Terminal, wireless communication method, and base station

Abstract

A terminal according to an aspect of the present disclosure includes: a control unit that determines one or more default spatial relationships to be applied in each transmission opportunity of repeated transmission on an uplink control channel (Physical Uplink Control Channel (PUCCH)); and a transmission unit that performs the repeated transmission using a spatial domain transmission filter based on the one or more default spatial relationships. According to an aspect of the present disclosure, repeated UL transmission can be appropriately controlled.

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

[0003] Research is also underway on a successor system to LTE (for example, also referred to as the 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.).

[0004] Prior Art Documents

[0005] Non-Patent Documents

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

[0007] Problems to be Solved by the Invention

[0008] In 3GPP Rel.15, retransmission is supported in the UL data channel (e.g., the uplink shared channel (Physical Uplink Shared Channel (PUSCH))). The UE performs control to transmit the PUSCH across multiple time slots (e.g., consecutive K time slots) based on the retransmission factor K set from the network (e.g., the base station). That is, in the case of performing retransmission, each PUSCH is transmitted in a different time slot (e.g., in time slot units).

[0009] On the other hand, after Rel.16, research is being conducted on performing multiple PUSCH transmissions within one time slot in the case of performing PUSCH retransmission. That is, each PUSCH is transmitted in a unit shorter than the time slot (e.g., sub - time slot unit, mini - time slot unit).

[0010] In addition, in NR, research is being conducted on communication using one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi - TRP).

[0011] However, in the NR specifications to date, there has been insufficient research on how to control the UE's retransmission in the UL when multiple panels / TRPs are utilized. For example, the spatial relationship applied by the UE to the retransmission is not clear. There are concerns about a decrease in throughput or deterioration of communication quality if the retransmission for multi - TRP is not properly performed.

[0012] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station capable of appropriately controlling retransmission in the UL.

[0013] Means for Solving the Problem

[0014] A terminal according to one aspect of the present disclosure includes: a control unit that determines one or more default spatial relationships to be applied in each transmission opportunity of the retransmission of the uplink control channel (Physical Uplink Control Channel (PUCCH)); and a transmission unit that performs the retransmission using a spatial domain transmission filter based on the one or more default spatial relationships.

[0015] Advantageous Effects of the Invention

[0016] According to one aspect of the present disclosure, retransmission in the UL can be appropriately controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a diagram showing an example of the repeated transmission of PUSCH in multiple TRPs.

[0018] Figure 2A And Figure 2B This is a diagram showing an example of the default spatial relationship of repeated transmission.

[0019] Figure 3 This is a diagram showing an example of the order of the spatial relationship ID related to Embodiment 1.2.2.

[0020] Figure 4A And Figure 4B This is a diagram showing an example of the default spatial relationship related to Embodiment 1.2.3.

[0021] Figure 5A And Figure 5B This is a diagram showing an example of the order of the beam ID related to Embodiment 1.2.4.

[0022] Figure 6 This is a diagram showing an example of the order of the CORESET related to Embodiment 1.2.5.

[0023] Figure 7A And Figure 7B This is a diagram showing an example of the spatial relationship of each transmission opportunity of PUCCH / PUSCH for transmitting HARQ-ACK related to the third embodiment.

[0024] Figure 8A And Figure 8B This is a diagram showing an example of the spatial relationship of each transmission opportunity of PUCCH / PUSCH for transmitting HARQ-ACK related to the third embodiment.

[0025] Figure 9 This is a diagram showing an example of the schematic structure of a wireless communication system related to an embodiment.

[0026] Figure 10 This is a diagram showing an example of the structure of a base station related to an embodiment.

[0027] Figure 11 This is a diagram showing an example of the structure of a user terminal related to an embodiment.

[0028] Figure 12 This is a diagram showing an example of the hardware structure of a base station and a user terminal related to an embodiment. Detailed implementation mode

[0029] (Repeated transmission)

[0030] In Rel.15, retransmission is supported in data transmission. For example, a base station (network (NW), gNB) can also retransmit DL data (e.g., downlink shared channel (PDSCH)) by an amount corresponding to a specific number of times. Alternatively, a UE can also retransmit UL data (e.g., uplink shared channel (PUSCH)) by an amount corresponding to a specific number of times.

[0031] A UE can also be scheduled for a specific number of repeated PUSCH transmissions by a single DCI. This number of repetitions is also referred to as the repetition factor K or the aggregation factor K.

[0032] In addition, the nth retransmission can also be referred to as the nth transmission opportunity (transmission occasion), etc., and can also be identified by the repetition index k (0 ≤ k ≤ K - 1). Retransmission can be applied to both PUSCHs (e.g., dynamically scheduled PUSCHs based on dynamic grants) and PUSCHs based on configured grants.

[0033] A UE semi-statically receives information indicating the repetition factor K (e.g., aggregationFactorUL or aggregationFactorDL) via higher layer signaling. Here, the higher layer signaling can be, for example, any one of RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information, etc., or a combination thereof.

[0034] MAC signaling can use, for example, MAC control elements (MAC CEs (Control Elements)), MAC PDUs (Protocol Data Units), etc. Broadcast information can be, for example, the Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), etc.

[0035] The UE controls the reception processing (e.g., at least one of reception, demapping, demodulation, decoding) of the PDSCH or the transmission processing (e.g., at least one of transmission, mapping, modulation, encoding) of the PUSCH based on at least one of the following field values (or the information represented by the field values) in the DCI:

[0036] ·Allocation of time-domain resources (e.g., starting symbol, number of symbols within each time slot, etc.),

[0037] ·Allocation of frequency-domain resources (e.g., a specific number of resource blocks (RB: Resource Block), a specific number of resource block groups (RBG: Resource Block Group)),

[0038] ·Modulation and coding scheme (MCS: Modulation and Coding Scheme) index,

[0039] ·Structure (configuration) of the demodulation reference signal (DMRS) for the PUSCH,

[0040] ·Spatial relation information of the PUSCH, or the state (TCI state (TCI-state)) of the transmission configuration indication (TCI: Transmission Configuration Indication) or transmission configuration indicator (Transmission Configuration Indicator).

[0041] The same symbol allocation can also be applied among the consecutive K time slots. The UE can also determine the symbol allocation in each time slot based on the starting symbol S and the number of symbols L (e.g., Start and Length Indicator (SLIV)) determined according to the value m of a specific field (e.g., time-domain resource allocation (TDRA) field) in the DCI. Additionally, the UE can determine the first time slot based on the K2 information determined according to the value m of a specific field (e.g., TDRA field) of the DCI.

[0042] On the other hand, between the consecutive K time slots, the redundancy versions (RVs) of the transport blocks (TBs) applied to the same data can be either the same or at least partially different. For example, the RV applied to the TB in the nth time slot (transmission opportunity, repetition) can also be determined based on the value of a specific field (e.g., RV field) in the DCI.

[0043] In Rel.15, the PUSCH can be repeatedly transmitted across multiple time slots (in time slot units). After Rel.16, the repeated transmission of the PUSCH is supported in units shorter than a time slot (e.g., sub - time slot unit, mini - time slot unit, or specific number of symbol units).

[0044] The UE can also determine the symbol allocation for the PUSCH transmission (e.g., the PUSCH with k = 0) in a specific time slot based on the starting symbol S and the number of symbols L determined according to the value m of a specific field (e.g., TDRA field) in the DCI of the PUSCH. In addition, the UE can also determine a specific time slot based on the Ks information determined according to the value m of a specific field (e.g., TDRA field) of the DCI.

[0045] The UE can also dynamically receive information indicating the repetition factor K (e.g., numberofrepetitions) through downlink control information. The repetition factor can also be determined based on the value m of a specific field (e.g., TDRA field) in the DCI. For example, a table defining the correspondence between the bit values notified through the DCI, the repetition factor K, the starting symbol S, and the number of symbols L can also be supported.

[0046] The repeated transmission based on time slots can also be referred to as repetition type A (e.g., PUSCH repetition type A), and the repeated transmission based on sub - time slots can also be referred to as repetition type B (e.g., PUSCH repetition type B).

[0047] The UE can also be configured to apply at least one of repetition type A and repetition type B. For example, the repetition type applied by the UE can also be notified to the UE from the base station through higher - layer signaling (e.g., PUSCHRepTypeIndicator).

[0048] Either repetition type A or repetition type B can also be configured for the UE for each DCI format scheduling the PUSCH.

[0049] For example, regarding the first DCI format (e.g., DCI format 0_1), when the high-layer signaling (e.g., PUSCHRepTypeIndicator-AorDCIFormat0_1) is set to the retransmission type B (e.g., PUSCH-RepTypeB), the UE applies the retransmission type B to the PUSCH retransmission scheduled by the first DCI format. In other cases (e.g., the case where PUSCH-RepTypeB is not set or the case where PUSCH-RepTypA is set), the UE applies the retransmission type A to the PUSCH retransmission scheduled by the first DCI format.

[0050] (Spatial relation for SRS, PUSCH)

[0051] In Rel.15 NR, the UE can also receive information (SRS configuration information, e.g., parameters in the "SRS-Config" of the RRC control element) used in the transmission of the measurement reference signal (e.g., the sounding reference signal (SRS)).

[0052] Specifically, the UE can also receive at least one of the information related to one or more SRS resource sets (SRS resource set information, e.g., "SRS-ResourceSet" of the RRC control element) and the information related to one or more SRS resources (SRS resource information, e.g., "RS-Resource" of the RRC control element).

[0053] One SRS resource set can also be associated with a specific number of SRS resources (a specific number of SRS resources can also be grouped). Each SRS resource can also be determined by the SRS resource identifier (SRS Resource Indicator (SRI)), or the SRS resource ID (identifier).

[0054] The SRS resource set information can also include the SRS resource set ID (SRS-ResourceSetId), the list of SRS resource IDs (SRS-ResourceId) used in this resource set, the SRS resource type (e.g., any one of periodic SRS, semi-persistent SRS, aperiodic CSI), and the information on the usage of the SRS.

[0055] Here, the SRS resource type can also represent any one of Periodic SRS (P-SRS), Semi-Persistent SRS (SP-SRS), and Aperiodic SRS (A-SRS). Additionally, the UE can also send P-SRS and SP-SRS periodically (or periodically after activation), and send A-SRS based on the SRS request of DCI.

[0056] In addition, the usage (the "usage" of the RRC parameter, the "SRS-SetUse" of the L1 (Layer-1) parameter) can also be, for example, beam management, codebook (CB), non-codebook (NCB), antenna switching, etc. The SRS for codebook or non-codebook usage can also be used for the determination of the precoder for codebook- or non-codebook-based PUSCH transmission based on the SRI.

[0057] For example, in the case of codebook-based transmission, the UE can also determine the precoder for PUSCH transmission based on the SRI, the Transmitted Rank Indicator (TRI), and the Transmitted Precoding Matrix Indicator (TPMI). In the case of non-codebook-based transmission, the UE can also determine the precoder for PUSCH transmission based on the SRI.

[0058] The SRS resource information can also include the SRS-ResourceId, the number of SRS ports, the SRS port number, the transmission Comb, the SRS resource mapping (e.g., the time and / or frequency resource location, the resource offset, the period of the resource, the number of repetitions, the number of SRS symbols, the SRS bandwidth, etc.), the hopping association information, the SRS resource type, the sequence ID, the spatial relationship information of the SRS, etc.

[0059] The spatial relation information of the SRS (e.g., "spatialRelationInfo" of the RRC information element) can also represent the spatial relation information between a specific reference signal and the SRS. The specific reference signal can also be at least one of a synchronization signal / broadcast channel (synchronization signal / physical broadcast channel (Synchronization Signal / Physical Broadcast Channel (SS / PBCH))) block, a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and an SRS (e.g., another SRS). The SS / PBCH block can also be referred to as a synchronization signal block (SSB).

[0060] The spatial relation information of the SRS can also include at least one of an SSB index, a CSI-RS resource ID, and an SRS resource ID as an index of the above-mentioned specific reference signal.

[0061] In addition, in the present disclosure, the SSB index, the SSB resource ID, and the SSB resource indicator (SSB Resource Indicator (SSBRI)) can also be replaced with each other. In addition, the CSI-RS index, the CSI-RS resource ID, and the CSI-RS resource indicator (CSI-RS Resource Indicator (CRI)) can also be replaced with each other. In addition, the SRS index, the SRS resource ID, and the SRI can also be replaced with each other.

[0062] The spatial relation information of the SRS can also include a serving cell index, a bandwidth part (Bandwidth Part (BWP)) index (BWP ID), etc. corresponding to the above-mentioned specific reference signal.

[0063] When the UE is configured with spatial relation information related to an SSB or CSI-RS and an SRS for a certain SRS resource, the UE can also use the same spatial domain filter (spatial domain transmit filter) as the spatial domain filter (spatial domain receive filter) used for the reception of the SSB or CSI-RS to transmit the SRS resource. In this case, the UE can also be considered that the UE receive beam of the SSB or CSI-RS is the same as the UE transmit beam of the SRS.

[0064] When the UE is configured with spatial relation information related to a certain SRS (target SRS) resource, other SRSs (reference SRSs), and the SRS (target SRS), it can also use the same spatial domain filter (spatial domain transmission filter) as the one used for transmitting the reference SRS to transmit the target SRS resource. That is, in this case, the UE can also be considered that the UE transmission beam of the reference SRS is the same as that of the target SRS.

[0065] The UE can also determine the spatial relation of the PUSCH scheduled by the DCI based on the value of a specific field (e.g., SRS resource identifier (SRI) field) in the DCI (e.g., DCI format 0_1). Specifically, the UE can also use the spatial relation information (e.g., "spatialRelationInfo" of the RRC information element) of the SRS resource determined based on the value of the specific field (e.g., SRI) for PUSCH transmission.

[0066] In the case of using codebook-based transmission for PUSCH, the UE can also be configured with two SRS resources for an SRS resource set through RRC and be indicated one of the two SRS resources through DCI (1-bit SRI field). In the case of using non-codebook-based transmission for PUSCH, the UE can also be configured with four SRS resources for an SRS resource set through RRC and be indicated one of the four SRS resources through DCI (2-bit SRI field).

[0067] In NR after Rel.16, research is being conducted on explicitly notifying a common beam for both DL and UL. For example, the TCI state can also be used as (or instead of) the spatial relation information for PUSCH. The TCI state can also correspond to at least one of the downlink TCI state (DL TCI state), the uplink TCI state (UL TCI state), and the unified TCI state.

[0068] In addition, the UL TCI state can also be replaced with spatial relation information (spatialrelationinfo). The unified TCI state can also mean the TCI state that is commonly used in both DL and UL.

[0069] As an index of a reference RS (reference RS) for spatial relation, in addition to an SSB index, a CSI-RS ID, and an SRS ID, a TCI state ID, a control resource set (CORESET) ID, etc. can also be set. For a UE that has a TCI state ID or a CORESET ID set as a spatial relation, when performing UL transmission based on this spatial relation, it can also be assumed that the same spatial domain filter as that used in DL reception following this TCI state ID or the TCI state ID corresponding to this CORESET ID is used in this UL transmission.

[0070] (Path loss RS)

[0071] Path loss PL in the transmission power control of the uplink shared channel (Physical Uplink Shared Channel (PUSCH)), the uplink control channel (Physical Uplink Control Channel (PUCCH)), and the reference signal for measurement (Sounding Reference Signal (SRS)) b，f，c (q d ) [dB] is the index q of the reference signal (RS, Pathloss Reference RS) for the downlink BWP associated with the active UL BWP b of the carrier f of the serving cell c used by the UE d and is calculated.

[0072] In the present disclosure, the path loss reference RS, pathloss (PL)-RS, index q d , the RS used in path loss calculation, and the RS resource used in path loss calculation can also be mutually replaced. In the present disclosure, calculate, estimate, measure, track (track) can also be mutually replaced.

[0073] The PL-RS can also be at least one of DL RSs such as SSB and CSI-RS.

[0074] For accurate path loss measurement for transmission power control, the UE of Rel.15 is set with up to four PL-RSs through RRC signaling. Even when the UL transmission beam (spatial relation) is updated by MAC CE, the PL-RS cannot be updated by MAC CE.

[0075] UEs in Rel.16 are configured with up to 64 PL-RSs by RRC signaling and one PL-RS is indicated (activated) by MAC CE. The UE needs to track (track) up to four activated PL-RSs for all UL channels (SRS, PUCCH, and PUSCH). Tracking the PL-RS can also be calculating the path loss based on the PL-RS measurement and maintaining (storing) the path loss.

[0076] In the case where the TCI state for PDCCH or PDSCH is updated by MAC CE, the PL-RS can also be updated to that TCI state.

[0077] (Default spatial relation and default PL-RS)

[0078] In Rel.15 NR, each MAC CE for activation / deactivation of the PUCCH spatial relation and each MAC CE for activation / deactivation of the SRS spatial relation are required. The PUSCH spatial relation follows the SRS spatial relation.

[0079] In Rel.16 NR, at least one of the MAC CE for activation / deactivation of the PUCCH spatial relation and the MAC CE for activation / deactivation of the SRS spatial relation may not be used.

[0080] The default spatial relation is being studied as the spatial relation utilized by the UE when the spatial relation cannot be utilized (e.g., cannot be determined, specified, or activated) for UL transmission. In addition, the default PL-RS is being studied as the PL-RS utilized when the PL-RS cannot be utilized (as above) for UL transmission or when the default spatial relation cannot be utilized.

[0081] For example, in the case where neither the spatial relation nor the PL-RS for PUCCH in FR2 is configured or activated, the default assumptions of the spatial relation and the PL-RS (default spatial relation and default PL-RS) are applied for PUCCH. In the case where neither the spatial relation nor the PL-RS for SRS in FR2 is configured or activated, the default assumptions of the spatial relation and the PL-RS (default spatial relation and default PL-RS) are applied for the PUSCH and SRS scheduled by DCI format 0_1.

[0082] When a CORESET is configured in the activated DL BWP on a CC, the default spatial relation and the default PL-RS may also follow the TCI state or QCL assumption of the CORESET with the lowest CORESET ID within the activated DL BWP. When no CORESET is configured in the activated DL BWP on a CC, the default spatial relation and the default PL-RS may also follow the activated TCI state with the lowest TCI state ID of the PDSCH within the activated DL BWP.

[0083] In Rel.15, the spatial relation of the PUSCH scheduled by DCI format 0_0 follows the spatial relation of the PUCCH resource with the lowest PUCCH resource ID among the activated spatial relations of the PUCCH on the same CC. Even when no PUCCH is transmitted on the SCell, the network needs to update the PUCCH spatial relations on all SCells.

[0084] In Rel.16, PUCCH configuration is not required for the PUSCH scheduled by DCI format 0_0. For the PUSCH scheduled by DCI format 0_0, the default spatial relation and the default PL-RS are applied.

[0085] (Multi-TRP)

[0086] In NR, it is being studied that one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP) use one or more panels (multi-panel) to perform DL transmission to the UE. In addition, it is being studied that the UE performs UL transmission to one or more TRPs (see Figure 1 ).

[0087] In Figure 1 an example of the UE performing repeated UL transmission to four TRPs using four transmission opportunities is shown. A transmission opportunity (transmission occasion) may also be a unit of repeated transmission. At least one of time division multiplexing (TDM), frequency division multiplexing (FDM), space division multiplexing (SDM), etc. may be applied to multiple transmission opportunities.

[0088] Multiple TRPs can correspond to the same cell identifier (cell Identifier (ID)), or can correspond to different cell IDs. The cell ID can be either a physical cell ID or a virtual cell ID.

[0089] However, in the NR specifications to date, there has been no sufficient study on how to control the repeated UL transmissions of the UE in the case where multiple panels / TRPs are utilized. For example, regarding the default spatial relationship, default PL-RS, etc. applied by the UE for repeated transmissions, it is not clear.

[0090] For Ultra-Reliable and Low Latency Communications (URLLC), there is a study on not explicitly indicating the UL beam. In this case, the UE is assumed to perform UL transmissions (UL repeated transmissions) based on the default spatial relationship and default PL-RS. In such a situation, if the default spatial relationship, etc. are not appropriately determined, the repeated transmissions cannot be appropriately performed.

[0091] In the case where the repeated transmissions for multiple TRPs are not appropriately performed, there is a concern about a reduction in throughput or deterioration in communication quality.

[0092] Therefore, the inventors of the present invention have come up with a method for appropriately determining the spatial relationship / PL-RS for repeated transmissions. According to one aspect of the present disclosure, for example, the UE can use different beams for each repetition unit (e.g., time slot, sub-time slot) to perform repeated transmissions for multiple TRPs.

[0093] Hereinafter, embodiments related to the present disclosure will be described in detail with reference to the drawings. The wireless communication methods related to the respective embodiments can be applied separately or in combination.

[0094] In addition, in the present disclosure, "A / B" can also mean "at least one of A and B".

[0095] In the present disclosure, the panel, uplink (UL) transmission entity, TRP, spatial relationship, control resource set (CORESET), PDSCH, codeword, base station, specific antenna port (e.g., demodulation reference signal (DMRS) port), specific antenna port group (e.g., DMRS port group), specific group (e.g., code division multiplexing (CDM) group, specific reference signal group, CORESET group), CORESET pool, etc. can also be replaced with each other. In addition, the TRP identifier (ID) and the TRP can also be replaced with each other.

[0096] In addition, the CORESET in the following embodiments can either refer to the CORESET associated with a certain BWP or the CORESET associated with a certain cell (any BWP of the cell).

[0097] In the present disclosure, the index, ID, indicator, resource ID, etc. can also be replaced with each other. In the present disclosure, the beam, TCI, TCI state, DL TCI state, UL TCI state, unified TCI state, QCL, QCL assumption, spatial relationship, spatial relationship information, SRI, SRS resource, precoder, etc. can also be replaced with each other. In addition, the TCI state ID#i (i is an integer) can also be denoted as TCI#i.

[0098] In the present disclosure, the list, group, set (collection), subset, cluster, etc. can also be replaced with each other.

[0099] In the following embodiments, the PUCCH / PUSCH / SRS across multiple TRPs can be replaced with the repeated PUCCH / PUSCH / SRS across multiple TRPs, or simply replaced with the repeated PUCCH / PUSCH / SRS, repeated transmission, etc.

[0100] Hereinafter, in the present disclosure, the default spatial relationship can be replaced with the default spatial relationship of the PUSCH / PUCCH / SRS for repeated transmission, or simply replaced with the default spatial relationship for repeated transmission, etc.

[0101] In addition, the spatial relationship (or default spatial relationship) of the present disclosure can also be replaced with the PL-RS (or default PL-RS). That is, in the following embodiments, the determination of the spatial relationship for repeated transmission is mainly described, but the present disclosure also supports the determination of the PL-RS for repeated transmission (e.g., repeated transmission of PUCCH / PUSCH / SRS).

[0102] (Wireless communication method)

[0103] <First Embodiment>

[0104] The first embodiment relates to the default spatial relationship for each transmission opportunity for repeated transmission. Figure 2A And Figure 2B is a diagram showing an example of the default spatial relationship for repeated transmission. Figure 2A And Figure 2B corresponds to four repeated UL transmissions. In addition, in the following figures, regarding the TRP, repeated transmission / reception, etc., different hatching can also mean different spatial relationships (beams).

[0105] The default spatial relationship can also be the same (or common) in each transmission opportunity (Embodiment 1.1). In this case, for example, the same QCL can be applied to the DMRS across multiple time slots, so better channel estimation accuracy in the TRP can be ensured. In Figure 2A an example is shown in which the UE performs repeated transmission for each transmission opportunity following the same spatial relationship #0.

[0106] The UE can also be assumed that the same one default spatial relationship is selected by any of the following:

[0107] · The same rule as Rel.16 (Embodiment 1.1.1),

[0108] · The TCI state / QCL of the scheduling DCI (Embodiment 1.1.2),

[0109] · The TCI state of the set / activated PL-RS (Embodiment 1.1.3).

[0110] In Embodiment 1.1.1, as described above for Rel.16 NR, the default spatial relationship can also be the spatial relationship corresponding to the smallest CORESET ID or the smallest TCI state ID.

[0111] According to Embodiment 1.1.1, the default spatial relationship can be determined in the same way as the conventional rules, so the implementation of the UE is easy.

[0112] In Embodiment 1.1.2, the default spatial relation may also be the spatial relation corresponding to the TCI state of the CORESET in which the scheduling DCI is detected.

[0113] According to Embodiment 1.1.2, UL transmission can be performed based on the successfully received beam, so the success of UL transmission can be expected.

[0114] In Embodiment 1.1.3, the default spatial relation may also be the spatial relation corresponding to the TCI state of the PL-RS set by RRC or the PL-RS activated by MAC CE.

[0115] According to Embodiment 1.1.3, UL transmission can be performed based on the beam of the PL-RS set or activated (in other words, considered to represent a proper channel between the UE and the base station) used in the repeated transmission power control, so the success of UL transmission can be expected.

[0116] The default spatial relation may also be different in each transmission opportunity (Embodiment 1.2). In this case, for example, multiple TRPs are used, thereby enabling better robustness (spatial diversity) for suppressing blocking. In Figure 2B An example is shown in which the UE performs repeated transmissions for the first to fourth transmission opportunities following different spatial relations #0 - #3 respectively.

[0117] The UE may also assume that multiple default spatial relations for multiple transmission opportunities are derived according to any one of the following:

[0118] · The TCI state ID / QCL ID of each CORESET (Embodiment 1.2.1),

[0119] · The order of the TCI state ID / QCL ID / spatial relation ID indicated by RRC / MAC CE (which may be interchangeable with setting, activation, etc.) (Embodiment 1.2.2),

[0120] · The TCI state / QCL determined in advance for at least one transmission opportunity and the TCI state / QCL set / activated for the remaining transmission opportunities (Embodiment 1.2.3),

[0121] · The order of the beam IDs indicated by RRC / MAC CE (Embodiment 1.2.4),

[0122] · The order of the CORESETs determined in advance or indicated by RRC / MAC CE (Embodiment 1.2.5).

[0123] In Embodiment 1.2.1, multiple default spatial relations may also include TCI states corresponding to all CORESETs that are set. For example, a UE for which CORESETs #0-#2 are set may also transmit in the first to fourth transmission opportunities of Figure 2B while following the TCI state of CORESET #0, the TCI state of CORESET #1, the TCI state of CORESET #2, and the TCI state of CORESET #0, respectively.

[0124] According to Embodiment 1.2.1, compared with Rel.16, even without additional / specific signaling, the UE can determine the default spatial relations for multiple TRPs, and thus the increase in communication traffic related to the notification of the default spatial relations can be suppressed.

[0125] In Embodiment 1.2.2, multiple default spatial relations may also correspond to the ordering of specific spatial relation IDs that are set / activated. This ordering may also be specified by a list including multiple sets as follows, where the sets are sets of an index (which may also be referred to as an ordering index) indicating the spatial relation corresponding to the nth transmission opportunity and the TCI state ID corresponding to this index. In addition, this index may be implicitly included in this list. Furthermore, the index may start from 0.

[0126] In addition, the ordering of these spatial relation IDs may also be referred to as a list / set / group / sequence, etc. of spatial relation IDs (or spatial relations).

[0127] Figure 3 FIG. shows an example of the ordering of the spatial relation IDs related to Embodiment 1.2.2. In this example, for indices 1-4, they are respectively associated with TCI state IDs #0-#3. In this case, the UE may also transmit while following TCI state IDs #0-#3 in the first to fourth transmission opportunities of Figure 2B respectively.

[0128] According to Embodiment 1.2.2, the UE can easily determine the default spatial relations for multiple TRPs.

[0129] In Embodiment 1.2.3, the UE may also determine the default spatial relation for at least one transmission opportunity among multiple default spatial relations based on, for example, the determination of one default spatial relation shown in Embodiment 1.1 (Embodiments 1.1.1-1.1.3). In addition, the UE may also determine the default spatial relations for the remaining transmission opportunities based on, for example, the determination of multiple default spatial relations shown in Embodiment 1.2.1 or 1.2.2.

[0130] In addition, at least one of the above-mentioned transmission opportunities for determining the default spatial relationship shown in Embodiment 1.1 may be the repeated initial (i.e., first) transmission opportunity, or may be a specific (e.g., last) transmission opportunity other than this.

[0131] Figure 4A And Figure 4B FIG. shows an example of the default spatial relationship related to Embodiment 1.2.3. In this example, it is assumed that the number of repeated transmissions is 4.

[0132] Figure 4A FIG. shows an example in which the default spatial relationship of the first transmission opportunity is determined based on Embodiment 1.1.1, and the default spatial relationships of the second to fourth transmission opportunities are determined based on Embodiment 1.2.2. The default spatial relationship of the first transmission opportunity is a pre-determined (e.g., the smallest CORESET ID) spatial relationship.

[0133] Figure 4B FIG. shows an example in which the default spatial relationship of the first transmission opportunity is determined based on Embodiment 1.1.2, and the default spatial relationships of the second to fourth transmission opportunities are determined based on Embodiment 1.2.2. The default spatial relationship of the first transmission opportunity is a spatial relationship implicitly notified by the TCI state of the scheduling DCI (e.g., DCI formats 0_0, 0_1, 0_2, etc.) for repeated transmissions.

[0134] According to Embodiment 1.2.3, for example, the default spatial relationship of the initial time slot for multi-time slot repeated transmissions becomes the same behavior as the default spatial relationship of a single time slot (without repetition), which can suppress the complexity of UE control.

[0135] In Embodiment 1.2.4, multiple default spatial relationships may also correspond to the ordering of specific beam IDs that are set / activated. This ordering may also be specified by a list including multiple sets, where each set is a set representing the index of which beam (which may also be referred to as the order index) and the beam ID corresponding to this index. In addition, this index may be implicitly included in this list. Furthermore, the index may start from 0.

[0136] In addition, the ordering of these beam IDs may also be referred to as a list / set / group / sequence, etc. of beam IDs (or beams).

[0137] The default spatial relationship of the first transmission opportunity for repeated transmissions may be either the beam ID corresponding to the starting position (starting index) or the beam ID corresponding to the starting ID.

[0138] The default spatial relationship for the i-th transmission opportunity for repeated transmission can be either the beam ID corresponding to the index of mod({starting index + i - 2}, number of repeated transmissions) + 1, or the beam ID corresponding to the index of mod({(index of the set with the starting ID) + i - 2}, number of repeated transmissions) + 1. Additionally, mod(X, Y) means the remainder when X is divided by Y (modulo operation).

[0139] In the above-described Embodiment 1.2.4, the UE can also determine the above-mentioned starting ID or starting position based on at least one of the following:

[0140] · The TCI state of the scheduling DCI,

[0141] · The default TCI state / default QCL assumption,

[0142] · An explicit indication based on RRC / MAC / DCI (e.g., notification of information related to the starting ID),

[0143] · The TCI state of the configured / activated PL-RS,

[0144] · The starting time position of the transmission (e.g., starting time slot, starting sub-time slot, starting frame, starting sub-frame, starting symbol).

[0145] Furthermore, in the above-described Embodiment 1.2.4, the UE can also assume the above-mentioned starting ID as a specific beam ID in the configured / activated / pre-determined beam order (e.g., the smallest beam ID. In the case of Figure 5A described later, it is beam ID #1).

[0146] Furthermore, in the above-described Embodiment 1.2.4, the UE can also assume the above-mentioned starting position (starting index) as a specific index related to the configured / activated / pre-determined beam order (e.g., the smallest index. In the case of Figure 5A described later, it is sequence index 1).

[0147] Figure 5A And Figure 5B is a diagram showing an example of the order of beam IDs related to Embodiment 1.2.4. As Figure 5A shown, in this example, for indices 1 - 4, they are respectively associated with beam IDs #1 - #4. If the UE determines, for example, that the starting ID is beam ID #1, it can also transmit following beam IDs #1 - #4 respectively in the first - fourth transmission opportunities of Figure 2B .

[0148] Figure 5B is showing Figure 5AA diagram of the migration of the order of beam IDs. That is, if the index of a certain transmission opportunity is 4, the index of its next transmission opportunity becomes 1.

[0149] According to Embodiment 1.2.4, the UE can easily determine the default spatial relationship for multiple TRPs. In addition, the UE can flexibly control the use of the best beam for the first transmission opportunity.

[0150] In the above Embodiment 1.2.5, the content in which the beam order of Embodiment 1.2.4 is replaced with the CORESET (or CORESET ID) order can also be used. For example, the starting ID (starting position) of the CORESET can also be determined based on the same parameters as the description of the starting ID for Embodiment 1.2.4.

[0151] In addition, the network can also set one of the best three TCI states for each CORESET. In this case, if the CORESET order includes three CORESETS, the UE can determine the spatial relationship in accordance with the above best three TCI states.

[0152] Figure 6 A diagram showing an example of the order of the CORESET related to Embodiment 1.2.5. In this example, it is assumed that the CORESET order is pre-determined to be the order of CORESET#0, #1, #2. When the default spatial relationship of a certain transmission opportunity follows the TCI of CORESET#2, the default spatial relationship of its next transmission opportunity can also follow the TCI of CORESET#0.

[0153] According to Embodiment 1.2.5, the UE can easily determine the default spatial relationship for multiple TRPs. When the CORESET order is pre-specified, no additional signaling related to the CORESET order is required.

[0154] [Modification Example of Embodiment 1.2]

[0155] In the above Embodiments 1.2.1 - 1.2.5, when the number of derived default spatial relationships is the same as the number of retransmission times (the number of UL transmission opportunities), one-to-one mapping can be performed, but in cases where this is not the case, one-to-one mapping may not be required.

[0156] When the number of the derived multiple default spatial relations (beams) is greater than the number of repeated transmissions (the number of UL transmission opportunities), the first N (N is the number of repetitions) IDs starting from the larger (or smaller) side of the ID (CORESET ID, TCI state ID, spatial relation ID, beam ID, etc.) corresponding to the default spatial relation can also be applied in each repeated transmission opportunity. For example, in the case of Embodiment 1.2.1, if the number of CORESETs (e.g., 3) is greater than the number of repetitions (e.g., 2), the TCI states of two CORESET IDs (e.g., CORESET#0, #1) can also be applied in the first - second transmission opportunities respectively.

[0157] In addition, regarding "starting from the larger (or smaller) side" here, for example, in Embodiments 1.2.4 and 1.2.5, it can also be replaced with "starting from the starting index (or starting ID)", etc.

[0158] When the number of the derived multiple default spatial relations (beams) is less than the number of repeated transmissions (the number of UL transmission opportunities), the ID (CORESET ID, TCI state ID, spatial relation ID, beam ID, etc.) corresponding to the default spatial relation can also be applied to each repeated transmission opportunity based on at least one of the first method (e.g., cyclic manner) and the second method (e.g., sequential manner).

[0159] For example, in the case of Embodiment 1.2.1, if the number of CORESETs (e.g., 2) is less than the number of repetitions (e.g., 4), the TCI states of two CORESET IDs (e.g., CORESET#0, #1) can also be applied in the first - fourth transmission opportunities respectively.

[0160] In the case of the cyclic method, for example, the TCI of CORESET#0, the TCI of CORESET#1, the TCI of CORESET#0, and the TCI of CORESET#1 can also be used in the first, second, third, and fourth transmission opportunities respectively. In the case of the sequential method, for example, the TCI of CORESET#0, the TCI of CORESET#0, the TCI of CORESET#1, and the TCI of CORESET#1 can also be used in the first, second, third, and fourth transmission opportunities respectively.

[0161] According to the first embodiment described above, the UE can appropriately determine the default spatial relation for repeated transmission.

[0162] <Second Embodiment>

[0163] The second embodiment describes the cases of whether to apply the first embodiment and other embodiments based on UE capabilities.

[0164] When at least one of the following UE capabilities is reported, at least one of the first embodiment and other embodiments can also be applied:

[0165] · Whether different TCI / QCL / spatial relationships can be applied for each transmission opportunity,

[0166] · Whether different TCI states can be applied to the default TCI state / QCL / spatial relationship / PL-RS for each transmission opportunity,

[0167] · The number of supported TCI states / QCL / spatial relationships,

[0168] · The number of supported CORESETs,

[0169] · The number of beam switches (beam switching times) between all transmission opportunities for repeated transmission of the same data.

[0170] In addition, when information related to a certain number is reported as a UE capability, when the number is above (or below) a specific value, at least one of the first embodiment and other embodiments can also be applied.

[0171] According to the second embodiment described above, it is possible to appropriately control the judgment related to the spatial relationship of repeated transmission based on UE capabilities.

[0172] <Third Embodiment>

[0173] The third embodiment relates to HARQ-ACK transmission using PUCCH / PUSCH for repeated PDSCH across multiple TRPs. The UE can also use the PUCCH / PUSCH to repeatedly transmit one or more HARQ-ACKs in multiple transmission opportunities (e.g., multiple time slots, multiple mini time slots).

[0174] The spatial relationship of each transmission opportunity of PUCCH / PUSCH can also be derived in the same way as in the first embodiment. In other words, the default spatial relationship of the first embodiment can also be interchanged with the (default) spatial relationship of each transmission opportunity of the PUCCH / PUSCH.

[0175] The spatial relationship of each transmission opportunity of PUCCH / PUSCH can also be derived according to the set of TCI states of the corresponding PDSCH reception. For example, the UE can also determine the spatial relationship of each transmission opportunity of PUCCH / PUSCH based on any one of the following:

[0176] · A TCI state of the corresponding PDSCH (which can also be replaced by PDSCH multi-slots, PDSCH reception opportunities. The same applies hereinafter).

[0177] · All TCI states of the corresponding PDSCH

[0178] · Multiple (e.g., N) TCI states of the corresponding PDSCH.

[0179] Regarding which one of these is used for the decision, the UE can also be notified via higher-layer signaling (e.g., RRC, MAC CE), etc.

[0180] In addition, the spatial relationship of each transmission opportunity derived from the above set can also be referred to as the default spatial relationship.

[0181] Figure 7A 、 Figure 7B 、 Figure 8A and Figure 8B are diagrams showing an example of the spatial relationship of each transmission opportunity of PUCCH / PUSCH for transmitting HARQ-ACK related to the third embodiment. In each example, the repeated transmission of PDSCH from multiple TRPs (repetition times 4) is described on the left, and the repeated transmission of HARQ-ACK corresponding to the PDSCH (repetition times 4) is described on the right. In each diagram, the dotted line indicates the beam (spatial relationship) of the transmission opportunity of PUCCH / PUSCH that is the same as the beam (TCI state) of the reception opportunity of PDSCH.

[0182] In addition, regarding the beams of each reception opportunity of PDSCH, different examples are shown, but it is not limited thereto.

[0183] In Figure 7A , the spatial relationship of the first - fourth transmission opportunities of PUCCH / PUSCH is determined based on the TCI state of the first reception opportunity of all PDSCHs. In addition, regarding which reception opportunity of PDSCH (which can also be replaced by the reference destination time slot number, repeated time slot index, etc.) is used to determine the spatial relationship of each transmission opportunity of PUCCH / PUSCH, it can be determined in advance by a standard or set via higher-layer signaling.

[0184] In Figure 7B , the spatial relationship of the first - fourth transmission opportunities of PUCCH / PUSCH is determined based on the TCI states of the first - fourth reception opportunities of PDSCH, respectively. In addition, the mapping between the transmission opportunity of PUCCH / PUSCH and the reception opportunity of PDSCH may not be as Figure 7Bin the same order as shown. For this mapping, it can be determined in advance by a standard or set by higher-layer signaling (e.g., RRC, MAC CE, etc.).

[0185] Figure 8A and Figure 8B An example of determining the spatial relationship of each transmission opportunity of PUCCH / PUSCH based on N (= 2) TCI states of the corresponding PDSCH is shown.

[0186] In Figure 8A , the spatial relationships of the first to fourth transmission opportunities of PUCCH / PUSCH are determined respectively based on the TCI states of the first, first, second, and second reception opportunities of the PDSCH (the above-mentioned successive mapping method). In Figure 8B , the spatial relationships of the first to fourth transmission opportunities of PUCCH / PUSCH are determined respectively based on the TCI states of the first, second, first, and second reception opportunities of the PDSCH (the above-mentioned cyclic mapping method).

[0187] The UE can also determine (select) the above N TCI states from the TCI states of each reception opportunity (time slot, sub-time slot, etc.) of the repeated PDSCH based on at least one of the following.

[0188] · TCI states corresponding to N reception opportunities starting from the first or the last,

[0189] · Among the set / activated TCI states, N TCI state IDs starting from the larger (or smaller) side of the TCI state ID,

[0190] · Among the TCI states corresponding to each reception opportunity, N TCI state IDs starting from the larger (or smaller) side of the TCI state ID,

[0191] · TCI states corresponding to N CORESETs starting from the larger (or smaller) side of the CORESET ID among the CORESETs corresponding to each reception opportunity,

[0192] · TCI states corresponding to N TRPs (or CORESET pools) starting from the larger (or smaller) side of the TRP index (or CORESET pool index) among the TRPs (or CORESET pools) corresponding to each reception opportunity.

[0193] In Figure 8A and Figure 8B 's example, the UE uses the TCI states corresponding to the first two reception opportunities in the repeated PDSCH for repeated transmission.

[0194] The N TCI states applied to repeated transmissions may also correspond to the best N beams measured by the UE. For example, the UE may also measure reference signals transmitted using multiple beams and report to the network the beam reports of the beams with the top measurement results for L1-SINR / L1-RSRP, etc. The base station may also, based on this report, instruct the UE to include the best N TCI states as the TCI states for receiving the PDSCH scheduled on this UE.

[0195] Compared with the case where the UE uses a number of beams larger than the top N of the measurement results in repeated transmissions, if the UE uses the top N beams of the measurement results in repeated transmissions, an improvement in communication characteristics can be expected.

[0196] In addition, if the best one beam in the timing of repeated transmissions is known, from the perspective of communication characteristics, it is preferable to use only this beam for repeated transmissions. However, in practice, due to the existence of blockage, environmental changes, etc. that contain random elements, it is difficult to know the instantaneous best beam at the communication time point. Therefore, if the best N beams are used for diversity transmission / reception, an improvement in the reliability of communication can be expected. However, from the diversity perspective, N is at most assumed to be 2 or 4 (because it is difficult to consider that all two or four beams are blocked simultaneously). The above N can be determined in advance by the specification or can be set for the UE by higher layer signaling.

[0197] According to the third embodiment described above, the UE can appropriately determine the spatial relationship used in the repeated transmission of HARQ-ACK corresponding to the repeated reception of the PDSCH.

[0198] <Other>

[0199] Each of the above embodiments can be used independently for each channel / signal or can be used commonly in multiple channels / signals. For example, the default spatial relationships of PUCCH / PUSCH / SRS can be determined by different methods respectively or can be determined by a common method.

[0200] For example, the higher layer signaling (e.g., RRC signaling for setting the beam order) used in the present disclosure can be set independently for each channel / signal or can be set for multiple channels / signals uniformly through one parameter (in this case, this one parameter is applied to these multiple channels / signals).

[0201] For example, the higher layer signaling for PUSCH (beam order, etc. for PUSCH) can also be set using at least one of the following:

[0202] ·Parameters included in the PUSCH configuration information (PUSCH-Config information element),

[0203] ·Parameters associated with the transmit power control (Transmit Power Control (TPC)) of PUSCH (e.g., parameters included in the PUSCH-PowerControl information element),

[0204] ·Parameters associated with the beam of PUSCH,

[0205] ·Parameters associated with the resource notification of PUSCH (PUSCH resources, time-domain resource allocation list (PUSCH-TimeDomainResourceAllocationList information element), part of the field indicating the PUSCH repetition number notified by higher-layer parameters or DCI (e.g., can also be referred to as the PUSCH repetition number field, etc.), part of the frequency-domain resource allocation field notified by higher-layer parameters or DCI),

[0206] ·Parameters associated with the resource notification of PUCCH (PUCCH resources (PUCCH-Resource information element), PUCCH resource sets (PUCCH-ResourceSet information element), part of the field indicating the PUCCH repetition number notified by higher-layer parameters or DCI (e.g., can also be referred to as the PUCCH repetition number field, etc.), part of the PUCCH resource indicator field included in DCI, part of the PUCCH resources indicated by the PUCCH resource indicator field included in DCI).

[0207] For example, at least one of the following can be set for the higher-layer signaling for PUCCH (such as the beam order for PUCCH):

[0208] ·Parameters included in the PUCCH configuration information (PUSCH-Config information element),

[0209] ·Parameters associated with the transmit power control of PUCCH (e.g., parameters included in the PUCCH-PowerControl information element),

[0210] ·Parameters associated with the beam of PUCCH,

[0211] ·The above-mentioned parameters associated with the resource notification of PUCCH,

[0212] ·The above-mentioned parameters associated with the resource notification of PUSCH.

[0213] In addition, the high-layer signaling for multiple channels / signals can be configured either per UL BWP (e.g., included in the BWP-Uplink information element) or per cell (e.g., included in the ServingCellConfig information element).

[0214] In addition, the DCI (or a field of the DCI) in the present disclosure can also be replaced with an implicit notification using the DCI. The implicit notification using the DCI can also include at least one of the time resource, frequency resource, control channel element (CCE) index, physical resource block (PRB) index, resource element (RE) index, search space index, control resource set (CORESET) index, and aggregation level of the (detected) DCI (or corresponding to the DCI or used in reception).

[0215] In addition, each of the above-described embodiments can be applied either when multi-TRP or multi-panel operation is configured for the UE or when it is not. Further, each of the above-described embodiments can be applied either when the UE performs URLLC-based operation (or has the capability for URLLC) or when it is not.

[0216] (Wireless communication system)

[0217] Hereinafter, the structure of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above-described embodiments of the present disclosure.

[0218] Figure 9 FIG. is an example showing a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 can also be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0219] In addition, the wireless communication system 1 may also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple Radio Access Technologies (RATs). MR-DC may also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and so on.

[0220] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the Secondary Node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0221] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both the MN and the SN are base stations (gNBs) of NR (NR-NR Dual Connectivity (NN-DC))).

[0222] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a - 12c) that is configured within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located within at least one cell. The configuration, quantity, etc. of each cell and the user terminal 20 are not limited to the manner shown in the figure. Hereinafter, without distinguishing between the base stations 11 and 12, they are collectively referred to as the base station 10.

[0223] The user terminal 20 may also be connected to at least one of the multiple base stations 10. The user terminal 20 may also utilize at least one of Carrier Aggregation (CA) and Dual Connectivity (DC) that uses multiple Component Carriers (CCs).

[0224] Each CC may also be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may also be a frequency band below 6 GHz (sub-6 GHz), and FR2 may also be a frequency band above 24 GHz (above-24 GHz). Additionally, the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these. For example, FR1 may also correspond to a frequency band higher than FR2.

[0225] Furthermore, the user terminal 20 may also communicate in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0226] Multiple base stations 10 may also be connected by wire (e.g., optical fiber based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is utilized as a backhaul between base stations 11 and 12, the base station 11, which is the upper station, may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12, which is the relay station (relay), may also be referred to as an IAB node.

[0227] 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, for example, also include at least one of an Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0228] The user terminal 20 may also be a terminal supporting at least one of communication modes such as LTE, LTE-A, 5G, etc.

[0229] In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) can also 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. can also be used.

[0230] The wireless access method can also be referred to as a waveform. Additionally, in the wireless communication system 1, in the wireless access methods of the UL and the DL, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) can also be used.

[0231] As a downlink channel, in the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc., which are shared among the respective user terminals 20, can also be used.

[0232] Furthermore, as an uplink channel, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc., which are shared among the respective user terminals 20, can also be used.

[0233] User data, high-layer control information, System Information Block (SIB), etc. are transmitted through the PDSCH. User data, high-layer control information, etc. can also be transmitted through the PUSCH. In addition, the Master Information Block (MIB) can also be transmitted through the PBCH.

[0234] Low-layer control information can also be transmitted through the PDCCH. The low-layer control information can also include, for example, downlink control information (Downlink Control Information (DCI)), and the downlink control information includes scheduling information for at least one of the PDSCH and the PUSCH.

[0235] In addition, the DCI for scheduling the PDSCH can also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH can also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH can also be replaced by DL data, and the PUSCH can also be replaced by UL data.

[0236] In the detection of the PDCCH, the Control Resource Set (CORESET) and the search space can also be utilized. The CORESET corresponds to the resource for searching for the DCI. The search space corresponds to the search area and search method for PDCCH candidates. One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a certain search space based on the search space setting.

[0237] One search space can also correspond to PDCCH candidates equivalent to one or more aggregation levels. One or more search spaces can also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", etc. in the present disclosure can also be replaced with each other.

[0238] Uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), delivery confirmation information (e.g., which may also be referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (Scheduling Request (SR)) can also be transmitted via PUCCH. The random access preamble for establishing a connection with a cell can also be transmitted via PRACH.

[0239] In addition, in the present disclosure, the downlink, uplink, etc. can also be expressed without "link". Furthermore, it can also be expressed without "Physical" at the beginning of various channels.

[0240] In the wireless communication system 1, synchronization signal (Synchronization Signal (SS)), downlink reference signal (Downlink Reference Signal (DL-RS)), etc. can also be transmitted. As the DL-RS, in the wireless communication system 1, cell-specific reference signal (Cell-specific Reference Signal (CRS)), channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), demodulation reference signal (DeModulation Reference Signal (DMRS)), positioning reference signal (Positioning Reference Signal (PRS)), phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. can also be transmitted.

[0241] The synchronization signal can, for example, also be at least one of the primary synchronization signal (Primary Synchronization Signal (PSS)) and the secondary synchronization signal (Secondary Synchronization Signal (SSS)). The signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) can also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. can also be referred to as reference signals.

[0242] In addition, in the wireless communication system 1, as the uplink reference signal (UL-RS), it is also possible to transmit a reference signal for measurement (sounding reference signal (SRS)), a demodulation reference signal (DMRS), etc. In addition, the DMRS can also be referred to as a user terminal-specific reference signal (UE-specific Reference Signal).

[0243] (Base station)

[0244] Figure 10 FIG. is an example showing the structure of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission path interface (transmission line interface) 140. In addition, one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140 may be provided respectively.

[0245] In addition, in this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and it can also be assumed that the base station 10 also has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0246] The control unit 110 implements overall control of the base station 10. The control unit 110 can be composed of a controller, a control circuit, etc. that can be explained based on the common knowledge in the technical field related to the present disclosure.

[0247] The control unit 110 may also control the generation, scheduling (e.g., resource allocation, mapping), etc. of signals. The control unit 110 may also control transmission / reception, measurement, etc. using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, a sequence, etc. to be transmitted as signals, and forward them to the transmission / reception unit 120. The control unit 110 may also perform call processing (setting, releasing, etc.) of communication channels, state management of the base station 10, management of radio resources, etc.

[0248] The transmitting and receiving unit 120 may also include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception 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 measurement circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0249] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may also be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may also be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0250] The transmitting and receiving antenna 130 may be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0251] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channels, uplink reference signals, etc.

[0252] The transmitting and receiving unit 120 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc., to form at least one of a transmitting beam and a receiving beam.

[0253] The transmitting and receiving unit 120 (transmission processing unit 1211), for example, may also perform processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (e.g., RLC retransmission control), processing of the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc., on the data, control information, etc., obtained from the control unit 110, and generate a bit string to be transmitted.

[0254] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing such as channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering), Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0255] The transmission / reception unit 120 (RF unit 122) can also perform modulation to the radio frequency band, filter processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0256] On the other hand, the transmission / reception unit 120 (RF unit 122) can also perform amplification, filter processing, demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 130.

[0257] The transmission / reception unit 120 (reception processing unit 1212) can also perform reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal, and obtain user data, etc.

[0258] The transmission / reception unit 120 (measurement unit 123) may also perform measurements related to the received signal. For example, the measurement unit 123 may also perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may also perform measurements on received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0259] The transmission path interface 140 may also transmit and receive signals (backhaul signaling) between the device included in the core network 30, other base stations 10, etc., and may also obtain and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0260] 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 / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0261] In addition, the transmission / reception unit 120 may also send information (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, and Downlink Control Information (DCI)) for determining one or more default spatial relationships to be applied in each transmission opportunity of the retransmission on the uplink to the user terminal 20.

[0262] The transmission / reception unit 120 may also receive the retransmission (from the user terminal 20) using the spatial domain transmission filter based on the one or more default spatial relationships.

[0263] (User Terminal)

[0264] Figure 11 FIG. is an example showing the structure of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided respectively.

[0265] In addition, in this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and it can also be assumed that the user terminal 20 further has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0266] The control unit 210 implements the overall control of the user terminal 20. The control unit 210 can be constituted by a controller, a control circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0267] The control unit 210 may also control the generation, mapping, etc. of signals. The control unit 210 may also control the transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / 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 / reception unit 220.

[0268] The transmission / reception unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmission / reception unit 220 can be constituted by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0269] The transmission / reception unit 220 may be constituted as an integrated transmission / reception unit, or may be constituted by a transmission unit and a reception unit. The transmission unit may be constituted by the transmission processing unit 2211 and the RF unit 222. The reception unit may be constituted by the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0270] The transmission / reception antenna 230 can be constituted by an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0271] The transmission / reception unit 220 may also receive the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission / reception unit 220 may also transmit the above-mentioned uplink channels, uplink reference signals, etc.

[0272] The transmission / reception unit 220 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmission beam and a reception beam.

[0273] The transmission / reception unit 220 (transmission processing unit 2211) may also perform, for example, PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210 to generate a bit string to be transmitted.

[0274] The transmission / reception unit 220 (transmission processing unit 2211) may also perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted and output a baseband signal.

[0275] In addition, regarding whether to apply DFT processing, it may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is effective (enabled), the transmission / reception unit 220 (transmission processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using the DFT-s-OFDM waveform. In other cases, the transmission / reception unit 220 (transmission processing unit 2211) may not perform DFT processing as the above-mentioned transmission processing.

[0276] The transmission / reception unit 220 (RF unit 222) may also perform modulation to a radio frequency band, filter processing, amplification, etc. on the baseband signal and transmit the radio frequency band signal via the transmission / reception antenna 230.

[0277] On the other hand, the transmission / reception unit 220 (RF unit 222) may also perform amplification, filter processing, demodulation to a baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 230.

[0278] The transmission / reception unit 220 (reception processing unit 2212) may also perform reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal to obtain user data, etc.

[0279] The transmission / reception unit 220 (measurement unit 223) may also perform measurements related to the received signal. For example, the measurement unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may also perform measurements on 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.

[0280] In addition, the transmission unit and the reception unit of the user terminal 20 in the present disclosure may also be constituted by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0281] In addition, the control unit 210 may also determine at least one of one or more default spatial relationships and default PL-RSs to be applied in each transmission opportunity of the uplink retransmission. In addition, the retransmission may be a retransmission of at least one of an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), and a measurement reference signal (Sounding Reference Signal (SRS)).

[0282] The transmission / reception unit 220 may also perform the retransmission using a spatial domain transmission filter based on the one or more default spatial relationships. The transmission / reception unit 220 may also perform the retransmission using transmission power control based on the one or more default PL-RSs. In the case where different default PL-RSs are used for each transmission opportunity, the transmission power of each transmission opportunity may also be different.

[0283] The control unit 210 may also make a decision such that the one or more default spatial relationships include transmission configuration indication (TCI) states corresponding to all the configured control resource sets (CORESETs).

[0284] The control unit 210 may also make a decision such that the one or more default spatial relationships correspond to the order of the configured or activated spatial relationship IDs.

[0285] In the case where the repeated transmission is a repeated transmission of a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) for repeated reception of a downlink shared channel, the control unit 210 may also derive the one or more default spatial relationships based on a set of Transmission Configuration Indication (TCI) states of the repeated reception.

[0286] (Hardware Structure)

[0287] In addition, the block diagrams used in the description of the above embodiments illustrate blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. Furthermore, the implementation method of each functional block is not particularly limited. That is, each functional block may be implemented by a single device physically or logically combined, or may be implemented by two or more physically or logically separated devices directly or indirectly (e.g., by wire, wireless, etc.) connected with these multiple devices. The functional block may also be implemented by combining the above single device or the above multiple devices with software.

[0288] Here, in the functions, there are judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, regarded as, broadcasting, notification, communication, forwarding, configuration (setting), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment, etc., but are not limited to these. For example, a functional block (structural unit) that implements a transmission function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0289] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may also function as a computer that processes the wireless communication method of the present disclosure. Figure 12It is a diagram showing an example of the hardware configurations of the base station and the user terminal according to an embodiment. The above base station 10 and user terminal 20 may physically be configured as computer devices including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0290] In addition, in the present disclosure, terms such as device, circuit, equipment, section, unit, etc. can be replaced with each other. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured not to include some devices.

[0291] For example, only one processor 1001 is illustrated, but there may be multiple processors. In addition, the processing may be executed by one processor, or may be executed by two or more processors simultaneously, sequentially, or by other means. Further, the processor 1001 may also be implemented by one or more chips.

[0292] Regarding each function in the base station 10 and the user terminal 20, for example, by reading a specific software (program) into hardware such as the processor 1001 and the memory 1002, the processor 1001 performs operations and controls communication via the communication device 1004, or controls at least one of reading and writing data in the memory 1002 and the storage 1003, thereby realizing it.

[0293] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may also be constituted by a central processing device (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, registers, etc. For example, at least a part of the above control unit 110 (210), transmission / reception unit 120 (220), etc. may also be implemented by the processor 1001.

[0294] In addition, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and performs various processes according to them. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiment can be used. For example, the control unit 110 (210) may also be implemented by a control program stored in the memory 1002 and operating in the processor 1001, and the same can be applied to other functional blocks.

[0295] The memory 1002 may also be a computer-readable recording medium, which is constituted by at least one of, for example, a read only memory (ROM), an erasable programmable read only memory (EPROM), an electrically erasable programmable read only memory (EEPROM), a random access memory (RAM), and other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store a program (program code), a software module, etc. that can be executed to implement the wireless communication method according to an embodiment of the present disclosure.

[0296] The storage 1003 may also be a computer-readable recording medium, which is constituted by at least one of, for example, a flexible disc, a floppy (registered trademark) disc, an optical disc (such as a compact disc (compact disc read only memory (CD-ROM)), etc.), a digital versatile disc, a Blu-ray (registered trademark) disc, a removable disc, a hard disk drive, a smart card, a flash device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0297] The communication device 1004 is hardware (a transmitting and receiving device) for performing inter-computer communication via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. In order to implement at least one of, for example, frequency division duplex (FDD) and time division duplex (TDD), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-described transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be physically or logically separated and implemented by a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0298] The input device 1005 is an input device that accepts external input (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that performs output to the outside (e.g., display, speaker, Light Emitting Diode (LED) lamp, etc.). Additionally, the input device 1005 and the output device 1006 may also be integrated (e.g., touch panel).

[0299] Furthermore, each device such as the processor 1001 and the memory 1002 is connected via a bus 1007 for communicating information. The bus 1007 may be constituted by a single bus or by different buses between the devices.

[0300] 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), a Field Programmable Gate Array (FPGA), etc., and part or all of the functional blocks may be implemented using this hardware. For example, the processor 1001 may also be implemented using at least one of these hardware components.

[0301] (Variant example)

[0302] Moreover, for the terms described in this disclosure and the terms required for understanding this disclosure, they may also be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may also be replaced with each other. Additionally, a signal may also be a message. The Reference Signal can also be abbreviated as RS and may also be referred to as a Pilot, a pilot signal, etc. according to the applied standard. Furthermore, a Component Carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0303] A radio frame may also be constituted by one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, a subframe may also be constituted by one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) independent of the numerology.

[0304] Here, the parameter set may also refer to communication parameters 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 subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering process performed by the transmitter-receiver in the frequency domain, specific windowing process performed by the transmitter-receiver in the time domain, etc.

[0305] A time slot may also be composed of one or more symbols (such as orthogonal frequency division multiplexing (OFDM) symbols, single carrier frequency division multiple access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on the parameter set.

[0306] A time slot may also contain 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 a smaller number of symbols than a time slot. The PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as PDSCH (PUSCH) mapping type B.

[0307] A radio frame, a sub-frame, a time slot, a mini-slot, and a symbol all represent time units for transmitting signals. A radio frame, a sub-frame, a time slot, a mini-slot, and a symbol may also use their respective other names. In addition, the time units such as frames, sub-frames, time slots, mini-slots, symbols, etc. in the present disclosure may also be replaced with each other.

[0308] For example, a sub-frame may also be referred to as a TTI, multiple consecutive sub-frames may also be referred to as a TTI, a time slot or a mini-slot may also be referred to as a TTI. That is, at least one of a sub-frame and a TTI may be a sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (for example, 1 - 13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may not be referred to as a sub-frame, but as a time slot, a mini-slot, etc.

[0309] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used in each user terminal) to each user terminal in units of TTI. Additionally, the definition of the TTI is not limited to this.

[0310] The TTI can also be the transmission time unit for data packets (transport blocks), code blocks, codewords, etc. that have undergone channel coding, and can also become the processing unit for scheduling, link adaptation, etc. Additionally, when the TTI is given, the time interval (e.g., the number of symbols) in which the transport block, code block, codeword, etc. are actually mapped can also be shorter than the TTI.

[0311] Additionally, when one time slot or one mini time slot is referred to as the TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) can also become the minimum time unit for scheduling. Furthermore, the number of time slots (mini time slot numbers) that make up the minimum time unit of this scheduling can also be controlled.

[0312] The TTI with a time length of 1 ms can also be referred to as the normal TTI (TTI in 3GPP Rel.8 - 12), standard TTI, long TTI, normal subframe, standard subframe, long subframe, time slot, etc. The TTI shorter than the normal TTI can also be referred to as the shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, mini time slot, sub - time slot, time slot, etc.

[0313] Additionally, the long TTI (e.g., the normal TTI, subframe, etc.) can also be replaced with a TTI having a time length exceeding 1 ms, and the short TTI (e.g., the shortened TTI, etc.) can also be replaced with a TTI having a TTI length less than the long TTI and a TTI length of 1 ms or more.

[0314] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and can also include one or more consecutive sub - carriers (sub - carriers) in the frequency domain. The number of sub - carriers included in the RB can be the same regardless of the parameter set, for example, it can be 12. The number of sub - carriers included in the RB can also be determined based on the parameter set.

[0315] Furthermore, the RB can also include one or more symbols in the time domain, and can also be the length of one time slot, one mini time slot, one subframe, or one TTI. One TTI, one subframe, etc. can also be composed of one or more resource blocks respectively.

[0316] In addition, one or more RBs may also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0317] Furthermore, a resource block may also be composed of one or more Resource Elements (REs). For example, one RE may also be a wireless resource region of a sub-carrier and a symbol.

[0318] A Bandwidth Part (BWP) (which may also be referred to as a partial bandwidth, etc.) may also represent a subset of consecutive common RBs (common resource blocks) used for a certain parameter set in a certain carrier. Here, the common RBs may also be determined by the indexes of the RBs based on the common reference point of the carrier. A PRB may also be defined in a certain BWP and be sequentially numbered within that BWP.

[0319] A BWP may also include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may also be set within a carrier.

[0320] At least one of the set BWPs may also be active, and the UE may not assume to transmit and receive specific channels / signals outside the active BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced with "BWP".

[0321] In addition, the above structures such as radio frames, sub-frames, time slots, mini time slots, and symbols are merely examples. For example, the number of sub-frames included in a radio frame, the number of time slots in each sub-frame or radio frame, the number of mini time slots included in a time slot, the symbols and the number of RBs included in a time slot or mini time slot, the number of sub-carriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be changed in various ways.

[0322] Furthermore, the information, parameters, etc. described in the present disclosure may be represented by absolute values, may also be represented by relative values with respect to a specific value, and may also be represented by corresponding other information. For example, a radio resource may also be indicated by a specific index.

[0323] In the present disclosure, the names used for parameters and the like are not limiting names in all respects. Furthermore, mathematical expressions and the like using these parameters may also be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name. Therefore, the various names assigned to these various channels and information elements are not limiting names in all respects.

[0324] The information, signals, etc. described in the present disclosure can also be represented using any one of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be mentioned throughout the above description, can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0325] In addition, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0326] The information, signals, etc. that are input and output can be stored in a specific location (e.g., a memory), or can be managed using a management table. The information, signals, etc. that are input and output can be overwritten, updated, or appended. The information, signals, etc. that are output can also be deleted. The information, signals, etc. that are input can also be sent to other devices.

[0327] The notification of information is not limited to the methods / embodiments described in the present disclosure, and other methods can also be used. For example, the notification of information in the present disclosure can also be implemented by physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0328] In addition, physical layer signaling may also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC Connection Setup message, an RRC Connection Reconfiguration (RRC Connection Re-setting) message, etc. In addition, MAC signaling may also be notified, for example, using a MAC Control Element (MAC CE).

[0329] In addition, the notification of specific information (e.g., the notification of "is X") is not limited to explicit notification, and may also be performed implicitly (e.g., by not performing the notification of the specific information, or by the notification of other information).

[0330] The determination can be made by a value represented by one bit (0 or 1), by a true / false value (Boolean value) represented by true or false, or by a numerical comparison (e.g., comparison with a specific value).

[0331] Software, whether referred to as software, firmware, middleware, micro-code, hardware description language, or by any other name, should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, processes, functions, etc.

[0332] In addition, software, instructions, information, etc. can also be sent and received via a transmission medium. For example, in the case of sending software from a website, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included in the definition of the transmission medium.

[0333] Terms such as "system" and "network" used in the present disclosure can be used interchangeably. A "network" can also mean a device included in the network (e.g., a base station).

[0334] 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", "panel", etc. can be used interchangeably.

[0335] In the present disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. can be used interchangeably. There are also cases where a base station is referred to using terms such as macro cell, small cell, femto cell, pico cell, etc.

[0336] The base station can accommodate one or more (e.g., three) cells. In the case where the base station accommodates multiple cells, the overall coverage area of the base station can be divided into multiple smaller areas, and each of the smaller areas can also provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services within the coverage range.

[0337] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" can be used interchangeably.

[0338] There are also cases where the mobile station is referred to by subscriber station, mobile unit, subscriber unit, radio unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client, or several other appropriate terms.

[0339] At least one of the base station and the mobile station can also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station can be a device mounted on a moving body, the moving body itself, etc. The moving body can be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or non-humanoid). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station can also be an Internet of Things (IoT) device such as a sensor.

[0340] In addition, the base station in the present disclosure can also be replaced by a user terminal. For example, for a structure in which communication between a base station and a user terminal is replaced by communication between multiple user terminals (for example, it can also be referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), the various methods / embodiments of the present disclosure can also be applied. In this case, it can also be configured such that the user terminal 20 has the functions of the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to inter-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. can also be replaced by a side channel.

[0341] Similarly, the user terminal in the present disclosure can also be replaced by a base station. In this case, it can also be configured such that the base station 10 has the functions of the above-mentioned user terminal 20.

[0342] In the present disclosure, operations performed by a base station sometimes may also be performed by its upper node according to circumstances. Obviously, in a network including one or more network nodes having a base station, various operations for communicating with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0343] The various methods / embodiments described in the present disclosure can be used alone, in combination, or switched during execution. In addition, the processing procedures, sequences, flowcharts, etc. of the various methods / embodiments described in the present disclosure can also be reordered as long as there is no contradiction. For example, for the methods described in the present disclosure, elements of various steps are presented in an exemplary order, but are not limited to the specific order presented.

[0344] Each mode / embodiment described in the present disclosure can also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER3G, IMT-Advanced, the fourth generation mobile communication system (4G), the fifth generation mobile communication system (5G), the sixth generation mobile communication system (6G), the xth generation mobile communication system (xG) (where x is, for example, an integer or a decimal), Future Radio Access (FRA), New Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, next-generation systems extended based on them, etc. In addition, multiple systems can also be combined (for example, a combination of LTE or LTE-A and 5G) for application.

[0345] The description "based on" used in the present disclosure does not mean "only based on" unless otherwise specified. In other words, the description "based on" means both "only based on" and "at least based on".

[0346] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not comprehensively define the quantity or order of these elements. These terms can be used in this disclosure as a convenient method for distinguishing between more than two elements. Therefore, the reference to the first and second elements does not mean that only two elements can be adopted, or that the first element must be prior to the second element in a certain form.

[0347] The term "determining" used in this disclosure may involve various operations in some cases. For example, "determining" may also be a case where judging, calculating, computing, processing, deriving, investigating, looking up (searching, inquiry) (such as searching in a table, database or other data structures), ascertaining, etc. are regarded as performing "determining".

[0348] In addition, "determining" may also be a case where receiving (for example, receiving information), transmitting (for example, transmitting information), input, output, accessing (for example, accessing data in a memory), etc. are regarded as performing "determining".

[0349] In addition, "determining" may also be a case where resolving, selecting, choosing, establishing, comparing, etc. are regarded as performing "determining". That is, "determining" may also be a case where some actions are regarded as performing "determining".

[0350] In addition, "determining" may also be replaced by "assuming", "expecting", "considering", etc.

[0351] As used in the present disclosure, the terms "connected", "coupled", or any variations thereof, refer to all direct or indirect connections or couplings between two or more elements, and can include the case where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" can also be replaced with "access".

[0352] In the present disclosure, when two elements are connected, it is possible to consider using one or more wires, cables, printed electrical connections, etc., and electromagnetic energy having wavelengths in the radio frequency domain, microwave region, optical (both visible and invisible) region, etc., as several non-limiting and non-exhaustive examples, to be "connected" or "coupled" to each other.

[0353] In the present disclosure, the term "A is different from B" can also mean "A and B are different from each other". Additionally, this term can also mean "A and B are each different from C". Terms such as "separated", "combined", etc. can be interpreted in the same way as "different".

[0354] When the terms "include", "including", and their variations are used in the present disclosure, these terms, like the term "comprising", have an inclusive meaning. Further, the term "or" used in the present disclosure does not mean exclusive or.

[0355] In the present disclosure, for example, in the case where articles are added through translation such as a, an, and the in English, the present disclosure can also include the case where the nouns following these articles are in the plural form.

[0356] Above, the invention related to the present disclosure has been described in detail, but for those skilled in the art, the invention related to the present disclosure is clearly not limited to the embodiments described in the present disclosure. The invention related to the present disclosure can be implemented in the form of modifications and changes without departing from the gist and scope of the invention determined based on the description in the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not carry any restrictive meaning with respect to the invention related to the present disclosure.

Claims

1. A terminal, comprising: A control unit that, when spatial relation information cannot be utilized, determines to use different transmission setting indication TCI states for the transmission opportunities included in the repeated transmission of the physical uplink control channel (PUCCH); and A transmission unit that performs the repeated transmission of the PUCCH, The TCI states for the repeated transmission of the PUCCH are included in a plurality of TCI states activated by a media access control control element (MAC CE).

2. A wireless communication method for a terminal, comprising: A step of determining to use different transmission setting indication TCI states for the transmission opportunities included in the repeated transmission of the PUCCH when spatial relation information cannot be utilized; and A step of performing the repeated transmission of the PUCCH, The TCI states for the repeated transmission of the PUCCH are included in a plurality of TCI states activated by a MAC CE.

3. A base station, comprising: A transmission unit that, when spatial relation information cannot be utilized, transmits information to a terminal, the information being used to determine to use different transmission setting indication TCI states for the transmission opportunities included in the repeated transmission of the PUCCH; and A reception unit that receives the repeated transmission of the PUCCH, The TCI states for the repeated transmission of the PUCCH are included in a plurality of TCI states activated by a MAC CE.

4. A system comprising a terminal and a base station, The terminal comprises: A control unit that, when spatial relation information cannot be utilized, determines to use different transmission setting indication TCI states for the transmission opportunities included in the repeated transmission of the PUCCH; and A transmission unit that performs the repeated transmission of the PUCCH, The TCI states for the repeated transmission of the PUCCH are included in a plurality of TCI states activated by a MAC CE, The base station comprises: A transmission unit that transmits information for determining the TCI state to the terminal; and A reception unit that receives the repeated transmission of the PUCCH.

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