Terminals, wireless communication methods, base stations and systems

Abstract

A terminal according to an aspect disclosed herein comprises: a control unit that determines a Quasi-Co-Location (QCL) assumption to be applied to a channel state information reference signal (CSI-RS), when one or more control resource sets and the CSI-RS are configured to at least partially overlap in a time domain, the QCL assumption being determined on the basis of a Transmission Configuration Indication (TCI) state associated with a specific control resource set among the one or more control resource sets; and a reception unit that receives the CSI-RS to which the QCL assumption has been applied. According to the aspect disclosed herein, it is possible to appropriately determine the QCL of a specific reference signal.

Description

Technical Field

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

Background Art

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) was specified for the purpose of further high data rates, low latency, etc. (Non-Patent Document 1). Also, for the purpose of further large capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9), LTE-Advanced (3GPP Rel. 10-14) was specified.

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

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

[0005] In future wireless communication systems (e.g., NR), there is a consideration to configure a physical downlink control channel (PDCCH) reception method for the control resource set (CORESET) for higher reliability and faster movement.

[0006] However, in some cases, the determination of quasi-co-location (QCL) for specific reference signals (e.g., Channel State Information Reference Signal (CSI-RS)) is not sufficiently considered at the terminal (user terminal, User Equipment (UE)). If this consideration is insufficient, it may lead to a decrease in communication quality and throughput.

[0007] Therefore, this disclosure provides a terminal and wireless communication method for appropriately determining the QCL of a specific reference signal. 、 base station and system One of the objectives is to provide [this]. [Means for solving the problem]

[0008] A terminal according to one aspect of this disclosure includes a control unit that determines to apply a specific TCI state from among the multiple TCI states to the CSI-RS when multiple downlink (DL) signals corresponding to multiple Transmission Configuration Indication (TCI) states and a Channel Status Information Reference Signal (CSI-RS) overlap in the time domain, and a receiving unit that receives the CSI-RS to which the specific TCI state has been applied. A transmission unit that reports capability information indicating that it supports the determination of the specific TCI state, to have Furthermore, the aforementioned multiple DL signals correspond to multiple physical downlink sharing channels (PDSCHs) scheduled with an offset greater than or equal to the threshold reported by the terminal. do. [Effects of the Invention]

[0009] According to one aspect of the present disclosure, the QCL of a specific reference signal can be appropriately determined.

Brief Description of the Drawings

[0010] [Figure 1] FIGS. 1A and 1B are diagrams showing an example of communication between a mobile body and a transmission point (for example, RRH). [Figure 2] FIGS. 2A to 2C are diagrams showing an example of schemes 0 to 2 regarding SFN. [Figure 3] FIGS. 3A and 3B are diagrams showing an example of scheme 1. [Figure 4] FIGS. 4A to 4C are diagrams showing an example of a Doppler pre-compensation scheme. [Figure 5] FIGS. 5A and 5B are diagrams showing an example of the TCI state of CSI-RS according to the first embodiment. [Figure 6] FIG. 6 is a diagram showing an example of the TCI state of CSI-RS according to a modification of the first embodiment. [Figure 7] FIG. 7 is a diagram showing an example of the determination of the default QCL according to Embodiment 2-2-1. [Figure 8] FIG. 8 is a diagram showing an example of the determination of the default QCL according to Embodiment 2-2-2. [Figure 9] FIG. 9 is a diagram showing an example of the determination of the default QCL according to Embodiment 2-2-3. [Figure 10] FIGS. 10A to 10C are diagrams showing an example of the overlap between A-CSI-RS and other DL signals. [Figure 11] FIG. 11 is a diagram showing an example of the schematic configuration of a wireless communication system according to an embodiment. [Figure 12] FIG. 12 is a diagram showing an example of the configuration of a base station according to an embodiment. [Figure 13] FIG. 13 is a diagram showing an example of the configuration of a user terminal according to an embodiment. [Figure 14] FIG. 14 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. [Figure 15] FIG. 15 is a diagram showing an example of a vehicle according to an embodiment.

Embodiments for Carrying Out the Invention

[0011] (TCI, Spatial Relation, QCL) In NR, it has been considered to control at least one of reception processing (e.g., at least one of reception, demapping, demodulation, decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, encoding) in a UE for at least one of a signal and a channel (expressed as a signal / channel) based on a transmission configuration indication state (Transmission Configuration Indication state (TCI state)).

[0012] The TCI state may represent what is applied to a downlink signal / channel. What corresponds to the TCI state applied to an uplink signal / channel may be expressed as a spatial relation.

[0013] The TCI state is information regarding quasi-co-location (Quasi-Co-Location (QCL)) of a signal / channel, and may be called a spatial reception parameter, spatial relation information, etc. The TCI state may be set for each UE for each channel or each signal.

[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] Physical layer signaling may include, for example, Downlink Control Information (DCI).

[0021] 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).

[0022] 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).

[0023] 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.

[0024] 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.

[0025] (PassLoss RS) Path loss PL in the transmit power control of PUSCH, PUCCH, and SRS b,f,c (q d )[dB] is the index q of the reference signal (RS, PathlossReferenceRS) for the downlink BWP associated with the active UL BWP b of carrier f of serving cell c. d It is calculated by UE using the following: pathloss reference RS, pathloss(PL)-RS, index q dIn this disclosure, "RS used in path loss calculation" and "RS resource used in path loss calculation" may be interpreted as mutually exclusive.

[0026] When the path loss RS is updated by MAC CE, consideration is being given to whether or not to modify the existing mechanism of the higher layer filtered RSRP (higher layer filtered RSRP) used for path loss measurement.

[0027] When the path loss RS is updated by MAC CE, path loss measurement based on L1-RSRP may be applied. At any available timing after MAC CE for updating the path loss RS, the upper layer filter RSRP may be used for path loss measurement, and L1-RSRP may be used for path loss measurement before the upper layer filter RSRP is applied. At any available timing after MAC CE for updating the path loss RS, the upper layer filter RSRP may be used for path loss measurement, and the upper layer filter RSRP of the previous path loss RS may be used before that timing. Similar to the operation of Rel.15, the upper layer filter RSRP may be used for path loss measurement, and the UE may track all path loss RS candidates set by RRC. The maximum number of path loss RS that can be set by RRC may depend on the UE capability. If the maximum number of path loss RS that can be set by RRC is X, then path loss RS candidates up to X may be set by RRC, and a path loss RS may be selected by MAC CE from among the set path loss RS candidates. The maximum number of path loss RS that can be set by RRC may be 4, 8, 16, 64, etc.

[0028] In this disclosure, the terms upper-layer filter RSRP, filtered RSRP, and layer 3 filtered RSRP may be interpreted interchangeably.

[0029] (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.

[0030] 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.

[0031] 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.

[0032] 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).

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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).

[0041] 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.

[0042] 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).

[0043] 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.

[0044] 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.

[0045] 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.

[0046] Rel.15 / 16 specifies the default spatial relationships and default PL-RS for PUSCH / PUCCH / SRS, respectively.

[0047] (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.

[0048] 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.

[0049] 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.

[0050] 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).

[0051] 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.

[0052] 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).

[0053] Multiple PDSCHs from a multi-TRP (sometimes called multiple PDSCHs) may be scheduled using a single DCI (single DCI, single PDCCH) (single-master mode, single-DCI based multi-TRP). Multiple PDSCHs from a multi-TRP may each be scheduled using multiple DCIs (multi-DCI, multiple PDCCH) (multi-master mode, multi-DCI based multi-TRP).

[0054] In Ultra-Reliable and Low Latency Communications (URLLC) for multiple TRPs, support for PDSCH (Transport Block (TB) or Codeword (CW)) repetition across multiple TRPs is being considered. Support for repetition schemes (URLLC schemes, reliability enhancement schemes, e.g., schemes 1a, 2a, 2b, 3, 4) across multiple TRPs in the frequency domain, layer (spatial) domain, or time domain is being considered. In scheme 1a, 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, multi-PDSCH signals from multiple TRPs are transmitted using time-division multiplexing (TDM). In scheme 3, multi-PDSCH signals from multiple TRPs are transmitted within a single slot. In scheme 4, multi-PDSCH signals from multiple TRPs are transmitted within different slots.

[0055] Such multi-TRP scenarios allow for more flexible transmission control using high-quality channels.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] (Multi-TRP PDCCH) To assess the reliability of multi-TRP PDCCHs based on non-single-frequency networks (SFNs), the following considerations 1 to 3 have been examined. [Consideration 1] Encoding / rate matching is based on one repetition, and the same encoded bits are repeated in other repetitions. [Consideration 2] Each iteration has the same number of control channel elements (CCEs), the same encoded bits, and corresponds to the same DCI payload. [Consideration 3] Two or more PDCCH candidates are explicitly linked to each other. The UE knows the link before decryption.

[0061] The following options 1-2, 1-3, 2, and 3 are being considered for PDCCH repetition.

[0062] [Options 1-2] Two sets of PDCCH candidates (within a given search space (SS) set) are associated with two TCI states in the CORESET, respectively. Here, the same CORESET, the same SS set, and PDCCH iterations in different monitoring occasions are used.

[0063] [Options 1-3] Two sets of PDCCH candidates are associated with two SS sets, respectively. Both SS sets are associated with a CORESET, and each SS set is associated with only one TCI state of that CORESET. Here, the same CORESET and two SS sets are used.

[0064] [Option 2] One SS set is associated with two different CORESETs.

[0065] [Option 3] Two SS sets are associated with two CORESETs, respectively.

[0066] Thus, it is being considered that two PDCCH candidates within two SS sets for PDCCH iterations are supported, and that the two SS sets are explicitly linked.

[0067] (SFN PDCCH) For PDCCH / CORESET as defined in Rel.15, one TCI state without a CORESET Pool Index (CORESETPoolIndex) (also known as TRP Info) is set for one CORESET.

[0068] Regarding the PDCCH / CORESET enhancements specified in Rel.16, in multi-TRP based on multi-DCI, a CORESET pool index is set for each CORESET.

[0069] Since Rel.17, the following enhancements 1 and 2 regarding PDCCH / CORESET have been considered.

[0070] In cases where multiple antennas (small antennas, transmit / receive points) with the same cell ID form a single frequency network (SFN), up to two TCI states can be set / activated for a single CORESET using upper-layer signaling (RRC signaling / MAC CE) (Enhancement 1). The SFN contributes to at least one of the operation and reliability improvements of the HST (high-speed train).

[0071] Furthermore, in repeated transmissions of PDCCH (which may simply be called "repetition"), two PDCCH candidates in two search space sets are linked, and each search space set is associated with a corresponding CORESET (Enhancement 2). The two search space sets may be associated with the same or different CORESETs. For a single CORESET, one (at most one) TCI state may be set / activated by upper-layer signaling (RRC signaling / MAC CE).

[0072] If two search space sets are associated with different coresets having different TCI states, this may mean a multi-TRP repetition. If two search space sets are associated with the same coreset (a coreset with the same TCI state), this may mean a single-TRP repetition.

[0073] (HST) In LTE, the placement of HST (high-speed train) antennas in tunnels is challenging. Large antennas transmit both inside and outside the tunnel. For example, the transmission power of a large antenna is around 1 to 5W. For handover purposes, it is important for the UE to transmit outside the tunnel before entering it. For example, the transmission power of a small antenna is around 250mW. Multiple small antennas (transmitting and receiving points) with the same cell ID and a distance of 300m form a single frequency network (SFN). All small antennas within the SFN transmit the same signal on the same PRB at the same time. It is assumed that the terminal transmits and receives to a single base station. In reality, multiple transmitting and receiving points transmit the same DL signal. During high-speed movement, transmitting and receiving points spanning several kilometers form a single cell. Handover occurs when crossing cells. This can reduce the frequency of handovers.

[0074] NR is expected to utilize beams transmitted from a transmission point (e.g., RRH) to communicate with terminals (hereinafter also referred to as UEs) contained within high-speed moving objects such as trains (HSTs). Existing systems (e.g., Rel.15) support the transmission of a unidirectional beam from the RRH to communicate with moving objects (see Figure 1A).

[0075] Figure 1A shows a case where RRHs are installed along the movement path (or direction of movement, direction of travel, or travel path) of a moving object, and a beam is formed from each RRH toward the direction of travel of the moving object. RRHs that form a beam in one direction may also be called unidirectional RRHs. In the example shown in Figure 1A, the moving object has a negative Doppler shift (-f) from each RRH. D )

[0076] Here, we show a case where the beam is formed on the side in the direction of travel of the moving object, but this is not limited to this case. The beam may be formed on the side opposite to the direction of travel, or it may be formed in any direction regardless of the direction of travel of the moving object.

[0077] From Rel.16 onwards, it is anticipated that multiple beams (e.g., two or more) may be transmitted from the RRH. For example, beams may be formed in both the direction of the moving object's movement and the opposite direction (see Figure 1B).

[0078] Figure 1B shows a case where RRHs are installed along the movement path of a moving object, and beams are formed from each RRH both in the direction of the object's movement and in the opposite direction of its movement. An RRH that forms beams in multiple directions (e.g., two directions) may also be called a bidirectional RRH.

[0079] In this HST, the UE communicates in the same way as a single TRP. In base station implementations, transmission can be made from multiple TRPs (same cell ID).

[0080] In the example in Figure 1B, when two RRHs (here, RRH#1 and RRH#2) use SFN, the moving object switches from a signal with a negative Doppler shift to a signal with a positive Doppler shift, where the power is higher, midway between the two RRHs. In this case, the maximum range of Doppler shift that requires correction is -f D from +f D This represents a change to a 2x increase compared to the case of unidirectional RRH.

[0081] In this disclosure, a positive Doppler shift may be interpreted as information relating to a positive Doppler shift, a Doppler shift in the positive direction, or Doppler information in the positive direction. Similarly, a negative Doppler shift may be interpreted as information relating to a negative Doppler shift, a Doppler shift in the negative direction, or Doppler information in the negative direction.

[0082] Here, we compare the following schemes for HST, from Scheme 0 to Scheme 2 (HST Scheme 0 to HST Scheme 2).

[0083] In Scheme 0 of Figure 2A, the tracking reference signal (TRS), DMRS, and PDSCH are transmitted to two TRPs (RRHs) in common (using the same time and frequency resources) (normal SFN, transparent SFN, HST-SFN).

[0084] In Scheme 0, since the UE receives DL channels / signals with a single TRP equivalent, the TCI state of the PDSCH is 1.

[0085] Furthermore, Rel.16 specifies RRC parameters for distinguishing between transmissions using single TRP and transmissions using SFN. When a UE reports the corresponding UE capability information, it may distinguish between receiving a single TRP DL channel / signal and receiving a PDSCH assuming SFN based on these RRC parameters. On the other hand, a UE may perform transmission and reception using SFN while assuming a single TRP.

[0086] In Scheme 1 of Figure 2B, TRS is transmitted TRP-specifically (using different time / frequency resources depending on the TRP). In this example, TRS1 is transmitted from TRP#1 and TRS2 is transmitted from TRP#2.

[0087] In Scheme 1, the UE receives DL channels / signals from each TRP using the TRS from each TRP, so there are two TCI states for the PDSCH.

[0088] In Scheme 2 of Figure 2C, TRS and DMRS are transmitted specifically by the TRP. In this example, TRS1 and DMRS1 are transmitted from TRP#1, and TRS2 and DMRS2 are transmitted from TRP#2. Compared to Scheme 0, Schemes 1 and 2 can suppress abrupt changes in Doppler shift and appropriately estimate / compensate for the Doppler shift. Since the DMRS in Scheme 2 is higher than that in Scheme 1, the maximum throughput of Scheme 2 is lower than that of Scheme 1.

[0089] In Scheme 0, the UE switches between single TRP and SFN based on upper-layer signaling (RRC information element / MAC CE).

[0090] The UE may switch between Scheme 1 / Scheme 2 / NW pre-compensation schemes based on upper-layer signaling (RRC information elements / MAC CE).

[0091] In Scheme 1, two TRS resources are configured for the direction of travel of the HST and its opposite direction.

[0092] In the example in Figure 3A, TRPs (TRP#0, #2, ...) that transmit DL signals in the reverse direction of the HST transmit the first TRS (TRS arriving in front of the HST) on the same time and frequency resource (SFN). TRPs (TRP#1, #3, ...) that transmit DL signals in the direction of the HST transmit the second TRS (TRS arriving behind the HST) on the same time and frequency resource (SFN). The first and second TRSs may be transmitted / received using different frequency resources.

[0093] In the example shown in Figure 3B, TRS1-1 to 1-4 are transmitted as the first TRS, and TRS2-1 to 2-4 are transmitted as the second TRS.

[0094] Considering beam operation, the first TRS is transmitted using 64 beams and 64 time resources, and the second TRS is transmitted using 64 beams and 64 time resources. The beams of the first TRS and the beams of the second TRS are considered to be equal (equal QCL type D RS). Resource utilization efficiency can be increased by multiplexing the first and second TRS on the same time resources and different frequency resources.

[0095] In the example shown in Figure 4A, RRHs #0-#7 are positioned along the HST's travel path. RRHs #0-#3 and #4-#7 are connected to baseband units (BBUs) #0 and #1, respectively. Each RRH is a bidirectional RRH, forming a beam using each transmission / reception point (TRP) in both the direction of travel and the reverse direction of the travel path.

[0096] In the received signal of the example in Figure 4B (single TRP (SFN) / scheme 1), when the UE receives a signal / channel transmitted from TRP#2n-1 (where n is a non-negative integer) (the beam in the direction of travel of the HST, the beam coming from behind the UE), a negative Doppler shift (in this example, -fD) occurs. Conversely, when the UE receives a signal / channel transmitted from TRP#2n (where n is a non-negative integer) (the beam in the opposite direction of travel of the HST, the beam coming from in front of the UE), a positive Doppler shift (in this example, +fD) occurs.

[0097] Since Rel.17, base stations have been considering implementing Doppler pre-compensation schemes (Pre-Doppler Compensation scheme, Doppler pre-Compensation scheme, Network (NW) pre-compensation scheme, HST NW pre-compensation scheme, TRP pre-compensation scheme, TRP-based pre-compensation scheme) when transmitting downlink (DL) signals / channels from the TRP to the UE via the HST. By performing Doppler compensation in advance when transmitting DL signals / channels to the UE, the TRP can reduce the impact of Doppler shift when receiving DL signals / channels at the UE. In this disclosure, the Doppler pre-compensation scheme may be a combination of Scheme 1 and pre-compensation of Doppler shift by the base station.

[0098] In the Doppler pre-compensation scheme, it is being considered that TRSs from each TRP will be transmitted without Doppler pre-compensation, while PDSCHs from each TRP will be transmitted with Doppler pre-compensation.

[0099] In the Doppler pre-compensation scheme, TRPs that form a beam on the direction of travel of the travel path and TRPs that form a beam on the opposite direction of travel of the travel path perform Doppler correction before transmitting DL signals / channels to UEs in the HST. In this example, TRP#2n-1 performs positive Doppler correction, and TRP#2n performs negative Doppler correction, thereby reducing the effect of Doppler shift when the UE receives the signal / channel (Figure 4C).

[0100] In the situation shown in Figure 4C, since the UE receives DL channels / signals from each TRP using the TRS from each TRP, the TCI state of the PDSCH may be two.

[0101] Furthermore, in Rel.17 and later, dynamic switching between single TRP and SFN using the TCI field (TCI state field) is being considered. For example, using the RRC information element / MAC CE (e.g., Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE) / DCI (TCI field), one or two TCI states are set / indicated for each TCI code point (code point in the TCI field, DCI code point). When one TCI state is set / indicated, the UE may determine that it is receiving a single TRP PDSCH. Alternatively, when two TCI states are set / indicated, the UE may determine that it is receiving an SFN PDSCH using multiple TRPs.

[0102] (analysis) Since Rel.17, regarding PDCCH repetition, the QCL assumptions for QCL type D of a CSI-RS have been examined when multiple CORESETs of different QCL type D overlap with a CSI-RS where the repetition setting (upper layer parameter "repetition") is not set to "on".

[0103] More specifically, the following are being considered: Regarding CSI-RS associated with a non-zero power (NZP) CSI-RS resource set (higher layer parameter "NZP-CSI-RS-ResourceSet") where the higher layer parameter "repetition" is set to "on", the UE does not expect CSI-RS to be set in symbols while the UE is configured to monitor CORESET. For any other NZP CSI-RS resource set configurations ("NZP-CSI-RS-ResourceSet"), when a CORESET (and its associated search space (SS) set) and CSI-RS are configured in the same symbol, the UE assumes, if "type D" is applicable, that the DMRS for PDCCH sent in that CORESET (and all associated search space (SS) sets) and the CSI-RS are quasi-co-located with type D.

[0104] However, there has been insufficient consideration of how to determine the QCL assumption for CSI-RS when there are multiple CORESETs (TCI states / QCLs) that overlap with CSI-RS in the time domain.

[0105] Furthermore, there has been insufficient consideration of how to determine the QCL assumption for a CSI-RS when there is overlap between a specific CSI-RS (e.g., aperiodic (A-) CSI-RS) and the PDCCH defined in Rel. 17 and later.

[0106] If these considerations are not sufficient, it may lead to a decrease in communication quality, throughput, and other problems.

[0107] Therefore, the inventors conceived a method for appropriately determining the QCL of a specific reference signal (e.g., CSI-RS).

[0108] 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.

[0109] In this disclosure, “A / B / C” and “at least one of A, B, and C” may be interpreted as mutually exclusive. In this disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be interpreted as mutually exclusive. In this disclosure, index, ID, indicator, and resource ID may be interpreted as mutually exclusive. In this disclosure, sequence, list, set, group, cluster, subset, etc. may be interpreted as mutually exclusive. In this disclosure, support, control, controllable, operate, and operable may be interpreted as mutually exclusive.

[0110] In this disclosure, configure, activate, update, indicate, enable, specify, and select may be interpreted as interchangeable.

[0111] In this disclosure, higher-layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof. In this disclosure, RRC, RRC signaling, RRC parameters, higher layer, higher-layer parameters, RRC information elements (IE), RRC messages, and settings may be interpreted as mutually exclusive.

[0112] MAC signaling may use, for example, MAC Control Elements (MAC CEs) or MAC Protocol Data Units (PDUs). In this disclosure, MAC CEs, update commands, and activation / deactivation commands may be interpreted as interchangeable.

[0113] Broadcast information may include, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI, SIB1), and Other System Information (OSI).

[0114] In this disclosure, beam, spatial domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, TCI assumption, QCL assumption, QCL parameter, spatial domain receive filter, UE spatial domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS of QCL type D in TCI state / QCL assumption, RS of QCL type A in TCI state / QCL assumption, spatial relationship, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, and PL-RS may be interpreted as each other. In this disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS having QCL type X, DL-RS source, SSB, CSI-RS, and SRS may be interpreted as each other.

[0115] 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), base station, antenna port for a signal (e.g., Demodulation Reference Signal (DMRS) port), DMRS, antenna port group for a signal (e.g., DMRS port group), group for multiplexing (e.g., Code Division Multiplexing (CDM) group, reference signal group, CORESET group), and Physical Uplink Control. The following terms may be interchangeable: Channel (PUCCH) group, PUCCH resource group, resource (e.g., reference signal resource, SRS resource), resource set (e.g., reference signal resource set), CORESET pool, CORESET subset, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, quasi-co-location (QCL), QCL assumption, redundancy version (RV), and layers (multi-input multi-output (MIMO) layer, transmit layer, spatial layer).Furthermore, Panel Identifier (ID) and Panel may be interpreted as interchangeable. In this disclosure, TRP ID and TRP may be interpreted as interchangeable.

[0116] The panel may be associated with at least one of the following: a group index for SSB / CSI-RS groups, a group index for group-based beam reporting, or a group index for SSB / CSI-RS groups for group-based beam reporting.

[0117] Furthermore, the panel identifier (ID) and the panel may be interchangeable. In other words, TRP ID and TRP, CORESET group ID and CORESET group, etc., may be interchangeable.

[0118] In this disclosure, TRP, transmit point, panel, DMRS port group, CORESET pool, and one of two TCI states associated with one code point in the TCI field may be interpreted as one another.

[0119] In this disclosure, a single PDCCH (DCI) may be assumed to be supported when multiple TRPs utilize an ideal backhaul. Multiple PDCCH (DCI) may be assumed to be supported when multiple TRPs utilize a non-ideal backhaul.

[0120] 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.

[0121] In this disclosure, single TRP, single TRP system, single TRP transmission, and single PDSCH may be interpreted as mutually exclusive. In this disclosure, multi-TRP, multi-TRP system, multi-TRP transmission, and multi-PDSCH may be interpreted as mutually exclusive. In this disclosure, single DCI, single PDCCH, multi-TRP based on single DCI, and activating two TCI states on at least one TCI code point may be interpreted as mutually exclusive.

[0122] In this disclosure, the following can be interpreted interchangeably: single TRP, channel using single TRP, channel using one TCI state / spatial relationship, multi-TRP not being enabled by RRC / DCI, multiple TCI state / spatial relationships not being enabled by RRC / DCI, no CORESET pool index value of 1 being set for any CORESET, and no code point in a TCI field being mapped to two TCI states.

[0123] In this disclosure, multi-TRP, channels using multi-TRP, channels using multiple TCI state / spatial relationships, multi-TRP being enabled by RRC / DCI, multiple TCI state / spatial relationships being enabled by RRC / DCI, and at least one of a single-DCI-based multi-TRP and a multi-DCI-based multi-TRP may be interpreted as mutually exclusive. In this disclosure, multi-DCI-based multi-TRP and a CORESET pool index (CORESETPoolIndex) value of 1 is set for a CORESET may be interpreted as mutually exclusive. In this disclosure, single-DCI-based multi-TRP and at least one code point of a TCI field being mapped to two TCI states may be interpreted as mutually exclusive.

[0124] In this disclosure, TRP#1 (first TRP) may correspond to CORESET pool index = 0, or to the first of two TCI states corresponding to one code point in the TCI field. TRP#2 (second TRP) TRP#1 (first TRP) may correspond to CORESET pool index = 1, or to the second of two TCI states corresponding to one code point in the TCI field.

[0125] In this disclosure, single DCI (sDCI), single PDCCH, multi-TRP system based on single DCI, sDCI-based MTRP, and activation of two TCI states on at least one TCI code point may be interpreted as mutually exclusive.

[0126] In this disclosure, the terms "multi-DCI (mDCI)," "multi-PDCCH," "multi-TRP system based on multi-DCI," "mDCI-based MTRP," "two CORESET pool indices," or "CORESET pool index = 1 (or a value of 1 or more)" may be interpreted interchangeably.

[0127] The QCLs in this disclosure may be interpreted interchangeably with QCL Type D.

[0128] In this disclosure, phrases such as "TCI state A is the same QCL type D as TCI state B," "TCI state A is the same as TCI state B," and "TCI state A is TCI state B and QCL type D" may be interpreted interchangeably.

[0129] 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 for tracking, CSI-RS having TRS information (upper layer parameter trs-Info), NZP CSI-RS resource in an NZP CSI-RS resource set having TRS information, NZP-CSI-RS resource in an NZP-CSI-RS resource set consisting of multiple NZP-CSI-RS resources for the same antenna port, and TRS resource may be interpreted as one another. In this disclosure, CSI-RS resource, CSI-RS resource set, CSI-RS resource group, and information element (IE) may be interpreted as one another.

[0130] In this disclosure, the code points of the DCI field 'Transmission Configuration Indication', the TCI code points, the DCI code points, and the code points of the TCI field may be interpreted as interchangeable.

[0131] In this disclosure, Single TRP and SFN may be interpreted interchangeably. In this disclosure, HST, HST scheme, High-Speed ​​Mobile Scheme, Scheme 1, Scheme 2, NW pre-compensation scheme, HST scheme 1, HST scheme 2, and HST NW pre-compensation scheme may be interpreted interchangeably.

[0132] In this disclosure, a PDSCH / PDCCH utilizing a single TRP may be interpreted as a PDSCH / PDCCH based on a single TRP, or a single TRP PDSCH / PDCCH. Furthermore, in this disclosure, a PDSCH / PDCCH utilizing an SFN may be interpreted as a PDSCH / PDCCH utilizing an SFN in multiple configurations, an SFN-based PDSCH / PDCCH, or an SFN PDSCH / PDCCH.

[0133] In this disclosure, receiving DL signals (PDSCH / PDCCH) using an SFN may mean receiving the same data (PDSCH) / control information (PDCCH) from multiple transmission / reception points using the same time / frequency resources. Alternatively, receiving DL signals using an SFN may mean receiving the same data / control information from multiple TCI states / spatial domain filters / beams / QCLs using the same time / frequency resources.

[0134] In this disclosure, the terms HST-SFN scheme, SFN scheme Rel.17 and later, new SFN scheme, new HST-SFN scheme, HST-SFN scenario Rel.17 and later, HST-SFN scheme for HST-SFN scenario, SFN scheme for HST-SFN scenario, scheme 1, Doppler pre-compensation scheme, scheme 1 (HST scheme 1), and at least one of the Doppler pre-compensation schemes may be interpreted as interchangeable. In this disclosure, the terms Doppler pre-compensation scheme, base station pre-compensation scheme, TRP pre-compensation scheme, pre-Doppler compensation scheme, Doppler pre-compensation scheme, NW pre-compensation scheme, HST NW pre-compensation scheme, TRP pre-compensation scheme, and TRP-based pre-compensation scheme may be interpreted as interchangeable. In this disclosure, the terms pre-compensation scheme, mitigation scheme, improvement scheme, and correction scheme may be interpreted as interchangeable.

[0135] In this disclosure, the terms PDCCH / searchspace(SS) / CORESET having linkage, linked PDCCH / SS / CORESET, and PDCCH / SS / CORESET pair may be interpreted as mutually exclusive.

[0136] In this disclosure, two linked CORESETs for PDCCH iterations and two CORESETs associated with two linked SS sets may be interpreted as one another.

[0137] In this disclosure, SFN-PDCCH repetition, PDCCH repetition, two linked PDCCHs, and one DCI being received across the two linked search spaces (SS) / CORESETs may be interpreted as mutually exclusive.

[0138] In this disclosure, PDCCH repeats, SFN-PDCCH repeats, PDCCH repeats for higher reliability, PDCCH / CORESET for reliability, and two linked PDCCHs may be interpreted as one another.

[0139] In this disclosure, the terms PDCCH receiving method, PDCCH repetition, SFN-PDCCH repetition, HST-SFN, and HST-SFN scheme may be interpreted interchangeably.

[0140] In this disclosure, the PDSCH receiving method, single DCI-based multi-TRP, and HST-SFN scheme may be interpreted as interchangeable.

[0141] In this disclosure, a single DCI-based multi-TRP repeat may be an NCJT of an enhanced mobile broadband (eMBB) service (low priority, priority 0) or a repeat of an ultra-reliable and low latency communications service (URLLC service, high priority, priority 1).

[0142] In this disclosure, the terms "received DL channel / signal," "DL channel / signal," "DL reception," "received signal," "received channel," etc., may be interpreted interchangeably. In this disclosure, the terms "UL channel / signal," "UL channel / signal transmission," and "UL transmission" may be interpreted interchangeably. In this disclosure, the terms "signal" and "channel" may be interpreted interchangeably.

[0143] In this disclosure, the first TCI state may mean at least one of the first TCI state or a TCI state with a small (or large) TCI state ID. The second TCI state may mean at least one of the second TCI state or a TCI state with a large (or small) TCI state ID. In this disclosure, the first TCI state and the second TCI state may be interchangeable.

[0144] In this disclosure, the terms "lowest," "lower," "highest," and "higher" may be interpreted interchangeably.

[0145] In this disclosure, the terms small, few, short, and low may be interpreted interchangeably. Similarly, in this disclosure, terms such as ignore and drop may be interpreted interchangeably.

[0146] In this disclosure, the terms "repetition," "repeated transmission," and "repeated reception" may be interpreted interchangeably.

[0147] In this disclosure, the phrase "overlapping in the time domain" of multiple channels / signals / resources may be interpreted as "being set to the same symbol" and as "being transmitted / received with the same symbol." The time domain may be interpreted as a specific period of time, a symbol, a slot, or a subslot.

[0148] In this disclosure, the following terms may be interpreted interchangeably: CSI-RS of a CSI-RS resource associated with an NZP CSI-RS resource set setting ("NZP-CSI-RS-ResourceSet") in which the repetition setting (upper layer parameter "repetition") is not set to "on"; CSI-RS of which the repetition setting is not set to "on"; CSI-RS other than CSI-RS of a CSI-RS resource associated with an NZP CSI-RS resource set setting in which the repetition setting is not set to "on"; and CSI-RS other than CSI-RS of which the repetition setting is set to "on".

[0149] The "TCI state" described in each embodiment of this disclosure may be interpreted as a common TCI state, a unified TCI state, a joint TCI state, a separate TCI state, a separate DL TCI state, or a separate UL TCI state. The joint TCI state may mean a TCI state common to both UL and DL. In other words, each embodiment of this disclosure can be appropriately applied to the common TCI state framework as well.

[0150] (Wireless communication method) In the embodiments of this disclosure below, other DL signals, any other DL signals, other DL signals other than CSI-RS, and CORESET / PDCCH may be interpreted as mutually exclusive. In other words, in the embodiments of this disclosure, the overlap between CSI-RS and CORESET / PDCCH will be described primarily, but DL signals that overlap with CSI-RS are not limited to CORESET / PDCCH.

[0151] In each embodiment of this disclosure, CSI-RS is described as the primary example of a specific reference signal, but the specific reference signal is not limited to CSI-RS.

[0152] <First Embodiment> When one or more coresets associated with PDCCH and a CSI-RS overlap in the time domain, the UE may determine that the DMRS for PDCCH of a particular coreset and the CSI-RS have a QCL type D relationship.

[0153] The PDCCH may be a repeated transmission of a PDCCH. The PDCCH may be a repeated transmission of a PDCCH utilizing multiple TRPs.

[0154] In other words, when one or more coresets associated with a PDCCH iteration overlap in the time domain with a CSI-RS, the UE may determine that a TCI state associated with a particular coreset (specifically its DMRS for PDCCH) is a TCI state applicable to the CSI-RS.

[0155] In this disclosure, the particular CORESET may be, for example, a CORESET having a lower (or higher) CORESET ID among the CORESETs relating to the repetition of PDCCH.

[0156] In this disclosure, such particular CORESET may be, for example, a CORESET relating to a TCI state of a lower (or higher) TCI state ID among CORESETs relating to PDCCH repetitions.

[0157] In this disclosure, such particular CORESET may be, for example, a CORESET corresponding to a lower (or higher) CORESET pool index among the CORESETs relating to PDCCH iterations.

[0158] In this disclosure, such particular CORESET may be, for example, a CORESET that corresponds to an earlier (or later / more recent) assigned (transmitted) CORESET (or CORESET start symbol) among the CORESETs relating to the repetition of PDCCH.

[0159] In this disclosure, these specific CORESETs can also be interpreted in other embodiments.

[0160] The CSI-RS in question may also be the CSI-RS of a CSI-RS resource associated with an NZP CSI-RS resource set setting ("NZP-CSI-RS-ResourceSet") in which the repetition setting (upper layer parameter "repetition") is not set to "on".

[0161] A CORESET related to a PDCCH repetition may be multiple CORESETs associated with different QCL type D (TCI state). Multiple CORESETs may be CORESETs associated with linked PDCCHs. The CORESET / PDCCH link may be established based on specific higher-level layer parameters.

[0162] Figure 5A shows an example of the TCI state of CSI-RS according to the first embodiment. In Figure 5A, the symbols transmitted by CSI-RS overlap with the symbols of two CORESETs (CORESET#1 and CORESET#2). CORESET#1 and CORESET#2 correspond to TCI state #1 and TCI state #2, respectively. CORESET#1 and CORESET#2 are associated with two linked PDCCHs. In the example in Figure 5A, CORESET#1 and CORESET#2 do not overlap in the time domain.

[0163] In Figure 5A, the UE determines that the TCI state of CSI-RS is the TCI state associated with CORESET#1, which has a lower CORESET ID / TCI state ID.

[0164] Figure 5B shows another example of the TCI state of the CSI-RS according to the first embodiment. In Figure 5B, the symbols transmitted by the CSI-RS overlap with the symbols of two CORESETs (CORESET#1 and CORESET#2). CORESET#1 and CORESET#2 correspond to TCI state #1 and TCI state #2, respectively. CORESET#1 and CORESET#2 are associated with two linked PDCCHs. In the example in Figure 5B, CORESET#1 and CORESET#2 overlap in the time domain.

[0165] In Figure 5B, the UE determines that the TCI state of CSI-RS is the TCI state associated with CORESET#1, which has a lower CORESET ID / TCI state ID.

[0166] Note that the CORESET in this embodiment does not have to be a CORESET associated with two linked PDCCHs. Also, in Figures 5A and 5B, the lengths of the multiple CORESETs may be the same or different.

[0167] Modified version of the first embodiment The CORESET in this embodiment may be a CORESET related to SFN PDCCH.

[0168] When the CORESET relating to the repetition of SFN PDCCH and the CSI-RS overlap in the time domain, the UE may determine that a specific TCI state / QCL within that CORESET is a TCI state / QCL applicable to the CSI-RS.

[0169] Multiple TCI states may be associated with a CORESET associated with an SFN PDCCH. Such particular TCI state may be, for example, a TCI state with a lower (or higher) TCI state ID among the TCIs of the CORESET associated with the SFN PDCCH.

[0170] The CSI-RS in question may also be the CSI-RS of a CSI-RS resource associated with an NZP CSI-RS resource set setting ("NZP-CSI-RS-ResourceSet") in which the repetition setting (upper layer parameter "repetition") is not set to "on".

[0171] Figure 6 shows an example of the TCI state of CSI-RS according to a modification of the first embodiment. In Figure 6, the symbol transmitted by CSI-RS and the symbol of CORESET#1 overlap. CORESET#1 corresponds to TCI state #1 and TCI state #2.

[0172] In Figure 6, the UE determines that the TCI state of the CSI-RS is TCI state #1, which has a lower TCI state ID.

[0173] According to the first embodiment described above, even if there are multiple CORESETs (TCI states / QCLs) that overlap with CSI-RS in the time domain, the TCI state / QCL of CSI-RS can be appropriately determined.

[0174] <Second Embodiment> In the second embodiment, CSI-RS and any other DL signal (e.g., a specific PDCCH / CORESET) may be set in the time domain in overlapping manner.

[0175] In the second embodiment, the other DL signal may be a DL signal defined in Rel. 17 or later.

[0176] The CSI-RS may be, for example, an A-CSI-RS. The time from the reception of the DCI (triggering DCI) that triggers the CSI-RS to the reception of the CSI-RS may be less than a threshold (for example, "beamSwitchTiming").

[0177] The other DL signal may be, for example, at least one of CORESET / PDCCH, PDSCH, P- / SP- / A-CSI-RS.

[0178] The PDSCH in question may be a PDSCH scheduled at an offset greater than or equal to a threshold (e.g., "timeDurationForQCL").

[0179] The CSI-RS included in the other DL signal may be a P- / SP- / A-CSI-RS in an NZP CSI-RS resource set ("NZP-CSI-RS-ResourceSet") scheduled at an offset greater than or equal to a threshold (e.g., "beamSwitchTiming") when one of several values ​​is reported, and when a parameter for enabling beam switching timing (e.g., "enableBeamSwitchTiming") is not provided, or when an NZP CSI-RS resource set ("NZP-CSI-RS-ResourceSet") having a TRS information parameter (e.g., "trs-Info") is configured.

[0180] The CSI-RS included in the other DL signal may be an A-CSI-RS in an NZP CSI-RS resource set ("NZP-CSI-RS-ResourceSet") where the repetition setting ("repetition") is set to "off". The CSI-RS included in the other DL signal may be an A-CSI-RS in an NZP CSI-RS resource set ("NZP-CSI-RS-ResourceSet") which does not include a repetition setting ("repetition") and a TRS information parameter ("trs-Info"), where the UE provides a threshold (e.g., "beamSwitchTiming-r16") and a parameter to enable beam switching timing (e.g., "enableBeamSwitchTiming"), and is scheduled at an offset of a certain number (e.g., 48) or more.

[0181] The CSI-RS included in the other DL signal may also be an A-CSI-RS in an NZP CSI-RS resource set ("NZP-CSI-RS-ResourceSet") where a parameter to enable beam switching timing (e.g., "enableBeamSwitchTiming") is provided, and the repetition setting ("repetition") is set to "on" and scheduled at an offset greater than or equal to a threshold reported by the UE (e.g., "beamSwitchTiming-r16").

[0182] Embodiment 2-1 A specific PDCCH / CORESET included in another DL signal may be an SFN PDCCH / CORESET. An SFN PDCCH / CORESET may be an SFN PDCCH / CORESET for HST or a PDCCH / CORESET for reliability.

[0183] The PDCCH / CORESET may have multiple (e.g., two) active TCI states.

[0184] When another DL signal and a CSI-RS (e.g., A-CSI-RS) overlap in the time domain, and the other DL signal is a CORESET having multiple (two) TCI states, the UE may determine that a particular TCI state among those multiple TCI states is the QCL assumption for the CSI-RS (e.g., A-CSI-RS).

[0185] The specific TCI state in question may be the first TCI state corresponding to CORESET.

[0186] Other DL signals and CSI-RS (e.g., A-CSI-RS) do not need to overlap in the time domain.

[0187] If a BWP that receives a CSI-RS (e.g., A-CSI-RS) has at least one CORESET configured, the UE may apply the QCL / TCI state of a specific CORESET to the reception of the CSI-RS when it receives the CSI-RS.

[0188] The particular CORESET may be the CORESET that has the lowest (or highest) CORESET ID related to the monitored search space in the latest slot where one or more CORESETs in the active BWP within the serving cell are being monitored.

[0189] In this case, if multiple (two) active TCI states are set for the CORESET, the UE may decide to apply the first TCI state from among the multiple TCI states to the reception of CSI-RS.

[0190] Embodiment 2-2 A specific PDCCH / CORESET included in another DL signal may be at least one of a repeatedly transmitted PDCCH and a CORESET associated with the repetition of the PDCCH. Such PDCCH / CORESET may be a PDCCH / CORESET for reliability.

[0191] The PDCCH / CORESET and at least one of the SS (sets) associated with the PDCCH / CORESET may be linked PDCCH / CORESET / SS (sets).

[0192] [Embodiment 2-2-1] In the case of a CSI-RS symbol (e.g., A-CSI-RS), if no other DL signals are present, the UE may determine / derive the QCL assumption for that CSI-RS based on a specific CORESET.

[0193] The specific CORESET in question may, for example, be the CORESET with the lowest (or highest) CORESET ID related to the monitored search space in the latest slot where one or more CORESETs in the active BWP within the serving cell are being monitored. The UE applies the TCI status / QCL corresponding to the specific CORESET to the received CSI-RS.

[0194] Figure 7 shows an example of determining the default QCL according to Embodiment 2-2-1. In the example in Figure 7, multiple CORESETs (CORESET#1 and #2) are monitored in the latest slot. CORESET#1 corresponds to TCI state #1, and CORESET#2 corresponds to TCI state #2. In Figure 7, the UE determines the default beam (QCL) for A-CSI-RS.

[0195] In Figure 7, the UE applies the TCI state (TCI state #1) corresponding to CORESET #1, which has the lowest CORESET ID in the latest slot, to the A-CSI-RS reception (i.e., determines / derives it as the default QCL for A-CSI-RS).

[0196] [Embodiment 2-2-2] In the symbol for CSI-RS (for example, A-CSI-RS), other DL signals may be present.

[0197] The other DL signal may be a single CORESET.

[0198] The UE may determine / derive the QCL assumption for the CSI-RS based on a specific CORESET.

[0199] The particular CORESET may, for example, be the CORESET having the lowest (or highest) CORESET ID related to the monitored search space in the latest slot where one or more CORESETs in the active BWP within the serving cell are being monitored. In this case, the particular CORESET may mean a CORESET that overlaps with CSI-RS in the time domain. The UE may apply the TCI state / QCL corresponding to the particular CORESET to the reception of CSI-RS.

[0200] Figure 8 shows an example of default QCL determination according to Embodiment 2-2-2. In the example in Figure 8, CORESET#1 overlaps with A-CSI-RS in the time domain. When the UE receives A-CSI-RS, it applies the TCI state (TCI state #1) of CORESET#1 with the lowest CORESET ID in the latest slot (i.e., CORESET#1 which is the CORESET that overlaps with A-CSI-RS) to the reception of A-CSI-RS (i.e., it determines / derives it as the default QCL for A-CSI-RS).

[0201] [Embodiment 2-2-3] In the symbol for CSI-RS (for example, A-CSI-RS), multiple other DL signals may be present.

[0202] The multiple other DL signals may also be multiple CORESETs.

[0203] The UE may determine / derive the QCL assumption for the CSI-RS based on a specific CORESET from among multiple CORESETs.

[0204] The UE may determine / derive the QCL assumption for a CSI-RS based on the specific symbol of the overlapping CSI-RS resource (Embodiment 2-2-3-A).

[0205] For example, the UE may determine / derive the TCI state / QCL to apply to the CSI-RS based on the first / latest symbol of the CSI-RS resource that overlaps with other DL signals. For example, the UE may determine that the TCI state of the CORESET that overlaps with the first / latest symbol of the CSI-RS resource that overlaps with other DL signals is the TCI state / QCL to apply to the CSI-RS.

[0206] The UE may determine / derive the QCL assumption for the CSI-RS based on the CORESET ID of the CORESET that overlaps with the CSI-RS (Embodiment 2-2-3-B).

[0207] For example, the UE may determine that the TCI state corresponding to the CORESET with the lowest (or highest) CORESET ID among multiple CORESETs that overlap with CSI-RS is the TCI state / QCL to apply to CSI-RS.

[0208] The UE may determine / derive the QCL assumption for the CSI-RS based on the TCI state ID of the TCI state corresponding to the CORESET that overlaps with the CSI-RS (Embodiment 2-2-3-C).

[0209] For example, the UE may determine that the TCI state with the lowest (or highest) TCI state ID among the multiple CORESETs corresponding to CSI-RS is the TCI state / QCL to apply to CSI-RS.

[0210] The UE may determine / derive the QCL assumption for the CSI-RS based on other DL signals that overlap with the CSI-RS (Embodiment 2-2-3-D). Different TCI states / QCLs may be applied to a single CSI-RS resource.

[0211] For example, in a CSI-RS resource that overlaps with other DL signals in the time domain, the UE may determine / derive the TCI state / QCL to apply to the reception of CSI-RS in that overlapping CSI-RS resource based on the other overlapping DL signals. In a CSI-RS resource that does not overlap with other DL signals in the time domain, the UE may determine / derive the TCI state / QCL to apply to the reception of CSI-RS in that non-overlapping CSI-RS resource based on specific other DL signals.

[0212] Figure 9 shows an example of determining the default QCL according to Embodiment 2-2-3. In the example shown in Figure 9, CORESET#1 and CORESET#2 overlap in the time domain with A-CSI-RS.

[0213] In Figure 9, the UE may apply the TCI state (TCI state #1) of the CORESET (CORESET #1) that first overlaps with A-CSI-RS in the time domain to the reception of A-CSI-RS (applying Embodiment 2-2-3-A above).

[0214] In Figure 9, the UE may apply the TCI state (TCI state #1) of the CORESET with the lowest CORESET ID (CORESET #1) among the CORESETs that overlap with A-CSI-RS to the reception of A-CSI-RS (applying Embodiment 2-2-3-B above).

[0215] In Figure 9, the UE may apply the TCI state with the lowest TCI state ID (TCI state #1) among the TCI states corresponding to CORESET that overlap with A-CSI-RS to the reception of A-CSI-RS (applying Embodiment 2-2-3-C above).

[0216] In Figure 9, the UE may determine / derive a TCI state to apply to A-CSI-RS reception based on a CORESET that overlaps with A-CSI-RS (applying Embodiment 2-2-3-D above). For example, for an A-CSI-RS resource (symbol) that overlaps with CORESET#1, the UE may apply TCI state #1 corresponding to CORESET#1 to A-CSI-RS reception. Also, for example, for an A-CSI-RS resource (symbol) that overlaps with CORESET#2, the UE may apply TCI state #2 corresponding to CORESET#2 to A-CSI-RS reception. For example, for an A-CSI-RS resource (symbol) that does not overlap with any CORESET, the UE may apply a TCI state corresponding to a specific CORESET (for example, at least one of the CORESET with the lowest (highest) CORESET ID and the CORESET with the lowest (highest) TCI state ID) to A-CSI-RS reception.

[0217] According to the second embodiment described above, even when CSI-RS and a specific DL signal overlap or do not overlap, it is possible to appropriately determine the TCI state / QCL to apply to CSI-RS.

[0218] <Modifications of the first and second embodiments> In each embodiment of this disclosure, the CSI-RS and other DL signals may overlap in the time domain in some or all of the resources.

[0219] Figure 10A shows an example of overlap between A-CSI-RS and other DL signals. In Figure 10A, all of the resources of A-CSI-RS overlap with all of the resources of other DL signals.

[0220] Figure 10B shows another example of overlap between A-CSI-RS and other DL signals. In Figure 10B, A-CSI-RS overlaps with other DL signals in a portion of the A-CSI-RS resources.

[0221] Figure 10C shows another example of overlap between A-CSI-RS and other DL signals. In Figure 10C, A-CSI-RS and other DL signals overlap in some of the resources of the other DL signals.

[0222] In addition, in this disclosure, a configuration in which the start / end symbols of A-CSI-RS and other DL signals coincide is permitted. For example, the UE may assume that the start / end symbols of A-CSI-RS and other DL signals coincide.

[0223] <Third Embodiment> A higher-layer parameter (RRC IE) / UE capability may be defined corresponding to a feature in at least one of the above embodiments. The UE capability may indicate that it supports this feature.

[0224] A UE that has the corresponding higher-layer parameter (the parameter that enables the function) set may perform that function. It may also be stipulated that "a UE for which the corresponding higher-layer parameter is not set shall not perform that function (for example, in accordance with Rel. 15 / 16)."

[0225] A UE that reports its UE capability to support a particular function may perform that function. It may also be stipulated that "a UE that does not report its UE capability to support a particular function shall not perform that function (e.g., in accordance with Rel. 15 / 16)."

[0226] If the UE reports its capability to support the function and the corresponding higher-layer parameters are set, the UE may perform the function. It may also be stipulated that "if the UE does not report its capability to support the function, or if the corresponding higher-layer parameters are not set, the UE shall not perform the function (e.g., according to Rel. 15 / 16)."

[0227] UE capability may indicate whether the UE supports this feature or not.

[0228] The function may also involve applying the default beam (TCI state / spatial relationship / PL-RS / QCL).

[0229] UE capability may be defined by whether or not it supports at least one of the methods for determining the QCL described in the first embodiment above.

[0230] UE capability may be defined by whether it supports default beam (TCI state / spatial relations / PL-RS / QCL) operation.

[0231] UE capability may be defined by whether it supports default beam (TCI state / spatial relation / PL-RS / QCL) operation for CSI-RS.

[0232] UE capability may be defined by whether or not it supports a CORESET with multiple (two) active TCI states.

[0233] According to the third embodiment described above, the UE can achieve the above functions while maintaining compatibility with existing specifications.

[0234] (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.

[0235] Figure 11 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).

[0236] 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.

[0237] 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.

[0238] 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))).

[0239] 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.

[0240] 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).

[0241] 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.

[0242] 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).

[0243] 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.

[0244] 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.

[0245] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0246] 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).

[0247] 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.

[0248] 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.

[0249] 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.

[0250] 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.

[0251] 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.

[0252] 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.

[0253] 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.

[0254] 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.

[0255] 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.

[0256] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted when describing various channels.

[0257] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc., may be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc., may be transmitted.

[0258] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, SS Block (SSB), etc. SS, SSB, etc., may also be called reference signals.

[0259] Furthermore, in the wireless communication system 1, the Uplink Reference Signal (UL-RS) may transmit the Sounding Reference Signal (SRS), Demodulation Reference Signal (DMRS), etc. The DMRS may also be called the User-Specific Reference Signal (UE-specific Reference Signal).

[0260] (base station) Figure 12 shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, transceiver unit 120, transceiver antenna 130, and transmission line interface 140 may be provided.

[0261] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0262] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, control circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0263] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc., using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may also perform call processing of communication channels (setting, releasing, etc.), status management of the base station 10, management of radio resources, etc.

[0264] The transmitting / receiving unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transmitting / receiving unit 120 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0265] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0266] The transmitting and receiving antenna 130 can be composed of an antenna described based on the common understanding in the technical field related to the present disclosure, such as an array antenna.

[0267] The transmitting and receiving unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0268] The transmitting and receiving unit 120 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), etc.

[0269] The transmitting and receiving unit 120 (transmission processing unit 1211) may perform processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (for example, RLC retransmission control), processing of the Medium Access Control (MAC) layer (for example, HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, for example, and generate a bit string to be transmitted.

[0270] 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.

[0271] 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.

[0272] 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.

[0273] 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.

[0274] 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.

[0275] 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.

[0276] 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.

[0277] When one or more control resource sets and channel status information reference signals (CSI-RS) overlap in the time domain, the control unit 110 may determine a quasi-co-location (QCL) assumption to apply to the CSI-RS based on the transmission configuration indication (TCI) state associated with a specific control resource set among the one or more control resource sets. The transmitting / receiving unit 120 may transmit the CSI-RS to which the QCL assumption has been applied (first and second embodiments).

[0278] (User terminal) Figure 13 shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that one or more of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0279] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0280] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., as described based on common understanding in the technical field related to this disclosure.

[0281] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc., using the transmitting / receiving unit 220 and the transmitting / receiving antenna 230. The control unit 210 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transmitting / receiving unit 220.

[0282] The transmission / reception 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 transmission / reception unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0283] The transmission / reception unit 220 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 2211 and an RF unit 222. The reception unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0284] The transmission / reception antenna 230 may be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0285] The transmission / reception unit 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmission / reception unit 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0286] The transmission / reception unit 220 may form at least one of a transmission beam and a reception beam by using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0287] The transmission / reception unit 220 (transmission processing unit 2211) may perform processing of the PDCP layer, processing of the RLC layer (e.g., RLC retransmission control), processing of the MAC layer (e.g., HARQ retransmission control), etc. on, for example, data and control information obtained from the control unit 210, and generate a bit string to be transmitted.

[0288] 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.

[0289] 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.

[0290] 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.

[0291] 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.

[0292] 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.

[0293] 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.

[0294] 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.

[0295] When one or more control resource sets and channel status information reference signals (CSI-RS) overlap in the time domain, the control unit 210 may determine a quasi-co-location (QCL) assumption to apply to the CSI-RS based on the transmission configuration indication (TCI) state associated with a specific control resource set among the one or more control resource sets. The transmitting / receiving unit 220 may receive the CSI-RS to which the QCL assumption has been applied (first and second embodiments).

[0296] If the CSI-RS overlaps with multiple control resource sets in at least part of the time domain, the control unit 210 may determine that the TCI state corresponding to the control resource set with the lowest control resource set ID, or the TCI state with the lowest TCI state ID, among the multiple control resource sets, is the QCL assumption to be applied to the CSI-RS (first and second embodiments).

[0297] If the CSI-RS overlaps with one control resource set in the time domain to at least a portion of it, and multiple TCI states correspond to one control resource set, the control unit 210 may determine that the first TCI state among the multiple TCI states is the QCL assumption to be applied to the CSI-RS (first and second embodiments).

[0298] If the CSI-RS overlaps with a control resource set in the time domain in at least part, the control unit 210 may determine that the TCI state corresponding to the control resource set monitored in the latest slot within the bandwidth portion in which the CSI-RS is set is the QCL assumption to be applied to the CSI-RS (second embodiment).

[0299] (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.

[0300] 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.

[0301] 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 14 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.

[0302] 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 to omit some of the devices.

[0303] 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.

[0304] 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.

[0305] 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.

[0306] 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.

[0307] 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.

[0308] 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.

[0309] The communication device 1004 is hardware (transmitting / receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitting / receiving unit 120 (220), transmitting / receiving antenna 130 (230), etc., may be implemented by the communication device 1004. The transmitting / receiving unit 120 (220) may be implemented with physically or logically separated transmitting unit 120a (220a) and receiving unit 120b (220b).

[0310] 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).

[0311] 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.

[0312] 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.

[0313] (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.

[0314] 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.

[0315] 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.

[0316] 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.

[0317] 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.

[0318] 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.

[0319] 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.

[0320] 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.

[0321] 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.

[0322] 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.

[0323] 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.

[0324] 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.

[0325] 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.

[0326] 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.

[0327] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0328] 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.

[0329] 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.

[0330] 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.

[0331] 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".

[0332] 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.

[0333] 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.

[0334] 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.

[0335] 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.

[0336] 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.

[0337] 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.

[0338] 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).

[0339] 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).

[0340] Furthermore, notification of the specified information (for example, notification that "X is the case") is not limited to explicit notification, but may also be made implicitly (for example, by not notifying the specified information or by notifying other information).

[0341] 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).

[0342] 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.

[0343] 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.

[0344] 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).

[0345] 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.

[0346] 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.

[0347] 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.

[0348] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0349] 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.

[0350] 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.

[0351] 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.

[0352] 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.

[0353] Figure 15 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.

[0354] 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.

[0355] 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).

[0356] 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.

[0357] 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.

[0358] 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.).

[0359] 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.

[0360] 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.

[0361] 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. The communication module 60 may also be, for example, the base station 10 or the user terminal 20 described above (it may function as the base station 10 or the user terminal 20).

[0362] 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.

[0363] 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).

[0364] 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.

[0365] 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.

[0366] 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.

[0367] 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.

[0368] 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.

[0369] 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).

[0370] 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."

[0371] 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.

[0372] 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.

[0373] 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).

[0374] 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.

[0375] Furthermore, "judgment (decision)" can be replaced with "assuming," "expecting," or "considering."

[0376] 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.

[0377] 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.”

[0378] 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).

[0379] 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."

[0380] 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.

[0381] 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.

[0382] 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.

Claims

1. When multiple downlink (DL) signals corresponding to multiple transmission configuration indication (TCI) states and channel status information reference signals (CSI-RS) overlap in the time domain, a control unit determines that a specific TCI state from among the multiple TCI states should be applied to the CSI-RS, A receiving unit that receives the CSI-RS to which the specified TCI state is applied, It has a transmitting unit that reports capability information indicating that it supports the determination of the specific TCI state, The aforementioned multiple DL signals correspond to multiple physical downlink sharing channels (PDSCHs) scheduled at an offset greater than or equal to a threshold reported by the terminal.

2. The terminal according to claim 1, wherein the specific TCI state is the TCI state corresponding to the lowest control resource set pool index, or the TCI state corresponding to the highest control resource set pool index.

3. The terminal according to claim 1, wherein the transmitting unit reports capability information indicating that it supports the decision to apply the specific TCI state to the CSI-RS.

4. When multiple downlink (DL) signals corresponding to multiple transmission configuration indication (TCI) states and channel status information reference signals (CSI-RS) overlap in the time domain, the step of determining which of the multiple TCI states to apply to the CSI-RS is to be performed. The steps include receiving the CSI-RS to which the specific TCI state described above is applied, The step includes reporting capability information indicating that it supports the determination of the specific TCI state, The aforementioned multiple DL signals correspond to multiple physical downlink sharing channels (PDSCHs) scheduled at an offset greater than or equal to a threshold reported by the terminal, in a wireless communication method for the terminal.

5. When multiple downlink (DL) signals corresponding to multiple transmission configuration indication (TCI) states and channel status information reference signals (CSI-RS) overlap in the time domain, a control unit determines to apply a specific TCI state from among the multiple TCI states to the CSI-RS, A transmission unit that transmits the CSI-RS to the terminal with the specified TCI state applied, The system includes a receiving unit that receives capability information from the terminal indicating that it supports the determination of the specific TCI state, The aforementioned multiple DL signals correspond to multiple physical downlink sharing channels (PDSCHs) scheduled at an offset greater than or equal to a threshold reported by the terminal, and the base station.

6. A system having terminals and base stations, The terminal includes a control unit that, when multiple downlink (DL) signals corresponding to multiple transmission configuration indication (TCI) states and channel status information reference signals (CSI-RS) overlap in the time domain, determines to apply a specific TCI state from among the multiple TCI states to the CSI-RS, A receiving unit that receives the CSI-RS to which the specified TCI state is applied, It has a transmitting unit that reports capability information indicating that it supports the determination of the specific TCI state, The base station includes a control unit that determines to apply a specific TCI state to the CSI-RS when the plurality of DL signals and the CSI-RS overlap in the time domain, A transmission unit that transmits the CSI-RS to the terminal with the specified TCI state applied, It has a receiving unit that receives the aforementioned capability information from the terminal, The system comprises multiple DL signals corresponding to multiple physical downlink sharing channels (PDSCHs) scheduled at an offset greater than or equal to a threshold reported by the terminal.

Images