Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure includes a control unit that determines one or more default transmission configuration indication states, that is, one or more default TCI states, to be applied in each reception opportunity of repeated reception of a downlink shared channel, that is, a PDSCH, and a reception unit that performs the repeated reception using a spatial domain reception filter based on the one or more default TCI states. According to one embodiment of the present disclosure, a QCL parameter for a multi-panel / TRP can be appropriately determined.

Description

Technical Field

[0001] This disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems. Background Technology

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) was standardized with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) was standardized with the aim of further increasing capacity and improving the height of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] The development of successor systems to LTE is also underway (e.g., also known as the 5th generation mobile communication system (5G), 5G+, the 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 and later, etc.).

[0004] Existing technical documents

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP TS 36.300V8.12.0 "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] The problem that the invention aims to solve

[0008] In future wireless communication systems (e.g., NR), research is underway on how user terminals (user equipment (UE)) can control reception processing based on information related to quasi-co-location (QCL).

[0009] In addition, research is underway in NR on the following: one or more Transmission / Reception Points (TRPs) (multiple TRPs) using one or more panels (multiple panels) to perform DL transmission (e.g., PDSCH transmission) to the UE.

[0010] However, in the current NR specification, because multi-panel / TRP is not considered, it is impossible to properly determine the QCL parameters for multi-panel / TRP scenarios. If the QCL parameters cannot be properly determined, there are concerns about system degradation, such as reduced throughput.

[0011] Therefore, one of the purposes of this disclosure is to provide a terminal, wireless communication method, and base station for appropriately determining QCL parameters for multi-panel / TRP.

[0012] Methods for solving problems

[0013] One aspect of this disclosure relates to a terminal comprising: a control unit that determines one or more default transmission configuration indication (TCI) states to be applied during repeated reception opportunities on a downlink shared channel (Physical downlink shared channel (PDSCH)); and a receiving unit that implements the repeated reception using a spatial domain receiving filter based on the one or more default TCI states.

[0014] The effects of the invention

[0015] According to one method of this disclosure, the QCL parameters for multi-panel / TRP can be appropriately determined. Attached Figure Description

[0016] Figure 1 This is a diagram illustrating an example of the QCL concept for the DMRS port of the PDSCH.

[0017] Figure 2 This is a diagram illustrating an example of repeated DL reception using multiple reception opportunities for multiple TRPs.

[0018] Figures 3A-3D This is a diagram illustrating an example of a multi-TRP scenario.

[0019] Figure 4 This is a diagram illustrating an example of PDSCH repetition from multiple TRPs.

[0020] Figure 5 This is a diagram illustrating an example of scheme 1a with PDSCH repetition.

[0021] Figure 6A as well as Figure 6B This is a diagram illustrating an example of scheme 2a with PDSCH repetition.

[0022] Figure 7A as well as Figure 7B This is a diagram illustrating an example of scheme 2b with PDSCH repetition.

[0023] Figure 8A as well as Figure 8B This is a diagram illustrating an example of schemes 3 and 4 of the PDSCH repetition.

[0024] Figure 9A as well as Figure 9B This is a diagram illustrating an example of how the QCL parameters of multiple PDSCHs are determined.

[0025] Figure 10 This is a diagram illustrating an example of the TCI state applied in the PDSCH receiving opportunity.

[0026] Figure 11 This is a diagram illustrating an example of the TCI state applied in the PDSCH receiving opportunity.

[0027] Figure 12 This is a diagram illustrating an example of the TCI state applied in the PDSCH receiving opportunity.

[0028] Figure 13 This is a diagram illustrating an example of the TCI state applied in the PDSCH receiving opportunity.

[0029] Figure 14 This is a diagram illustrating an example of the TCI state applied in the PDSCH receiving opportunity.

[0030] Figure 15A as well as Figure 15B This is a diagram illustrating an example of the default TCI state that is repeatedly received.

[0031] Figure 16 This is a diagram illustrating an example of the order of TCI status IDs involved in implementation method 2.2.2.

[0032] Figure 17A as well as Figure 17B This is a diagram illustrating an example of the default TCI state involved in implementation 2.2.3.

[0033] Figure 18A as well as Figure 18B This is a diagram illustrating an example of the order of beam IDs involved in implementation 2.2.4.

[0034] Figure 19 This is a diagram illustrating an example of the order of CORESETs involved in implementation 2.2.5.

[0035] Figure 20 This is a diagram illustrating an example of the schematic structure of a wireless communication system according to one embodiment.

[0036] Figure 21 This is a diagram illustrating an example of the structure of a base station according to one embodiment.

[0037] Figure 22 This is a diagram illustrating an example of the structure of a user terminal according to one embodiment.

[0038] Figure 23 This is a diagram illustrating an example of the hardware structure of a base station and a user terminal according to one embodiment. Detailed Implementation

[0039] (Repeatedly received)

[0040] In Rel.16, repeated reception is supported in data reception. For example, the base station (network (NW), gNB) can also repeatedly transmit DL data (e.g., downlink shared channel (PDSCH)) a specific number of times. Alternatively, the UE can also repeatedly transmit UL data (e.g., uplink shared channel (PUSCH)) a specific number of times.

[0041] The UE can also be scheduled to receive a specific number of repeated PDSCHs through a single DCI. The number of repetitions is also called the repetition factor K or the aggregation factor K.

[0042] In addition, the nth repetition is also known as the nth reception opportunity (reception occasion), and can also be identified by the repetition index k (0≤k≤K-1).

[0043] The UE receives information representing the repetition factor K (e.g., aggregationFactorUL or aggregationFactorDL) semi-statically via higher-layer signaling. Here, the higher-layer signaling can be any one of RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information, or a combination thereof.

[0044] MAC signaling can also use MAC control elements (MAC CE) or MAC PDUs (Protocol Data Units). Broadcast information can also be in the form of master information blocks (MIBs), system information blocks (SIBs), or minimum system information (remaining minimum system information (RMSIs)).

[0045] The UE controls the reception processing of PDSCH (e.g., at least one of reception, demapping, demodulation, and decoding) or the transmission processing of PUSCH (e.g., at least one of transmission, mapping, modulation, and encoding) in K consecutive time slots based on at least one of the following field values ​​(or the information represented by that field value) within the DCI:

[0046] • Allocation of time-domain resources (e.g., start symbol, number of symbols in each time slot, etc.),

[0047] • Allocation of frequency domain resources (e.g., a specific number of resource blocks (RBs) or a specific number of resource block groups (RBGs)).

[0048] • Modulation and Coding Scheme (MCS) Index

[0049] • The structure (configuration) of the PDSCH / PUSCH demodulation reference signal (DMRS).

[0050] • Spatial relation info of PDSCH / PUSCH, or the status of transmission configuration indicator (TCI: Transmission Configuration Indication or Transmission Configuration Indicator) (TCI-state)

[0051] The same symbol allocation can be applied across K consecutive time slots. The UE can also determine the symbol allocation in each time slot based on the starting symbol S, determined by the value m of a specific field (e.g., the Time Domain Resource Allocation (TDRA) field) within the DCI, and the number of symbols L (e.g., the Start and Length Indicator (SLIV)). Alternatively, the UE can determine the initial time slot based on K2 information, determined by the value m of a specific field (e.g., the TDRA field) within the DCI.

[0052] On the other hand, the redundancy version (RV) applied to the TB based on the same data can be the same or at least partially different across the K consecutive time slots. For example, the RV applied to the TB in the nth time slot (reception opportunity, repetition) can also be determined based on the value of a specific field (e.g., the RV field) within the DCI.

[0053] (TCI, QCL)

[0054] In NR, research is underway on controlling the reception processing (e.g., at least one of receiving, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmitting, mapping, precoding, modulation, and encoding) of at least one of the signals and channels (referred to as signal / channel) in the UE based on the Transmission Configuration Indication state (TCI state).

[0055] TCI states can also represent elements of signals / channels applied to the downlink. Elements corresponding to TCI states of signals / channels applied to the uplink can also be described as spatial relations.

[0056] TCI status refers to information related to the quasi-co-location (QCL) of signals / channels, and can also be referred to as spatial reception parameters, spatial relation information, etc. TCI status can also be set by the UE for each channel or each signal.

[0057] QCL refers to an indicator representing the statistical properties of a signal / channel. For example, when a signal / channel has a QCL relationship with other signals / channels, it can also mean that among these different signals / channels, at least one of the following can be assumed to be the same (at least one of these is the QCL): Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter).

[0058] Alternatively, the spatial reception parameters can correspond to the UE's receive beam (e.g., receive analog beam), or the beam can be determined based on the spatial QCL. The QCL (or at least one element of the QCL) in this disclosure can also be replaced with sQCL (spatial QCL).

[0059] QCL can also be specified in multiple types (QCL types). For example, four different QCL types (AD) can be set that can be assumed to have the same parameters (or parameter sets). The following is an explanation of how these parameters (also called QCL parameters) are represented:

[0060] • QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread.

[0061] • QCL Type B (QCL-B): Doppler shift and Doppler extension.

[0062] • QCL Type C (QCL-C): Doppler shift and average delay,

[0063] • QCL type D (QCL-D): Space reception parameters.

[0064] The assumption that a UE envisions a specific QCL (e.g., QCL type D) relationship between a Control Resource Set (CORESET), channel, or reference signal and other CORESETs, channels, or reference signals can also be referred to as a QCL assumption.

[0065] 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.

[0066] TCI status can also be, for example, QCL-related information between the target channel (in other words, the reference signal (RS) used by the channel) and other signals (e.g., other RS). TCI status can also be set (indicated) by higher-layer signaling, physical-layer signaling, or a combination thereof.

[0067] In this disclosure, higher-layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0068] MAC signaling can also use MAC Control Element (MAC CE) or MAC Protocol Data Unit (PDU). Broadcast information can also be, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), or Other System Information (OSI).

[0069] Physical layer signaling can also be, for example, downlink control information (Downlink Control Information (DCI)).

[0070] The channel that is set (specified) to TCI state or spatial relationship can be, for example, at least one of the following: downlink shared channel (Physical Downlink Shared Channel (PDSCH))), downlink control channel (Physical Downlink Control Channel (PDCCH))), uplink shared channel (Physical Uplink Shared Channel (PUSCH))), and uplink control channel (Physical Uplink Control Channel (PUCCH))).

[0071] Furthermore, the RS that is related to the channel as QCL can be at least one of the following: a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), a Measurement Reference Signal (Sounding Reference Signal (SRS)), a Tracking CSI-RS (also known as a Tracking Reference Signal (TRS)), or a QCL Detection Reference Signal (also known as a QRS).

[0072] An SSB is a block of signals that contains at least one Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), and broadcast channel (Physical Broadcast Channel (PBCH)). An SSB can also be referred to as an SS / PBCH block.

[0073] The UE can also receive configuration information (e.g., PDSCH-Config, tci-StatesToAddModList) containing a list of information elements of TCI state via higher-layer signaling.

[0074] The TCI state information element (RRC's "TCI-stateIE") set via higher-layer signaling may also include a TCI state ID and one or more QCL information ("QCL-Info"). The QCL information may also include at least one information related to the RS that forms a QCL relationship (RS relationship information) and information indicating the QCL type (QCL type information). The RS relationship information may also include the RS's index (e.g., SSB index, Non-Zero-Power (NZP) CSI-RS resource ID (Identifier)), the cell index of the RS, and the index of the Bandwidth Part (BWP) of the RS.

[0075] In Rel.15NR, as a TCI state of at least one of PDCCH and PDSCH, both RS of QCL type A and RS of QCL type D, or only RS of QCL type A, can be set in the UE.

[0076] When the TRS is set as the RS of QCL type A, the TRS is different from the DeModulation Reference Signal (DMRS) of PDCCH or PDSCH. It is assumed that the same TRS is transmitted periodically over a long period of time. The UE can measure the TRS and calculate the average delay, delay spread, etc.

[0077] For a UE whose TRS is set as a QCL type A RS for the DMRS of PDCCH or PDSCH, it can be assumed that the DMRS of PDCCH or PDSCH has the same parameters (average delay, delay spread, etc.) as the QCL type A parameters of the TRS. Therefore, based on the measurement results of the TRS, the type A parameters (average delay, delay spread, etc.) of the DMRS of PDCCH or PDSCH can be calculated. When performing channel estimation for at least one of PDCCH and PDSCH, the UE can use the measurement results of the TRS to perform more accurate channel estimation.

[0078] A UE with a QCL type D RS can use the QCL type D RS to determine the UE receive beam (spatial domain receive filter, UE spatial domain receive filter).

[0079] The RS of QCL type X in TCI state can also refer to the RS that is in a QCL type X relationship with a certain channel / signal (DMRS), and this RS can also be called the QCL source of QCL type X in TCI state.

[0080] <TCI status for PDCCH>

[0081] Information related to 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 status for the PDCCH, etc.

[0082] The UE can also determine the TCI state for a UE-specific PDCCH (CORESET) based on higher-layer signaling. For example, a UE can also have one or more (K) TCI states set for each CORESET via RRC signaling.

[0083] For each CORESET, the UE can also be activated via a MAC CE, which is one of several TCI states set by RRC signaling. This MAC CE can also be referred to as the UE-specific PDCCH TCI State Indication MAC CE. The UE can also monitor the CORESET based on the activated TCI state corresponding to that CORESET.

[0084] <TCI status for PDSCH>

[0085] Information related to 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 status for the PDSCH, etc.

[0086] The UE can also be notified (set) M (M≥1) TCI states (M QCL information for PDSCH) via higher-layer signaling. In addition, the number M of TCI states set in the UE can also be limited by at least one of the UE capability and QCL type.

[0087] The DCI used in PDSCH scheduling can also contain a field indicating the TCI status of the PDSCH (e.g., it can also be called a TCI field, TCI status field, etc.). This DCI can also be used in the scheduling of PDSCH in a cell, for example, it can also be called DL DCI, DL allocation, DCI format 1_0, DCI format 1_1, etc.

[0088] Whether a TCI field is included in the DCI can also be controlled by information notified to the UE from the base station. This information can also be information indicating whether the TCI field exists (present or absent) within the DCI (e.g., TCI field presence information, TCI presence information within the DCI, higher-layer parameter TCI-PresentInDCI). This information can also be set to the UE, for example, via higher-layer signaling.

[0089] When more than 8 TCI states are set on the UE, fewer than 8 TCI states can also be activated (or specified) using MAC CE. This MAC CE can also be referred to as UE-specific PDSCH MAC CE (TCI States Activation / Deactivation for UE-specific PDSCH). The value of the TCI field within the DCI can also represent one of the TCI states activated by the MAC CE.

[0090] If the UE has information that the TCI field is set to "enabled" for the CORESET of the scheduled PDSCH (the CORESET used in the PDCCH transmission of the scheduled PDSCH), the UE can also assume that the TCI field exists in the DCI format 1_1 of the PDCCH transmitted on that CORESET.

[0091] If the TCI field information is not set for the CORESET of the scheduled PDSCH, or if the PDSCH is scheduled via DCI format 1_0, and the time offset between the reception of the DL DCI (the DCI that schedules the PDSCH) and the reception of the PDSCH corresponding to that DCI is greater than or equal to a threshold, in order to determine the QCL of the PDSCH antenna port, the UE may also assume that the TCI state or QCL assumption for the PDSCH is the same as the TCI state or QCL assumption applied to the CORESET used in the PDCCH transmission that schedules the PDSCH.

[0092] When the TCI field information is set to "enabled", the TCI field in the DCI within the component carrier (CC) of the scheduled (PDSCH) indicates the active TCI state within the scheduled CC or DL ​​BWP, and the PDSCH is scheduled via DCI format 1_1. In order to determine the QCL of the PDSCH antenna port, the UE may also use the TCI value according to the TCI field value of the PDCCH with detected DCI. If the time offset between the reception of the DL DCI (scheduling the PDSCH) and the PDSCH corresponding to the DCI (scheduled via the DCI) is greater than or equal to a threshold, the UE may also assume that the DM-RS port of the serving cell's PDSCH is QCL in the TCI state associated with the QCL type parameter given by the indicated TCI state.

[0093] When a UE is configured with a single-slot PDSCH, the indicated TCI state can also be based on the active TCI state within the slot containing the scheduled PDSCH. When a UE is configured with multiple-slot PDSCHs, the indicated TCI state can also be based on the active TCI state within the initial slot containing the scheduled PDSCHs, and the UE can expect the indicated TCI state to be the same within the slot containing the scheduled PDSCHs. When a UE is configured with a CORESET associated with a search space set for cross-carrier scheduling, the TCI field presence information is set to "valid" for that CORESET. If at least one of the TCI states configured for the serving cell scheduled through the search space set includes QCL type D, the UE can also assume that the time offset between the detected PDCCH and the corresponding PDSCH is greater than a threshold.

[0094] In RRC connection mode, in both the case where the TCI information (higher-layer parameter TCI-PresentInDCI) within the DCI is set to "enabled" and the case where the TCI information within the DCI is not set, if the time offset between the reception of the DL DCI (the DCI that schedules the PDSCH) and the corresponding PDSCH (the PDSCH scheduled through this DCI) is less than a threshold, the UE can also assume that: the DM-RS port of the serving cell's PDSCH is a QCL with the following RS, which is the RS associated with the CORESET associated with the monitored search space and related to the QCL parameters used in the QCL indication of the PDCCH, and this CORESET has the lowest CORESET-ID in the latest (lowest) timeslot of more than one CORESET monitored by the UE within the active BWP of the serving cell. Figure 1 This RS can also be referred to as the default TCI state of PDSCH or the default QCL assumption of PDSCH.

[0095] The time offset between the reception of a DL DCI and the reception of the corresponding PDSCH can also be called the scheduling offset.

[0096] In addition, the above thresholds can also be referred to as QCL time duration, "timeDurationForQCL", "threshold", "threshold for offset between a DCI indicating a TCIstate and a PDSCH scheduled by the DCI", "threshold-Sched-Offset", scheduling offset threshold, scheduling offset threshold, etc.

[0097] The QCL usage time length can be based on UE capabilities, such as the delays associated with PDCCH decoding and beam switching. The QCL usage time length can also be the minimum time necessary for the UE to perform PDCCH reception and the application of spatial QCL information received within the DCI used for PDSCH processing. The QCL usage time length can be expressed in symbols per subcarrier interval or in time (e.g., μs). This QCL usage time length information can be reported from the UE to the base station as UE capability information, or it can be set by the base station to the UE using higher-layer signaling.

[0098] For example, the UE can also be envisioned as follows: the DMRS port of the aforementioned PDSCH is QCL with the following DL-RS, which is a DL-RS based on the TCI state activated for the CORESET corresponding to the aforementioned minimum CORESET-ID. The latest timeslot can also be, for example, the timeslot for receiving the DCI that schedules the aforementioned PDSCH.

[0099] Alternatively, CORESET-ID can also be an ID set through the RRC information element "ControlResourceSet" (the ID used to identify CORESET, controlResourceSetId).

[0100] If no CORESET is set for a CC, the default TCI state can also be the activated TCI state with the lowest ID that can be applied in the PDSCH within the active DL BWP of that CC.

[0101] After Rel.16, when the PDSCH and the PDCCH scheduled for it are in different component carriers (CC) (cross-carrier scheduling), if the delay from PDCCH to PDSCH (PDCCH-to-PDSCH delay) is less than the QCL usage time, or if there is no TCI state in the DCI used for scheduling, the UE can also obtain the QCL assumption for the scheduled PDSCH with the lowest ID that can be applied in the active BWP of the scheduled cell.

[0102] (Service(Traffic Type)))

[0103] In future wireless communication systems (e.g., NR), we envision further enhancements to mobile broadband (e.g., enhanced Mobile Broadband (eMBB)), enabling massively simultaneous machine-type communications (e.g., massive Machine-Type Communications (mMTC), Internet of Things (IoT)), and ultra-reliable and low-latency communications (e.g., ultra-reliable and low-latency communications (URLLC)) – service types (also referred to as types, services, service types, communication types, use cases, etc.). For example, URLLC requires lower latency and higher reliability compared to eMBB.

[0104] The business type can also be identified at the physical layer based on at least one of the following.

[0105] • Logical channels with different priorities

[0106] • Modulation and Coding Scheme (MCS) Table (MCS Index Table)

[0107] Channel Quality Indication (CQI) Table

[0108] DCI format

[0109] • The radio network temporary identifier (RNTI) used in the scrambling (mask) of the (additional) Cyclic Redundancy Check (CRC) bits included in the DCI (DCI format) (e.g., System Information (SI) - RNTI).

[0110] • RRC (Radio Resource Control) parameters

[0111] • Specific RNTIs (e.g., RNTIs used in URLLC, MCS-C-RNTIs, etc.)

[0112] Search Space

[0113] • Fields within the DCI (e.g., newly added fields or reuse of existing fields)

[0114] Service types can also be associated with communication requirements (such as delay and error rate) and data types (such as voice and data).

[0115] The difference between the requirements of URLLC and eMBB can be that the latency of URLLC is less than that of eMBB, or that the requirements of URLLC include reliability requirements.

[0116] (Multiple TRPs)

[0117] In NR, research is underway on using one or more Transmission / Reception Points (TRPs) (multiple TRPs) with one or more panels (multiple panels) to perform DL (Low-Level Transmission) to the UE. Additionally, research is underway on the UE performing UL (Low-Level Transmission) to one or more TRPs.

[0118] Figure 2 This example illustrates a UE repeatedly receiving data using four reception occasions across four TRPs. A reception occasion can also be a unit of repeated reception. Multiple reception occasions can also be achieved by applying at least one of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), Space Division Multiplexing (SDM), etc. Reception occasions can also be interchanged with reception occasions, Rx occasions, etc.

[0119] Furthermore, multiple TRPs can correspond to the same cell identifier (cell Identifier(ID)) or different cell IDs. This cell ID can be either a physical cell ID or a virtual cell ID.

[0120] Figures 3A-3D This diagram illustrates one 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.

[0121] Figure 3A This example illustrates a scenario where only one TRP (TRP1 in this example) transmits data to the UE in a multi-TRP configuration (also known as single-mode, single TRP, etc.). In this case, TRP1 transmits both the control signal (PDCCH) and the data signal (PDSCH) to the UE.

[0122] Figure 3B This illustrates an example of a scenario where only one TRP (TRP1 in this example) in a multi-TRP system sends control signals to the UE, while the multi-TRP system sends data signals (also known as single-master mode). The UE receives each PDSCH sent from the multi-TRP system based on a downlink control information (DCI) message.

[0123] Figure 3C This illustrates an example of a multi-TRP (Multi-Terrain Protocol) model where each TRP transmits a portion of its control signal to the UE, while the TRP also transmits data signals (also known as master-slave mode). Alternatively, portion 1 of the control signal (DCI) can be transmitted in TRP1, and portion 2 of the control signal (DCI) can be transmitted in TRP2. Portion 2 of the control signal can also depend on portion 1. The UE receives each PDSCH transmitted from the multi-TRP based on these portions of the DCI.

[0124] Figure 3D This illustrates an example of a scenario where each of the multiple TRPs sends a different control signal to the UE, and the multiple TRPs also send data signals (also known as multi-master mode). Alternatively, a first control signal (DCI) can be sent in TRP1, and a second control signal (DCI) can be sent in TRP2. The UE uses these DCIs to receive the various PDSCHs sent from the multiple TRPs.

[0125] Using a DCI to schedule from Figure 3B In the case of multiple PDSCHs in a multi-TRP scenario (also known as multiple PDSCHs), the DCI can also be referred to as a single DCI (S-DCI, single PDCCH). Furthermore, when using multiple DCIs to schedule data from different sources... Figure 3D In the case of multiple PDSCHs in such a multi-TRP configuration, these multiple DCIs can also be referred to as multiple DCIs (M-DCI, multiple PDCCH).

[0126] Different code words (CWs) and different layers can also be transmitted separately from each TRP in a multi-TRP system. As one method of multi-TRP transmission, non-coherent joint transmission (NCJT) is being investigated.

[0127] In NCJT, for example, TRP1 performs modulation mapping on the first codeword and layer mapping, and transmits the first PDSCH using the first precoding on a first number of layers (e.g., 2 layers). Furthermore, TRP2 performs modulation mapping on the second codeword and layer mapping, and transmits the second PDSCH using the second precoding on a second number of layers (e.g., 2 layers).

[0128] Furthermore, multiple PDSCHs (multiple PDSCHs) of NCJT can also be defined as partially or completely overlapping in terms of at least one of the time and frequency domains. That is, at least one of the time and frequency resources of the first PDSCH from the first TRP and the second PDSCH from the second TRP can also overlap.

[0129] It can also be envisioned that these first PDSCHs and second PDSCHs are not in a quasi-co-location (QCL) relationship (not quasi-co-located). The reception of multiple PDSCHs can also be replaced by the simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0130] (PDSCH iterations across multiple TRPs)

[0131] PDSCH repetitions supporting multiple TRPs are under investigation. At least one of the following repetition methods (schemes) across multiple TRPs in the frequency domain, layer (spatial) domain, or time domain can also be supported.

[0132] • Iteration by space division multiplexing (SDM): Scheme 1a (SDM scheme)

[0133] • Iterations of frequency division multiplexing (FDM): Scheme 2a (FDM scheme A) and 2b (FDM scheme B)

[0134] • Repeated use of time division multiplexing (TDM): Scheme 3 (TDM Scheme A) and Scheme 4 (TDM Scheme B)

[0135] At least one of these schemes can also be supported for URLLC.

[0136] For example, such as Figure 4 As shown, as a PDSCH repeat, repeats #1 and #2 of codeword (CW) #1 are sent from TRP #1 and TRP #2 respectively.

[0137] [Option 1a]

[0138] This scheme can also be used within a single time slot, using n (n <= N). s (Number of spatial resources, number of layers, number of layer sets) TCI states, using overlapping time and frequency resources for allocation. Each receiver opportunity can also be a layer, or a set of layers 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 with a redundancy version (RV) can also be used across all spatial layers or layer sets. From the UE's perspective, different coded bits are mapped to different layers or different layer sets using the same mapping rules as Rel.15.

[0139] For example, such as Figure 5 As shown, Figure 4 Repeats #1 and #2 are mapped to layers #1 and #2 in overlapping time and frequency resources, respectively. The UE uses TCI state #1 and RV #0 to receive repeat #1, and uses TCI state #2 and RV #0 to receive repeat #2. Different TCI states and the same RV are used for repeats #1 and #2.

[0140] [Option 2]

[0141] This scheme can also be used within a single time slot, using n (n <= N). f (Number of frequency resources) TCI states, using non-overlapping frequency resource allocations. Each non-overlapping 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-overlapping frequency resource allocations.

[0142] [[Option 2a]]

[0143] A single codeword accompanying an RV can also be used across the entire resource configuration. From the UE's perspective, common resource block (RB) mappings (mapping from the same codewords as Rel.15 to the layer) can also be applied across the entire resource configuration.

[0144] [[Option 2b]]

[0145] A single codeword accompanying a RV can also be used in various non-overlapping frequency resource configurations. The RVs corresponding to each non-overlapping frequency resource configuration can be the same or different.

[0146] [[Frequency Resource Allocation]]

[0147] Frequency resource allocation can also be comb-like across multiple TRPs. For a wideband precoding resource block group (PRG), the initial ceil(N) RB / 2) RBs can also be assigned to TCI state 1, and the remaining floor(N) RB / 2) RBs can also be assigned to TCI state 2. For PRG size = 2 or 4, even-indexed PRGs within the configured frequency domain resource allocation (FDRA) can also be assigned to TCI state 1, and odd-indexed PRGs within the configured FDRA can also be assigned to TCI state 2.

[0148] The precoder granularity P (PRG size) can also be one of the values ​​{2, 4, wide}. When P is 2 or 4, the PRG divides the BWP into P consecutive PRBs.

[0149] When using scheme 2a, for example, such as Figure 6A as well as Figure 6B As shown, Figure 4 Repeats #1 and #2 are mapped to non-overlapping frequency resource configurations #1 and #2 in overlapping time resources, respectively. The UE uses TCI state #1 and RV #0 to receive repeat #1, and uses TCI state #2 and RV #0 to receive repeat #2. Different TCI states and the same RV are used for repeats #1 and #2.

[0150] When using scheme 2b, for example, as Figure 7A as well as Figure 7B As shown, Figure 4 Repeats #1 and #2 are mapped to non-overlapping frequency resource configurations #1 and #2 in overlapping time resources, respectively. The UE uses TCI state #1 and RV #0 to receive repeat #1, and uses TCI state #2 and RV #3 to receive repeat #2. Different TCI states and different RVs are used for repeats #1 and #2.

[0151] like Figure 6A as well as Figure 7A As shown, in the case of broadband precoder granularity (using broadband PRG), non-overlapping frequency resource configuration #1 is the first half of the continuous PRB of the BWP, and non-overlapping frequency resource configuration #2 is the second half of the continuous PRB of the BWP. Figure 6B as well as Figure 7B As shown, when the precoder granularity is 2 or 4 (PRG size is 2 or 4), non-overlapping frequency resource configuration #1 is an even-indexed PRG, and non-overlapping frequency resource configuration #2 is an odd-indexed PRG.

[0152] [Option 3]

[0153] This scheme can also be used within a single time slot, using n (n <= N). t1 (Number of time resources) TCI states, and non-overlapping time resources are configured (allocated). Each receiver opportunity in a TB can also use mini-slot time granularity, with one TCI state and one RV. All receiver opportunities within a slot can also use a common MCS with the same single or multiple DMRS ports. At least one RV and TCI state can be the same or different among multiple receiver opportunities.

[0154] For example, such as Figure 8A As shown, Figure 4 Repeats #1 and #2 are mapped to reception opportunities #1 and #2 within a time slot, respectively. The UE uses TCI state #1 and RV #0 to receive repeat #1, and uses TCI state #2 and RV #3 to receive repeat #2. Different TCI states and different RVs are used for repeats #1 and #2.

[0155] [Option 4]

[0156] This scheme can also be used in K (n <= K) different time slots, using n (n <= N) t2 (Number of time resources) TCI states. Each receiver in a TB can also have one TCI state and one RV. All receivers across K time slots can also use a common MCS with the same single or multiple DMRS ports. At least one RV and TCI state can be the same or different among multiple receivers.

[0157] For example, such as Figure 8B As shown, Figure 4 Repeats #1 and #2 are mapped to reception opportunities #1 in the first time slot and #2 in the second time slot, respectively. The UE uses TCI state #1 and RV #0 to receive repeat #1, and uses TCI state #2 and RV #3 to receive repeat #2. Different TCI states and different RVs are used for repeats #1 and #2.

[0158] In such a multi-TRP scenario, more flexible transmission control is possible when using high-quality channels.

[0159] NCJT using multiple TRPs / panels may employ high rank. To support both ideal and non-ideal backhaul between multiple TRPs, both single DCI (single PDCCH) and multiple DCI (multiple PDCCH) configurations can also be supported. For both single and multiple DCI configurations, the maximum number of TRPs can be 2.

[0160] For single PDCCH designs (primarily for ideal backhaul), TCI extensions are being investigated. Each TCI code point within the DCI can also correspond to one or two TCI states. The TCI field size can also be the same as the TCI field size in Rel.15.

[0161] For single PDCCH designs (primarily for ideal backhaul), DMRS extensions are under investigation. The UE can also support combinations of layers from two TRPs indicated via the antenna port field. For single codeword (CW) and single user (SU), if expressed as "number of layers in TRP1 + number of layers in TRP2", the combination of layers in TRP1 and TRP2 can be any of 1+1, 1+2, 2+1, or 2+2. There is no consensus on supporting combinations of at least one layer from two TRPs (1+3 and 3+1) indicated via the antenna port field, support for multi-user (MU) scenarios, or support for two CWs. The size of the antenna port field can also be the same as in Rel.15.

[0162] For multi-PDCCH designs (both ideal and non-ideal backhaul), the maximum number of CORESETs for each PDCCH configuration (PDCCH-Config) can be increased to 5, depending on the UE capability. The maximum number of CORESETs that can be set with the same TRP can also be up to the number reported by the UE capability. The same TRP can also be the same higher-level index (e.g., CORESET pool index) set per PDCCH and, if settable, per CORESET. The UE capability can also include at least three candidate values.

[0163] For multi-PDCCH designs (both ideal and non-ideal backhaul), the maximum number of resources for at least one BD and CCE per serving cell and per time slot can also be increased, depending on the UE's capabilities.

[0164] For designs based on multiple PDCCHs only, the extension of PDSCH is being investigated.

[0165] The total number of CWs within multiple scheduled PDSCHs can also be up to 2. Each PDSCH is scheduled through a PDCCH. The total number of multi-input multi-output (MIMO) layers of the scheduled PDSCHs can also be up to the number reported through the UE's MIMO capabilities. There is no consensus on increasing the maximum number of HARQ procedures in Rel.16.

[0166] The UE can also support different PDSCH scrambling sequences for multiple PDSCHs. The UE can also support extensions for setting RRC settings for multiple dataScramblingIdentityPDSCHs. Each dataScramblingIdentityPDSCH can also be associated with a higher-level index (CORESET pool index) of each CORESET and applied in PDSCHs scheduled using DCIs detected on CORESETs with the same higher-level index.

[0167] For PDSCH resource configuration (allocation), the UE can also support multiple PDSCHs, which are at least one of fully overlapped, partially overlapped, or non-overlapped in the time and frequency domains.

[0168] Regarding rate matching, for LTE cell-specific reference signals (CRS), the CRS mode information (lte-CRS-ToMatchAround) used for multiple CRS modes within the configured serving cell can also be extended. CRS mode information consists of parameters used to determine the CRS mode, and the UE can also perform rate matching around the CRS mode.

[0169] For designs based on multiple PDCCHs only, an extension of PUCCH is being investigated.

[0170] Both combined ACK / NACK (HARQ-ACK) feedback and independent ACK / NACK feedback are supported. RRC signaling can also be used in the switching between combined and independent feedback. For combined ACK / NACK feedback, both semi-static HARQ-ACK codebooks and dynamic HARQ-ACK codebooks are supported. For independent ACK / NACK feedback, the higher-level index of each CORESET used in the generation of the separated HARQ-ACK codebook can also be set. Both semi-static and dynamic HARQ-ACK codebooks are supported. Two long PUCCHs TDMed within a time slot are also supported. Both short and long PUCCHs TDMed within a time slot are also supported.

[0171] (Default QCL for multi-TRP based on a single DCI)

[0172] For multi-TRP / panel transmission based on a single DCI, which includes a serving cell with QCL type D set for the scheduled PDSCH and uses at least one TCI state, after receiving the activation command for the TCI state used by the UE-specific PDSCH, if the time offset between the received PDCCH and the corresponding PDSCH is less than the threshold (timeDurationForQCL), the UE may also assume that the DMRS port of the PDSCH follows the QCL parameters indicated by the default TCI state below. The UE may also use the TCI state corresponding to the lowest of two different TCI states activated for PDSCH as the default TCI state. When all TCI states are mapped to a single TCI state, the default TCI state may also follow the action of Rel.15. Using a default TCI state for multiple PDSCHs based on a single DCI may also be part of the UE's capability.

[0173] For multi-TRP / panel transmission based on a single DCI, if the time offset between the PDCCH reception and the corresponding PDSCH is above a threshold, the UE can also assume that the DMRS port of the PDSCH follows one or two TCI states corresponding to the TCI code points indicated by the TCI field in the PDCCH.

[0174] For multi-TRP / panel transmission based on multiple DCI, with a CORESET pool index set and the time offset between PDCCH reception and the corresponding PDSCH less than a threshold, the UE can also assume that the DM-RS port of the PDSCH is a QCL with the following RS: RS associated with the QCL parameter used in the PDCCH of the lowest CORESET index in the CORESET; and CORESET being one or more CORESETs associated with the CORESET pool index within the active BWP of the serving cell, each having the same CORESET pool index set in the latest timeslot monitored by the UE. Support for this function can also be indicated (reported) through UE capabilities. If the UE does not support this function, the Rel.15 action can be reused regardless of the CORESET pool index.

[0175] Figure 9A And 9B is a diagram illustrating an example of the default QCL for multiple PDSCHs based on a single DCI. Figure 9A And the example shown in 9B corresponds to Figure 3B The example shown is a single PDCCH.

[0176] 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).

[0177] DCI1 schedules the reception of PDSCH1 and PDSCH2. The scheduling offset 1 from the reception of DCI1 up to PDSCH1 is less than the scheduling offset threshold. In addition, the scheduling offset 2 from the reception of DCI1 up to PDSCH2 is less than the scheduling offset threshold.

[0178] Figure 9B Shown in Figure 9A The example illustrates the correspondence between the TCI field, TCI code point, and TCI state of DCI1. In this example, the lowest code point among the two different TCI states activated for 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.

[0179] (Default QCL for multiple TRPs where TCI code points represent two TCI states)

[0180] For multi-TRP / panel transmissions using at least one TCI state, where the serving cell with a QCL type D set for the scheduled PDSCH is a serving cell with a QCL type D, and where the time offset between the reception of the DL DCI and the PDSCH corresponding to the DL DCI is less than a threshold (timeDurationForQCL), and at least one TCI code point represents two TCI states, the UE can also assume that the DMRS port of the PDSCH is the QCL of the RS associated with the QCL parameter, which is associated with the TCI state corresponding to the lowest code point among two different TCI states.

[0181] Furthermore, for multi-TRP / panel transmission, if the time offset between the reception of the DL DCI and the PDSCH corresponding to the DL DCI is greater than or equal to a threshold (timeDurationForQCL), the UE can also assume that the DMRS port of the PDSCH is the QCL of the RS in the TCI state associated with the QCL type parameter, given by the indicated TCI state within the DL DCI.

[0182] Here, the threshold can also be limited based on UE capability information reports.

[0183] When the UE is configured with a single slot PDSCH, the indicated TCI state can also be based on the active TCI state in the slot of the scheduled PDSCH.

[0184] Furthermore, in the case of a PDSCH with multiple slots, the indicated TCI state can also be based on the active TCI state in the initial slot of the scheduled PDSCH, and the UE can expect the same active TCI state to be applied across the slots of the scheduled PDSCH.

[0185] However, in NR versions after Rel.16, research is underway to support a maximum of two or more TCI states for a single TCI code point. However, research on the methods for setting the TCI states in this case is still insufficient. If this research is insufficient, the increase in communication throughput will be suppressed.

[0186] Furthermore, the use of MAC CE to indicate the TCI state for PDSCH is being investigated. However, a control method for the TCI state to suppress the overhead caused by this MAC CE indication method is desired.

[0187] Therefore, the inventors of this invention have devised a method for appropriately determining the TCI state for multiple PDSCH reception opportunities utilizing multiple TRPs.

[0188] Hereinafter, with reference to the accompanying drawings, the embodiments involved in this disclosure will be described in detail. The wireless communication methods involved in each embodiment can be applied individually or in combination.

[0189] In this disclosure, the following terms can be interchanged: panel, uplink (UL) transmitting entity, TRP, spatial relationship, control resource set (CORESET), PDSCH, codeword, base station, antenna port of a signal (e.g., DeModulation Reference Signal (DMRS) port), antenna port group of a signal (e.g., DMRS port group), group for multiplexing (e.g., Code Division Multiplexing (CDM) group, reference signal group, CORESET group), CORESET pool, CW, redundancy version (RV)), and layer (MIMO layer, transmitting layer, spatial layer). Furthermore, the panel identifier (ID) and panel can also be interchanged. In this disclosure, the TRP ID and TRP can also be interchanged.

[0190] In this disclosure, NCJT, NCJT using multiple TRPs, multiple PDSCH using NCJT, multiple PDSCH, and multiple PDSCH from multiple TRPs can be used interchangeably. Furthermore, multiple PDSCH can refer to multiple PDSCHs multiplexed through at least one of SDM, FDM, or TDM; multiple PDSCHs transmitting the same TB or the same CW; or multiple PDSCHs with different UE receive beams (spatial domain receive filters, QCL parameters, TCI states).

[0191] In this disclosure, the default TCI state can also be used interchangeably with the default QCL, the default QCL assumption, the default spatial relationship, and the default unified TCI state. Hereinafter, this TCI state or QCL (QCL assumption) will be referred to as the default TCI state, but the terminology is not limited to this.

[0192] Furthermore, the definition of the default TCI state is not limited to this. The default TCI state can be, for example, the TCI state envisioned when a channel / signal (e.g., PDSCH) cannot utilize the TCI state / QCL specified by the DCI, or the TCI state envisioned when no TCI state / QCL is specified (or set).

[0193] In this disclosure, cell, CC, carrier, BWP, and frequency band can be interchanged.

[0194] In this disclosure, index, ID, indicator, and resource ID can be used interchangeably.

[0195] TCI status, TCI status or QCL designation, QCL designation, QCL parameters, spatial domain receive filter, UE spatial domain receive filter, spatial domain filter, UE receive beam, DL receive beam, DL precoding, DL precoder, DL-RS, QCL parameters on which the DMRS port is based, RS of QCL type D in TCI status or QCL designation, RS of QCL type A in TCI status or QCL designation can also be interchanged. RS of QCL type D, DL-RS associated with QCL type D, DL-RS with QCL type D, source of DL-RS, SSB, CSI-RS can also be interchanged.

[0196] In this disclosure, the TCI status can also be information related to the receive beam (spatial domain receive filter) indicated (set) to the UE (e.g., DL-RS, QCL type, cell in which the DL-RS is transmitted, etc.). The QCL assumption can also be information related to the receive beam (spatial domain receive filter) assumed by the UE (e.g., DL-RS, QCL type, cell in which the DL-RS is transmitted, etc.) based on the transmission or reception of associated signals (e.g., PRACH).

[0197] In this disclosure, the latest time slot, the most recent time slot, the latest search space, and the most recent search space can also be used interchangeably.

[0198] (Wireless communication method)

[0199] In one or more embodiments of this disclosure, the UE may also satisfy at least one of the following conditions 1-5 (in other words, if at least one of the following conditions 1-5 is satisfied, the UE may also operate based on at least one of the following embodiments):

[0200] [Condition 1] This applies when the scheduling offset of the DCI for PDSCH is less than a certain threshold (e.g., timeDurationForQCL).

[0201] [Condition 2] For UEs where the TCI field is not configured to contain information (tci-PresentInDCI),

[0202] [Condition 3] is set up for multiple TRPs used in URLLC.

[0203] [Condition 4] The information that enables the switching of the default TCI state in Rel.16 (in other words, the action based on at least one of the following implementation methods) is configured through new higher-level signaling (e.g., RRC signaling).

[0204] [Condition 5] indicates that the UE capability information that enables the switching of the default TCI state is reported to the network.

[0205] Regarding condition 3 above, for example, it could also be a case where a specific high-level parameter (e.g., PDSCH-Config) is set for the UE. This specific high-level parameter (e.g., PDSCH-Config) could also be an entry in pdsch-TimeDomainAllocationList containing RepNumR16 within at least one PDSCH-TimeDomainResourceAllocation element [condition 3-1].

[0206] Furthermore, regarding condition 3 above, for example, it could also be the following situation: For the UE, multiple (e.g., two) TCI states and specific DCI fields (e.g., "Transmission Setting Indication") are set together through other DCI fields (e.g., "Time Domain Resource Allocation"), and more than one DMRS port within a CDM group in the DCI field "Antenna Port" is set. This other DCI field (e.g., "Time Domain Resource Allocation") could also be an entry in the pdsch-TimeDomainAllocationList containing RepNumR16 within at least one PDSCH-TimeDomainResourceAllocation element [condition 3-2].

[0207] Regarding conditions 3-1 and 3-2 above, they can be applied individually or in combination for the UE.

[0208] <First Implementation>

[0209] In this embodiment, the UE can also use the default TCI state scheme in Rel.16 to control transmission and reception.

[0210] Furthermore, in this embodiment, the case where the number of PDSCH reception opportunities (PDSCH repetitions) is 4 or 2 is used as an example for explanation, but the number of PDSCH reception opportunities (PDSCH repetitions) is not limited to these. In addition, the order in which the TCI states for PDSCH reception opportunities are applied is not limited to the example shown in the figure.

[0211] Furthermore, in this disclosure, the UE can also cyclically apply multiple TCI states to the PDSCH reception opportunities (this method can also be referred to as the first method or cyclic manner). For example, when R TCI states are set, the first to R TCI states can be applied to the first to R PDSCH reception opportunities respectively. When the number of TCI states (R) is less than the number of reception opportunities, the same TCI states (again 1 to R) can be cyclically applied to the remaining PDSCH reception opportunities.

[0212] Furthermore, in this disclosure, the UE can also apply multiple TCI states sequentially to the PDSCH reception opportunities (this method can also be referred to as the second method or the sequential method). For example, if R TCI states are set for K PDSCH reception opportunities, the r-th (r = 1, ..., R-1) TCI state can be applied to the reception opportunities of [(r-1)K / R+1] to (rK / R), and the R-th TCI state can be applied to the reception opportunities of [(R-1)K / R+1] to K PDSCH.

[0213] Implementation Method 1.1

[0214] The number of TCI states for each TCI code point in the DCI format (e.g., DCI format 1_1) can also be common to the number of TCI states that can be applied in Rel.16. In other words, the UE can also be configured to have the same number of TCI states for each TCI code point in the DCI format (e.g., DCI format 1_1) as the number of TCI states that can be applied in Rel.16, and control transmission and reception.

[0215] In this case, the number of bits in the DCI field associated with the TCI state can also be 3 bits. Furthermore, one or two TCI states can correspond to one TCI code point. Additionally, a maximum of eight TCI states can be activated.

[0216] At this time, the UE can also generate (determine) a set of other TCI states to apply to the PDSCH reception opportunity from other TCI code points that are different from the default TCI state and the TCI state indicated by the network.

[0217] Other TCI code points can also be the m-th (m is an integer greater than 2) smallest (lower) two active TCI states TCI code points. In addition, other TCI code points can also be the m-th smallest active TCI state TCI code point and the (m+1)-th smallest active TCI state TCI code point.

[0218] In addition, in this embodiment, the maximum number of default TCI states corresponding to a TCI code point can be notified to the UE through higher-layer signaling (e.g., RRC signaling), or it can be determined based on UE capability information, or it can be determined based on the actual number of PDSCH reception opportunities (PDSCH repetitions).

[0219] Figure 10 This is a diagram illustrating an example of the TCI states applied during a PDSCH reception opportunity. Figure 10 In the example shown, the TCI code point is 3 bits, and each TCI code point can be set to a maximum of two active TCI states. Figure 10 In this context, TCI#0 and TCI#1, corresponding to TCI code point 000, are TCI states set as the default or indicated from the NW. The UE can also distinguish between these default TCI states and TCI#2 and TCI#3, corresponding to TCI code point 001, as the TCI states to be applied during PDSCH reception. The UE applies TCI states #0-#3 to PDSCH reception opportunities and controls PDSCH reception.

[0220] According to implementation method 1.1, communication control can be simplified and overhead in the UE's DCI reception can be suppressed.

[0221] Implementation Method 1.2

[0222] The number of TCI states for each TCI code point in the DCI format (e.g., DCI format 1_1) can also be greater than the number of TCI states that can be applied in Rel.16. In other words, the UE can also be set to have the same number of TCI states for each TCI code point in the DCI format (e.g., DCI format 1_1) as the number of TCI states that can be applied in Rel.16, and control transmission and reception accordingly.

[0223] In this case, the number of bits in the DCI field associated with the TCI state can also be 3 or more. Furthermore, two or more TCI states can correspond to one TCI code point. Additionally, a maximum of eight or more TCI states can be activated.

[0224] If the default TCI state set to the UE (or the TCI state indicated from the NW) is two TCI states, the UE can also apply these two TCI states to the PDSCH reception opportunity. Alternatively, the "default TCI state set to the UE" in this disclosure can be replaced with a default TCI state determined by the UE based on the TCI state set / activated via RRC / MAC, etc.

[0225] Figure 11 This is a diagram illustrating an example of the TCI states applied during a PDSCH reception opportunity. Figure 11 In this context, TCI#0 and TCI#1, corresponding to TCI code point 000, are either set as the default TCI state or indicated by the NW. At this time, the UE applies TCI states #0 and #1 to the PDSCH reception opportunity and controls the PDSCH reception.

[0226] If the default TCI state set to the UE (or the TCI state indicated from the NW) is more than two TCI states, the UE can also apply these two or more TCI states to the PDSCH reception opportunity.

[0227] Figure 12 This is a diagram illustrating an example of the TCI states applied during a PDSCH reception opportunity. Figure 12 In this context, TCI#0-#3, corresponding to TCI code point 000, are either set as the default TCI state or indicated by the NW. At this time, the UE applies TCI state #0-#3 to the PDSCH reception opportunity and controls the PDSCH reception.

[0228] If the maximum number of default TCI states (or TCI states indicated from NW) set for the UE is greater than the number of PDSCH reception opportunities for the UE, the UE may also select the TCI state index of the number of PDSCH reception opportunities in ascending (or descending) order from the set default TCI states (or TCI states indicated from NW), and apply the TCI state corresponding to the TCI state index to the PDSCH reception opportunities.

[0229] Figure 13 This is a diagram illustrating an example of the TCI states applied during a PDSCH reception opportunity. Figure 13In the TCI code point 000, TCI#0-#3 are TCI states that are set as the default TCI states or indicated from the NW. When the number of PDSCH reception opportunities for the UE is 2, the UE applies TCI states #0 and #1 from TCI states #0-#3 to the PDSCH reception opportunities and controls the reception of PDSCH.

[0230] If the maximum number of default TCI states (or TCI states indicated from the NW) set for the UE is greater than the number of PDSCH reception opportunities for the UE, the UE may also envision that: a number of TCI states with PDSCH reception opportunities or less, corresponding to the TCI code points, are set as the default TCI states (or TCI states indicated from the NW). The UE may then apply this default TCI state (or TCI state indicated from the NW) to the PDSCH reception opportunities.

[0231] Furthermore, if the maximum number of default TCI states (or TCI states indicated from the NW) set for the UE is greater than the number of PDSCH reception opportunities for the UE, the UE may also assume that the TCI states corresponding to the TCI code points, having the same number of TCI states as the number of PDSCH reception opportunities, are set as the default TCI states (or TCI states indicated from the NW). The UE may then apply this default TCI state (or TCI state indicated from the NW) to the PDSCH reception opportunities.

[0232] Figure 14 This is a diagram illustrating an example of the TCI states applied during a PDSCH reception opportunity. Figure 14 In this scenario, when the UE has two PDSCH reception opportunities, TCI#4 and #5 corresponding to TCI code point 001 are set as the default TCI states. The UE applies TCI states #4 and #5 to the PDSCH reception opportunities and controls the reception of PDSCH.

[0233] According to implementation method 1.2, for example, the default TCI state set to the UE can be appropriately applied to the PDSCH reception opportunity, enabling more flexible control over PDSCH reception.

[0234] <Second Implementation>

[0235] The second implementation relates to the default TCI state (QCL) for each reception opportunity used for repeated reception. Figure 15A as well as Figure 15B This is a diagram illustrating an example of the default TCI state that is repeatedly received. Figure 15A as well as Figure 15BThis is equivalent to four repeated DL receptions. Additionally, in the following figures, different shaded lines for TRP, repeated reception / transmission, etc., can also indicate different TCI states (beaming). In this embodiment, new RRC parameters can also be imported to switch and utilize the mechanism of the default TCI state in Rel.16.

[0236] In this disclosure, the TCI status can be explicitly notified to the UE via higher-layer signaling (e.g., RRC signaling / MAC CE), or it can be not notified to the UE. Furthermore, QCL is envisioned to be either explicitly set by the UE or not set by the UE. Additionally, the UE can also envision that the PDSCH and the identified SSB transmitted via the recent PRACH are QCL-compliant.

[0237] The default TCI state can also be the same (or common) across all reception opportunities (Implementation 2.1). In this case, for example, since the same QCL can be applied across multiple time slots in the DMRS, better channel estimation accuracy in the UE can be ensured. Figure 15A The image shows an example of a UE repeatedly receiving data at each reception opportunity under the same TCI state #0.

[0238] The UE can also be envisioned as having the same default TCI state, which can be selected by any of the following:

[0239] • The same rules as Rel.15 (Implementation 2.1.1),

[0240] • Schedule the TCI state / QCL of the DCI (Implementation 2.1.2).

[0241] According to implementation method 2.1.1, the default TCI state can be determined in the same way as conventional rules, so UE installation is easy.

[0242] In implementation 2.1.2, the default TCI state can also be the TCI state corresponding to the TCI state of the CORESET that detected the scheduling DCI.

[0243] According to implementation method 2.1.2, PDSCH reception can be performed based on the beam that has been successfully received, and therefore the success of DL reception can be expected.

[0244] The default TCI state can also differ across reception opportunities (Implementation 2.2). In this case, for example, by using multiple TRPs, better robustness (spatial diversity) for suppressing blocking can be ensured. Figure 15BThe example shown illustrates repeated reception during the first to fourth reception opportunities, based on different TCI states #0-#3 of the UE. In this case, the TCI states for each reception opportunity can also be applied using the methods described in the first embodiment.

[0245] The UE can also be envisioned as having multiple default TCIs for multiple reception opportunities derived through any of the following:

[0246] • TCI status ID / QCLID for each CORESET (Implementation Method 2.2.1)

[0247] • The order of TCI status IDs / QCLIDs indicated by RRC / MAC CE (which can also be interchanged with setting, activation, etc.) (Implementation method 2.2.2),

[0248] • For at least one reception opportunity, the TCI state / QCL is predetermined; for the remaining reception opportunities, the TCI state / QCL is set / activated (Implementation 2.2.3).

[0249] • The order of beam IDs indicated by RRC / MAC CE (Implementation 2.2.4),

[0250] • The order of CORESETs is predetermined or indicated by RRC / MAC CE (Implementation 2.2.5).

[0251] In implementation 2.2.1, multiple default TCI states can also include TCI states corresponding to all set CORESETs. For example, a UE with set CORESETs #0-#2 can also... Figure 15B In the first to fourth receiving opportunities, reception is performed according to the TCI state of CORESET#0, the TCI state of CORESET#1, the TCI state of CORESET#2, and the TCI state of CORESET#0, respectively.

[0252] According to implementation method 2.2.1, even without additional / specific signaling compared to Rel.15, the UE can determine the default TCI state for multiple TRPs, and thus can suppress the increase in communication related to the notification of the default TCI state.

[0253] In implementation 2.2.2, multiple default TCI states can also correspond to an order (sorting) of specific TCI state IDs that are set / activated. This order can also be specified by a list containing multiple indices (also called sorting indices) representing the TCI state corresponding to a particular reception opportunity and a set of TCI state IDs corresponding to that index. Alternatively, the index can be implicitly included in the list. Furthermore, the index can start from 0.

[0254] In addition, the order of these TCI state IDs can also be referred to as a list / set / group / sequence of TCI state IDs (or TCI states).

[0255] Figure 16 This is a diagram illustrating an example of the order of TCI state IDs according to implementation method 2.2.2. In this example, TCI state IDs #0-#3 are associated with indices 1-4, respectively. In this case, the UE can also... Figure 15B In the first to fourth receiving opportunities, reception is performed according to TCI status IDs #0-#3 respectively.

[0256] According to implementation method 2.2.2, the UE can easily determine the default TCI state for multiple TRPs.

[0257] In implementation 2.2.3, the UE may, for example, determine the default TCI state of at least one reception opportunity among multiple default TCI states based on the determination of a default TCI state shown in implementation 2.1 (implementations 2.1.1-2.1.3). Furthermore, the UE may, for example, determine the default TCI state of the remaining reception opportunities based on the determination of multiple default TCI states shown in implementation 2.2.1 or 2.2.2.

[0258] Furthermore, the at least one reception opportunity used in the decision of the default TCI state shown in Implementation 2.1 can be either a repeated initial (i.e., first) reception opportunity or a specific (e.g., last) reception opportunity other than that.

[0259] Figure 17A Figure 17B is a diagram illustrating an example of the default TCI state according to implementation 2.2.3. In this example, it is assumed that the number of repeated receptions is 4.

[0260] Figure 17A Examples are shown of determining the default TCI state for the first reception opportunity based on implementation method 2.1.1, and determining the default TCI state for the second to fourth reception opportunities based on implementation method 2.2.2. The default TCI state for the first reception opportunity is a pre-determined TCI state (e.g., the minimum CORESETID).

[0261] Figure 17B Examples are shown of determining the default TCI state for the first reception opportunity based on implementation method 2.1.2, and determining the default TCI state for the second to fourth reception opportunities based on implementation method 2.2.2. The default TCI state for the first reception opportunity may also be the TCI state that is implicitly notified by the TCI state of the repeatedly received scheduling DCI (e.g., DCI format 1_1).

[0262] According to implementation method 2.2.3, for example, the default TCI state of the initial time slot for repeated reception in multiple time slots becomes a behavior common to the default TCI state of a single time slot (without repetition), which can suppress the complexity of UE control.

[0263] In implementation 2.2.4, multiple default TCI states can also correspond to the order (sorting) of specific beam IDs that are set / activated. This order can also be specified by a list containing multiple indices (also called sorting indices) indicating which beam is which and a set of beam IDs corresponding to that index. Alternatively, the index can be implicitly included in the list. Furthermore, the index can start from 0.

[0264] In addition, the order of the beam IDs can also be referred to as a list / set / group / sequence of beam IDs (or beams).

[0265] The default TCI state for the first receiving opportunity of repeated reception can be either the beam ID corresponding to the starting position (starting index) or the beam ID corresponding to the starting ID.

[0266] The default TCI state for the i-th reception opportunity of repeated reception can be either the beam ID corresponding to the index mod({starting index + i - 2}, number of repeated receptions) + 1, or the beam ID corresponding to the index mod({(starting ID and set index) + i - 2}, number of repeated receptions) + 1. Additionally, mod(X, Y) refers to the remainder when X is divided by Y (modulo operation).

[0267] In the above implementation 2.2.4, the UE may also determine the starting ID or starting position based on at least one of the following:

[0268] • Schedule the TCI state of DCI.

[0269] • Default TCI state / Default QCL assumption

[0270] • Explicit indications based on RRC / MAC / DCI (e.g., notifications of information related to the origin ID),

[0271] • The TCI status of the PL-RS that is set / activated

[0272] • The start time position of reception (e.g., start time slot, start sub-time slot, start frame, start sub-frame, start symbol).

[0273] Furthermore, in the above embodiment 2.2.4, the UE can also be conceived as having the starting ID as a specific beam ID (e.g., the smallest beam ID) in the set / activated / predetermined beam sequence. (This will be discussed later.) Figure 18A In the case of beam ID#1.

[0274] Furthermore, in the above embodiment 2.2.4, the UE may also envision the starting position (starting index) as a specific index (e.g., the smallest index) related to the set / activated / predetermined beam order. (This will be discussed later.) Figure 18A In the case of sorted index 1).

[0275] Figure 18A Figure 18B is an example of the order of beam IDs involved in embodiment 2.2.4. Figure 18A As shown, in this example, beam IDs #1-#4 are associated with indices 1-4 respectively. For example, if the starting ID is determined to be beam ID #1, the UE can also... Figure 15B In the first to fourth receiving opportunities, reception is performed according to beam IDs #1 to #4 respectively.

[0276] Figure 18B It is shown Figure 18A The diagram shows the migration of the order of beam IDs. That is, if the index of a certain receiving opportunity is 4, then the index of the next receiving opportunity becomes 1.

[0277] According to implementation method 2.2.4, the UE can easily determine the default TCI state for multiple TRPs. Furthermore, the UE can flexibly control the allocation of the optimal beam for the first reception opportunity.

[0278] In Embodiment 2.2.5 described above, the beam order of Embodiment 2.2.4, which is replaced by CORESET (or CORESETID) order, can also be utilized. For example, the CORESET start ID (start position) can be determined based on the same parameters as described regarding the start ID in Embodiment 2.2.4.

[0279] Alternatively, the network can set one of the three optimal TCI states for each CORESET. In this case, if the CORESET sequentially contains three CORESETs, the UE can determine the appropriate TCI state to apply based on the aforementioned three optimal TCI states.

[0280] Figure 19 This is a diagram illustrating an example of the order of CORESETs according to Implementation Method 2.2.5. In this example, it is assumed that the order of CORESETs is predetermined as CORESET#0, #1, #2. If the default TCI state of a certain reception opportunity follows the TCI of CORESET#2, the default TCI state of the next reception opportunity may also follow the TCI state of CORESET#0.

[0281] According to implementation method 2.2.5, the UE can easily determine the default TCI state for multiple TRPs. When the CORESET order is predefined, no additional signaling related to the CORESET order is required.

[0282] [Modification of Implementation Method 2.2]

[0283] In the above implementation methods 2.2.1-2.2.5, if the number of multiple default TCI states exported is the same as the number of repeated receptions (the number of DL reception opportunities), a one-to-one mapping is sufficient. However, if this is not the case, a one-to-one mapping is not required.

[0284] When the number of derived default TCI states (beams) is greater than the number of repetitions (the number of DL reception opportunities), the initial N (N being the number of repetitions) IDs, starting from the larger (or smaller) of the IDs corresponding to the default TCI states (CORESETID, TCI state ID, spatial relationship ID, beam ID, etc.), can also be applied to each repetition reception opportunity. For example, in the case of implementation 2.2.1, if the number of CORESETs (e.g., 3) is greater than the number of repetitions (e.g., 2), then the TCI states of the two CORESETIDs (e.g., CORESET#0, #1) can also be applied to the first and second reception opportunities, respectively.

[0285] Additionally, the phrase "starting from the larger (or smaller) one" here can be replaced with "starting from the starting index (or starting ID)" in implementation methods 2.2.4 and 2.2.5, for example.

[0286] When the number of multiple default TCI states (beams) that are derived is less than the number of repeated receptions (the number of DL reception opportunities), the IDs (CORESETID, TCI state ID, spatial relationship ID, beam ID, etc.) corresponding to the default TCI states can also be applied to each repeated reception opportunity based on at least one of the first method (e.g., the cyclic manner) and the second method (e.g., the sequential manner).

[0287] For example, in implementation 2.2.1, if the number of CORESETs (e.g., 2) is less than the number of repetitions (e.g., 4), the TCI states of the two CORESETIDs (e.g., CORESET#0, #1) can also be applied to the first to fourth reception opportunities respectively.

[0288] In the case of the cyclic method, for example, the TCI of CORESET#0, the TCI of CORESET#1, the TCI of CORESET#0, and the TCI of CORESET#1 can be used in the first, second, third, and fourth receiving opportunities, respectively. In the case of the successive method, for example, the TCI of CORESET#0, the TCI of CORESET#0, the TCI of CORESET#1, and the TCI of CORESET#1 can be used in the first, second, third, and fourth receiving opportunities, respectively.

[0289] According to the second implementation described above, the UE can appropriately determine the default TCI state used for repeated reception.

[0290] <Third Implementation Method>

[0291] The third implementation describes whether the second and other implementations are applied based on the UE's capabilities.

[0292] If at least one of the following UE capabilities is reported, at least one of the second and other embodiments may also be applied:

[0293] • Whether different TCI / QCLs can be applied to different receiver opportunities,

[0294] • Whether different TCI states can be applied to the default TCI state / QCL for each receiving opportunity.

[0295] • The number of supported TCI states / QCLs

[0296] • Number of supported CORESETs

[0297] • The number of beam switching opportunities (number of beam switching times) between all repeated reception opportunities for the same data.

[0298] Furthermore, when information related to a certain quantity is reported as a UE capability, at least one of the second implementation and other implementations may be applied if the quantity is above (or below) a specific value.

[0299] According to the third embodiment described above, it is possible to appropriately control the judgment related to the repeatedly received TCI state based on the UE capability.

[0300] <Fourth Implementation>

[0301] The UE can also determine (select) the above N TCI states from the TCI states of each reception opportunity (slot, sub-slot, etc.) during repeated PDSCH based on the measurement results of the beam report (e.g., L1-SINR / L1-RSRP).

[0302] Specifically, the N TCI states applied to repeated receptions can also correspond to the N best beams measured by the UE. For example, the UE can also measure the reference signal received using multiple beams and report to the network a beam report related to the beam with the highest measurement result, such as L1-SINR / L1-RSRP. The base station can also indicate to the UE, based on this report (e.g., the latest reported TCI state (beam)), that it includes the N best TCI states as the TCI states for receiving the PDSCH scheduled to the UE.

[0303] Compared to the case where the UE uses a larger number of beams than the top N beams in repeated reception, if the UE uses the top N beams in repeated reception, then improved communication characteristics are expected.

[0304] Furthermore, if the optimal beam in the timing of repeated reception is known, it is preferable, from a communication characteristics perspective, to use only that beam for repeated reception. However, in reality, there are factors such as blockage containing random elements and environmental changes, making it difficult to know the instantaneous optimal beam at any given moment. Therefore, if the optimal N beams are used for diversity transmission / reception, improved communication reliability can be expected. However, from a diversity perspective, N is assumed to be at most 2 or 4 (because it is difficult to consider two or four beams becoming completely blocked simultaneously). The aforementioned N can be predetermined by specifications, set by the UE through higher-layer signaling / MAC signaling, or it can be the same value as the number of reported beams included in the beam report.

[0305] According to the fourth implementation described above, the UE can appropriately determine the default TCI state used for repeated reception.

[0306] <Other>

[0307] The above-described implementations can be used independently for each channel / signal, or they can be used jointly for multiple channels / signals. For example, the default TCI state of the PDSCH can be determined by different methods for each channel / signal, or by the same method.

[0308] For example, the higher-layer signaling used in this disclosure (e.g., RRC signaling for setting beam order) can be set independently for each channel / signal, or it can be set centrally for multiple channels / signals by a single parameter (in which case the single parameter is applied to the multiple channels / signals).

[0309] For example, higher-level signaling regarding PDSCH (such as PDSCH beam order) can also be configured using at least one of the following:

[0310] • Parameters included in the PDSCH configuration information (PDSCH-Config information element).

[0311] ·Parameters associated with the TCI state of PUSCH

[0312] • The parameters associated with PDSCH resource notifications (PDSCH resources, time domain resource allocation list (PDSCH-TimeDomainResourceAllocationList information element), a field indicating the PUSCH repetition number (e.g., also referred to as the PDSCH repetition number field) indicated by higher-level parameters or DCI, and a portion of the frequency domain resource allocation field indicated by higher-level parameters or DCI).

[0313] • A portion of the parameters associated with the PUCCH resource notification (PUCCH resource (PUCCH-Resource information element), PUCCH resource set (PUCCH-ResourceSet information element), a portion of the PUCCH repetition number field indicated by the notification through higher-level parameters or DCI (e.g., also referred to as the PUCCH repetition number field), a portion of the PUCCH resource indicator field included in the DCI, and a portion of the PUCCH resource indicated by the PUCCH resource indicator field included in the DCI).

[0314] Furthermore, higher-layer signaling for multiple channels / signals can be configured either per UL BWP (e.g., included in the BWP-Uplink information element), per DL BWP (e.g., included in the BWP-Downlink information element), or per cell (e.g., included in the ServingCellConfig information element). Additionally, higher-layer signaling for multiple channels / signals can be configured independently within UL channels / signals and DL channels / signals, or it can be configured commonly.

[0315] Additionally, the DCI (or a field of the DCI) in this disclosure may be replaced with an implicit notification using the DCI. The implicit notification using the DCI may also include at least one of the following: (detected) DCI (or the DCI corresponding to or used in reception), time resources, frequency resources, Control Channel Element (CCE) index, Physical Resource Block (PRB) index, Resource Element (RE) index, search space index, Control Resource Set (CORESET) index, and aggregation level.

[0316] Furthermore, the above-described embodiments can be applied to situations where multiple TRPs or multiple panels (operations) are set on the UE, or to situations where this is not the case. Additionally, the above-described embodiments can be applied to situations where the UE performs URLLC-based operations (or has the capability for URLLC), or to situations where this is not the case.

[0317] (Wireless Communication System)

[0318] The structure of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of this disclosure.

[0319] Figure 20 This is a diagram illustrating an example of the schematic structure of a wireless communication system according to one embodiment. The wireless communication system 1 can also be a system that uses Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) as standardized by the Third Generation Partnership Project (3GPP).

[0320] Furthermore, the wireless communication system 1 can also support dual connectivity between multiple radio access technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC can 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)), etc.

[0321] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0322] Wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (e.g., MN and SN are dual connectivity of NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0323] The wireless communication system 1 may also include a base station 11 forming a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a-12c) configured within the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. The user terminal 20 may also be located within at least one cell. The configuration and number of each cell and the user terminal 20 are not limited to the arrangement shown in the figure. Hereinafter, without distinguishing between base stations 11 and 12, they will be collectively referred to as base station 10.

[0324] User terminal 20 may also connect to at least one of multiple base stations 10. User terminal 20 may also utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0325] Each CC can also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). Macro cell C1 can also be included in FR1, and small cell C2 can also be included in FR2. For example, FR1 can also be a frequency band below 6 GHz (sub-6 GHz), and FR2 can also be a frequency band above 24 GHz (above-24 GHz). Furthermore, the frequency bands and definitions of FR1 and FR2 are not limited to these; for example, FR1 can also be equivalent to a frequency band higher than FR2.

[0326] In addition, user terminal 20 can also use at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) to communicate in each CC.

[0327] Multiple base stations 10 can also be connected via wired (e.g., fiber optic cable based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, base station 11, which is equivalent to a host station, can also be referred to as an Integrated Access Backhaul (IAB) donor, and base station 12, which is equivalent to a relay station, can also be referred to as an IAB node.

[0328] Base station 10 can also be connected to core network 30 via other base stations 10 or directly. Core network 30 may include at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0329] User terminal 20 can also be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0330] In wireless communication system 1, wireless access methods based on Orthogonal Frequency Division Multiplexing (OFDM) can also be used. For example, in at least one of the downlink (DL) and uplink (UL) links, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA) can also be used.

[0331] The wireless access method can also be referred to as a waveform. In addition, in the wireless communication system 1, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be used in the wireless access methods of UL and DL.

[0332] As a downlink channel, the wireless communication system 1 can also use downlink shared channels (Physical Downlink Shared Channel (PDSCH)), broadcast channels (Physical Broadcast Channel (PBCH)), downlink control channels (Physical Downlink Control Channel (PDCCH)) and so on, which are shared among the user terminals 20.

[0333] In addition, as uplink channels, the wireless communication system 1 may also use uplink shared channels (Physical Uplink Shared Channel (PUSCH)), uplink control channels (Physical Uplink Control Channel (PUCCH)), random access channels (Physical Random Access Channel (PRACH)) and so on, which are shared by each user terminal 20.

[0334] User data, high-level control information, and System Information Blocks (SIBs) are transmitted via the PDSCH. User data and high-level control information can also be transmitted via the PUSCH. In addition, the Master Information Block (MIB) can also be transmitted via the PBCH.

[0335] Lower-layer control information can also be transmitted via PDCCH. Lower-layer control information may include, for example, downlink control information (DCI), which includes scheduling information for at least one of PDSCH and PUSCH.

[0336] Additionally, the DCI that schedules PDSCH can also be called DL allocation, DL DCI, etc., and the DCI that schedules PUSCH can also be called UL authorization, UL DCI, etc. Furthermore, PDSCH can also be replaced with DL data, and PUSCH can also be replaced with UL data.

[0337] In PDCCH detection, a Control Resource Set (CORESET) and a search space can be utilized. A CORESET corresponds to the resources used to search for DCIs. The search space corresponds to the search area and search method for PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor CORESETs associated with a specific search space based on search space settings.

[0338] A search space can also correspond to one or more PDCCH candidates that are equivalent to one or more aggregation levels. One or more search spaces can also be referred to as a search space set. In addition, the terms "search space", "search space set", "search space setting", "search space set setting", "CORESET", and "CORESET setting" used in this disclosure can be used interchangeably.

[0339] Uplink control information (UCI) including at least one of Channel State Information (CSI), delivery confirmation information (such as Hybrid Automatic Repeat reQuest ACK knowledgement (HARQ-ACK), ACK / NACK, etc.), and Scheduling Request (SR) can also be transmitted via PUCCH. Random access preambles used for establishing a connection with the cell can also be transmitted via PRACH.

[0340] Furthermore, in this disclosure, downlink, uplink, etc., may be described without the word "link". Additionally, various channels may be described without the word "physical".

[0341] In wireless communication system 1, synchronization signals (SS) and downlink reference signals (DL-RS) can also be transmitted. As DL-RS, wireless communication system 1 can also transmit cell-specific reference signals (CRS), channel state information reference signals (CSI-RS), demodulation reference signals (DMRS), positioning reference signals (PRS), phase tracking reference signals (PTRS), etc.

[0342] Synchronization signals can be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block containing SS (PSS, SSS) and PBCH (and DMRS for PBCH) can also be called an SS / PBCH block, SS block (SSB), etc. Furthermore, SS, SSB, etc., can also be called reference signals.

[0343] Furthermore, in the wireless communication system 1, the uplink reference signal (UL-RS) can also transmit measurement reference signals (sounding reference signals (SRS)) and demodulation reference signals (DMRS). Additionally, the DMRS can also be referred to as a user terminal-specific reference signal (UE-specific reference signal).

[0344] (Base station)

[0345] Figure 21 This diagram illustrates an example of the structure of a base station according to one embodiment. The base station 10 includes a control unit 110, a transmit / receive unit 120, a transmit / receive antenna 130, and a transmission path interface (transmission line interface) 140. Alternatively, the control unit 110, the transmit / receive unit 120, the transmit / receive antenna 130, and the transmission path interface 140 may each be provided in more than one form.

[0346] Furthermore, while this example primarily illustrates the functional blocks of the characteristic portions of this embodiment, it can also be envisioned that the base station 10 also possesses other functional blocks required for wireless communication. Some of the processing of each unit described below may also be omitted.

[0347] The control unit 110 performs overall control of the base station 10. The control unit 110 can be composed of a controller, control circuit, etc., which are described based on common knowledge in the art to which this disclosure pertains.

[0348] The control unit 110 can also control signal generation and scheduling (e.g., resource allocation, mapping). The control unit 110 can also control transmission, reception, and measurement using the transmit / receive unit 120, transmit / receive antenna 130, and 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 transmit / receive unit 120. The control unit 110 can also perform call processing (setting, releasing, etc.) of the communication channel, status management of the base station 10, and management of wireless resources.

[0349] The transmitting / receiving 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 transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting / receiving unit 120 can be composed of transmitters / receivers, RF circuits, baseband circuits, filters, phase shifters, measurement circuits, transmitting / receiving circuits, etc., as described based on common knowledge in the art to which this disclosure pertains.

[0350] The transmitting and receiving unit 120 can be configured as a single integrated transmitting and receiving unit, or it can be composed of a transmitting unit and a receiving unit. The transmitting unit can also be composed of a transmitting processing unit 1211 and an RF unit 122. The receiving unit can also be composed of a receiving processing unit 1212, an RF unit 122, and a measurement unit 123.

[0351] The transmitting and receiving antenna 130 can be constructed from an antenna, such as an array antenna, as described based on common knowledge in the art to which this disclosure pertains.

[0352] The transmitting / receiving unit 120 can also transmit the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 can also receive the aforementioned uplink channel, uplink reference signal, etc.

[0353] The transmitting and receiving unit 120 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc., to form at least one of the transmitting beam and the receiving beam.

[0354] The transmitting and receiving unit 120 (transmitting processing unit 1211) may, for example, perform processing at the Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer (e.g., RLC retransmission control), and Medium Access Control (MAC) layer (e.g., HARQ retransmission control) on the data and control information obtained from the control unit 110, and generate a bit string to be transmitted.

[0355] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform transmission processing such as channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), Discrete Fourier Transform (DFT) processing (as needed), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output the baseband signal.

[0356] The transmitting and receiving unit 120 (RF unit 122) can also perform modulation, filtering, amplification, etc. on the baseband signal to the wireless frequency band, and transmit the wireless frequency band signal through the transmitting and receiving antenna 130.

[0357] On the other hand, the transmitting and receiving unit 120 (RF unit 122) can also amplify, filter, and demodulate the signals of the wireless frequency band received through the transmitting and receiving antenna 130 into the baseband signal.

[0358] The transmitting and receiving unit 120 (receiving and processing unit 1212) can also perform receiving and processing on the acquired baseband signal, including analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data, etc.

[0359] The transmitting / receiving unit 120 (measurement unit 123) can also perform measurements related to the received signal. For example, the measurement unit 123 can also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc., based on the received signal. The measurement unit 123 can also measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (SINR), signal to noise ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 110.

[0360] The transmission path interface 140 can also transmit and receive signals (backhaul signaling) between the device included in the core network 30 and other base stations 10, and can also acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0361] In addition, the transmitting unit and receiving unit of the base station 10 in this disclosure may also be composed of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0362] The transmit / receive unit 120 may also send information to the terminal for determining one or more default TCI states to apply in each reception opportunity of repeated reception on the Physical downlink Shared Channel (PDSCH). The control unit 110 may also control the repeated reception using a spatial domain receive filter based on the one or more default TCI states.

[0363] (User terminal)

[0364] Figure 22This diagram illustrates an example of the structure of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Alternatively, more than one of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be included.

[0365] Furthermore, while this example primarily illustrates the functional blocks of the characteristic portions of this embodiment, it is also conceivable that the user terminal 20 may also have other functional blocks required for wireless communication. Some of the processing of each unit described below may also be omitted.

[0366] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., which are described based on common knowledge in the technical field to which this disclosure pertains.

[0367] The control unit 210 can also control signal generation, mapping, etc. The control unit 210 can also control 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.

[0368] The transmitting / receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting / receiving unit 220 may be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common knowledge in the art to which this disclosure pertains.

[0369] The transmitting and receiving unit 220 can be configured as a single integrated transmitting and receiving unit, or it can be composed of a transmitting unit and a receiving unit. The transmitting unit can also be composed of a transmitting processing unit 2211 and an RF unit 222. The receiving unit can also be composed of a receiving processing unit 2212, an RF unit 222, and a measurement unit 223.

[0370] The transmitting and receiving antenna 230 can be constructed from an antenna, such as an array antenna, as described based on common knowledge in the art to which this disclosure pertains.

[0371] The transmitting / receiving unit 220 can also receive the downlink channel, synchronization signal, downlink reference signal, etc., mentioned above. The transmitting / receiving unit 220 can also transmit the uplink channel, uplink reference signal, etc., mentioned above.

[0372] The transmitting and receiving unit 220 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc., to form at least one of the transmitting beam and the receiving beam.

[0373] The transmitting and receiving unit 220 (transmitting processing unit 2211) may, for example, perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control) on the data and control information obtained from the control unit 210, and generate the bit string to be transmitted.

[0374] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be transmitted, and output the baseband signal.

[0375] Furthermore, whether or not to apply DFT processing can be based on the transform precoding settings. For a certain channel (e.g., PUSCH), if transform precoding is enabled, the transmit / receive unit 220 (transmit processing unit 2211) can perform DFT processing as described above for transmitting the channel using the DFT-s-OFDM waveform. Otherwise, the transmit / receive unit 220 (transmit processing unit 2211) can perform the above transmission processing without performing DFT processing.

[0376] The transmitting and receiving unit 220 (RF unit 222) can also perform modulation, filtering, amplification, etc. on the baseband signal to the wireless frequency band, and transmit the wireless frequency band signal through the transmitting and receiving antenna 230.

[0377] On the other hand, the transmitting and receiving unit 220 (RF unit 222) can also amplify, filter, and demodulate the baseband signal for the wireless frequency band signal received by the transmitting and receiving antenna 230.

[0378] The transmitting and receiving unit 220 (receiving and processing unit 2212) can also perform receiving and processing on the acquired baseband signal, such as analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data.

[0379] The transmitting / receiving unit 220 (measurement unit 223) can also perform measurements related to the received signal. For example, the measurement unit 223 can also perform RRM measurements, CSI measurements, etc., based on the received signal. The measurement unit 223 can also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 210.

[0380] Alternatively, the transmitting and receiving units of the user terminal 20 in this disclosure may also be composed of at least one transmitting / receiving unit 220 and transmitting / receiving antenna 230.

[0381] Control unit 210 can also determine one or more default TCI states to apply during repeated reception opportunities on the Physical Downlink Shared Channel (PDSCH). Transmit / receive unit 220 can also implement the repeated reception using a spatial domain receive filter based on the one or more default TCI states.

[0382] The control unit 210 may also decide that the one or more default TCI states include the Transmission Configuration Indication (TCI) state corresponding to the set Control Resource Set (CORESET).

[0383] The control unit 210 can also make a decision such that the one or more default TCI states correspond to the order of the set or activated TCI state IDs.

[0384] It is also permissible to have more than three different TCI states for a default TCI state corresponding to at least one downlink control information code point.

[0385] (Hardware Structure)

[0386] Furthermore, the block diagrams used in the above description of the embodiments illustrate functional units. These functional blocks (structural units) are implemented through any combination of at least one of hardware and software. Moreover, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented using a single device that is physically or logically combined, or it can be implemented by directly or indirectly (e.g., using wired, wireless, etc.) connecting two or more physically or logically separate devices. A functional block can also be implemented by combining the aforementioned single device or multiple devices with software.

[0387] Here, the functions include judgment, decision, determination, calculation, calculation, processing, export, investigation, search, confirmation, receiving, sending, output, access, resolution, selection, choosing, establishing, comparison, assumption, expectation, regard as, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning, but are not limited to these. For example, a functional block (structural unit) that implements the sending function can also be called a transmitting unit, transmitter, etc. As described above, the implementation method is not particularly limited.

[0388] For example, in one embodiment of this disclosure, the base station, user terminal, etc., can also function as a computer for processing the wireless communication method of this disclosure. Figure 23 This is a diagram illustrating an example of the hardware structure of a base station and a user terminal according to one embodiment. The base station 10 and the user terminal 20 described above can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0389] Furthermore, in this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware structure of base station 10 and user terminal 20 can be configured to include one or more of the apparatuses shown in the figures, or it can be configured not to include any of the apparatuses.

[0390] For example, only one processor 1001 is shown, but there can be multiple processors. Furthermore, processing can be performed by one processor, or simultaneously, sequentially, or by two or more processors using other methods. Additionally, processor 1001 can be implemented using more than one chip.

[0391] The functions of the base station 10 and the user terminal 20 are implemented, for example, by reading specific software (programs) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 can perform calculations and control communication via the communication device 1004, or control at least one of reading out and writing data in the memory 1002 and the storage device 1003.

[0392] The processor 1001, for example, enables the operating system to operate and control the computer as a whole. The processor 1001 may also be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic devices, registers, etc. For example, at least a portion of the control unit 110 (210), the transmit / receive unit 120 (220), etc., described above may also be implemented by the processor 1001.

[0393] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and performs various processes accordingly. As a program, a program that causes the computer to perform at least a portion of the operations described in the above embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001; similar implementations can be made for other functional blocks.

[0394] The memory 1002 may also be a computer-readable recording medium, such as being composed of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage media. The memory 1002 may also be referred to as a register, cache, main memory (main storage device), etc. The memory 1002 is capable of storing executable programs (program code), software modules, etc., for implementing the wireless communication method according to an embodiment of this disclosure.

[0395] Storage device 1003 may also be a computer-readable recording medium, such as comprising at least one of the following: flexible disc, floppy disk, optical disk (e.g., compact disc ROM, CD-ROM, etc.), digital multifunction disk, Blu-ray disc, removable disk, hard disk, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium. Storage device 1003 may also be referred to as an auxiliary storage device.

[0396] The communication device 1004 is hardware (transmitting and receiving device) used for communication between computers via at least one of a wired network and a wireless network. It is also referred to as a network device, network controller, network interface card (NIC), communication module, etc. To implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD), the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the aforementioned transmit / receive unit 120 (220) and transmit / receive antenna 130 (230) may also be implemented by the communication device 1004. The transmit / receive unit 120 (220) may also be implemented by physically or logically separating the transmit unit 120a (220a) and the receive unit 120b (220b).

[0397] Input device 1005 is an input device that receives input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). Output device 1006 is an output device that performs output to external sources (e.g., display, speaker, light-emitting diode (LED) lamp, etc.). Alternatively, input device 1005 and output device 1006 can also be an integrated structure (e.g., touch panel).

[0398] Furthermore, the processor 1001, memory 1002, and other devices are connected via a bus 1007 for communication of information. The bus 1007 can be configured as a single bus or as different buses between the devices.

[0399] Furthermore, the base station 10 and the user terminal 20 can 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), or a field-programmable gate array (FPGA), and can be used to implement part or all of the functional blocks. For example, the processor 1001 can also be implemented using at least one of these hardware components.

[0400] (Modified Example)

[0401] Furthermore, the terms described in this disclosure, as well as those necessary for understanding this disclosure, may be replaced with terms that have the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Additionally, a signal may also be a message. A reference signal may also be abbreviated as RS, and may be referred to as pilot, pilot signal, etc., depending on the applied standard. Furthermore, a component carrier (CC) may also be referred to as cell, frequency carrier, carrier frequency, etc.

[0402] A radio frame can also be composed of one or more periods (frames) in the time domain. Each period (frame) that constitutes the radio frame can also be called a subframe. Furthermore, a subframe can also be composed of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) independent of the parameter set (numerology).

[0403] Here, the parameter set can also refer to communication parameters applied in at least one of the transmission and reception of a signal or channel. For example, the parameter set can also represent at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, and specific windowing processing performed by the transmitter and receiver in the time domain.

[0404] In the time domain, a time slot can also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.). Furthermore, a time slot can also be a time unit based on a set of parameters.

[0405] A time slot can also contain multiple mini-time slots. Each mini-time slot can also consist of one or more symbols in the time domain. Furthermore, a mini-time slot can also be called a sub-time slot. A mini-time slot can also consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-time slot can also be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using mini-time slots can also be called PDSCH (PUSCH) mapping type B.

[0406] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols can also use their respective other names. Furthermore, the time units such as frames, subframes, time slots, mini-time slots, and symbols used in this disclosure can be used interchangeably.

[0407] For example, a subframe can also be called a TTI, multiple consecutive subframes can also be called a TTI, a time slot or a mini-time slot can also be called a TTI. That is, at least one of a subframe and a TTI can be a subframe in existing LTE (1ms), a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. In addition, the unit representing TTI may not be called a subframe, but a time slot, mini-time slot, etc.

[0408] Here, TTI refers, for example, to the smallest unit of time for scheduling in wireless communication. For instance, in an LTE system, the base station schedules radio resources (frequency bandwidth, transmit power, etc., available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0409] TTI can also be a unit of time for transmitting channel-coded data packets (transmission blocks), code blocks, codewords, etc., and can also be a unit of processing such as scheduling and link adaptation. In addition, when a TTI is given, the actual time interval (e.g., the number of symbols) mapped to transmission blocks, code blocks, codewords, etc. can be shorter than the TTI.

[0410] Furthermore, when a time slot or a 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 serve as the minimum time unit for scheduling. In addition, the number of time slots (mini-time slots) constituting the minimum time unit of the schedule can also be controlled.

[0411] A Time Interval (TTI) with a duration 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 a normal TTI can also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub-time slot, a time slot, etc.

[0412] In addition, long TTIs (e.g., normal TTIs, subframes, etc.) can be replaced with TTIs with a duration of more than 1 ms, and short TTIs (e.g., shortened TTIs, etc.) can be replaced with TTIs with a duration of less than long TTIs but more than 1 ms.

[0413] A resource block (RB) is a unit of resource allocation in both the time and frequency domains. In the frequency domain, it can also contain one or more consecutive subcarriers. The number of subcarriers in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers in an RB can also be determined based on the parameter set.

[0414] Furthermore, an RB can contain one or more symbols in the time domain, and can also be a time slot, a mini-time slot, a subframe, or the length of a TTI. A TTI, a subframe, etc., can also be composed of one or more resource blocks.

[0415] In addition, one or more RBs can also be referred to as Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0416] Furthermore, a resource block can also consist of one or more resource elements (REs). For example, an RE can also be a radio resource area consisting of a subcarrier and a symbol.

[0417] The Bandwidth Part (BWP) (also referred to as partial bandwidth, etc.) can also represent a subset of consecutive common resource blocks (RBs) used for a certain parameter set in a carrier. Here, common RBs can also be determined by indexing RBs based on a common reference point of the carrier. PRBs can also be defined in a BWP and appended with numbers within that BWP.

[0418] A BWP can also include a UL BWP (BWP used by UL) and a DL BWP (BWP used by DL). For a UE, one or more BWPs can also be set within a single carrier.

[0419] At least one of the configured BWPs can be active, and the UE may not intend to transmit or receive specific signals / channels outside of the active BWPs. Furthermore, terms such as "cell" and "carrier" in this disclosure can be replaced with "BWP".

[0420] Furthermore, the structures described above, such as radio frames, subframes, time slots, mini-time slots, and symbols, are merely illustrative. For example, the number of subframes contained in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots contained within a time slot, the number of symbols and RBs contained in a time slot or mini-time slot, the number of subcarriers contained in an RB, and the number of symbols in a TTI, symbol length, and cyclic prefix (CP) length can be varied in many ways.

[0421] Furthermore, the information, parameters, etc., described in this disclosure can be represented by absolute values, relative values ​​with respect to a specific value, or other corresponding information. For example, wireless resources can also be indicated by a specific index.

[0422] In this disclosure, the names used for parameters, etc., are not limiting names in any respect. Furthermore, the mathematical expressions, etc., using these parameters may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name; therefore, the various names assigned to these various channels and information elements are not limiting names in any respect.

[0423] The information, signals, etc., described in this disclosure can also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be mentioned throughout the above description, can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0424] Furthermore, information, signals, etc., can be output in at least one of the following directions: from higher level (upper layer) to lower level (lower layer), and from lower layer to higher level. Information, signals, etc., can also be input and output via multiple network nodes.

[0425] Input and output information, signals, etc., can be stored in a specific location (e.g., memory) or managed using a management table. Input and output information, signals, etc., can be overwritten, updated, or appended. Output information, signals, etc., can also be deleted. Input information, signals, etc., can also be sent to other devices.

[0426] The notification of information is not limited to the methods / implementations described in this disclosure, and may also be carried out by other methods. For example, the notification of information in this disclosure may also be implemented through physical layer signaling (e.g., downlink control information (DCI), uplink control information (UCI), etc.), 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 combinations thereof.

[0427] In addition, physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. Furthermore, RRC signaling can also be referred to as RRC messages, such as RRC connection setup messages, RRC connection reconfiguration messages, etc. Additionally, MAC signaling can also be notified using, for example, the MAC control element (CE).

[0428] Furthermore, notification of specific information (e.g., a notification that “is X”) is not limited to explicit notification, but can also be implicit (e.g., by not providing that specific information, or by providing other information).

[0429] The determination can be made by a value represented by a single bit (0 or 1), by a true or false value (boolean), or by a numerical comparison (e.g., a comparison with a specific value).

[0430] Whether software is called software, firmware, middleware, microcode, hardware description language, or any other name, it should be broadly interpreted to refer to instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0431] Furthermore, software, instructions, and information can also be sent and received via a transmission medium. For example, when software is sent 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 within the definition of a transmission medium.

[0432] The terms “system” and “network” as used in this disclosure are used interchangeably. “Network” may also mean devices included in a network (e.g., base stations).

[0433] In this disclosure, the terms "precoding", "precoder", "weight (precoding weight)", "quasi-co-location (QCL)", "transmission configuration indication state (TCI state)", "spatial relation", "spatial domain filter", "transmit power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beamwidth", "beam angle", "antenna", "antenna element", and "panel" are used interchangeably.

[0434] In this disclosure, the terms "Base Station (BS)", "Wireless Base Station", "Fixed Station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "Access Point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "Panel", "Cell", "Sector", "Cell Group", "Carrier", and "Component Carrier" are used interchangeably. There are also instances where the terms macro cell, small cell, femtocell, and picocell are used to refer to a base station.

[0435] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, its coverage area can be divided into several smaller areas, each of which can provide communication services via a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a portion or all of the coverage area of ​​at least one of the base station and base station subsystem providing communication services within that coverage area.

[0436] In this disclosure, the terms “Mobile Station (MS)”, “user terminal”, “user equipment (UE)”, and “terminal” are used interchangeably.

[0437] There are also instances where mobile stations are referred to as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals, handsets, user agents, mobile clients, clients, or several other appropriate terms.

[0438] At least one of the base station and the mobile station can also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Additionally, at least one of the base station and the mobile station can also be a device mounted on a mobile body, the mobile body itself, etc. This mobile body can be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body moving in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanized or unmanned). Furthermore, at least one of the base station and the mobile station also includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station can also be an Internet of Things (IoT) device such as a sensor.

[0439] Furthermore, the base station in this disclosure can also be replaced by a user terminal. For example, various methods / implementations of this disclosure can be applied to a structure where the communication between the base station and the user terminal is replaced by communication between multiple user terminals (e.g., also referred to as device-to-device (D2D) or vehicle-to-everything (V2X)). In this case, it can also be configured such that the user terminal 20 has the functions of the base station 10 described above. In addition, terms such as "uplink" and "downlink" can be replaced with terms corresponding to inter-terminal communication (e.g., "side"). For example, uplink channel, downlink channel, etc., can also be replaced with side channel.

[0440] Similarly, the user terminal in this disclosure can also be replaced by a base station. In this case, it can also be configured such that the base station 10 has the functions of the user terminal 20 described above.

[0441] In this disclosure, actions are assumed to be performed by the base station, and sometimes, depending on the circumstances, by its upper node. Clearly, in a network containing one or more network nodes, including 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 (e.g., considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or combinations thereof.

[0442] The various methods / implementations described in this disclosure can be used individually, in combination, or switched as needed during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of the various methods / implementations described in this disclosure can be rearranged as long as they do not contradict each other. For example, with respect to the method described in this disclosure, the illustrated order is used to indicate various steps, but the order in which they are indicated is not limited.

[0443] The various methods / implementations described in this disclosure can also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New Radio Access (NX), Future generation radio access (FX), Global System for Mobile Communications (GSM (registered trademark))), CDMA2000, Ultra Mobile Broadband (UMB), IEEE This includes IEEE 802.11 (Wi-Fi, registered trademark), IEEE 802.16 (WiMAX, registered trademark), IEEE 802.20, Ultra-Wideband (UWB), Bluetooth (registered trademark), systems utilizing other suitable wireless communication methods, and next-generation systems derived from them. Furthermore, multiple systems can be combined (e.g., LTE or LTE-A, combinations with 5G, etc.) for application.

[0444] As used in this disclosure, the term "based on" does not mean "based on only" unless otherwise specified. In other words, the term "based on" means both "based on only" and "based on at least".

[0445] Any reference to an element using the designations "first," "second," etc., as used in this disclosure does not comprehensively limit the quantity or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, reference to the first and second elements does not imply that only two elements may be used, or that the first element must in some form take precedence over the second element.

[0446] The term "determining" as used in this disclosure can encompass a wide variety of actions. For example, "determining" can also refer to judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), and ascertaining.

[0447] In addition, "judgment (decision)" can also refer to receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, accessing (e.g., accessing data in memory), etc., as situations where "judgment (decision)" is performed.

[0448] Furthermore, "judgment (decision)" can also refer to situations where resolving, selecting, choosing, establishing, or comparing are considered as making a "judgment (decision)". In other words, "judgment (decision)" can also refer to certain actions as situations where a "judgment (decision)" is made.

[0449] In addition, "judgment (decision)" can also be replaced by "assuming", "expecting", "considering", etc.

[0450] As used in this disclosure, the terms "connected," "coupled," or any variations thereof, refer to all direct or indirect connections or combinations between two or more elements, and can include cases where there is one or more intermediate elements between two mutually "connected" or "coupled" elements. The connections or combinations between elements can be physical, logical, or a combination thereof. For example, "connected" can also be replaced with "access."

[0451] In this disclosure, when two elements are connected, it is possible to use more than one wire, cable, printed electrical connection, etc., and to use electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region as several non-limiting and non-exclusive examples, so that they are "connected" or "combined" with each other.

[0452] In this disclosure, the term "A is different from B" can also mean "A and B are different from each other." Additionally, the term can also mean "A and B are each different from C." Terms such as "separate" and "combined" can also be interpreted in the same way as "different."

[0453] When the terms "include," "including," and variations thereof are used in this disclosure, these terms, like the term "comprising," mean inclusive. Furthermore, the term "or" as used in this disclosure does not mean XOR.

[0454] In this disclosure, for example, in cases where articles are added through translation, such as a, an, and the in English, the disclosure may also include cases where the noun following these articles is in a plural form.

[0455] The invention disclosed herein has been described in detail above. However, it will be apparent to those skilled in the art that the invention is not limited to the embodiments described herein. The invention can be implemented with modifications and variations without departing from the spirit and scope of the invention as defined by the claims. Therefore, the description in this disclosure is for illustrative purposes only and is not intended to limit the invention in any way.

Claims

1. A terminal, comprising: The transmitting unit transmits capability information; The receiving unit receives the DCI of the PDSCH scheduling, wherein the DCI represents multiple TCI states; as well as The control unit, when higher-layer parameters are set to the terminal and the scheduling offset of the DCI for the PDSCH is less than a threshold, determines the maximum number of default TCI states corresponding to the TCI code points based on the capability information. The default TCI states are used for receiving the PDSCH.

2. The terminal as described in claim 1, wherein, The higher-level parameters are commonly set for multiple channels.

3. A wireless communication method for a terminal, comprising: The steps for sending capability information; The steps of receiving the DCI of the PDSCH scheduling, wherein the DCI represents multiple TCI states; and The step of determining the maximum number of default TCI states corresponding to TCI code points based on the capability information when the higher-layer parameters are set to the terminal and the scheduling offset of the DCI for the PDSCH is less than a threshold, wherein the default TCI states are used for receiving the PDSCH.

4. A system comprising the terminal as described in claim 1 or claim 2 and a base station.

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