Terminal and wireless communication method

Abstract

A terminal according to one embodiment of the present disclosure includes: a receiving unit that receives one downlink control information (DCI) for scheduling two physical downlink shared channels (PDSCHs); and a control unit that, when a specific code point of a transmission configuration indication (TCI) field is used for receiving the two PDSCHs, maps two TCI state IDs associated with the specific code point to the two PDSCHs respectively. According to one embodiment of the present disclosure, it is possible to appropriately determine QCL parameters for multi-panel / TRP.

Description

Technical Field

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

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

[0003] Research is also being conducted on a successor system to LTE (for example, also referred to as the 5th generation mobile communication system (5G), 5G+ (plus), New Radio (NR), 3GPP Rel. 15 and later, etc.).

[0004] Prior Art Documents

[0005] Non-Patent Documents

[0006] Non-Patent Document 1: 3GPP TS 36.300 V8.12.0 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)", April 2010 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] In a future wireless communication system (for example, NR), research is being conducted on a user terminal (user terminal, User Equipment (UE)) to control transmission / reception processing based on information related to Quasi-Co-Location (QCL).

[0009] In addition, in NR, research is underway on using one or more transmission / reception points (TRPs) (multi-TRP) with one or more panels (multi-panel) to perform DL transmission (e.g., PDSCH transmission) to a UE.

[0010] However, in the NR specifications up to now, since multi-panel / TRP has not been considered, it has not been possible to appropriately determine the QCL parameters in the case where multi-panel / TRP is used. If the QCL parameters cannot be appropriately determined, there are concerns about degradation in system performance such as a reduction in throughput.

[0011] Therefore, one object of the present disclosure is to provide a terminal and a wireless communication method that can appropriately determine QCL parameters for multi-panel / TRP.

[0012] Means for Solving the Problem

[0013] A terminal according to one aspect of the present disclosure includes: a receiving unit that receives one downlink control information (DCI) for scheduling two physical downlink shared channels (PDSCHs); and a control unit that, when a specific code point of a transmission configuration indication (TCI) field is used for receiving the two PDSCHs, maps two TCI state IDs associated with the specific code point to the two PDSCHs, respectively.

[0014] Advantageous Effects of the Invention

[0015] According to one aspect of the present disclosure, it is possible to appropriately determine QCL parameters for multi-panel / TRP. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a diagram showing an example of QCL assumptions for DMRS ports of a PDSCH.

[0017] Figures 2A to 2D is a diagram showing an example of a multi-TRP scenario.

[0018] Figure 3 is a diagram showing an example of PDSCH repetition from multi-TRP.

[0019] Figure 4 is a diagram showing an example of Scheme 1a of PDSCH repetition.

[0020] Figure 5A And Figure 5B is a diagram showing an example of Scheme 2a of PDSCH repetition.

[0021] Figure 6A And Figure 6BThis is a diagram showing an example of Scenario 2b for PDSCH repetition.

[0022] Figure 7A And Figure 7B This is a diagram showing an example of Scenarios 3 and 4 for PDSCH repetition.

[0023] Figure 8A And Figure 8B This is a diagram showing an example of a method for determining QCL parameters of multiple PDSCHs.

[0024] Figure 9A And Figure 9B This is a diagram showing an example of the association between TCI code points and TCI state IDs.

[0025] Figure 10 This is a diagram showing an example of the mapping of two TCI states in Scenario 1a.

[0026] Figure 11A And Figure 11B This is a diagram showing an example of the mapping of two TCI states in Scenario 2a or 2b.

[0027] Figure 12A And Figure 12B This is a diagram showing an example of the mapping of two TCI states in Scenario 3 or 4.

[0028] Figure 13 This is a diagram showing an example of the schematic structure of a wireless communication system according to an embodiment.

[0029] Figure 14 This is a diagram showing an example of the structure of a base station according to an embodiment.

[0030] Figure 15 This is a diagram showing an example of the structure of a user terminal according to an embodiment.

[0031] Figure 16 This is a diagram showing an example of the hardware structure of a base station and a user terminal according to an embodiment. Detailed implementation

[0032] (TCI, QCL)

[0033] In NR, research is being conducted on controlling the 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) of at least one of control signals and channels (referred to as signals / channels) in a UE based on the Transmission Configuration Indication state (TCI state).

[0034] The TCI state can also represent the state of the signal / channel applied to the downlink. A state equivalent to the TCI state of the signal / channel applied to the uplink can also be expressed as a spatial relation.

[0035] The so-called TCI state is information related to the Quasi-Co-Location (QCL) of the signal / channel, and can also be called a spatial reception parameter, Spatial Relation Information, etc. The TCI state can also be set for the UE on a per-channel or per-signal basis.

[0036] The so-called QCL is an index representing the statistical properties of the signal / channel. For example, when a certain signal / channel is in a QCL relationship with other signal / channels, it can also mean that it can be assumed that among these multiple different signal / channels, at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is the same (for at least one of them, it is QCL).

[0037] In addition, the spatial reception parameter can either correspond to the reception beam of the UE (e.g., reception analog beam), or the beam can be determined based on spatial QCL. The QCL (or at least one element of QCL) in this disclosure can also be replaced by sQCL (spatial QCL).

[0038] Multiple types of QCL (QCL types) can also be defined. For example, four QCL types A - D can also be set, and the parameters (or parameter sets) that can be assumed to be the same among these four QCL types A - D are different. The representation of this parameter (which can also be called a QCL parameter) is as follows:

[0039] · QCL type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread;

[0040] · QCL type B (QCL-B): Doppler shift and Doppler spread;

[0041] · QCL type C (QCL-C): Doppler shift and average delay;

[0042] · QCL type D (QCL-D): spatial reception parameter.

[0043] The UE assumes that a certain control resource set (CORESET), channel, or reference signal is in a specific QCL relationship (e.g., QCL type D) with other CORESETs, channels, or reference signals, which can also be referred to as a QCL assumption.

[0044] The UE can also determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of the signal / channel based on the TCI state or QCL assumption of the signal / channel.

[0045] The TCI state can also be, for example, information related to the QCL between the channel that is the object (in other words, the reference signal (RS) used for this channel) and other signals (e.g., other RS). The TCI state can also be set (indicated) by higher layer signaling, physical layer signaling, or a combination thereof.

[0046] In this disclosure, the higher layer signaling can also be, for example, any one of radio resource control (RRC) signaling, medium access control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0047] The MAC signaling can also use, for example, MAC control element (MAC CE), MAC protocol data unit (PDU), etc. The broadcast information can also be, for example, master information block (MIB), system information block (SIB), remaining minimum system information (RMSI), other system information (OSI), etc.

[0048] The physical layer signaling can also be, for example, downlink control information (DCI).

[0049] A channel configured (designated) with a TCI state or a spatial relation may also be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0050] In addition, an RS in a QCL relation with the channel may also be, for example, at least one of a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), a reference signal for measurement (Sounding Reference Signal (SRS)), a CSI-RS for tracking (also referred to as a Tracking Reference Signal (TRS)), and a reference signal for QCL detection (also referred to as a QRS).

[0051] An SSB is a signal block including at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a broadcast channel (Physical Broadcast Channel (PBCH)). The SSB may also be referred to as an SS / PBCH block.

[0052] The UE may also receive, via higher layer signaling, configuration information (e.g., PDSCH-Config, tci-StatesToAddModList) including a list of information elements of TCI states.

[0053] The information element of the TCI state (the "TCI-state IE" of RRC) set by higher-layer signaling may also include the TCI state ID and one or more QCL information ("QCL-Info"). The QCL information may also include at least one of information related to the RS that is in a QCL relationship (RS relationship information) and information indicating the QCL type (QCL type information). The RS relationship information may also include information such as the index of the RS (e.g., SSB index, Non-Zero-Power (NZP) CSI-RS resource ID (identifier)), the index of the cell where the RS is located, and the index of the bandwidth part (BandwidthPart (BWP)) where the RS is located.

[0054] In Rel.15 NR, for the TCI state of at least one of PDCCH and PDSCH, both the RS of QCL type A and the RS of QCL type D are set for the UE, or only the RS of QCL type A is set for the UE.

[0055] In the case where the TRS is set as the RS of QCL type A, it is assumed that the TRS is different from the DeModulation Reference Signal (DMRS) of PDCCH or PDSCH, and the same TRS is transmitted over a long time period and periodically. The UE can measure the TRS and calculate the average delay, delay spread, etc.

[0056] For a UE in which the TRS is set as the RS of QCL type A in the TCI state of the DMRS of PDCCH or PDSCH, it can be assumed that the parameters (average delay, delay spread, etc.) of QCL type A of the DMRS of PDCCH or PDSCH are the same as those of the TRS. Therefore, based on the measurement results of the TRS, the parameters (average delay, delay spread, etc.) of type A of the DMRS of PDCCH or PDSCH can be obtained. When the UE performs channel estimation for at least one of PDCCH and PDSCH, it can use the measurement results of the TRS to perform more accurate channel estimation.

[0057] A UE to which the RS of QCL type D is set can use the RS of QCL type D to determine the UE receive beam (spatial domain receive filter, UE spatial domain receive filter).

[0058] The RS of QCL type X of the TCI state may also refer to the RS that is in a QCL type X relationship with a certain channel / signal (DMRS), and this RS may also be referred to as the QCL source of QCL type X of this TCI state.

[0059] <TCI state for PDCCH>

[0060] The information related to the QCL between the PDCCH (or the DMRS antenna port associated with the PDCCH) and a certain RS can also be referred to as the TCI state for the PDCCH, etc.

[0061] The UE can also determine the TCI state for the UE-specific PDCCH (CORESET) based on higher-layer signaling. For example, for each CORESET, one or more (K) TCI states can be set for the UE through RRC signaling.

[0062] The UE can also activate, for each CORESET, one of the multiple TCI states set by RRC signaling through a MAC CE. This MAC CE can also be referred to as the TCI State Indication for UE-specific PDCCH MAC CE. The UE can also monitor the CORESET based on the activated TCI state corresponding to the CORESET.

[0063] <TCI state for PDSCH>

[0064] The information related to the QCL between the PDSCH (or the DMRS antenna port associated with the PDSCH) and a certain DL-RS can also be referred to as the TCI state for the PDSCH, etc.

[0065] The UE can also be notified (set) of M (M≥1) TCI states for the PDSCH (M QCL information for the PDSCH) through higher-layer signaling. In addition, the number M of the TCI states set for the UE can be restricted by at least one of the UE capability and the QCL type.

[0066] The DCI used in the scheduling of the PDSCH can also include a field indicating the TCI state for the PDSCH (for example, it can also be referred to as the TCI field, TCI state field, etc.). This DCI can also be used for the scheduling of the PDSCH in a cell. For example, it can also be referred to as DLDCI, DL allocation, DCI format 1_0, DCI format 1_1, etc.

[0067] Whether the TCI field is included in the DCI can also be controlled by information notified from the base station to the UE. This information can also be information indicating whether the TCI field is present or absent in the DCI (for example, TCI field presence information, TCI presence information in the DCI, higher layer parameter TCI-PresentInDCI). This information can also be set to the UE, for example, by higher layer signaling.

[0068] When more than 8 types of TCI states are set for the UE, the MAC CE can also be used to activate (or specify) 8 types or less of TCI states. This MAC CE can also be referred to as the TCI States Activation / Deactivation for UE-specific PDSCH MAC CE. The value of the TCI field in the DCI can also represent one of the TCI states activated by the MAC CE.

[0069] When the UE is set with the TCI field presence information that is "valid (enabled)" for the CORESET for scheduling the PDSCH (the CORESET used in the PDCCH transmission for scheduling the PDSCH), the UE can also assume that the TCI field exists in the DCI format 1_1 of the PDCCH transmitted on this CORESET.

[0070] When the TCI field presence information is not set for the CORESET for scheduling the PDSCH, or when the PDSCH is scheduled by the DCI format 1_0, and when the time offset between the reception of the DLDCI (the DCI scheduling the PDSCH) and the reception of the PDSCH corresponding to this DCI is above the threshold, in order to determine the QCL of the PDSCH antenna port, the UE can also assume that the TCI state or QCL assumption for this PDSCH is the same as the TCI state or QCL assumption applied to the CORESET used in the PDCCH transmission for scheduling this PDSCH.

[0071] When the information in the TCI field is set to "valid (enabled)", in the case where the TCI field in the DCI within the component carrier (CC) scheduling the PDSCH indicates the activated TCI state within the scheduled CC or DL BWP, and the PDSCH is scheduled by DCI format 1_1, in order to determine the QCL of the PDSCH antenna port, the UE can also use the TCI that complies with the value of the TCI field in the PDCCH detected with the DCI. When the time offset between the reception of the DL DCI scheduling the PDSCH and the PDSCH corresponding to the DCI (the PDSCH scheduled by the DCI) is above the threshold, the UE can also assume that the DM-RS port of the PDSCH of the serving cell is QCL with the RS within the TCI state associated with the QCL type parameter given by the indicated TCI state.

[0072] When the UE is configured with a single-slot PDSCH, the indicated TCI state can also be based on the activated TCI state within the slot having the scheduled PDSCH. When the UE is configured with a multi-slot PDSCH, the indicated TCI state can also be based on the activated TCI state within the first slot having the scheduled PDSCH, and the UE can also expect it to be the same throughout the slots having the scheduled PDSCH. When the UE is configured with a CORESET associated with a search space set for cross-carrier scheduling, for the UE, the information presence in the TCI field for the CORESET is set to "valid", and when at least one of the TCI states configured for the serving cell scheduled by the search space set includes QCL type D, the UE can also assume that the time offset between the detected PDCCH and the PDSCH corresponding to the PDCCH is above the threshold.

[0073] In the RRC connected mode, in the case where the TCI information (higher layer parameter TCI-PresentInDCI) in the DCI is set to "enabled", and in the case where the TCI information in the DCI is not set, when the time offset between the reception of the DL DCI (DCI scheduling the PDSCH) and the corresponding PDSCH (PDSCH scheduled by this DCI) is less than the threshold, the UE can also assume that the DM-RS port of the PDSCH of the serving cell and the RS related to the QCL parameter used in the QCL indication of the PDCCH of the CORESET are QCL, where the CORESET has the smallest CORESET-ID in the latest (nearest, latest) time slot in which one or more CORESETs within the active BWP of the serving cell are monitored by this UE, and is associated with the monitored search space ( Figure 1 ). This RS can also be referred to as the default TCI state of the PDSCH or the default QCL assumption of the PDSCH.

[0074] The time offset between the reception of the DL DCI and the reception of the PDSCH corresponding to this DCI can also be referred to as the scheduling offset.

[0075] In addition, the above threshold can also be referred to as 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", scheduling offset threshold, scheduling offset threshold, etc.

[0076] The time length for QCL can also be based on the UE capabilities, for example, it can also be based on the decoding of PDCCH and the delay required for beam switching. The time length for QCL can also be the minimum time required for the UE to perform PDCCH reception and apply the spatial QCL information received in the DCI for PDSCH processing. The time length for QCL can be expressed either in terms of the number of symbols per subcarrier spacing or in terms of time (e.g., μs). The information on this time length for QCL can either be reported from the UE to the base station as UE capability information or be set for the UE by the base station using higher layer signaling.

[0077] For example, the UE can also assume that the DMRS port of the above PDSCH and the DL-RS based on the TCI state activated for the CORESET corresponding to the above minimum CORESET-ID are QCL. The latest time slot can also be, for example, the time slot for receiving the DCI that schedules the above PDSCH.

[0078] In addition, the CORESET-ID can also be the ID set through the RRC information element "ControlResourceSet" (the ID for identifying the CORESET, controlResourceSetId).

[0079] In the case where no CORESET is set for the CC, the default TCI state can also be the activated TCI state with the lowest ID that can be applied to the PDSCH within the activated DL BWP of this CC.

[0080] After Rel.16, in the case where the PDSCH and the PDCCH scheduling it are in different component carriers (CCs) (cross-carrier scheduling), if the delay from the PDCCH to the PDSCH (PDCCH-to-PDSCH delay) is less than the time length for QCL, or if the TCI state does not exist in the DCI for this scheduling, the UE can also obtain the QCL assumption for the scheduled PDSCH from the activated TCI state with the lowest ID that can be applied to the PDSCH within the activated BWP of the cell to be scheduled.

[0081] (Service (service type))

[0082] In future wireless communication systems (e.g., NR), it is envisioned to further enhance mobile broadband (e.g., enhanced Mobile Broadband (eMBB)), to enable machine-type communications with a large number of simultaneous connections (e.g., massive Machine Type Communications (mMTC), Internet of Things (IoT)), and service types such as ultra-reliable and low-latency communications (e.g., Ultra-Reliable and Low-Latency Communications (URLLC)) (also referred to as types, services, service types, communication types, usage scenarios, etc.). For example, in URLLC, lower latency and higher reliability than eMBB are required.

[0083] Service types can also be identified in the physical layer based on at least one of the following.

[0084] · Logical channels with different priorities

[0085] · Modulation and Coding Scheme (MCS) table (MCS index table)

[0086] · Channel Quality Indication (CQI) table

[0087] · DCI format

[0088] · Radio Network Temporary Identifier (RNTI) used in the scrambling (masking) of the Cyclic Redundancy Check (CRC) bits included (appended) in the DCI (DCI format), e.g., System Information (SI)-RNTI

[0089] · RRC (Radio Resource Control) parameters

[0090] · Specific RNTIs (e.g., RNTI for URLLC, MCS-C-RNTI, etc.)

[0091] · Search space

[0092] ·Fields within DCI (e.g., newly added fields or reuse of existing fields)

[0093] The service type can also be associated with communication requirements (requirements such as latency, error rate, request conditions), data types (voice, data, etc.).

[0094] The difference between the requirements of URLLC and those of eMBB can be either that the latency of URLLC is less than that of eMBB, or that the requirements of URLLC include the requirement of reliability.

[0095] (Multi-TRP)

[0096] In NR, it is being studied that one or more Transmission / Reception Points (TRPs) (multi-TRP) use one or more panels (multi-panel) to perform DL transmission for the UE. In addition, it is being studied that the UE performs UL transmission for one or more TRPs.

[0097] In addition, multiple TRPs can correspond to the same cell identifier (cell Identifier (ID)), or can correspond to different cell IDs. This cell ID can be either a physical cell ID or a virtual cell ID.

[0098] Figures 2A to 2D It is a diagram showing an example of a multi-TRP scenario. In these examples, it is assumed that each TRP can transmit four different beams, but it is not limited to this.

[0099] Figure 2A It shows an example of a case where only one TRP (TRP1 in this example) in the multi-TRP transmits to the UE (which can also be called single mode, single TRP, etc.). In this case, TRP1 transmits both a control signal (PDCCH) and a data signal (PDSCH) to the UE.

[0100] Figure 2B It is an example showing a case where only one TRP (TRP1 in this example) in the multi-TRP transmits a control signal to the UE, and the multi-TRP transmits data signals (which can also be called single master mode). The UE receives each PDSCH transmitted from the multi-TRP based on one Downlink Control Information (DCI).

[0101] Figure 2CThis represents an example of a scenario where each of multiple TRPs sends a part of a control signal to a UE, and these multiple TRPs send data signals (which can also be referred to as the master-slave mode). It can also be that part 1 of the control signal (DCI) is sent in TRP1, and part 2 of the control signal (DCI) is sent in TRP2. Part 2 of the control signal can also be dependent on part 1. The UE receives each PDSCH sent from these multiple TRPs based on these parts of the DCI.

[0102] Figure 2D This represents an example of a scenario where each of multiple TRPs sends a different control signal to a UE, and these multiple TRPs send data signals (which can also be referred to as the multi-master mode). It can also be that the first control signal (DCI) is sent in TRP1, and the second control signal (DCI) is sent in TRP2. The UE receives each PDSCH sent from these multiple TRPs based on these DCIs.

[0103] In a case such as Figure 2B where one DCI is used to schedule multiple PDSCHs from multiple TRPs (which can also be referred to as multiple PDSCH), this DCI can also be called a single DCI (S-DCI, single PDCCH). In addition, in a case such as Figure 2D where multiple DCIs are used to schedule multiple PDSCHs from multiple TRPs respectively, these multiple DCIs can also be called multi-DCIs (M-DCI, multiple PDCCH).

[0104] It is also possible to send different codewords (Code Word (CW)) and different layers respectively from each TRP of multiple TRPs. As a way of multiple TRP transmission, Non-Coherent Joint Transmission (NCJT) is being studied.

[0105] In NCJT, for example, TRP1 modulates and maps the first codeword, performs layer mapping, and uses the first precoding for the first number of layers (e.g., 2 layers) to send the first PDSCH. In addition, TRP2 modulates and maps the second codeword, performs layer mapping, and uses the second precoding for the second number of layers (e.g., 2 layers) to send the second PDSCH.

[0106] In addition, multiple PDSCHs (multi-PDSCHs) subjected to NCJT may also be defined as partially or fully repeated with respect to at least one of the time domain and the frequency domain. That is to say, the first PDSCH from the first TRP and the second PDSCH from the second TRP may also be repeated with respect to at least one of the time and frequency resources.

[0107] These first PDSCH and second PDSCH may also be considered not to be in a Quasi-Co-Location (QCL) relationship (not quasi-co-located). The reception of the multi-PDSCH may also be replaced by the simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0108] (PDSCH Repetition across Multiple TRPs)

[0109] The case of supporting PDSCH repetitions across multiple TRPs is under study. It is also possible to support at least one of the following repetition methods (schemes) across multiple TRPs in the frequency domain or layer (space) domain or time domain.

[0110] · Repetition multiplexed by space division multiplexing (SDM): Scheme 1a

[0111] · Repetition multiplexed by frequency division multiplexing (FDM): Schemes 2a and 2b

[0112] · Repetition multiplexed by time division multiplexing (TDM): Schemes 3 and 4

[0113] At least one of these schemes may also be supported for URLLC.

[0114] For example, as Figure 3 shown, as PDSCH repetitions, repetition #1 and #2 of codeword (CW) #1 are sent from TRP #1 and TRP #2 respectively.

[0115] [Scheme 1a]

[0116] This scheme may also be used within a single time slot with n (n ≤ N s(Number of spatial resources, number of layers, number of layer sets)) TCI states, and use overlapping time and frequency resource allocations. Each transmission occasion can also be a layer or a set of layers (layer set) of the same transport block (TB). Each layer or layer set can also be associated with a TCI state and a set of DMRS ports. A single codeword accompanied by a redundancy version (RV) can also be used across all spatial layers or layer sets. When observed from the UE, for different coded bits, the same mapping rules as in Rel. 15 are used to map to different layers or different layer sets.

[0117] For example, as Figure 4 shown, Figure 3 Iterations #1 and #2 are respectively mapped to layers #1 and #2 in overlapping time and frequency resources. The UE uses TCI state #1 and RV #0 to receive iteration #1, and uses TCI state #2 and RV #0 to receive iteration #2. For iterations #1 and #2, different TCI states and the same RV are used.

[0118] [Solution 2]

[0119] This solution can also use n (n ≤ N f (Number of frequency resources)) TCI states within a single time slot, and use non - overlapped frequency resource allocations. Each non - overlapped frequency resource allocation can also be associated with a TCI state. The same single or multiple DMRS ports can also be associated with all non - overlapped frequency resource allocations.

[0120] [[Solution 2a]]

[0121] A single codeword accompanied by an RV can also be used across the entire resource allocation. When observed from the UE, the common resource block (RB) mapping (the same mapping from the codeword to the layer as in Rel. 15) can also be applied across the entire resource allocation.

[0122] [[Solution 2b]]

[0123] A single codeword accompanied by an RV can also be applied to each non - overlapped frequency resource allocation. The RVs corresponding to each non - overlapped frequency resource allocation can be either the same or different.

[0124] [[Frequency Resource Allocation]]

[0125] The frequency resource allocation can also be a comb-shaped frequency resource allocation among multiple TRPs. It can also be that, for a broadband precoding resource block group (PRG), the initial ceil(N RB / 2) RBs are allocated to TCI state 1, and the remaining floor(N RB / 2) RBs are allocated to TCI state 2. It can also be that for a PRG size of 2 or 4, the PRGs with even indices within the configured frequency domain resource allocation (frequency domain resource allocation (FDRA)) are allocated to TCI state 1, and the PRGs with odd indices within the configured FDRA are allocated to TCI state 2.

[0126] The precoder granularity P (PRG size) can also be one of the values {2, 4, broadband}. When P is 2 or 4, the PRG divides the BWP into P consecutive PRBs.

[0127] In the case of using scheme 2a, for example, as Figure 5A and Figure 5B shown, Figure 3 the repetitions #1 and #2 of

[0128] are respectively mapped to non-overlapping frequency resource allocations #1 and #2 in overlapping time resources. The UE uses TCI state #1 and RV #0 to receive repetition #1, and uses TCI state #2 and RV #0 to receive repetition #2. Different TCI states and the same RV are used for repetitions #1 and #2. Figure 6A and Figure 6B shown, Figure 3 the repetitions #1 and #2 of

[0129] are respectively mapped to non-overlapping frequency resource allocations #1 and #2 in overlapping time resources. The UE uses TCI state #1 and RV #0 to receive repetition #1, and uses TCI state #2 and RV #3 to receive repetition #2. Different TCI states and different RVs are used for repetitions #1 and #2. Figure 5A and Figure 6A shown, in the case where the precoder granularity is broadband (using a broadband PRG), the non-overlapping frequency resource allocation #1 is the consecutive PRBs in the first half of the BWP, and the non-overlapping frequency resource allocation #2 is the consecutive PRBs in the second half of the BWP. As Figure 5B and Figure 6B shown, in the case where the precoder granularity is 2 or 4 (PRG size is 2 or 4), the non-overlapping frequency resource allocation #1 is the PRGs with even indices, and the non-overlapping frequency resource allocation #2 is the PRGs with odd indices.

[0130] [Solution 3]

[0131] This solution can also use n (n ≤ N t1 (number of time resources)) TCI states within a single time slot and use non-overlapped time resource configuration (allocation). Each transmission occasion of the TB can also use the time granularity of the mini-slot and has one TCI state and one RV. All transmission occasions within the time slot can also use a common MCS with the same single or multiple DMRS ports. Among multiple transmission occasions, at least one of the RV and the TCI state can be the same or different.

[0132] For example, as Figure 7A shown, Figure 3 repetitions #1 and #2 are respectively mapped to transmission occasions #1 and #2 within a time slot. The UE uses TCI state #1 and RV #0 to receive repetition #1 and uses TCI state #2 and RV #3 to receive repetition #2. Different TCI states and different RVs are used for repetitions #1 and #2.

[0133] [Solution 4]

[0134] This solution can also use n (n ≤ N t2 (number of time resources)) TCI states in K (n ≤ K) different time slots. Each transmission occasion of the TB can also have one TCI state and one RV. All transmission occasions spanning K time slots can also use a common MCS with the same single or multiple DMRS ports. Among multiple transmission occasions, at least one of the RV and the TCI state can be the same or different.

[0135] For example, as Figure 7B shown, Figure 3 repetitions #1 and #2 are respectively mapped to transmission occasion #1 within the first time slot and transmission occasion #2 within the second time slot. The UE uses TCI state #1 and RV #0 to receive repetition #1 and uses TCI state #2 and RV #3 to receive repetition #2. Different TCI states and different RVs are used for repetitions #1 and #2.

[0136] According to such a multi-TRP scenario, more flexible transmission control using a good-quality channel can be performed.

[0137] NCJTs using multiple TRPs / panels can use high ranks. To support both ideal and non-ideal backhaul between multiple TRPs, support for both single DCI (single PDCCH, e.g., Figure 2B ) and multiple DCI (multiple PDCCHs, e.g., Figure 2D ) can also be provided. For both single DCI and multiple DCI, the maximum number of TRPs can also be 2.

[0138] Regarding the single PDCCH design (mainly for ideal backhaul), an extension of TCI is being studied. Each TCI code point within the DCI can also correspond to 1 or 2 TCI states. The TCI field size can also be the same as in Rel.15.

[0139] Regarding the single PDCCH design (mainly for ideal backhaul), an extension of DMRS is being studied. The UE can also support the following combinations of layers from two TRPs indicated by the antenna port field. For single codeword (CW) and single user (SU), if the combination of the number of layers of TRP1 and TRP2 is expressed in the form of "number of layers of TRP1 + number of layers of TRP2", it can also be any one of 1+1, 1+2, 2+1, 2+2. Regarding support for the combination of layers of at least one of 1+3 and 3+1 from two TRPs indicated by the antenna port field, support for the multi-user (MU) case, and support for two CWs, no agreement has been reached. The size of the antenna port field can also be the same as in Rel.15.

[0140] Regarding the multiple PDCCH design (for both ideal and non-ideal backhaul), depending on the UE capabilities, the maximum number of CORESETs for each PDCCH configuration information (PDCCH-Config) can also be increased to 5. The maximum number of CORESETs that can be configured for the same TRP can also be up to the number reported by the UE capabilities. The same TRP can also be the same high-layer index (e.g., CORESET pool index) configured per PDCCH configuration information or, if configured, per CORESET. The UE capabilities can also include at least three candidate values.

[0141] Regarding the multiple PDCCH design (for both ideal and non-ideal backhaul), depending on the UE capabilities, the maximum number of resources of at least one of BD and CCE per serving cell and per time slot can also be increased.

[0142] Regarding only the multiple PDCCH-based design, an extension of PDSCH is being studied.

[0143] The total number of CWs within the multiple PDSCHs scheduled may also be at most 2. Each PDSCH is scheduled by a PDCCH. The total number of multi-input multi-output (MIMO) layers of the scheduled PDSCH may also be at most the number reported by the UE's MIMO capabilities. There is no agreement yet on increasing the maximum number of HARQ processes in Rel. 16.

[0144] The UE may also support different PDSCH scrambling sequences for multiple PDSCHs. The UE may also support an extension of the RRC configuration for setting multiple dataScramblingIdentityPDSCHs. Each dataScramblingIdentityPDSCH may also be associated with the higher-layer index (CORESET pool index) of each CORESET and applied to the PDSCH scheduled using the DCI detected on the CORESET with the same higher-layer index.

[0145] For PDSCH resource configuration (allocation), the UE may also support multiple PDSCHs that are at least one of fully overlapped, partially overlapped, or non-overlapped in the time domain and the frequency domain.

[0146] Regarding rate matching, for the LTE cell-specific RS (cell-specific reference signal (CRS)), the CRS mode information (lte-CRS-ToMatchAround) for setting multiple CRS modes within the serving cell is extended. The CRS mode information is a parameter for determining the CRS mode, and the UE may also perform rate matching around the CRS mode.

[0147] The extension of the PUCCH is being studied only for the multi-PDCCH-based design.

[0148] It can also support both joint ACK / NACK (HARQ-ACK) feedback and separate ACK / NACK feedback. RRC signaling can also be used for switching between joint feedback and separate feedback. For joint ACK / NACK feedback, it can also support both semi-static HARQ-ACK codebooks and dynamic HARQ-ACK codebooks. For separate ACK / NACK feedback, the higher layer index of each CORESET used in the generation of the separated HARQ-ACK codebook can be set, and it can also support both semi-static HARQ-ACK codebooks and dynamic HARQ-ACK codebooks. It can also support two long PUCCCHs TDM'd within one time slot, and can also support short PUCCH and long PUCCH TDM'd within one time slot, and can also support two short PUCCCHs TDM'd within one time slot.

[0149] (Default QCL for multi-TRP)

[0150] For single-DCI-based multi-TRP / panel transmission using at least one TCI state, where the at least one TCI state includes QCL type D set for the serving cell of the scheduled PDSCH, after receiving the activation command of the TCI state for the UE-specific PDSCH, if the time offset between the reception of the PDCCH and the corresponding PDSCH is less than the threshold (timeDurationForQCL), the UE can also assume that the DMRS ports of the PDSCH comply with the QCL parameters indicated by the following default TCI state. The UE can also use the TCI state corresponding to the lowest code point among the TCI code points including two different TCI states activated for the PDSCH as the default TCI state. In the case where all TCI code points are mapped to a single TCI state, the default TCI state can also comply with the operation of Rel.15. Using the default TCI state for multiple PDSCHs based on a single DCI can also be part of the UE capability.

[0151] For single-DCI-based multi-TRP / panel transmission, if the time offset between the reception of the PDCCH and the corresponding PDSCH is above the threshold, the UE can also assume that the DMRS ports of the PDSCH comply with one or two TCI states corresponding to the TCI code point indicated by the TCI field within the PDCCH.

[0152] For multi-TRP / panel transmission based on multiple DCIs, when the CORESET Pool Index (CORESETPoolIndex) is set, if the time offset between the reception of the PDCCH and the corresponding PDSCH is less than a threshold, the UE can also assume that the DM-RS ports of the PDSCH and the RS related to the QCL parameters used in the PDCCH with the lowest CORESET index among the CORESETs with the same value of the CORESET Pool Index set in each latest time slot monitored by the UE for one or more CORESETs associated with each CORESET Pool Index within the active BWP of the serving cell are QCL. Support for this function can also be indicated (reported) by the UE capability. In the case where the UE does not support this function, the Rel.15 operation can be reused regardless of the CORESET Pool Index.

[0153] Figure 8A And Figure 8B is a diagram showing an example of the default QCL for multiple PDSCHs based on a single DCI. This example corresponds to the example of a single PDCCH shown in Figure 2B .

[0154] The UE receives DCI1 and PDSCH1 transmitted from panel 1 (or TRP1 or CORESET pool 1). In addition, the UE receives PDSCH2 transmitted from panel 2 (or TRP2 or CORESET pool 2).

[0155] DCI1 schedules the reception of PDSCH1 and PDSCH2. The scheduling offset 1 from the reception of this DCI1 to PDSCH1 is less than the scheduling offset threshold. In addition, the scheduling offset 2 from the reception of this DCI1 to PDSCH2 is less than the scheduling offset threshold.

[0156] Figure 8B is an example showing the correspondence between the TCI code points and TCI states of the TCI field of DCI1 envisioned in the example of Figure 8A . In this example, the lowest code point among the TCI code points including two different TCI states activated for the PDSCH is "001". The UE can also use the TCI states (TCI state IDs) of T0 and T1 corresponding to this TCI code point "001" as the default QCL for PDSCH1 and PDSCH2.

[0157] However, it is not yet clear how to map the two different TCI states determined for multiple PDSCHs across multiple TRPs to each PDSCH (CW). If the TCI state of each PDSCH is not clear, the UE cannot properly demodulate each PDSCH, and there is a concern that the increase in communication throughput will be suppressed.

[0158] Therefore, the inventors of the present invention have come up with a method for appropriately determining the TCI state of multi-PDSCHs spanning multiple TRPs.

[0159] Hereinafter, embodiments related to the present disclosure will be described in detail with reference to the drawings. The wireless communication methods related to the respective embodiments can be applied separately or in combination.

[0160] In the present disclosure, a panel, an uplink (UL) transmission entity, a TRP, a spatial relationship, a control resource set (CORESET), a PDSCH, a codeword, a base station, an antenna port of a certain signal (e.g., a demodulation reference signal (DMRS) port), a group of antenna ports of a certain signal (e.g., a DMRS port group), a group for multiplexing (e.g., a code division multiplexing (CDM) group, a reference signal group, a CORESET group), a CORESET pool, a CW, a redundancy version (RV), a layer (MIMO layer, transmission layer, spatial layer) can also be mutually replaced. In addition, a panel identifier (identifier (ID)) and a panel can also be mutually replaced. In the present disclosure, a TRP ID and a TRP can also be mutually replaced.

[0161] In the present disclosure, NCJT, NCJT using multiple TRPs, multi-PDSCHs using NCJT, multi-PDSCHs, multiple PDSCHs from multiple TRPs, etc. can also be mutually replaced. In addition, multi-PDSCHs can refer to multiple PDSCHs multiplexed by at least one of SDM, FDM, and TDM, multiple PDSCHs carrying the same TB or the same CW, or multiple PDSCHs to which different UE reception beams (spatial domain reception filters, QCL parameters, TCI states) are applied.

[0162] In the present disclosure, a default TCI state can also be mutually replaced with a default QCL, a default QCL assumption, etc. Hereinafter, the TCI state or QCL (QCL assumption) will be referred to as a default TCI state, but the name is not limited thereto.

[0163] In addition, the definition of the default TCI state is not limited to this. The default TCI state can be, for example, a TCI state envisioned in the case where a certain channel / signal (e.g., PDSCH) cannot utilize the TCI state / QCL specified by DCI, or a TCI state envisioned in the case where no TCI state / QCL is specified (or set).

[0164] In the present disclosure, cell, CC, carrier, BWP, and band can also be replaced with each other.

[0165] In the present disclosure, index, ID, indicator, and resource ID can also be replaced with each other.

[0166] TCI state, TCI state or QCL assumption, QCL assumption, QCL parameter, spatial domain reception filter, UE spatial domain reception filter, spatial domain filter, UE reception beam, DL reception beam, DL precoding, DL precoder, DL-RS, QCL parameter followed by DMRS port, RS of QCL type D of TCI state or QCL assumption, and RS of QCL type A of TCI state or QCL assumption can also be replaced with each other. RS of QCL type D, DL-RS associated with QCL type D, DL-RS having QCL type D, source of DL-RS, SSB, and CSI-RS can also be replaced with each other.

[0167] In the present disclosure, the TCI state can also be information (e.g., DL-RS, QCL type, cell that transmits DL-RS, etc.) related to the reception beam (spatial domain reception filter) indicated (set) for the UE. The QCL assumption can also be information (e.g., DL-RS, QCL type, cell that transmits DL-RS, etc.) related to the reception beam (spatial domain reception filter) envisioned by the UE based on the transmission or reception of an associated signal (e.g., PRACH).

[0168] In the present disclosure, the latest time slot, the most recent time slot, the latest search space, and the most recent search space can also be replaced with each other.

[0169] In the present disclosure, DCI format 0_0, DCI without SRI, DCI without indication of spatial relationship, and DCI without CIF can also be replaced with each other. In the present disclosure, DCI format 0_1, DCI with SRI, DCI with indication of spatial relationship, and DCI with CIF can also be replaced with each other.

[0170] (Wireless communication method)

[0171] The UE may also receive a single DCI for scheduling multiple PDSCHs.

[0172] <Method for determining multiple TCI states>

[0173] In this method for determining multiple TCI states, the mapping between two PDSCHs and two TCI states is described. However, for N greater than or equal to 2, the mapping between N PDSCHs and N TCI states can be applied in the same way.

[0174] When the UE uses two TCI states corresponding to a specific TCI code point for two PDSCHs, the UE may also map the two TCI states corresponding to the specific TCI code point to the two PDSCHs. The specific TCI code point and the two TCI states can be associated by at least one of an RRC-based configuration and an MAC CE-based activation. The specific TCI code point can be either the lowest code point among the TCI code points including two different active TCI states for PDSCH when the time offset between the DCI and the corresponding multiple PDSCHs is less than a threshold, or when the information in the TCI field is not set, or the TCI code point indicated by the TCI field in a single DCI for scheduling multiple PDSCHs when the time offset between the DCI and the corresponding multiple PDSCHs is greater than or equal to the threshold.

[0175] The UE may also determine the order (ID related to the PDSCH) of two PDSCHs. The UE may also determine the order of two PDSCHs based on either the respective resources of the two PDSCHs or the parameters used in each of the two PDSCHs. The order of the two PDSCHs may also be associated with the resources or parameters for at least one of the following: PDSCH, CW, HARQ process ID, layer, TB, RV, the CORESET (CORESET pool index) scheduling the PDSCH, the order of the reception occasion (reception timing, reception start symbol, reception time slot) of the PDSCH in Scheme 3 or 4, the order of the frequency (frequency resource, RE, PRB, PRG) of the PDSCH in Scheme 2a or 2b, first transmission, and retransmission.

[0176] The UE may also map the two TCI states corresponding to a specific TCI code point to the two PDSCHs based on the order of the two PDSCHs and any one of the following mappings 1 and 2.

[0177] [Mapping 1]

[0178] The UE may also determine the first TCI state ID and the second TCI state ID in the order of the TCI state IDs (ascending or descending).

[0179] [Mapping 2]

[0180] The UE can also determine the first TCI state ID and the second TCI state ID according to the order (position, ascending or descending) of the TCI state IDs notified by at least one of setting or activation.

[0181] For Mapping 2, for example, when two TCI state IDs associated with a specific TCI code point are set through a list of RRC information elements (IEs), the first TCI state ID and the second TCI state ID are determined according to their positions in the list. For example, when two TCI state IDs associated with a specific TCI code point are activated through a field of MAC CE, the first TCI state ID and the second TCI state ID are determined according to their positions in the MAC CE. For example, when two TCI state IDs associated with a specific TCI code point are set or activated through a bitmap of RRC or MAC CE and the bit positions in the bitmap correspond to the TCI state IDs, the first TCI state ID and the second TCI state ID are determined according to the positions of the bits corresponding to the two TCI states.

[0182] For example, Figure 9A is a diagram showing an example of the association between a TCI code point and TCI states notified by at least one of RRC-based setting and MAC CE-based activation. In this example, the specific TCI code point is the lowest code point among the TCI code points including two active TCI states, which is "001". As the TCI state IDs associated with the specific TCI code point, 0 and 1 are notified. When Mapping 2 (ascending order of the positions of TCI state IDs in the notification) is used for this association, the first TCI state ID is 0 and the second TCI state ID is 1.

[0183] When using Scenario 1a, the first TCI state ID can also be used for layer #1 and the second TCI state ID can be used for layer #2. When Mapping 2 is used for the Figure 9A association, for example, as shown in Figure 10 the TCI state ID of layer #1 is 0 and the TCI state ID of layer #2 is 1.

[0184] When using Scenario 2a or 2b, the first TCI state ID can also be used for frequency resource configuration #1 and the second TCI state ID can be used for frequency resource configuration #2. When Mapping 2 is used for the Figure 9A association, for example, as shown in Figure 11Aand Figure 11B As shown, the TCI state ID of frequency resource configuration #1 is 0, and the TCI state ID of frequency resource configuration #2 is 1.

[0185] In the case of using Scenario 3 or 4, the first TCI state ID can also be used for transmission occasion #1, and the second TCI state ID can be used for transmission occasion #2. When mapping 2 is used for the Figure 9A associated mapping, for example, as Figure 12A and Figure 12B shown, the TCI state ID of transmission occasion #1 is 0, and the TCI state ID of transmission occasion #2 is 1.

[0186] For example, Figure 9B is a diagram showing another example of the association between TCI code points and TCI states notified by at least one of RRC-based settings and MAC CE-based activation. In this example, the specific TCI code point is the lowest code point among the TCI code points including two active TCI states, which is "001". 1 and 0 are notified as the TCI state IDs associated with the specific TCI code point. When mapping 1 (ascending order of TCI state IDs) is used for this association, the first TCI state ID is 0, and the first TCI state ID is 1.

[0187] When mapping 1 (ascending order of TCI state IDs) is used for the Figure 13 associated mapping, the two TCI states for two PDSCHs are the same as those in Figure 10 , Figure 11A , Figure 11B , Figure 12A , Figure 12B .

[0188] According to the method for determining multiple TCI states described above, even when one TCI code point is associated with N active TCI states, the UE can appropriately map the N TCI states to N PDSCHs.

[0189]

[0190] When the single QCL application condition is met, the UE can also assume (use, determine) one default QCL for all PDSCHs (repeatedly).

[0191] The single QCL application condition can also be that the TCI field presence information (tci-PresentInDCI) is not set.

[0192] The single QCL application condition may also be that the information in the TCI field is set, and no TCI code point is associated with two active TCI states.

[0193] A default QCL in the case of meeting the single QCL application condition may also be any of the following TCI states or QCL assumptions:

[0194] · The TCI state with the lowest ID or the highest ID having a CORESET, or the TCI state with the lowest ID or the highest ID of the CORESET on the latest time slot

[0195] · An active TCI state associated with the lowest code point among the TCI code points associated with an active TCI state

[0196] · The TCI state with the lowest ID among the active TCI states

[0197] · The TCI state of the CORESET of the DCI that schedules multiple PDSCHs

[0198] · A default QCL explicitly notified by MAC CE or RRC (new parameters, new fields)

[0199] · The first default QCL among the two default QCLs explicitly notified by MAC CE or RRC (new parameters, new fields)

[0200] · The TCI state with the lowest ID or the highest ID among the two default QCLs explicitly notified by MAC CE or RRC (new parameters, new fields)

[0201] According to the method for determining a TCI state described above, when the information in the TCI field is not set, or when there is no TCI code point associated with two active TCI states, the UE can appropriately determine a default QCL for multiple PDSCHs.

[0202] (Wireless communication system)

[0203] Hereinafter, the structure of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, any one or a combination of the wireless communication methods according to the above-described various embodiments of the present disclosure is used for communication.

[0204] Figure 13It is a diagram showing an example of the schematic structure of a wireless communication system according to an embodiment. The wireless communication system 1 may also be a system that realizes communication by using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the 5th generation mobile communication system New Radio (5G NR), or the like.

[0205] In addition, the wireless communication system 1 may also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple Radio Access Technologies (RATs). MR-DC may also 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 the like.

[0206] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the Secondary Node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0207] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both the MN and the SN are base stations (gNBs) of NR (NR-NR Dual Connectivity (NN-DC))).

[0208] The wireless communication system 1 may also include: a base station 11 that forms a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a - 12c) that is disposed within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located within at least one cell. The configuration, number, etc. of each cell and the user terminal 20 are not limited to the manner shown in the figure. Hereinafter, without distinguishing between the base stations 11 and 12, they are collectively referred to as the base station 10.

[0209] The user terminal 20 may also be connected to at least one of the multiple base stations 10. The user terminal 20 may also utilize at least one of carrier aggregation (CA) and dual connectivity (DC) that uses multiple component carriers (CCs).

[0210] Each CC may also be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub - 6 GHz), and FR2 may be a frequency band higher than 24 GHz (above - 24 GHz). Additionally, the frequency bands, definitions, etc. of FR1 and FR2 are not limited to this. For example, FR1 may also correspond to a frequency band higher than FR2.

[0211] Furthermore, in each CC, the user terminal 20 may communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0212] The multiple base stations 10 may be connected by wire (e.g., optical fiber based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11, which is equivalent to the upper - level station, may be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12, which is equivalent to a relay station, may be referred to as an IAB node.

[0213] Base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), etc.

[0214] User terminal 20 may also be a terminal supporting at least one of communication modes such as LTE, LTE-A, 5G, etc.

[0215] In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) may also be utilized. For example, in at least one of the Downlink (DL) and the Uplink (UL), 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 also be utilized.

[0216] The wireless access method may also be referred to as a waveform. Additionally, in the wireless communication system 1, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) may also be applied in the wireless access methods of the UL and the DL.

[0217] As a downlink channel, in the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. shared among the user terminals 20 may also be used.

[0218] In addition, as an uplink channel, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. that are shared among the user terminals 20 can also be used.

[0219] User data, high-layer control information, System Information Block (SIB), etc. are transmitted through the PDSCH. User data, high-layer control information, etc. can also be transmitted through the PUSCH. In addition, the Master Information Block (MIB) can be transmitted through the PBCH.

[0220] Low-layer control information can also be transmitted through the PDCCH. The low-layer control information can also include, for example, downlink control information (Downlink Control Information (DCI)), and this downlink control information includes scheduling information for at least one of the PDSCH and the PUSCH.

[0221] In addition, the DCI that schedules the PDSCH can also be referred to as DL allocation, DL DCI, etc., and the DCI that schedules the PUSCH can also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH can also be replaced by DL data, and the PUSCH can also be replaced by UL data.

[0222] In the detection of the PDCCH, a control resource set (COntrol REsource SET (CORESET)) and a search space can also be utilized. The CORESET corresponds to the resource for searching for DCI. The search space corresponds to the search area and search method for PDCCH candidates (PDCCH candidates). One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a certain search space based on the search space setting.

[0223] A search space may also correspond to PDCCH candidates that match one or more aggregation levels. One or more search spaces may also be referred to as a set of search spaces. Additionally, terms such as "search space", "set of search spaces", "search space configuration", "set of search space configurations", "CORESET", "CORESET configuration", etc. in this disclosure may be used interchangeably with each other.

[0224] Uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (e.g., also referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) may also be transmitted via PUCCH. A random access preamble for establishing a connection with a cell may also be transmitted via PRACH.

[0225] In addition, in this disclosure, the downlink, uplink, etc. may also be expressed without "link". Further, it may also be expressed without "Physical" at the beginning of various channels.

[0226] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may also be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may also be transmitted.

[0227] The synchronization signal may also 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 also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), etc. Additionally, SS, SSB, etc. may also be referred to as reference signals.

[0228] Furthermore, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a sounding reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. may also be transmitted in the wireless communication system 1. Additionally, DMRS may also be referred to as a UE-specific reference signal.

[0229] (Base station)

[0230] Figure 14 FIG. is an example showing the structure of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission path interface (transmission line interface) 140. Additionally, one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140 may be provided respectively.

[0231] Furthermore, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it can also be assumed that the base station 10 also has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0232] The control unit 110 implements overall control of the base station 10. The control unit 110 can be composed of a controller, a control circuit, etc. that can be explained based on common knowledge in the technical field related to the present disclosure.

[0233] The control unit 110 can also control the generation, scheduling (e.g., resource allocation, mapping), etc. of signals. The control unit 110 can also control the transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 can also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 120. The control unit 110 can also perform call processing (setting, release, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0234] The transmission and reception unit 120 may also include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transmission and reception unit 120 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission and reception circuit, etc. described based on common knowledge in the technical field related to the present disclosure.

[0235] The transmission and reception unit 120 can be configured as an integrated transmission and reception unit, or can be composed of a transmission unit and a reception unit. The transmission unit can also be composed of the transmission processing unit 1211 and the RF unit 122. The reception unit can also be composed of the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

[0236] The transmission and reception antenna 130 can be composed of an antenna described based on common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0237] The transmission and reception unit 120 can also transmit the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission and reception unit 120 can also receive the above-mentioned uplink channels, uplink reference signals, etc.

[0238] The transmission and reception unit 120 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmission beam and a reception beam.

[0239] The transmission / reception unit 120 (transmission processing unit 1211) may also perform, for example, processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (e.g., RLC retransmission control), processing of the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0240] The transmission / reception unit 120 (transmission processing unit 1211) may also perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0241] The transmission / reception unit 120 (RF unit 122) may also perform modulation to a radio frequency band, filter processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0242] On the other hand, the transmission / reception unit 120 (RF unit 122) may also perform amplification, filter processing, demodulation to a baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 130.

[0243] The transmission / reception unit 120 (reception processing unit 1212) may also perform reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filter processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal, and obtain user data, etc.

[0244] The transmission / reception unit 120 (measurement unit 123) may also perform measurements related to the received signal. For example, the measurement unit 123 may also perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may also perform measurements on 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 also be output to the control unit 110.

[0245] The transmission path interface 140 may also transmit and receive signals (backhaul signaling) between the device included in the core network 30, other base stations 10, etc., and may also obtain and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0246] In addition, the transmission unit and reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0247] In addition, the transmission / reception unit 120 may also transmit one or both of multiple downlink shared channels (Physical Downlink Shared Channel (PDSCH)) (multi-PDSCH) scheduled based on one downlink control information (single PDCCH).

[0248] (User Terminal)

[0249] Figure 15 FIG. is an example showing the structure of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided respectively.

[0250] In addition, in this example, the functional blocks of the characteristic part in this embodiment are mainly shown, and it can also be assumed that the user terminal 20 also has other functional blocks required for wireless communication. A part of the processing of each unit described below can also be omitted.

[0251] The control unit 210 implements the overall control of the user terminal 20. The control unit 210 can be composed of a controller, a control circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0252] The control unit 210 can also control the generation, mapping, etc. of signals. The control unit 210 can also control the transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission / reception unit 220.

[0253] 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 can 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. described based on the common knowledge in the technical field related to the present disclosure.

[0254] The transmission / reception unit 220 can be configured as an integrated transmission / reception unit, or can be composed of a transmission unit and a reception unit. The transmission unit can be composed of the transmission processing unit 2211 and the RF unit 222. The reception unit can be composed of the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0255] The transmission / reception antenna 230 can 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.

[0256] The transmission / reception unit 220 can also receive the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission / reception unit 220 can also transmit the above-mentioned uplink channels, uplink reference signals, etc.

[0257] The transmission / reception unit 220 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of the transmission beam and the reception beam.

[0258] The transmission / reception unit 220 (transmission processing unit 2211) may also perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0259] The transmission / reception unit 220 (transmission processing unit 2211) may also perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0260] In addition, regarding whether to apply DFT processing, it may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when the transform precoding is active (enabled), the transmission / reception unit 220 (transmission processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using the DFT-s-OFDM waveform. Otherwise, the transmission / reception unit 220 (transmission processing unit 2211) may not perform DFT processing as the above-mentioned transmission processing.

[0261] The transmission / reception unit 220 (RF unit 222) may also perform modulation to the radio frequency band, filter processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 230.

[0262] On the other hand, the transmission / reception unit 220 (RF unit 222) may also perform amplification, filter processing, demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 230.

[0263] The transmission / reception unit 220 (reception processing unit 2212) may also perform reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal, and obtain user data, etc.

[0264] The transmitting and receiving unit 220 (measurement unit 223) may also perform measurements related to the received signal. For example, the measurement unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may also measure the 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 also be output to the control unit 210.

[0265] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230.

[0266] The transmitting and receiving unit 220 may also receive one downlink control information, i.e., DCI, for scheduling two physical downlink shared channels, i.e., PDSCH. In the case where a specific code point of the transmission configuration indication field, i.e., TCI field, is used for the reception of the two PDSCHs, the control unit 210 may also map two TCI state IDs associated with the specific code point to the two PDSCHs, respectively.

[0267] The specific code point may be either the lowest code point among the code points of the TCI field associated with two different active TCI states for PDSCH in the case where the time offset between the DCI and the two PDSCHs is less than a threshold or in the case where no TCI field is set, or the code point indicated by the TCI field in the DCI in the case where the time offset between the DCI and the two PDSCHs is greater than or equal to the threshold.

[0268] The control unit 210 may also map the two TCI state IDs to the two PDSCHs, respectively, based on the positions or the order of the two TCI state IDs in the notification of the two TCI state IDs and the order of the two PDSCHs.

[0269] The control unit 210 may also determine the order of the two PDSCHs based on at least one of the resources of each of the two PDSCHs and the parameters used in each of the two PDSCHs.

[0270] In the case where the presence of the TCI field is not set, or in the case where the presence of the TCI field is set and no code point of the TCI field is associated with two TCI state IDs, the control unit 210 may also use one TCI state for the reception of the two PDSCHs.

[0271] (Hardware Structure)

[0272] In addition, the block diagrams used in the description of the above embodiments illustrate blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. Furthermore, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented by a single device physically or logically combined, or can be implemented by two or more physically or logically separated devices directly or indirectly (e.g., by wire, wireless, etc.) connected with these multiple devices. A functional block can also be implemented by combining the above single device or the above multiple devices with software.

[0273] Here, in terms of functions, there are judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, establishment, comparison, assumption, expectation, regarded as, broadcasting, notifying, communicating, forwarding, configuring (setting), reconfiguring (resetting), allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a transmission function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0274] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure can also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 16 FIG. is an example showing the hardware structure of a base station and a user terminal according to an embodiment. The above base station 10 and user terminal 20 can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0275] In addition, in the present disclosure, terms such as device, circuit, equipment, section, unit, etc. can be replaced with each other. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of each device shown in the figure, or can be configured not to include some devices.

[0276] For example, only one processor 1001 is illustrated, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or by other means. Further, the processor 1001 may also be implemented by one or more chips.

[0277] Regarding each function in the base station 10 and the user terminal 20, for example, by reading a specific software (program) into hardware such as the processor 1001 and the memory 1002, the processor 1001 performs operations and controls communication via the communication device 1004, or controls at least one of reading and writing data in the memory 1002 and the storage device 1003, thereby implementing the functions.

[0278] The processor 1001 operates the operating system, for example, to control the entire computer. The processor 1001 may also be constituted by a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, registers, etc. For example, at least a part of the above control unit 110 (210), transmission / reception unit 120 (220), etc. may also be implemented by the processor 1001.

[0279] In addition, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage device 1003 and the communication device 1004 into the memory 1002, and performs various processes based on them. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments may be used. For example, the control unit 110 (210) may also be implemented by a control program stored in the memory 1002 and operating in the processor 1001, and the same applies to other functional blocks.

[0280] The memory 1002 may also be a computer-readable recording medium, and may be constituted by at least one of, for example, a read-only memory (Read Only Memory (ROM)), an erasable programmable read-only memory (Erasable Programmable ROM (EPROM)), an electrically erasable programmable read-only memory (Electrically EPROM (EEPROM)), a random access memory (Random Access Memory (RAM)), and other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store a program (program code), software module, etc. executable for implementing the wireless communication method according to an embodiment of the present disclosure.

[0281] The storage device 1003 can also be a computer-readable recording medium, which is constituted by, for example, at least one of a flexible disc, a floppy (registered trademark) disc, an optical disc (such as a compact disc (Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray (registered trademark) disc), a removable disc, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage device 1003 can also be referred to as an auxiliary storage device.

[0282] The communication device 1004 is hardware (a transmitting and receiving device) for performing communication between computers via at least one of a wired network and a wireless network. For example, it is also referred to as a network device, a network controller, a network card, a communication module, etc. In order to implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD), the communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. can also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) can also be physically or logically separated and installed by a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0283] The input device 1005 is an input device (such as a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) for receiving an input from the outside. The output device 1006 is an output device (such as a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) for performing an output to the outside. In addition, the input device 1005 and the output device 1006 can also be of an integrated structure (such as a touch panel).

[0284] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 can be constituted by a single bus or by different buses between each device.

[0285] In addition, the base station 10 and the user terminal 20 may also 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). Part or all of each functional block may also be implemented using such hardware. For example, the processor 1001 may also be installed using at least one of such hardware.

[0286] (Variant example)

[0287] In addition, the terms described in this disclosure and the terms required for understanding this disclosure may also be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may also be replaced with each other. In addition, a signal may also be a message. A reference signal can also be abbreviated as RS and may also be referred to as a pilot, a pilot signal, etc. according to the applied standard. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0288] A radio frame may also be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) independent of the numerology.

[0289] Here, the numerology may also refer to communication parameters applied in at least one of transmission and reception of a certain signal or channel. For example, the numerology may also represent at least one of a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, specific filtering processing performed by a transmitter-receiver in the frequency domain, specific windowing processing performed by a transmitter-receiver in the time domain, etc.

[0290] A time slot can also be composed of one or more symbols (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot can also be a time unit based on a parameter set.

[0291] A time slot can also contain multiple mini-slots. Each mini-slot can also be composed of one or more symbols in the time domain. In addition, a mini-slot can also be referred to as a sub-slot. A mini-slot can also be composed of a smaller number of symbols than a time slot. The PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot can also be referred to as PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using a mini-slot can also be referred to as PDSCH (PUSCH) mapping type B.

[0292] A radio frame, a sub-frame, a time slot, a mini-slot, and a symbol all represent time units when transmitting a signal. A radio frame, a sub-frame, a time slot, a mini-slot, and a symbol can also use their respective other names. In addition, the time units such as frames, sub-frames, time slots, mini-slots, symbols, etc. in this disclosure can also be replaced with each other.

[0293] For example, a sub-frame can also be referred to as a TTI, multiple consecutive sub-frames can also be referred to as a TTI, and a time slot or a mini-slot can also be referred to as a TTI. That is to say, at least one of a sub-frame and a TTI can be a sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (for example, 1 - 13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI can also not be referred to as a sub-frame, but as a time slot, a mini-slot, etc.

[0294] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used in each user terminal) to each user terminal in units of TTI. In addition, the definition of the TTI is not limited to this.

[0295] The TTI can also be the transmission time unit of a data packet (transmission block), a code block, a codeword, etc. that has undergone channel coding, and can also become the processing unit for scheduling, link adaptation, etc. In addition, when the TTI is given, the actual time interval (such as the number of symbols) for mapping a transmission block, a code block, a codeword, etc. can also be shorter than the TTI.

[0296] In addition, in the case where one time slot or one mini time slot is referred to as a TTI, more than one TTI (i.e., more than one time slot or more than one mini time slot) can also be the minimum time unit for scheduling. In addition, the number of time slots (number of mini time slots) that constitute the minimum time unit of this scheduling can also be controlled.

[0297] A TTI having a time length of 1 ms can also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than the normal TTI can also be referred to as a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0298] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) can also be replaced with a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) can also be replaced with a TTI having a TTI length less than that of the long TTI and 1 ms or more.

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

[0300] In addition, an RB can also include one or more symbols in the time domain, and can also be the length of one time slot, one mini time slot, one subframe, or one TTI. One TTI, one subframe, etc. can also be composed of one or more resource blocks respectively.

[0301] In addition, one or more RBs can also be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0302] In addition, a resource block can also be composed of one or more resource elements (REs). For example, one RE can also be a radio resource area of one subcarrier and one symbol.

[0303] A Bandwidth Part (BWP) (which may also be referred to as partial bandwidth, etc.) may also represent a subset of consecutive common RBs (common resource blocks) used by a certain parameter set in a certain carrier. Here, the common RBs can also be determined by the indexes of the RBs based on the common reference point of the carrier. PRBs can also be defined in a certain BWP and be numbered sequentially within that BWP.

[0304] A BWP may also include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs can also be configured within a carrier.

[0305] At least one of the configured BWPs can also be active, and the UE may not assume to transmit or receive specific signals / channels outside the active BWP. Additionally, in the present disclosure, "cell", "carrier", etc. can also be replaced with "BWP".

[0306] In addition, the structures such as the above-mentioned radio frames, subframes, time slots, mini-slots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-slots included in a time slot, the symbols included in a time slot or mini-slot, the number of RBs, the number of subcarriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be changed in various ways.

[0307] Furthermore, the information, parameters, etc. described in the present disclosure can be represented by absolute values, relative values with respect to a specific value, or can also be represented by corresponding other information. For example, radio resources can also be indicated by specific indexes.

[0308] In the present disclosure, the names used for parameters, etc. are not restrictive names in all aspects. In addition, the mathematical formulas, etc. using these parameters can also be different from those clearly disclosed in the present disclosure. Various channels (such as PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, so the various names assigned to these various channels and information elements are not restrictive names in all aspects.

[0309] The information, signals, etc. described in the present disclosure can also be represented using any one of various different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0310] In addition, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0311] The input and output information, signals, etc. can be stored in a specific location (e.g., a memory), or can be managed using a management table. The input and output information, signals, etc. can be overwritten, updated, or appended. The output information, signals, etc. can also be deleted. The input information, signals, etc. can also be sent to other devices.

[0312] The notification of information is not limited to the methods / embodiments described in this disclosure, and other methods can also be used. For example, the notification of information in this disclosure can also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0313] In addition, physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling can also be referred to as an RRC message, and can also be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration (RRC Connection Reset) message, etc. In addition, MAC signaling can also be notified, for example, using a MAC Control Element (MAC CE).

[0314] In addition, the notification of specific information (e.g., the notification of "is X") is not limited to explicit notification, and can also be performed implicitly (e.g., by not performing the notification of the specific information, or by the notification of other information).

[0315] The determination can be made by a value represented by one bit (0 or 1), by a true / false value (boolean value) represented by true or false, or by a comparison of numerical values (e.g., comparison with a specific value).

[0316] Software, whether referred to as software, firmware, middleware, micro-code, hardware description language, or by any other name, should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, processes, functions, etc.

[0317] In addition, software, instructions, information, etc. can also be transmitted and received via a transmission medium. For example, in the case of transmitting software from a website, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included in the definition of the transmission medium.

[0318] Terms such as "system" and "network" used in this disclosure can be used interchangeably. "Network" can also mean a device (e.g., a base station) included in the network.

[0319] In the present disclosure, terms such as "precoding", "precoder", "weights (precoding weights)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel" can be used interchangeably.

[0320] In the present disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0321] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services within this coverage range.

[0322] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "user device (User Equipment (UE))", "terminal" can be used interchangeably.

[0323] There are also cases where the mobile station is referred to by 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, hand set, user agent, mobile client, client, or several other appropriate terms.

[0324] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), may also be a moving body that moves in an unmanned manner (e.g., a drone, a self-driving vehicle, etc.), may also be a robot (humanoid or non-humanoid). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0325] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, for a structure in which the communication between the base station and the user terminal is replaced by the communication between multiple user terminals (e.g., it may also be referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), the various methods / embodiments of the present disclosure may also be applied. In this case, it may also be configured such that the user terminal 20 has the functions of the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to inter-terminal communication (e.g., "side"). For example, the uplink channel, the downlink channel, etc. may also be replaced by side channels.

[0326] Similarly, the user terminal in the present disclosure may also be replaced by a base station. In this case, it may also be configured such that the base station 10 has the functions of the above-mentioned user terminal 20.

[0327] In the present disclosure, an operation performed by a base station is sometimes also performed by its upper node according to circumstances. Apparently, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0328] Each mode / embodiment described in the present disclosure can be used alone, in combination, or switched during execution. In addition, the processing procedures, sequences, flowcharts, etc. of each mode / embodiment described in the present disclosure can also be reordered as long as there is no contradiction. For example, for the methods described in the present disclosure, the elements of various steps are presented in an exemplary order, but are not limited to the specific order presented.

[0329] Each mode / embodiment described in the present disclosure can also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, the fourth generation mobile communication system (4G), the fifth generation mobile communication system (5G), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, next-generation systems extended based on them, etc. In addition, multiple systems can also be combined (for example, a combination of LTE or LTE-A and 5G, etc.) for application.

[0330] The description "based on" used in the present disclosure does not mean "only based on" unless otherwise specified. In other words, the description "based on" means both "only based on" and "at least based on".

[0331] Any reference to an element using designations such as "first", "second", etc. used in the present disclosure does not comprehensively limit the quantity or order of these elements. These designations can be used in the present disclosure as a convenient method for distinguishing between two or more elements. Therefore, the reference to the first and second elements does not mean that only two elements can be adopted, or that the first element must take precedence over the second element in a certain form.

[0332] The term "determining" as used in this disclosure encompasses a variety of operations. For example, "determining" can also include cases where judging, calculating, computing, processing, deriving, investigating, looking up (searching, inquiring, such as in a table, database, or other data structure), ascertaining, etc. are considered as performing "determining".

[0333] In addition, "determining" can also include cases where receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, accessing (e.g., accessing data in a memory), etc. are considered as performing "determining".

[0334] Furthermore, "determining" can also include cases where resolving, selecting, choosing, establishing, comparing, etc. are considered as performing "determining". That is to say, "determining" can also include cases where certain operations are considered as performing "determining".

[0335] In addition, "determining" can also be replaced by "assuming", "expecting", "considering", etc.

[0336] The terms "connected" and "coupled" as used in this disclosure, or all their variations, denote all direct or indirect connections or couplings between two or more elements, and can include the situation where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination of them. For example, "connected" can also be replaced by "access".

[0337] In the present disclosure, in the case of connecting two elements, it can be considered that one or more electric wires, cables, printed electrical connections, etc. are used, and electromagnetic energy having wavelengths in the radio frequency domain, microwave region, optical (both visible and invisible) region, etc. are used as several non-limiting and non-inclusive examples to “connect” or “combine” with each other.

[0338] In the present disclosure, a term such as “A is different from B” may also mean that “A and B are different from each other”. In addition, this term may also mean that “A and B are each different from C”. Terms such as “separate” and “combine” may also be interpreted as “different” in the same way.

[0339] In the present disclosure, when using “include”, “including”, and their variants, these terms, like the term “comprising”, have an inclusive meaning. Furthermore, the term “or” used in the present disclosure does not mean exclusive or.

[0340] In the present disclosure, for example, in the case where articles are added through translation like a, an, and the in English, the present disclosure may also include cases where the nouns following these articles are in the plural form.

[0341] As described above, the invention related to the present disclosure has been described in detail. However, for those skilled in the art, the invention related to the present disclosure is clearly not limited to the embodiments described in the present disclosure. The invention related to the present disclosure can be implemented in the form of modifications and changes without departing from the gist and scope of the invention determined based on the description in the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not have any restrictive meaning for the invention related to the present disclosure.

Claims

1. A terminal, characterized in that, comprising: a receiving unit that receives a MAC control element (MAC CE) associating two transmission configuration indication (TCI) states with at least one code point, and receives a downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH) transmitted from two transmission and reception points (TRPs); and a control unit that, when a time offset between the reception of the DCI and the reception of the PDSCH is less than a threshold, determines two TCI states associated with the lowest code point among the at least one code point as quasi co-location (QCL) parameters for the PDSCH; the terminal further comprising: a transmitting unit that transmits the threshold as capability information; The PDSCH transmitted from the two TRPs is allocated to non-overlapping time domains within a single time slot.

2. The terminal according to claim 1, characterized in that the control unit determines that, when there is no information in the configured transmission configuration indication (TCI) field and the time offset between the reception of the DCI and the reception of the PDSCH is greater than or equal to the threshold, the TCI state or QCL assumption applied in the PDSCH is the same as the TCI state or QCL assumption applied in the transmission of the DCI.

3. The terminal according to claim 1, characterized in that when there is information in the configured transmission configuration indication (TCI) field and the time offset between the reception of the DCI and the reception of the PDSCH is greater than or equal to the threshold, the control unit determines the TCI state indicated by the DCI as the QCL parameter for the PDSCH.

4. A wireless communication method of a terminal, comprising: receiving a MAC control element (MAC CE) associating two transmission configuration indication (TCI) states with at least one code point; receiving a downlink control information (DCI) for scheduling a downlink shared channel (PDSCH) transmitted from two transmission and reception points (TRPs); when a time offset between the reception of the DCI and the reception of the PDSCH is less than a threshold, determining two TCI states associated with the lowest code point among the at least one code point as quasi co-location (QCL) parameters for the PDSCH; and transmitting the threshold as capability information; The PDSCH transmitted from the two TRPs is allocated to non-overlapping time domains within a single time slot.

5. A system comprising a terminal and a base station, wherein the terminal comprises: a receiving unit that receives a MAC control element (MAC CE) associating two transmission configuration indication (TCI) states with at least one code point, and receives a downlink control information (DCI) for scheduling a downlink shared channel (PDSCH) transmitted from two transmission and reception points (TRPs); A control unit, in a case where a time offset between reception of the DCI and reception of the PDSCH is less than a threshold, determines two TCI states associated with a lowest code point among the at least one code point as quasi co-location parameters, i.e., QCL parameters, for the PDSCH; and a transmission unit that transmits the threshold as capability information, The PDSCHs transmitted from the two TRPs are allocated to non-overlapping time domains within a single time slot, The base station includes: a transmission unit that transmits the DCI.

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