Terminal, wireless communication method and base station

Abstract

A terminal according to one embodiment of the present disclosure includes: a receiving unit, in which data is multicast at a plurality of timings set by high-layer signaling, and receives the data at at least one timing of the plurality of timings; and a control unit, which decodes the data. According to one embodiment of the present disclosure, multicast downlink data can be appropriately received.

Description

Technical Field

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

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

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

[0004] Prior art literature

[0005] Non-patent literature

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

[0007] Problems to be solved by the invention

[0008] In future wireless communication systems (eg, NR), it is envisioned that a plurality of user terminals (user terminals, User Equipment (UE)) communicate in an ultra-high density and high traffic environment.

[0009] In NR, a situation is envisioned where, in such an environment, multiple UEs receive downlink data using multicast.

[0010] However, in the NR specifications to date, the reception of multicast downlink data by UE has not been fully studied. If the reception of downlink data using multicast is not performed properly, there is a concern that system performance may be reduced, such as a decrease in throughput.

[0011] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately receive multicast downlink data.

[0012] Means for solving problems

[0013] A terminal according to one aspect of the present disclosure includes: a receiving unit that receives data in at least one of a plurality of timings multicasted at a plurality of timings set by higher layer signaling; and a control unit that decodes the data.

[0014] Effects of the Invention

[0015] According to one aspect of the present disclosure, multicast downlink data can be appropriately received. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram showing an example of the configuration of multicast PDSCH resources.

[0017] Figure 2 This is a diagram showing another example of the configuration of multicast PDSCH resources.

[0018] Figure 3 This is a diagram showing an example of a reception indication based on DCI.

[0019] Figure 4 This is a diagram showing an example of a non-reception indication based on DCI.

[0020] Figure 5 This is a diagram showing an example of DCI including N reception indications.

[0021] Figure 6 This is a diagram showing an example of instructions based on the presence or absence of a specific signal.

[0022] Fig. 7A as well as Figure 7BThis is a diagram showing an example of indication based on DMRS.

[0023] Fig. 8A as well as Figure 8B This is a diagram showing an example of instructions based on determination resources.

[0024] Fig. 9 This is a diagram showing an example of instructions based on a plurality of determination resources.

[0025] Fig. 10A as well as Fig. 10B This is a diagram showing an example of the application timing of the instruction.

[0026] Fig.11A as well as Fig. 11B This is a diagram showing an example of instructions based on instruction timing.

[0027] Fig.12 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0028] Fig.13 This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0029] Fig.14 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0030] Fig.15 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION

[0031] (TCI, spatial relationship, QCL)

[0032] In NR, research is being conducted to control the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and coding) of at least one of a signal and a channel (expressed as signal / channel) in the UE based on the transmission configuration indication state (Transmission Configuration Indication state (TCI state)).

[0033] The TCI state may also represent the state of a signal / channel applied to a downlink. A state equivalent to the TCI state of a signal / channel applied to an uplink may also be expressed as a spatial relation.

[0034] The TCI state is information related to Quasi-Co-Location (QCL) of signals / channels, and may also be referred to as spatial reception parameters, spatial relationship information, etc. The TCI state may be set for each channel or each signal to the UE.

[0035] In addition, in the present disclosure, the TCI state of DL, the spatial relationship of UL, and the TCI state of UL can also be replaced with each other.

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

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

[0038] Regarding QCL, multiple types (QCL types) may also be specified. For example, four QCL types AD may also be set, in which the parameters (or parameter sets) that can be assumed to be the same are different, and the parameters (which may also be referred to as QCL parameters) are expressed as follows:

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

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

[0041] QCL Type C (QCL-C): Doppler shift and average delay,

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

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

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

[0045] The TCI state may be, for example, information related to the QCL between the channel being the object (in other words, the reference signal (RS) used for the channel) and other signals (for example, other RS). The TCI state may also be set (indicated) by high-layer signaling, physical layer signaling, or a combination thereof.

[0046] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0047] MAC signaling may also use, for example, MAC Control Element (MAC CE), MAC Protocol Data Unit (MAC Protocol Data Unit (PDU)), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), Other System Information (Other System Information (OSI)), etc.

[0048] The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI))).

[0049] The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0050] In addition, the RS that is in a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SynchronizationSignal Block (SSB)), a channel state information reference signal (CSI-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called QRS).

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

[0052] The UE may also receive setting information of a list of information elements containing TCI states through higher-layer signaling (eg, PDSCH-Config, tci-StatesToAddModList).

[0053] The information element of the TCI state set by high-level signaling ("TCI-state IE" of RRC) may also include a TCI state ID and one or more QCL information ("QCL-Info"). The QCL information may also include at least one of information related to the RS that forms a QCL relationship (RS relationship information) and information indicating the QCL type (QCL type information). The RS relationship information may also include information such as the index of the RS (for example, SSB index, non-zero power CSI-RS (Non-Zero-Power (NZP) CSI-RS) resource ID (identifier (Identifier))), the index of the cell where the RS is located, and the index of the bandwidth part (Bandwidth Part (BWP)) where the RS is located.

[0054] 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 to the UE.

[0055] When TRS is set as RS of QCL type A, it is assumed that TRS is different from the demodulation reference signal (DMRS) of PDCCH or PDSCH, and the same TRS is periodically transmitted for a long time. UE can measure TRS and calculate average delay, delay spread, etc.

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

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

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

[0059] <TCI status for PDCCH>

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

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

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

[0063] <TCI status for PDSCH>

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

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

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

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

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

[0069] When the UE sets TCI existence information to "valid (enabled)" for the CORESET that schedules PDSCH (the CORESET used in the PDCCH transmission that schedules PDSCH), the UE may also assume that the TCI field exists in the DCI format 1_1 of the PDCCH sent on the CORESET.

[0070] When TCI existence information is not set for the CORESET that schedules the PDSCH, or when the PDSCH is scheduled through DCI format 1_0, when the time offset between the reception of DL DCI (DCI that schedules the PDSCH) and the reception of the PDSCH corresponding to the DCI is greater than 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.

[0071] When TCI presence information is set to "enabled", when the TCI field in the DCI in the component carrier (CC) of the scheduling (PDSCH) indicates the activated TCI state in the scheduled CC or DL ​​BWP and the PDSCH is scheduled by DCI format 1_1, in order to determine the QCL of the PDSCH antenna port, the UE may also use the TCI that follows the value of the TCI field in the PDCCH with DCI and detected. When the time offset between the reception of the DL DCI (scheduling the PDSCH) and the PDSCH corresponding to the DCI (the PDSCH scheduled by the DCI) is greater than a threshold, the UE may also assume that the DM-RS port of the PDSCH of the serving cell and the RS in the TCI state associated with the QCL type parameter provided by the indicated TCI state are QCL.

[0072] In the case where the UE is configured with a single time slot PDSCH, the indicated TCI state may also be based on the activated TCI state in the time slot with the scheduled PDSCH. In the case where the UE is configured with multiple time slot PDSCHs, the indicated TCI state may also be based on the activated TCI state in the initial time slot with the scheduled PDSCH, and the UE may also expect that the TCI state indicated across the time slots with the scheduled PDSCH is the same. In the case where the UE is configured with a CORESET associated with a search space set for cross-carrier scheduling, the UE sets the TCI existence information to "valid" for the CORESET, and at least one of the TCI states set for the service cell scheduled by the search space set includes QCL type D. The UE may also assume that the time offset between the detected PDCCH and the PDSCH corresponding to the PDCCH is greater than the threshold.

[0073] In RRC connection mode, in both the case where TCI information in DCI (high-layer parameter TCI-PresentInDCI) is set to "valid (enabled)" and the case where TCI information in DCI is not set, when the time offset between the reception of DL DCI (DCI that schedules PDSCH) and the corresponding PDSCH (PDSCH scheduled by the DCI) is less than a threshold (application condition, first condition), the UE may also assume that the DM-RS port of the PDSCH of the serving cell is QCL with the following RS, which is an RS associated with the QCL parameter used in the QCL indication of the PDCCH of the CORESET with the smallest (lowest) CORESET-ID in the latest time slot monitored by the UE for one or more CORESETs in the activated BWP of the serving cell and associated with the monitored search space. This RS may also be referred to as the default TCI state of the PDSCH or the default QCL assumption of the PDSCH.

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

[0075] In addition, the above-mentioned threshold may also be referred to as the time length for QCL (duration (time duration)), "timeDurationForQCL", "threshold (Threshold)", "threshold for offset between a DCI indicating a TCIstate and a PDSCH scheduled by the DCI" (Threshold for offset between a DCI indicating a TCIstate and a PDSCH scheduled by the DCI)", "Threshold-Sched-Offset", scheduling (schedule) offset threshold, scheduling (scheduling) offset threshold, etc.

[0076] The QCL time length may also be based on UE capabilities, for example, based on the delay required for decoding of the PDCCH and beam switching. The QCL time length may also be the minimum time required by the UE for PDCCH reception and application of spatial QCL information received in the DCI for PDSCH processing. The QCL time length may be expressed as a number of symbols per subcarrier interval or as a time (e.g., μs). The information on the QCL time length may be reported from the UE to the base station as UE capability information or may be set from the base station to the UE using high-layer signaling.

[0077] For example, the UE may also assume that the DMRS port of the PDSCH is QCL with the DL-RS, which is a DL-RS in a TCI state activated for the CORESET corresponding to the minimum CORESET-ID. The latest time slot may also be a time slot for receiving the DCI for scheduling the PDSCH.

[0078] Alternatively, CORESET-ID may be an ID (an ID for identifying CORESET, controlResourceSetId) set by the RRC information element "ControlResourceSet".

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

[0080] After Rel.16, when the PDSCH and the PDCCH that schedules it are located in different component carriers (CC) (cross-carrier scheduling), when the delay from PDCCH to PDSCH (PDCCH-to-PDSCH delay) is shorter than the time length for QCL or when there is no TCI state in the DCI used for the scheduling, the UE can also obtain the QCL assumption for the scheduled PDSCH with the activated TCI state with the lowest ID from the PDSCH in the activated BWP that can be applied to the scheduled cell.

[0081] (NR multicast / broadcast)

[0082] In NR up to Rel.16, the transmission of at least one of the signal and channel (hereinafter referred to as signal / channel) from the NW to the UE is basically unicast transmission. In this case, it is assumed that each UE uses multiple reception opportunities (reception opportunities) corresponding to multiple beams (or panels) of the NW to receive the same downlink (DL) data signal / channel (for example, downlink shared channel (PDSCH)) sent from the NW to multiple UEs.

[0083] In addition, it is assumed that in an ultra-high density and high traffic situation such as an environment where multiple UEs are geographically dense (for example, a stadium, etc.), multiple UEs simultaneously receive and receive the same signal / channel. In such a case, multiple UEs exist in the same area, and each UE receives the same signal / channel through unicast, which can ensure the reliability of communication, but is considered to reduce resource utilization efficiency.

[0084] In order to enable UE to receive multicast / broadcast services, group scheduling structures are being studied.

[0085] For example, scheduling of multicast PDSCH by one or more DCIs is under study. In this case, there is a concern that the size (payload size, overhead) of the DCI will increase.

[0086] Therefore, the inventors of the present invention have conceived a method of suppressing the size of DCI used for scheduling multicast PDSCH.

[0087] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the embodiments may be applied individually or in combination.

[0088] (Wireless Communication Method)

[0089] In the present disclosure, "A / B", "at least one of A and B" may also be replaced with each other. In the present disclosure, cell, CC, carrier, BWP, activated DL BWP, activated UL BWP, and band may also be replaced with each other. In the present disclosure, index, ID, indicator, and resource ID may also be replaced with each other. In the present disclosure, RRC parameters, high-layer parameters, RRC information elements (IEs), and RRC messages may also be replaced with each other.

[0090] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0091] MAC signaling may also use, for example, MAC Control Element (MAC CE), MAC Protocol Data Unit (MAC Protocol Data Unit (PDU)), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), Other System Information (Other System Information (OSI)), etc.

[0092] The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI))).

[0093] In the present disclosure, multicast and broadcast may be used interchangeably. In addition, PDSCH for multicast, PDSCH common to multiple UEs, common PDSCH, shared PDSCH, multicast PDSCH, and broadcast PDSCH may be used interchangeably.

[0094] In the present disclosure, DL data, codeword (CW), transport block (TB), and PDSCH may also be replaced with each other.

[0095] In the present disclosure, beam, TCI state, QCL assumption, QCL parameter, spatial domain reception filter, UE spatial domain reception filter, UE reception beam, DL reception beam, DL precoding, DL precoder, DL-RS, RS of QCL type D assumed by TCI state or QCL, RS of QCL type A assumed by TCI state or QCL may also be replaced with each other. In the present disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type X, source of DL-RS, SSB, CSI-RS may also be replaced with each other.

[0096] In the present disclosure, X and Y are quasi co-located (QCLed) with Y, X and Y are quasi co-located with 'QCL-TypeD', X and Y are quasi co-located with respect to 'QCL-TypeD', and X and Y are QCL type D may be interchangeable. X and Y may also be RS or RS resources.

[0097] In the present disclosure, multicast PDSCH, broadcast information (cell information), and paging channel can also be replaced with each other. For example, in the NR Earthquake and Tsunami Warning System (ETWS), when DCI is detected in the dedicated search space (paging search space), the UE obtains the information of the emergency earthquake warning by reading the broadcast information (paging information).

[0098] In the present disclosure, indications of reception / non-reception, DCI, specific signals, and RS may also be used interchangeably.

[0099] In the present disclosure, PDSCH, PDSCH resource, reception timing, timing, and DL data may also be interchangeable.

[0100] The multicast PDSCH may also carry DL data for multiple UEs. Each of the multiple reception opportunities in the multicast PDSCH may carry the same DL data or different data.

[0101] Appropriate beams (optimal beams) may be different in multiple UEs. Multiple reception opportunities may be associated with multiple QCL parameters (e.g., beam, QCL assumption, TCI state), respectively. DL data in each reception opportunity may also be sent (received) using the corresponding QCL parameters.

[0102] One DL data may be a codeword (CW) or a transport block (TB). The same DL data may have the same size (eg, a transport block size (TBS)) or different sizes.

[0103] It is also conceivable that the base station does not use multiple beams to send DL data simultaneously.

[0104] The multiple reception timings that are multicast may also be one PDSCH. Each of the multiple reception timings that are multicast may also be one PDSCH.

[0105] <First embodiment>

[0106] The resources of the multicast PDSCH (resources for multicast PDSCH) may be allocated (semi-statically) through higher layer signaling (for example, RRC information element (IE)).

[0107] The DL data may be multicasted in a plurality of timings (eg, PDSCH) set by higher layer signaling. The UE may receive the DL data in at least one of the plurality of timings and decode the DL data.

[0108] The RRC information element may also indicate at least one of time domain resources, frequency domain resources and transmission period for the multicast PDSCH.

[0109] The time domain resources may also be represented by at least one of a starting position (number of time slots / symbols) and a size (length, number of time slots / symbols). The frequency domain resources may also be represented by at least one of a starting position (number of PRBs / subcarriers) and a size (bandwidth, number of PRBs / subcarriers).

[0110] Multiple PDSCHs may also have the same transmission period (equally spaced). Figure 1 In the example of , the intervals between adjacent PDSCHs are the same, and this interval is set as the transmission period.

[0111] The time domain resources can also be represented by the time offset (number of time slots / symbols) within the transmission period. The transmission period can also be a radio frame. Figure 2 In the example, the transmission period (time domain resource) is set as a time slot number (time slot #0, #1, #2, #5) within a wireless frame.

[0112] The UE may also receive a signal (an indication of reception / non-reception, DCI, a specific signal) and determine the at least one timing (eg, PDSCH) based on the signal.

[0113] When multicast PDSCH resources are configured through higher layer signaling and multicast PDSCH is scheduled (when measurement / reception of multicast PDSCH is instructed, when receiving a reception instruction of multicast PDSCH), the UE may receive the instructed PDSCH or not receive the PDSCH that is not instructed. The reception instruction may also be DCI.

[0114] exist Figure 3In the example, resources of PDSCH1 to 4 are set by high-layer signaling. DCI1 indicates reception of PDSCH2 (is an indication of reception of PDSCH2). UE receives PDSCH2 based on DCI1. DCI2 indicates reception of PDSCH4 (is an indication of reception of PDSCH4). UE receives PDSCH4 based on DCI2. UE does not receive PDSCH1 and 3 that are not indicated.

[0115] When the UE is configured with multicast PDSCH resources through higher layer signaling and does not receive a non-reception indication for the multicast PDSCH, the UE may receive the multicast PDSCH. When receiving a non-reception indication for the multicast PDSCH, the UE may not receive the multicast PDSCH. The non-reception indication may also be DCI.

[0116] exist Figure 4 In the example, resources of PDSCH1 to 4 are set by high-layer signaling. DCI1 indicates non-reception of PDSCH2 (is an indication of non-reception of PDSCH2). The UE does not receive PDSCH2 based on DCI1. DCI2 indicates non-reception of PDSCH4 (is an indication of non-reception of PDSCH4). The UE does not receive PDSCH4 based on DCI2. The UE receives PDSCH1 and 3 that are not indicated.

[0117] One DCI may also indicate N receptions / non-receptions. The value of N may be set by high-level signaling, may be specified by specifications, may be reported from the UE by UE capability information, or may be indicated by a DCI indicating reception / non-reception. Thus, the DCI overhead may be suppressed.

[0118] exist Figure 5 In the example of , resources of PDSCH1 to 4 are set by higher layer signaling. DCI1 indicates reception of PDSCH2 and 3 (is an indication of reception of PDSCH2 and 3). UE receives PDSCH2 and 3 based on DCI1. UE does not receive PDSCH1 and 4 which are not indicated.

[0119] The indication of reception / non-reception may also be a signal from the NW (eg, RS) instead of DCI.

[0120] According to the above first embodiment, it is possible to suppress the DCI overhead.

[0121] <Second embodiment>

[0122] The indication of reception / non-reception may also follow any one of the following indication methods 1 to 3.

[0123] 《Instruction Method 1》

[0124] The indication of reception / non-reception is notified through DCI.

[0125] The indication of reception / non-reception may be a conventional DCI format (DCI format specified in the specifications up to Rel.16).

[0126] In at least one of a case where multicast / broadcast is configured through higher layer signaling and a case where a DCI having a cyclic redundancy check (CRC) encrypted with a radio network temporaly identifier (RNTI) for multicast / broadcast is detected, specific fields of the existing DCI format may also be replaced with parameters for multicast / broadcast.

[0127] The specific field may also include a bit indicating reception or non-reception. The remaining bits in the specific field may also indicate the aforementioned N.

[0128] In the existing DCI format, when the first field is a specific value, a second field different from the first field may also be used to indicate reception / non-reception. The specific value may also be a value that is invalid (invalid, inapplicable) in Rel16 (unicast). The first field and the specific value may also be a field and a specific value used in the verification of activation / deactivation of semi-persistent transmission (DL semi-persistent scheduling (SPS)) or type 2 setting permission (configured grant), etc.).

[0129] The existing DCI format may be a DCI format for an interruption (interruption, preemption) (for example, DCI format 2_1). The RNTI used for CRC scrambling of the existing DCI format may be INT-RNTI.

[0130] The indication of reception / non-reception may be a new DCI format (a DCI format not specified in the specifications up to Rel.16).

[0131] The size of the new DCI format may also be different from the size of the existing DCI format. The size of the new DCI format may also be smaller than the size of the existing DCI format.

[0132] The DCI for indication of reception / non-reception may also include a specific field for indication of reception / non-reception.

[0133] The specific field may include one or more bits indicating a reception indication or a non-reception indication.

[0134] The specific field may also be m bits including any one of the non-reception indication and the reception indication. For example, when m is 2, the specific field may also indicate any one of the non-reception indication, the reception indication (N=1), the reception indication (N=2), and the reception indication (N=3). N may also be indicated by a field different from the specific field.

[0135] The DCI for indicating reception / non-reception (DCI for indicating reception / non-reception) may include a field for indicating explicit reception / non-reception. The UE may determine whether reception / non-reception is indicated by detecting the DCI for indicating reception / non-reception.

[0136] DCI format 1_0 with CRC scrambled by C-RNTI includes a frequency domain resource assignment (FDRA) field, a time domain resource assignment (TDRA) field, a virtual resource block (VRB)-to-physical resource block (PRB) mapping field, a new data indicator (NDI) field, a redundancy version (RV) field, a HARQ process number (HPN) field, a downlink allocation index (DAI) field, a transmit power control (TPC) command field for scheduled PUCCH, a PUCCH resource indicator field, and a PDSCH-to-HARQ feedback timing indicator field.

[0137] When the multicast PDSCH resource is set by high-layer signaling, at least one of the FDRA field, the TDRA field, and the VRB-to-PRB mapping field may be omitted in the DCI for reception / non-reception indication. When multiple candidates for multicast PDSCH resources are set by high-layer signaling, the size of at least one of the FDRA field, the TDRA field, and the VRB-to-PRB mapping field may be reduced in the DCI for reception / non-reception indication.

[0138] The DCI for reception / non-reception indication may also include at least one of the NDI field, the RV field, the HPN field, the DAI field, and the PDSCH-to-HARQ feedback timing indicator field. If at least one of the NDI field, the RV field, the HPN field, the DAI field, and the PDSCH-to-HARQ feedback timing indicator field is not used in the multicast PDSCH, the DCI for reception / non-reception indication may not include the field.

[0139] In the case where the UE may send HARQ-ACK information for the multicast PDSCH in the PUCCH, the DCI for reception / non-reception indication may also include at least one of the TPC command field for PUCCH and the PUCCH resource indicator field. In the case where the UE may not send HARQ-ACK information for the multicast PDSCH in the PUCCH, the DCI for reception / non-reception indication may not include at least one of the TPC command field for PUCCH and the PUCCH resource indicator field.

[0140] 《Instructions 2》

[0141] The indication of reception / non-reception is notified through a specific signal, which may also be RS.

[0142] The information related to the indication of reception / non-reception can be notified by whether a specific signal is sent or by the resources of the specific signal (specific signal resources). For example, the specific signal resource can be a sequence used in a specific signal (for example, a reference sequence number / cyclic shift index) or the received power of a specific signal (for example, energy per resource element (EPRE) or the ratio of the EPRE of a specific signal to the EPRE of other signals). Other signals may also be reference signals such as SSB, secondary synchronization signal (SSS), CSI-RS, DMRS, etc.

[0143] In the case where multicast / broadcast is set by high-layer signaling and a specific signal resource for reception / non-reception indication is set, the UE may also monitor / measure the set specific signal resource. In the case where a specific signal is detected in a specific signal resource, or a specific signal with a specific sequence is detected in a specific signal resource, or the received power of the specific signal (EPRE, the ratio of the received power of the specific signal to the received power of other signals) is higher than a threshold, the UE may also assume that it has been notified of the reception or non-reception indication of the multicast / broadcast PDSCH.

[0144] exist Figure 6 In the example, resources of PDSCH1 to 4 are set by high-level signaling. Resources 1 to 4 for specific signals of PDSCH1 to 4 are set by high-level signaling respectively. The UE detects specific signals in resources 2 and 4. The UE receives PDSCH2 corresponding to resource 2 in which the specific signal is detected, and receives PDSCH4 corresponding to resource 4 in which the specific signal is detected. The UE does not receive PDSCH1 corresponding to resource 1 in which the specific signal is detected, and does not receive PDSCH3 corresponding to resource 3 in which the specific signal is detected.

[0145] The reception / non-reception indication resource may be notified to the UE through higher layer signaling / physical layer control information. The reception / non-reception indication resource may be set as a UE-specific resource or may be set as a common resource between multiple UEs.

[0146] The reception / non-reception indication resource may be notified by at least one of the following parameters 1 to 5.

[0147] [Parameter 1]

[0148] Time resources. Time resources may also be represented by at least one of a start timing, an end timing, and a size (length).

[0149] [Parameter 2]

[0150] Measurement period: The measurement period can be expressed in time slots or ms, or can be expressed in the same parameters as search space / CORESET.

[0151] [Parameter 3]

[0152] Frequency resources. Frequency resources may also be represented by at least one of a start frequency, an end frequency, a size (bandwidth), and a comb index. Frequency resources may also be represented by a bitmap.

[0153] [Parameter 4]

[0154] The transmitted signal sequence may also be represented by at least one of a reference sequence number and a cyclic shift index.

[0155] [Parameter 5]

[0156] Transmit / receive power. Transmit / receive power can also be represented by EPRE. Transmit / receive power can also be represented by the ratio of EPRE of a specific signal to EPRE of other signals.

[0157] Multiple candidates for specific signal resources (parameters) may also be allocated. Multiple candidates for the sequence may also be associated with multiple values ​​of information related to the indication of reception / non-reception, respectively. The information related to the indication of reception / non-reception may also be at least one of N, the time / frequency / symbol resources of the multicast / broadcast PDSCH, and the number of MIMO layers (number of DMRS ports).

[0158] For example, the multiple candidates for the specific signal resource may be multiple candidates for the reference sequence number / cyclic shift index of the sequence of the specific signal, or may be multiple levels (ranges) of the received power of the specific signal.

[0159] The UE may also derive information related to the indication of reception / non-reception based on the DMRS of the multicast PDSCH (the information related to the indication of reception / non-reception may also be implicitly indicated). The specific signal may also be the DMRS of the multicast PDSCH.

[0160] exist Fig. 7A as well as Figure 7B In the example, the DMRS for the multicast PDSCH is set to comb2. Fig. 7A In the example, comb index 0 is associated with value 0 of information related to the indication of reception / non-reception. Figure 7B In the example, comb index 1 is associated with value 1 of information related to the indication of reception / non-reception.

[0161] The UE starts receiving the PDSCH before receiving the indication of reception / non-reception. Regardless of whether there is an indication of reception / non-reception of the PDSCH, the UE buffers the received signal (stores the received signal in a memory). The UE can also determine whether to demodulate / decode the buffered PDSCH based on whether there is an indication of reception / non-reception.

[0162] The UE can also derive information related to the reception / non-reception indication based on part of the resources of the multicast PDSCH (part of the resources of the OFDM codeword of the data, the judgment resources, the specific signal resources) (the information related to the reception / non-reception indication can also be implicitly notified).

[0163] The determination resource may be allocated for UE-specific use and set through higher layer signaling. The UE may determine whether there is a reception / non-reception indication based on whether a specific signal is detected in the determination resource.

[0164] exist Fig. 8A as well as Figure 8B In the example of , a part of the multicast PDSCH resources are set as the decision resources. Fig. 8AIn the example of the determination resource, the specific signal is not transmitted. In the case where the specific signal is not detected in the determination resource, the UE determines that the indication of reception / non-reception does not exist. Figure 8B In the example of the determination resource, a specific signal is transmitted. When the specific signal is detected in the determination resource, the UE determines that an indication of reception / non-reception exists.

[0165] The specific signal may also be a sequence, a pseudo-random (pseudo noise (PN)) sequence, a complex code element carried by a decision resource, or the like.

[0166] The decision resource may also be reserved (or may not be mapped with data).

[0167] When no specific signal is transmitted, the PDSCH may be truncated in the decision resource (PDSCH may not be rate matched around the decision resource). When the specific signal is a reception indication, the UE can decode the PDSCH even if the UE erroneously detects the specific signal in the decision resource.

[0168] When the specific signal is not transmitted, the PDSCH may be rate matched around the decision resource. When the specific signal is a non-reception indication, the UE does not decode the PDSCH even if the UE erroneously detects the specific signal in the decision resource.

[0169] A plurality of decision resources may be allocated to each of a plurality of UEs. In this case, all decision resources are set for the UE. The PDSCH is rate matched around all decision resources.

[0170] exist Fig. 9 In the example of , the UE decodes the PDSCH that is rate matched around decision resources 1 to 4.

[0171] The UE may also determine the reception / non-reception indication sent to it based on the detection result of the specific signal in the judgment resource corresponding to itself. For example, when it is determined that resource 2 corresponds to itself, the UE may also determine whether to receive the multicast PDSCH based on the detection result of the specific signal in the judgment resource 2.

[0172] The determination resource may also be a resource that is not mapped to DMRS by comb configuration (a resource that is mapped to DMRS in comb configuration that is not configured for DMRS). Fig. 7A The comb index = 0, but it is not used Figure 7B When comb index = 1, it is mapped Figure 7BThe resource elements (REs) of the DMRS in the DMRS cannot be used. The determined resources may also be these REs.

[0173] 《Instruction Method 3》

[0174] The reception / non-reception indication is notified by multicasting specific information in the PDSCH.

[0175] The specific information may also be a specific field.

[0176] The location of the specific field may be specified by the specification or may be set by higher layer signaling. The specific field may also be a field in the MAC CE carried by the multicast PDSCH.

[0177] The UE may also demodulate / decode the multicast PDSCH and determine whether the decoded specific field is a reception / non-reception indication sent to itself. If the specific field is a reception indication sent to itself (if the specific field is not a non-reception indication sent to itself), the UE may also obtain the decoding result (or send the decoding result to the upper layer). If the specific field is not a reception indication sent to itself (if the specific field is a non-reception indication sent to itself), the UE may also discard the decoding result.

[0178] The multicast PDSCH may also include multiple specific fields. The multiple specific fields may also correspond to multiple UEs respectively. The UE may also refer to the specific field corresponding to itself among the multiple specific fields in the multicast PDSCH.

[0179] The specific information may also be a UE ID list. The UE ID may also be a specific type of RNTI (eg, C-RNTI).

[0180] The UE ID list may also indicate UEs (receiving UEs, destination UEs) receiving the multicast PDSCH.

[0181] The UE may also demodulate / decode the multicast PDSCH and determine whether the decoded UE ID list contains its own UE ID. If the UE ID list contains its own UE ID, the UE may also obtain the decoding result (or send the decoding result to the upper layer). If the UE ID list does not contain its own UE ID, the UE may also discard the decoding result.

[0182] The UE ID list may also indicate UEs that do not receive the multicast PDSCH (non-receiving UEs).

[0183] The UE may also demodulate / decode the multicast PDSCH and determine whether the decoded UE ID list contains its own UE ID. If the UE ID list does not contain its own UE ID, the UE may also obtain the decoding result (or send the decoding result to the upper layer). If the UE ID list contains its own UE ID, the UE may also discard the decoding result.

[0184] According to the second embodiment described above, the UE can appropriately determine whether to receive the multicast PDSCH.

[0185] <Third Embodiment>

[0186] Whether the reception / non-reception indication is applied to the multicast PDSCH may be determined based on the temporal relationship between the reception / non-reception indication and the multicast PDSCH.

[0187] The indication of reception / non-reception may also be applied to a PDSCH that satisfies an application condition. The application condition may also be application condition 1 or 2.

[0188] [Application Condition 1]

[0189] like Fig. 10A As shown in the example of , the indication of reception / non-reception can also be applied to the PDSCH with the start timing after the time point (application timing) after the specific time with the indication. The specific time can also be expressed as K codewords / K time slots / Kms.

[0190] When K is small, a buffer capacity is required to store the PDSCH, but the UE can quickly determine the indication of reception / non-reception.

[0191] [Application Condition 2]

[0192] like Fig. 10B As shown in the example of , the indication of reception / non-reception may also be applied to the PDSCH of the start timing after the time point (application timing) before the specific time with the indication. The specific time may also be expressed as K'symbol / K'slot / K'ms.

[0193] When K is small, the buffer capacity for storing the PDSCH can be suppressed.

[0194] In the application condition, the end timing of the PDSCH may be used instead of the start timing of the PDSCH.

[0195] The UE may not assume the reception of a PDSCH that does not satisfy the application condition (and may not receive a PDSCH that does not satisfy the application condition).

[0196] The indication of reception / non-reception based on the indication method 2 of the second embodiment can also be applied to a PDSCH that does not satisfy the application condition.

[0197] The value representing the specific time (K or K') may be specified by the specification, set by higher layer signaling, or reported by the UE through UE capability information.

[0198] According to the third embodiment described above, the UE can appropriately determine the PDSCH to which the reception / non-reception indication is applied.

[0199] <Fourth embodiment>

[0200] Based on the resource of the indication of reception / non-reception (indication resource), the multicast PDSCH to which the indication is applied may be determined.

[0201] The indication resource may be the timing of indicating reception / non-reception (indication timing). The multicast PDSCH to which the indication is applied may also follow the following determination method 1 or 2.

[0202] [Decision method 1]

[0203] The indication of reception / non-reception can indicate the next PDSCH (reception timing) of the indication timing ( Fig.11A ), or it can indicate the next PDSCH (receiving opportunity) after a specific time indicated by the timing.

[0204] [Decision method 2]

[0205] The indication of reception / non-reception can indicate the pth PDSCH (reception timing) from the indication timing ( Fig. 11B ), or it may indicate the pth PDSCH (receiving timing) starting from a specific time after the indicated timing.

[0206] The specific time can also be expressed as K symbols / K slots / K ms.

[0207] At least one of p and K may be set through higher layer signaling or may be indicated through a reception / non-reception indication.

[0208] For at least one of p and K, multiple values ​​may be set by higher layer signaling or may be specified by a specification. One of the multiple values ​​may also be indicated by a reception / non-reception indication.

[0209] The UE may receive the PDSCH indicated by the reception / non-reception instruction. Similar to N in the first embodiment, the UE may receive N PDSCHs starting with the PDSCH indicated by the reception / non-reception instruction.

[0210] According to the fourth embodiment described above, it is possible to appropriately determine the PDSCH to be received based on the resource indicating reception / non-reception.

[0211] (Wireless Communication System)

[0212] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0213] Fig.12 1 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), and the like.

[0214] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0215] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0216] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0217] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as base stations 10.

[0218] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0219] Each CC may 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)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also be equivalent to a frequency band higher than FR2.

[0220] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0221] Multiple base stations 10 may also be connected via wired (e.g., optical fiber based on 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, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station (relay) may also be referred to as an IAB node.

[0222] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0223] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0224] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. may be used.

[0225] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the radio access schemes for UL and DL.

[0226] As downlink channels, the wireless communication system 1 may use a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc.

[0227] In addition, as uplink channels, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (Physical Random Access Channel (PRACH)) and the like can also be used in the wireless communication system 1.

[0228] User data, high-layer control information, system information block (SIB), etc. are transmitted through PDSCH. User data, high-layer control information, etc. can also be transmitted through PUSCH. In addition, master information block (MIB) can also be transmitted through PBCH.

[0229] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0230] In addition, the DCI for scheduling the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be replaced by DL data, and the PUSCH may also be replaced by UL data.

[0231] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0232] A search space may also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be interchangeable.

[0233] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also known as hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) can also be transmitted through PUCCH. The random access preamble used to establish a connection with a cell can also be transmitted through PRACH.

[0234] In the present disclosure, downlink, uplink, etc. may be expressed without the word “link.” In addition, various channels may be expressed without the word “physical” at the beginning.

[0235] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. can also be transmitted. As DL-RS, in the wireless communication system 1, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. can also be transmitted.

[0236] The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as SS / PBCH block, SS block (SSB), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0237] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0238] (Base Station)

[0239] Fig.131 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0240] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0241] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0242] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0243] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0244] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0245] The transmitting / receiving antenna 130 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0246] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0247] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0248] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0249] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (Discrete Fourier Transform (DFT)) processing (as needed), inverse fast Fourier transform (Inverse Fast Fourier Transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0250] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0251] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0252] The sending and receiving unit 120 (receiving processing unit 1212) can also apply 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 the acquired baseband signal to obtain user data, etc.

[0253] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (Received Signal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0254] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0255] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0256] The control unit 110 may also control the multicast of data in a plurality of timings set by higher layer signaling. The transmitting and receiving unit 120 may also transmit an indication of at least one timing of the plurality of timings.

[0257] (User Terminal)

[0258] Fig.14 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. In addition, the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may each be provided with one or more.

[0259] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0260] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0261] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0262] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0263] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0264] The transmitting / receiving antenna 230 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0265] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0266] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0267] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0268] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also 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 sent, and output a baseband signal.

[0269] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is valid (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0270] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0271] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0272] The sending and receiving unit 220 (receiving processing unit 2212) can also apply 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 the obtained baseband signal to obtain user data, etc.

[0273] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0274] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0275] The data may be multicasted in a plurality of timings set by higher layer signaling, and the transmitting and receiving unit 220 may receive the data in at least one timing of the plurality of timings. The control unit 210 may also decode the data.

[0276] The transmitting and receiving unit 220 may also receive a signal. The control unit 210 may also determine the at least one timing based on the signal.

[0277] The signal may also indicate any one of the at least one timing among the plurality of timings (for example, a reception indication) and a timing that is not received (for example, a non-reception indication).

[0278] The signal may also be sent in resources (eg, specific signal resources, decision resources) within the resources of a physical downlink shared channel that carries the data.

[0279] (Hardware Structure)

[0280] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0281] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0282] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig.15 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0283] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. can be used interchangeably. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of the devices shown in the figure, or to exclude some of the devices.

[0284] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0285] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0286] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0287] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that causes a computer to perform at least a part of the operations described in the above-mentioned 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, and the same can be implemented for other functional blocks.

[0288] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0289] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray (Blu-ray) (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other suitable storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0290] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) may also be realized by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0291] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0292] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0293] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0294] (Variation Example)

[0295] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0296] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0297] Here, the parameter set may also refer to a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of the subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, wireless frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, specific windowing processing performed by the transmitter and receiver in the time domain, etc.

[0298] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0299] A time slot may also include multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0300] 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 may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be interchangeable.

[0301] For example, a subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and a time slot or a mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0302] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0303] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0304] In addition, when a time slot or a mini time slot is called TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) can also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can also be controlled.

[0305] A TTI having a time length of 1 ms may 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 may 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.

[0306] In addition, a long TTI (e.g., normal TTI, subframe, etc.) may be replaced by a TTI having a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) may be replaced by a TTI having a TTI length shorter than that of the long TTI and longer than 1 ms.

[0307] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0308] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0309] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0310] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0311] Bandwidth Part (BWP) (also referred to as partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, common RBs may also be identified by the index of the RB relative to the common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0312] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0313] At least one of the configured BWPs may be activated, and the UE may not assume that it transmits or receives a specific signal / channel other than the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced by "BWP".

[0314] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0315] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0316] In the present disclosure, the names used for parameters, etc. are not limiting in all respects. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not limiting in all respects.

[0317] Information, signals, etc. described in this disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0318] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0319] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0320] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB)), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof.

[0321] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0322] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0323] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0324] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0325] In addition, software, instructions, information, etc. may 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 technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0326] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0327] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0328] In the present disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro-micro cell, and micro-micro cell.

[0329] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0330] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0331] There are also cases where a mobile station is referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client or some other appropriate terminology.

[0332] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device carried in a mobile body, a mobile body, etc. The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous driving vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0333] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0334] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0335] In the present disclosure, the actions are assumed to be performed by the base station, and sometimes by its upper node (uppernode) depending on the situation. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, considering the Mobility Management Entity (MME)), the Serving-Gateway (S-GW), etc., but not limited to these) or a combination thereof.

[0336] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, sequences, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0337] The various modes / implementations described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER3G, 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 (Ultra Mobile Broadband (UMB)), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems expanded based on them. In addition, multiple systems can also be applied in combination (for example, LTE or LTE-A, combination with 5G, etc.).

[0338] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0339] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used or that the first element must take precedence over the second element in some form.

[0340] The term "determining" used in this disclosure may include a variety of actions. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database or other data structure), ascertaining, etc. are considered to be "determining".

[0341] In addition, "judgment (decision)" may also be a situation where receiving (for example, receiving information), sending (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0342] In addition, "judgment (decision)" can also be regarded as a situation where resolving, selecting, choosing, establishing, comparing, etc. are regarded as a situation where "judgment (decision)" is performed. That is, "judgment (decision)" can also be regarded as a situation where some actions are regarded as a situation where "judgment (decision)" is performed.

[0343] In addition, “judgment (decision)” can also be replaced by “assuming (assuming)”, “expecting (expecting)”, “considering (considering)” and so on.

[0344] The terms "connected", "coupled", or all their variations used in this disclosure refer to all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may also be replaced by "access".

[0345] In the present disclosure, when two elements are connected, it is possible to consider being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0346] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same way as "different".

[0347] When the terms “include,” “including,” and variations thereof are used in the present disclosure, these terms have an inclusive meaning, similar to the term “comprising.” Furthermore, the term “or” used in the present disclosure does not have an exclusive OR meaning.

[0348] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0349] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: A receiving unit receives, through high-layer signaling, a setting of a transmission period between a plurality of time domain resources of a downlink shared channel PDSCH for multicast; and A control unit determines, based on downlink control information DCI, whether to receive the PDSCH in one or more time domains after the DCI in the multiple time domains, The DCI includes a first field and a second field, In a case where the first field indicates a specific value for activation or deactivation of downlink semi-persistent scheduling or configuration grant, the second field indicates whether the PDSCH is received in the one or more time domains.

2. The terminal according to claim 1, wherein: The DCI is transmitted along with a cyclic redundancy check CRC scrambled by a radio network temporary identifier RNTI for multicast.

3. A wireless communication method of a terminal, comprising: The step of receiving, through higher layer signaling, a setting indicating a transmission period between a plurality of time domain resources of a downlink shared channel PDSCH for multicast; and The control unit determines, based on downlink control information DCI, whether to receive the PDSCH in one or more time domains after the DCI in the multiple time domains. The DCI includes a first field and a second field, In a case where the first field indicates a specific value for activation or deactivation of downlink semi-persistent scheduling or configuration grant, the second field indicates whether the PDSCH is received in the one or more time domains.

4. A base station, comprising: a transmitting unit, which transmits, through high-layer signaling, a setting of a transmission period between a plurality of time domain resources of a downlink shared channel PDSCH for multicast; and a control unit, controlling the transmission of downlink control information DCI, wherein the DCI indicates whether to enable the terminal to receive the PDSCH in one or more time domains after the DCI in the multiple time domains, The DCI includes a first field and a second field, In a case where the first field indicates a specific value for activation or deactivation of downlink semi-persistent scheduling or configuration grant, the second field indicates whether the PDSCH is received in the one or more time domains.

5. A system having a terminal and a base station, wherein: The terminal has: A receiving unit receives, through high-layer signaling, a setting of a transmission period between a plurality of time domain resources of a downlink shared channel PDSCH for multicast; as well as A control unit determines, based on downlink control information DCI, whether to receive the PDSCH in one or more time domains after the DCI in the multiple time domains, The base station sends the setting, The DCI includes a first field and a second field, In a case where the first field indicates a specific value for activation or deactivation of downlink semi-persistent scheduling or configuration grant, the second field indicates whether the PDSCH is received in the one or more time domains.

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