the terms multiple TCI states configured by an RRC IE, multiple TCI states activated by a MAC CE, information regarding one or more TCI states, TCI state configuration, TCI state pool, active TCI state pool, common TCI state pool, unified TCI state pool, TCI state list, unified TCI state list, joint TCI state pool, separate TCI state pool, separate DL / UL TCI state pool, DL TCI state pool, UL TCI state pool, separate DL TCI state pool, and separate UL TCI state pool may be read as interchangeable.

[0172] In the present disclosure, DL TCI, DL only TCI, separate DL only TCI, DL common TCI, DL unified TCI, common TCI, and unified TCI may be interchangeable. In the present disclosure, UL TCI, UL only TCI, separate UL only TCI, UL common TCI, UL unified TCI, common TCI, and unified TCI may be interchangeable.

[0173] In the present disclosure, the channels / RS to which the unified TCI state applies may be PDSCH / PDCCH / CSI-RS / PUSCH / PUCCH / SRS.

[0174] In the present disclosure, the terms CSI-RS, NZP-CSI-RS, periodic (P)-CSI-RS, P-TRS, semi-persistent (SP)-CSI-RS, aperiodic (A)-CSI-RS, TRS, CSI-RS having TRS information (upper layer parameter trs-Info), and NZP CSI-RS resource in an NZP CSI-RS resource set having TRS information may be interchangeable. In the present disclosure, the terms CSI-RS resource, CSI-RS resource set, CSI-RS resource group, and information element (IE) may be interchangeable.

[0175] In the present disclosure, a non-serving cell, a candidate serving cell, a cell having a PCI different from that of the serving cell, and another serving cell having a PCI different from that of the serving cell may be interchangeable terms. A PCI different from that of the serving cell and an additional PCI may be interchangeable terms. A cell and a PCI may be interchangeable terms.

[0176] In the present disclosure, TRS, tracking CSI-RS, CSI-RS having TRS information (upper layer parameter trs-Info), and NZP-CSI-RS resource in an NZP-CSI-RS resource set having TRS information may be read as interchangeable.

[0177] The terms "TCI state," "TCI state or QCL assumption," "QCL assumption," "QCL information," "QCL parameters," "spatial domain receive filter," "UE spatial domain receive filter," "spatial domain filter," "UE receive beam," "DL receive beam," "DL precoding," "DL precoder," "DL-RS," and "RS of QCL type X of TCI state or QCL assumption" may be interchanged. The terms "RS of QCL type X," "DL-RS associated with QCL type X," "DL-RS having QCL type X," "source of DL-RS," "SSB," and "CSI-RS" may be interchanged. X may be, for example, A, B, C, or D.

[0178] In the present disclosure, the QCL source of Y being Z, the QCL relationship between Y and Z, the QCL type X relationship between Y and Z, and the TCI state of Y indicating QCL type X with Z (QCL-typeX with M) may be interchangeable. X may be, for example, A, B, C, or D. Y and Z may be, for example, any of the DM-RS, CSI-RS, TRS, and SSB of the PDSCH / PDCCH. The DM-RS, CSI-RS, TRS, and SSB of the PDSCH / PDCCH may be interchangeable with the TCI state of the DM-RS, the TCI state of the CSI-RS, the TCI state of the TRS, and the TCI state of the SSB, respectively. The SSB and SS / PBCH block may be interchangeable.

[0179] Z corresponding to Y, Z with Y, and Y with Z may be interchangeable. Type X and QCL type X may be interchangeable. X is, for example, A, B, C, or D. An SS / PBCH block having a PCI different from the PCI of the serving cell and an SS / PBCH block of a non-serving cell may be interchangeable.

[0180] The notation Rel. XX in this disclosure may indicate a 3GPP release. XX indicates a release number, but is not limited to the numbers indicated in this disclosure and may be replaced with another release number. For example, Rel. 18 may be replaced with another release number after Rel. 18. The notation Rel. XX may be omitted.

[0181] "Instructed" may be read as "instructed using DCI", and "configured" may be read as "configured using RRC / MAC CE".

[0182] (Wireless Communication Method) <First Embodiment> A unified TCI state for multiple TRPs may be applied to inter-cell operation of multiple TRPs. That is, a UE may receive indication information of multiple transmission configuration indication (TCI) states (unified TCI states) to be applied to multiple signals, and apply the multiple TCI states to signals transmitted and received from multiple TRPs based on the indication information. Each of the multiple TCI states (unified TCI states) may be a TCI state applied to both DL signals and UL signals (joint TCI state), or a TCI state applied to DL signals and a TCI state applied to UL signals (separate TCI state). Each of the multiple TCI states (unified TCI states) may be associated with a different physical cell ID (PCI).

[0183] In Rel. 17, it is considered that only multi-TRP with multi-DCI is supported for inter-cell operation with multi-TRP, and that one CORESETPoolIndex is associated with one PCI (the PCI of the serving cell or an additional PCI).

[0184] The association of CORESETPoolIndex / TCI state with PCI may be indicated by RRC signaling (e.g., ControlResourceSets) / MAC CE / DCI.

[0185] That is, when the number of additional PCIs is configured in the UE, the UE is configured with a unified TCI state in Rel. 17 (DL / joint / UL TCI state or a TCI state in Rel. 18), and N, M > 1 TCI states (DL / joint / UL TCI state > 1) are indicated, one indicated TCI state may be associated with one PCI, and another indicated TCI state may be associated with another PCI.

[0186] The TCI state of the DMRS of the PDCCH / PDSCH is set to a CSI-RS / TRS of QCL type A / D as the QCL source RS. The TCI state of the CSI-RS / TRS may be set to an SSB / CSI-RS-TRS of QCL type C / D as the QCL source RS. The SSB may be associated with a PCI different from the PCI of the serving cell.

[0187] 15A and 15B are diagrams showing examples of setting and indicating TCI states in the first embodiment. The correspondence between TCI code points and TCI states is the same as in FIGS. 6B and 7B, and therefore omitted (FIG. 6B corresponds to FIG. 15A, and FIG. 7B corresponds to FIG. 15B). As shown in FIG. 15A, CORESETPoolIndex=0 and the 1st DL / UL TCI state correspond to PCI #1, and CORESETPoolIndex=1 and the 2nd DL / UL TCI state correspond to PCI #2. In other words, each TCI state corresponds to (is associated with) a different PCI.

[0188] A QCL source RS in a first / second joint / DL / UL TCI state may be associated with an SSB of an additional PCI.

[0189] According to this embodiment, both the unified TCI state for multi-TRP and the inter-cell operation of multi-TRP can be performed appropriately.

[0190] Second Embodiment: The unified TCI state may support S-DCI-based multi-TRP inter-cell operation. That is, the UE may receive one DCI (single DCI) that schedules multiple PDSCHs from multiple TRPs. At least one of the unified TCI states (first or second TCI state) may be associated with a PCI (SSBs corresponding to the PCI (SSBs of the non-serving cell)) different from the serving cell.

[0191] One TRP index may be associated with one PCI (either the serving cell PCI or an additional PCI). When the number of additional PCIs (NumberOfAdditionalPCI) is configured in the UE, a unified TCI state (DL / joint / UL TCI state in Rel. 17 or Rel. 18) is configured, and N,M>1 TCI states (DL / joint / UL TCI state>1) are indicated, one indicated TCI state may be associated with one PCI, and another indicated TCI state may be associated with another PCI.

[0192] Figure 16A is a diagram showing a first example of setting and indicating TCI states in the second embodiment. Figure 16B is a diagram showing an example of the correspondence between TCI code points and active TCI states. In Figure 16A, similar to Figure 4A, one DCI indicates a 1st DL / UL (joint) TCI state and a 2nd DL / UL (joint) TCI state. The 1st DL / UL TCI state is associated with PCI #1, and the 2nd DL / UL TCI state is associated with PCI #2.

[0193] Figure 17A is a diagram showing a second example of setting and indicating TCI states in the second embodiment. Figure 17B is a diagram showing an example of the correspondence between TCI code points and active TCI states. In Figure 17A, as in Figure 5A, one DCI indicates the 1st DL TCI state, the 2nd DL TCI state, the 1st UL TCI state, and the 2nd UL TCI state (separate TCI state). The 1st DL TCI state and the 1st UL TCI state are associated with PCI #1, and the 2nd DL TCI state and the 2nd UL TCI state are associated with PCI #2.

[0194] In S-DCI-based multi-TRP inter-cell operation, at least one of the following constraints (1) to (3) may be applied: (1) The UE assumes that the center frequency, SCS, and SFN offset of the SS / PBCH block corresponding to the serving cell are the same as those of the SS / PBCH block corresponding to a PCI different from that of the serving cell. (2) The UE receives two PDSCHs from two TRPs (two cells with different PCIs) within one cyclic prefix (CP) in the time domain. (3) The UE transmits two UL signals for two TRPs (two cells with different PCIs) using the same timing advance (TA).

[0195] According to this embodiment, multiple unified TCI states can be appropriately utilized in S-DCI based multi-TRP inter-cell operation.

[0196] Third Embodiment: A single TRP is applied to Rel. 17 L1 / L2 inter-cell mobility (see, e.g., FIG. 8A). One PCI is associated with only one designated Rel. 17 TCI state.

[0197] A single TRP is applied to Rel. 17 multi-TRP inter-cell operation (see, e.g., FIG. 8B), where one Rel. 15 TCI state is associated with the serving cell PCI and one additional Rel. 15 TCI state is associated with the additional PCI.

[0198] Therefore, both functions of L1 / L2 inter-cell mobility (see, for example, FIG. 8A) and multi-TRP inter-cell operation (see, for example, FIG. 8B) may be configured simultaneously. That is, the UE may receive PDSCH from multiple TRPs using NCJT and select one TRP from the multiple TRPs (or switch serving cells) based on the TCI state indicated or updated by the DCI / MAC CE. In this case, the unified TCI state may be used for beam direction indication. In this case, at least one of the following restrictions (3-1) and (3-2) may apply.

[0199] (3-1) When two TCI states (indicated TCI state or configured TCI state) exist, at least one TCI state is associated with the serving cell PCI. The other TCI state is associated with an additional PCI. This results in the same behavior as in Rel. 17, and the UE can always send and receive signals to and from the serving cell. (3-2) When two TCI states (indicated TCI state or configured TCI state) exist, both TCI states are associated with only the serving cell PCI, only the additional PCI, or both PCIs (the serving cell PCI and the additional PCI).

[0200] According to this embodiment, appropriate transmission and reception can be performed even when both L1 / L2 inter-cell mobility (see, for example, Figure 8A) and multi-TRP inter-cell operation (see, for example, Figure 8B) functions are configured simultaneously.

[0201] <Fourth embodiment> In Rel.17 L1 / L2 inter-cell mobility, a UE can always transmit and receive signals to and from a serving cell. The UE may receive cell-related information (system information, paging, short messages) only from the serving cell. Note that the UE may receive cell-related information from the serving cell when only the TCI states of non-serving cells are active.

[0202] In Rel. 17, strict cell switching is not possible, and a UE can transmit and receive signals to and from a non-serving cell while maintaining connection with the serving cell if the non-serving cell has higher received power. For example, frequent handovers can be inefficient, resulting in sections where communication is not possible. However, by applying L1 / L2 inter-cell mobility and transmitting and receiving signals to and from a cell with higher received power near the cell boundary, communication quality can be improved.

[0203] When switching the serving cell at L1 / L2, the UE may receive a configuration of multiple serving cells via RRC, be instructed (selected) from among the multiple serving cells by MAC CE / DCI, and transmit and receive data with the instructed serving cell. For example, a new MAC CE or a new DCI format / DCI field may be specified for the MAC CE / DCI. Furthermore, the UE may switch the serving cell by switching the TCI state using a mechanism similar to the L1 / L2 inter-cell mobility of Rel. 17.

[0204] [First Aspect] When Rel. 18 mobility functions are configured (e.g., when higher layer parameters (e.g., servingcellconfig) for multiple cells are configured), the UE may be instructed on the TCI status of cells corresponding to at least one PCI using the unified TCI status (joint / DL / UL TCI) of Rel. 17 / 18.

[0205] <<Option 4-1>> The UE may switch the serving cell (servingcellconfig) based on the TCI states of the serving cell and non-serving cells that are specified in advance and the MAC CE / DCI (e.g., a MAC CE dedicated to cell switching, a dedicated DCI format / DCI field).

[0206] The UE may apply two indicated TCI states as the indicated TCI states of the serving cell and the non-serving cell, respectively. For example, of the two indicated TCI states, the UE may apply the first TCI state as the TCI state of the serving cell and the second TCI state as the indicated TCI state of the non-serving cell. This example may be applied to the case of a single TRP.

[0207] In Rel. 18 inter-cell mobility, multi-TRP may be applied and two TCI states may be indicated for each cell. That is, a total of four TCI states may be indicated. Specifically, the UE may be indicated a first TCI state (for the first TRP) for the serving cell, a second TCI state (for the second TRP) for the serving cell, a first TCI state (for the first TRP) for the non-serving cell, and a second TCI state (for the second TRP) for the non-serving cell. Then, when multi-TRP is applied in the non-serving cell, the UE applies two TCI states for the non-serving cell. When single-TRP is applied in the non-serving cell, the UE applies one TCI state (for the first or second TRP) for the non-serving cell. Note that the number of cells does not have to be, for example, two.

[0208] <<Option 4-2>> When the UE switches the serving cell (servingcellconfig) by switching the TCI state (MAC CE / DCI), the UE may switch the serving cell depending on whether the SSB of the QCL source RS of the CSI-RS / TRS of the QCL source RS in the indicated TCI state is associated with the PCI of the serving cell or with another PCI.

[0209] The number of indicated TCI states may be limited to 1 (single-TRP only may be applied) or may be greater than 1 (multi-TRP inter-cell operation may be applied). Also, the number of TCI states corresponding to the PCI of the serving cell may be 1 or greater, and the number of TCI states corresponding to the PCI of the non-serving cell (post-switching serving cell) may be 1. In other words, single-TRP may be applied only when cell switching is performed.

[0210] In Rel. 18, because of the serving cell switching, multi-TRP inter-cell operation (see, e.g., Figure 8B) may not be supported, i.e., multiple indicated TCI states may not be assumed, or multiple TCI states associated with multiple PCIs may not be assumed to be indicated simultaneously.

[0211] Alternatively, in Rel. 18, multi-TRP inter-cell operation may be supported. When multiple TCI states associated with multiple PCIs are simultaneously indicated, the PCI associated with the first (or second) TCI state may be the serving cell, and the PCI associated with the second (or first) TCI state may be the non-serving cell. That is, the UE may switch information about the serving cell to the indicated serving cell.

[0212] [Second Aspect] In Rel.18, a UE may receive cell-related information (system information, paging, short messages) only from the serving cell. Alternatively, when only the TCI state of a non-serving cell is active, the UE may not receive cell-related information (system information, paging, short messages) from the serving cell (the UE does not monitor paging / short messages).

[0213] In Rel. 18, the serving cell is switched by MAC CE / DCI, so if the serving cell is switched from a serving cell at a certain point in time to another cell, the "another cell" becomes the serving cell at the next point in time, and the UE can properly receive information about the cell from the serving cell at this point in time.

[0214] In Rel. 18, at least some of the following constraints (1) to (3) described in the second embodiment may be applied, or all of them may not be applied: (1) The UE assumes that the center frequency, SCS, and SFN offset of the SS / PBCH block corresponding to the serving cell are the same as those of the SS / PBCH block corresponding to a PCI different from that of the serving cell. (2) The UE receives two PDSCHs from two TRPs (two cells with different PCIs) within one cyclic prefix (CP) in the time domain. (3) The UE transmits two UL signals for two TRPs (two cells with different PCIs) using the same timing advance (TA).

[0215] In Rel. 18, the serving cell will be switched, so it is expected that the serving cell in the existing specifications will be switched in L1 / L2. In other words, handover based on MAC CE / DCI will be possible. However, complete handover may not be possible. For example, the TA may not be updated even if the serving cell is switched.

[0216] Here, a new expression for a concept similar to the serving cell may be defined. For the serving cell, new terms such as a connected cell, a providing cell, a serving cell subset, or a sub-serving cell may be used. In other words, the cell switched by the MAC CE / DCI of Rel. 18 may be a cell under the new term.

[0217] Alternatively, when a serving cell in the existing specifications is switched by MAC CE / DCI, the new terminology is unnecessary, and at least some parameters (e.g., TA value, TAG value, etc.) may be common among multiple serving cells. The "among multiple serving cells" may refer to cells related to multiple serving cell configurations (ServingCellConfig) configured by RRC.

[0218] According to this embodiment, it is possible to receive appropriate information regarding the operation of a terminal that complies with Rel.

[0219] <Supplementary Note> At least one of the above-described embodiments may be applied only to UEs that have reported or support a specific UE capability.

[0220] The specific UE capabilities may indicate at least one of the following: Support of specific processes / operations / control / information for at least one of the above embodiments; Support of unified TCI states for multi-TRP inter-cell operation; Number of PCIs that the UE can configure; Number of PCIs associated with an active TCI state; Support of joint TCI and / or DL ​​TCI and / or UL TCI states.

[0221] Furthermore, the 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., cell, band, BWP), 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)).

[0222] 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)).

[0223] Furthermore, at least one of the above-described embodiments may be applied when the UE is configured with specific information related to the above-described embodiments by higher layer signaling.

[0224] If the UE does not support at least one of the specific UE capabilities or is not configured with the specific information, the UE may apply, for example, Rel. 15 / 16 behavior.

[0225] (Supplementary Notes) The following inventions are supplementary notes regarding one embodiment of the present disclosure. [Supplementary Note 1] A terminal comprising: a receiver unit that receives indication information of multiple transmission configuration indication (TCI) states to be applied to multiple signals; and a controller that applies the multiple TCI states to signals using multiple transmission / reception points (TRPs) based on the indication information, respectively, wherein each of the multiple TCI states is a TCI state to be applied to both a downlink (DL) signal and an uplink (UL) signal, or a TCI state to be applied to a DL signal and a TCI state to an UL signal, and each of the multiple TCI states is associated with a different physical cell ID (PCI). [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the receiver unit receives one downlink control information (DCI) that schedules multiple physical downlink shared channels (PDSCHs) from the multiple TRPs, and at least one of the multiple TCI states is associated with a PCI different from a serving cell. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the receiver receives a Physical Downlink Shared Channel (PDSCH) from multiple TRPs using non-coherent joint transmission, and the controller selects one TRP from the multiple TRPs based on a TCI state indicated by at least one of downlink control information (DCI) and a Medium Access Control Element (MAC CE). [Supplementary Note 4] The terminal according to any one of Supplementary Note 1 to Supplementary Note 3, wherein the controller switches the serving cell based on the TCI states of a serving cell and a non-serving cell indicated in advance and at least one of DCI and MAC CE.

[0226] (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.

[0227] 18 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication 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).

[0228] 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.

[0229] 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.

[0230] 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))).

[0231] 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 locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0232] 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).

[0233] 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.

[0234] 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.

[0235] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 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.

[0236] 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.

[0237] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0238] 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).

[0239] 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.

[0240] 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.

[0241] 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.

[0242] 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).

[0243] 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.

[0244] 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.

[0245] 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.

[0246] 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.

[0247] 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.

[0248] 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.

[0249] 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.

[0250] 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.

[0251] 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).

[0252] 19 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.

[0253] 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.

[0254] 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.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] 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.

[0261] 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.

[0262] 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.

[0263] 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.

[0264] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.

[0265] 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.

[0266] 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.

[0267] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0268] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0269] In addition, the transceiver 120 may transmit instruction information of a plurality of transmission configuration indication (TCI) states to be applied to a plurality of signals. Based on the instruction information, the transceiver 120 may apply the plurality of TCI states to signals that the terminal transmits and receives to a plurality of transmission / reception points (TRPs), respectively, and receive the signals.

[0270] The control unit 110 may control transmission and reception of the transceiver unit 120. Each of the plurality of TCI states may be a TCI state applied to both a downlink (DL) signal and an uplink (UL) signal, or a TCI state applied to a DL signal and a TCI state applied to a UL signal. Each of the plurality of TCI states may be associated with a different physical cell ID (PCI).

[0271] (User Terminal) Fig. 20 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.

[0272] 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.

[0273] 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.

[0274] 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.

[0275] 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.

[0276] 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.

[0277] 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.

[0278] 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.

[0279] 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.

[0280] 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.

[0281] 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.

[0282] 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.

[0283] 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.

[0284] 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.

[0285] 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.

[0286] 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.

[0287] 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.

[0288] In addition, the transceiver unit 220 may receive instruction information for multiple transmission configuration indication (TCI) states to be applied to multiple signals. The control unit 210 may apply the multiple TCI states to signals transmitted to and received from multiple transmission / reception points (TRPs) based on the instruction information. Each of the multiple TCI states may be a TCI state applied to both a downlink (DL) signal and an uplink (UL) signal, or a TCI state applied to a DL signal and a TCI state applied to a UL signal. Each of the multiple TCI states may be associated with a different physical cell ID (PCI).

[0289] The transceiver 220 may receive a DCI that schedules multiple Physical Downlink Shared Channels (PDSCHs) from the multiple TRPs, and at least one of the multiple TCI states may be associated with a PCI different from the serving cell.

[0290] The transceiver 220 may receive a physical downlink shared channel (PDSCH) from multiple TRPs using non-coherent joint transmission. The controller 210 may select one TRP from the multiple TRPs based on a TCI state indicated by at least one of downlink control information (DCI) and a medium access control element (MAC CE).

[0291] The control unit 210 may switch the serving cell based on at least one of the TCI states of the serving cell and the non-serving cell that are specified in advance, and the DCI and MAC CE.

[0292] (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.

[0293] 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.

[0294] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 21 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0295] 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.

[0296] 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.

[0297] 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.

[0298] 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.

[0299] 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.

[0300] 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.

[0301] 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.

[0302] 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.

[0303] 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).

[0304] 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.

[0305] 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.

[0306] (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.

[0307] 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.

[0308] 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.

[0309] 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.

[0310] 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.

[0311] 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.

[0312] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of 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.

[0313] 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.

[0314] 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.

[0315] 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.

[0316] 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.

[0317] 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.

[0318] 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.

[0319] 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.

[0320] 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.

[0321] 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.

[0322] 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.

[0323] 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.

[0324] 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."

[0325] 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.

[0326] 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.

[0327] 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.

[0328] 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.

[0329] 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.

[0330] 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.

[0331] 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.

[0332] 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).

[0333] 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).

[0334] 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).

[0335] 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.

[0336] 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.

[0337] 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).

[0338] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0339] 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.

[0340] 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.

[0341] 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.

[0342] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0343] 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.

[0344] 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.

[0345] 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.

[0346] 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.

[0347] 22 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.

[0348] 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.

[0349] 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).

[0350] 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.

[0351] 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.

[0352] 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.

[0353] 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.

[0354] 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.

[0355] 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).

[0356] 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.

[0357] 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)).

[0358] 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.

[0359] 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.

[0360] 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.

[0361] 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.

[0362] 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.

[0363] 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).

[0364] 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."

[0365] 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.

[0366] 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.

[0367] 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.

[0368] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "deciding" some action.

[0369] Furthermore, "judgment (decision)" may be read as "assuming," "expecting," "considering," or the like.

[0370] 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.

[0371] 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."

[0372] 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.

[0373] 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."

[0374] 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.

[0375] 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.

[0376] 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").

[0377] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0378] 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 invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. a receiving unit for receiving information about a plurality of cells and receiving an indication of a transmission configuration indication (TCI) state of a candidate serving cell before a serving cell switch; a control unit that switches the serving cell based on the TCI state and a medium access control element (MAC CE) for cell switching.

2. The terminal of claim 1 , wherein a first TCI state and a second TCI state are indicated for the candidate serving cell.

3. The terminal of claim 1 , further comprising a transmitter configured to report a capability indicating support of at least one of a joint TCI state, a DL TCI state, and a UL TCI state as the TCI state.

4. receiving information about a plurality of cells and receiving an indication of a transmission configuration indication (TCI) status of a candidate serving cell before a serving cell switch; and switching the serving cell based on the TCI state and a medium access control element (MAC CE) for cell switching.

5. a transmitter for transmitting information about a plurality of cells and for transmitting an indication of a transmission configuration indication (TCI) state of a candidate serving cell before a serving cell switch; a control unit that instructs switching of the serving cell based on the TCI state and a medium access control element (MAC CE) for cell switching.

6. A system having a terminal and a base station, The terminal includes a receiving unit configured to receive information about a plurality of cells and receive an indication of a transmission configuration indication (TCI) state of a candidate serving cell before switching the serving cell; a control unit that switches the serving cell based on the TCI state and a medium access control element (MAC CE) for cell switching; the base station includes a transmitter that transmits information about the plurality of cells and transmits the instruction; a control unit that instructs switching of the serving cell based on the TCI state and the MAC CE for cell switching.