Terminals, wireless communication methods, base stations and systems

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

Technical Field

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

Background Art

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) was standardized for the purposes of achieving higher-speed data rates, lower latency, and the like (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) was standardized for the purposes of achieving further increased capacity and advancement over LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Systems succeeding LTE (also referred to as, for example, 5th generation mobile communication system (5G), 5G+(plus), 6th generation mobile communication system (6G), New Radio (NR), and 3GPP Rel. 15 and later versions) are also under study.

Prior Art Literature

Non-Patent Literature

[0004]

Non-Patent Document 1

Summary of the Invention

[0005] In future wireless communication systems, it is being considered that user terminals (user equipment (UE)) will control transmission and reception processing based on information regarding quasi-co-location (QCL) (QCL assumptions / Transmission Configuration Indication (TCI) state / spatial relationships).

[0006] The application of configured / activated / instructed TCI states to multiple types of signals (channel / RS) is being considered. However, there are cases where the method for instructing TCI states is unclear. If the method for instructing TCI states is unclear, it may lead to a decrease in communication quality, throughput, and other problems.

[0007] Therefore, this disclosure relates to a terminal that appropriately provides instructions for the TCI status, and a wireless communication method. 、 base station and system One of the objectives is to provide [this]. [Means for solving the problem]

[0008] A terminal relating to one aspect of this disclosure is a multiple Regarding cells Receive information And, before switching the serving cell, it receives a transmission configuration instruction (TCI) status instruction for the candidate serving cell. A receiving unit and the aforementioned TCI status, Medium Access Control Element (MAC CE) for cell switching, Based on the above Switching serving cells The control unit and have It is characterized by the following. [Effects of the Invention]

[0009] According to one aspect of this disclosure, the TCI status can be appropriately indicated. [Brief explanation of the drawing]

[0010] [Figure 1] Figures 1A and 1B show an example of a common beam. [Figure 2] Figures 2A and 2B show examples of single-DCI-based multi-TRP transmission and multi-DCI-based multi-TRP transmission, respectively. [Figure 3] Figures 3A and 3B show examples of TCI fields within DCI. [Figure 4] Figures 4A and 4B show an example of setting / instructing the joint TCI state in a single DCI-based multi-TRP. [Figure 5] Figures 5A and 5B show an example of setting / instructing the separate TCI state in a single DCI-based multi-TRP. [Figure 6] Figures 6A and 6B show an example of setting / instructing the joint TCI state corresponding to the first value of the CORESET pool index in a multi-DCI-based multi-TRP. [Figure 7] Figures 7A and 7B show an example of setting / instructing the joint TCI state corresponding to the second value of the CORESET pool index in a multi-DCI-based multi-TRP. [Figure 8] Figures 8A and 8B show an example of inter-cell mobility. [Figure 9] Figure 9 shows the TCI state corresponding to the CSI-RS associated with the SSB of a non-serving cell. [Figure 10] Figure 10 shows an example of the relationship between beam reporting and reconstruction index. [Figure 11] Figure 11 shows an example of an inter-cell scenario in a multi-DCI-based multi-TRP. [Figure 12] Figure 12A shows the maximum number of additional PCI slots for Case 1. Figure 12B shows the maximum number of additional PCI slots for Case 2. [Figure 13] Figure 13 shows an example where SSB from a serving cell, SSB from a cell with additional PCI, and UL transmission overlap. [Figure 14]FIG. 14A is a diagram illustrating the TCI state of Rel. 15 and the configured DL / joint TCI state of Rel. 17. FIG. 14B is a diagram illustrating the indicated DL / joint TCI state. [Figure 15] FIGS. 15A and 15B are diagrams illustrating an example of TCI state setting and indication in the first embodiment. [Figure 16] FIG. 16A is a diagram illustrating a first example of TCI state setting and indication in the second embodiment. FIG. 16B is a diagram illustrating an example of correspondence between TCI codepoints and active TCI states. [Figure 17] FIG. 17A is a diagram illustrating a second example of TCI state setting and indication in the second embodiment. FIG. 17B is a diagram illustrating an example of correspondence between TCI codepoints and active TCI states. [Figure 18] FIG. 18 is a diagram illustrating an example of a schematic configuration of a radio communication system according to an embodiment. [Figure 19] FIG. 19 is a diagram illustrating an example of a configuration of a base station according to an embodiment. [Figure 20] FIG. 20 is a diagram illustrating an example of a configuration of a user terminal according to an embodiment. [Figure 21] FIG. 21 is a diagram illustrating an example of a hardware configuration of a base station and a user terminal according to an embodiment. [Figure 22] FIG. 22 is a diagram illustrating an example of a vehicle according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] (TCI, Spatial Relation, QCL) In NR, control of 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 coding) at a UE for at least one of signals and channels (referred to as signals / channels) based on Transmission Configuration Indication states (TCI states) is under consideration.

[0012] The TCI state may represent the one applied to the downlink signal / channel. The equivalent of the TCI state applied to the uplink signal / channel may be expressed as a spatial relation.

[0013] TCI status refers to information about signal / channel quasi-co-location (QCL), and may also be called spatial reception parameters or spatial relation information. TCI status may be set for each channel or signal in the UE.

[0014] QCL is an index that indicates the statistical properties of a signal / channel. For example, if two signals / channels have a QCL relationship, it may mean that we can assume that at least one of the following is identical between these different signals / channels: Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter).

[0015] The spatial reception parameters may correspond to the UE's received beam (e.g., the received analog beam), and the beam may be identified based on the spatial QCL. In this disclosure, QCL (or at least one element of QCL) may be interpreted as sQCL (spatial QCL).

[0016] QCL may have multiple types (QCL types). For example, there may be four QCL types A and D that differ in the parameters (or parameter sets) that can be assumed to be the same, and these parameters (which may also be called QCL parameters) are shown below: • 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 assumption by the UE that one control resource set (CORESET), channel, or reference signal is in a specific QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be called a QCL assumption.

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

[0019] The TCI state may, for example, be information regarding the QCL between the target channel (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 upper-layer signaling, physical layer signaling, or a combination thereof.

[0020] The channel on which the TCI state or spatial relationship is set (specified) may be, for example, at least one of the following: Physical Downlink Shared Channel (PDSCH), Physical Downlink Control Channel (PDCCH), Physical Uplink Shared Channel (PUSCH), or Physical Uplink Control Channel (PUCCH).

[0021] Furthermore, the RS that has a QCL relationship with the channel may be at least one of the following: 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)), or a QCL detection reference signal (also called a QRS).

[0022] An SSB is a signal block that includes 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 called an SS / PBCH block.

[0023] The RS of a QCL type X in a TCI state may also mean the RS in the relationship between a channel / signal (or its DMRS) and a QCL type X, and this RS may also be called the QCL source of the QCL type X in that TCI state.

[0024] QCL type A RS is always set for PDCCH and PDSCH, and QCL type D RS may be set additionally. Because it is difficult to estimate Doppler shift, delay, etc. from a single shot of DMRS reception, QCL type A RS is used to improve channel estimation accuracy. QCL type D RS is used for receiving beam determination when DMRS is received.

[0025] For example, TRS1-1, 1-2, 1-3, and 1-4 are transmitted, and TRS1-1 is advertised as QCL type C / D RS by the PDSCH's TCI state. By advertising the TCI state, the UE can use information obtained from past periodic TRS1-1 reception / measurement results to receive / channel estimate the DMRS for the PDSCH. In this case, the PDSCH's QCL source 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 in a DCI having a TCI field. The TCI state for PDSCH is indicated by the TCI field. The TCI field in DCI format 1-1 is 3 bits, and the TCI field in DCI format 1-2 is up to 3 bits.

[0027] In RRC connection mode, if the first DCI-based TCI information element (upper layer parameter tci-PresentInDCI) is set to "enabled" for a CORESET scheduling a PDSCH, the UE assumes that a TCI field exists in the DCI format 1_1 of the PDCCH sent by that CORESET.

[0028] Furthermore, if a second DCI-based TCI information element (upper layer parameter tci-PresentInDCI-1-2) is set in the UE for a CORESET that schedules a PDSCH, the UE assumes that the DCI format 1_2 of the PDSCH sent in that CORESET contains a TCI field with the DCI field size indicated by the second DCI-based TCI information element.

[0029] Furthermore, in Rel.16, a PDSCH may be scheduled with a DCI that does not have a TCI field. The DCI format of such DCI may be DCI format 1_0, or DCI format 1_1 / 1_2 in the case where the TCI information element within the DCI (upper layer parameter tci-PresentInDCI or tci-PresentInDCI-1-2) is not set (enabled). If a PDSCH is scheduled with a DCI that does not have a TCI field, and 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 that DCI) is greater than or equal to 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 the CORESET (e.g., the scheduling DCI).

[0030] In RRC connection mode, both when the DCI-internal TCI information elements (upper layer parameters tci-PresentInDCI and tci-PresentInDCI-1-2) are set to "enabled" and when the DCI-internal TCI information elements are not set, if the time offset between the reception of the DL DCI (the DCI that schedules the PDSCH) and the corresponding PDSCH (the PDSCH scheduled by that DCI) is less than the threshold (timeDurationForQCL) (applicable condition, condition 1), then, 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 within the active DL BWP of its CC (for a specific 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 within the active DL BWP of the scheduled CC.

[0031] In Rel.15, separate MAC CEs are required for the activation / deactivation of PUCCH spatial relations and for the activation / deactivation of SRS spatial relations. PUCCH spatial relations follow SRS spatial relations.

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

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

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

[0035] In Rel.15, the spatial relationships of PUCCH scheduled by DCI format 0_0 follow the spatial relationships of the PUCCH resource with the lowest PUCCH resource ID among the active spatial relationships of PUCCH on the same CC. The network must update the PUCCH spatial relationships on all SCells, even if no PUCCH is sent on a SCell.

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

[0037] The application conditions for default spatial relationships / default PL-RS for SRS may include the setting of the default beam path loss enablement information element for SRS (upper layer parameter enableDefaultBeamPlForSRS). The application conditions for default spatial relationships / default PL-RS for PUCCH may include the setting of the default beam path loss enablement information element for PUCCH (upper layer parameter enableDefaultBeamPlForPUCCH). The application conditions for default spatial relationships / default PL-RS for PUSCH scheduled by DCI format 0_0 may include the setting of the default beam path loss enablement information element for PUSCH scheduled by DCI format 0_0 (upper layer parameter enableDefaultBeamPlForPUSCH0_0).

[0038] In Rel.16, if RRC parameters (a parameter to enable the default beam PL for PUCCH (enableDefaultBeamPL-ForPUCCH), a parameter to enable the default beam PL for PUSCH (enableDefaultBeamPL-ForPUSCH0_0), or a parameter to enable the default beam PL for SRS (enableDefaultBeamPL-ForSRS)) are set for the UE, and no spatial relationship or PL-RS is set, the UE will apply the default spatial relationship / PL-RS.

[0039] The above threshold may also be called the 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. The above threshold may be reported by the UE as UE capability (per subcarrier interval).

[0040] If the offset (scheduling offset) between the reception of the DL DCI and the corresponding PDSCH is less than the threshold timeDurationForQCL, and at least one TCI state set for the serving cell of the scheduled PDSCH includes "QCL type D", and the UE has enabled two default TCI states (enableTwoDefaultTCIStates-r16), and at least one TCI code point (code point of the TCI field in the DL DCI) indicates two TCI states, then the UE assumes that the DMRS port of the serving cell's PDSCH or PDSCH transmission occasion is quasi co-located with respect to the RS and QCL parameters associated with the two TCI states corresponding to the lowest code point of the TCI code point containing two different TCI states (two default QCL assumption determination rule). The two default TCI states-enable-r16 behavior for two default TCI states for PDSCH is enabled when at least one TCI code point maps to two TCI states.

[0041] In Rel.15 / 16, the following default TCI states for PDSCH are specified: a default TCI state for single TRPs, a default TCI state for multi-TRPs based on multi-DCIs, and a default TCI state for multi-TRPs based on single-DCIs.

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

[0043] Rel.15 / 16 specifies the default spatial relationships and default PL-RS for PUSCH / PUCCH / SRS, respectively.

[0044] (Multi-TRP) In NR, it is being considered that one or more transmission / reception points (TRPs) (multi-TRPs (MTRPs)) will use one or more panels (multi-panels) to perform DL transmission to the UE. Furthermore, it is being considered that the UE will use one or more panels to perform UL transmission to one or more TRPs.

[0045] Multiple TRPs may correspond to the same cell identifier (Cell Identifier (ID)) or to different cell IDs. This cell ID may be a physical cell ID or a virtual cell ID.

[0046] Multiple TRPs (e.g., TRP #1, #2) may be connected by an ideal / non-ideal backhaul, and information, data, etc., may be exchanged. Each TRP in a multi-TRP may transmit a different code word (CW) and a different layer. Non-coherent joint transmission (NCJT) may be used as one form of multi-TRP transmission.

[0047] In NCJT, for example, TRP#1 modulates and layers a first codeword and transmits a first PDSCH using a first precode with a first number of layers (e.g., 2 layers). TRP#2 modulates and layers a second codeword and transmits a second PDSCH using a second precode with a second number of layers (e.g., 2 layers).

[0048] Furthermore, multiple PDSCHs (Multi-PDSCHs) that are NCJTed may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains. In other words, a first PDSCH from a first TRP and a second PDSCH from a second TRP may overlap in at least one of the time and frequency resources.

[0049] These first and second PDSCHs may be assumed not to be quasi-co-located. Reception of multiple PDSCHs may be reinterpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0050] Multiple PDSCHs from a multi-TRP (which may also be called multiple PDSCHs) may be scheduled using a single DCI (single DCI (S-DCI), single PDCCH) (single master mode). A single DCI may be transmitted from one TRP in the multi-TRP. A configuration using a single DCI in a multi-TRP may be called a single-DCI-based multi-TRP (mTRP / MTRP).

[0051] Multiple PDSCHs from a multi-TRP may be scheduled using multiple DCIs (multi-DCI (M-DCI), multi-PDCCH (multiple PDCCH)) (multi-master mode). Multiple DCIs may be transmitted from each of the multi-TRPs. A configuration that utilizes multiple DCIs in a multi-TRP may be called a multi-DCI-based multi-TRP (mTRP / MTRP).

[0052] A UE may assume that it sends separate CSI reports (CSI reports) for different TRPs, each for each TRP. Such CSI feedback may be called separate feedback, separate CSI feedback, etc. In this disclosure, “separate” may be interpreted as “independent.”

[0053] In URLLC for multiple TRPs, support for PDSCH (Transport Block (TB) or Codeword (CW)) repetition spanning multiple TRPs is being considered. Support for repetition schemes (URLLC schemes, e.g., schemes 1, 2a, 2b, 3, 4) spanning multiple TRPs on the frequency domain, layer (spatial) domain, or time domain is being considered. In scheme 1, multiple PDSCHs from multiple TRPs are performed using space division multiplexing (SDM). In schemes 2a and 2b, PDSCHs from multiple TRPs are performed using frequency division multiplexing (FDM). In scheme 2a, the redundant version (RV) is the same for multiple TRPs. In scheme 2b, the RV may be the same or different for multiple TRPs. In schemes 3 and 4, multiple PDSCHs from multiple TRPs are performed using time division multiplexing (TDM). In Scheme 3, multi-PDSCH signals from multi-TRPs are transmitted within a single slot. In Scheme 4, multi-PDSCH signals from multi-TRPs are transmitted within different slots.

[0054] Such multi-TRP scenarios allow for more flexible transmission control using high-quality channels.

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

[0056] A UE may be determined to be a multi-TRP based on multi-DCI if at least one of the following conditions 1 and 2 is met. In this case, TRP may be interpreted as a CORESET pool index. [Condition 1] A CORESET pool index of 1 is set. [Condition 2] Two different values ​​(e.g., 0 and 1) are set for the CORESET pool index.

[0057] The UE may determine a single DCI-based multi-TRP if the following conditions are met. In this case, the two TRPs may be interpreted as two TCI states indicated by MAC CE / DCI. [conditions] The "Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE" is used to specify one or two TCI states for a single code point in the TCI field within the DCI.

[0058] The DCI for common beam indication may be in 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 in a UE-group common DCI format.

[0059] (Unified / Common TCI Framework) According to the Unified TCI Framework, UL and DL channels can be controlled by a common framework. Rather than defining 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 be applied to all UL channels, and a common beam for DL ​​may be applied to all DL channels.

[0060] One common beam for both DL and UL, or a common beam for DL ​​and a common beam for UL (two common beams in total) are being considered.

[0061] The UE may assume the same TCI state (joint TCI state, joint TCI pool, joint common TCI pool, joint TCI state set) for UL and DL. Alternatively, the UE may assume different TCI states for UL and DL respectively (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 by beam management based on MAC CE (MAC CE level beam indication). Alternatively, the default TCI status of PDSCH may be updated to match 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 MAC CE. DCI may select one from the X active TCI states. The selected TCI state may be applied to both UL and DL channels / RS.

[0064] A TCI pool (set) may be multiple TCI states configured by the RRC parameter, or multiple TCI states (active TCI states, active TCI pool, set) activated by MAC CE from among multiple TCI states configured by the RRC parameter. Each TCI state may be a QCL type A / D RS. SSB, CSI-RS, or SRS may be set as the QCL type A / D RS.

[0065] The number of TCI states corresponding to each of the one or more TRPs may be defined. For example, the number of TCI states N (≧1) applied to the UL channel / RS (UL TCI states) and the number of TCI states M (≧1) applied to the DL channel / RS (DL TCI states) may be defined. At least one of N and M may be notified / set / instructed to the UE via upper layer signaling / physical layer signaling.

[0066] The case M>1 / N>1 may indicate at least one of the following: a TCI status indication for multiple TRPs, and multiple TCI status indications for interband CAs.

[0067] In the example in Figure 1A, the RRC parameter (information element) sets up multiple TCI states for both DL and UL. MAC CE may activate multiple TCI states from the set up TCI states. DCI may indicate one of the activated TCI states. DCI may be a UL / DL DCI. The indicated TCI state may be applied to at least one (or all) of the UL / DL channels / RS. A single DCI may indicate both UL TCI and DL TCI.

[0068] In the example in Figure 1A, one point may represent a single TCI state that applies to both UL and DL, or it may represent two TCI states that apply to UL and DL respectively.

[0069] At least one of the multiple TCI states set by the RRC parameter and the multiple TCI states activated by MAC CE may be called a TCI pool (common TCI pool, joint TCI pool, TCI state pool). The multiple TCI states activated by MAC CE may be called an active TCI pool (active common TCI pool).

[0070] In this disclosure, the higher-layer parameters (RRC parameters) that set up multiple TCI states may also be referred to as configuration information that sets up multiple TCI states, or simply as "configuration information." Furthermore, in this disclosure, being directed to one of multiple TCI states using DCI may mean receiving instruction information that directs to one of the multiple TCI states included in DCI, or simply receiving "instruction information."

[0071] In the example in Figure 1B, the RRC parameter sets up multiple TCI states (joint common TCI pool) for both DL and UL. MAC CE may activate multiple TCI states (active TCI pool) from the set up multiple TCI states. Separate active TCI pools for UL and DL may be set up / activated.

[0072] A DL DCI, or a new DCI format, may select (instruct) one or more (e.g., one) TCI states. The selected TCI state may be applied to one or more (or all) DL channels / RS. 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. A UL DCI, or a new DCI format, may select (instruct) one or more (e.g., one) TCI states. The selected TCI state may be applied to one or more (or all) UL channels / RS. UL channels may be PUSCH / SRS / PUCCH. Thus, different DCIs may instruct UL TCI and DL DCI separately.

[0073] Existing DCI formats 1_1 / 1_2 may be used to indicate common TCI states.

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

[0075] The DCI format indicating the TCI status (DCI format 1_1 / 1_2) may be a DCI format without DL assignment. In this disclosure, the DCI format without DL assignment, the DCI format without scheduling PDSCH (DCI format 1_1 / 1_2), the DCI format that does not include one or more specific fields (DCI format 1_1 / 1_2), the DCI format in which one or more specific fields are set to fixed values ​​(DCI format 1_1 / 1_2), and so on may be interpreted interchangeably.

[0076] For DCI formats without DL assignments (DCI formats that do not include one or more specific fields), the specific field may be any field 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 set), the Transmission Power Control (TPC) command field (for scheduled PUCCHs), the PUCCH resource indicator field, and the PDSCH-to-HARQ feedback timing indicator field (if present). The specific field may be set as a reserved field or ignored.

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

[0078] All RV fields may be set to 1. All MCS fields may be set to 1. All NDI fields may be set to 0. All FDRA fields for type 0 may be set to 0. All FDRA fields for type 1 may be set to 1. All FDRA fields for dynamic switches (upper layer parameter dynamicSwitch) may be set to 0.

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

[0080] (Unified TCI status for multi-TRP) A single DCI-based multi-TRP may be assumed to be supported when the multi-TRP utilizes an ideal backhaul (see Figure 2A).

[0081] In this case, one beam indicator DCI may indicate multiple TCI states for each TRP. These multiple TCI states 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 this disclosure, one TCI state may mean one joint (DL / UL) TCI state, or 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 multiple TRPs utilize ideal backhaul / non-ideal backhaul (see Figure 2B).

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

[0085] The ideal backhaul may also 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 also 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 state included in the DCI (TCI field) may follow at least one of the following options 0-1 and 0-2.

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

[0088] [Options 0-2] The TCI fields defined up to Rel. 15 / 16 may be extended (see Figure 3B). For example, a DCI may contain multiple TCI fields (e.g., two). The number of bits in each TCI field may be a specific number (e.g., 3).

[0089] In options 0-2, DCI without DL assignments does not incur additional DCI overhead. On the other hand, DCI with DL assignments incurs additional DCI overhead.

[0090] For a single DCI-based multi-TRP, in the case of a joint TCI state, the DL / UL (joint) TCI state may be activated to the UE using MAC CE. The UE may then use DCI (beam indication) to indicate the first DL / UL (joint) TCI state and the second DL / UL (joint) TCI state (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 Figure 4B).

[0092] In the example shown in Figure 4B, all TCI code points corresponding to the active TCI state correspond to two TCI states. However, 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.

[0093] For a single DCI-based multi-TRP, in the case of a separate TCI state, the DL (separate) TCI state and UL (separate) TCI state may be activated to the UE using MAC CE. The UE may then use DCI (beam indication) to specify 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 (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). However, 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] In Figure 5A, an example is shown where separate TCI states are activated by MAC CE for the DL TCI state and the UL TCI state. However, even in the case of separate TCI states, the activated DL TCI state and UL TCI state may include a common TCI state.

[0097] For multi-DCI based multi-TRP, at least one of the following may be performed for each CORESET pool index: setting the TCI status by RRC, activation by MAC CE, and instruction by DCI.

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

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

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

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

[0102] When the DCI corresponding to each CORESET pool index indicates the same TCI state (TCI state ID) (for example, when TCI state #7 corresponding to TCI code point "111" in Figures 6B and 7B is indicated), the UE may determine that a single TCI state has been indicated. In this case, the UE may perform an operation using a single TRP.

[0103] Although the above explanation of multi-DCI-based multi-TRP was based on an example using a joint TCI state, it can also be appropriately applied to cases using a separate TCI state.

[0104] In this disclosure, the indicated TCI state, Rel.17 TCI state, common TCI state, and unified TCI state may be interpreted as mutually exclusive. In this disclosure, the common TCI state, Rel.17 TCI state, and Rel.18 TCI state applied to channels / signals utilizing multiple TRPs may be interpreted as mutually exclusive.

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

[0106] The specific channel / signal may be a UE-specific (dedicated) DL channel / signal. The UE-specific DL channel / signal 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. The specific UL channel / signal may be at least one of the following: a PUSCH indicated by DCI (indicated by dynamic grant), a configured grant PUSCH, multiple (all) unique PUCCHs (resources), or an SRS (e.g., an aperiodic (A-)) SRS).

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

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

[0110] A single TRP PDSCH may be scheduled in a specific DCI (DCI format). This specific DCI format may be, for example, DCI format 1_0 (or a DCI format that does not include a TCI field). This specific DCI format may also be DCI format 1_1 / 1-2. This specific DCI format may indicate a single TCI state.

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

[0112] The UE does not need to be configured to repeatedly transmit multiple TRPs. In this case, the single TRP PDSCH may be scheduled as a single-layer MIMO (with single-layer MIMO) PDSCH.

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

[0114] A single TRP PDSCH may be a PDSCH scheduled in a CORESET of at least CSS. A single TRP PDSCH may be a PDSCH scheduled in a CORESET of CSS only (or CSS other than type 3 CSS).

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

[0116] A single TRP PDSCH may be scheduled in a specific DCI (DCI format). This specific DCI format may be DCI format 1_1 / 1-2. This specific DCI format may indicate two TCI states.

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

[0118] The UE does not need to be configured to repeatedly transmit multi-TRP. In this case, the multi-TRP PDSCH may be scheduled as a multi-layer MIMO (with multi-layer MIMO) PDSCH.

[0119] The PDSCH for multi-TRP may also be the PDSCH used when the UE is configured to perform repetition transmissions of multi-TRP. In this case, the multi-TRP PDSCH may be scheduled as a (with repetition) PDSCH (using TDM / FDM / SDM).

[0120] A multi-TRP PDSCH may be a PDSCH when SFN scheme A / B is set on the UE. A multi-TRP PDSCH may also be a PDSCH having multiple TCI states.

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

[0122] A single TRP PDCCH may also be a PDCCH associated with a CORESET where SFN scheme A / B is not configured.

[0123] A single TRP PDCCH may also be a PDCCH associated with a CORESET (of two linked SSs) where repeated transmission is not configured.

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

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

[0126] Each embodiment of the present disclosure may be applied to a single TRP push / pucch.

[0127] A single TRP push / pucch may also be a multi-TRP push / pucch that does not have repeated transmission configured.

[0128] Each embodiment of this disclosure may be applied to a multi-TRP push / pucch.

[0129] The PUSCH / PUCCH for multi-TRP may also be the PUSCH / PUCCH that sets the repeated transmission of multi-TRP.

[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 being considered that one or more transmission / reception points (TRPs) (multi-TRPs (MTRPs)) will perform DL transmissions to the UE. It is also being considered that the UE will perform UL transmissions to one or more TRPs.

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

[0133] Figure 8A shows an example of inter-cell mobility including a non-serving cell (e.g., Single-TRP inter-cell mobility). The UE may configure one TRP (or 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 from the base station / TRP of cell #3 (PCI#3), which is not the serving cell (it becomes a non-serving cell). This corresponds, for example, to the UE switching 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. The selection of the port (e.g., antenna port) / TRP may be performed based on the TCI status indicated or updated by DCI / MAC CE. Here, we show a case where different Physical Cell Identifier (PCI) settings are supported for cell #1 and cell #3.

[0135] Such inter-cell mobility (e.g., L1 / L2 inter-cell mobility) allows a UE to send and receive UL / DL channel / RS to and from cells with a PCI different from that of the serving cell. For example, if the RSRP of a non-serving cell is greater than that of the serving cell, the UE can send and receive UL / DL channel / 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, it shows a case where the UE receives channels / signals from the base station / TRP of cell #1 (PCI#1), which is a serving cell, and from the base station / TRP of cell #3 (PCI#3), which is not a serving cell (it becomes a non-serving cell). In Figure 8B, the multi-DCI based multi-TRP using NCJT described above is applied to the TRP of PCI#1 and the TRP of PCI#3.

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

[0138] Figure 9 shows the TCI states corresponding to CSI-RS associated with the SSB of a non-serving cell. PCI#1 and #3 in Figure 9 correspond to PCI#1 and #3 in Figure 8A. When inter-cell mobility as shown in Figure 8A is performed, the UE switches the TCI state used for receiving DL from TCI state#1 to TCI state#2.

[0139] <Beam Report and Reconstructed Index> Figure 10 shows an example of the relationship between beam reporting and the reconstruction index. As shown in Figure 10, the beam reporting (CSI reporting) for a non-serving cell includes the RSRP value and the CRI or SSBRI. The CRI or SSBRI is related to the reconstruction index (ID for PCI).

[0140] A recreated index is a newly created index based on PCI and is associated with at least a portion of PCI. The recreated index is set by the RRC in the UE and may be assigned a number up to 7 corresponding to additional PCI (PCI of a non-serving cell). A recreated index (ID) of 0 may represent a serving cell (a serving cell's PCI). Because the recreated index can be represented with fewer bits than PCI, communication overhead can be reduced.

[0141] <Multi-TRP cell inter-scenarios> This section describes inter-cell scenarios (inter-cell mobility) in multi-DCI based multi-TRP. When multi-TRP is applied, a coresetPoolIndex is set. As shown in Figure 11, Additional PCIs are associated with activated TCI states (SSB as QCL source RS) corresponding to PDSCH / PDCCH. One PCI is associated with an activated TCI state corresponding to one coresetPoolIndex.

[0142] Furthermore, as shown in Figure 11, the PCI of a serving cell is always associated with an activated TCI state, and additional PCIs (SSBs corresponding to additional PCIs) are associated with only one active TCI state. Rate matching may be performed around the SSB associated with the PCI of a serving cell for the PDCCH / PDSCH corresponding to the serving cell. Rate matching may also be performed around the SSB associated with the additional PCI for the PDCCH / PDSCH corresponding to the additional PCI. In addition, shared search spaces (CSS) of types 0 / 0A / 1 / 2 do not need to be monitored.

[0143] The serving cell and the cell with additional PCIs may have the same center frequency, subcarrier spacing (SCS), and system frame number (SFN) offset. The RRC may configure up to seven additional PCIs. Furthermore, the UE may report its UE capability indicating the maximum number of additional PCIs, X.

[0144] Regarding X for the maximum number of additional PCI slots set as UE capabilities, the following two cases are possible. Note that Case 1 and Case 2 do not need to be enabled simultaneously. [Case 1] X represents the maximum number of additional PCIs whose corresponding "SSB time domain position and period" is the same as that of the serving cell (let's call this X X1). [Case 2] X represents the maximum number of additional PCIs in which part or all of the corresponding "SSB time domain position and period" is different from the serving cell (let's call this X2).

[0145] Figure 12A shows the maximum number of additional PCI slots for Case 1. In Figure 12A, X1 is 4. Figure 12B shows the maximum number of additional PCI slots for Case 2. In Figure 12B, X2 is 8.

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

[0147] In the QCL-related rules being considered for adoption in Rel.17, for PDCCH / PDSCH DMRS, the configured DL / joint TCI state is identified as "DL or Joint TCI State" excluding the indicated "DL or Joint TCI State". 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 state for Rel. 15 and the configured DL / joint TCI state for Rel. 17. Figure 14B shows the indicated DL / joint TCI state. Figure 14B differs from Figure 14A in that the third row relationship is not supported. "Configured" may mean configured by upper layer (RRC) signaling. "Indicated" may mean indicated by DCI.

[0149] (Antenna port quasi co-location (QCL)) It has been noted that in the section on antenna port QCL in Rel.17, the Tracking Reference Signal (TRS) is specified as follows. Furthermore, NZP-CSI-RS-ResourceSet is a higher-layer parameter for the non-zero-power CSI-RS resource set.

[0150] <trs> For periodic CSI-RS resources in a NZP-CSI-RS-ResourceSet configured with higher layer parameter trs-Info, the UE expects that a TCI state indicates either QCL type of the following (1) or (2). (1) "typeC" corresponding to an SS / PBCH block, and, if applicable, "typeD" corresponding to the same SS / PBCH block. (2) "typeC" for an SS / PBCH block, and, if applicable, "typeD" corresponding to a CSI-RS in a NZP-CSI-RS-ResourceSet configured with higher layer parameter repetition.

[0151] Regarding antenna port QCL in Rel.17, it is being considered that provisions related to CSI-RS corresponding to repeated transmission are specified as follows.

[0152] <CSI-RS corresponding to repetition> For CSI-RS resources in a NZP-CSI-RS-ResourceSet configured with higher layer parameter repetition, the UE expects that a TCI state indicates any one of QCL types of the following (1) to (3). (1) "typeA" corresponding to a CSI-RS resource in a NZP-CSI-RS-ResourceSet configured with higher layer parameter trs-Info, and, if applicable, "typeD" corresponding to the same CSI-RS resource. (2) "typeA" corresponding to a CSI-RS resource in a NZP-CSI-RS-ResourceSet configured with higher layer parameter trs-Info, and "typeD" corresponding to a CSI-RS resource in a NZP-CSI-RS-ResourceSet configured with higher layer parameter repetition. (3) A "type C" corresponding to an SS / PBCH block, and, where applicable, a "type D" corresponding to the same SS / PBCH block. This reference RS may additionally be an SS / PBCH block having 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 the SS / PBCH block from the serving cell and the SS / PBCH block having a PCI different from that of the serving cell.

[0153] (NZP CSI-RS) In the section of Rel.17 for NZP CSI-RS, it is being considered that the following provision should be made: This section does not prohibit CSI-RS (including TRS) from being associated with SSBs that have additional PCI.

[0154] For each CSI-RS resource configuration, parameters that the UE assumes to have non-zero transmit power for the CSI-RS resource are set via the higher-layer parameters NZP-CSI-RS-Resource, CSI-ResourceConfig, and NZP-CSI-RS-ResourceSet, for example, (1) qcl-InfoPeriodicCSI-RS. (1) The qcl-InfoPeriodicCSI-RS contains a reference to a TCI state indicating the QCL source RS(s) and QCL type. If the TCI state is set with a reference to an RS that sets the QCL type to type D, that RS may be an SS / PBCH block located in the same or different CC / DL BWP, or a CSI-RS resource located in the same or different CC / DL BWP that is set to periodic. The referenced RS may also 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 terminals will control transmission and reception processing based on QCL information (QCL assumption / Transmission Configuration Indication (TCI) state / spatial relationships). It is being considered that the configured / activated / indicated TCI state will be applied to multiple types of signals (channel / RS). Furthermore, 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 status is unclear. For example, the relationship between the TCI status applied to multiple types of signals (channel / RS) and the physical cell ID of the serving cell or non-serving cell was not clear. If the method for indicating the TCI status is unclear, it may lead to a decrease in communication quality, throughput, and other problems.

[0157] Therefore, the inventors devised a method for appropriately indicating the TCI status.

[0158] The embodiments of this disclosure will be described in detail below with reference to the drawings. Each wireless communication method according to the embodiments may be applied individually or in combination.

[0159] In this disclosure, "A / B" and "at least one of A and B" may be interpreted as mutually exclusive. In this disclosure, "A / B / C" may mean "at least one of A, B, and C".

[0160] In this disclosure, terms such as activate, deactivate, indicate, select, configure, update, and determine may be interpreted interchangeably. In this disclosure, terms such as support, control, controllable, operate, and operable may be interpreted interchangeably.

[0161] In this disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher-layer parameters, fields, Information Elements (IE), settings, etc., may be interpreted interchangeably. In this disclosure, Medium Access Control elements (MAC Control Element (CE)), update commands, activation / deactivation commands, etc., may be interpreted interchangeably.

[0162] In this disclosure, the upper-layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0163] In this disclosure, MAC signaling may include, for example, MAC Control Elements (MAC CEs) and MAC Protocol Data Units (PDUs). Broadcast information may include, for example, Master Information Blocks (MIBs), System Information Blocks (SIBs), Remaining Minimum System Information (RMSIs), and Other System Information (OSIs).

[0164] In this disclosure, physical layer signaling may include, for example, Downlink Control Information (DCI) and Uplink Control Information (UCI).

[0165] In this disclosure, terms such as index, identifier (ID), indicator, and resource ID may be interpreted interchangeably. In this disclosure, terms such as sequence, list, set, group, cluster, and subset may be interpreted interchangeably.

[0166] In this disclosure, the terms used include: panel, UE panel, panel group, beam, beam group, precoder, Uplink (UL) transmit entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relationship, 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 relationship group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) groups, PUCCH resource groups, resources (e.g., reference signal resources, SRS resources), resource sets (e.g., reference signal resource sets), CORESET pools, 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 assumptions, etc., may be interpreted interchangeably.

[0167] Furthermore, the spatial relationship information Identifier (ID) (TCI state ID) and spatial relationship information (TCI state) may be interpreted as mutually exclusive. "Spatial relationship information" may be interpreted as mutually exclusive as "a set of spatial relationship information," "one or more spatial relationship information," etc. TCI state and TCI may be interpreted as mutually exclusive.

[0168] In this disclosure, terms such as drop, suspension, cancellation, puncture, rate match, and postponement may be interpreted interchangeably.

[0169] In this disclosure, common beam, common TCI, common TCI state, Rel.17 TCI state, TCI state after Rel.17, unified TCI, unified TCI state, TCI state applicable to multiple types of channel / RS, TCI state applicable to multiple (multiple types) of channel / RS, TCI state applicable to multiple types of channel / RS, TCI state for multiple types of signals, TCI state for multiple types of channel / 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 DL ​​and UL respectively may be interpreted as one another.

[0170] In this disclosure, the TCI states of Rel.15 / 16, the TCI states / spatial relationships applicable only to specific channels / RSs, and the TCI states / spatial relationships applicable to one type of channel / RS may be interpreted as mutually exclusive.

[0171] In this disclosure, multiple TCI states set by RRC IE, multiple TCI states activated by MAC CE, information about one or more TCI states, TCI state setting, 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, separate UL TCI state pool may be interpreted as one another.

[0172] In this disclosure, DL TCI, DL only TCI, separate DL only TCI, DL common TCI, DL unified TCI, common TCI, and unified TCI may be interpreted interchangeably. In this disclosure, UL TCI, UL only TCI, separate UL only TCI, UL common TCI, UL unified TCI, common TCI, and unified TCI may be interpreted interchangeably.

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

[0174] In this disclosure, 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 resources in an NZP CSI-RS resource set having TRS information may be interpreted as one another. In this disclosure, CSI-RS resources, CSI-RS resource sets, CSI-RS resource groups, and information elements (IEs) may be interpreted as one another.

[0175] In this disclosure, non-serving cell, candidate serving cell, cell with a different PCI than the serving cell, and another serving cell with a different PCI may be used interchangeably with each other. A different PCI than the serving cell and an additional PCI may be used interchangeably with each other. Cell and PCI may be used interchangeably with each other.

[0176] In this disclosure, TRS, tracking CSI-RS, CSI-RS having TRS information (upper layer parameter trs-Info), and NZP-CSI-RS resource in the NZP-CSI-RS resource set having TRS information may be interpreted as mutually exclusive.

[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 in the TCI state or QCL assumption may be interpreted as mutually exclusive. The terms RS of QCL type X, DL-RS associated with QCL type X, DL-RS having QCL type X, DL-RS source, SSB, and CSI-RS may be interpreted as mutually exclusive. X is, for example, one of A, B, C, or D.

[0178] In this disclosure, the statements that Y's QCL source is Z, that Y and Z are in a QCL relationship, that Y and Z are in a QCL type X relationship, and that Y's TCI state indicates a QCL type X with Z (QCL-type X with M) may be interpreted as being interchangeable with each other. 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, or SSB of the PDSCH / PDCCH. The DM-RS, CSI-RS, TRS, and SSB of the PDSCH / PDCCH may be interpreted as the TCI state of the DM-RS, CSI-RS, TRS, and SSB of the PDSCH / PDCCH, respectively. The SSB and SS / PBCH blocks may be interpreted as being interchangeable with each other.

[0179] Z corresponding to Y, Z having Y (Z with Y), and Y having Z (Y with Z) may be interpreted as mutually exclusive. Type X and QCL type X may be interpreted as mutually exclusive. The X in question is, for example, one of A, B, C, or D. SS / PBCH blocks having a PCI different from that of a serving cell and SS / PBCH blocks of non-serving cells may be interpreted as mutually exclusive.

[0180] In this disclosure, the designation Rel.XX may refer to a 3GPP release. XX represents a release number, but is not limited to the numbers shown in this disclosure and may be replaced with other release numbers. For example, Rel.18 may be replaced with any release number from Rel.18 onward. The designation Rel.XX may be omitted.

[0181] "Instructed" may be rephrased as "Instructed using DCI." "Configured" may be rephrased as "Configured using RRC / MAC CE."

[0182] (Wireless communication method) <First Embodiment> Unified TCI states for multi-TRPs may be applied to the inter-cell operation of multi-TRPs. That is, a UE may receive instruction information for multiple transmit-set-instruction (TCI) states (unified TCI states) applied to multiple signals, and based on that instruction information, apply the multiple TCI states to the signals transmitted and received with multiple TRPs, respectively. 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 being considered that only multi-DCI multi-TRPs will be supported for inter-cell operation of multi-TRPs. Additionally, it is being considered that one CORESETPoolIndex will be associated with one PCI (serving cell PCI or additional PCI).

[0184] The association between the CORESETPoolIndex / TCI status and PCI may be indicated by RRC signaling (e.g., ControlResourceSets) / MAC CE / DCI.

[0185] In other words, if the number of additional PCIs is set for the UE, the UE is set to a unified TCI state in Rel.17 (DL / joint / UL TCI state, or TCI state in Rel.18), and a TCI state of N,M>1 (DL / joint / UL TCI state>1) is indicated, then 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 for 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] Figures 15A and 15B show 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 Figures 6B and 7B, so it is omitted (Figure 6B corresponds to Figure 15A, and Figure 7B corresponds to Figure 15B). As shown in Figure 15A, the CORESETPoolIndex=0 and 1stDL / UL TCI state corresponds to PCI#1, and the CORESETPoolIndex=1 and 2ndDL / UL TCI state corresponds to PCI#2. In other words, each TCI state corresponds to (is associated with) a different PCI.

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

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

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

[0191] A single TRP index may be associated with a single PCI (either a serving cell PCI or an additional PCI). When the UE is configured with a NumberOfAdditionalPCI, a unified TCI state (DL / joint / UL TCI state in Rel.17, or in Rel.18), and a TCI state of N,M>1 (DL / joint / UL TCI state>1) is 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 shows a first example of setting and indicating TCI states in a second embodiment. Figure 16B shows an example of the correspondence between TCI code points and active TCI states. In Figure 16A, as in Figure 4A, one DCI indicates the 1st DL / UL (joint) TCI state and the 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 shows a second example of setting and indicating TCI states in the second embodiment. Figure 17B shows an example of the correspondence between TCI code points and active TCI states. In Figure 17A, as in Figure 5A, one DCI indicates the 1stDL TCI state, 2ndDL TCI state, 1stUL TCI state, and 2ndUL TCI state (separate TCI state). The 1stDL TCI state and 1stUL TCI state are associated with PCI#1, and the 2ndDL TCI state and 2ndUL 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 apply. (1) The UE assumes that the center frequency, SCS, and SFN offset are the same for the SS / PBCH block corresponding to the serving cell and the SS / PBCH block corresponding to a PCI different from the serving cell. (2) The UE receives two PDSCHs from two TRPs (two cells with different PCIs) within a single cyclic prefix (CP) in the time domain. (3) The UE transmits two UL signals to the 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 L1 / L2 inter-cell mobility in Rel.17 (see, for example, Figure 8A). One PCI is associated with only one indicated Rel.17 TCI state.

[0197] A single TRP is applied to the multi-TRP inter-cell operation of Rel.17 (see, for example, Figure 8B). In this case, 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 L1 / L2 cell mobility (see, for example, Figure 8A) and multi-TRP cell operation (see, for example, Figure 8B) may be configured simultaneously. In other words, the UE may receive PDSCH from multiple TRPs using NCJT and select one TRP from those multiple TRPs (it may switch serving cells) based on the TCI state indicated or updated by the DCI / MAC CE. In this case, a unified TCI state may be used for beam indication. Also in this case, at least one of the following limitations (3-1) and (3-2) may apply.

[0199] (3-1) If two TCI states exist (indicated TCI state or configured TCI state), at least one TCI state is associated with the serving cell PCI. The other TCI state is associated with an additional PCI. This is the same as the operation of Rel.17, and the UE can always send and receive signals to and from the serving cell. (3-2) If two TCI states exist (indicated TCI state or configured TCI state), both TCI states may be associated with the Serving Cell PCI only, the Additional PCI only, or both PCIs (Serving Cell PCI and Additional PCI).

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

[0201] <Fourth Embodiment> In Rel.17's L1 / L2 inter-cell mobility, the UE can always send and receive signals to and from the serving cell. The UE may receive cell-related information (system information, paging, short messages) only from the serving cell. Alternatively, it may receive cell-related information from the serving cell while only the TCI state of a non-serving cell is active.

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

[0203] When switching serving cells in L1 / L2, the UE may receive the settings for multiple serving cells via RRC, and then, via MAC CE / DCI, specify (select) some of these multiple serving cells and perform transmission and reception with the specified serving cells. As an example of MAC CE / DCI, a new MAC CE may be defined, or a new DCI format / DCI field may be defined. Alternatively, the UE may switch serving cells by switching the TCI state using a mechanism similar to the L1 / L2 inter-cell mobility in Rel. 17.

[0204] [First aspect] If the mobility function of Rel.18 is configured (for example, if higher-level parameters for multiple cells (such as servingcellconfig) are configured), the UE may use the unified TCI state of Rel.17 / 18 (joint / DL / UL TCI) to indicate the TCI state of at least one PCI-corresponding cell.

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

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

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

[0208] 《Option 4-2》 When a UE switches a serving cell (servingcellconfig) by switching TCI states (MAC CE / DCI), it 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 specified TCI state is associated with the PCI of the serving cell or with another PCI.

[0209] The number of specified TCI states may be limited to 1 (only single TRP may be applied), or it may be 1 or more (multi-TRP inter-cell operation may be applied). Alternatively, the number of TCI states corresponding to the PCI of the serving cell may be 1 or more, while the number of TCI states corresponding to the PCI of the non-serving cell (the serving cell after the switchover) may be 1. In other words, single TRP may be applied only when a cell switchover occurs.

[0210] In Rel.18, since serving cell switching occurs, multi-TRP cell operation (see, for example, Figure 8B) does not need to be supported. In other words, it does not need to assume that multiple indicated TCI states are assumed, or that multiple TCI states related to multiple PCIs are assumed to be assumed simultaneously.

[0211] Alternatively, Rel.18 may support multi-TRP cell operation. If multiple TCI states associated with multiple PCIs are indicated simultaneously, the PCI associated with the first (or second) TCI state may be designated as the serving cell, and the PCI associated with the second (or first) TCI state may be designated as the non-serving cell. In other words, the UE may switch the information regarding the serving cell to the indicated serving cell.

[0212] [Second aspect] In Rel.18, the UE may receive cell-related information (system information, paging, short messages) only from the serving cell. Furthermore, when only the TCI state of non-serving cells 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, serving cells are switched by MAC CE / DCI, so if a serving cell is switched from one cell to another at a given time, that "other cell" will become the serving cell at the next time point, allowing the UE to properly receive information about the cell from the serving cell at that time.

[0214] In Rel.18, at least some of the following constraints (1) to (3), as described in the second embodiment, may be applied, or none of the constraints may be applied. (1) The UE assumes that the center frequency, SCS, and SFN offset are the same for the SS / PBCH block corresponding to the serving cell and the SS / PBCH block corresponding to a PCI different from the serving cell. (2) The UE receives two PDSCHs from two TRPs (two cells with different PCIs) within a single cyclic prefix (CP) in the time domain. (3) The UE transmits two UL signals to the 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 existing serving cell specifications will be switched at L1 / L2. In other words, MAC CE / DCI handover will be possible. However, there is a possibility that a complete handover may not be possible. For example, the TA may not be updated even if the serving cell is switched.

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

[0217] Alternatively, if existing serving cells are switched by MAC CE / DCI, the above new terminology becomes unnecessary, and at least some parameters (e.g., TA values, TAG values, etc.) may be common across multiple serving cells. "Across multiple serving cells" may mean cells related to multiple serving cell configurations (ServingCellConfig) set by RRC.

[0218] According to this embodiment, it is possible to receive appropriate information regarding the operation of a terminal compatible with Rel.18.

[0219] <Supplement> At least one of the embodiments described above may apply only to a UE that has reported or supports a particular UE capability.

[0220] The specific UE capability may represent at least one of the following: • To support specific processing / operation / control / information for at least one of the above embodiments. • Support a unified TCI state for inter-cell operation of multi-TRPs. • The number of PCI slots that can be configured by the UE. • The number of PCIs associated with the active TCI state. • Support for joint TCI, DL TCI state, and / or UL TCI state.

[0221] Furthermore, the specific UE capabilities described above may be capabilities that apply across all frequencies (commonly regardless of frequency), capabilities per frequency (e.g., cell, band, BWP), capabilities per frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or capabilities per subcarrier spacing (SCS).

[0222] Furthermore, the specific UE capabilities described above may be capabilities that apply across all duplexing schemes (common to all duplexing schemes), or they may be capabilities specific to each duplexing scheme (e.g., Time Division Duplex (TDD), Frequency Division Duplex (FDD)).

[0223] Furthermore, at least one of the embodiments described above may apply when the UE is configured with specific information related to the embodiments described above through upper-layer signaling.

[0224] If the UE does not support at least one of the above-mentioned specific UE capabilities or does not have the above-mentioned specific information configured, the behavior of, for example, Rel.15 / 16 may be applied.

[0225] (Note) The following invention is added with respect to one embodiment of this disclosure. [Note 1] A receiving unit that receives instruction information for multiple transmission setting instruction (TCI) states applied to multiple signals, The system includes a control unit that applies the plurality of TCI states to signals utilizing a plurality of transmit / receive points (TRPs) based on the instruction information, Each of the aforementioned multiple TCI states is a TCI state that applies to both the downlink (DL) signal and the uplink (UL) signal, or a TCI state that applies to the DL signal and a TCI state that applies to the UL signal. Each of the aforementioned multiple TCI states is associated with a different physical cell ID (PCI). Terminal. [Note 2] The receiving unit receives one downlink control information (DCI) that schedules multiple physical downlink sharing channels (PDSCHs) from the multiple TRPs. At least one of the aforementioned multiple TCI states is related to a PCI different from the serving cell. The terminals listed in Appendix 1. [Note 3] The receiving unit receives a physical downlink sharing channel (PDSCH) from multiple TRPs using non-coherent joint transmission. The control unit selects one TRP from a plurality of TRPs based on the TCI state indicated by at least one of the Downlink Control Information (DCI) and the Medium Access Control Control Element (MAC CE). The terminals listed in Appendix 1 or Appendix 2. [Note 4] The control unit switches serving cells based on the pre-specified TCI states of serving and non-serving cells, and at least one of DCI and MAC CE. The terminals listed in any of the appendices 1 through 3.

[0226] (Wireless communication system) The configuration of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any or a combination thereof of the wireless communication methods according to the above embodiments of this disclosure.

[0227] Figure 18 shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc., as specified by the Third Generation Partnership Project (3GPP).

[0228] Furthermore, the wireless communication system 1 may support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and so on.

[0229] In EN-DC, the LTE (E-UTRA) base station (eNB) is the Master Node (MN), and the NR base station (gNB) is the Secondary Node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0230] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both MN and SN are NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0231] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) located within the macrocell C1 that form a small cell C2 that is narrower than the macrocell C1. User terminals 20 may be located within at least one cell. The arrangement and number of each cell and user terminal 20 are not limited to the configuration shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, they will be collectively referred to as base station 10.

[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 (CC) and Dual Connectivity (DC).

[0233] Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). A macrocell C1 may be included in FR1, and a small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may fall in a frequency band higher than FR2.

[0234] Furthermore, the user terminal 20 may communicate using at least one of the following methods at each CC: Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0235] Multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, if NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is the upstream station, may be called an Integrated Access Backhaul (IAB) donor, and base station 12, which is the relay station, may be called an IAB node.

[0236] Base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include at least one of the following: Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0237] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0238] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access scheme may be used. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc., may be used in at least one of the downlink (DL) and uplink (UL).

[0239] The wireless access method may also be called a waveform. In wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0240] In the wireless communication system 1, a Physical Downlink Shared Channel (PDSCH), a Broadcast Channel (PBCH), or a Physical Downlink Control Channel (PDCCH) may be used as the downlink channel, shared by each user terminal 20.

[0241] Furthermore, in the wireless communication system 1, the uplink channel may include a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), or the like, all of which are shared by each user terminal 20.

[0242] User data, higher-layer control information, and System Information Blocks (SIBs) are transmitted via PDSCH. User data and higher-layer control information may also be transmitted via PUSCH. Furthermore, Master Information Blocks (MIBs) may be transmitted via PBCH.

[0243] Lower-layer control information may be transmitted by PDCCH. The lower-layer control information may include, for example, Downlink Control Information (DCI) which includes scheduling information for at least one of PDSCH and PUSCH.

[0244] Furthermore, the DCI that schedules PDSCH may be called a DL assignment or DL ​​DCI, and the DCI that schedules PUSCH may be called a UL grant or UL DCI. Furthermore, PDSCH may be interpreted as DL data, and PUSCH may be interpreted as UL data.

[0245] PDCCH detection may utilize a Control Resource Set (CORESET) and a search space. A CORESET corresponds to the resources used to search for DCIs. A search space corresponds to the search area and search method for PDCCH candidates. A single CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with a particular search space based on the search space configuration.

[0246] A single search space may correspond to one or more PDCCH candidates corresponding to aggregation levels. One or more search spaces may be referred to as a search space set. In this disclosure, "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," and "CORESET configuration" may be interpreted interchangeably.

[0247] PUCCH may transmit uplink control information (UCI) which includes at least one of the following: channel state information (CSI), delivery acknowledgment (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). PRACH may transmit a random access preamble for establishing a connection with the cell.

[0248] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted from the names of various channels.

[0249] In wireless communication system 1, a synchronization signal (SS), downlink reference signal (DL-RS), and other signals may be transmitted. In wireless communication system 1, as DL-RS, a Cell-specific Reference Signal (CRS), Channel State Information Reference Signal (CSI-RS), DeModulation Reference Signal (DMRS), Positioning Reference Signal (PRS), Phase Tracking Reference Signal (PTRS), and other signals 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 SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that SS, SSB and the like may also be referred to as reference signals.

[0251] Furthermore, in the wireless communication system 1, as Uplink Reference Signal (UL-RS), a Sounding Reference Signal (SRS), DeModulation Reference Signal (DMRS), and other signals may be transmitted. Note that DMRS may also be referred to as a UE-specific Reference Signal.

[0252] (Base Station) FIG. 19 is a diagram illustrating an example configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may be provided.

[0253] Note that this example mainly illustrates functional blocks of characteristic portions in the present embodiment, and it may be assumed that the base station 10 also includes other functional blocks necessary for wireless communication. Part of the processing of each unit described below may be omitted.

[0254] The control unit 110 performs control of the entire base station 10. The control unit 110 can be configured from a controller, a control circuit, or the like as described based on common general knowledge in the technical field according to the present disclosure.

[0255] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), and the like. The control unit 110 may control transmission / reception, measurement, and the like using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140. The control unit 110 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the generated data, control information, sequence, and the like to the transmission / reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) for communication channels, state management of the base station 10, radio resource management, and the like.

[0256] The transmission / reception 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 transmission / reception unit 120 can be configured from a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, or the like as described based on common general knowledge in the technical field according to the present disclosure.

[0257] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 1211 and an RF unit 122. The receiving unit may consist of a receiving processing unit 1212, an RF unit 122 and a measuring unit 123.

[0258] The transmitting and receiving antenna 130 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0259] The transmitting / receiving unit 120 may transmit the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 may also receive the uplink channel, uplink reference signal, etc.

[0260] The transmitting / receiving unit 120 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0261] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform processing on data and control information acquired from the control unit 110, for example, at the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (e.g., RLC retransmission control), the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc., to generate a bit sequence to be transmitted.

[0262] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform transmission processing on the bit sequence to be transmitted, such as channel coding (which may include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT) processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, and digital-to-analog conversion, and output a baseband signal.

[0263] The transmitting / receiving unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 130.

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

[0265] The transmitting / receiving unit 120 (receiving processing unit 1212) may apply reception processing to the acquired baseband signal, such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data, etc.

[0266] The transmitting / receiving unit 120 (measurement unit 123) may perform measurements related to the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may also measure received power (e.g., Reference Signal Received Power (RSRP)), reception quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0267] The transmission path interface 140 may send and receive signals (backhaul signaling) with 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] In this disclosure, the transmitting and receiving units of the base station 10 may consist of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0269] The transmitting / receiving unit 120 may also transmit instruction information for multiple transmission setting instruction (TCI) states that are applied to multiple signals. Based on the instruction information, the transmitting / receiving unit 120 may apply the multiple TCI states to the signals that the terminal transmits and receives with multiple transmission / receiving points (TRPs), and receive the signals.

[0270] The control unit 110 may control transmission and reception of the transmission / reception 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 may be 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 different physical cell IDs (PCIs).

[0271] (User Terminal) FIG. 20 is a diagram illustrating an example configuration of a user terminal according to an embodiment. A user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. Note that one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided, respectively.

[0272] Note that in this example, functional blocks of characteristic portions in the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0273] The control unit 210 performs control of the entire user terminal 20. The control unit 210 can be constituted by a controller, a control circuit, or the like described based on common general knowledge in the technical field according to the present disclosure.

[0274] The control unit 210 may control signal generation, mapping, and the like. The control unit 210 may control transmission / reception, measurement, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, and the like to be transmitted as signals, and transfer the generated data, control information, sequences, and the like to the transmission / reception unit 220.

[0275] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0276] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may consist of a receiving processing unit 2212, an RF unit 222 and a measuring unit 223.

[0277] The transmitting and receiving antenna 230 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0278] The transmitting / receiving unit 220 may receive the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 220 may also transmit the uplink channel, uplink reference signal, etc.

[0279] The transmitting / receiving unit 220 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0280] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc., on data and control information acquired from the control unit 210, etc., to generate a bit sequence to be transmitted.

[0281] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform transmission processing on the bit sequence to be transmitted, such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion, and output a baseband signal.

[0282] Whether or not to apply DFT processing may be based on the transform precoding settings. The transmitting / receiving unit 220 (transmission processing unit 2211) may perform DFT processing as part of the transmission process to transmit a channel (for example, PUSCH) using a DFT-s-OFDM waveform if transform precoding is enabled for that channel, or it may not perform DFT processing as part of the transmission process if transform precoding is not enabled for that channel.

[0283] The transmitting / receiving unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 230.

[0284] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0285] The transmitting / receiving unit 220 (receiving processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0286] The transmitting / receiving unit 220 (measuring unit 223) may perform measurements related to the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, etc., based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0287] In this disclosure, the transmitting and receiving units of the user terminal 20 may consist of at least one of a transmitting / receiving unit 220 and a transmitting / receiving antenna 230.

[0288] The transmitting / receiving unit 220 may receive instruction information for multiple transmission setting instruction (TCI) states that are applied to multiple signals. The control unit 210 may apply the multiple TCI states to the signals transmitted and received by multiple transmission / receiving points (TRPs) based on the instruction information. Each of the multiple TCI states may be a TCI state that is applied to both downlink (DL) signals and uplink (UL) signals, or a TCI state that is applied to DL signals and a TCI state that is applied to UL signals. Each of the multiple TCI states may be associated with a different physical cell ID (PCI).

[0289] The transceiver 220 may receive one downlink control information (DCI) that schedules multiple physical downlink sharing channels (PDSCHs) from the multiple TRPs. At least one of the multiple TCI states may be associated with a PCI different from that of the serving cell.

[0290] The transmitting / receiving unit 220 may receive physical downlink shared channels (PDSCHs) from multiple TRPs using non-coherent joint transmission. The control unit 210 may select one TRP from the multiple TRPs based on the TCI state indicated by at least one of the downlink control information (DCI) and the Medium Access Control Control Element (MAC CE).

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

[0292] (Hardware configuration) The block diagrams used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining the above one device or the above multiple devices with software.

[0293] Here, functions include, but are not limited to, judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission may be called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

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

[0295] In this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or it may be configured without some of the devices.

[0296] For example, although only one processor 1001 is shown in the diagram, there may be multiple processors. Furthermore, processing may be performed by one processor, or by two or more processors simultaneously, sequentially, or by other means. Note that processor 1001 may be implemented using one or more chips.

[0297] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations and control communication via the communication device 1004, or to control at least one of the reading and writing of data in the memory 1002 and storage 1003.

[0298] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, at least a part of the control unit 110 (210) and the transmitting / receiving unit 120 (220) described above may be implemented by the processor 1001.

[0299] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be implemented similarly.

[0300] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. Memory 1002 may also be called a register, cache, or main memory. Memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of this disclosure.

[0301] Storage 1003 is a computer-readable recording medium and may consist of at least one of the following: a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (Compact Disc ROM (CD-ROM)), a digital multipurpose disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be called an auxiliary storage device.

[0302] The communication device 1004 is hardware (transmitting / receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitting / receiving unit 120 (220), transmitting / receiving antenna 130 (230), etc., may be implemented by the communication device 1004. The transmitting / receiving unit 120 (220) may be implemented with physically or logically separated implementations of a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0303] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, light-emitting diode (LED) lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0304] Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[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), and a field programmable gate array (FPGA), and some or all of each functional block may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0306] (modified version) In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Also, a signal may be a message. A reference signal may be abbreviated as RS and may be called a pilot, pilot signal, etc., depending on the applicable standard. Also, a component carrier (CC) may be called a cell, frequency carrier, carrier frequency, etc.

[0307] A wireless frame may consist of one or more periods (frames) in the time domain. Each of these periods (frames) constituting a wireless frame may be called a subframe. Furthermore, a subframe may consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0308] Here, the neuralelogy may be communication parameters applied to at least one of the transmission and reception of a signal or channel. The neuralelogy may be, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, or specific windowing processes performed by the transceiver in the time domain.

[0309] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). Alternatively, a slot may be a time unit based on neurology.

[0310] A slot may include multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Mini-slots may also be called sub-slots. Mini-slots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (PUSCH) mapping type B.

[0311] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Wireless frames, subframes, slots, minislots, and symbols may each be referred to by different names. Furthermore, the units of time such as frames, subframes, slots, minislots, and symbols in this disclosure may be interpreted as interchangeable.

[0312] For example, one subframe may be called TTI, multiple consecutive subframes may be called TTI, or one slot or one mini-slot may be called TTI. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Note that the unit representing TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0313] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0314] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0315] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0316] A TTI with a time length of 1 ms may also be called a normal TTI (TTI in 3GPP Rel.8-12), a long TTI, a normal subframe, a long subframe, or a slot. A TTI shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini slot, a sub slot, or a slot.

[0317] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0318] A Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0319] Furthermore, an RB may contain one or more symbols in the time domain and may have the length of one slot, one minislot, one subframe, or one TTI. Each TTI, subframe, etc., may consist of one or more resource blocks.

[0320] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0321] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0322] A Bandwidth Part (BWP) (also called a partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs may be defined and numbered within a BWP.

[0323] A BWP may include UL BWPs (BWPs for UL) and DL BWPs (BWPs for DL). One or more BWPs may be configured within a single carrier for a UE.

[0324] At least one of the configured BWPs may be active, and the UE does not need to assume that it will send or receive a given signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0325] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative examples. For instance, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots within a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0326] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or corresponding other information. For example, wireless resources may be indicated by a predetermined index.

[0327] The names used for parameters and other elements in this disclosure are not restrictive in any way. Furthermore, mathematical formulas and other elements that use these parameters may differ from those expressly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0328] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0329] Furthermore, information, signals, etc., can be output from upper layers to lower layers and from lower layers to upper layers, or to at least one of the two. Information, signals, etc., may also be input and output via multiple network nodes.

[0330] Input and output information and signals may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information and signals may be overwritten, updated, or appended to. Output information and signals may be deleted. Input information and signals may be transmitted to other devices.

[0331] Information notification is not limited to the embodiments described herein and may be carried out by other means. For example, information notification in this disclosure may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof).

[0332] Physical layer signaling may also be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. RRC signaling may also be called RRC messages, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc. MAC signaling may also be communicated using, for example, MAC Control Element (CE).

[0333] Furthermore, notification of the specified information (for example, notification that "X is the case") is not limited to explicit notification, but may also be made implicitly (for example, by not providing notification of the specified information or by providing notification of other information).

[0334] The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value represented as true or false, or by a numerical comparison (for example, a comparison with a predetermined value).

[0335] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0336] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0337] The terms “system” and “network” as used in this disclosure may be used interchangeably. “Network” may also mean the equipment included in the network (e.g., base stations).

[0338] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "quasi-co-location (QCL)," "transmission configuration indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," and "panel" may be used interchangeably.

[0339] In this disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0340] A base station can house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0341] In this disclosure, the transmission of information by a base station to a terminal may be interpreted as the base station instructing the terminal to perform a control / operation based on said information.

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

[0343] A mobile station may also be called a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate term.

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

[0345] The term "mobile object" refers to any movable object, regardless of its speed, and naturally includes cases where the mobile object is stationary. Examples of such mobile objects include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and items carried on them. Furthermore, such mobile objects may be autonomously driven objects operating based on operational commands.

[0346] The mobile entity may be a vehicle (e.g., a car, an airplane), an unmanned mobile entity (e.g., a drone, an autonomous vehicle), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0347] Figure 22 shows an example of a vehicle according to one embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, a pneumatic pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0348] The drive unit 41 consists of, for example, at least one of an engine, a motor, or an engine-motor hybrid. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

[0349] The electronic control unit 49 consists of a microprocessor 61, memory (ROM, RAM) 62, and communication ports (e.g., input / output (IO) ports) 63. Signals from various sensors 50-58 installed in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0350] Signals from various sensors 50-58 include current signals from current sensor 50 for sensing motor current, rotational speed signals of front wheels 46 / rear wheels 47 acquired by rotational speed sensor 51, air pressure signals of front wheels 46 / rear wheels 47 acquired by air pressure sensor 52, vehicle speed signals acquired by vehicle speed sensor 53, acceleration signals acquired by acceleration sensor 54, accelerator pedal depression signal of accelerator pedal 43 acquired by accelerator pedal sensor 55, brake pedal depression signal of brake pedal 44 acquired by brake pedal sensor 56, operation signals of shift lever 45 acquired by shift lever sensor 57, and detection signals for detecting obstacles, vehicles, pedestrians, etc., acquired by object detection sensor 58.

[0351] The information service unit 59 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, displays, television, and radio, and one or more ECUs that control these devices. The information service unit 59 uses information acquired from external devices via a communication module 60 or the like to provide various types of information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0352] The information service unit 59 may include input devices that accept input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) and output devices that perform output to the outside (e.g., display, speaker, LED lamp, touch panel, etc.).

[0353] The driver assistance system unit 64 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Unit (IMU), Inertial Navigation System (INS)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driver assistance functions or autonomous driving functions.

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

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

[0356] The communication module 60 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 59. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above input.

[0357] The communication module 60 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 59 installed in the vehicle. The information service unit 59 may also be called an output unit, which outputs information (for example, it outputs information to devices such as displays and speakers based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 60).

[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, axle 48, various sensors 50-58, etc., which are provided in the vehicle 40.

[0359] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, uplink channel and downlink channel may be interpreted as sidelink channel.

[0360] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station 10 may be configured to have the same functions as the user terminal 20 described above.

[0361] In this disclosure, operations performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes with base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0362] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be rearranged in order, provided they are consistent. For example, the methods described in this disclosure present various step elements in an exemplary order and are not limited to that specific order.

[0363] Each aspect / embodiment described in this disclosure includes Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (where x is, for example, an integer or decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM®), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), and IEEE This may apply to systems utilizing 802.20, Ultra-WideBand (UWB), Bluetooth®, or other appropriate wireless communication methods, as well as next-generation systems that are extended, modified, created, or defined based on these. It may also apply to combinations of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0364] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0365] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, the references to the first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.

[0366] The term “determining” as used in this disclosure may encompass a wide variety of actions. For example, “determining” may be considered to include judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in tables, databases, or other data structures), ascertaining, etc.

[0367] Furthermore, "judgment (decision)" may be considered as "judging (deciding)" things like receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory).

[0368] Furthermore, "judgment (decision)" can be considered as "judging (deciding)" something like resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can be considered as "judging (deciding)" something about an action.

[0369] Furthermore, "judgment (decision)" can be replaced with "assuming," "expecting," or "considering."

[0370] The term "maximum transmit power" as used in this disclosure may mean the maximum transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0371] As used in this disclosure, the terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be replaced with “access.”

[0372] In this disclosure, when two elements are connected, they can be considered to be “connected” or “coupled” to each other using one or more wires, cables, printed electrical connections, etc., and, in some non-exclusive and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, or optical domain (both visible and invisible).

[0373] In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combine" may be interpreted similarly to "different."

[0374] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0375] In this disclosure, if articles are added by translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0376] In this disclosure, terms such as "less than or equal to," "less than," "greater than or equal to," "more than," and "equal to" may be interpreted interchangeably. In addition, in this disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "early," "slow," "wide," and "narrow" may be interpreted interchangeably, not limited to the positive, comparative, and superlative degrees. Furthermore, in this disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "early," "slow," "wide," and "narrow" may be interpreted interchangeably, not limited to the positive, comparative, and superlative degrees, by adding "i-th" (where i is any integer) to the expression (for example, "highest" may be interpreted interchangeably with "i-th highest").

[0377] In this disclosure, "of," "for," "regarding," "related to," and "associated with" may be interpreted as being interchangeable.

[0378] Although the invention described herein has been explained in detail above, it will be clear to those skilled in the art that the invention described herein is not limited to the embodiments described herein. The invention described herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined in the claims. Therefore, the descriptions herein are for illustrative purposes only and do not imply any limitation on the invention described herein.< / trs>

Claims

1. A receiving unit that receives information about multiple cells and receives instructions on the transmission configuration instruction (TCI) status of candidate serving cells before switching serving cells, A terminal having a control unit that switches the serving cell based on the TCI state and a Medium Access Control Control Element (MAC CE) for cell switching.

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

3. The terminal according to claim 1, further comprising a transmitter that reports the ability to support at least one of the following TCI states: a joint TCI state, a DL TCI state, and a UL TCI state.

4. The process includes receiving information about multiple cells and receiving instructions on the transmission configuration instruction (TCI) status of candidate serving cells before switching serving cells, A wireless communication method for a terminal, comprising the steps of switching the serving cell based on the TCI state and a Medium Access Control Control Element (MAC CE) for cell switching.

5. A transmission unit that transmits information about multiple cells and transmits instructions for the transmission configuration instruction (TCI) status of candidate serving cells before switching serving cells, A base station having a control unit that instructs the switching of the serving cell based on the TCI state and a Medium Access Control Control Element (MAC CE) for cell switching.

6. A system having a terminal and a base station, The terminal includes a receiving unit that receives information about multiple cells and receives instructions on the transmission configuration instruction (TCI) status of candidate serving cells before switching serving cells, The system includes 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 transmitting unit that transmits information about the plurality of cells and transmits the instructions, A system comprising: a control unit that instructs the switching of the serving cell based on the TCI state and the cell switching MAC CE.

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