CN116982374A - Terminal, wireless communication method and base station - Google Patents

Abstract

The terminal according to one aspect of the present disclosure includes: and a control unit that determines, based on the number of repetitions indicated by the information on the number of repetitions, a correlation between a transmission precoding matrix indicator (Transmitted Precoding Matrix Indicator (TPMI)) and a transmission rank for use in transmission of the PUSCH and a value of a TPMI field of 1 or more included in the DCI.

Description

Terminal, wireless communication method and base station

Technical Field

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

Background

In a universal mobile telecommunications system (Universal Mobile Telecommunications System (UMTS)) network, long term evolution (Long Term Evolution (LTE)) has been standardized for the purpose of further high-speed data rates, low latency, and the like (non-patent document 1). Further, for the purpose of further increasing capacity, height, and the like of LTE (third generation partnership project (Third Generation Partnership Project (3 GPP)) Release (rel.)) versions 8 and 9, LTE-Advanced (3 GPP rel.10-14) has been standardized.

Subsequent systems of LTE (e.g., also referred to as fifth generation mobile communication system (5 th generation mobile communication system (5G)), 5g+ (plus), sixth generation mobile communication system (6 th generation mobile communication system (6G)), new Radio (NR)), 3gpp rel.15 later, and the like are also being studied.

Prior art literature

Non-patent literature

Non-patent document 1:3GPP TS 36.300V8.12.0"Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); overall description; stage 2 (Release 8) ", 4 th 2010

Disclosure of Invention

Problems to be solved by the invention

In 3gpp rel.15, repeated transmission is supported for a data channel of UL, for example, an uplink shared channel (physical uplink shared channel (Physical Uplink Shared Channel (PUSCH)). The UE performs control such that PUSCH transmission is performed across a plurality of slots (for example, K consecutive slots) based on a repetition factor K set from a network (for example, a base station). That is, when repeating transmission, each PUSCH is transmitted in a different slot (for example, in slot units).

On the other hand, after rel.16, it is studied to perform PUSCH transmission for a plurality of times within 1 slot when PUSCH transmission is repeated. That is, the PUSCH is transmitted in units shorter than the slots (for example, sub-slot units and mini-slot units).

Further, after rel.16, it is being studied to dynamically switch between single PUSCH transmission and repeated PUSCH transmission.

Further, in NR, communication using one or a plurality of Transmission/Reception points (TRP) is being studied.

However, in the NR specifications so far, how to control the repeated transmission of PUSCH in a multi-panel/TRP has not been fully studied. If the repeated transmission of PUSCH in the multi-TRP is not performed properly, there is a possibility that the throughput is degraded or the communication quality is deteriorated.

Accordingly, an object of the present disclosure is to provide a terminal, a wireless communication method, and a base station capable of appropriately controlling PUSCH repetition transmission.

Means for solving the problems

The terminal according to one aspect of the present disclosure includes: a reception unit that receives one piece of downlink control information (Downlink Control Information (DCI)) for 1 or more repeated transmissions of an uplink shared channel (physical uplink shared channel (Physical Uplink Shared Channel (PUSCH)) and information on the number of repetitions of the PUSCH; and a control unit configured to determine, based on the number of repetitions indicated by the information on the number of repetitions, an association between a transmission precoding matrix indicator (Transmitted Precoding Matrix Indicator (TPMI)) and a transmission rank for application to transmission of the PUSCH, and values of 1 or more TPMI fields included in the DCI.

Effects of the invention

According to an aspect of the present disclosure, PUSCH repeated transmission can be appropriately controlled even in the case of applying multi-TRP.

Drawings

Fig. 1A and 1B are diagrams illustrating an example of repeated PUSCH transmission.

Fig. 2A and 2B are diagrams showing an example of an invalid symbol pattern.

Fig. 3A and 3B are diagrams showing an example of a nominal iteration (Nominal repetitions) and an actual iteration (Actual repetitions).

Fig. 4 is a diagram showing an example of repeated PUSCH transmission in a multi-TRP.

Fig. 5A and 5B are diagrams showing an example of the association between the SRI field and the SRS resource in rel.16.

Fig. 6A and 6B are diagrams showing other examples of the association between the SRI field and the SRS resource in rel.16.

Fig. 7 is a diagram showing an example of association between TPMI field and SRS resource in rel.16.

Fig. 8A and 8B are diagrams illustrating an example of the association between the SRI field and the SRS resource.

Fig. 9 is a diagram showing an example of an indication method of the SRI field according to the first embodiment.

Fig. 10 is a diagram showing another example of the method for indicating the SRI field according to the first embodiment.

Fig. 11 is a diagram showing an example of association with a TPMI field according to the second embodiment.

Fig. 12 is a diagram showing an example of a method for indicating a TPMI field according to the second embodiment.

Fig. 13 is a diagram showing another example of the TPMI field indication method according to the second embodiment.

Fig. 14 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.

Fig. 15 is a diagram showing an example of a configuration of a base station according to an embodiment.

Fig. 16 is a diagram showing an example of a configuration of a user terminal according to an embodiment.

Fig. 17 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment.

Detailed Description

(repeated transmission)

In rel.15, repeated transmission is supported in data transmission. For example, the base station (network (NW), gNB) repeats transmission of DL data (e.g., downlink shared channel (PDSCH)) a certain number of times. Alternatively, the UE repeats transmission of UL data (e.g., uplink shared channel (PUSCH)) a specific number of times.

Fig. 1A is a diagram illustrating an example of repeated PUSCH transmission. Fig. 1A shows an example in which a specific number of repeated PUSCHs are scheduled by a single DCI. The number of repetitions is also referred to as the repetition factor (repetition factor ) K or the aggregation factor (aggregation factor ) K.

In fig. 1A, the repetition coefficient k=4, but the value of K is not limited thereto. The nth repetition is also called an nth transmission opportunity (transmission timing, transmission occasion) or the like, and can be identified by a repetition index K (0.ltoreq.k.ltoreq.k-1). In fig. 1A, the repeated transmission of the PUSCH dynamically scheduled by DCI (e.g., PUSCH based on dynamic grant) is shown, but the present invention is applicable to repeated transmission of PUSCH based on set grant.

For example, in fig. 1A, the UE semi-statically receives information (e.g., aggregation factor ul or aggregation factor dl) representing the repetition coefficient K through higher layer signaling. Here, the higher layer signaling may be, for example, one of RRC (radio resource control (Radio Resource Control)) signaling, MAC (medium access control (Medium Access Control)) signaling, broadcast information, or the like, or a combination thereof.

For example, a MAC Control Element (MAC CE), a MAC PDU (protocol data unit (Protocol Data Unit)), or the like may be used for the MAC signaling. The broadcast information may be, for example, a master information block (MIB: master Information Block), a system information block (SIB: system Information Block), minimum system information (remaining minimum system information, RMSI: remaining Minimum System Information), or the like.

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

allocation of time domain resources (e.g., starting symbols, number of symbols in each slot, etc.)

Allocation of frequency domain resources (e.g., a specific number of Resource Blocks (RBs), a specific number of Resource Block groups (RBGs: resource Block Group)),

Modulation and coding scheme (MCS: modulation and Coding Scheme) index,

Structure (configuration) of PUSCH demodulation reference signal (DMRS: demodulation Reference Signal),

Spatial relationship information (spatial relation info) of PUSCH or a transmission configuration indication (TCI: transmission setting indication (Transmission Configuration Indication) or transmission setting indicator (Transmission Configuration Indicator)), and a status (TCI status).

The same symbol allocation may also be applied between consecutive K slots. In fig. 1A, a case where PUSCH in each slot is allocated to a specific number of symbols from the beginning of the slot is shown. The same symbol allocation among slots may also be determined as described in the above-described time domain resource allocation.

For example, the UE may determine symbol allocation in each slot based on a start symbol S determined based on a value m of a specific field (e.g., a Time Domain Resource Allocation (TDRA) field) in the DCI and a symbol number L (e.g., a start and length indicator (Start and Length Indicator (SLIV))). The UE may determine the first slot based on K2 information determined based on the value m of the specific field (e.g., TDRA field) of the DCI.

On the other hand, the redundancy versions (Redundancy Version (RV)) applied to the TBs based on the same data may be the same or may be at least partially different among the consecutive K slots. For example, the RV applied to the TB in the nth slot (transmission opportunity, repetition) may also be determined based on the value of a specific field (e.g., RV field) within the DCI.

Resources allocated in consecutive K slots may not be transmitted (or not received) in a case where communication directions are different on at least one symbol, as compared to UL, DL, or Flexible (Flexible) of each slot designated by at least one of slot format identifiers (slot format indicator ) of DCI (e.g., DCI format 2_0) and "TDD-UL-DL-ConfigCommon" of RRC IE and "TDD-UL-DL-configdediated" of TDD control.

In rel.15, PUSCH is repeatedly transmitted across a plurality of slots (in slot units) as shown in fig. 1A, but in rel.16 and thereafter, PUSCH is repeatedly transmitted in units shorter than slots (for example, sub-slot units, mini-slot units, or specific symbol number units) is assumed (see fig. 1B).

In fig. 1B, the repetition coefficient k=4, but the value of K is not limited thereto. The nth repetition is also called an nth transmission opportunity (transmission timing, transmission occasion) or the like, and can be identified by a repetition index K (0.ltoreq.k.ltoreq.k-1). In fig. 1B, the repeated transmission of the PUSCH dynamically scheduled by DCI (e.g., PUSCH based on dynamic grant) is shown, but the present invention is applicable to repeated transmission of PUSCH based on set grant.

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

The UE may also dynamically receive information (e.g., numberofrepetition) indicating the repetition coefficient K through the downlink control information. The repetition coefficient may also be determined based on a value m of a specific field (e.g., TDRA field) within the DCI. For example, a table defining a correspondence relationship between the bit value notified by DCI and the repetition coefficient K, the start symbol S, and the symbol number L may be supported.

The time slot based retransmission illustrated in fig. 1A may also be referred to as a retransmission type a (e.g., PUSCH repetition Type A), and the sub-slot based retransmission illustrated in fig. 1B may also be referred to as a retransmission type B (e.g., PUSCH repetition Type B). In addition, in the present disclosure, the repetition transmission type and the repetition type may be replaced with each other.

For the UE, an application of at least one of the repeated transmission type a and the repeated transmission type B may be set. For example, the type of repeated transmission applied by the UE may also be notified from the base station to the UE through higher layer signaling (e.g., pulseptypeindicator).

One of the retransmission type a and the retransmission type B may be set for the UE for each DCI format for scheduling PUSCH.

For example, for a first DCI format (e.g., DCI format 0_1), when higher layer signaling (e.g., pusceptyptype indicator-aordcifomat 0_1) is set to a retransmission type B (e.g., PUSCH-retransmission type B), the UE applies the retransmission type B to PUSCH retransmission scheduled by the first DCI format. In other cases (for example, in the case where PUSCH-RepTypeB is not set or in the case where PUSCH-RepTypA is set), the UE applies the retransmission type a to PUSCH retransmission scheduled by the UE in the first DCI format.

Further, after rel.16, dynamic switching between single PUSCH transmission and repeated PUSCH transmission is being studied.

When setting a higher layer parameter (for example, PUSCH-time domain allocation list dci-0-1-r16 or PUSCH-time domain allocation list dci-0-2-r 16) for the UE, the number of repetitions (for example, 1, 2, 3, 4, 7, 8, 12, or 16) may be set by a parameter (for example, number of repetitions of PUSCH) included in the higher layer parameter. The UE may determine the number of repetitions of PUSCH scheduled by DCI based on a Time Domain Resource Allocation (TDRA) field of the DCI. When the repetition number is set/designated to 1, the UE may perform single PUSCH transmission.

(invalid symbol pattern)

It is also studied to notify the UE of information on a symbol (or symbol pattern) that cannot be used for PUSCH transmission when the repetition transmission type B is applied for PUSCH transmission. Symbol patterns that cannot be used for PUSCH transmission may also be referred to as invalid symbol patterns, invalid symbol pattern, unacknowledged symbol patterns, and the like.

It is being studied to notify an invalid symbol pattern using at least one of higher layer signaling and DCI. The DCI may also be a specific DCI format (e.g., at least one of DCI formats 0_1 and 0_2).

For example, the UE is notified of information on an invalid symbol pattern that cannot be used for PUSCH transmission, using the first higher layer parameters. The UE may be notified of the presence or absence of application of the information related to the invalid symbol pattern by DCI. In this case, a bit field (notification field for notifying the presence or absence of the application of the invalid symbol pattern) for indicating the presence or absence of the application of the information related to the invalid symbol pattern may be set in the DCI.

Further, the presence or absence of setting of the notification field (or additional bit) in the DCI may be notified to the UE by using the second higher layer parameter. That is, when information on an invalid symbol pattern is notified by a first high-layer parameter, the UE may determine whether or not to apply the information on the invalid symbol pattern based on a second high-layer parameter and DCI.

In the case where the first higher layer parameter is not notified or set, the UE may control PUSCH transmission without considering the invalid symbol pattern. When the first higher layer parameter is notified or set, the UE may determine whether or not to apply the invalid symbol pattern based on the second higher layer parameter and the DCI. For example, when the second higher layer parameter indicates that an additional bit (or a specific field) for indicating the presence or absence of application of the invalid symbol pattern is added to the DCI, the UE may determine the presence or absence of application of the invalid symbol pattern based on the specific field.

The first higher layer parameter may be information for notifying a symbol pattern that is invalid during PUSCH transmission, and may be, for example, a bitmap (see fig. 2A). Fig. 2A is a diagram showing an example of defining an invalid symbol pattern for a time domain passing bitmap (1-D bitmap). The UE may determine resources available for PUSCH transmission in 1 or more bandwidth (e.g., BWP) based on the information on the invalid symbol pattern (see fig. 2B).

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

(nominal iteration (Nominal repetitions)/actual iteration (Actual repetitions))

When the repeated transmission type B is applied to repeat transmission in sub-slot units, a certain repeated transmission may cross (cross) slot boundaries (slot-boundary) depending on the repetition coefficient (K), the data allocation unit, and the like.

Fig. 3A shows an example of the repetition transmission type B when the repetition coefficient (K) is 4 and the PUSCH length (L) is 4. In fig. 3A, PUSCH of k=3 is configured across slot boundaries. In this case, PUSCH may be divided (or segmented) based on the slot boundary and transmitted (see fig. 3B).

Further, a case is also envisaged in which symbols (for example, DL symbols or invalid symbols, etc.) that cannot be used for PUSCH transmission are contained in a slot. Fig. 3A shows a case where a part of symbols in which PUSCH of k=1 is allocated includes symbols (here, DL symbols) which cannot be transmitted by the PUSCH. In this case, PUSCH transmission may be performed using symbols other than the DL symbol (see fig. 3B).

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

Fig. 3B shows a case where the PUSCH of k=1 (rep#2) is divided into 2 pieces (rep#2-1 and # 2-2) by DL symbols and the PUSCH of k=3 (rep#4) is divided into 2 pieces (rep#4-1 and # 4-2) by slot boundaries in repeated transmission by sub-slots.

In addition, considering the repetition transmission before DL symbols, invalid symbols, or slot boundaries (fig. 3A) may also be referred to as nominal repetition (Nominal repetitions). Repeated transmissions that take into account DL symbols, invalid symbols, or slot boundaries (fig. 3B) may also be referred to as actual repetitions (Actual repetitions).

(spatial relation for SRS and PUSCH)

In rel.15nr, the UE may also receive information (SRS setting information, e.g., parameters in "SRS-Config" of an RRC control element) for transmission of a measurement reference signal (e.g., a sounding reference signal (Sounding Reference Signal (SRS)).

Specifically, the UE may also receive at least one of information on one or more SRS Resource sets (SRS Resource set information, e.g., "SRS-Resource" of the RRC control element) and information on one or more SRS resources (SRS Resource information, e.g., "SRS-Resource" of the RRC control element).

A set of SRS resources may also be associated with a particular number of SRS resources (a particular number of SRS resources may also be combined into a group). Each SRS resource may be determined based on an SRS resource Identifier (SRS resource indicator, SRS Resource Indicator (SRI)) or an SRS resource ID (Identifier).

The SRS resource set information may include information of an SRS resource set ID (SRS-resource ID), a list of SRS resource IDs (SRS-resource ID) used in the resource set, an SRS resource type (for example, one of periodic SRS (Periodic SRS), semi-Persistent SRS (Semi-Persistent SRS), and aperiodic CSI (Aperiodic SRS)), and a use (use) of the SRS.

Here, the SRS resource type may be one of Periodic SRS (P-SRS), semi-Persistent SRS (SP-SRS), and Aperiodic CSI (a-SRS). In addition, the UE may also periodically (or periodically after activation) transmit P-SRS and SP-SRS and transmit A-SRS based on the SRS request of the DCI.

The usage (usage of RRC parameter, "SRS-SetUse" of L1 (Layer-1) parameter) may be, for example, beam management (beam management), codebook (CB), non-codebook (noncodebook (NCB)), antenna switching, or the like. The SRS for codebook or non-codebook use may also be used to decide a precoder for PUSCH transmission based on a codebook or non-codebook according to SRI.

For example, in the case of codebook-based transmission, the UE may determine a precoder for PUSCH transmission based on SRI, transmission rank indicator (Transmitted Rank Indicator (TRI)), and transmission precoding matrix indicator (Transmitted Precoding Matrix Indicator (TPMI)). In the case of non-codebook based transmission, the UE may also decide a precoder for PUSCH transmission based on SRI.

The SRS resource information may also include SRS resource ID (SRS-resource ID), number of SRS ports, SRS port number, transmission combs, SRS resource map (e.g., time and/or frequency resource location, resource offset, period of resources, number of repetitions, number of SRS symbols, SRS bandwidth, etc.), hopping association information, SRS resource type, sequence ID, spatial relationship information of SRS, etc.

Spatial relationship information of the SRS (e.g., "spatlrelationinfo" of the RRC information element) may also represent spatial relationship information between a specific reference signal and the SRS. The particular reference signal may also be at least one of a synchronization signal/broadcast channel (Synchronization Signal/Physical Broadcast Channel (SS/PBCH)) block, a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and an SRS (e.g., other SRS). The SS/PBCH block may also be referred to as a Synchronization Signal Block (SSB).

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

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

The spatial relationship information of the SRS may include a serving cell index, a BWP index (BWP ID), and the like corresponding to the specific reference signal.

When spatial relationship information about SSB, CSI-RS, or SRS is set for a certain SRS resource, the UE may transmit the SRS resource using the same spatial domain filter (spatial domain transmission filter) as the spatial domain filter (spatial domain reception filter) for receiving the SSB or CSI-RS. In this case, the UE may also assume that the UE reception beam of the SSB or CSI-RS is the same as the UE transmission beam of the SRS.

When spatial relationship information about another SRS (reference SRS) and the SRS (target SRS) is set for a certain SRS (target SRS) resource, the UE may transmit the target SRS resource using the same spatial domain filter (spatial domain transmission filter) as the spatial domain filter (spatial domain transmission filter) used for transmitting the reference SRS. That is, in this case, the UE may assume that the UE transmission beam of the reference SRS and the UE transmission beam of the target SRS are the same.

The UE may also determine the spatial relationship of PUSCH scheduled through the DCI based on the value of a specific field (e.g., SRS Resource Identifier (SRI) field) within the DCI (e.g., DCI format 0_1). Specifically, the UE may use spatial relationship information (e.g., "spatlrelationinfo" of the RRC information element) of SRS resources determined based on the value (e.g., SRI) of the specific field for PUSCH transmission.

In the case of using codebook-based transmission for PUSCH, the UE may also be set with 2 SRS resources for each SRS resource set through RRC and indicated with one of the 2 SRS resources through DCI (1-bit SRI field). In the case of using non-codebook based transmission for PUSCH, the UE may also be set with 4 SRS resources per SRS resource set through RRC and indicated with one of the 4 SRS resources through DCI (2-bit SRI field).

(TPMI and transmission rank)

In rel.16, a transmission precoding matrix indicator (Transmitted Precoding Matrix Indicator (TPMI)) and a transmission rank (may also be referred to as a transmission layer) for codebook-based PUSCH transmission are being studied to be specified by specific fields (e.g., precoding information and layer number fields) included in downlink control information (e.g., DCI format 0_1). In addition, in the present disclosure, rank may also be interchanged with layer.

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

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 represented by the nrofSRS-Ports described above), and several higher layer parameters.

In the case where a higher layer parameter (e.g., txConfig) set for the UE is set to a non-codebook (non codebook), the specific field may be 0 bit.

In addition, in a case where a higher layer parameter (for example, txConfig) set for the UE is set to a codebook (codebook) for one antenna port, the specific field may be 0 bit.

In addition, in a case where a higher layer parameter (for example, txConfig) set for the UE is set to a codebook (codebook) for 4 antenna ports, the specific field may have a bit length of 2 to 6 bits according to at least one of the presence or absence (valid or invalid) of other higher layer parameters set for the UE and the conversion precoder.

In addition, in a case where a higher layer parameter (for example, txConfig) set for the UE is set to a codebook (codebook) for 2 antenna ports, the specific field may have a bit length of 1 to 4 bits according to at least one of the presence or absence (valid or invalid) of other higher layer parameters set for the UE and the conversion precoder.

The other higher layer parameter may also be at least one of a parameter (e.g., UL-FullPowerTransmission, UL-fullpower transmission-r 16) for specifying a full power transmission mode of UL, a parameter (e.g., maxRank) representing a maximum value of a transmission rank of UL, a parameter (e.g., codebook subset) representing a subset of a certain Precoding Matrix Indicator (PMI), and a parameter (e.g., transform precoder) for specifying a transform precoder.

In rel.16, when there is a PUSCH repetition transmission for PUSCH repetition type a, the number of transmission layers (transmission rank) of the PUSCH transmission is limited to 1.

Fig. 5A, 5B, 6A, and 6B are diagrams illustrating an example of the association between the SRI field and the SRS resource in rel.16. Fig. 5A, 5B, 6A, and 6B show the association of maximum numbers (Lmax) 1, 2, 3, 4 for transmission ranks, respectively. In non-codebook based MIMO, SRI (field) ("bit field mapped to index (Bit field mapped to index)") is used to indicate spatial relationship of PUSCH and the number of transmission layers (rank, port). In the case of performing repeated transmission of the repetition type a of PUSCH in which the transmission rank is defined as 1, several entries (entries) included in the association are not used. That is, in the case where the (maximum) transmission rank (layer, port) is defined as 1, an entry for indicating a plurality of transmission ranks is not used.

Fig. 7 is a diagram showing an example of association between TPMI field and SRS resource in rel.16. For the precoding information and layer number field ("bit field mapped to index (Bit field mapped to index)") contained in the DCI, the layer number and TPMI are associated. In codebook-based MIMO, SRI (field) is used to indicate spatial relationship, and TPMI (field) is used to indicate the transmission rank number of PUSCH (using codebook). In the case of performing repeated transmission of the repetition type a of PUSCH such that the transmission rank is defined as 1, several items included in the association are not used. That is, in the case where the (maximum) transmission rank (layer, port) is defined as 1, an entry for indicating a plurality of transmission ranks is not used.

(multiple TRP)

In NR, one or more Transmission/Reception points (TRPs)) are being studied to DL transmit a UE using one or more panels (multi-panels). In addition, the UE is under study to perform UL transmission on one or more TRPs (refer to fig. 4).

The plurality of TRPs may correspond to the same cell identifier (cell Identifier (ID)) or may correspond to different cell IDs. The cell ID may be either a physical cell ID or a virtual cell ID.

After rel.17, repeated transmission of PUSCH for a plurality of TRPs using a single DCI (PUSCH repetition of M-TRP based on a single DCI, single DCI based M-TRPPUSCH repetition) is being studied.

Further, after rel.17, studies are being made to support dynamic switching between PUSCH repetition transmission for a plurality of TRPs and PUSCH transmission for a single TRP. Repeated transmission of PUSCH for a plurality of TRPs may also mean repeated transmission using a plurality of slots. PUSCH transmission for a single TRP may also mean single PUSCH transmission, PUSCH transmission with a single slot, repeated PUSCH transmission for a single TRP with multiple slots.

After rel.17, when repeated is scheduled for repeated transmission of PUSCH of repetition type a plurality of times, the result of limiting the number of transmission ranks (layers) to 1 is to minimize the overhead of DCI for the PUSCH.

The method of instructing (setting) the number of repetitions of PUSCH may be considered as method 1 or method 2 below:

method 1: the number of slots for transmission is set by a higher layer (dynamic switching of the number of repetitions cannot be performed),

Method 2: the number of slots to be used for transmission is set by a higher layer in the association (table) of TDRA (dynamic switching of the number of repetitions can be performed by DCI).

In PUSCH repetition type a, when there is a higher-layer parameter (for example, numberofrepetition-r 16) that sets the number of repetitions for association (table) of resource allocation, the number of repetitions K is dynamically indicated in DCI (meaning that repetition transmission and single transmission are dynamically switched).

In PUSCH repetition type a, in case of K >1, PUSCH is limited to one transmission layer (transmission rank). In the case of k=1, the number of transmission layers is not limited.

In order to minimize the overhead of DCI for PUSCH for multiple TRPs, a limitation of transmission rank (layer) in case of K >1 needs to be considered, and furthermore, dynamic switching between single transmission and repetition of repetition type a for PUSCH needs to be considered. However, studies on dynamic switching between such transmission ranks, single transmissions, and repetition are insufficient. If these studies are insufficient, there is a possibility that the repeated transmission of PUSCH among a plurality of TRPs is not properly performed, the throughput is degraded or the communication quality is deteriorated, and the signaling overhead of DCI is increased.

Accordingly, the inventors of the present invention have devised a control method for PUSCH repetition transmission that solves the above-described problems.

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

In addition, in the present disclosure, ports, panels, beams, uplink (UL)) transmitting entities, TRP, spatial Relationship Information (SRI), spatial relationship, control resource set (COntrol REsource SET (CORESET)), PDSCH, codewords, base stations, specific antenna ports (e.g., demodulation reference signal (DeModulation Reference Signal (DMRS)) ports), specific antenna port groups (e.g., DMRS port groups), specific groups (e.g., code division multiplexing (Code Division Multiplexing (CDM)) groups, specific reference signal groups, CORESET groups, panel groups, beam groups, spatial relationship groups, PUCCH groups), CORESET pools may also be replaced with each other. In addition, the panel identifier (Identifier (ID)) and the panel may also be interchanged. TRP ID and TRP may also be replaced with each other.

In this disclosure, the index, ID, indicator, resource ID may also be replaced with each other.

In the present disclosure, "a/B" may also mean "at least one of a and B". Further, in the present disclosure, "a/B/C" may also mean at least one of "A, B and C".

In this disclosure, lists, groups, clusters, subsets, etc. may also be substituted for each other. In the present disclosure, spatial relationship information (Spatial Relation Information (SRI)), SRS resource indicator (SRS Resource Indicator (SRI), (or SRI field)), SRS resources, precoders, and the like may also be replaced with each other.

In this disclosure, spatial Relationship Information (SRI), combinations of SRIs, SRIs for codebook-based transmission, combinations of non-codebook-based SRIs, spatial relationship information (spatial relationship info), UL TCI, TCI status, unified TCI (Unified TCI), QCL, etc. may also be substituted for each other.

In the present disclosure, the first TRP and the second TRP may also be interchanged with the first PUSCH and the second PUSCH, the first PUSCH transmission opportunity and the second PUSCH transmission opportunity, the first SRI and the second SRI, and the like.

In the present disclosure, transmission rank, transmission layer, rank number, number of layers, maximum transmission rank, maximum transmission layer, maximum value of transmission rank, TPMI candidate number, TPMI number, maximum TPMI number, transmission rank of UL, maximum value of transmission rank of UL, and the like may be replaced with each other. In addition, in the present disclosure, precoding information and layer number fields, TPMI fields, TPMI values, and the like may also be replaced with each other.

The repeated transmission of PUSCH using a plurality of TRPs in the following embodiments may be replaced with PUSCH using a plurality of TRPs, PUSCH for a plurality of TRPs, PUSCH spanning a plurality of TRPs, repeated PUSCH spanning a plurality of TRPs, abbreviated as repeated PUSCH, repeated transmission, PUSCH transmission using a plurality of SRIs, multi-slot transmission, or the like.

Further, PUSCH transmission using a single TRP may also be referred to as PUSCH transmission using a single TRP, PUSCH repetition transmission for a single TRP, PUSCH at a single TRP, PUSCH repetition at a single TRP, single PUSCH transmission for a single TRP, PUSCH transmission in a single TRP, PUSCH transmission using a single SRI, single transmission, 1 slot transmission, or the like.

In the present disclosure, repeated transmission of PUSCH for a single TRP may also mean repeated transmission of multiple PUSCHs transmitted with the same SRI/beam/precoder.

In the embodiments of the present disclosure, PUSCH transmission for single or multiple TRPs using one DCI and PUSCH transmission based on a codebook or a non-codebook are described as UL transmission, but PUSCH transmission according to the embodiments is not limited to these. Further, common or different embodiments may also be applied in codebook-based PUSCH transmission and non-codebook-based PUSCH transmission. The UL transmission is not limited to PUSCH, and various embodiments of the present disclosure can be suitably applied to PUCCH (PUSCH may be replaced by PUCCH).

In the embodiments of the present disclosure, the case where the number of TRPs, SRIs, and the like is 2 is mainly described, but the number may be 3 or more. Further, "dynamic handover" in the present disclosure may also mean "handover with at least one of higher layer signaling and physical layer signaling". In addition, the "switch" of the present disclosure may be replaced with a switch (switching), a change (change), a conversion, an application, an instruction, a setting, or the like.

In addition, in the present disclosure, repeated transmission of PUSCH with a single TRP and repeated transmission of PUSCH with a plurality of TRPs may also be dynamically instructed/switched by DCI. In this dynamic switching, a specific field included in the DCI defined up to rel.16 may be used, or a specific field defined after rel.17 may be used.

(Wireless communication method)

In each embodiment of the present disclosure, a case where the repetition type a of PUSCH is set for the UE will be described. The embodiments of the present disclosure are not limited to the case of setting the repetition type a of PUSCH, but can be suitably applied to any type of repetition transmission.

In embodiments of the present disclosure, there is a higher-layer parameter (e.g., numberofrepetition-r 16) in the association (table) of resource allocation for setting the number of repetitions, which may also mean dynamically indicating the number of repetitions with DCI.

In embodiments of the present disclosure, repeated transmission of PUSCH for multiple TRPs may also be supported by UE capability and set to active (enabled) by higher layer signaling. In the non-codebook based PUSCH transmission, a plurality of (e.g., 2) SRI fields corresponding to a plurality of (e.g., 2) SRS resource sets may be included in a specific DCI format (e.g., DCI format 0_1/0_2). In the codebook-based PUSCH transmission, a plurality of (e.g., 2) SRI fields corresponding to a plurality of (e.g., 2) SRS resource sets may be included in a specific DCI format (e.g., DCI format 0_1/0_2), and a plurality of (e.g., 2) TPMI fields may be included in the specific DCI format.

< first embodiment >

For PUSCH transmission based on non-codebook, the UE may also determine for a plurality (e.g., 2) of SRI field values based on the number of repetitions indicated/set. For example, in the case where the number of repetitions k=1 is indicated to the UE and the case where the number of repetitions K >1 is indicated, the UE may also interpret the indicated SRI field value as different.

In the case where the number of repetitions K >1 (repeated transmission) is set/indicated for the UE, the UE may apply the association (e.g., table) of the entry including the single SRS resource to the correspondence (mapping) between the SRI field and the SRS resource (embodiment 1-1).

For example, when the number of repetitions K >1 is set/indicated for the UE, the UE may determine that the association of the entry including only a single SRS resource is applied to the correspondence between the SRI field and the SRS resource. In other words, in embodiment 1-1, when the UE is set to and instructs the repetition number K >1 (repeated transmission), the SRI field may refer to a table of entries relating only a single SRS resource, and the SRS resource may be determined from the SRI field.

The association may be an association including a single SRS resource defined in rel.15 as shown in fig. 5A, or an association including a single SRS resource defined in rel.17 and later. For example, the association may be to indicate K in the repetition type A >1、L _max When=1, 2, 3, or 4, for correspondence (mapping) between the SRI field and SRS resources based on the non-codebook (refer to fig. 8A).

In addition, when dynamic switching between transmission (repeated transmission) for a single TRP and repeated transmission for a plurality of TRPs is indicated by each SRI field, thenEach SRI field may include an entry/code point indicating that the SRI field is not to be applied (an entry/code point not to be applied). In connection with this, K may be indicated in the repetition type A as described above>1、L _max When=1, 2, 3, or 4, for correspondence (mapping) between the SRI field and SRS resources based on the non-codebook (refer to fig. 8B).

In order not to increase the number of blind detections of DCI, in the case of dynamically switching between single transmission (1-slot transmission) and repeated transmission (multi-slot transmission), it is preferable that the payloads (sizes) of DCI are the same in both single transmission and repeated transmission. By using the association as described in the example of fig. 8B, the payload of DCI can be made identical in single transmission and repeated transmission while suppressing an increase in the payload of DCI.

In addition, in the present disclosure, an entry/code point that is Not applied may also be replaced with an entry/code point that cannot be applied, a reserved (reserved) entry/code point, an entry/code point that indicates that no applied (Not applied), and the like. For example, the entry/code point that is not applied may also be a reserved entry/code point in the SRI field in rel.16. In addition, "Not applied" of the present disclosure may also be replaced with "Not Applicable", "Not usable", "N/a", "Not valid", or the like.

The UE may perform repeated transmission of PUSCH for a plurality of TRPs even when a plurality of (e.g., 2) entry/code points (i.e., valid entry/code points) are indicated that are not entry/code points to be applied. In addition, the UE may also perform PUSCH transmission for a single TRP in case of being instructed on one valid entry/code point and an entry/code point that is not applied.

In the case where the number of repetitions k=1 (single transmission) is set/indicated for the UE, the UE may determine the SRS resource to be used/applied based on a plurality of (e.g., 2) SRI fields (embodiments 1 to 2).

For example, when the repetition number k=1 is set/indicated, the UE may determine that the code point formed by the combination of a plurality of (e.g., 2) SRI fields corresponds to the SRS resource. At this time, the UE may determine the SRS resource to be used from the association (e.g., table) between the SRS resource and the SRI field defined up to rel.16. The UE may also replace the bit field ("bit field mapped to index (Bit field mapped to index)") in the associations shown in fig. 5A, 5B, 6A, 6B, etc. with a bit field (code point) composed of a combination of a plurality of SRI fields.

A code point formed by a combination of a plurality of (e.g., 2) SRI fields may be a bit field (bit string) obtained by combining (synthesizing) the plurality of SRI fields (bit strings).

For example, the UE may also determine that (the code point of) the first SRI field for the first TRP is the most significant bit (Most Significant Bit (MSB)) of the code point representing the combination of the plurality of SRI fields (or a specific number (e.g., 2) of bits from the most significant bit). Further, the UE may also determine that (the code point of) the second SRI field for the second TRP is the least significant bit (Least Significant Bit (LSB)) of the code point representing the combination of the plurality of SRI fields (or a specific number (e.g., 2) of bits from the least significant bit). In addition, in the present disclosure, MSBs and LSBs may also be replaced with each other.

In addition, in the present disclosure, an example indicating a combination of code points of 2 SRI/TPMI is shown, but 3 or more code points of SRI/TPMI fields may be combined.

In addition, after rel.17, an association (e.g., table) including entries having 1 or more SRS resources as defined in rel.16 may be defined.

Fig. 9 is a diagram showing an example of an indication method of the SRI field according to the first embodiment. In the drawings of the present disclosure, L is shown below _max ＝2、N _SRS ＝4(N _SRS The number of SRS resources set in the SRS resource set) is used as the SRI-related association, but the application of the embodiments of the present disclosure is not limited to these examples. In fig. 9, the number of iterations K is indicated to the UE >1 (repeated transmission). At this time, the UE decides SRI (here, SRI corresponding to index 2 (10)) based on the code point (here, 10) indicated by the first SRI field (SRI field # 1). Further, the UE is based on the information transmitted through the second SRI field (SRI field # 2) determines the SRI (here, SRI corresponding to index 1 (01) from the indicated code point (here, 01). Next, the UE repeatedly transmits using the SRI corresponding to index 2 as a first SRI and using the SRI corresponding to index 1 as a second SRI, respectively.

Fig. 10 is a diagram showing another example of the method for indicating the SRI field according to the first embodiment. In fig. 10, the number of repetitions k=1 (single transmission) is indicated to the UE. At this time, the UE decides SRI (here, SRI corresponding to index 9 (1001)) based on a combination (here, 1001) of the code point (here, 10) indicated by the first SRI field (SRI field # 1) and the code point (here, 01) indicated by the second SRI field (SRI field # 2). Next, the UE performs a single transmission using the SRI corresponding to the index 9.

If at L _max ＝2、N _SRS When 2 existing SRI fields are used for the case of=4, the bit length of each SRI field is 4 bits, whereas according to the present embodiment, the bit length of each SRI field can be 2 bits, and thus overhead can be reduced. On the other hand, a plurality of TRP (SRI/beam) is not required in the case of k=1, and thus more entries of transmission rank (layer) larger than 1 can be indicated by using a combination of a plurality of (e.g., 2) SRI fields.

In addition, as described above, the case where different associations (tables) are used in the cases of K >1 and k=1 is described, but a common association may be used in the cases of K >1 and k=1. The association may be, for example, an association defined in rel.16 as defined in at least one of fig. 5A, 5B, 6A, and 6B.

When indicating the number of repetitions K >1, the UE may also assume (assume, expect) that an entry corresponding to a single SRS resource is indicated in each SRI field according to the association.

When the number of repetitions k=1 is indicated, the UE may also determine SRS resources from a combination of a plurality (e.g., 2) of SRI fields. A combination of a plurality (e.g., 2) of SRI fields may indicate any entry having 1 or more SRS resources from an association (e.g., an association shown with reference to the example of fig. 5B). In the case of indicating K >1, the SRI corresponding to one of indexes 0 to 3 can be indicated from the association shown in the example of fig. 5B by 2 bits of each SRI field. Further, in the case of indicating k=1, by 4 bits constituted by a combination of a plurality of SRI fields, an SRI corresponding to one of indexes 0 to 16 can be indicated from the association as shown in the example of fig. 5B.

According to the first embodiment described above, the determination of the SRI in consideration of the transmission rank can be appropriately controlled even when the single transmission and the repeated transmission are dynamically switched.

< second embodiment >

For codebook-based PUSCH transmission, the UE may also determine a plurality (e.g., 2) TPMI field values based on the number of repetitions set/indicated. For example, in the case where the number of repetitions k=1 is indicated to the UE and in the case where the number of repetitions K >1 is indicated, the UE may also interpret the indicated TPMI field value as different.

When setting/instructing the number of repetitions K >1 (repeated transmission) to the UE, the UE may apply association (e.g., table) of an entry including layer number 1 and precoding information (may also be referred to as TPMI, TPMI value) corresponding to layer number 1 to correspondence (mapping) between the TPMI field and layer number and precoding information (embodiment 2-1).

For example, when the repetition number K >1 is set or indicated, the UE may apply association between the TPMI field and the layer number and precoding information to the association between the layer number 1 and the entry including only the precoding information (TPMI value) corresponding to the layer number 1. In other words, in embodiment 2-1, when the repetition number K >1 (repeated transmission) is set or indicated, the UE may refer to a table in which only 1 layer and the entry of the corresponding precoding information are associated with the layer number and the precoding information, and determine the layer number and the TPMI from the layer number and the precoding information field.

The association may be an association including layer number 1 and precoding information corresponding to layer number 1, which is defined after rel.17. At this time, the entry included in the association may be reused as an entry included in the existing association defined up to rel.16. The association may be a conventional association of maximum rank 1 (maxrank=1) defined up to rel.16. For example, the association may be an association when: with 4 antenna ports, precoding is converted to inactive (disabled), the maximum rank is 2, 3 or 4 (maxrank=2, 3 or 4), and UL full power transmission (higher layer parameter UL-fullflowertransmission-r 16) is not set, or full power mode2 (higher layer parameter UL-fullflowertransmission-r 16 is set to fullpower mode 2), or full power mode (higher layer parameter UL-fullpower transmission-r16 is set to fullpower mode) (refer to fig. 11).

Further, when a dynamic switch between transmission to a single TRP (repeated transmission) and repeated transmission to a plurality of TRPs is indicated by each TPMI field, each TPMI field may include a code point (entry/code point not to be applied) indicating that at least one of the TPMI field and the corresponding SRI field/TRP is not to be applied.

When a dynamic switch between transmission to a single TRP (repeated transmission) and repeated transmission to a plurality of TRPs is indicated by one TPMI field, the TPMI field (for example, a TPMI field corresponding to a second TRP) may include a code point indicating which of the first SRI field (first TRP), the second SRI field (second TRP), and the first SRI field and the second SRI field is to be applied.

When the number of repetitions k=1 (single transmission) is set/indicated for the UE, the UE may determine the number of layers used/applied and precoding information based on a plurality of (e.g., 2) TPMI fields (embodiment 2-2).

For example, when the repetition number k=1 is set/indicated, the UE may determine that a code point constituted by a combination of code points of a plurality of (e.g., 2) TPMI fields corresponds to the number of layers and precoding information. In this case, the UE may determine the number of layers and precoding information to be used based on the association (e.g., table) between the number of layers and the precoding information and the plurality of TPMI fields defined up to rel.16. The UE may replace a bit field ("bit field mapped to index (Bit field mapped to index)") in the association shown in fig. 7 or the like with a bit field (code point) composed of a combination of a plurality of TPMI fields.

A code point formed by a combination of a plurality of (e.g., 2) TPMI fields may be a bit field (bit string) obtained by combining (synthesizing) the plurality of TPMI fields (bit strings).

For example, the UE may determine that (the code point of) the first TPMI field for the first TRP is the MSB (or a specific number (e.g., 2) of bits from the most significant bit) representing the code point of the combination of the plurality of TPMI fields. Further, the UE may determine that (the code point of) the second TPMI field for the second TRP is LSB (or a specific number (e.g., 2) of bits from the lowest bit) indicating the code point of the combination of the plurality of TPMI fields.

In addition, after rel.17, an association (e.g., table) including an entry having 1 or more layers as defined in rel.16 may be defined.

Fig. 12 is a diagram showing an example of a method for indicating a TPMI field according to the second embodiment. In the drawings of the present disclosure below, as an association related to TPMI, examples of the following cases are shown: the number of antenna ports is 4, the conversion precoding is invalid, the maximum rank is 2, 3 or 4 (maxrank=2, 3 or 4), and UL full power transmission (higher layer parameter UL-fullflowertransmission-r 16) is not set, or full power mode2 (higher layer parameter UL-fullflowertransmission-r 16 is set to fullflowemode 2), or full power mode (higher layer parameter UL-fullflowertransmission-r 16 is set to fullflowemode), but the application of the embodiments of the present disclosure is not limited to these examples.

In fig. 12, the number of repetitions K >1 (repeated transmission) is indicated to the UE. At this time, the UE determines the number of layers and precoding information (here, the number of layers and TPMI corresponding to index 1 (00001)) based on the code point (here, 00001) indicated in the first TPMI field (TPMI field # 1). The UE determines the number of layers and precoding information (here, the number of layers and TPMI corresponding to index 0 (00000)) based on the code point (here, 00000) indicated in the second TPMI field (TPMI field # 2). Next, the UE repeatedly transmits the information using the number of layers and the precoding information corresponding to the index 1 as the first number of layers and the precoding information, and using the number of layers and the precoding information corresponding to the index 0 as the second number of layers and the precoding information, respectively.

Fig. 13 is a diagram showing another example of the TPMI field indication method according to the second embodiment. In fig. 13, the number of repetitions k=1 (single transmission) is indicated to the UE. At this time, the UE decides the number of layers and precoding information (here, the number of layers and precoding information corresponding to the index 32 (0000100000)) based on a combination (here, 0000100000) of the code point (here, 00001) indicated by the first TPMI field (TPMI field # 1) and the code point (here, 00000) indicated by the second TPMI field (TPMI field # 2). Next, the UE performs single transmission using the layer number and precoding information corresponding to the index 32.

In the present embodiment, the bit length of each TPMI field can be set to 5 bits, compared to the case where the bit length of the conventional TPMI field is 6 bits, and therefore, overhead can be reduced. On the other hand, in the case of k=1, a plurality of TRPs (TPMI) is not required, and thus by using a combination of a plurality of (e.g., 2) TPMI fields, more entries of transmission rank (layer) larger than 1 can be indicated.

In addition, as described above, the case where different associations (tables) are used in the cases of K >1 and k=1 has been described, but a common association may be used in the cases of K >1 and k=1.

According to the above second embodiment, even when single transmission and repeated transmission are dynamically switched, the determination of TPMI in consideration of the transmission rank can be appropriately controlled.

< third embodiment >

When the number of repetitions is set by the higher layers, the DCI bit size of the SRI/TPMI field may be different depending on the setting (k=1 or K > 1) of the higher layers of the number of repetitions of PUSCH. The case where the number of repetitions is set by the higher layer may be a case where dynamic switching between single transmission (1-slot transmission) and repeated transmission (multi-slot transmission) is not supported (method 1 described above).

In the case where the number of repetitions is set by a higher layer, when the number of repetitions is set to be larger than 1, the UE may apply at least one of the instruction and association described in the first embodiment with respect to SRI corresponding to the case of K >1, and the instruction and association described in the second embodiment with respect to TPMI corresponding to the case of K > 1.

In the case where the number of repetitions is set by a higher layer, when the number of repetitions is set to 1 (when the number of repetitions is set to no repetition), the UE may apply at least one of the SRI-related instruction and association specified in rel.16 and the TPMI-related instruction and association specified in rel.16.

According to the third embodiment described above, the determination of the SRI and TPMI in consideration of the transmission rank can be appropriately controlled even when the single transmission and the repeated transmission are dynamically switched.

< fourth embodiment >

In the fourth embodiment, a description is given of UE capability (UE capability). The UE may also report (send) to the NW whether this capability is present.

The capability may also be defined according to whether repeated transmission of PUSCH for multiple TRPs is supported (M-TRP PUSCH repetition).

This capability may also be defined according to whether repeated transmission of PUSCH for multiple TRPs of type a is supported (M-TRP PUSCH repetition for repetition TYPE A).

This capability may also be defined according to whether repeated transmission of PUSCH for multiple TRPs of type B is supported (M-TRP PUSCH repetition for repetition TYPE B).

The capability may also be defined according to whether repeated transmission of PUSCH for multiple TRPs of a non-codebook is supported (M-TRP PUSCH repetition for non-codebook).

The capability may also be defined according to whether repeated transmission of PUSCH for multiple TRPs of a non-codebook is supported (M-TRP PUSCH repetition for codebook).

The capability may also be defined in terms of whether or not an association (e.g., table) for SRI indication of non-codebooks is supported when the repetition type a is indicated/set for a repetition number K > 1.

The capability may also be defined in terms of whether or not an association (e.g., table) of TPMI indications for the codebook is supported when the repetition type a is indicated/set by the repetition number K > 1.

The capability may also be defined in terms of whether or not single TRP-oriented transmissions are supported as well as dynamic switching of multiple TRP-oriented transmissions. For example, the capability may also be defined according to whether dynamic switching of the repetition number k=1 and the repetition number K >1 for PUSCH transmission is supported. Alternatively, the capability may be defined according to an indication of whether only the repetition number of PUSCH is supported (in other words, setting with higher layer signaling).

Further, the embodiments of the present disclosure may be applied to at least one of a case where the UE reports the UE capability corresponding to the at least one UE to the NW and a case where the UE is set, activated, or instructed with respect to the at least one UE capability. Embodiments of the present disclosure may also be applied to the case where a specific higher layer parameter is set/activated/indicated for a UE.

According to the fourth embodiment described above, the UE can implement the method described in the above embodiment while maintaining compatibility with the existing specifications.

(Wireless communication System)

The following describes a configuration of a wireless communication system according to an embodiment of the present disclosure. In this wireless communication system, communication is performed using one or a combination of the wireless communication methods according to the above embodiments of the present disclosure.

Fig. 14 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using long term evolution (Long Term Evolution (LTE)) standardized by the third generation partnership project (Third Generation Partnership Project (3 GPP)), the fifth generation mobile communication system new wireless (5 th generation mobile communication system New Radio (5G NR)), or the like.

The wireless communication system 1 may support dual connection (Multi-RAT dual connection (Multi-RAT Dual Connectivity (MR-DC))) between a plurality of radio access technologies (Radio Access Technology (RATs)). The MR-DC may also include a dual connection of LTE (evolved universal terrestrial radio Access (Evolved Universal Terrestrial Radio Access (E-UTRA))) with NR (E-UTRA-NR dual connection (E-UTRA-NR Dual Connectivity (EN-DC))), a dual connection of NR with LTE (NR-E-UTRA dual connection (NR-E-UTRADual Connectivity (NE-DC))), and the like.

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

The radio communication system 1 may support dual connection (NR-NR dual connection (NR-NR Dual Connectivity (NN-DC)))) as a dual connection between a plurality of base stations in the same RAT (for example, a dual connection (NR-NR dual connection) in which both MN and SN are NR base stations (gNB)).

The radio communication system 1 may include a base station 11 forming a macro cell C1 having a relatively wide coverage area, and base stations 12 (12 a to 12C) arranged in the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The arrangement, number, etc. of each cell and user terminal 20 are not limited to the illustrated embodiment. Hereinafter, the base stations 11 and 12 are collectively referred to as a base station 10 without distinction.

The user terminal 20 may also be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (Carrier Aggregation (CA)) using a plurality of component carriers (Component Carrier (CC)) and Dual Connection (DC).

Each CC may be included in at least one of the first Frequency band (Frequency Range 1 (FR 1)) and the second Frequency band (Frequency Range 2 (FR 2)). The macrocell C1 may be included in the FR1 and the small cell C2 may be included in the FR 2. For example, FR1 may be a frequency band of 6GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24GHz (above-24 GHz). The frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may be a frequency band higher than FR 2.

The user terminal 20 may communicate with each CC using at least one of time division duplex (Time Division Duplex (TDD)) and frequency division duplex (Frequency Division Duplex (FDD)).

The plurality of base stations 10 may also be connected by wire (e.g., optical fiber conforming to a common public radio interface (Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between the base stations 11 and 12 is utilized as a backhaul, the base station 11 corresponding to a higher-level station may be referred to as an integrated access backhaul (Integrated Access Backhaul (IAB)) host, and the base station 12 corresponding to a relay station (relay) may be referred to as an IAB node.

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

The user terminal 20 may be a terminal supporting at least one of communication schemes such as LTE, LTE-a, and 5G.

In the wireless communication system 1, a wireless access scheme based on orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing (OFDM)) may be used. For example, cyclic prefix OFDM (Cyclic Prefix OFDM (CP-OFDM)), discrete fourier transform spread OFDM (Discrete Fourier Transform Spread OFDM (DFT-s-OFDM)), orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access (OFDMA)), single carrier frequency division multiple access (Single Carrier Frequency Division Multiple Access (SC-FDMA)), and the like may be used in at least one of Downlink (DL)) and Uplink (UL).

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

As the downlink channel, a downlink shared channel (physical downlink shared channel (Physical Downlink Shared Channel (PDSCH))), a broadcast channel (physical broadcast channel (Physical Broadcast Channel (PBCH)))), a downlink control channel (physical downlink control channel (Physical Downlink Control Channel (PDCCH))), and the like shared by the user terminals 20 may be used in the wireless communication system 1.

As the uplink channel, an uplink shared channel (physical uplink shared channel (Physical Uplink Shared Channel (PUSCH))), an uplink control channel (physical uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (physical random access channel (Physical Random Access Channel (PRACH))), or the like shared by the user terminals 20 may be used in the wireless communication system 1.

User data, higher layer control information, system information blocks (System Information Block (SIBs)), and the like are transmitted through the PDSCH. User data, higher layer control information, etc. may also be transmitted through the PUSCH. In addition, a master information block (Master Information Block (MIB)) may also be transmitted through the PBCH.

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

The DCI scheduling PDSCH may be referred to as DL allocation, DL DCI, or the like, and the DCI scheduling PUSCH may be referred to as UL grant, UL DCI, or the like. The PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

In the detection of PDCCH, a control resource set (COntrol REsource SET (core)) and a search space (search space) may be used. CORESET corresponds to searching for the resources of DCI. The search space corresponds to a search region of PDCCH candidates (PDCCH candidates) and a search method. A CORESET may also be associated with one or more search spaces. The UE may also monitor CORESET associated with a search space based on the search space settings.

One search space may also correspond to PDCCH candidates corresponding to one or more aggregation levels (aggregation Level). The one or more search spaces may also be referred to as a set of search spaces. In addition, "search space", "search space set", "search space setting", "search space set setting", "CORESET setting", and the like of the present disclosure may also be replaced with each other.

Uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), transmission acknowledgement information (e.g., also referred to as hybrid automatic repeat request acknowledgement (Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)), ACK/NACK, etc.), and scheduling request (Scheduling Request (SR)) may also be transmitted through the PUCCH. The random access preamble used to establish a connection with a cell may also be transmitted via the PRACH.

In addition, in the present disclosure, the downlink, uplink, and the like may be expressed without adding "link". The "Physical" may be expressed without being added to the head of each channel.

In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like may be transmitted. In the wireless communication system 1, as DL-RS, a Cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), and the like may be transmitted.

The synchronization signal may be at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)), for example. The signal Block including SS (PSS, SSs) and PBCH (and DMRS for PBCH) may also be referred to as SS/PBCH Block, SS Block (SSB), or the like. Also, SS, SSB, and the like may be referred to as reference signals.

In the radio communication system 1, a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), and the like may be transmitted as an uplink reference signal (Uplink Reference Signal (UL-RS)). In addition, the DMRS may also be referred to as a user terminal specific reference signal (UE-specific Reference Signal).

(base station)

Fig. 15 is a diagram showing an example of a configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmitting/receiving unit 120, a transmitting/receiving antenna 130, and a transmission path interface (transmission line interface) 140. The control unit 110, the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140 may be provided with one or more components.

In this example, the functional blocks of the characteristic part in the present embodiment are mainly shown, and it is also conceivable that the base station 10 further has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 110 performs control of the entire base station 10. The control unit 110 can be configured by a controller, a control circuit, or the like described based on common knowledge in the technical field of the present disclosure.

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

The transmitting/receiving unit 120 may include a baseband (baseband) unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transmitting/receiving unit 120 may be configured by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmitting/receiving circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.

The transmitting/receiving unit 120 may be configured as an integral transmitting/receiving unit, or may be configured by a transmitting unit and a receiving unit. The transmission unit may be composed of the transmission processing unit 1211 and the RF unit 122. The receiving unit may be composed of a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

The transmitting/receiving antenna 130 may be constituted by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna or the like.

The transmitting/receiving unit 120 may transmit the downlink channel, the synchronization signal, the downlink reference signal, and the like. The transmitting/receiving unit 120 may receive the uplink channel, the uplink reference signal, and the like.

The transmitting/receiving unit 120 may form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

The transmission/reception section 120 (transmission processing section 1211) may perform processing of a packet data convergence protocol (Packet Data Convergence Protocol (PDCP)) layer, processing of a radio link control (Radio Link Control (RLC)) layer (for example, RLC retransmission control), processing of a medium access control (Medium Access Control (MAC)) layer (for example, HARQ retransmission control), and the like on the data, control information, and the like acquired from the control section 110, for example, to generate a bit sequence to be transmitted.

The transmission/reception section 120 (transmission processing section 1211) may perform transmission processing such as channel coding (error correction coding may be included), modulation, mapping, filter processing, discrete fourier transform (Discrete Fourier Transform (DFT)) processing (if necessary), inverse fast fourier transform (Inverse Fast Fourier Transform (IFFT)) processing, precoding, and digital-analog conversion on the bit string to be transmitted, and output a baseband signal.

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

On the other hand, the transmitting/receiving unit 120 (RF unit 122) may amplify, filter-process, demodulate a signal in a radio frequency band received by the transmitting/receiving antenna 130, and the like.

The transmitting/receiving section 120 (reception processing section 1212) may apply reception processing such as analog-to-digital conversion, fast fourier transform (Fast Fourier Transform (FFT)) processing, inverse discrete fourier transform (Inverse Discrete Fourier Transform (IDFT)) processing (if necessary), filter processing, demapping, demodulation, decoding (error correction decoding may be included), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data.

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

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

In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may be configured by at least one of the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140.

The transmitting/receiving unit 120 may transmit one piece of downlink control information (Downlink Control Information (DCI)) for 1 or more repeated transmissions of an uplink shared channel (physical uplink shared channel (Physical Uplink Shared Channel (PUSCH)) and information on the number of repetitions of the PUSCH). The control unit 110 may determine association between a sounding reference signal (Sounding Reference Signal) resource for application to transmission of the PUSCH and a value of 1 or more SRS resource identifier (SRS resource indicator, SRS Resource Indicator (SRI)) fields included in the DCI, based on the repetition number indicated by the information on the repetition number (first embodiment).

The transmitting/receiving unit 120 may transmit one piece of downlink control information (Downlink Control Information (DCI)) for 1 or more repeated transmissions of an uplink shared channel (physical uplink shared channel (Physical Uplink Shared Channel (PUSCH)) and information on the number of repetitions of the PUSCH). The control section 110 may determine association between a transmission precoding matrix indicator (Transmitted Precoding Matrix Indicator (TPMI)) and a transmission rank for application to transmission of the PUSCH and values of 1 or more TPMI fields included in the DCI, based on the repetition number indicated by the information on the repetition number (second embodiment).

(user terminal)

Fig. 16 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting/receiving unit 220, and a transmitting/receiving antenna 230. The control unit 210, the transmitting/receiving unit 220, and the transmitting/receiving antenna 230 may be provided with one or more types.

In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 210 performs control of the entire user terminal 20. The control unit 210 can be configured by a controller, a control circuit, or the like described based on common knowledge in the technical field of the present disclosure.

The control unit 210 may also control the generation, mapping, etc. of signals. The control unit 210 may control transmission/reception, measurement, and the like using the transmission/reception unit 220 and the transmission/reception antenna 230. The control unit 210 may generate data, control information, a sequence, and the like transmitted as signals, and forward the same to the transmitting/receiving unit 220.

The transceiver unit 220 may also 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 transmitter/receiver unit 220 may be configured by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmission/reception circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.

The transmitting/receiving unit 220 may be configured as an integral transmitting/receiving unit, or may be configured by a transmitting unit and a receiving unit. The transmission means may be constituted by the transmission processing means 2211 and the RF means 222. The receiving unit may be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

The transmitting/receiving antenna 230 may be constituted by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna or the like.

The transceiver unit 220 may also receive the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transceiver unit 220 may transmit the uplink channel, the uplink reference signal, and the like.

The transmitting/receiving unit 220 may form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

The transmission/reception section 220 (transmission processing section 2211) may perform, for example, PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control) and the like on the data, control information and the like acquired from the control section 210, to generate a bit sequence to be transmitted.

The transmission/reception section 220 (transmission processing section 2211) may perform transmission processing such as channel coding (error correction coding may be included), modulation, mapping, filter processing, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, and the like on the bit string to be transmitted, and output a baseband signal.

Further, whether to apply DFT processing may be based on the setting of transform precoding. When transform precoding is effective (enabled) for a certain channel (e.g., PUSCH), transmission/reception section 220 (transmission processing section 2211) may perform DFT processing as the transmission processing for transmitting the channel using a DFT-s-OFDM waveform, and when the transmission processing is not the case, may not perform DFT processing as the transmission processing.

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

On the other hand, the transmitting/receiving unit 220 (RF unit 222) may amplify, filter-process, demodulate a signal in a radio frequency band received by the transmitting/receiving antenna 230, and the like.

The transmitting/receiving section 220 (reception processing section 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, decoding (error correction decoding may be included), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data.

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

In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230.

The transmission/reception unit 220 may receive one piece of downlink control information (Downlink Control Information (DCI)) for 1 or more repeated transmissions of an uplink shared channel (physical uplink shared channel (Physical Uplink Shared Channel (PUSCH)) and information on the number of repetitions of the PUSCH). The control section 210 may determine the association between the sounding reference signal (Sounding Reference Signal) resource for application to the PUSCH transmission and the value of 1 or more SRS resource identifier (SRS resource indicator, SRS Resource Indicator (SRI)) fields included in the DCI, based on the repetition number indicated by the information on the repetition number (first embodiment).

If the number of repetitions is greater than 1, only an entry having one SRS resource may be included in the association (first embodiment).

In the case where the number of repetitions is greater than 1, an entry for indicating that SRI is not applied may be included in the association (first embodiment).

When the repetition number is 1, control section 210 may determine SRS resources to be applied to transmission of the PUSCH based on a bit string obtained by combining (synthesizing) a plurality of SRI fields included in the DCI (first embodiment).

The transmission/reception unit 220 may receive one piece of downlink control information (Downlink Control Information (DCI)) for 1 or more repeated transmissions of an uplink shared channel (physical uplink shared channel (Physical Uplink Shared Channel (PUSCH)) and information on the number of repetitions of the PUSCH). The control section 210 may determine association between a transmission precoding matrix indicator (Transmitted Precoding Matrix Indicator (TPMI)) and a transmission rank for application to transmission of the PUSCH and values of 1 or more TPMI fields included in the DCI, based on the repetition number indicated by the information on the repetition number (second embodiment).

If the number of repetitions is greater than 1, only an entry having a transmission rank value of 1 may be included in the association (second embodiment).

If the number of repetitions is greater than 1, an entry for indicating that TPMI is not applied may be included in the association (second embodiment).

When the repetition number is 1, control section 210 may determine a TPMI and a transmission rank to be applied to transmission of the PUSCH based on a bit string obtained by combining (synthesizing) a plurality of TPMI fields included in the DCI (second embodiment).

(hardware construction)

The block diagrams used in the description of the above embodiments represent blocks of functional units. These functional blocks (structural units) are realized by any combination of at least one of hardware and software. The implementation method of each functional block is not particularly limited. That is, each functional block may be realized by using one device physically or logically combined, or may be realized by directly or indirectly (for example, by using a wire, a wireless, or the like) connecting two or more devices physically or logically separated from each other, and using these plurality of devices. The functional blocks may also be implemented in software as a combination of one or more of the above-described devices.

Here, the functions include, but are not limited to, judgment, decision, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, expectation, view, broadcast (broadcasting), notification (notification), communication (communication), forwarding (forwarding), configuration (setting), reconfiguration (resetting), allocation (allocating, mapping (mapping)), assignment (assignment), and the like. For example, a functional block (structural unit) that performs a transmission function may be referred to as a transmission unit (transmitting unit), a transmitter (transmitter), or the like. As described above, the implementation method is not particularly limited.

For example, a base station, a user terminal, and the like in one embodiment of the present disclosure may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig. 17 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The base station 10 and the user terminal 20 described above 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, and the like.

In addition, in the present disclosure, languages of apparatuses, circuits, devices, units (units), and the like can be replaced with each other. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the illustrated devices, or may be configured to not include a part of the devices.

For example, the processor 1001 is illustrated as only one, but there may be multiple processors. In addition, the processing may be performed by 1 processor, or the processing may be performed by 2 or more processors simultaneously, sequentially, or using other methods. The processor 1001 may be realized by 1 or more chips.

Each function in the base station 10 and the user terminal 20 is realized by, for example, causing a specific software (program) to be read in hardware such as a processor 1001 and a memory 1002, and the processor 1001 performs an operation to control communication via the communication device 1004, or to control at least one of reading and writing of data in the memory 1002 and the memory 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, at least a part of the control unit 110 (210), the transmitting/receiving unit 120 (220), and the like described above may be implemented by the processor 1001.

The processor 1001 reads out a program (program code), a software module, data, or the like from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and executes various processes according to them. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments is used. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same may be implemented for other functional blocks.

The Memory 1002 is a computer-readable recording medium, and may be constituted by at least one of a Read Only Memory (ROM), an erasable programmable ROM (Erasable Programmable ROM (EPROM)), an electrically EPROM (Electrically EPROM (EEPROM)), a random access Memory (Random Access Memory (RAM)), and other suitable storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage), or the like. The memory 1002 can store programs (program codes), software modules, and the like executable to implement a wireless communication method according to an embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, and may be constituted of at least one of, for example, a flexible disk, a soft (registered trademark) disk, an optical magnetic disk (e.g., a Compact disk ROM (CD-ROM)), a digital versatile disk, a Blu-ray (registered trademark) disk, a removable disk, a hard disk drive, a smart card (smart card), a flash memory device (e.g., card, stick, key drive)), a magnetic stripe (strip), a database, a server, and other appropriate storage media. The storage 1003 may also be referred to as secondary storage.

The communication device 1004 is hardware (transmission/reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like, for example. The communication device 1004 may include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, or the like in order to realize at least one of frequency division duplexing (Frequency Division Duplex (FDD)) and time division duplexing (Time Division Duplex (TDD)). For example, the transmitting/receiving unit 120 (220), the transmitting/receiving antenna 130 (230), and the like described above may be implemented by the communication device 1004. The transmitting and receiving units 120 (220) may also implement physical or logical separation of the transmitting unit 120a (220 a) and the receiving unit 120b (220 b).

The input device 1005 is an input apparatus (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, or the like) that receives an input from the outside. The output device 1006 is an output apparatus (for example, a display, a speaker, a light emitting diode (Light Emitting Diode (LED)) lamp, or the like) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

The processor 1001, the memory 1002, and other devices are connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using a different bus between each device.

The base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (Digital Signal Processor (DSP)), an application specific integrated circuit (Application Specific Integrated Circuit (ASIC)), a programmable logic device (Programmable Logic Device (PLD)), and a field programmable gate array (Field Programmable Gate Array (FPGA)), or may use the hardware to realize a part or all of the functional blocks. For example, the processor 1001 may also be implemented using at least one of these hardware.

(modification)

In addition, terms described in the present disclosure and terms necessary for understanding of the present disclosure may be replaced with terms having the same or similar meanings. For example, channels, symbols, and signals (signals or signaling) may also be interchanged. In addition, the signal may also be a message. The Reference Signal (RS) can also be simply referred to as RS, or Pilot (Pilot), pilot Signal, or the like, depending on the standard applied. In addition, the component carrier (Component Carrier (CC)) may also be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

A radio frame may also be formed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, a subframe may be formed of one or more slots in the time domain. The subframes may also be a fixed length of time (e.g., 1 ms) independent of the parameter set (numerology).

Here, the parameter set (numerology) may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The parameter set (numerology) may also represent at least one of a subcarrier spacing (SubCarrier Spacing (SCS)), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (Transmission Time Interval (TTI)), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in a frequency domain, a specific windowing (windowing) process performed by a transceiver in a time domain, and the like, for example.

A slot may also be formed in the time domain by one or more symbols, orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing (OFDM)) symbols, single carrier frequency division multiple access (Single Carrier Frequency Division Multiple Access (SC-FDMA)) symbols, etc. Furthermore, the time slots may also be time units based on parameter sets.

The time slot may also contain a plurality of mini-slots. Each mini-slot may also be formed of one or more symbols in the time domain. In addition, the mini-slot may also be referred to as a sub-slot. Mini-slots may also be made up of a fewer number of symbols than slots. PDSCH (or PUSCH) transmitted in a larger time unit than the mini-slot may also be referred to as PDSCH (PUSCH) mapping type a. PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.

The radio frame, subframe, slot, mini-slot, and symbol all represent units of time when a signal is transmitted. Radio frames, subframes, slots, mini-slots, and symbols may also use other designations corresponding to each. In addition, the frame, subframe, slot, mini-slot, symbol, and the like units in the present disclosure may also be replaced with each other.

For example, 1 subframe may also be referred to as a TTI, a plurality of consecutive subframes may also be referred to as a TTI, and 1 slot or 1 mini-slot may also be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the conventional LTE, a period (for example, 1 to 13 symbols) shorter than 1ms, or a period longer than 1 ms. In addition, a unit representing a TTI may also be referred to as a slot, a mini-slot, etc., and is not referred to as a subframe.

Here, TTI refers to, for example, a scheduled minimum time unit in wireless communication. For example, in the LTE system, a base station performs scheduling for each user terminal to allocate radio resources (bandwidth, transmission power, and the like that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a data packet (transport block), a code block, a codeword, or the like after channel coding, or may be a processing unit such as scheduling or link adaptation. In addition, when a TTI is given, a time interval (for example, the number of symbols) in which a transport block, a code block, a codeword, or the like is actually mapped may be shorter than the TTI.

In addition, when 1 slot or 1 mini slot is called TTI,1 or more TTI (i.e., 1 or more slot or 1 or more mini slot) may be the minimum time unit for scheduling. In addition, the number of slots (the number of mini slots) constituting the minimum time unit of the schedule can also be controlled.

A TTI having a time length of 1ms may also be referred to as a normal TTI (TTI in 3gpp rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a slot, etc. A TTI that is shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

In addition, a long TTI (e.g., normal TTI, subframe, etc.) may be replaced with a TTI having a time length exceeding 1ms, and a short TTI (e.g., shortened TTI, etc.) may be replaced with a TTI having a TTI length less than the long TTI and a TTI length of 1ms or more.

A Resource Block (RB) is a Resource allocation unit of the time domain and the frequency domain, and may include one or a plurality of consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in the RB may be the same regardless of the parameter set (numerology), and may be 12, for example. The number of subcarriers included in the RB may also be decided based on a parameter set (numerology).

Further, in the time domain, an RB may also contain one or more symbols, and may also be 1 slot, 1 mini slot, 1 subframe, or 1 TTI in length. 1 TTI, 1 subframe, etc. may also be each composed of one or more resource blocks.

In addition, one or more RBs may also be referred to as Physical Resource Blocks (PRBs), subcarrier groups (SCGs), resource element groups (Resource Element Group (REGs)), PRB pairs, RB peering.

Furthermore, a Resource block may also be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

A Bandwidth Part (BWP) (which may also be referred to as a partial Bandwidth or the like) may also represent a subset of consecutive common RBs (common resource blocks (common resource blocks)) for a certain parameter set (numerology) in a certain carrier. Here, the common RB may also be determined by an index of RBs with respect to a common reference point of the carrier. PRBs may be defined in a BWP and a sequence number may be added to the BWP.

The BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL). For a UE, one or more BWP may be set within 1 carrier.

At least one of the set BWP may be active, and the UE may not contemplate transmitting and receiving a specific signal/channel outside the active BWP. In addition, "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

The above-described configurations of radio frames, subframes, slots, mini-slots, symbols, and the like 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 mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and the like can be variously changed.

The information, parameters, and the like described in this disclosure may be expressed using absolute values, relative values to a specific value, or other corresponding information. For example, radio resources may also be indicated by a specific index.

The names used for parameters and the like in this disclosure are not limiting names at any point. Furthermore, the expressions and the like using these parameters may also be different from those explicitly disclosed in the present disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and thus the various names assigned to these various channels and information elements are not limiting names at any point.

Information, signals, etc. described in this disclosure may also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips (chips), and the like may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

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

The information, signals, and the like to be input and output may be stored in a specific place (for example, a memory), or may be managed using a management table. Information, signals, etc. inputted and outputted can be overwritten, updated, or recorded. The outputted information, signals, etc. may also be deleted. The input information, signals, etc. may also be transmitted to other devices.

The notification of information is not limited to the manner/embodiment described in the present disclosure, and may be performed using other methods. For example, notification of information in the present disclosure may also be implemented by physical layer signaling (e.g., downlink control information (downlink control information: downlink Control Information (DCI)), uplink control information (uplink control information: uplink Control Information (UCI)), higher layer signaling (e.g., radio resource control (Radio Resource Control (RRC)) signaling, broadcast information (master information block (Master Information Block (MIB)), system information block (System Information Block (SIB)), etc.), medium access control (Medium Access Control (MAC)) signaling), other signals, or a combination thereof.

The physical Layer signaling may be referred to as Layer1/Layer2 (L1/L2)) control information (L1/L2 control signal), L1 control information (L1 control signal), or the like. The RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration)) message, or the like. The MAC signaling may be notified using, for example, a MAC control element (MAC Control Element (CE)).

Note that the notification of specific information (for example, notification of "X") is not limited to explicit notification, and may be performed implicitly (for example, by not notifying the specific information or notifying other information).

The determination may be performed by a value (0 or 1) expressed in 1 bit, a true or false value (boolean) expressed in true or false, or a comparison of values (for example, a comparison with a specific value).

Whether software is referred to as software, firmware, middleware, microcode, hardware description language, or by other names, it should be construed broadly to mean instructions, instruction sets, code segments, program code, programs, subroutines, software modules, applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, and the like.

In addition, software, instructions, information, etc. may also be transmitted and received via a transmission medium. For example, where software is transmitted from a website, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (Digital Subscriber Line (DSL)), etc.), and wireless technology (infrared, microwave, etc.), the at least one wired technology and wireless technology are included in the definition of transmission medium.

The term "system" and "network" as used in this disclosure can be used interchangeably. "network" may also mean a device (e.g., a base station) contained in a network.

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

In the present disclosure, terms such as "Base Station (BS)", "radio Base Station", "fixed Station", "NodeB", "eNB (eNodeB)", "gNB (gndb)", "access Point"), "Transmission Point (Transmission Point (TP))", "Reception Point (RP))", "Transmission Reception Point (Transmission/Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", and the like can be used interchangeably. Base stations are also sometimes referred to by the terms macrocell, microcell, femtocell, picocell, and the like.

The base station can accommodate one or more (e.g., three) cells. In the case of a base station accommodating multiple cells, the coverage area of the base station can be divided into multiple smaller areas, each of which can also be served by a base station subsystem (e.g., a small base station for indoor use (remote radio head (Remote Radio Head (RRH)))). The term "cell" or "sector" refers to a portion or the entirety of the coverage area of at least one of the base station and the base station subsystem in which communication services are conducted in that coverage area.

In the present disclosure, terms of "Mobile Station (MS)", "User terminal", "User Equipment (UE)", "terminal", and the like can be used interchangeably.

A mobile station is also sometimes referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, or some other appropriate terminology.

At least one of the base station and the mobile station may be referred to as a transmitting apparatus, a receiving apparatus, a wireless communication apparatus, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), a mobile body that moves unmanned (e.g., an unmanned plane, an automated guided vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move at the time of communication operation. For example, at least one of the base station and the mobile station may be an internet of things (Internet of Things (IoT)) device such as a sensor.

In addition, the base station in the present disclosure may be replaced with a user terminal. For example, the 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 a plurality of user terminals (for example, may also be referred to as Device-to-Device (D2D)), vehicle-to-evaluation (V2X), or the like. In this case, the user terminal 20 may have the functions of the base station 10 described above. The language "uplink", "downlink", and the like may be replaced with a language (e.g., "side") corresponding to the communication between terminals. For example, the uplink channel, the downlink channel, etc. may be replaced with a side channel.

Also, the user terminal in the present disclosure may be replaced with a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

In the present disclosure, the operation to be performed by the base station is sometimes performed by an upper node (upper node) thereof, as the case may be. In a network including one or more network nodes (network nodes) having a base station, it is apparent that various operations performed for communication with a terminal can be performed through the base station, one or more network nodes other than the base station (for example, consider (mobility management entity (Mobility Management Entity (MME)), serving-Gateway (S-GW)), or the like, but not limited thereto, or a combination thereof.

The embodiments described in the present disclosure may be used alone, in combination, or switched with execution. The processing procedures, timings, flowcharts, and the like of the embodiments and/or the embodiments described in the present disclosure may be changed in order as long as there is no contradiction. For example, elements of various steps are presented using an illustrated order for the methods described in this disclosure, and are not limited to the particular order presented.

The various modes/embodiments described in the present disclosure can also be applied to long term evolution (Long Term Evolution (LTE)), LTE-Advanced (LTE-a), LTE-Beyond (LTE-B), upper 3G, IMT-Advanced, fourth generation mobile communication system (4 th generation mobile communication system (4G)), fifth generation mobile communication system (5 th generation mobile communication system (5G)), sixth generation mobile communication system (6 th generation mobile communication system (6G)), x-th generation mobile communication system (xth generation mobile communication system (xG) (xG (x is, for example, an integer, a fraction)), future wireless access (Future Radio Access (FRA)), new-Radio Access Technology (RAT)), new wireless (New Radio (NR)), new wireless access (NX)), next generation wireless access (Future generation Radio access (FX)), global mobile communication system (Global System for Mobile communications (GSM (registered trademark)), 2000, ultra mobile broadband (Ultra Mobile Broadband (UMB)), IEEE 802.11 (IEEE-Fi (registered trademark) 802.16 (Wi), ultra-WideBand (registered trademark), wireless communication systems (Ultra-WideBand), and the like, and suitable extended methods based on them, multiple system combinations (e.g., LTE or a combination of LTE-a and 5G, etc.) may also be applied.

The description of "based on" as used in the present disclosure does not mean "based only on" unless explicitly stated otherwise. In other words, the expression "based on" means both "based on" and "based on" at least.

Any reference to elements using references to "first," "second," etc. in this disclosure is not intended to fully define the amount or order of those elements. These designations can be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to a first and second element does not mean that only two elements can be employed or that in some form the first element must precede the second element.

The term "determining" as used in the present disclosure sometimes encompasses a wide variety of operations. For example, "determination" may be regarded as a case where "determination" is performed on determination (computing), calculation (calculating), processing (processing), derivation (deriving), investigation (searching), search (searching), query (query) (for example, search in a table, database, or other data structure), confirmation (identifying), or the like.

Further, "determination (decision)" may be regarded as a case where "determination (decision)" is made on reception (e.g., receiving information), transmission (e.g., transmitting information), input (input), output (output), access (access) (e.g., accessing data in a memory), or the like.

Further, "judgment (decision)" may be regarded as "judgment (decision)" of resolution (resolution), selection (selection), selection (setting), establishment (establishment), comparison (comparison), and the like. That is, "judgment (decision)" may also be regarded as "judgment (decision)" for some operations.

The "judgment (decision)" may be replaced with "assumption", "expected", "regarded as" and the like.

The term "connected", "coupled", or all variants thereof as used in this disclosure means all direct or indirect connection or coupling between 2 or more elements, and can include the case where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection of the elements may be physical, logical, or a combination thereof. For example, "connected" may also be replaced by "connected".

In the present disclosure, in the case of connecting two elements, it can be considered that one or more wires, cables, printed electric connections, or the like are used, and electromagnetic energy having wavelengths in a wireless frequency domain, a microwave domain, an optical (visible light and invisible light) domain, or the like, which are some non-limiting and non-inclusive examples, are used, and the two elements are "connected" or "combined" with each other.

In the present disclosure, the term "a is different from B" may also mean that "a is different from B". In addition, the term may also mean that "A and B are each different from C". Terms such as "separate," coupled, "and the like may also be construed as" different.

In the case where "include", and variations thereof are used in the present disclosure, these terms are meant to be inclusive as well as the term "comprising". Further, the term "or" as used in this disclosure means not exclusive or.

In the present disclosure, for example, in the case where an article is added by translation as in a, an, and the in english, the present disclosure may also include that a noun subsequent to the article is in plural.

While the invention according to the present disclosure has been described in detail, it will be apparent 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 as a modification and variation without departing from the spirit and scope of the invention determined based on the description of the claims. Accordingly, the description of the present disclosure is intended to be illustrative, and is not intended to be limiting of the invention in any way.

Claims (6)

1. A terminal, comprising:

a reception unit configured to receive DCI which is one piece of downlink control information for repeated transmission of 1 or more PUSCHs which are uplink shared channels, and information on the number of repetitions of the PUSCHs; and

a control unit configured to determine, based on the number of repetitions indicated by the information on the number of repetitions, an association between a transmission precoding matrix indicator TPMI and a transmission rank for application to transmission of the PUSCH, and values of 1 or more TPMI fields included in the DCI.

2. The terminal of claim 1, wherein,

if the number of repetitions is greater than 1, only an entry having a value of 1 of the transmission rank is included in the association.

3. The terminal of claim 1, wherein,

in the case where the number of repetitions is greater than 1, an entry for indicating that the TPMI is not applied is included in the association.

4. The terminal of claim 1, wherein,

when the repetition number is 1, the control unit determines TPMI and transmission rank to be applied to transmission of the PUSCH based on a bit string obtained by combining a plurality of TPMI fields included in the DCI.

5. A wireless communication method for a terminal includes:

a step of receiving DCI which is one piece of downlink control information for repeated transmission of 1 or more PUSCHs which are uplink shared channels, and information on the number of repetitions of the PUSCHs; and

and determining association between a transmission precoding matrix indicator TPMI and a transmission rank for application to transmission of the PUSCH and values of 1 or more TPMI fields included in the DCI, based on the number of repetitions indicated by the information on the number of repetitions.

6. A base station, comprising:

a transmission unit configured to transmit DCI which is one piece of downlink control information for repeated transmission of 1 or more PUSCHs which are uplink shared channels, and information on the number of repetitions of the PUSCHs; and

A control unit configured to determine, based on the number of repetitions indicated by the information on the number of repetitions, an association between a transmission precoding matrix indicator TPMI and a transmission rank for application to transmission of the PUSCH, and values of 1 or more TPMI fields included in the DCI.