Terminal, wireless communication method, base station and system

Abstract

A terminal that is an aspect of this disclosure has: a reception unit that receives one downlink control information (DCI) for at least one physical uplink shared channel (PUSCH); and a control unit that controls the application of transmitted precoding matrix indicators (TPMI) and transmission ranks to a plurality of PUSCH transmissions that use a plurality of SRS resource indicators (SRI) or at least one PUSCH transmission that uses a single SRI, controlling same on the basis of a TPMI for the PUSCH and at least one piece of information indicating the transmission rank, which are included in the DCI. An aspect of this disclosure makes it possible to appropriately control the repetitive transmission of PUSCH even when multi-TRP is applied.

Description

Terminal, wireless communication method and base station

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

[0002] Long Term Evolution (LTE) has been specified for the Universal Mobile Telecommunications System (UMTS) network with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) has been 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, etc.) are also being considered.

[0004] 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

[0005] 3GPP Rel. 15 supports repeated transmission for UL data channels (e.g., Physical Uplink Shared Channel (PUSCH)). The UE controls the transmission of PUSCH over multiple slots (e.g., K consecutive slots) based on a repetition factor K set by the network (e.g., a base station). In other words, when repeated transmission is performed, each PUSCH is transmitted in a different slot (e.g., slot by slot).

[0006] On the other hand, in Rel. 16 and later, when PUSCH is repeatedly transmitted, it is being considered to transmit multiple PUSCHs within one slot. In other words, each PUSCH is transmitted in units shorter than a slot (for example, in subslot units or minislot units).

[0007] Furthermore, in Rel. 16 and later, dynamic switching between single PUSCH transmission and repeated PUSCH transmission is being considered.

[0008] In addition, NR is considering communication using one or more transmission / reception points (TRP) (multi-TRP).

[0009] However, in the NR specifications up to now, there has been insufficient consideration of how to control the repeated transmission of PUSCH in multi-panel / TRP. If the repeated transmission of PUSCH in multi-TRP is not performed appropriately, there is a risk of a decrease in throughput or a deterioration in communication quality.

[0010] Therefore, one object of the present disclosure is to provide a terminal, a radio communication method, and a base station that can appropriately control PUSCH repeat transmission.

[0011] A terminal according to one aspect of the present disclosure is characterized by having: a receiver that receives one Downlink Control Information (DCI) for one or more Physical Uplink Shared Channels (PUSCHs); and a controller that controls application of a Transmitted Precoding Matrix Indicator (TPMI) and a transmission rank to transmission of a plurality of PUSCHs using a plurality of SRS Resource Indicators (SRIs) or transmission of one or more PUSCHs using a single SRI, based on one or more pieces of information indicating a TPMI and a transmission rank for the PUSCHs, the TPMI being included in the DCI.

[0012] According to one aspect of the present disclosure, repeated PUSCH transmission can be appropriately controlled even when multi-TRP is applied.

[0013] FIGS. 1A and 1B are diagrams illustrating an example of repeated transmission of a PUSCH. FIGS. 2A and 2B are diagrams illustrating an example of an invalid symbol pattern. FIGS. 3A and 3B are diagrams illustrating an example of nominal repetitions and actual repetitions. FIG. 4 is a diagram illustrating an example of repeated transmission of a PUSCH in multi-TRP. FIG. 5 is a diagram illustrating an example of setting a maximum transmission rank value according to the first embodiment. FIGS. 6A to 6C are diagrams illustrating an example of a TPMI instruction according to the second embodiment. FIGS. 7A to 7C are diagrams illustrating other examples of TPMI instructions according to the second embodiment. FIG. 8 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 9 is a diagram illustrating an example of a configuration of a base station according to an embodiment. FIG. 10 is a diagram illustrating an example of a configuration of a user terminal according to an embodiment. FIG. 11 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment.

[0014] (Repeated Transmission) Rel. 15 supports repeated transmission in data transmission. For example, a base station (network (NW), gNB) repeatedly transmits DL data (e.g., downlink shared channel (PDSCH)) a predetermined number of times. Alternatively, a UE repeatedly transmits UL data (e.g., uplink shared channel (PUSCH)) a predetermined number of times.

[0015] 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 referred to as a repetition factor K or an aggregation factor K.

[0016] In FIG. 1A, the repetition factor K=4, but the value of K is not limited to this. Furthermore, the nth repetition may be referred to as the nth transmission occasion or the like and may be identified by a repetition index k (0≦k≦K−1). Furthermore, while FIG. 1A illustrates 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.

[0017] For example, in Figure 1A, the UE receives information indicating the repetition factor K (e.g., aggregationFactorUL or aggregationFactorDL) semi-statically 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.

[0018] The MAC signaling may use, for example, a MAC Control Element (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.

[0019] The UE controls the reception processing of the PDSCH (e.g., at least one of reception, demapping, demodulation, and decoding) or the transmission processing of the PUSCH (e.g., at least one of transmission, mapping, modulation, and coding) in 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., start symbol, number of symbols in each slot, etc.); - Allocation of frequency domain resources (e.g., a predetermined number of resource blocks (RBs), a predetermined number of resource block groups (RBGs)); - Modulation and Coding Scheme (MCS) index; - Configuration of the demodulation reference signal (DMRS) for the PUSCH; - Spatial relation info of the PUSCH or the state of the Transmission Configuration Indication (TCI) or Transmission Configuration Indicator (TCI-state).

[0020] 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.

[0021] For example, the UE may determine 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.

[0022] 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.

[0023] When the communication direction of 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 uplink and downlink communication direction indication information for TDD control (e.g., RRC IEs “TDD-UL-DL-ConfigCommon” and “TDD-UL-DL-ConfigDedicated”) and the slot format indicator of DCI (e.g., DCI format 2_0), the resources of the slot including that symbol may not be transmitted (or received).

[0024] In Rel. 15, the PUSCH is repeatedly transmitted across multiple slots (in slot units) as shown in Fig. 1A, but in Rel. 16 and later, it is expected that the PUSCH will be repeatedly transmitted in units shorter than slots (for example, in subslot units, minislot units, or units of a predetermined number of symbols) (see Fig. 1B).

[0025] In FIG. 1B, the repetition factor K=4, but the value of K is not limited to this. Furthermore, the nth repetition may be referred to as the nth transmission occasion or the like, and may be identified by a repetition index k (0≦k≦K−1). Furthermore, while FIG. 1B illustrates 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.

[0026] 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 a 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 the 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 the DCI.

[0027] 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., a TDRA field) in the DCI. For example, a table may be supported that defines the correspondence between the bit value notified in the DCI, the repetition factor K, the start symbol S, and the number of symbols L.

[0028] The slot-based repetitive transmission shown in FIG. 1A may be referred to as repetition transmission type A (e.g., PUSCH repetition Type A), and the subslot-based repetitive transmission shown in FIG. 1B may be referred to as repetition transmission type B (e.g., PUSCH repetition Type B).

[0029] 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).

[0030] Either repetitive transmission type A or repetitive transmission type B may be configured in the UE for each DCI format that schedules the PUSCH.

[0031] For example, for a first DCI format (e.g., DCI format 0_1), if higher layer signaling (e.g., PUSCHRepTypeIndicator-AorDCIFormat0_1) is configured to repetitive transmission type B (e.g., PUSCH-RepTypeB), the UE applies repetitive transmission type B for PUSCH repetitive transmission scheduled in the first DCI format. Otherwise (e.g., if PUSCH-RepTypeB is not configured or if PUSCH-RepTypA is configured), the UE applies repetitive transmission type A for PUSCH repetitive transmission scheduled in the first DCI format.

[0032] Furthermore, in Rel. 16 and later, dynamic switching between single PUSCH transmission and repeated PUSCH transmission is being considered.

[0033] When a higher layer parameter related to the time domain allocation of the PUSCH (e.g., pusch-TimeDomainAllocationListDCI-0-1-r16 or pusch-TimeDomainAllocationListDCI-0-2-r16) is configured for the UE, the number of repetitions (e.g., 1, 2, 3, 4, 7, 8, 12, or 16) may be configured by a parameter related to the number of PUSCH repetitions (e.g., numberOfRepetitions-r16) included in the higher layer parameter. The UE may determine the number of repetitions of the PUSCH 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.

[0034] (Invalid Symbol Pattern) When repetitive transmission type B is applied to PUSCH transmission, it is also considered to notify the UE of information on symbols (or symbol patterns) that cannot be used for PUSCH transmission. A symbol pattern that cannot be used for PUSCH transmission may be called an invalid symbol pattern, invalid symbol pattern, or the like.

[0035] It is being considered to notify the invalid symbol pattern using at least one of higher layer signaling and DCI, which may be in a predetermined DCI format (e.g., at least one of DCI formats 0_1 and 0_2).

[0036] For example, information about invalid symbol patterns that cannot be used for PUSCH transmission may be notified to the UE using a first higher layer parameter. Furthermore, whether or not the information about the invalid symbol patterns is applied may be notified to the UE using a DCI. In this case, a bit field (a field for notifying whether or not an invalid symbol pattern is applied) for indicating whether or not the information about the invalid symbol patterns is applied may be set in the DCI.

[0037] Furthermore, the second higher layer parameter may be used to notify the UE of whether a notification field (or additional bit) in the DCI is configured. That is, when the UE is notified of information about an invalid symbol pattern by the first higher layer parameter, the UE may determine whether to apply the information about the invalid symbol pattern based on the second higher layer parameter and the DCI.

[0038] When the first upper layer parameter is not signaled or configured, the UE may control the transmission of the PUSCH without considering the invalid symbol pattern. When the first upper layer parameter is signaled or configured, the UE may determine whether to apply the invalid symbol pattern based on the second upper layer parameter and the DCI. For example, when the second upper layer parameter instructs the DCI to add an additional bit (or a predetermined field) indicating whether to apply the invalid symbol pattern, the UE may determine whether to apply the invalid symbol pattern based on the predetermined field.

[0039] The first upper layer parameter may be information indicating symbol patterns that are disabled for PUSCH transmission, and may be in the form of a bitmap, for example (see FIG. 2A ). FIG. 2A illustrates an example in which disabled symbol patterns are defined in a bitmap (1-D bitmap) for the time domain. The UE may determine resources available for PUSCH transmission in one or more frequency bandwidths (e.g., BWPs) based on the information about the disabled symbol patterns (see FIG. 2B ).

[0040] Here, a case is shown in which one or a common invalid symbol pattern is applied to a plurality of BWPs, but a different invalid symbol pattern may be set or applied to each BWP.

[0041] (Nominal repetitions / Actual repetitions) When repeat transmission type B is applied and repeat transmission is performed in sub-slot units, there may be cases where a repeat transmission crosses a slot boundary, depending on the repetition coefficient (K) and the data allocation unit, etc.

[0042] 3A shows an example of applying repetition transmission type B when the repetition factor (K) is 4 and the PUSCH length (L) is 4. In FIG. 3A, a PUSCH with k=3 is arranged across a slot boundary. In this case, the PUSCH may be divided (or segmented) based on the slot boundary for transmission (see FIG. 3B).

[0043] Also, a case is assumed in which a slot contains symbols that cannot be used for PUSCH transmission (for example, DL symbols or invalid symbols). Figure 3A shows a case in which some symbols in which the PUSCH with k = 1 is allocated contain symbols that cannot be used for the PUSCH transmission (here, DL symbols). In such a case, PUSCH transmission may be performed using symbols excluding the DL symbols (see Figure 3B).

[0044] When DL symbols (or invalid symbols) are included in symbols other than both ends of a certain PUSCH allocated symbol, PUSCH transmission may be performed using symbols other than the DL symbol portion. In this case, the PUSCH may be divided (or segmented).

[0045] Figure 3B shows a case where, in subslot-based repeated transmission, a PUSH with k = 1 (Rep #2) is divided into two by a DL symbol (Rep #2-1 and #2-2), and a PUSH with k = 3 (Rep #4) is divided into two by a slot boundary (Rep #4-1 and #4-2).

[0046] Note that repeated transmissions before considering DL symbols, invalid symbols, or slot boundaries (FIG. 3A) may be called nominal repetitions, and repeated transmissions after considering DL symbols, invalid symbols, or slot boundaries (FIG. 3B) may be called actual repetitions.

[0047] (Spatial Relationship for SRS, PUSCH) In Rel. 15 NR, a UE may receive information (SRS configuration information, e.g., parameters in the RRC control element "SRS-Config") used to transmit a measurement reference signal (e.g., a sounding reference signal (SRS)).

[0048] Specifically, the UE may receive at least one of information regarding one or more SRS resource sets (SRS resource set information, e.g., the RRC control element "SRS-ResourceSet") and information regarding one or more SRS resources (SRS resource information, e.g., the RRC control element "SRS-Resource").

[0049] An SRS resource set may be associated with (or group together) a predetermined number of SRS resources, each of which may be identified by an SRS Resource Indicator (SRI) or SRS Resource Identifier (ID).

[0050] 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.

[0051] Here, the SRS resource type may indicate any one of periodic SRS (P-SRS), semi-persistent SRS (SP-SRS), and aperiodic CSI (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.

[0052] 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 or non-codebook use may be used to determine a codebook-based or non-codebook-based precoder for PUSCH transmission based on the SRI.

[0053] 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.

[0054] The SRS resource information may include an SRS resource ID (SRS-ResourceId), the number of SRS ports, the 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.

[0055] 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).

[0056] 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.

[0057] In the present disclosure, the SSB index, SSB resource ID, and SSB Resource Indicator (SSBRI) may be interchangeable. Furthermore, the CSI-RS index, CSI-RS resource ID, and CSI-RS Resource Indicator (CRI) may be interchangeable. Furthermore, the SRS index, SRS resource ID, and SRI may be interchangeable.

[0058] 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.

[0059] When the UE is configured with spatial relationship information regarding an SRS and an SSB or CSI-RS 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.

[0060] When the UE is configured with spatial relationship information between another SRS (reference SRS) and the target SRS for a certain 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.

[0061] 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) in the DCI. Specifically, the UE may use spatial relationship information of the SRS resources (e.g., the RRC information element "spatialRelationInfo") determined based on the value of the predetermined field (e.g., the SRI) for PUSCH transmission.

[0062] When using codebook-based transmission for 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 (1-bit SRI field).When using non-codebook-based transmission for 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 (2-bit SRI field).

[0063] (TPMI and Transmission Rank) In Rel. 16, it is considered that a Transmitted Precoding Matrix Indicator (TPMI) and a transmission rank for codebook-based PUSCH transmission are specified by specific fields (e.g., precoding information and number of layers fields) included in downlink control information (e.g., DCI format 0_1). Note that in the present disclosure, the term "rank" may be interchangeable with the term "layer."

[0064] 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).

[0065] The size (number of bits) of this particular field is variable depending on the number of antenna ports for PUSCH (e.g., the number of ports indicated by nrofSRS-Ports above) and some higher layer parameters.

[0066] The particular field may be a 0 bit if the higher layer parameters (e.g., txConfig) configured for the UE are set to non-codebook.

[0067] Furthermore, the particular field may be a 0 bit when the higher layer parameters (e.g., txConfig) configured for the UE for one antenna port are set to the codebook.

[0068] 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.

[0069] 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.

[0070] The other upper layer parameter may be at least one of a parameter for specifying a UL full power transmission mode (e.g., ul-FullPowerTransmission, ul-FullPowerTransmission-r16), a parameter indicating the maximum value of the UL transmission rank (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).

[0071] (Multi-TRP) In NR, one or more transmission / reception points (Transmission / Reception Points (TRP)) (multi-TRP) are considered to perform DL transmission to a UE using one or more panels (multi-panels). Also, it is considered that a UE performs UL transmission to one or more TRPs (see Figure 4).

[0072] Multiple TRPs may correspond to the same cell identifier (ID), or to different cell IDs, which may be physical or virtual cell IDs.

[0073] Incidentally, in NR Rel. 17 and later, it is being considered to indicate multiple (e.g., two) SRIs / TPMIs using a single DCI for PUSCH repeated transmission of multiple TRPs.

[0074] If the single DCI indicates multiple TPMIs, the following options 1 and 2 are possible: - Option 1: A field indicating multiple (e.g., two) TPMIs is used to indicate TPMI (values) for multiple (e.g., two) TRPs; - Option 2: A field indicating one TPMI is indicated, and a code point corresponding to the multiple (e.g., two) TPMI values ​​is set in the TPMI indicating field.

[0075] In Option 1, each code point of multiple TPMI fields may correspond to one TPMI value. The correspondence (association) between the TPMI fields and the TPMI values ​​may be defined in advance in the specifications. Furthermore, the correspondence (association) between the TPMI fields and the TPMI values ​​may be the correspondence defined up to Rel. 16 or the correspondence defined in Rel. 17 or later. The correspondence between the TPMI fields and the TPMI values ​​may be different for each of the multiple TPMI fields.

[0076] In Option 2, a code point indicating one TPMI field may correspond to multiple (e.g., two) TPMI values. The correspondence (association) between the TPMI field and the TPMI value may be defined in advance in a specification, or may be notified / configured / activated by RRC signaling / MAC CE.

[0077] On the other hand, indicating multiple TPMIs may increase the signaling overhead of DCI. In NRs from Rel. 17 onwards, in order to suppress the increase in overhead of the DCI, it has been considered to limit the transmission rank of PUSCH in repeated transmission of PUSCH using multiple TRPs. For example, in repeated transmission of PUSCH using multiple TRPs, it has been considered to limit the maximum transmission rank of PUSCH to a specific value (e.g., 2) or the number of candidate TPMI values. If the maximum transmission rank of each PUSCH transmission for multiple TRPs / multiple TRPs is limited, the number of DCI fields required for repeated transmission of PUSCH using multiple TRPs can be reduced.

[0078] However, in a situation where the use of a single TRP and the use of multiple TRPs are dynamically switched, when the maximum rank / candidate TPMI value of repeated transmission of a PUSH using multiple TRPs is limited, there has been insufficient consideration of the maximum rank / candidate TPMI value to be limited and the method of instructing the UE.

[0079] More specifically, in a situation where the use of a single TRP and the use of multiple TRPs are dynamically switched, when the maximum rank / candidate TPMI value of a repeated transmission of a PUSH using multiple TRPs is limited (e.g., when the maximum rank is limited to a specific number (e.g., 2)), there is insufficient consideration as to whether the maximum rank / candidate TPMI value of a single PUSH transmission / repeated transmission of a PUSH using a single TRP is the same as the maximum rank / candidate TPMI value of a repeated transmission of a PUSH using multiple TRPs, or whether it is different from the maximum rank / candidate TPMI value of a repeated transmission of a PUSH using multiple TRPs.

[0080] Furthermore, when the maximum rank / candidate TPMI value for a single PUSCH transmission / repeated PUSCH transmission using a single TRP is different from the maximum rank / candidate TPMI value for a repeated PUSCH transmission using multiple TRPs, there is insufficient consideration as to how to instruct the UE on the TPMI field for a single PUSCH transmission / repeated PUSCH transmission using a single TRP and the TPMI field for a repeated PUSCH transmission using multiple TRPs (how the UE should interpret the instructed TPMI field).If these considerations are insufficient, repeated PUSCH transmission using multiple TRPs may not be performed appropriately, resulting in a decrease in throughput or degradation of communication quality and an increase in DCI signaling overhead.

[0081] Therefore, the present inventors have conceived a method for controlling PUSCH repeated transmission that solves the above problem. More specifically, the present inventors have conceived a control method that takes into account the fact that the maximum rank differs between transmissions using a single TRP and transmissions using multiple TRPs.

[0082] Hereinafter, embodiments of 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.

[0083] 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. Furthermore, panel identifier (ID) and panel may be interchangeable. TRP ID and TRP may be interchangeable.

[0084] In the present disclosure, the terms index, ID, indicator, and resource ID may be interchangeable.

[0085] 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."

[0086] In the present disclosure, terms such as a list, a group, a cluster, and a subset may be interchangeable. In the present disclosure, terms such as Spatial Relation Information (SRI), an SRS Resource Indicator (SRI) (or an SRI field), an SRS resource, and a precoder may be interchangeable.

[0087] 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.

[0088] In the present disclosure, the first TRP and the second TRP may be interchangeably read as the first PUSH and the second PUSH, the first PUSH transmission opportunity and the second PUSH transmission opportunity, the first SRI and the second SRI, etc.

[0089] In the present disclosure, transmission rank, maximum transmission rank, maximum value of transmission rank, number of TPMI candidates, number of TPMIs, maximum number of TPMIs, UL transmission rank, maximum value of UL transmission rank, etc. may be read interchangeably.

[0090] In the following embodiments, repeated transmission of a PUSH using multiple TRPs may be interchangeably read as PUSH transmission using multiple TRPs, repeated transmission of a PUSH for multiple TRPs, PUSH spanning multiple TRPs, repeated PUSH spanning multiple TRPs, simply repeated PUSH, repeated transmission, multiple PUSH transmission, PUSH transmission using multiple SRIs, etc.

[0091] In addition, a PUSH transmission using a single TRP may also be referred to as a PUSH transmission using a single TRP, a repeated PUSH transmission for a single TRP, a PUSH across a single TRP, a repeated PUSH across a single TRP, a single PUSH transmission for a single TRP, simply a single PUSH transmission, a PUSH transmission in a single TRP, a PUSH transmission using a single SRI, etc.

[0092] In the present disclosure, a correspondence relationship between code points in the TPMI field for a PUSCH using a single TRP and TPMI values ​​may be referred to as a first correspondence relationship for TPMI, a first correspondence relationship, etc. Also, a correspondence relationship between code points in the TPMI field for a PUSCH using multiple TRPs and TPMI values ​​may be referred to as a second correspondence relationship for TPMI, a second correspondence relationship, etc.

[0093] In this disclosure, repeated transmission of a PUSH for a single TRP may mean repeated transmission of multiple PUSHs transmitted using the same SRI / beam / precoder.

[0094] In each embodiment of the present disclosure, UL transmission is described using, as an example, PUSCH transmission for single / multiple TRPs using one DCI and codebook-based PUSCH transmission. However, non-codebook-based PUSCH transmission may also be applied, and PUSCH transmission to which each embodiment can be applied is not limited to these. When each embodiment of the present disclosure is applied to non-codebook-based PUSCH transmission, one or more SRS resources (SRIs) may be indicated to the UE by each SRI field. Furthermore, common or different embodiments may be applied to codebook-based PUSCH transmission and non-codebook-based PUSCH transmission. Furthermore, UL transmission is not limited to PUSCH, and each embodiment of the present disclosure can also be applied to PUCCH as appropriate (PUSCH may be read as PUCCH).

[0095] 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 interchangeably read as switching, change, changing, applying, instructing, setting, etc.

[0096] In the present disclosure, a DCI may dynamically indicate / switch between single PUSCH transmission / repeated PUSCH transmission using a single TRP and repeated PUSCH transmission using multiple TRPs. This dynamic switching may utilize a specific field included in DCI defined up to Rel. 16, or a specific field defined in Rel. 17 or later.

[0097] (Wireless Communication Method) <First Embodiment> In codebook-based PUSCH transmission, a UE may configure / be notified of a maximum value of a UL transmission rank (layer) by using higher layer signaling. The maximum value of the UL transmission rank may be configured / notified using a specific higher layer parameter (e.g., maxRank included in PUSCH-Config).

[0098] The setting / notification of the maximum UL transmission rank to the UE may be in accordance with at least one of the following embodiments 1-1 and 1-2.

[0099] <<Embodiment 1-1>> A single maximum value of the UL transmission rank may be set for a UE. The UE may receive information indicating the maximum value of the UL transmission rank for which a single value is to be set, by using higher layer signaling.

[0100] The information indicating the maximum value of the UL transmission rank may utilize a higher layer parameter of Rel. 15 / 16 (e.g., maxRank included in PUSCH-Config) or may be a specific higher layer parameter defined in Rel. 17 or later.

[0101] The UE may apply the configured maximum value of the UL transmission rank to both a single PUSCH transmission / repeated PUSCH transmission using a single TRP and repeated PUSCH transmission using multiple TRPs.

[0102] In embodiment 1-1, when a UE is configured to repeatedly transmit a PUSCH using multiple TRPs, the value of the UL transmission rank may be restricted. For example, the value of the UL transmission rank may be determined from a first number of candidates (e.g., 1 or 2), or may be determined from a number greater than the first number of candidates (e.g., 1, 2, or 3).

[0103] In embodiment 1-1, the UE may be notified of information indicating the maximum transmission rank for UL transmission using multiple TRPs using higher layer signaling, and may be notified of information indicating a transmission rank equal to or less than the maximum value using DCI.

[0104] <<Embodiment 1-2>> The maximum transmission rank of UL transmission using a single TRP and the maximum transmission rank of UL transmission using multiple TRPs may be set separately (independently) for a UE. The UE may receive information indicating the maximum transmission rank of UL transmission using a single TRP and information indicating the maximum transmission rank of UL transmission using multiple TRPs using upper layer signaling.

[0105] The information indicating the maximum value of the transmission rank for UL transmissions using a single TRP may use a higher layer parameter of Rel. 15 / 16 (e.g., maxRank included in PUSCH-Config) or may be a specific higher layer parameter specified in Rel. 17 or later. Furthermore, the information indicating the maximum value of the transmission rank for UL transmissions using multiple TRPs may be a specific higher layer parameter specified in Rel. 17 or later.

[0106] The UE may determine the transmission rank of UL transmission using multiple TRPs based on the maximum value of the transmission rank of UL transmission using multiple TRPs. The UE may determine the value of the UL transmission rank for repeated transmission of PUSCH using multiple TRPs from a first number of candidates (e.g., 1 or 2). For example, the UE may be notified of information indicating the maximum value of the transmission rank of UL transmission using multiple TRPs using higher layer signaling, and may be notified of information indicating a transmission rank equal to or less than the maximum value using DCI.

[0107] Furthermore, the UE may determine the value of the UL transmission rank for repeated transmission of the PUSCH using multiple TRPs from a second number of candidates (e.g., 1, 2, 3, or 4). In this case, the second number of candidates may be limited (or a part of the second number of candidates) and configured for the UE. By limiting the transmission rank for repeated transmission of the PUSCH using multiple TRPs, it is possible to reduce the signaling overhead of DCI. Whether or not to limit the transmission rank for repeated transmission of the PUSCH using multiple TRPs may depend on the configuration for the UE.

[0108] The UE may determine the transmission rank of the UL transmission using a single TRP based on the maximum transmission rank of the UL transmission using a single TRP. The UE may determine the UL transmission rank value for the single PUSCH transmission / repeated PUSCH transmission using a single TRP from a second number of candidates (e.g., 1, 2, 3, or 4).

[0109] FIG. 5 is a diagram illustrating an example of setting the maximum transmission rank according to the first embodiment. The example illustrated in FIG. 5 illustrates information elements (e.g., RRC information elements) for setting / notifying a UE of the transmission rank of UL transmission. FIG. 5 illustrates the contents of the above-described first and second embodiments. In FIG. 5, information related to the PUSCH configuration (here, PUSCH-Config) includes information indicating the maximum transmission rank for UL transmission using a single TRP (here, maxRank-for-S-TRP) and information indicating the maximum transmission rank for UL transmission using multiple TRPs (maxRank-for-M-TRP). The UE determines the transmission rank for UL transmission using a single TRP based on the maxRank-for-S-TRP, and determines the transmission rank for UL transmission using multiple TRPs based on the maxRank-for-M-TRP.

[0110] Note that the UE may not assume / expect to receive a DCI indicating a transmission rank value exceeding the maximum value of the transmission rank set by higher layer signaling, and may ignore the instruction when the UE receives a DCI indicating a value exceeding the maximum value of the transmission rank set by higher layer signaling.

[0111] According to the first embodiment described above, it is possible to apply a limited transmission rank to each of UL transmissions using a single TRP and UL transmissions using multiple TRPs.

[0112] <Second embodiment> In codebook-based PUSCH transmission, the UE may assume that the correspondence relationship between the code points of the TPMI field for a PUSCH using a single TRP and the TPMI value (first correspondence relationship) is different from the correspondence relationship between the code points of the TPMI field for a PUSCH using multiple TRPs and the TPMI value (second correspondence relationship). In other words, the UE may determine the TPMI to be applied to the PUSCH using a single TRP based on the first correspondence relationship, and may determine the TPMI to be applied to the PUSCH using multiple TRPs based on the second correspondence relationship.

[0113] <<Embodiment 2-1>> When a UE is instructed to repeatedly transmit a PUSCH using multiple TRPs, the UE may be instructed to transmit multiple TPMIs using a single DCI according to at least one of the above-mentioned Option 1 and Option 2. The UE may apply the first correspondence relationship and the transmission rank of the UL transmission set for the repeated transmission of the PUSCH using multiple TRPs to the PUSCH transmission using multiple TRPs.

[0114] In this embodiment, the transmission rank for UL transmission may be determined / applied in accordance with the method described in the first embodiment above.

[0115] <<Embodiment 2-2>> When a UE is instructed to repeatedly transmit a PUSCH using a single TRP, the UE may be instructed to transmit one or more TPMIs using a single DCI according to at least one of Option 1 and Option 2. The UE may apply the first correspondence relationship and the transmission rank of the UL transmission set for the PUSCH transmission using a single TRP to the PUSCH transmission using a single TRP.

[0116] [Embodiment 2-2-1] In embodiment 2-2-1, as described in Option 1 above, a field (which may hereinafter be referred to as an indication field) indicating multiple (e.g., two) TPMIs may be notified to the UE.

[0117] For example, the UE may assume that a code point for indicating multiple (e.g., two) TPMIs is determined by combining code points in a field (indication field) indicating multiple TPMIs. For example, the UE may determine that a specific number (e.g., two) of most significant bits (MSBs) of the code points in the indication field are a first TPMI field for a first TRP. The UE may also determine that a specific number (e.g., two) of least significant bits (LSBs) of the code points in the indication field are a second TPMI field for a second TRP. In this case, the UE may determine the TPMI to be applied using the correspondence between the combined code points and TPMI values.

[0118] In the present disclosure, the MSB and the LSB may be interchangeable. Furthermore, in the present disclosure, an example of a combination of code points indicating two TPMIs is shown, but the indication field may be configured with a combination of code points indicating three or more TPMIs. When the indication field is configured with a combination of code points indicating three or more TPMIs, the code points in the indication field may be divided into specific numbers (e.g., 2), and the UE may determine that the Nth code point (N is an integer) is the Nth TPMI for the Nth TRP.

[0119] Each of the multiple code points that configure the above-mentioned indication field and indicate multiple TPMIs may correspond to one TPMI (value).

[0120] The correspondence (association) between the TPMI field and the TPMI value may be defined in advance in the specifications, or the correspondence defined up to Rel. 16 may be used, or the correspondence defined in Rel. 17 or later may be used.

[0121] [Embodiment 2-2-2] In embodiment 2-2-2, as described in Option 2 above, a field indicating one TPMI (which may hereinafter be referred to as an indication field) may be notified to the UE.

[0122] A code point in a field indicating one TPMI may correspond to one TPMI (value).

[0123] The correspondence (association) between the TPMI field and the TPMI value may be defined in advance in the specifications, or the correspondence defined up to Rel. 16 may be used, or the correspondence defined in Rel. 17 or later may be used.

[0124] 6A to 6C are diagrams illustrating an example of a TPMI indication according to the second embodiment. As shown in Fig. 6A, two TPMI fields (TPMI field #1 and TPMI field #2) are indicated to a UE from a network (NW, for example, a base station).

[0125] When a UE receives an instruction as shown in Figure 6A and is instructed to repeatedly transmit a PUSCH using multiple TRPs, it determines the transmission rank and TPMI value using the correspondence between the TPMI code points and TPMI values ​​corresponding to each TRP as shown in Figure 6B. In the example shown in Figures 6A and 6B, the UE is instructed to set "00" as the TPMI field (code point) #1 and "01" as the TPMI field (code point) #2. Based on the correspondence between the TPMI code points and TPMI values ​​for TRP #1, the UE determines that the transmission rank and TPMI to be applied to UL transmission using TRP #1 are "2 layer, TPMI = 0". Based on the correspondence between the TPMI code points and TPMI values ​​for TRP #2, the UE also determines that the transmission rank and TPMI to be applied to UL transmission using TRP #2 are "2 layer, TPMI = 1".

[0126] In the example shown in Figure 6B, the correspondence between TPMI code points and TPMI values ​​corresponding to different TRPs is shown separately, but a common correspondence may be used for each TRP.

[0127] Furthermore, when a UE receives an instruction as shown in Figure 6A and is instructed to repeatedly transmit a PUSCH using a single TRP, it determines the transmission rank and TPMI value using the correspondence between the TPMI code point and the TPMI value corresponding to the single TRP as shown in Figure 6C. In the examples shown in Figures 6A and 6C, the UE is instructed to set "00" as TPMI field (code point) #1 and "01" as TPMI field (code point) #2. The UE determines the two most significant bits of the TPMI code point (here, four bits) in the correspondence between the TPMI code point and the TPMI value as the first TPMI field. The UE also determines the two least significant bits of the TPMI code point in the correspondence between the TPMI code point and the TPMI value as the second TPMI field. In other words, the UE determines that the TPMI code point in the correspondence between the TPMI code point and the TPMI value is "0001", and from this correspondence determines that the transmission rank and TPMI to be applied to UL transmission are "4 layer, TPMI = 1".

[0128] Note that the correspondence between TPMI code points and TPMI values ​​in each drawing in this disclosure is merely an example, and the number of code points, the number of bits of a code point, each parameter value, and the like are not limited to this.

[0129] 7A to 7C are diagrams illustrating another example of a TPMI indication according to the second embodiment. As shown in Fig. 7A, one TPMI field is indicated to a UE from a network (NW, for example, a base station).

[0130] When a UE receives an instruction as shown in Figure 7A and is instructed to repeatedly transmit a PUSCH using multiple TRPs, it determines the transmission rank and TPMI value using the correspondence between the TPMI code points and TPMI values ​​corresponding to each TRP as shown in Figure 7B. In the example shown in Figures 7A and 7B, the UE is instructed to set the TPMI field (code point) to "0000." From this correspondence, the UE determines that the transmission rank and TPMI (TPMI value #1) to be applied to UL transmission using TRP #1 are "2 layers, TPMI = 0." Furthermore, from this correspondence, the UE determines that the transmission rank and TPMI (TPMI value #2) to be applied to UL transmission using TRP #2 are "2 layers, TPMI = 1."

[0131] Furthermore, when a UE receives an instruction as shown in Figure 7A and is instructed to repeatedly transmit a PUSCH using a single TRP, the UE determines the transmission rank and TPMI value using the correspondence between the TPMI code point and the TPMI value corresponding to the single TRP as shown in Figure 7C. In the example shown in Figures 7A and 7C, the UE is instructed to set the TPMI field (code point) to "0000". Based on this correspondence, the UE determines that the transmission rank and TPMI to be applied to UL transmission are "4 layers, TPMI = 0".

[0132] According to the second embodiment described above, it is possible to appropriately indicate the transmission rank and TPMI whether UL transmission is performed using a single TRP or multiple TRPs.

[0133] Third Embodiment In a third embodiment, a modification of the first and second embodiments will be described.

[0134] The UE may assume that specific upper layer parameters for determining the correspondence between TPMI code points and TPMI (values) are set differently for PUSH transmissions using a single TRP and for PUSH transmissions using multiple TRPs.

[0135] For example, the specific parameter may be at least one of a parameter for specifying a UL full power transmission mode (e.g., ul-FullPowerTransmission, ul-FullPowerTransmission-r16), a parameter indicating the maximum value of the UL transmission rank (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).

[0136] When a PUSH transmission using multiple TRPs is configured, the UE may utilize / apply the correspondence between the TPMI code point and the TPMI value corresponding to the specific parameter configured for the PUSH using multiple TRPs.

[0137] In addition, when a PUSH transmission using a single TRP is configured, the UE may use / apply the correspondence between the TPMI code point and the TPMI value corresponding to the specific parameter configured for the PUSH using a single TRP.

[0138] In addition, when a PUSH transmission using a single TRP is configured, the UE may use / apply the correspondence between the TPMI code point and the TPMI value corresponding to the specific parameter configured for the PUSH using multiple TRPs.

[0139] Furthermore, each embodiment of the present disclosure may be applied to any PUSCH repetition type. For example, each embodiment of the present disclosure may be applied to at least one of PUSCH repetition type A and PUSCH repetition type B.

[0140] The UE may assume that a specific upper layer parameter (e.g., at least one of maxRank, ul-FullPowerTransmission-r16, codebookSubset, and transformPrecoder) corresponding to PUSCH repetition type A is the same as the specific upper layer parameter corresponding to PUSCH repetition type B.

[0141] The UE may also assume that a specific upper layer parameter (e.g., at least one of maxRank, ul-FullPowerTransmission-r16, codebookSubset, and transformPrecoder) corresponding to PUSCH repetition type A and the specific upper layer parameter corresponding to PUSCH repetition type B are different (set separately).

[0142] According to the third embodiment described above, it is possible to flexibly configure UL transmissions using a single TRP and UL transmissions using multiple TRPs.

[0143] Fourth Embodiment In a fourth embodiment, UE capabilities will be described. A UE may report (transmit) to a NW whether it has the capability.

[0144] The UE capability for dynamically switching between repeated transmission of a PUSH using a single TRP / single PUSH transmission and repeated transmission of a PUSH using multiple TRPs may be defined as whether repeated transmission of a PUSH for multiple TRPs is supported or not.

[0145] The UE capability for dynamic switching between repeated transmission of a PUSCH using a single TRP / single PUSCH transmission and repeated transmission of a PUSCH using multiple TRPs may be defined as whether or not dynamic switching between single PUSCH transmission and repeated transmission of a PUSCH using multiple TRPs is supported.

[0146] In addition, the UE capability for dynamic switching between repeated transmission of a PUSCH using a single TRP / single PUSCH transmission and repeated transmission of a PUSCH using multiple TRPs may be defined as whether or not dynamic switching between repeated transmission of a PUSCH using a single TRP and repeated transmission of a PUSCH using multiple TRPs is supported.

[0147] In addition, the maximum value of the transmission rank for repeated transmission of a PUSCH using multiple TRPs may be defined as a UE capability.

[0148] In addition, the maximum value of the transmission rank for repeated transmission of a PUSCH using a single PUSCH transmission / single TRP may be defined as the UE capability.

[0149] In addition, whether or not a UE supports different specific upper layer parameters (e.g., at least one of maxRank, ul-FullPowerTransmission-r16, codebookSubset, and transformPrecoder) for a single PUSH transmission / repeated transmission of a PUSH using a single TRP and repeated transmission of a PUSH using multiple TRPs may be defined as a UE capability.

[0150] In addition, whether or not the UE supports different correspondences between TPMI code points and TPMI values ​​for a single PUSH transmission / repeated PUSH transmission using a single TRP and a repeated PUSH transmission using multiple TRPs may be defined as a UE capability.

[0151] Note that the embodiments of the present disclosure may be applied under at least one of the following conditions: when a UE reports UE capabilities corresponding to the at least one of the above to a 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.

[0152] (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.

[0153] 8 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).

[0154] 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.

[0155] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (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.

[0156] 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 SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0157] 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.

[0158] 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 (CCs) and dual connectivity (DC).

[0159] 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 higher than 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 correspond to a higher frequency band than FR2.

[0160] 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.

[0161] Multiple base stations (e.g., RRHs) 10 may be connected by wire (e.g., optical fiber compliant with 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.

[0162] 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.

[0163] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0164] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless 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).

[0165] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0166] 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.

[0167] 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)), or the like may be used as an uplink channel.

[0168] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0169] 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.

[0170] 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 a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0171] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching 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 the CORESET associated with a certain search space based on the search space configuration.

[0172] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0173] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation 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.

[0174] 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.

[0175] 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, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0176] 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 an SS (PSS, SSS) and a PBCH (and a 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 a reference signal.

[0177] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like 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).

[0178] (Base Station) Fig. 9 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.

[0179] 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.

[0180] 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.

[0181] 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, control information, sequences, etc. to be transmitted as signals, 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.

[0182] 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.

[0183] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, the RF unit 122, and a measurement unit 123.

[0184] 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 relates, such as an array antenna.

[0185] 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.

[0186] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0187] The transmitter / receiver unit 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.

[0188] The transmitter / receiver unit 120 (transmission processing unit 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.

[0189] The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

[0190] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] The transceiver 120 may transmit one Downlink Control Information (DCI) for one or more Physical Uplink Shared Channels (PUSCHs). The controller 110 may control reception of a plurality of PUSCHs using a plurality of SRS Resource Indicators (SRIs), or reception of one or more PUSCHs using a single SRI, to which a Transmitted Precoding Matrix Indicator (TPMI) and a transmission rank are applied based on one or more pieces of information indicating a TPMI and a transmission rank for the PUSCH, which are included in the DCI (first and second embodiments).

[0196] (User Terminal) Fig. 10 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 transceiver 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 transceiver antenna 230.

[0197] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, 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.

[0198] 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, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

[0199] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may 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.

[0200] 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 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.

[0201] 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.

[0202] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0203] 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.

[0204] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0205] The transceiver unit 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.

[0206] The transmitter / receiver unit 220 (transmission processing unit 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.

[0207] 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 if not, it may not be necessary to perform DFT processing as the transmission processing.

[0208] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0209] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.

[0210] The transceiver unit 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, and acquire user data, etc.

[0211] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, 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.

[0212] Note that the transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0213] The transceiver 220 may receive one Downlink Control Information (DCI) for one or more Physical Uplink Shared Channels (PUSCHs). The controller 210 may control application of a Transmitted Precoding Matrix Indicator (TPMI) and a transmission rank for the PUSCH, which are included in the DCI and indicate one or more pieces of information indicating a TPMI and a transmission rank, to transmission of multiple PUSCHs using multiple SRS Resource Indicators (SRIs) or transmission of one or more PUSCHs using a single SRI (first and second embodiments).

[0214] The control unit 210 may determine whether to apply the TPMI and the transmission rank using a specific correspondence relationship set using higher layer signaling (first and second embodiments).

[0215] When a UE (terminal) is configured to transmit multiple PUSHs using the multiple SRIs, the control unit 210 may determine the TPMI and the transmission rank corresponding to each PUSH among the multiple PUSHs (second embodiment).

[0216] When a UE (terminal) is configured to transmit one or more PUSCHs using the single SRI, the control unit 210 may determine the TPMI and the transmission rank to be applied to the PUSCHs using the single SRI (second embodiment).

[0217] (Hardware Configuration) Note that 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 be realized by combining software with the single device or the multiple devices.

[0218] 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 described above, the implementation method of each is not particularly limited.

[0219] 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. 11 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.

[0220] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used 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.

[0221] 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.

[0222] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified 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.

[0223] 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), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0224] 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 implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0225] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0226] Storage 1003 is a computer-readable recording medium and may be composed of 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, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0227] 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.

[0228] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0229] 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.

[0230] 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 this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0231] (Modifications) Note that terms described 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.

[0232] 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.

[0233] 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, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0234] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0235] 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.

[0236] 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.

[0237] 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 the subframe and the 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.

[0238] 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. Note that the definition of TTI is not limited to this.

[0239] 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.

[0240] 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.

[0241] 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.

[0242] 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 greater than or equal to 1 ms.

[0243] 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 be determined based on numerology.

[0244] 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, each of which may be composed of one or more resource blocks.

[0245] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0246] 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.

[0247] A Bandwidth Part (BWP), which may also be referred to as a partial 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 BWP and numbered within the BWP.

[0248] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0249] 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."

[0250] 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.

[0251] 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.

[0252] 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.

[0253] 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.

[0254] 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.

[0255] 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.

[0256] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the 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.

[0257] Note that the physical layer signaling may be referred to as 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 referred to as 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).

[0258] 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).

[0259] 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).

[0260] 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.

[0261] 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), these wired and / or wireless technologies are included within the definition of transmission media.

[0262] 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).

[0263] 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.

[0264] In the present disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0265] 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 partitioned 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 terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0266] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0267] 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.

[0268] At least one of the base station and the mobile station may be referred to as 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 body, the mobile body itself, etc. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (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.

[0269] 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.

[0270] 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.

[0271] 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), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0272] 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 particular order presented.

[0273] Each aspect / embodiment described in the present disclosure may be a technology other than 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 decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are based on these and are extended thereto. In addition, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0274] 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."

[0275] 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.

[0276] 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.

[0277] 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.

[0278] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "deciding" some action.

[0279] Furthermore, "judgment (decision)" may be read as "assuming," "expecting," "considering," or the like.

[0280] 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."

[0281] 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.

[0282] 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."

[0283] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0284] 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.

[0285] 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.

[0286] This application is based on Japanese Patent Application No. 2021-011131, filed on January 27, 2021, the entire contents of which are incorporated herein by reference.

Claims

1. A transmitter that transmits capability information indicating that a first upper layer parameter that sets a maximum transmission rank number for a first physical uplink shared channel (PUSCH) repeated transmission using a single transmission / reception point (TRP) and a second upper layer parameter that sets a maximum transmission rank number for a second PUSCH repeated transmission using multiple TRPs are different; A receiving unit that receives one downlink control information (DCI) for the first PUSCH repeated transmission or the second PUSCH repeated transmission; A terminal having a control unit that controls application of a transmit precoding matrix indicator (TPMI) and a transmission rank to the first PUSH repeated transmission or the second PUSH repeated transmission based on one or more pieces of information indicating a TPMI and a transmission rank included in the DCI.

2. A step of transmitting capability information indicating that a first upper layer parameter setting a maximum transmission rank number for a first physical uplink shared channel (PUSCH) repeated transmission using a single transmission / reception point (TRP) and a second upper layer parameter setting a maximum transmission rank number for a second PUSCH repeated transmission using multiple TRPs are different; receiving one DCI for the first PUSCH repeated transmission or the second PUSCH repeated transmission; and controlling application of a transmit precoding matrix indicator (TPMI) and a transmission rank to the first PUSCH repeat transmission or the second PUSCH repeat transmission based on one or more pieces of information indicating a TPMI and a transmission rank included in the DCI.

3. A receiving unit that receives capability information indicating that a first upper layer parameter that sets a maximum transmission rank number for a first physical uplink shared channel (PUSCH) repeated transmission using a single transmitting / receiving point (TRP) and a second upper layer parameter that sets a maximum transmission rank number for a second PUSCH repeated transmission using multiple TRPs are different from each other; A transmitter that transmits one downlink control information (DCI) for the first PUSCH repeated transmission or the second PUSCH repeated transmission; A base station comprising: a control unit that controls reception of the first PUSH repeated transmission or the second PUSH repeated transmission, to which a transmit precoding matrix indicator (TPMI) and a transmission rank are applied based on one or more pieces of information indicating the TPMI and the transmission rank, which are included in the DCI.

4. A system having a terminal and a base station, The terminal includes: A transmitter that transmits capability information indicating that a first upper layer parameter for setting a maximum transmission rank number for a first physical uplink shared channel (PUSCH) repeat transmission using a single transmission / reception point (TRP) and a second upper layer parameter for setting a maximum transmission rank number for a second PUSCH repeat transmission using multiple TRPs are different from each other. A receiving unit that receives one downlink control information (DCI) for the first PUSCH repeated transmission or the second PUSCH repeated transmission; A control unit that controls application of a transmission precoding matrix indicator (TPMI) and a transmission rank to the first PUSCH repeated transmission or the second PUSCH repeated transmission based on one or more pieces of information indicating a transmission precoding matrix indicator (TPMI) and a transmission rank included in the DCI, The base station, The system includes a receiver for receiving the capability information.