Terminal, wireless communication method, base station and system

Abstract

A terminal according to one embodiment of the present disclosure has: a reception unit that receives downlink control information including information that relates to repeated transmissions of an uplink shared channel (PUSCH); and a control unit that, on the basis of the downlink control information, determines at least one of the number of transmission / reception points performing the repeated transmissions of the PUSCH, and the transmission / reception point or sounding reference signal resource indicator (SRI) corresponding to each PUSCH transmission among the repeated transmissions of the PUSCH.

Description

[Technical Field]

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

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

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later) are also being considered. [Prior art documents] [Non-patent literature]

[0004] [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 [Problem to be solved by the invention]

[0005] 3GPP Rel. 15 supports repeated transmission of UL data channels (e.g., Physical Uplink Shared Channel (PUSCH)). The UE controls the transmission of multiple PUSCHs based on a repetition factor K set by the network (e.g., a base station).

[0006] On the other hand, in Rel. 17 (or Beyond-5G, 6G) and later, it is being considered to carry out communication using one transmission / reception point (TRP) or multiple TRPs.

[0007] However, in the previous NR specifications, how to control the repeated transmission of the UL channel in one TRP (e.g., single TRP) and multiple TRPs (e.g., multi-TRP) has not been fully considered. If the repeated transmission of the PUSCH in single TRP / multi-TRP is not performed appropriately, there is a risk of a decrease in throughput or degradation of communication quality.

[0008] Therefore, the present disclosure provides a terminal and a wireless communication method that can appropriately control PUSCH transmission even when single TRP / multiple TRP is applied. 、 base station and systems One of the aims is to provide [Means for solving the problem]

[0009] A terminal according to an embodiment of the present disclosure is configured to repeatedly transmit a physical uplink shared channel (PUSCH). Multiple sounding reference signal resource sets for of Upper layer parameters to be set a receiving unit that receives the ,under Based on the control information Zu It ,before The PUSCHs are repeatedly transmitted in the same manner as in the previous embodiment. RusaRounding Reference Signal Resource Indicator (SRI )of a control unit that determines A terminal, in which repeated transmission of a PUSCH is associated with each of a plurality of sounding reference signal resource sets. . [Effects of the Invention]

[0010] According to one aspect of the present disclosure, PUSCH transmission can be appropriately controlled even when single TRP / multiple TRP is applied. [Brief explanation of the drawings]

[0011] [Figure 1] 1A and 1B are diagrams illustrating an example of repeated transmission of a PUSCH. [Figure 2] FIG. 2 is a diagram illustrating an example of repeated transmission of PUSCH in multi-TRP. [Figure 3] 3A to 3C are diagrams illustrating examples of a single PUSCH transmission, repeated transmission of a PUSCH for a single TRP, and repeated transmission of a PUSCH for multiple TRPs. [Figure 4] FIG. 4 is a diagram illustrating an example of switching between repeat transmission of a PUSCH for a single TRP and repeat transmission of a PUSCH for multiple TRPs. [Figure 5] 5A and 5B are diagrams illustrating an example of a specific DCI field according to the first embodiment. [Figure 6] 6A and 6B are diagrams showing an example of the correspondence between a plurality of SRIs and a plurality of repeated transmissions. [Figure 7] 7A and 7B are diagrams showing an example of the association between an SRS resource set / SRS resource and a CORESET pool index. [Figure 8] FIG. 8 is a diagram illustrating an example of the association between an SRS resource and a CORESET pool index. [Figure 9] 9A and 9B are diagrams illustrating examples of SRS resource sets / SRS resources corresponding to the first SRS resource set / second SRS resource set, respectively. [Figure 10]10A and 10B are diagrams showing other examples of SRS resource sets / SRS resources corresponding to the first SRS resource set / second SRS resource set, respectively. [Figure 11] FIG. 11 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 12] FIG. 12 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 13] FIG. 13 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 14] FIG. 14 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] (Repeated transmission) Rel. 15 supports repeated transmission in data transmission. For example, a base station (network (NW), gNB) repeats transmission of DL data (e.g., downlink shared channel (PDSCH)) a predetermined number of times. Alternatively, a UE repeats transmission of UL data (e.g., uplink shared channel (PUSCH)) a predetermined number of times.

[0013] 1A is a diagram illustrating an example of repeated transmission of a PUSCH. In FIG. 1A, an example is shown in which a predetermined number of repeated PUSCHs are scheduled by a single DCI. The number of repetitions is also called a repetition factor K or an aggregation factor K.

[0014] In FIG. 1A, the repetition factor K=4, but the value of K is not limited to this. Also, the nth repetition may be called the nth transmission occasion or the like, and may be identified by a repetition index k (0≦k≦K−1). Also, FIG. 1A shows repeated transmission of a PUSCH dynamically scheduled by DCI (e.g., a dynamic grant-based PUSCH), but may also be applied to repeated transmission of a configuration grant-based PUSCH.

[0015] For example, in Figure 1A, the UE semi-statically receives information indicating the repetition factor K (e.g., aggregationFactorUL or aggregationFactorDL) through higher layer signaling, where the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0016] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), etc.

[0017] The UE controls reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) of the PDSCH or transmission processing (e.g., at least one of transmission, mapping, modulation, and coding) of the PUSCH for K consecutive slots based on at least one of the following field values (or information indicated by the field value) in the DCI: Allocation of time domain resources (e.g., starting symbol, number of symbols in each slot, etc.), Allocation of frequency domain resources (e.g., a predetermined number of resource blocks (RBs) and a predetermined number of resource block groups (RBGs)), Modulation and Coding Scheme (MCS) index, Configuration of the PUSCH demodulation reference signal (DMRS: Demodulation Reference Signal), PUSCH spatial relation info or Transmission Configuration Indication (TCI) state (TCI-state).

[0018] The same symbol allocation may be applied to K consecutive slots. Figure 1A shows a case where the PUSCH in each slot is allocated to a predetermined number of symbols from the beginning of the slot. The same symbol allocation between slots may be determined as described above in the time domain resource allocation.

[0019] For example, the UE may determine the symbol allocation in each slot based on the start symbol S and the number of symbols L (e.g., Start and Length Indicator (SLIV)) determined based on the value m of a predetermined field (e.g., the TDRA field) in the DCI. Note that the UE may determine the first slot based on K2 information determined based on the value m of a predetermined field (e.g., the TDRA field) in the DCI.

[0020] On the other hand, among the K consecutive slots, the redundancy versions (RVs) applied to TBs based on the same data may be the same or at least partially different. For example, the RV applied to the TB in the n-th slot (transmission opportunity, repetition) may be determined based on the value of a predetermined field (e.g., RV field) in the DCI.

[0021] If the communication direction of the resources allocated in K consecutive slots differs in at least one symbol from the UL, DL, or Flexible of each slot specified by at least one of the uplink / downlink communication direction indication information for TDD control (e.g., "TDD-UL-DL-ConfigCommon" or "TDD-UL-DL-ConfigDedicated" in the RRC IE) and the slot format indicator of the DCI (e.g., DCI format 2_0), the resources of the slot containing that symbol may not be transmitted (or received).

[0022] In Rel. 15, as shown in FIG. 1A, PUSCH is repeatedly transmitted across multiple slots (slot units), but in Rel. 16 and later, it is expected that PUSCH will be repeatedly transmitted in units shorter than slots (for example, subslot units, minislot units, or units of a predetermined number of symbols) (see FIG. 1B).

[0023] In FIG. 1B, the repetition factor K=4, but the value of K is not limited to this. Also, the nth repetition may be called the nth transmission occasion or the like, and may be identified by a repetition index k (0≦k≦K−1). Also, while FIG. 1B shows repeated transmission of a PUSCH dynamically scheduled by DCI (e.g., a dynamic grant-based PUSCH), this may also be applied to repeated transmission of a configuration grant-based PUSCH.

[0024] The UE may determine symbol allocation for PUSCH transmission (e.g., PUSCH with k=0) in a predetermined slot based on a start symbol S and the number of symbols L (e.g., StartSymbol and length) determined based on a value m of a predetermined field (e.g., a TDRA field) in DCI of the PUSCH. Note that the UE may determine the predetermined slot based on Ks information determined based on the value m of a predetermined field (e.g., a TDRA field) of DCI.

[0025] The UE may dynamically receive information indicating the repetition factor K (e.g., number of repetitions) via downlink control information. The repetition factor may be determined based on the value m of a predetermined field (e.g., the TDRA field) in the DCI. For example, a table may be supported that defines the correspondence between the bit value notified by the DCI, the repetition factor K, the start symbol S, and the number of symbols L.

[0026] The slot-based repetitive transmission shown in FIG. 1A may be referred to as repetitive transmission type A (e.g., PUSCH repetition Type A), and the subslot-based repetitive transmission shown in FIG. 1B may be referred to as repetitive transmission type B (e.g., PUSCH repetition Type B).

[0027] The UE may be configured to apply at least one of repetitive transmission type A and repetitive transmission type B. For example, the base station may notify the UE of the repetitive transmission type applied by the UE by higher layer signaling (e.g., PUSCHRepTypeIndicator).

[0028] Either repetitive transmission type A or repetitive transmission type B may be configured in the UE for each DCI format that schedules the PUSCH.

[0029] For example, for a first DCI format (e.g., DCI format 0_1), if higher layer signaling (e.g., PUSCHRepTypeIndicator-AorDCIFormat0_1) is set to repetitive transmission type B (e.g., PUSCH-RepTypeB), the UE applies repetitive transmission type B for PUSCH repetitive transmissions scheduled in the first DCI format. Otherwise (e.g., if PUSCH-RepTypeB is not set or if PUSCH-RepTypA is set), the UE applies repetitive transmission type A for PUSCH repetitive transmissions scheduled in the first DCI format.

[0030] Furthermore, in Rel. 16 and later, dynamic switching between single PUSCH transmission and repeated PUSCH transmission is being considered.

[0031] When a higher layer parameter related to time domain allocation of a PUSCH (e.g., pusch-TimeDomainAllocationListDCI-0-1-r16 or pusch-TimeDomainAllocationListDCI-0-2-r16) is configured for a UE, a parameter related to the number of PUSCH repetitions (e.g., numberOfRepetitions-r16) included in the higher layer parameter may set the number of repetitions (e.g., 1, 2, 3, 4, 7, 8, 12, or 16). The UE may determine the number of PUSCH repetitions scheduled by the DCI based on the time domain resource allocation field of the DCI. When the number of repetitions is set / specified to 1, the UE may perform a single PUSCH transmission.

[0032] (Spatial relations for SRS, PUSCH) In Rel.15 NR, a UE may receive information (SRS configuration information, for example, parameters in the RRC control element "SRS-Config") used to transmit a measurement reference signal (e.g., a Sounding Reference Signal (SRS)).

[0033] Specifically, the UE may receive at least one of information about one or more SRS resource sets (SRS resource set information, e.g., the RRC control element "SRS-ResourceSet") and information about one or more SRS resources (SRS resource information, e.g., the RRC control element "SRS-Resource").

[0034] An SRS resource set may be associated with (group together) a predetermined number (e.g., one or more) of SRS resources, each of which may be identified by an SRS Resource Indicator (SRI) or SRS Resource Identifier (ID).

[0035] The SRS resource set information may include an SRS resource set ID (SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, an SRS resource type (e.g., periodic SRS, semi-persistent SRS, or aperiodic SRS), and information on SRS usage.

[0036] Here, the SRS resource type may indicate any one of periodic SRS (P-SRS), semi-persistent SRS (SP-SRS), and aperiodic SRS (A-SRS). Note that the UE may transmit P-SRS and SP-SRS periodically (or periodically after activation) and transmit A-SRS based on an SRS request in the DCI.

[0037] Furthermore, the use ("usage" of the RRC parameter, "SRS-SetUse" of the L1 (Layer-1) parameter) may be, for example, beam management, codebook (CB), non-codebook (NCB), antenna switching, etc. The SRS for codebook (CB) or non-codebook (NCB) use may be used to determine a codebook-based or non-codebook-based precoder for PUSCH transmission based on the SRI.

[0038] For example, the UE may determine a precoder for PUSCH transmission based on the SRI, a Transmitted Rank Indicator (TRI), and a Transmitted Precoding Matrix Indicator (TPMI) in the case of codebook-based transmission. The UE may determine a precoder for PUSCH transmission based on the SRI in the case of non-codebook-based transmission.

[0039] The SRS resource information may include an SRS resource ID (SRS-ResourceId), an SRS port number, an SRS port number, a transmission comb, an SRS resource mapping (e.g., time and / or frequency resource position, resource offset, resource period, number of repetitions, number of SRS symbols, SRS bandwidth, etc.), hopping-related information, an SRS resource type, a sequence ID, spatial relationship information of the SRS, etc.

[0040] The spatial relationship information of the SRS (e.g., the RRC information element "spatialRelationInfo") may indicate spatial relationship information between a predetermined reference signal and the SRS. The predetermined reference signal may be at least one of a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Channel State Information Reference Signal (CSI-RS), and an SRS (e.g., another SRS). The SS / PBCH block may be referred to as a Synchronization Signal Block (SSB).

[0041] The spatial relationship information of the SRS may include at least one of an SSB index, a CSI-RS resource ID, and an SRS resource ID as an index of the predetermined reference signal.

[0042] In the present disclosure, the SSB index, SSB resource ID, and SSB resource indicator (SSBRI) may be interchangeable. Also, the CSI-RS index, CSI-RS resource ID, and CSI-RS resource indicator (CRI) may be interchangeable. Also, the SRS index, SRS resource ID, and SRI may be interchangeable.

[0043] The spatial relationship information of the SRS may include a serving cell index, a BWP index (BWP ID), etc. corresponding to the predetermined reference signal.

[0044] When the UE is configured with spatial relationship information regarding an SSB or CSI-RS and an SRS for a certain SRS resource, the UE may transmit the SRS resource using the same spatial domain filter (spatial domain transmit filter) as the spatial domain filter for receiving the SSB or CSI-RS (spatial domain receive filter). In this case, the UE may assume that the UE receive beam for the SSB or CSI-RS and the UE transmit beam for the SRS are the same.

[0045] When spatial relationship information regarding a certain SRS (target SRS) resource is configured between another SRS (reference SRS) and the SRS (target SRS), the UE may transmit the target SRS resource using the same spatial domain filter (spatial domain transmit filter) as the spatial domain filter (spatial domain transmit filter) for transmitting the reference SRS. That is, in this case, the UE may assume that the UE transmit beam of the reference SRS and the UE transmit beam of the target SRS are the same.

[0046] The UE may determine the spatial relationship of the PUSCH scheduled by the DCI (e.g., DCI format 0_1) based on the value of a predetermined field (e.g., an SRS resource identifier (SRI) field). Specifically, the UE may use spatial relationship information of the SRS resource (e.g., the RRC information element "spatialRelationInfo") determined based on the value of the predetermined field (e.g., the SRI) for PUSCH transmission.

[0047] When codebook-based transmission is used for the PUSCH, the UE may be configured by RRC with two SRS resources per SRS resource set, and one of the two SRS resources may be indicated by DCI (a 1-bit SRI field).When non-codebook-based transmission is used for the PUSCH, the UE may be configured by RRC with four SRS resources per SRS resource set, and one of the four SRS resources may be indicated by DCI (a 2-bit SRI field).

[0048] (TPMI and transmission rank) In Rel. 16, it is considered that the Transmitted Precoding Matrix Indicator (TPMI) and transmission rank for codebook-based PUSCH transmission will be specified by specific fields (e.g., precoding information and number of layers fields) included in downlink control information (e.g., DCI format 0_1).

[0049] The precoder used by the UE for codebook-based PUSCH transmission may be selected from an uplink codebook with a number of antenna ports equal to the value configured in the higher layer parameter configured for the SRS resources (e.g., nrofSRS-Ports).

[0050] The size (number of bits) of this particular field is variable depending on the number of antenna ports for PUSCH (for example, the number of ports indicated by the above nrofSRS-Ports) and some higher layer parameters.

[0051] The particular field may be a 0 bit if the higher layer parameters (eg, txConfig) configured for the UE are set to non-codebook.

[0052] Furthermore, the particular field may be a 0 bit when a higher layer parameter (eg, txConfig) configured for the UE for one antenna port is set to a codebook.

[0053] Furthermore, for four antenna ports, when an upper layer parameter (e.g., txConfig) configured for the UE is set to a codebook, the specific field may have a bit length of 2 to 6 bits based on at least one of another upper layer parameter configured for the UE and the presence or absence (enabled or disabled) of a transform precoder.

[0054] Furthermore, for two antenna ports, when an upper layer parameter (e.g., txConfig) configured for the UE is set to a codebook, the specific field may have a bit length of 1 to 4 bits based on at least one of another upper layer parameter configured for the UE and the presence or absence (enabled or disabled) of a transform precoder.

[0055] The other upper layer parameter may be at least one of a parameter for specifying a full power transmission mode of UL (e.g., ul-FullPowerTransmission), a parameter indicating the maximum value of the transmission rank of UL (e.g., maxRank), a parameter indicating a subset of a certain precoding matrix indicator (PMI) (e.g., codebookSubset), and a parameter for specifying a transform precoder (e.g., transformPrecoder).

[0056] (Multi-TRP) In NR, one or more Transmission / Reception Points (TRPs) (multi-TRP) will perform DL transmission to a UE using one or more panels (multi-panel), and a UE will perform UL transmission to one or more TRPs (see Figure 2).

[0057] Multiple TRPs may correspond to the same cell identifier (ID), or to different cell IDs, which may be physical or virtual cell IDs.

[0058] 3A to 3C are diagrams illustrating examples of single PUSCH transmission, repeated PUSCH transmission for a single TRP, and repeated PUSCH transmission for multiple TRPs. In the example illustrated in FIG. 3A, the UE performs single PUSCH transmission using a first SRI determined from a first SRI field. In the example illustrated in FIG. 3B, the UE performs repeated PUSCH transmission for a single TRP using a first SRI determined from a first SRI field. In the example illustrated in FIG. 3C, the UE performs repeated PUSCH transmission for multiple TRPs using a first SRI determined from a first SRI field and a second SRI determined from a second SRI field. Schedule control for the repeated PUSCH transmission may be based on one DCI.

[0059] In NR Rel. 16 and later, dynamic switching between single PUSCH transmission / repeated transmission of PUSCH for a single TRP and repeated transmission of PUSCH for multiple (e.g., two) TRPs is being considered (see Figure 4). Figure 4 shows an example of dynamic switching (or changeover) between repeated transmission of PUSCH for a single TRP with four repetitions (S-TRP repetition) and repeated transmission of PUSCH for multiple TRPs with four repetitions (M-TRP repetition).

[0060] In the previous NR specifications, there has been insufficient consideration of how to control dynamic switching between single PUSCH transmission / repeated transmission of PUSCH for a single TRP and repeated transmission of PUSCH for multiple TRPs.

[0061] Furthermore, when applying a single PUSCH transmission / repeated transmission of a PUSCH for a single TRP, or when applying repeated transmission of a PUSCH for multiple TRPs, there has not been sufficient consideration as to how to control the transmission of a reference signal (e.g., SRS) corresponding to the PUSCH transmission.

[0062] If repeated transmission of the PUSCH (or transmission of a reference signal corresponding to PUSCH transmission) is not performed appropriately, there is a risk that throughput will decrease or communication quality will deteriorate.

[0063] The present inventors have studied repeated transmission of PUSCH (or transmission of reference signals corresponding to PUSCH transmission) when single TRP / multiple TRP is applied, and have conceived the present embodiment.

[0064] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0065] In the present disclosure, the terms port, panel, beam, uplink (UL) transmitting entity, TRP, spatial relationship information (SRI), spatial relationship, control resource set (CORESET), PDSCH, codeword, base station, predetermined antenna port (e.g., demodulation reference signal (DMRS) port), predetermined antenna port group (e.g., DMRS port group), predetermined group (e.g., code division multiplexing (CDM) group, predetermined reference signal group, CORESET group, panel group, beam group, spatial relationship group, PUCCH group), and CORESET pool may be interchangeable. Also, panel identifier (ID) and panel may be interchangeable. TRP ID and TRP may be interchangeable.

[0066] In the present disclosure, the terms index, ID, indicator, and resource ID may be read interchangeably.

[0067] In the present disclosure, "A / B" may mean "at least one of A and B." Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0068] In the present disclosure, terms such as list, group, cluster, and subset may be interchangeable. In the present disclosure, terms such as spatial relation information (SRI), SRS resource indicator (SRI, or SRI field), SRS resource, SRS resource set, and precoder may be interchangeable.

[0069] In the present disclosure, spatial relationship information (SRI), SRI combination, SRI for codebook-based transmission, non-codebook-based SRI combination, spatialRelationInfo, UL TCI, TCI state, Unified TCI, QCL, etc. may be read interchangeably.

[0070] In the present disclosure, the first TRP and the second TRP may be interchangeably read as the first PUSCH and the second PUSCH, the first PUSCH transmission opportunity and the second PUSCH transmission opportunity, the first SRI and the second SRI, etc.

[0071] In the following embodiments, repeated transmission of PUSCHs for multiple TRPs may be interchangeably referred to as PUSCHs across multiple TRPs, repeated PUSCHs across multiple TRPs, simply repeated PUSCHs, repeated transmissions, multiple PUSCH transmissions, etc. Also, a single PUSCH transmission for a single TRP may be simply referred to as a single PUSCH transmission, PUSCH transmission in a single TRP, etc.

[0072] In this disclosure, repeated transmission of a PUSCH for a single TRP may mean repeated transmission of multiple PUSCHs transmitted using the same SRI / beam / precoder.

[0073] In the present disclosure, repeated transmission of PUSCHs for multiple TRPs may refer to repeated transmission of multiple PUSCHs transmitted using different SRIs / beams / precoders. The repeated transmission and the multiple SRIs / beams / precoders may correspond cyclically, sequentially by a specific number, or using a half-half pattern (mapping), as detailed in the above mapping pattern.

[0074] In addition, in each embodiment of the present disclosure, the case where the number of TRPs, SRIs, etc. is two is mainly described as an example, but these numbers may be three or more. Furthermore, the term "dynamic switch" in the present disclosure may mean "a switch that uses at least one of higher layer signaling and physical layer signaling." Furthermore, the term "switch" in the present disclosure may be read interchangeably as switching, change, changing, application, etc.

[0075] Furthermore, each embodiment of the present disclosure can be applied to repeated transmission of any UL signal / channel for multiple TRPs, and the PUSCH in the present disclosure can be read as any UL signal / channel. For example, each embodiment of the present disclosure can be applied to repeated transmission of PUCCH for multiple TRPs, and the PUSCH in the present disclosure can be read as PUCCH.

[0076] In the present disclosure, a first TRP (e.g., TRP#1) and a second TRP (e.g., TRP#2) have a first spatial relationship (e.g., 1 stThe first TRP (e.g., TRP#1) and the second TRP (e.g., TRP#2) may correspond to a spatial relation / beam / UL TCI / QCL associated with the first SRI field or the first TPMI field and a spatial relation / beam / UL TCI / QCL associated with the second SRI field or the second TPMI field, respectively. Alternatively, the first TRP (e.g., TRP#1) and the second TRP (e.g., TRP#2) may correspond to a first SRS resource set with usage CB / NCB (e.g., usage=CB / NCB) and a second SRS resource set with usage CB / NCB (e.g., usage=CB / NCB), respectively.

[0077] (Wireless communication method) First Embodiment In the first embodiment, based on a specific field included in the DCI, it is notified that either repeated transmission for a single TRP or repeated transmission for multiple TRPs is to be performed. Repeated transmission for a single TRP may be interpreted as single PUSCH transmission.

[0078] The UE may determine whether to perform repeated transmission for a single TRP or repeated transmission for multiple TRPs based on a specific field included in the DCI (or a specific DCI field).The UE may also determine the TRP (or the SRS resource / SRS resource set / spatial relationship / beam / UL TCI / QCL used for the PUSCH transmission) corresponding to the DCI (or the specific DCI field).

[0079] The specific DCI field may be a field newly added to the DCI format of an existing system (e.g., Rel. 15). The specific field (or the specific DCI field) may be referred to as, for example, a TRP switching indicator, a multi spatial relation indicator, a beam mapping indicator, a PUSCH repetition indicator, or the like.

[0080] The size (or payload) of a specific DCI field may be a fixed value (Option 1-1), or the size of the specific DCI field may be set to be variable (Option 1-2). The specific DCI field may be included in DCI that schedules a PUSCH to which repeated transmission is applied.

[0081] [Option 1-1] If a specific DCI field is configured with a fixed size (or a fixed DCI payload), the size of the specific DCI field may be defined in a specification. Also, whether a specific DCI field is included in a DCI may be configured by a higher layer (e.g., RRC). A UE may assume that a specific DCI field is included in a DCI if the presence of the specific DCI field is indicated / configured by higher layer signaling.

[0082] When a specific DCI field has one bit, the one bit may indicate whether the repeated transmission is for a single TRP or for multiple TRPs (see FIG. 5A).

[0083] When the specific DCI field is multiple (for example, 2 bits), the 2 bits may indicate whether the repeat transmission is for multiple TRPs, for a single TRP (first TRP#1), or for a single TRP (second TRP#2). In other words, when the repeat transmission is for a single TRP, information about the TRP to which the PUSCH is to be transmitted may be specified by a code point in the specific DCI field. The information about the TRP may be information about the SRS (for example, SRI / SRS resource set / SRS resource) applied / corresponding to the PUSCH transmission.

[0084] If a specific DCI field has two bits, four states can be specified. For example, if a code point in a specific DCI field indicates repeated transmission for multiple TRPs, a TRP / beam mapping pattern may be specified (see FIG. 5B). A mapping pattern may also be called a mapping rule, beam mapping rule, corresponding pattern, corresponding beam pattern, or correspondence relationship.

[0085] For example, the code point of a particular DCI field may indicate whether the repeat transmission is for multiple TRPs using a first mapping pattern, for multiple TRPs using a second mapping pattern, for a single TRP (first TRP#1), or for a single TRP (second TRP#2).

[0086] The mapping pattern may be indicated by an SRI / SRI field / SRS resource / SRS resource set / TRP that is applied to or corresponds to a PUSCH repeated transmission (e.g., each PUSCH transmission). For example, if repeated transmission for multiple TRPs is supported, multiple SRI fields may be signaled / configured to the UE (or multiple SRI fields may be included in the DCI), or multiple SRS resources / SRS resource sets may be signaled / configured.

[0087] Alternatively, one SRI field may be configured in the DCI, and the UE may switch the SRS resource set / SRS resource to be applied for each PUSCH transmission based on the SRI field. For example, the UE may apply a first SRS resource set / SRS resource (corresponding to the first SRI field) to PUSCH #1 and a second SRS resource set / SRS resource (corresponding to the first SRI field) to PUSCH #2.

[0088] As a mapping pattern applied to repeated transmission of PUSCH for multiple TRPs, multiple SRI / SRI fields (hereinafter simply referred to as SRI) may correspond cyclically to multiple repeated transmissions. This mapping pattern may be called cyclical mapping (e.g., cyclical mapping), cyclic pattern, cyclic correspondence, etc.

[0089] 6A is a diagram showing an example in which multiple SRIs correspond to multiple repeated transmissions in a cyclical manner. In FIG. 6A, the UE is specified with a repetition count of 4 and performs repeated PUSCH transmission using a first SRI and a second SRI. In the example shown in FIG. 6A, the UE cyclically performs PUSCH transmission using a first SRI and PUSCH transmission using a second SRI. For example, the first SRI may be applied to odd-numbered repetitions (repetitions #1, #3), and the second SRI may be applied to even-numbered repetitions (repetitions #2, #4) (e.g., SRI#1, SRI#2, SRI#1, SRI#2).

[0090] Alternatively, as a mapping pattern (e.g., a second mapping pattern) to be applied to repeated transmission of PUSCH for multiple TRPs, it may be determined that multiple SRIs (or SRI fields) correspond sequentially to multiple repeated transmissions, with a specific number (e.g., two) of SRIs. This mapping pattern may be called sequential mapping (e.g., sequential pattern), sequential correspondence, etc.

[0091] 6B is a diagram showing an example in which multiple SRIs correspond sequentially to multiple repeated transmissions. In FIG. 6B, the UE is specified with a repetition count of 4 and performs repeated transmission of a PUSCH using a first SRI and a second SRI. In the example shown in FIG. 6B, the UE performs PUSCH transmission using a first SRI and PUSCH transmission using a second SRI sequentially, two times each (e.g., SRI#1, SRI#1, SRI#2, SRI#2).

[0092] The codepoints of the specific DCI fields may indicate to the UE the mapping patterns to be applied when repeated transmissions for multiple TRPs are indicated, for example, a first mapping pattern may be cyclical and a second mapping pattern may be sequential.

[0093] In this way, by using a code point of a specific DCI field to specify a mapping pattern for multiple TRPs when notifying the UE of repeated transmissions for multiple TRPs, it becomes possible to flexibly and dynamically indicate the mapping pattern without adding a new DCI size.

[0094] Variations The mapping pattern (e.g., cyclic mapping or sequential mapping) may be configured in higher layer parameters / MAC CE, and the order of the TRPs (or which SRI / SRI field to start from) may be indicated in the DCI.

[0095] For example, if cyclic mapping is configured by higher layer parameters, a specific DCI field may specify a mapping pattern of {SRI#1, SRI#2, SRI#1, SRI#2} or {SRI#2, SRI#1, SRI#2, SRI#1}.

[0096] If sequential mapping is configured by higher layer parameters, a mapping pattern of {SRI#1, SRI#1, SRI#2, SRI#2} or {SRI#2, SRI#2, SRI#1, SRI#1} may be specified by a specific DCI field.

[0097] [Option 1-2] A specific DCI field may be configured with a configurable / variable size. For example, a specification may define a maximum of X bits (e.g., X=2) as the size of a specific DCI field, and the size of the specific DCI field may be determined based on a configuration / predetermined condition of a higher layer. Furthermore, whether a specific DCI field is included in the DCI may be configured by a higher layer (e.g., RRC). The UE may assume that a specific DCI field is included in the DCI if the presence of the specific DCI field is notified / configured by higher layer signaling.

[0098] When a specific DCI field of one bit is set, the one bit may indicate whether the repeated transmission is for a single TRP or for multiple TRPs (see FIG. 5A).

[0099] When a 2-bit specific DCI field is set, the 2 bits may indicate whether the repeat transmission is for multiple TRPs, for a single TRP (first TRP#1), or for a single TRP (second TRP#2). In other words, when the repeat transmission is for a single TRP, information about the TRP to which the PUSCH is to be transmitted may be specified by a code point in the specific DCI field. The information about the TRP may be information about the SRS (e.g., SRI / SRS resource set / SRS resource) applied / corresponding to the PUSCH transmission.

[0100] If a specific DCI field has two bits, four states can be specified. For example, when a code point in a specific DCI field indicates that a transmission is repeated for multiple TRPs, a mapping pattern for multiple TRPs may be specified (see Figure 5B). The mapping pattern for multiple TRPs may be the same as that shown in Option 1-1 above.

[0101] In this way, when a code point of a specific DCI field is used to notify the UE that a transmission is repeated for multiple TRPs, by specifying a mapping pattern for multiple TRPs, it is possible to flexibly and dynamically indicate the mapping pattern without adding a new DCI size.

[0102] Alternatively, whether the repeat transmission is for a single TRP or for multiple TRPs may be indicated based on the number of bits of a specific DCI field. For example, when a 1-bit specific DCI field is set, it may indicate that the repeat transmission is for a single TRP. In this case, one bit may indicate whether the repeat transmission is for a first TRP or a second TRP. When a 2-bit specific DCI field is set, the 2 bits may indicate whether the repeat transmission is for multiple TRPs, a single TRP (first TRP#1), or a single TRP (second TRP#2). Alternatively, when a 2-bit specific DCI field is set, it may indicate that the repeat transmission is for multiple TRPs, and the 2 bits may be used to specify a mapping pattern.

[0103] <Second embodiment> In the second embodiment, the setting of an SRS resource set / SRS resource will be described.

[0104] Here, we will explain the case where the configuration of multiple SRS resource sets is supported for SRS for codebook (CB) / non-codebook (NCB) use (option 2-1), or where one SRS resource set is configured (option 2-2) as an example, but this is not limited to this.

[0105] The codebook (CB) / non-codebook (NCB) usage may be when a certain higher layer parameter (e.g., usage=CB / NCB) is set.

[0106] [Option 2-1] In the case of usage=CB / NCB (for example, when usage=CB / NCB is set in the SRS resource set information), multiple SRS resource sets may be configured, or the configuration of multiple SRS resource sets may be supported.

[0107] For example, when usage=CB / NCB, a higher layer index may be configured (or associated) with each SRS resource set, and the higher layer index may be at least one of a CORESET pool index and a PUCCH repetition index.

[0108] 7A and 7B show a case where a first SRS resource set ID (e.g., #0) and a second SRS resource set ID (e.g., #1) are set when usage=CB. An index of a higher layer (e.g., CORESET pool index / PUCCH repetition index) may be set for each SRS resource set ID.

[0109] Here, a first CORESET pool index (e.g., #0) is set for a first SRS resource set ID (e.g., #0) (see FIG. 7A), and a second CORESET pool index (e.g., #1) is set for a second SRS resource set ID (e.g., #1) (see FIG. 7B).

[0110] Note that a CORESET pool index may not be set for an SRS resource set ID, in which case the UE may assume that a predetermined CORESET pool index (e.g., #0) corresponds to or is set for the SRS resource set ID.

[0111] Separate SRS resources (e.g., different SRS resources) may be associated with the first SRS resource set ID (e.g., #0) and the second SRS resource set ID (e.g., #1). Here, a case is shown in which two SRR resources (e.g., SRS#0_0 and SRS#0_1) correspond to the first SRS resource set ID (e.g., #0), and two SRR resources (e.g., SRS#1_0 and SRS#1_1) correspond to the second SRS resource set ID (e.g., #1).

[0112] SRS#0_0 may correspond to SRI#0_0 notified by the DCI, and SRS#0_1 may correspond to SRI#0_1 notified by the DCI. SRI#0_0 and SRI#0_1 may each correspond to a predetermined code point in the SRI field. Similarly, SRS#1_0 may correspond to SRI#1_0 notified by the DCI, and SRS#1_1 may correspond to SRI#1_1 notified by the DCI. SRI#1_0 and SRI#1_1 may each correspond to a predetermined code point in the SRI field.

[0113] Alternatively, a higher layer index (e.g., CORESET pool index / PUCCH repetition index) may not be explicitly configured for each SRS resource set, but may be implicitly configured (or associated). For example, a predetermined higher layer index (e.g., CORESET pool index #0 / PUCCH repetition index #0) may be implicitly mapped to the smallest SRS resource set ID (or the smallest SRS resource ID). In other words, a higher layer index may be associated with each SRS resource set in index order.

[0114] In this way, by supporting the configuration of multiple SRS resource sets in which SRS resources can be configured separately, it is possible to suppress an increase in the number of SRS resources included in each SRS resource set, thereby suppressing an increase in the number of bits in the SRI field of the DCI.

[0115] [Option 2-2] When usage=CB / NCB (for example, when usage=CB / NCB is set in the SRS resource set information), one SRS resource set may be configured, or the configuration of the SRS resource set may be limited to one.

[0116] For example, when usage=CB / NCB, a higher layer index may be configured (or associated) for each different SRS resource included in one SRS resource set. The higher layer index may be at least one of a CORESET pool index and a PUCCH repetition index. That is, association of a different CORESET pool index / a different PUCCH repetition index for each different SRS resource included in an SRS resource set may be supported.

[0117] 8 shows a case where, when usage=CB, one SRS resource set ID (e.g., #0) is set and different CORESET pool indexes are associated with multiple SRS resources (at least two SRS resources) included in the SRS resource set ID #0. Here, a first CORESET pool index (e.g., #0) is associated with SRS resources #0_0 and #0_1, and a second CORESET pool index (e.g., #1) is associated with SRS resources #0_2 and #0_3.

[0118] The number of SRS resources associated with an SRS resource set, the correspondence between SRS resources and CORESET pool indexes, etc. are not limited to these.

[0119] Note that a CORESET pool index may not be set for an SRS resource set ID, in which case the UE may assume that a predetermined CORESET pool index (for example, #0) is set for the SRS resource set ID.

[0120] Alternatively, a higher layer index (e.g., CORESET pool index / PUCCH repetition index) may not be explicitly configured for each SRS resource, but may be implicitly configured (or associated) with it. For example, a predetermined higher layer index (e.g., CORESET pool index #0 / PUCCH repetition index #0) may be implicitly mapped to the smallest SRS resource (or two relatively small SRS resources).

[0121] In this way, by using one (or a common) SRS resource set for multiple TRPs, it is possible to suppress an increase in overhead used for notifying the SRS resource set.

[0122] <Third embodiment> In the third embodiment, transmission control will be described in the case where codebook-based (CB based) / non-codebook-based (NCB based) PUSCH repetitive transmission is performed for a single TRP / multiple TRPs.

[0123] Here, it is assumed that configuration of multiple (for example, two) SRS resource sets is supported for codebook-based (CB based) / non-codebook-based (NCB based) PUSCH transmission, but this is not limiting. In the following description, a case will be described in which a first SRR resource set (ID=0) and a second SRS resource set (ID=1) are configured as SRS resource sets.

[0124] [CB-based UL transmission] In the CB-based case, for example, two SRS resources per SRS resource set may be configured in the UE by higher layer signaling, and one of the two SRS resources may be indicated to the UE by DCI (e.g., a 1-bit SRI field).

[0125] In the case of CB-based UL MIMO for PUSCH, a predetermined SRI field / SRS resource set may be applied to repeated transmission for a single TRP and repeated transmission for multiple TRPs. Repeated transmission for a single TRP may be interpreted as a single PUSCH transmission (or when the number of PUSCH repetitions (e.g., repetition number) is 1).

[0126] Repeated transmission for a single TRP When a repeat transmission for a single TRP is indicated, the UE may apply a corresponding SRI field / SRS resource set to each TRP. For example, when a first TRP (e.g., TRP#1) is designated as a repeat transmission for a single TRP, the UE may apply a first SRI field / first SRS resource set to the repeat transmission of the PUSCH.

[0127] The UE may apply the second SRI field / second SRS resource set for repeated transmission of the PUSCH if a second TRP (e.g., TRP#2) is designated as repeated transmission for a single TRP.

[0128] If multiple TPMI fields are supported, the UE may apply a specific TPMI field (e.g., the first TPMI field) because the second TPMI field does not indicate the number of layers.

[0129] Repeated transmission for multiple TRPs When repeated transmission for multiple TRPs is indicated, a beam mapping pattern may be defined / configured / indicated by higher layers (e.g., RRC) / MAC CE / DCI.

[0130] When repeated transmission for multiple TRPs is instructed, multiple (e.g., two) SRI fields / SRS resource sets / TPMI fields may be applied. For example, among repeated transmissions for multiple TRPs, a first SRI field / first SRS resource set may be applied to transmission for TRP#1, and a second SRI field / second SRS resource set may be applied to transmission for TRP#2. Also, a first TPMI field may be applied to transmission for TRP#1, and a second TPMI field may be applied to transmission for TRP#2.

[0131] In this way, the first SRI field / first SRS resource set / first TPMI field is applied to repeated transmission for the first TRP (e.g., TRP#1), and the second SRI field / second SRS resource set / second TPMI field is applied to repeated transmission for the second TRP (e.g., TRP#2), thereby enabling flexible control of transmission for each TRP.

[0132] The mapping between the SRS resource set configured in the higher layer and the first SRS resource set / second SRS resource set may be implicit (e.g., implicit mapping) or explicit (e.g., explicit mapping).

[0133] "Implicit Mapping" The codebook / non-codebook usage, which assumes that an SRS for codebook / non-codebook usage is configured and implicit mapping (e.g., implicit mapping) is applied, may be a case where a predetermined upper layer parameter (e.g., usage=CB / NCB) is configured.

[0134] In this case, the first SRS resource set with usage=CB / NCB (e.g., 1 stThe SRS resource set with usage=CB / NCB may refer to the SRS resource set with the smallest (or largest) SRS resource set ID associated with usage=CB / NCB (see FIG. 9A). nd An SRS resource set with usage=CB / NCB may refer to the SRS resource set with the second smallest (or second largest) SRS resource set ID associated with usage=CB / NCB (see FIG. 9B).

[0135] 9A shows a case where the first SRS resource set corresponds to the smallest SRS resource set ID (here, SRS resource set ID=0) associated with usage=CB. FIG. 9B shows a case where the second SRS resource set corresponds to the second smallest SRS resource set ID (here, SRS resource set ID=1) associated with usage=CB. SRS resource set ID=0 and SRS resource set ID=1 may each include different SRS resources.

[0136] Explicit Mapping When multiple SRS resource sets are configured, the SRS resource set corresponding to the first SRS resource set and the SRS resource set corresponding to the second SRS resource set may be notified to the UE. For example, a predetermined upper layer parameter may be added for each SRS resource set to distinguish the first SRS resource set from the second SRS resource set.

[0137] An upper layer parameter indicating an SRS resource set group ID (e.g., SrsResourceSetGroupId={0,1}) may be set for each SRS resource set with usage=CB / NCB. The UE may determine an SRS resource set with SrsResourceSetGroupId=0 set as the first SRS resource set (see FIG. 10A), and an SRS resource set with SrsResourceSetGroupId=1 set as the second SRS resource set (see FIG. 10B).

[0138] This may mean that a predetermined SrsResourceSetGroupId (e.g., SrsResourceSetGroupId=0) is set for an SRS resource set for which no SrsResourceSetGroupId is set. For example, if no SrsResourceSetGroupId is set for SRS resource set #a, the UE may determine that a predetermined SrsResourceSetGroupId (e.g., SrsResourceSetGroupId=0) is set / applied to the SRS resource set #a.

[0139] [NCB-based UL transmission] In the case of NCB, for example, four SRS resources per SRS resource set may be configured in the UE by higher layer signaling, and one of the four SRS resources may be indicated to the UE by DCI (e.g., a 2-bit SRI field).

[0140] In the case of NCB-based UL MIMO for PUSCH, a predetermined SRI field / SRS resource set may be applied to the repeated transmission for a single TRP and the repeated transmission for multiple TRPs. The repeated transmission for a single TRP may be interpreted as a single PUSCH transmission (or when the number of repetitions of the PUSCH (e.g., the repetition number) is 1).

[0141] Repeated transmission for a single TRP When a repeat transmission for a single TRP is indicated, a specific SRI field / SRS resource set corresponding to each TRP may be applied. For example, when a first TRP (e.g., TRP#1) is designated as a repeat transmission for a single TRP, the UE may apply the first SRI field / SRS resource set for the repeat transmission of the PUSCH.

[0142] When a second TRP (e.g., TRP#2) is designated as a repetitive transmission for a single TRP, the UE may apply the first SRI field / second SRS resource set to the repetitive transmission of the PUSCH. That is, the same SRI field may be applied to the PUSCH transmission for TRP#1 and TRP#2. This is because the second SRI field does not indicate the number of layers.

[0143] Repeated transmission for multiple TRPs When repeated transmission for multiple TRPs is indicated, a beam mapping pattern may be defined / configured / indicated by higher layers (e.g., RRC) / MAC CE / DCI.

[0144] When a repeat transmission for multiple TRPs is instructed, multiple (e.g., two) SRI fields / SRS resource sets may be applied, respectively. For example, among the repeat transmissions for multiple TRPs, a first SRI field / first SRS resource set may be applied to the transmission for TRP#1, and a second SRI field / second SRS resource set may be applied to the transmission for TRP#2.

[0145] In this way, the first SRI field / first SRS resource set is applied to repeated transmission for the first TRP (e.g., TRP#1), and the second SRI field / second SRS resource set is applied to repeated transmission for the second TRP (e.g., TRP#2), thereby enabling flexible control of transmission for each TRP.

[0146] The mapping between the SRS resource set configured in the higher layer and the first SRS resource set / second SRS resource set may be implicit (e.g., implicit mapping) or explicit (e.g., explicit mapping).

[0147] <Fourth embodiment> In the above first to third embodiments, the following UE capabilities may be set. Note that the following UE capabilities may be interpreted as parameters (for example, upper layer parameters) set in the UE from a network (for example, a base station).

[0148] UE capability information regarding whether or not repeated transmission of PUSCH for multiple TRPs (MTRP PUSCH) is supported may be defined.

[0149] UE capability information regarding whether to support dynamic switching between repeat transmission of a PUSCH for multiple TRPs (MTRP PUSCH) and repeat transmission of a PUSCH for a single TRP (STRP PUSCH) may be defined.

[0150] UE capability information regarding whether or not PUSCH transmission using a specific DCI field (first embodiment) is supported may be defined.

[0151] UE capability information regarding whether to support a configuration (for example, the third embodiment) in which codebook-based / non-codebook-based PUSCH repetition transmission is performed for a single TRP / multiple TRPs may be defined.

[0152] UE capability information regarding whether or not at least one of the first to third embodiments is supported for codebook-based / non-codebook-based PUSCH transmission may be defined.

[0153] Note that the embodiments of the present disclosure may be applied under at least one of the following conditions: when the UE reports UE capabilities corresponding to the at least one of the above to the NW; and when the at least one UE capability is configured / activated / instructed to the UE by higher layer signaling. The embodiments of the present disclosure may be applied when a specific higher layer parameter is configured / activated / instructed to the UE.

[0154] According to the fourth embodiment, the UE can achieve the functions of the above-described embodiments while maintaining compatibility with existing specifications.

[0155] (wireless communication system) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0156] 11 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0157] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0158] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0159] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0160] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0161] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0162] Each CC may 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 be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may be a frequency band higher than FR2.

[0163] Furthermore, the user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

[0164] Multiple base stations (e.g., RRHs) 10 may be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, base station 11, which corresponds to the upper station, may be called an Integrated Access Backhaul (IAB) donor, and base station 12, which corresponds to the relay station (relay), may be called an IAB node.

[0165] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0166] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0167] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the radio communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0168] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0169] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0170] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0171] The PDSCH transmits user data, higher layer control information, System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit Master Information Block (MIB).

[0172] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0173] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as an UL grant, a UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

[0174] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0175] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," "CORESET setting," etc. in the present disclosure may be read interchangeably.

[0176] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0177] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0178] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted as DL-RS.

[0179] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as reference signals.

[0180] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0181] (base station) 12 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0182] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0183] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0184] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0185] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0186] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0187] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0188] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0189] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0190] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0191] The transceiver 120 (transmission processor 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0192] The transmitting / receiving unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna .

[0193] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna .

[0194] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0195] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0196] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0197] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0198] The transceiver 120 may transmit downlink control information including information about repeated transmission of the uplink shared channel (PUSCH) to the terminal.

[0199] The control unit 110 may use downlink control information to control notification of the number of transmission and reception points at which the terminal repeatedly transmits the PUSCH, and the transmission and reception points or sounding reference signal resource indicators (SRIs) corresponding to each PUSCH transmission in the repeated transmission of the PUSCH.

[0200] (user terminal) 13 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transmitting / receiving antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transmitting / receiving antenna 230.

[0201] Note that this example mainly shows functional blocks of the characteristic parts of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0202] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0203] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 220.

[0204] The transceiver 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 transceiver unit 220 may be configured from a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0205] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0206] The transmitting / receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0207] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0208] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0209] The transceiver 220 (transmission processing unit 2211) may perform 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, and generate a bit string to be transmitted.

[0210] The transceiver 220 (transmission processor 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0211] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and when transform precoding is not enabled, the transceiver unit 220 may not perform DFT processing as the transmission processing.

[0212] The transmitting / receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna 230.

[0213] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0214] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0215] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0216] The transmitting section and receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0217] The transceiver 220 may receive downlink control information (for example, DCI including a specific DCI field) including information related to repeated transmission of the uplink shared channel (PUSCH).

[0218] The control unit 210 may determine, based on the downlink control information, at least one of the number of transmission and reception points for repeatedly transmitting the PUSCH, and the transmission and reception points or sounding reference signal resource indicators (SRIs) corresponding to each PUSCH transmission in the repeated transmission of the PUSCH.

[0219] A plurality of sounding reference signal resource sets may be configured for repeated transmission of the PUSCH, and a PUSCH repeated transmission index or a control resource set pool index may be associated with each of the plurality of sounding reference signal resource sets.

[0220] One sounding reference signal resource set may be configured for repeated transmission of the PUSCH, and a PUSCH repeated transmission index or a control resource set pool index may be associated with each of a plurality of sounding reference signal resources included in a plurality of sounding reference signal resource sets.

[0221] At least one of the SRI field and the sounding reference signal resource to be applied may be determined based on whether a codebook is applied to the PUSCH and the number of transmission and reception points corresponding to repeated transmission of the PUSCH.

[0222] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or multiple devices with software.

[0223] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As mentioned above, the implementation method of each is not particularly limited.

[0224] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 14 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0225] In this disclosure, terms such as apparatus, circuit, device, section, unit, etc. may be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0226] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0227] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0228] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0229] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be realized in a similar manner.

[0230] The memory 1002 is a computer-readable recording medium and may be configured 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), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to an embodiment of the present disclosure.

[0231] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as a secondary storage device.

[0232] The communication device 1004 is hardware (transmission / reception device) for communicating between computers 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, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0233] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0234] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0235] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0236] (Variation) Note that terms explained in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0237] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0238] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0239] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol), and may be a time unit based on numerology.

[0240] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0241] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0242] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0243] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. However, the definition of TTI is not limited to this.

[0244] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0245] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0246] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0247] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0248] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0249] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0250] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0251] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0252] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0253] The BWP may include an UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0254] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0255] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0256] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0257] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0258] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0259] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0260] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0261] Notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0262] Note that the physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be called an RRC message, such as an RRC connection setup message or an RRC connection reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0263] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0264] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values (e.g., comparison with a predetermined value).

[0265] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0266] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0267] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0268] 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," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0269] In this 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. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0270] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by 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 entire coverage area of a base station and / or base station subsystem that provides communication service within this coverage.

[0271] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0272] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0273] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile object, or the mobile object itself. The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0274] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0275] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0276] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0277] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the specific order presented.

[0278] Each aspect / embodiment described in the present disclosure may be related to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems that use 802.20, Ultra-Wide Band (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are based on and extend these systems. Furthermore, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0279] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0280] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0281] The term "determining," as used in this disclosure, may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0282] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0283] Also, "decision" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "decision" may be considered to be "deciding" on some action.

[0284] Furthermore, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," or the like.

[0285] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0286] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0287] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0288] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0289] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0290] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. a receiver for receiving higher layer parameters for configuring a plurality of sounding reference signal resource sets for repeated transmission of a physical uplink shared channel (PUSCH); a control unit that determines a sounding reference signal resource indicator (SRI) corresponding to each PUSCH transmission in repeated transmission of the PUSCH based on downlink control information, A terminal in which repeated transmission of a PUSCH is associated with each of a plurality of sounding reference signal resource sets.

2. A terminal as described in claim 1, wherein the control unit determines the order of SRIs to be applied to repeated transmission of the PUSH based on the downlink control information.

3. A terminal as described in claim 1 or claim 2, wherein when multiple different control resource set pool indices are set, a control resource set pool index is associated with each of the multiple sounding reference signal resource sets.

4. receiving higher layer parameters for configuring a plurality of sounding reference signal resource sets for repeated transmissions of a physical uplink shared channel (PUSCH); determining a sounding reference signal resource indicator (SRI) corresponding to each PUSCH transmission in the repeated transmission of the PUSCH based on downlink control information; A wireless communication method for a terminal in which repeated transmission of a PUSCH is associated with each of a plurality of sounding reference signal resource sets.

5. a transmitter configured to transmit, to a terminal, higher layer parameters for configuring a plurality of sounding reference signal resource sets for repeated transmission of a physical uplink shared channel (PUSCH); a control unit that controls notification of a sounding reference signal resource indicator (SRI) corresponding to each PUSCH transmission in repeated transmission of the PUSCH by using downlink control information; A base station in which repeated transmission of a PUSCH is associated with each of a plurality of sounding reference signal resource sets.

6. A system including a terminal and a base station, The terminal a receiver for receiving higher layer parameters for configuring a plurality of sounding reference signal resource sets for repeated transmission of a physical uplink shared channel (PUSCH); a control unit that determines a sounding reference signal resource indicator (SRI) corresponding to each PUSCH transmission in repeated transmission of the PUSCH based on downlink control information, Repeated transmission of the PUSCH is associated with each of a plurality of sounding reference signal resource sets; The base station A system comprising a transmitter for transmitting the upper layer parameters to the terminal.

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