Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure includes a reception unit that receives a downlink shared channel scheduled by downlink control information, and a control unit that determines a spatial relation or a TCI state applied to an uplink channel corresponding to the downlink control information based on at least one of a TCI state (Transmission Configuration Indication state) applied to the downlink shared channel and information notified by the downlink control information.

Description

TECHNICAL FIELD

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

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further high-speed data rates, low latency, and so on (Non-Patent Literature 1). Further, LTE-Advanced (3GPP Rel. 10-14) has been standardized for the purpose of further large capacity, higher, and so on of LTE (3rd Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] A subsequent system of LTE (for example, 5th generation mobile communication system (5G), 5G (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 onwards, and so on) is also being studied.

[0004] In the existing LTE system (for example, 3GPP Rel. 8-14), a user terminal (User Equipment (UE)) transmits uplink control information (UCI) using at least one of an UL data channel (for example, a Physical Uplink Shared Channel (PUSCH)) and an UL control channel (for example, a Physical Uplink Control Channel (PUCCH)).

[0005] PRIOR ART DOCUMENTS

[0006] NON-PATENT LITERATURE

[0007] Non-Patent Literature 1: 3GPP TS 36.300 V8.12.0 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)", April 2010 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] In a future wireless communication system (for example, NR), it is envisaged that a UL beam utilized in UL transmission of a UE is dynamically switched to be applied. For example, consider a case where a network (for example, a base station) dynamically (for example, at a DCI level) instructs a UE of information related to a UL beam utilized in transmission of an uplink channel (for example, PUCCH / PUSCH) corresponding to downlink control information (Downlink Control Information (DCI)). The information related to the UL beam can also be spatial relation information or a TCI state (Transmission Configuration Indication state).

[0010] However, there is no sufficient research on how information related to a UL beam utilized in transmission of a UL channel is dynamically notified to a UE. In a case where notification of a UL beam or a switching operation of a UL beam is not properly performed, there is a concern that communication quality is degraded.

[0011] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that suppress degradation of communication quality even in a case where beams are switched to communicate.

[0012] MEANS FOR SOLVING THE PROBLEMS

[0013] A terminal according to one embodiment of the present disclosure is characterized by including a reception unit that receives a downlink shared channel scheduled by downlink control information, and a control unit that decides a spatial relation or a TCI state applied to an uplink channel corresponding to the downlink control information, on the basis of at least one of a TCI state (Transmission Configuration Indication state) applied to the downlink shared channel and information notified by the downlink control information.

[0014] Inventive Effects

[0015] According to one embodiment of the present disclosure, even when beams are switched to communicate, degradation of communication quality can be suppressed. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a diagram that explains a subject of the method of determining the spatial relation / TCI state of the UL channel.

[0017] Figure 2 is a diagram that shows one example of the method of determining the spatial relation / TCI state of the UL channel.

[0018] Figure 3 is a diagram that shows another example of the method of determining the spatial relation / TCI state of the UL channel.

[0019] Figure 4 is a diagram that shows another example of the method of determining the spatial relation / TCI state of the UL channel.

[0020] Figure 5 is a diagram that explains a subject of the method of determining the spatial relation / TCI state of the UL channel in the case where cross-carrier scheduling is applied.

[0021] Figure 6 is a diagram that shows one example of the method of determining the spatial relation / TCI state of the UL channel in the case where cross-carrier scheduling is applied.

[0022] Figure 7 is a diagram that shows another example of the method of determining the spatial relation / TCI state of the UL channel in the case where cross-carrier scheduling is applied.

[0023] Figure 8 is a diagram that shows another example of the method of determining the spatial relation / TCI state of the UL channel in the case where cross-carrier scheduling is applied.

[0024] Figure 9 is a diagram that shows another example of the method of determining the spatial relation / TCI state of the UL channel in the case where cross-carrier scheduling is applied.

[0025] Figure 10 is a diagram that shows another example of the method of determining the spatial relation / TCI state of the UL channel in the case where cross-carrier scheduling is applied.

[0026] Figure 11 is a diagram that shows another example of the method of determining the spatial relation / TCI state of the UL channel in the case where cross-carrier scheduling is applied.

[0027] Figure 12 is a diagram that shows one example of the outline structure of a wireless communication system according to an embodiment.

[0028] Figure 13 FIG. 1 is a diagram illustrating an example of a structure of a base station according to an embodiment.

[0029] Figure 14 FIG. 2 is a diagram illustrating an example of a structure of a user terminal according to an embodiment.

[0030] Figure 15 FIG. 3 is a diagram illustrating an example of a hardware structure of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION

[0031] (TCI, spatial relation, QCL)

[0032] In NR, it is being studied to control at least one of reception processing (for example, at least one of reception, demapping, demodulation, and decoding) and transmission processing (for example, at least one of transmission, mapping, precoding, modulation, and coding) of a signal and a channel (hereinafter, also referred to as a signal / channel) in a UE based on a transmission configuration indication state (TCI state).

[0033] A TCI state can also indicate an element applied to a signal / channel of a downlink. An element equivalent to a TCI state applied to a signal / channel of an uplink can also be expressed as a spatial relation.

[0034] A TCI state is information related to quasi-co-location (QCL) of a signal / channel, and can also be referred to as a spatial reception parameter, spatial relation information, or the like. A TCI state can also be set to a UE per channel or per signal. A TCI state, QCL, and QCL assumption can also be replaced with each other.

[0035] In addition, in the present disclosure, a TCI state of a DL can also be replaced with a spatial relation of a UL, a TCI state of a UL, and the like.

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

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

[0038] With respect to QCL, a plurality of types (QCL types) can also be specified. For example, four QCL types A-D can also be set, in which different parameters (or parameter sets) can be assumed to be the same, and with respect to the parameters (which can also be referred to as QCL parameters), the following is indicated:

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

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

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

[0042] • QCL Type D (QCL-D): Spatial reception parameter.

[0043] The case in which the UE assumes that a certain control resource set (Control Resource Set (CORESET)), channel, or reference signal is in a certain QCL (e.g., QCL Type D) relationship with other CORESETs, channels, or reference signals can also be referred to as QCL assumption.

[0044] The UE can also determine at least one of the transmission beam (Tx beam) and the reception beam (Rx beam) of the signal / channel based on the TCI state or QCL assumption of the signal / channel.

[0045] The TCI state may, for example, also be information related to QCL between a channel (in other words, a reference signal (RS) for the channel) that becomes a target and other signals (for example, other RSs). The TCI state may also be configured (indicated) by higher layer signaling, physical layer signaling, or a combination thereof.

[0046] In the present disclosure, the higher layer signaling may, for example, also be any one of radio resource control (RRC) signaling, medium access control (MAC) signaling, broadcast information, or the like, or a combination thereof.

[0047] The MAC signaling may, for example, also use a MAC control element (MAC CE), a MAC protocol data unit (PDU), or the like. The broadcast information may, for example, also be a master information block (MIB), a system information block (SIB), remaining minimum system information (RMSI), other system information (OSI), or the like.

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

[0049] The channel for which the TCI state or spatial relation is configured (indicated) may, for example, also be at least one of a downlink shared channel (physical downlink shared channel (PDSCH)), a downlink control channel (physical downlink control channel (PDCCH)), an uplink shared channel (physical uplink shared channel (PUSCH)), and an uplink control channel (physical uplink control channel (PUCCH)).

[0050] Further, the RS in the QCL relationship with the channel can also be at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a reference signal for measurement (sounding reference signal (SRS)), a CSI-RS for tracking (also referred to as a tracking reference signal (TRS)), and a reference signal for QCL detection (also referred to as a QRS), for example.

[0051] The SSB is a signal block including at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a broadcast channel (physical broadcast channel (PBCH)). The SSB can also be referred to as an SS / PBCH block.

[0052] The information element of the TCI state set by higher layer signaling (RRC "TCI-state IE") can also include one or more QCL information ("QCL-Info"). The QCL information can also include at least one of information related to the RS in the QCL relationship (RS relationship information) and information indicating the QCL type (QCL type information). The RS relationship information can also include information of the index of the RS (for example, an SSB index, a non-zero power CSI-RS (NZP CSI-RS) resource ID (identifier)), the index of the cell where the RS is located, the index of the bandwidth part (BWP) where the RS is located, and the like.

[0053] In Rel. 15 NR, as the TCI state of at least one of the PDCCH and the PDSCH, both the RS of QCL Type A and the RS of QCL Type D or only the RS of QCL Type A can be set to the UE.

[0054] In the case where the TRS is set as the RS of QCL Type A, the TRS is assumed to be periodically transmitted for a long time with the same TRS unlike the DeModulation Reference Signal (DMRS) of the PDCCH or the PDSCH. The UE can measure the TRS and calculate the average delay, the delay spread, and the like.

[0055] In a UE in which a TCI state of a DMRS of a PDCCH or a PDSCH is set with the TRS as a QCL Type A RS, it is conceivable that the QCL Type A parameters (average delay, delay spread, etc.) of the DMRS of the PDCCH or the PDSCH are the same as those of the TRS, and thus the QCL Type A parameters (average delay, delay spread, etc.) of the DMRS of the PDCCH or the PDSCH can be derived from the measurement result of the TRS. The UE can perform more accurate channel estimation using the measurement result of the TRS when performing channel estimation of at least one of the PDCCH and the PDSCH.

[0056] A UE in which a RS of QCL Type D is set can determine a UE receive beam (spatial domain receive filter, UE spatial domain receive filter) using the RS of QCL Type D.

[0057] A RS of QCL Type X of a TCI state can also mean a RS in a QCL Type X relationship with a certain channel / signal (DMRS), and the RS can also be referred to as a QCL source of QCL Type X of the TCI state.

[0058] (PDSCH TCI state)

[0059] Information related to QCL between a PDSCH (or a DMRS antenna port associated with the PDSCH) and a certain DL-RS can also be referred to as a TCI state for the PDSCH, etc.

[0060] A UE can also be notified (set) of M (M ≥ 1) TCI states (M PDSCH QCL information) for a PDSCH by higher layer signaling. In addition, the number M of TCI states set to the UE can also be limited by at least one of a UE capability and a QCL type.

[0061] A DCI used in scheduling of a PDSCH can also include a field indicating a TCI state for the PDSCH (for example, can also be referred to as a TCI field, a TCI state field, etc.). The DCI can also be used in scheduling of a PDSCH of one cell, and can also be referred to as a DL DCI, a DL assignment, a DCI format 1_0, a DCI format 1_1, etc.

[0062] Whether or not the TCI field is included in the DCI can also be controlled by information notified to the UE from the base station. This information can also be information indicating whether or not the TCI field is present or absent within the DCI (for example, TCI presence information, TCI present in DCI information, higher layer parameter TCI-PresentInDCI). This information can also be set to the UE, for example, by higher layer signaling.

[0063] In a case where more than eight kinds of TCI states are set to the UE, a MAC CE can also be used to activate (or specify) TCI states of eight kinds or less. This MAC CE can also be referred to as a TCI states activation / deactivation MAC CE for UE-specific PDSCH (TCI States Activation / Deactivation for UE-specific PDSCH MAC CE). The value of the TCI field within the DCI can also indicate one of the TCI states activated by the MAC CE.

[0064] Furthermore, in relation to the application of the TCI state to the PDSCH, multiple scenarios such as the following are being studied.

[0065] <Scenario 0>

[0066] In a case where tci-PresentInDCI is made valid by RRC, a 3-bit DCI field (TCI field) is present within a certain DCI format (DL assignment), and this DCI field can also indicate any (one) of the maximum eight activated TCI states of the PDSCH. The certain DCI format can also be DCI format 1_1, for example.

[0067] <Scenario 1>

[0068] In a case where tci-PresentInDCI is not made valid (enabled) by RRC, a 3-bit DCI field (TCI field) is not present within DCI format 1_1 (DL assignment), and this DCI field cannot indicate any (one) of the maximum eight activated TCI states of the PDSCH. In this case, the UE applies a default TCI state to the PDSCH.

[0069] For example, in a case where tci-PresentInDCI is not valid (PDSCH is scheduled by a DCI format in which a TCI state is not present), and the scheduling offset is equal to or more than a threshold (timeDurationForQCL), the UE can also assume that the default TCI state is the TCI state of the CORESET (used CORESET) that schedules the PDSCH (is the same as the TCI state), and can also apply the TCI state to the PDSCH.

[0070] In the present disclosure, the scheduling offset is the period (time offset) between the reception of the DL DCI (PDCCH) and the reception of the corresponding PDSCH. The threshold (timeDurationForQCL) compared with the scheduling offset can also be based on the UE capability (capability) reported for deciding the PDSCH antenna port QCL.

[0071] <Case 2>

[0072] In a case where the scheduling offset is less than the threshold regardless of whether tci-PresentInDCI is valid or not, the UE does not apply (cannot apply) the TCI state specified by the DCI to the reception of the corresponding PDSCH. That is, the UE does not perform (cannot perform) the switching of the TCI state of the PDSCH based on the DCI. In this case, the UE applies the default TCI state. The default TCI state can also be the TCI state corresponding to the lowest CORESET ID in the latest monitoring slot.

[0073] For example, in a case where all TCI codepoints are mapped to a single TCI state regardless of the structure of tci-PresentInDCI and tci-PresentInDCI-ForFormat1_2 in the RRC connected mode, and the scheduling offset is less than the threshold, the UE assumes that the RS related to the QCL parameter used in the QCL indication of the PDCCH of the specific CORESET is QCL with the DM-RS port of the PDSCH of the serving cell. The specific CORESET is associated with the monitored search space having the lowest controlResourceSetId in the latest slot among one or more CORESETs monitored by the UE within the activated BWP of the serving cell. In addition, in the present disclosure, the condition of "in the latest slot" (in the latest monitoring slot) can also be omitted.

[0074] <Case 3>

[0075] In a case where cross-carrier scheduling is used, the UE applies a default TCI state different from that in a case where non-cross-carrier scheduling is used (e.g., Case 1 and Case 2). In a case where the PDCCH and the PDSCH exist in the same CC, the UE can also not expect a scheduling offset smaller than a threshold. In a case where the PDCCH and the PDSCH exist in different CCs, the UE applies a TCI state of the lowest TCI state ID within the activated BWP of the scheduled CC.

[0076] For example, in a case where the UE is configured with a CORESET associated with a search space set for cross-carrier scheduling, and the PDCCH carrying the DCI and the PDSCH scheduled by the DCI are transmitted in the same carrier, the UE assumes that tci-PresentInDCI is valid or tci-PresentInDCI-ForFormat1_2 is configured in the CORESET. Further, in a case where one or more TCI states configured for a serving cell scheduled by the search space set include “QCL-TypeD”, the UE assumes that a time offset (scheduling offset) between reception of the PDCCH detected by the search space set and reception of the corresponding PDSCH is above a threshold (timeDurationForQCL).

[0077] In a case where the PDCCH carrying the scheduling DCI is received through one component carrier and the PDSCH scheduled by the DCI is received through another component carrier, the following (1) and (2) can also be applied.

[0078] (1) The threshold is determined based on the subcarrier spacing of the scheduled PDSCH (μPDSCH). In a case where μPDCCH (subcarrier spacing of the PDCCH) < μPDSCH, an additional timing delay d is added to the threshold.

[0079] (2) In a case where tci-PresentInDCI is configured as “valid” and the offset between reception of the DL DCI and the corresponding PDSCH is smaller than the threshold, and in a case where tci-PresentInDCI is not configured, the UE obtains the QCL assumption (TCI state) of the scheduled PDSCH from the activated TCI state with the lowest ID that the UE can apply from the PDSCH of the activated BWP of the scheduled cell.

[0080] (Spatial relation for PUCCH)

[0081] The UE can also be configured with parameters (PUCCH configuration information, PUCCH-Config) used in PUCCH transmission through higher layer signaling (e.g., Radio Resource Control (RRC) signaling). The PUCCH configuration information can also be configured per each of the partial band (e.g., uplink bandwidth part (BWP)) within a carrier (also referred to as a cell, component carrier (CC)).

[0082] The PUCCH configuration information can also include a list of PUCCH resource set information (e.g., PUCCH-ResourceSet) and a list of PUCCH spatial relation information (e.g., PUCCH-SpatialRelationInfo).

[0083] The PUCCH resource set information can also include a list (e.g., resourceList) of PUCCH resource indices (IDs, e.g., PUCCH-ResourceId).

[0084] Further, in a case where the UE does not have dedicated PUCCH resource configuration information (e.g., dedicated PUCCH resource configuration) provided through the PUCCH resource set information within the PUCCH configuration information (before RRC configuration), the UE can also determine a PUCCH resource set based on parameters (e.g., pucch-ResourceCommon) within system information (e.g., System Information Block Type 1 (SIB1) or Remaining Minimum System Information (RMSI)). The PUCCH resource set can also include 16 PUCCH resources.

[0085] On the other hand, in a case where the UE has the above-described dedicated PUCCH resource configuration information (UE-specific uplink control channel configuration, dedicated PUCCH resource configuration) (after RRC configuration), the UE can also determine a PUCCH resource set in accordance with the number of UCI information bits.

[0086] The UE can also determine one PUCCH resource (index) within the above-mentioned PUCCH resource set (e.g., a PUCCH resource set determined cell-specifically or UE- specifically) based on at least one of a value of a field (e.g., a PUCCH resource indicator field) within a downlink control information (Downlink Control Information (DCI)) (e.g., a DCI format 1_0 or 1_1 used in scheduling of a PDSCH), a number of CCEs (N CCE ) within a control resource set (COntrol REsource SET (CORESET)) for a PDCCH reception carrying the DCI, and an index (n CCE,0 ) of a starting (first) CCE of the PDCCH reception.

[0087] PUCCH spatial relation information (e.g., a “PUCCH-spatialRelationInfo” of an RRC information element) can also indicate a plurality of candidate beams (spatial domain filters) for a PUCCH transmission. The PUCCH spatial relation information can also indicate an association in space between a RS (Reference signal) and a PUCCH.

[0088] A list of PUCCH spatial relation information can also contain several elements (PUCCH spatial relation information IEs (Information Elements)). Each PUCCH spatial relation information can contain, for example, at least one of an index (ID) of the PUCCH spatial relation information (e.g., pucch-SpatialRelationInfoId), an index (ID) of a serving cell (e.g., servingCellId), and information related to a RS (reference RS) that is spatially related to the PUCCH.

[0089] The information related to the RS can be, for example, an SSB index, a CSI-RS index (e.g., an NZP-CSI-RS resource structure ID), or an SRS resource ID, and an ID of a BWP. The SSB index, the CSI-RS index, and the SRS resource ID can be associated with at least one of a beam, a resource, and a port selected by measurement of the corresponding RS.

[0090] In a case where spatial relation information related to PUCCH is set to more than one, the UE can also be controlled so that one PUCCH spatial relation information becomes activated for one PUCCH resource in a certain time based on PUCCH spatial relation activation / deactivation MAC CE (PUCCH spatial relation Activation / Deactivation MAC CE).

[0091] The PUCCH spatial relation activation / deactivation MAC CE of Rel-15 NR can also be expressed as 3 octets (Octet, Oct) 1-3 in total (8 bits x 3 = 24 bits).

[0092] This MAC CE can also contain information such as an application target serving cell ID ("Serving Cell ID" field), BWP ID ("BWP ID" field), PUCCH resource ID ("PUCCH Resource ID" field), and the like.

[0093] In addition, this MAC CE contains "S i " field of i = 0-7. In a case where the field of a certain S i , the UE activates the spatial relation information of the spatial relation information ID #i. In a case where the field of a certain S i , the UE deactivates the spatial relation information of the spatial relation information ID #i.

[0094] The UE can also activate the PUCCH relation information designated by the MAC CE after 3 ms from the transmission of an acknowledgement (ACK) for the MAC CE for activating the PUCCH spatial relation information.

[0095] (TCI state application example)

[0096] Figure 1 is a diagram showing an example of DCI-based TCI control. In the example of Figure 1 , tci-PresentInDCI is set to be valid, and the scheduling offset is equal to or greater than a threshold value. In this case, control of the TCI state (DCI level) based on DCI is possible.

[0097] In Figure 1In this case, the UE applies the "TCI state #3 (TCI state #3)" in the PDSCH #1 that schedules the DCI.

[0098] Thus, in a case where a certain condition is satisfied, the UE can also determine the TCI state to be applied in the reception of the PDSCH scheduled by the DCI based on the field (e.g., the field for the TCI state) included in the DCI. Thereby, the UE can dynamically switch the DL beam at the DCI level.

[0099] On the other hand, in the existing system (e.g., Rel. 15, 16), the UL beam utilized in the transmission of the uplink control channel (PUCCH) is notified to the UE from the base station by the RRC signaling / MAC CE. The UL beam can also be replaced by the spatial relation or UL TCI state.

[0100] For example, in the existing system, a plurality of spatial relations are set by the RRC signaling per PUCCH resource or per PUCCH group, and one spatial relation is selected by the MAC CE. Each spatial relation can also correspond to a synchronization signal block (SSB) index. That is, in the existing system, a structure of dynamically switching the UL beam utilized in the transmission of the PUCCH at the DCI level is not supported.

[0101] Further, in the existing system, a structure of flexibly switching at the DCI level as with the PDSCH for the UL beam utilized in the transmission of the uplink shared channel (PUSCH) is not supported. For example, in a case where the PUSCH is scheduled by the DCI format 0_0, the spatial relation applied to the PUSCH can also be determined based on the spatial relation of the minimum PUCCH set in the activated UL BWP.

[0102] In a case where the PUSCH is scheduled by the DCI format 0_1, a structure of utilizing 1 or 2 bits of the SRI field included in the DCI to specify the spatial relation applied to the PUSCH is supported. However, compared to the PDSCH, a structure of flexibly switching the beam is not supported.

[0103] Thus, in the existing system, although the structure of flexibly switching the beam utilized in the reception of the downlink channel (e.g., PDSCH) at the DCI level is supported, the structure of flexibly switching the UL beam utilized in the transmission of the uplink channel (e.g., PUCCH / PUSCH) at the DCI level is not supported.

[0104] For example, in Figure 1 , a case where uplink control information (e.g., HARQ-ACK) for a PDSCH scheduled by DCI is transmitted using a PUCCH is assumed. In this case, as described above, the TCI state used in the PDSCH can be flexibly switched by the DCI level. On the other hand, the spatial relation (or TCI state) used in the PUCCH is decided based on a default spatial relation or based on a MAC CE indication. The default spatial relation can also be decided based on a TCI state corresponding to a control resource set (CORESET) used in the transmission of the DCI.

[0105] Thus, in the existing system, a method of aligning the DL beam of the PDSCH with the UL beam corresponding to the uplink channel (PUCCH / PUSCH) in a case where the HARQ-ACK corresponding to the PDSCH is transmitted in the uplink channel is not supported.

[0106] The inventors of the present application have researched a method of flexibly switching the UL beam (e.g., spatial relation / TCI state) applied in the transmission of the UL channel by the DCI level as well as the DL beam applied in the transmission of the DL channel (e.g., PDSCH), and conceived the present embodiment.

[0107] Hereinafter, the embodiments related to the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication method related to each embodiment and each mode can be applied individually or in combination. In addition, in the present disclosure, "A / B" can be replaced with "at least one of A and B". In addition, "notification" in the present disclosure can be replaced with each other as "indication", "setting", and "transmission".

[0108] In the following description, the spatial relation can also be referred to as spatial relation information. In addition, the so-called spatial relation decided based on the TCI state #X can be replaced with the spatial relation being the same as the type D reference signal set in the TCI state #X.

[0109] (First Mode)

[0110] In the first mode, a case where the spatial relation applied to the UL channel (e.g., PUCCH / PUSCH) is decided based on the TCI state applied to the DL channel (e.g., PDSCH) is described. In addition, the spatial relation can be replaced with the TCI state or the UL TCI state.

[0111] Figure 2An example of a case where a spatial relation used in transmission of an UL channel decided to be used in transmission of uplink control information (UCI) corresponding to PDSCH #1 is shown based on a TCI state used in reception of PDSCH #1. The uplink channel can also be referred to as an UL channel corresponding to DCI, or an UL channel corresponding to PDSCH.

[0112] Here, a case where a scheduling offset of PDSCH #1 scheduled by DCI (for example, an offset between DCI and PDSCH #1) is equal to or more than a threshold value, and a notification field of a TCI state (also referred to as a TCI state field) is included in the DCI is shown. The UE can also determine a TCI state (here, TCI state #3) used in reception of PDSCH #1 based on the TCI state field included in the DCI that schedules PDSCH #1.

[0113] Further, in Figure 2 , a case where UCI (for example, HARQ-ACK) corresponding to PDSCH #1 is transmitted in PUCCH is shown. The transmission timing of PUCCH, the PUCCH resource can also be indicated by the DCI that schedules PDSCH #1. The UE can also determine the transmission timing of the UL channel or the like based on the DCI.

[0114] The UE can also determine the spatial relation / TCI state applied to the UL channel based on at least one of the following options 1-1 to 1-2.

[0115] < Option 1-1 >

[0116] The UE can also determine the spatial relation / TCI state applied to the UL channel based on the TCI state applied to the corresponding PDSCH (refer to Figure 2 ). For example, the UE applies the TCI state (here, TCI state #3) applied to PDSCH #1 to the transmission of the UL channel (here, PUCCH).

[0117] Alternatively, the UE can also apply the spatial relation / UL TCI state associated with TCI state #3 to the UL channel transmission. The association of the DL TCI state and the spatial relation / UL TCI state can be defined in the specification, or can be notified to the UE from the base station using higher layer signaling or the like.

[0118] In this way, the spatial relation / TCI state of the UL channel is determined based on the TCI state of the PDSCH, and thus the spatial relation / TCI state for the UL channel can also be dynamically and flexibly controlled. Further, the TCI state of the PDSCH is applied to the UL channel, and thus the notification of the spatial relation information for the UL channel is not required, and the overhead can be reduced.

[0119] Option 1-1 can also be suitable for situations where DL beams and UL beams have / support a correspondence (beam compatibility).

[0120] <Options 1-2>

[0121] The UE can also determine the spatial relationship / TCI state applied to the UL channel based on information contained in the DCI corresponding to the UL channel (or the DCI of the PDSCH corresponding to the UL channel). For example, the spatial relationship / TCI state of the UL channel can also be determined based on specific fields contained in the DCI.

[0122] Specific fields used in the spatial relationship / TCI status notification of the UL channel can also be set commonly with fields used in the TCI status notification of the DL channel (e.g., PDSCH) (e.g., TCI status fields) (see reference). Figure 3 That is, notifications regarding the spatial relationship / TCI status of the UL channel and the TCI status of the PDSCH can also be set in a common field.

[0123] Alternatively, specific fields used in the spatial relationship / TCI status notification of the UL channel can be set separately from fields used in the TCI status notification of the DL channel (e.g., PDSCH) (see reference). Figure 4 That is, a separate field can also be set for notifying the spatial relationship / TCI status of the UL channel and the TCI status of the PDSCH.

[0124] [Public Fields]

[0125] Multiple TCI states can also be set for the PDSCH, and multiple spatial relationship / ULTCI states can be set for each UL channel (see reference). Figure 3 Here, the correspondence between the various TCI states used to configure the PDSCH and the code points of the TCI state fields included in the DCI is shown. Furthermore, the correspondence between the various spatial relationships used to configure the UL channel (here, PUCCH) and the code points of the TCI state fields included in the DCI is shown.

[0126] The TCI status for PDSCH and the spatial relationship / TCI status for UL channels can also be notified via common fields included in the DCI (e.g., TCI status fields). Here, the case where '011' is notified via a common field is shown.

[0127] The UE determines the TCI state for the PDSCH and the spatial relation / TCI state for the UL channel based on the bit information (e.g., codepoint) of the common field. Here, a case where the UE applies TCI state #3 (corresponding to '011') for PDSCH #1 and applies spatial relation #3 (corresponding to '011') for the UL channel is shown.

[0128] In Figure 3 , a case where the index of the TCI state for the PDSCH and the index of the spatial relation for the UL channel are the same for the same codepoint of the common field is shown, but is not limited thereto. The index of the TCI state for the PDSCH and the index of the spatial relation for the UL channel can also be set to be different for the same codepoint of the common field.

[0129] In this way, the spatial relation / TCI state for the UL channel is determined based on the corresponding DCI, whereby the spatial relation / TCI state for the UL channel can also be dynamically and flexibly controlled. Furthermore, the TCI state for the PDSCH and the spatial relation / TCI state for the UL channel are notified using the common field, whereby an increase in the overhead of the DCI can be suppressed.

[0130] Even in a case where the DL beam and the UL beam do not have / support a correspondence (beam correspondence) (e.g., a case where the spatial relation does not correspond to the DL RS but to the SRS resource), the specification of the common beam for the UL and the DL can be performed.

[0131] In addition, the UE can also be controlled so as to apply option 1-1 in a case where multiple spatial relations / UL TCI states are not set for the UL channel.

[0132] [Separate fields]

[0133] Multiple TCI states can also be set for the PDSCH, and multiple spatial relations / UL TCI states can be set per UL channel (refer to Figure 4 ). Here, a case where multiple TCI states for the PDSCH are set and the correspondence with the codepoint of the first field (e.g., TCI state field) included in the DCI is shown. Furthermore, a case where multiple spatial relations for the UL channel (here, PUCCH) are set and the correspondence with the codepoint of the second field (e.g., UL beam field, or spatial relation field) included in the DCI is shown.

[0134] The TCI state for the PDSCH can also be notified by a first field (DCI field #1) included in the DCI, and the spatial relation / TCI state for the UL channel can be notified by a second field (DCI field #2). Here, a case where '011' is notified by the first field and '001' is notified by the second field is shown.

[0135] The UE determines the TCI state for the PDSCH and the spatial relation / TCI state for the UL channel based on the bit information (for example, the codepoint) of the first field and the second field, respectively. Here, a case where the UE applies TCI state #3 (corresponding to '011') to PDSCH #1 and applies spatial relation #1 (corresponding to '001') to the UL channel is shown.

[0136] In Figure 4 In the above, a case where the index of the TCI state for the PDSCH and the index of the spatial relation for the UL channel are the same for the same codepoint of the common field is shown, but is not limited thereto. The index of the TCI state for the PDSCH and the index of the spatial relation for the UL channel can also be set to be different for the same codepoint of the common field.

[0137] In this way, the spatial relation / TCI state for the UL channel is determined based on the corresponding DCI, whereby the spatial relation / TCI state for the UL channel can also be dynamically and flexibly controlled. Further, the TCI state for the PDSCH and the spatial relation / TCI state for the UL channel are separately notified using separate fields, whereby the TCI state applied to the UL and the DL can be flexibly set.

[0138] [Application Condition]

[0139] The first method can also be configured to be applied in a case where at least one of the following application conditions 1-5 is satisfied.

[0140] [Application Condition 1]

[0141] Application condition 1 can also be a case where a field for the TCI state is set in the DCI. Whether the field for the TCI state is set in the DCI can also be set to the UE from the base station by higher layer signaling (for example, tci-PresentInDCI). The UE can also be controlled so as to apply the above-described option 1-1 or option 1-2 in a case where tci-PresentInDCI is set (for example, in a case where tci-PresentInDCI is set to enable).

[0142] [Application Condition 2]

[0143] The application condition 2 can also be a case where a scheduling offset (e.g., an offset between DCI and PDSCH) is above a certain threshold (e.g., timeDurationForQCL). The certain threshold can be determined based on UE capability or can be set to the UE from the base station.

[0144] [Application Condition 3]

[0145] The application condition 3-1 can also be a case where a spatial relation is not set per PUCCH resource. The PUCCH resource can also be replaced with an SRS resource corresponding to the SRI of the PUSCH. In other words, the same as the setting condition of the default spatial relation in Rel. 16 can also be applied. Further, in the case of considering compatibility with Rel. 15 / 16, the application condition 4 can also be applied in combination.

[0146] The application condition 3-2 can also be a case where a spatial relation for a PUCCH resource is set to a new parameter (e.g., PDSCH).

[0147] [Application Condition 4]

[0148] The application condition 4 can also be a case where the application of the operation corresponding to the first method is set / informed through RRC / MAC CE. That is, the operation corresponding to the first method can also be defined as an operation different from Rel. 15-16.

[0149] [Application Condition 5]

[0150] The application condition 5 can also be a case of non-cross carrier scheduling (or a case where cross carrier scheduling is not applied). That is, it can also be a case where a PDCCH and a PDSCH utilized in the transmission of DCI scheduling a PDSCH are received in the same CC.

[0151] <Changes>

[0152] In the above description, the PUCCH utilized in the transmission of HARQ-ACK is mainly exemplified and described, but is not limited thereto. For example, it can also be applied to UL channels triggered by DCI, UL transmissions such as aperiodic CSI (e.g., A-CSI transmitted in PUCCH / PUSCH), aperiodic SRS, etc.

[0153] In the above description, the specific field can also be replaced with a TCI state, a PRI, an SRI, a TDRA, or an FDRA.

[0154] Alternatively, the spatial relation of the PUCCH utilized in the transmission other than the HARQ-ACK, the periodic CSI (P-CSI), or the semi-persistent CSI (SP-CSI) can also be set by the same method as the existing system (e.g., Rel. 15 / 16).

[0155] Alternatively, the spatial relation of the PUCCH utilized in the transmission other than the HARQ-ACK, the periodic CSI (P-CSI), or the semi-persistent CSI (SP-CSI) can also be updated to be able to set the common UL beam and DL beam. For example, the spatial relation of the PUCCH utilized in the transmission other than the HARQ-ACK can also be applied to the TCI state of the most recent reception of PDSCH.

[0156] (Second Method)

[0157] In the second method, an example of the spatial relation / TCI state applied to the UL channel (e.g., PUCCH / PUSCH) in the case where cross carrier scheduling is applied is described.

[0158] In the case where a specific condition is satisfied in the case where cross carrier scheduling is applied, the TCI state applied to the reception of the PDSCH can be dynamically switched by the DCI level (refer to Figure 5 ). The specific condition can also be, for example, the case where the scheduling offset of the PDSCH scheduled by the DCI is above a threshold, and the TCI state is included in the DCI.

[0159] In Figure 5 , the case where the PDSCH#1 transmitted in CC#1 is scheduled by the DCI (or PDCCH) transmitted in CC#0 is shown. In this case, CC#1 can also be referred to as a scheduling CC, and CC#1 can also be referred to as a scheduled CC. The UE can also apply the TCI state (here, TCI state#3) notified by the TCI state field included in the DCI to control the reception of the PDSCH#1 transmitted in CC#2.

[0160] On the other hand, in the case where the UCI (e.g., HARQ-ACK) for the DCI or the PDSCH#1 is performed using the UL channel (e.g., PUCCH), how to control the spatial relation / TCI state applied to the UL channel becomes a problem.

[0161] In Figure 5In the middle, a case where a PUCCH set in CC#0 is utilized to transmit a HARQ-ACK for a PDSCH#1 transmitted in CC#1 is shown. In such a case, how to control in a case where a spatial relation / TCI state utilized in transmission of a PUCCH is dynamically switched by a DCI level becomes a problem.

[0162] Therefore, in the second manner, a TCI state list / spatial relation list is set per CC (or cell, carrier), and a spatial relation / TCI state applied to an UL channel is decided based on the TCI state list / spatial relation list set per CC.

[0163] In a case where cross-carrier scheduling is applied, the UE can also judge a spatial relation / TCI state applied to an UL channel based on at least one of the following options 2-1 to 2-3.

[0164] < Option 2-1 >

[0165] A TCI state list for a PDSCH can also be set per CC, and a spatial relation / TCI state applied to an UL channel is decided based on a TCI state list set for at least one CC scheduled by a DCI and the UL channel. On the other hand, a TCI state applied to a PDSCH can also be decided based on a TCI state list set for a CC where the PDSCH is transmitted.

[0166] The UE can also decide a spatial relation / TCI state applied to an UL channel based on information included in a DCI corresponding to the UL channel and a TCI state list corresponding to the DCI or a CC where the UL channel is transmitted. For example, a spatial relation / TCI state of an UL channel can also be decided based on a specific field included in a DCI.

[0167] A specific field utilized in notification of a spatial relation / TCI state of an UL channel can also be commonly set with a field (e.g., a TCI state field) utilized in notification of a TCI state of a DL channel (e.g., a PDSCH) (refer to Figure 6 ). That is, notification of a spatial relation / TCI state for an UL channel and notification of a TCI state of a PDSCH can also be set with a common field.

[0168] Alternatively, a specific field utilized in notification of a spatial relation / TCI state of an UL channel can also be separately set from a field utilized in notification of a TCI state of a DL channel (e.g., a PDSCH) (refer to Figure 7). That is, separate fields (independent fields) can also be set for the notification of the spatial relation / TCI state of the UL channel and the notification of the TCI state of the PDSCH.

[0169] [Common field]

[0170] The UE can also receive information related to the TCI state list for PDSCH set per CC through RRC signaling / MAC CE. In Figure 6 In the above, a case where a TCI state list for PDSCH corresponding to CC#0 and a TCI state list for PDSCH corresponding to CC#1 are set is shown. A case where a plurality of TCI states for PDSCH set in each TCI state list and the codepoint of the TCI state field included in the DCI are shown.

[0171] Both the TCI state applied to PDSCH#1 and the spatial relation / TCI state applied to the UL channel can also be notified through a common field (for example, the TCI state field) included in the DCI. Here, a case where '011' is notified through the common field is shown.

[0172] The UE determines the TCI state applied to the PDSCH transmitted in CC#1 and the spatial relation / TCI state applied to the UL channel transmitted in CC#0 based on the bit information (for example, the codepoint) of the common field, respectively. Here, a case where the UE applies TCI state #1-3 (corresponding to '011' of the TCI state list of CC#1) to PDSCH#1 and applies TCI state #0-3 (corresponding to '011' of the TCI state list of CC#0) to the UL channel is shown.

[0173] In this way, the spatial relation / TCI state of the UL channel is determined based on the information included in the DCI and the TCI state list corresponding to the UL channel or the CC in which the DCI is transmitted. Thereby, even in a case where the UL channel corresponding to the PDSCH is transmitted in a different CC, the spatial relation / TCI state for the UL channel can be dynamically and flexibly controlled. Further, the TCI state of the PDSCH and the spatial relation / TCI state of the UL channel are notified using the common field, whereby an increase in the overhead of the DCI can be suppressed.

[0174] [Separate fields]

[0175] The UE can also receive information related to the TCI state list for PDSCH set per CC through RRC signaling / MAC CE. In Figure 7In this case, a case where a TCI state list for PDSCH corresponding to CC#0 and a TCI state list for PDSCH corresponding to CC#1 are set is shown.

[0176] A case where a correspondence relation between a plurality of TCI states for PDSCH set in the TCI state list corresponding to CC#0 and a codepoint of the second field included in the DCI is shown. A case where a correspondence relation between a plurality of TCI states for PDSCH set in the TCI state list corresponding to CC#1 and a codepoint of the first field included in the DCI is shown.

[0177] A TCI state applied to PDSCH#1 transmitted in CC#1 can also be notified by the first field included in the DCI, and a spatial relation / TCI state applied to the UL channel transmitted in CC#0 can be notified by the second field. Here, a case where '011' is notified by the first field and '001' is notified by the second field is shown.

[0178] The UE determines a TCI state for PDSCH#1 and a spatial relation / TCI state for the UL channel based on the bit information (for example, a codepoint) of the first field and the second field, respectively. Here, a case where the UE applies TCI state #1-3 (corresponding to '011' of the TCI state list of CC#1) to PDSCH#1 and applies TCI state #0-1 (corresponding to '001' of the TCI state list of CC#0) to the UL channel is shown.

[0179] The TCI state list set per CC is separately designated using a separate field, whereby the spatial relation / TCI state for the UL channel can be dynamically and flexibly controlled even in a case where the UL channel corresponding to the PDSCH is transmitted in a different CC.

[0180] <Option 2-2>

[0181] A spatial relation / TCI state list for the UL channel can also be set per CC (or at least a CC in which the UL channel is transmitted). In this case, a spatial relation / TCI state applied to the UL channel can be determined based on a spatial relation / TCI state list for the UL channel set for the UL channel and at least one CC scheduled by the DCI. On the other hand, a TCI state applied to the PDSCH can be determined based on a TCI state list set for a CC in which the PDSCH is transmitted.

[0182] The UE can also determine the spatial relation / TCI state applied to the UL channel based on information included in the DCI corresponding to the UL channel and a list of spatial relations / TCI states for the UL channel corresponding to the CC in which the DCI or the UL channel is transmitted. For example, the spatial relation / TCI state for the UL channel can also be determined based on a specific field included in the DCI.

[0183] The specific field utilized in the specification of the spatial relation ID included in the list of spatial relations / TCI states for the UL channel can also be commonly set with the field (e.g., TCI state for field) utilized in the specification of the TCI state ID included in the list of TCI states for the PDSCH (refer to Figure 8 ). That is, the notification of the spatial relation / TCI state for the UL channel and the notification of the TCI state for the PDSCH can also be set with a common field.

[0184] Alternatively, the specific field utilized in the specification of the spatial relation ID included in the list of spatial relations / TCI states for the UL channel can also be separately set from the field (e.g., TCI state for field) utilized in the specification of the TCI state ID included in the list of TCI states for the PDSCH (refer to Figure 9 ). That is, separate fields (independent fields) can also be set for the notification of the spatial relation / TCI state for the UL channel and the notification of the TCI state for the PDSCH.

[0185] [Common Field]

[0186] The UE can also receive information related to the list of TCI states for the PDSCH and the list of spatial relations / TCI states for the UL channel set per CC through RRC signaling / MAC CE. In Figure 8 , a case in which a list of spatial relations / TCI states for the PUCCH corresponding to CC #0 and a list of TCI states for the PDSCH corresponding to CC #1 are set is shown.

[0187] A case in which a correspondence relationship between the spatial relation / TCI state for the PUCCH set in the list of spatial relations / TCI states for the PUCCH and the codepoint of the TCI state for field included in the DCI is shown. Further, a case in which a correspondence relationship between the plurality of TCI states for the PDSCH set in the list of TCI states for the PDSCH and the codepoint of the TCI state for field included in the DCI is shown.

[0188] Both the TCI state applied to PDSCH#1 and the spatial relation / TCI state applied to the UL channel can also be notified by a common field (e.g., TCI state use field) included in the DCI. Here, a case where '011' is notified by the common field is shown.

[0189] The UE determines the TCI state applied to PDSCH transmitted in CC#1 and the spatial relation / TCI state applied to the UL channel transmitted in CC#0 based on the bit information (e.g., codepoint) of the common field, respectively. Here, a case where the UE applies TCI state #1-3 (corresponding to '011' of the TCI state list for PDSCH of CC#1) to PDSCH#1 and applies spatial relation #3 (corresponding to '011' of the spatial relation / TCI state list for PUCCH of CC#0) to the UL channel is shown.

[0190] In this way, the spatial relation / TCI state list for the UL channel is set differently per CC from the TCI state list for PDSCH, whereby the spatial relation / TCI state for the UL channel can also be dynamically and flexibly controlled. Further, the TCI state for PDSCH and the spatial relation / TCI state for the UL channel are notified using a common field, whereby an increase in the overhead of the DCI can be suppressed.

[0191] [Separate fields]

[0192] The UE can also receive information related to the TCI state list for PDSCH and the spatial relation / TCI state list for the UL channel set per CC through RRC signaling / MAC CE. In Figure 9 Here, a case where the spatial relation / TCI state list for PUCCH corresponding to CC#0 and the TCI state list for PDSCH corresponding to CC#1 are set is shown.

[0193] A case where a plurality of spatial relations for PUCCH are set in the spatial relation / TCI state list for PUCCH corresponding to each CC (here, CC#0) and the correspondence relation with the codepoint of the second field included in the DCI is shown. A case where a plurality of TCI states for PDSCH are set in the TCI state list corresponding to each CC (here, CC#1) and the correspondence relation with the codepoint of the first field included in the DCI is shown.

[0194] The TCI state applied to PDSCH#1 transmitted in CC#1 can also be notified by a first field included in the DCI, and the spatial relation / TCI state applied to the UL channel transmitted in CC#0 can be notified by a second field. Here, a case where '011' is notified by the first field and '001' is notified by the second field is shown.

[0195] The UE determines the TCI state for PDSCH#1 and the spatial relation / TCI state for the UL channel based on the bit information (e.g., codepoint) of the first field and the second field, respectively. Here, a case where the UE applies TCI state #1-3 (corresponding to '011' of the TCI state list for PDSCH of CC#1) to PDSCH#1 and applies spatial relation #0-1 (corresponding to '001' of the spatial relation / TCI state list for PUCCH of CC#0) to the UL channel is shown.

[0196] In this way, the spatial relation / TCI state list for the UL channel is set differently for each CC with the TCI state list for PDSCH, and is designated using separate fields, whereby the spatial relation / TCI state for the UL channel can also be dynamically and flexibly controlled.

[0197] In addition, the separate fields can be set for each CC, or can be set for the TCI state list for PDSCH and the spatial relation / TCI state list for PUCCH, respectively.

[0198] <Option 2-3>

[0199] The spatial relation / TCI state applied to the UL channel can also be determined based on the TCI state applied to another signal / channel transmitted in the same CC as the CC in which the UL channel is transmitted. The other signal / channel can be either a PDSCH (refer to Figure 10 ), or a DL reference signal (refer to Figure 11 ).

[0200] Figure 10 A case where the spatial relation / TCI state applied to the UL channel is determined based on the TCI state of the most recently received PDSCH #2 (here, TCI state #0-1) in the same CC (here, CC#0) as the CC in which the UL channel is transmitted is shown. In addition, the most recent reception can also be counted based on the transmission timing of the UL channel, the reception timing of the scheduled PDSCH (here, PDSCH #1), or the reception timing of the DCI (or PDCCH) that schedules PDSCH #1.

[0201] Figure 11 A case where a spatial relation / TCI state applied to the UL channel is decided based on a TCI state (here, TCI state #0-1) of a DL reference signal (here, CSI-RS) most recently received in the same CC as a CC (here, CC #0) in which the UL channel is transmitted is shown. In addition, the most recent reception can also be counted based on a transmission timing of the UL channel, a reception timing of a scheduled PDSCH (here, PDSCH #1), or a reception timing of DCI (or PDCCH) that schedules PDSCH #1. The DL reference signal can also be limited to a reference signal (for example, aperiodic CSI-RS) of a beam (or TCI state) corresponding to the DCI.

[0202] (Wireless communication system)

[0203] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-described embodiments of the present disclosure or a combination thereof.

[0204] Figure 12 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 can also be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0205] Further, the wireless communication system 1 can also support dual connectivity between multiple radio access technologies (Multi-RAT Dual Connectivity (MR-DC)). The MR-DC can include E-UTRA-NR dual connectivity (E-UTRA-NR Dual Connectivity (EN-DC)), NR-E-UTRA dual connectivity (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0206] 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 Secondary Node (SN). In NE-DC, a base station (gNB) of NR is a MN, and a base station (eNB) of LTE (E-UTRA) is a SN.

[0207] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, both the MN and the SN are base stations (gNB) of NR (NR-NR Dual Connectivity (NN-DC))).

[0208] The wireless communication system 1 can also have a base station 11 that forms a macro cell C1 with a wide coverage, and base stations 12 (12a-12c) that are configured within the macro cell C1 and form small cells C2 that are narrower than the macro cell C1. The user terminal 20 can also be located within at least one cell. The configuration, number, and the like of the cells and the user terminal 20 are not limited to the manner shown in the drawing. Hereinafter, the base stations 11 and 12 are collectively referred to as base stations 10 without distinction.

[0209] The user terminal 20 can also be connected to at least one of the multiple base stations 10. The user terminal 20 can also use at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0210] Each CC can be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 can be included in the FR1, and the small cell C2 can be included in the FR2. For example, the FR1 can be a frequency band of 6 GHz or less (sub-6 GHz), and the FR2 can be a frequency band higher than 24 GHz (above-24 GHz). Note that the frequency bands, definitions, and the like of the FR1 and the FR2 are not limited to these, and for example, the FR1 can correspond to a frequency band higher than the FR2.

[0211] Furthermore, in each CC, the user terminal 20 can perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0212] The plurality of base stations 10 can also be connected through wired (for example, optical fiber based on Common Public Radio Interface (CPRI), X2 interface, or the like) or wireless (for example, NR communication). For example, in a case where NR communication is utilized as a backhaul between the base stations 11 and 12, the base station 11 equivalent to an upper station can also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station (relay) can also be referred to as an IAB node.

[0213] The base station 10 can also be connected to the core network 30 via another base station 10 or directly. The core network 30 can also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), or the like.

[0214] The user terminal 20 can also be a terminal that supports at least one of LTE, LTE-A, 5G, or the like.

[0215] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) can also be utilized. For example, in at least one of Downlink (DL) and Uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like can also be utilized.

[0216] The wireless access scheme can also be referred to as a waveform. In addition, in the wireless communication system 1, other wireless access schemes (for example, other single carrier transmission schemes, other multicarrier transmission schemes) can also be used in the wireless access schemes of UL and DL.

[0217] As a downlink channel, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared among the user terminals 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), and the like can also be used in the wireless communication system 1.

[0218] Further, as an uplink channel, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared among the user terminals 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), and the like can also be used in the wireless communication system 1.

[0219] User data, higher layer control information, a System Information Block (SIB), and the like are transmitted through the PDSCH. User data, higher layer control information, and the like can also be transmitted through the PUSCH. Further, a Master Information Block (MIB) can also be transmitted through the PBCH.

[0220] Lower layer control information can also be transmitted through the PDCCH. The lower layer control information can also contain, for example, downlink control information (Downlink Control Information (DCI)) containing scheduling information of at least one of the PDSCH and the PUSCH.

[0221] In addition, the DCI that schedules the PDSCH can also be referred to as a DL assignment, a DL DCI, and the like, and the DCI that schedules the PUSCH can also be referred to as an UL grant, an UL DCI, and the like. In addition, the PDSCH can also be replaced with DL data, and the PUSCH can also be replaced with UL data.

[0222] In the detection of the PDCCH, a control resource set (CORESET) and a search space can also be utilized. The CORESET corresponds to a resource in which the DCI is searched for. The search space corresponds to a search area of the PDCCH candidate and a search method. One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a certain search space based on a search space setting.

[0223] One search space can also correspond to the PDCCH candidate equivalent to one or more aggregation levels. One or more search spaces can also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", and the like of the present disclosure can also be replaced with each other.

[0224] Uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (for example, can also be referred to as a hybrid automatic repeat request acknowledgement (HARQ-ACK), ACK / NACK, and the like), and a scheduling request (SR) can also be transmitted through the PUCCH. A random access preamble for establishing a connection with a cell can also be transmitted through the PRACH.

[0225] In addition, in the present disclosure, "downlink", "uplink", and the like can also be expressed without "link". Furthermore, "physical" can also be expressed without "physical" at the beginning of various channels.

[0226] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like can also be transmitted. As the 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 can also be transmitted in the wireless communication system 1.

[0227] The synchronization signal can be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) can also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), or the like. In addition, the SS, the SSB, and the like can also be referred to as a reference signal.

[0228] Further, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), and the like can also be transmitted. In addition, the DMRS can also be referred to as a user terminal-specific reference signal (UE-specific Reference Signal).

[0229] (Base station)

[0230] Figure 13is a drawing showing an example of a structure of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission path interface (transmission line interface) 140. Note that the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140 can each be provided more than one.

[0231] Note that, in the present example, functional blocks of the characteristic portions in the present embodiment are mainly shown, and it is also conceivable that the base station 10 has other functional blocks required for wireless communication. Part of the processing of each unit described below can also be omitted.

[0232] The control unit 110 implements control of the entire base station 10. The control unit 110 can be constituted by a controller, a control circuit, or the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0233] The control unit 110 can also control generation of signals, scheduling (for example, resource allocation, mapping), and the like. The control unit 110 can also 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 can also generate data, control information, a sequence, and the like transmitted as signals, and forward them to the transmission / reception unit 120. The control unit 110 can also perform call processing (setting, release, and the like) of a communication channel, state management of the base station 10, management of wireless resources, and the like.

[0234] The transmission / reception unit 120 can include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 can include a transmission processing unit 1211 and a reception processing unit 1212. The transmission / reception unit 120 can be constituted by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0235] The transmission / reception unit 120 can be constituted as an integrated transmission / reception unit, or can be constituted by a transmission unit and a reception unit. The transmission unit can be constituted by the transmission processing unit 1211 and the RF unit 122. The reception unit can be constituted by the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

[0236] The transmission / reception antenna 130 can be constituted by an antenna such as an array antenna and the like, which can be explained based on common knowledge in the technical field to which the present disclosure pertains.

[0237] The transmission / reception unit 120 can also transmit the downlink channel, the synchronization signal, the downlink reference signal, and the like described above. The transmission / reception unit 120 can also receive the uplink channel, the uplink reference signal, and the like described above.

[0238] The transmission / reception unit 120 can also form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.

[0239] The transmission / reception unit 120 (transmission processing unit 1211) can also generate a bit string to be transmitted, for example, by performing processing of a Packet Data Convergence Protocol (PDCP) layer, processing of a Radio Link Control (RLC) layer (for example, RLC retransmission control), processing of a Medium Access Control (MAC) layer (for example, HARQ retransmission control), and the like, with respect to data, control information, and the like acquired from the control unit 110.

[0240] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing of channel coding (which can include error correction coding), modulation, mapping, filter processing (filtering processing), Discrete Fourier Transform (DFT) processing (as necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-analog conversion, and the like, with respect to the bit string to be transmitted, and output a baseband signal.

[0241] The transmission / reception unit 120 (RF unit 122) can also perform modulation to a wireless band, filter processing, amplification, and the like with respect to the baseband signal, and transmit a signal of the wireless band via the transmission / reception antenna 130.

[0242] On the other hand, the transmission / reception unit 120 (RF unit 122) can also perform amplification, filter processing, demodulation to a baseband signal, and the like with respect to a signal of the wireless band received by the transmission / reception antenna 130.

[0243] The transmission / reception unit 120 (reception processing unit 1212) can also apply, to the acquired baseband signal, reception processing such as analog-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (as necessary), filter processing, demapping, demodulation, decoding (which can also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, and the like, and acquire user data and the like.

[0244] The transmission / reception unit 120 (measurement unit 123) can also perform measurement related to the received signal. For example, the measurement unit 123 can also perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, and the like, based on the received signal. The measurement unit 123 can also perform measurement with respect to received power (for example, Reference Signal Received Power (RSRP)), reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (for example, Received Signal Strength Indicator (RSSI)), propagation path information (for example, CSI), and the like. The measurement result can also be output to the control unit 110.

[0245] The transmission path interface 140 can also transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, and the like, and can also acquire, transmit, and the like, user data (user plane data), control plane data, and the like, for the user terminal 20.

[0246] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure can also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0247] The transmission / reception unit 120 can also transmit a downlink shared channel scheduled by the downlink control information. The transmission / reception unit 120 can also receive an uplink channel whose spatial relation or TCI state is decided based on at least one of a list of TCI states or a list of spatial relations set per cell and information notified by the downlink control information.

[0248] The transmission / reception unit 120 can also transmit downlink control information and a downlink shared channel scheduled by the downlink control information in a different cell from the downlink control information. The transmission / reception unit 120 can also receive an uplink channel whose spatial relation or TCI state is decided based on at least one of a list of TCI states or a list of spatial relations set per cell and information notified by the downlink control information.

[0249] (User terminal)

[0250] Figure 14 is a diagram showing an example of a structure of a user terminal according to an embodiment. The user terminal 20 is provided with a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 can be provided.

[0251] In addition, in this example, mainly functional blocks of characteristic parts in the present embodiment are shown, and it can be also assumed that the user terminal 20 has other functional blocks necessary for wireless communication. Part of the processing of each unit described below can also be omitted.

[0252] The control unit 210 implements control of the entire user terminal 20. The control unit 210 can be constituted by a controller, a control circuit, or the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0253] The control unit 210 can also control generation, mapping, and the like of a signal. The control unit 210 can also control transmission / reception, measurement, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, a sequence, and the like transmitted as a signal, and forward to the transmission / reception unit 220.

[0254] The transmission / reception unit 220 can also include a baseband unit 221, an RF unit 222, a measurement unit 223. The baseband unit 221 can also include a transmission processing unit 2211, a reception processing unit 2212. The transmission / reception unit 220 can be constituted by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0255] The transmission / reception unit 220 can be configured as an integrated transmission / reception unit, or can be configured of a transmission unit and a reception unit. The transmission unit can be configured of the transmission processing unit 2211, the RF unit 222. The reception unit can be configured of the reception processing unit 2212, the RF unit 222, the measurement unit 223.

[0256] The transmission / reception antenna 230 can be configured of an antenna such as an array antenna, which can be explained based on common knowledge in the technical field to which the present disclosure pertains.

[0257] The transmission / reception unit 220 can also receive the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transmission / reception unit 220 can also transmit the above-described uplink channel, uplink reference signal, and the like.

[0258] The transmission / reception unit 220 can also use digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like, to form at least one of a transmission beam and a reception beam.

[0259] The transmission / reception unit 220 (transmission processing unit 2211) can also, for example, perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), and the like, with respect to data, control information, and the like, acquired from the control unit 210, to generate a bit string to be transmitted.

[0260] The transmission / reception unit 220 (transmission processing unit 2211) can also perform channel coding (which can include error correction coding), modulation, mapping, filter processing, DFT processing (as necessary), IFFT processing, precoding, digital-analog conversion, and the like, with respect to the bit string to be transmitted, to output a baseband signal.

[0261] In addition, whether or not to apply DFT processing can also be based on the setting of transform precoding. With respect to a certain channel (for example, PUSCH), in a case where transform precoding is effective (enabled), the transmission / reception unit 220 (transmission processing unit 2211) can also perform DFT processing as the above-described transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, and in a case where this is not so, the transmission / reception unit 220 (transmission processing unit 2211) can also not perform DFT processing as the above-described transmission processing.

[0262] The transmission / reception unit 220 (RF unit 222) can also perform modulation to a radio frequency band, filter processing, amplification, and the like, with respect to the baseband signal, to transmit a signal of the radio frequency band via the transmission / reception antenna 230.

[0263] On the other hand, the transmission / reception unit 220 (RF unit 222) can also perform amplification, filter processing, demodulation to a baseband signal, and the like with respect to a signal of a radio band received through the transmission / reception antenna 230.

[0264] The transmission / reception unit 220 (reception processing unit 2212) can also apply reception processing such as analog-digital conversion, FFT processing, IDFT processing (as necessary), filter processing, demapping, demodulation, decoding (may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, and the like with respect to the acquired baseband signal, and acquire user data and the like.

[0265] The transmission / reception unit 220 (measurement unit 223) can also perform measurement related to a received signal. For example, the measurement unit 223 can also perform RRM measurement, CSI measurement, and the like based on the received signal. The measurement unit 223 can also perform measurement with respect to reception power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like. The measurement result can also be output to the control unit 210.

[0266] In addition, the transmission unit and the reception unit of the user terminal 20 in the present disclosure can also be constituted by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0267] The transmission / reception unit 220 can also receive a downlink shared channel scheduled by the downlink control information. Alternatively, the transmission / reception unit 220 can also receive the downlink control information and a downlink shared channel scheduled by the downlink control information in a different cell from the downlink control information.

[0268] The control unit 210 can also determine a spatial relation or a TCI state applied to an uplink channel corresponding to the downlink control information based on at least one of a TCI state applied to the downlink shared channel and information notified by the downlink control information.

[0269] For example, the control unit 210 can also determine a TCI state applied to the downlink shared channel and a spatial relation or a TCI state applied to the uplink channel based on a common bit field included in the downlink control information. Alternatively, the control unit 210 can also determine a TCI state applied to the downlink shared channel based on a first bit field included in the downlink control information, and determine a spatial relation or a TCI state applied to the uplink channel based on a second bit field.

[0270] The control unit 210 can also determine the spatial relation or the TCI state applied to the uplink channel corresponding to the downlink control information based on at least one of the list of TCI states or the list of spatial relations set per cell and the information notified by the downlink control information.

[0271] For example, the control unit 210 can also determine the TCI state applied to the downlink shared channel and the spatial relation or the TCI state applied to the uplink channel based on a common bit field included in the downlink control information. Alternatively, the control unit 210 can also determine the TCI state applied to the downlink shared channel based on a first bit field included in the downlink control information and determine the spatial relation or the TCI state applied to the uplink channel based on a second bit field. Alternatively, the control unit 210 can apply the spatial relation or the TCI state corresponding to the downlink shared channel or the reference signal transmitted in the cell in which the uplink channel is transmitted to the uplink channel in a case where the spatial relation or the TCI state corresponding to the uplink channel is not notified by the downlink control information.

[0272] (Hardware structure)

[0273] In addition, the block diagrams used in the description of the above-described embodiments show blocks of functional units. These functional blocks (structural units) are realized by any combination of hardware and software of at least one of them. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block can be realized by one device physically or logically combined, or by a plurality of devices physically or logically separated and connected directly or indirectly (for example, by wire, wireless, or the like). Each functional block can also be realized by combining the above-described one device or the above-described plurality of devices with software.

[0274] Here, among the functions, there are judgment, determination, decision, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, and the like, but are not limited to these. For example, a functional block (structural unit) that realizes a transmission function can also be referred to as a transmitting unit, a transmitter, or the like. Any one of these is as described above, and the method of realization is not particularly limited.

[0275] For example, the base station, the user terminal, and the like in an embodiment of the present disclosure can also function as a computer that performs the processing of the wireless communication method of the present disclosure. Figure 15 is a diagram illustrating an example of a hardware structure of a base station and a user terminal according to an embodiment. The base station 10 and the user terminal 20 described above can also 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.

[0276] In addition, in the present disclosure, the terms of device, circuit, apparatus, section, unit, and the like can be replaced with each other. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of each device illustrated in the diagram, or can be configured not to include a part of the devices.

[0277] For example, the processor 1001 is illustrated as one, but there can be a plurality of processors. Furthermore, the processing can be performed by one processor, or can be performed by two or more processors simultaneously, sequentially, or by other methods. In addition, the processor 1001 can be realized by one or more chips.

[0278] As for each function in the base station 10 and the user terminal 20, at least one of the operation and the control of the communication via the communication device 1004, or the readout and the writing of the data in the memory 1002 and the storage 1003 is realized by the processor 1001, for example, by reading a specific software (program) into the hardware such as the processor 1001 and the memory 1002, and performing the operation and the control.

[0279] The processor 1001 causes, for example, an operating system to operate to control the entire computer. The processor 1001 can also be constituted by a central processing device (Central Processing Unit (CPU)) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, at least a part of the control unit 110 (210), the transmission and reception unit 120 (220), and the like described above can also be realized by the processor 1001.

[0280] Furthermore, the processor 1001 reads out a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processing according to them. As the program, a program that causes a computer to perform at least a part of the operations described in the above-described embodiments can be used. For example, the control unit 110 (210) can also be realized by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be applied to other functional blocks.

[0281] The memory 1002 can also be a computer-readable recording medium such as at least one of a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), other appropriate types of storage media. The memory 1002 can also be referred to as a register, a cache, a main memory, and the like. The memory 1002 can store programs (program codes), software modules, and the like, which are executable for implementing the wireless communication method according to an embodiment of the present disclosure.

[0282] The storage 1003 can also be a computer-readable recording medium such as at least one of a flexible disc, a Floppy (registered trademark) disc, a magneto-optical disc (e.g., a Compact Disc (Compact Disc ROM (CD-ROM) or the like), a Digital Versatile Disc, a Blu-ray (registered trademark) disc), a removable disc, a hard disk drive, an intelligent card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, other appropriate types of storage media. The storage 1003 can also be referred to as an auxiliary storage device.

[0283] 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, such as a network device, a network controller, a network card, a communication module, and the like. The communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like, in order to implement at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). The transmission-reception unit 120 (220), the transmission-reception antenna 130 (230), and the like described above can also be implemented by the communication device 1004. The transmission-reception unit 120 (220) can also be implemented by a transmission unit 120a (220a) and a reception unit 120b (220b) which are physically or logically separated.

[0284] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, or the like) that receives an input from an outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, or the like) that performs an output to the outside. In addition, the input device 1005 and the output device 1006 can also be a structure that is integrated (e.g., a touch panel).

[0285] Further, the processor 1001, the memory 1002, and the like are connected through a bus 1007 for communicating information. The bus 1007 can be constituted by a single bus, or can be constituted by different buses among the devices.

[0286] Further, the base station 10 and the user terminal 20 can also be configured to include a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), or the like, and a part or all of the functional blocks can be implemented by the hardware. For example, the processor 1001 can also be implemented using at least one of these hardware.

[0287] (Modified Example)

[0288] In addition, the terms described in the present disclosure and the terms necessary for understanding the present disclosure can also be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (a signal or signaling) can also be replaced with each other. Further, a signal can also be a message. A Reference Signal (RS) can also be simply referred to as RS, and can also be referred to as a Pilot, a Pilot signal, or the like, depending on the applied standard. Further, a Component Carrier (CC) can also be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

[0289] A radio frame can also be constituted by one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting the radio frame can also be referred to as a subframe. Further, a subframe can also be constituted by one or more slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) independent of numerology.

[0290] Here, the numerology can also refer to communication parameters applied in at least one of transmission and reception of a certain signal or channel. For example, the numerology can 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 processing performed by a transmitter-receiver in a frequency domain, a specific windowing processing performed by the transmitter-receiver in a time domain, and the like.

[0291] A slot can also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, and the like) in a time domain. Also, a slot can be a time unit based on numerology.

[0292] A slot can also contain a plurality of mini-slots. Each mini-slot can also be composed of one or more symbols in a time domain. Also, a mini-slot can be referred to as a sub-slot. A mini-slot can also be composed of a smaller number of symbols than a slot. A PDSCH (or PUSCH) transmitted in a larger time unit than a mini-slot can also be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot can also be referred to as PDSCH (PUSCH) mapping type B.

[0293] A radio frame, a subframe, a slot, a mini-slot, and a symbol each represent a time unit for transmitting a signal. A radio frame, a subframe, a slot, a mini-slot, and a symbol can also use other names corresponding to each. Also, the time units of frame, subframe, slot, mini-slot, symbol, and the like in the disclosure can be replaced with each other.

[0294] For example, one subframe can also be referred to as a TTI, a plurality of consecutive subframes can also be referred to as a TTI, one slot or one mini-slot can also be referred to as a TTI. That is, at least one of a subframe and a TTI can be a subframe (1 ms) in the existing LTE, can be a period shorter than 1 ms (for example, 1-13 symbols), or can be a period longer than 1 ms. Also, a unit representing a TTI can not be referred to as a subframe, but can be referred to as a slot, a mini-slot, or the like.

[0295] Here, the TTI refers to, for example, a minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling in which radio resources (frequency bandwidth, transmission power, and the like that can be used in each user terminal) are allocated to each user terminal in TTI units. Note that the definition of the TTI is not limited to this.

[0296] The TTI can also be a transmission time unit of a data packet (transport block), a code block, a code word, or the like that has been subjected to channel coding, and can also be a processing unit of scheduling, link adaptation, or the like. Note that when the TTI is given, the time interval (for example, the number of symbols) to which a transport block, a code block, a code word, or the like is actually mapped can also be shorter than the TTI.

[0297] Note that in a case where one slot or one mini-slot is referred to as a TTI, one or more TTIs (that is, one or more slots or one or more mini-slots) can also be a minimum time unit of scheduling. Furthermore, the number of slots (the number of mini-slots) that constitute the minimum time unit of scheduling can also be controlled.

[0298] A TTI having a time length of 1 ms can 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, or the like. A TTI shorter than the normal TTI can 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, or the like.

[0299] Note that the long TTI (for example, the normal TTI, the subframe, or the like) can also be replaced with a TTI having a time length longer than 1 ms, and the short TTI (for example, the shortened TTI, or the like) can also be replaced with a TTI having a TTI length shorter than the long TTI and a TTI length of 1 ms or more.

[0300] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and can also include one or more continuous subcarriers in the frequency domain. The number of subcarriers included in the RB can also be the same regardless of the numerology, and can also be 12, for example. The number of subcarriers included in the RB can also be determined based on the numerology.

[0301] Furthermore, the RB can also include one or more symbols in the time domain, and can also be the length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, or the like can also be constituted by one or more resource blocks, respectively.

[0302] In addition, one or a plurality of RBs can also be referred to as a physical RB (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, or the like.

[0303] In addition, a resource block can also be composed of one or a plurality of resource elements (Resource Element (RE)). For example, one RE can also be a wireless resource area of one sub-carrier and one symbol.

[0304] A bandwidth part (Bandwidth Part (BWP)) (may also be referred to as a partial bandwidth, etc.) can also indicate a subset of contiguous common RBs (common resource blocks) for a certain numerology in a certain carrier. Here, the common RBs can be determined by the index of the RBs with reference to a common reference point of the carrier. The PRB can also be defined in a certain BWP and additionally numbered within the BWP.

[0305] The UL BWP (BWP for UL) and the DL BWP (BWP for DL) can also be included in the BWP. For the UE, one or a plurality of BWPs can also be configured within one carrier.

[0306] At least one of the configured BWPs can also be activated, and the UE can not be assumed to transmit and receive a specific signal / channel outside the activated BWP. In addition, "cell", "carrier", and the like in the present disclosure can also be replaced with "BWP".

[0307] In addition, the above-described structures of the radio frame, the subframe, the slot, the mini-slot, and the symbol, and the like are merely examples. For example, the number of subframes included in the radio frame, the number of slots of each subframe or radio frame, the number of mini-slots included in the slot, the number of symbols and RBs included in the slot or mini-slot, the number of subcarriers included in the RB, and the number of symbols, symbol length, cyclic prefix (Cyclic Prefix (CP)) length, and the like within the TTI can be variously changed.

[0308] In addition, the information, parameters, and the like described in the present disclosure can be expressed by an absolute value, can be expressed by a relative value with respect to a specific value, and can also be expressed by corresponding other information. For example, a wireless resource can also be indicated by a specific index.

[0309] In the present disclosure, names used for parameters and the like are not names in all respects that are limiting. Furthermore, mathematical expressions and the like using these parameters can also be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, and the like) and information elements can be identified by any appropriate names, and thus various names assigned to these various channels and information elements are not names in all respects that are limiting.

[0310] Information, signals, and the like described in the present disclosure can also be represented by any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0311] Furthermore, information, signals, and the like can be outputted in at least one direction, i.e., from higher layers (upper layers) to lower layers (lower layers) and from lower layers to higher layers. Information, signals, and the like can also be inputted / outputted via a plurality of network nodes.

[0312] Information, signals, and the like inputted / outputted can be stored in a specific location (e.g., a memory) and can be managed using a management table. Information, signals, and the like inputted / outputted can be overwritten, updated, or appended. Information, signals, and the like outputted can be deleted. Information, signals, and the like inputted can be transmitted to other devices.

[0313] Notification of information is not limited to the manners / embodiments described in the present disclosure and can be performed using other methods. For example, notification of information in the present disclosure can also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), and the like), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0314] In addition, the physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like. Furthermore, the RRC signaling can also be referred to as an RRC message, for example, can also be an RRC connection setup message, an RRC connection reconfiguration message, and the like. Furthermore, the MAC signaling can also be notified using a MAC control element (CE), for example.

[0315] Furthermore, the notification of the specific information (for example, the notification of "X") is not limited to the explicit notification, but can also be performed implicitly (for example, by not performing the notification of the specific information, or by the notification of other information).

[0316] The determination can be performed by a value represented by one bit (0 or 1), can also be performed by a true / false value (Boolean value) represented by true or false, and can also be performed by a comparison of numerical values (for example, a comparison with a specific value).

[0317] Software, regardless of being referred to as software, firmware, middle-ware, microcode, hardware description language, or by other names, should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, and the like.

[0318] Moreover, software, instructions, information, etc. can also be transmitted as encoded signals using transmission media or communication media through a variety of wired interfaces (coaxial cables, fiber optic cables, twisted pair, digital subscriber line (DSL), etc.) and / or wireless interfaces (infrared, microwave, etc.). When transmitted as encoded signals, the software, instructions, information, etc. can be transmitted using any media, including transmission media or communication media, through which digital data signals can be transmitted.

[0319] The terms "system" and "network" used in the present disclosure can be used interchangeably. The "network" can also mean an apparatus (e.g., a base station) included in the network.

[0320] In the present disclosure, the terms "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", etc. can be used interchangeably.

[0321] In the present disclosure, the terms "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. can be used interchangeably. There are cases where the base station is called with the terms macro cell, small cell, femto cell, pico cell, etc.

[0322] A base station can accommodate one or a plurality of (for example, three) cells. In a case where a base station accommodates a plurality of cells, the coverage area of the base station as a whole can be divided into a plurality of smaller areas, each of which can also be provided with communication services by a base station subsystem (for example, a small-sized base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of a base station and a base station subsystem that provides communication services within the coverage.

[0323] In the present disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", and the like can be used interchangeably.

[0324] There are also cases where a mobile station is called a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a hand set, a user agent, a mobile client, a client, or a number of other appropriate terms.

[0325] At least one of a base station and a mobile station can also be called a transmission device, a reception device, a wireless communication device, and the like. In addition, at least one of a base station and a mobile station can also be a device mounted on a mobile body, a mobile body itself, and the like. The mobile body can be a vehicle (for example, a car, an airplane, and the like), a mobile body that moves in a unmanned manner (for example, a drone, an automated driving vehicle, and the like), and a robot (manned or unmanned). In addition, at least one of a base station and a mobile station also includes a device that does not necessarily move when performing a communication operation. For example, at least one of a base station and a mobile station can also be a sensor and the like Internet of Things (IoT) device.

[0326] Furthermore, the base station in the present disclosure can also be replaced with a user terminal. For example, for a structure in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (for example, also referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), and the like), each of the modes / embodiments of the present disclosure can also be applied. In this case, a structure in which the user terminal 20 has the functions of the base station 10 described above can also be provided. Furthermore, the terms "uplink", "downlink", and the like can also be replaced with terms corresponding to inter-terminal communication (for example, "side"). For example, the uplink channel, the downlink channel, and the like can also be replaced with a side channel.

[0327] Likewise, the user terminal in the present disclosure can also be replaced with a base station. In this case, a structure in which the base station 10 has the functions of the user terminal 20 described above can also be provided.

[0328] In the present disclosure, an action performed by a base station is sometimes also performed by an upper node thereof depending on the situation. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, consider a Mobility Management Entity (MME), a Serving-Gateway (S-GW), and the like, but not limited to these), or a combination thereof.

[0329] Each of the modes / embodiments described in the present disclosure can be used alone or in combination, and can also be used in switching as execution proceeds. Furthermore, the processing procedure, sequence, flowchart, and the like of each of the modes / embodiments described in the present disclosure can also be reversed in order as long as there is no contradiction. For example, for the method described in the present disclosure, the elements of various steps are prompted using the order of the examples, but are not limited to the specific order prompted.

[0330] The modes / embodiments explained in the present disclosure can also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer, a decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, next-generation systems extended based on them, and the like. Furthermore, a plurality of systems can also be combined (for example, LTE or LTE-A, in combination with 5G, and the like) to be applied.

[0331] The recitation "based on" used in the present disclosure does not mean "only based on" unless specifically written. In other words, the recitation "based on" means both "only based on" and "at least based on".

[0332] The term "determining" as used in the present disclosure can encompass a wide variety of actions. For example, "determining" can include calculating, computing, processing, deriving, investigating, looking up (such as looking up in a table, a database or another data structure), ascertaining and the like. Also, "determining" can include receiving (such as receiving information), accessing (such as accessing data in a memory) and the like.

[0333] Also, "determining" can include resolving, selecting, choosing, establishing and the like.

[0334] Also, "determining" can include resolving, selecting, choosing, establishing and the like.

[0335] Also, "determining" can be replaced with "assuming," "expecting," "considering" and the like.

[0336] The term "connected," "coupled," or any variant thereof, as used in the present disclosure, indicates either a direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between any two elements. The coupling or connection between the elements can be physical, logical or a combination thereof. For example, "connected" can be replaced with "accessed."

[0337] In the present disclosure, in the case where two elements are connected, it is possible to consider the use of one or more electric wires, cables, printed electric connections, and the like, and to be "connected" or "combined" with each other using electromagnetic energy having a wavelength in the wireless frequency domain, the microwave region, the light (both visible and non-visible) region, and the like, as several non-limiting and non-inclusive examples.

[0338] In the present disclosure, the term "A is different from B" can also mean "A and B are different from each other". In addition, the term can also mean "A and B are different from C, respectively". The terms "separate", "combine", and the like can also be interpreted in the same way as "different".

[0339] In the present disclosure, in the case where "include", "including", and variations thereof are used, these terms mean the same as the term "comprising" and are inclusive. Further, the term "or" used in the present disclosure does not mean the same as the term "exclusive or".

[0340] In the present disclosure, in the case where a definite article is added by translation, for example, a, an, and the in English, the present disclosure can also include the case where the noun following these definite articles is plural.

[0341] The above has been described in detail with respect to the invention to which the present disclosure relates, but the invention to which the present disclosure relates is obviously not limited to the embodiments described in the present disclosure. The invention to which the present disclosure relates can be implemented as a modification and a variation without departing from the spirit and scope of the invention determined based on the recitations of the claims. Therefore, the recitations of the present disclosure are intended for the purpose of illustrative explanation and do not have any limiting meaning with respect to the invention to which the present disclosure relates.

Claims

1. A terminal having: a reception unit that receives downlink control information including a field utilized in transmission of an indication of a configured indication state, a TCI state; and a control unit that determines an index of a DL TCI state corresponding to a downlink channel based on a codepoint notified by the field, and determines an index of a UL TCI state corresponding to an uplink channel different from the index of the DL TCI state based on the codepoint, in a case where a parameter indicating a plurality of DL TCI states or a plurality of UL TCI states is configured by higher layer signaling and a spatial relation is not configured per each sounding reference signal (SRS) resource, the control unit determines the UL TCI state corresponding to the SRS resource based on the codepoint.

2. A wireless communication method of a terminal having: a step of receiving downlink control information including a field utilized in transmission of an indication of a configured indication state, a TCI state; a step of determining an index of a DL TCI state corresponding to a downlink channel based on a codepoint notified by the field; a step of determining an index of a UL TCI state corresponding to an uplink channel different from the index of the DL TCI state based on the codepoint; and a step of, in a case where a parameter indicating a plurality of DL TCI states or a plurality of UL TCI states is configured by higher layer signaling and a spatial relation is not configured per each sounding reference signal (SRS) resource, determining the UL TCI state corresponding to the SRS resource based on the codepoint.

3. A base station having: a transmission unit that transmits downlink control information including a field utilized in transmission of an indication of a configured indication state, a TCI state; and a control unit that indicates an index of a DL TCI state corresponding to a downlink channel based on a codepoint notified by the field, and indicates an index of a UL TCI state corresponding to an uplink channel different from the index of the DL TCI state based on the codepoint, in a case where a parameter indicating a plurality of DL TCI states or a plurality of UL TCI states is configured by higher layer signaling and a spatial relation is not configured per each sounding reference signal (SRS) resource, the control unit indicates the UL TCI state corresponding to the SRS resource based on the codepoint.

4. A system having a terminal and a base station, the terminal having: a reception unit that receives downlink control information including a field utilized in transmission of an indication of a configured indication state, a TCI state; and a control unit that determines an index of a DL TCI state corresponding to a downlink channel based on a codepoint notified by the field, and determines an index of a UL TCI state corresponding to an uplink channel different from the index of the DL TCI state based on the codepoint, in a case where a parameter indicating a plurality of DL TCI states or a plurality of UL TCI states is configured by higher layer signaling and a spatial relation is not configured per each sounding reference signal (SRS) resource, the control unit determines the UL TCI state corresponding to the SRS resource based on the codepoint, the base station having: a transmission unit that transmits downlink control information including a field utilized in transmission of an indication of a configured indication state, a TCI state; and a control unit that indicates an index of a DL TCI state corresponding to a downlink channel based on a codepoint notified by the field, and indicates an index of a UL TCI state corresponding to an uplink channel different from the index of the DL TCI state based on the codepoint, in a case where a parameter indicating a plurality of DL TCI states or a plurality of UL TCI states is configured by higher layer signaling and a spatial relation is not configured per each sounding reference signal (SRS) resource, the control unit indicates the UL TCI state corresponding to the SRS resource based on the codepoint. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The receiving unit receives downlink control information including a field utilized in indication of a transmission configuration indication state, i.e., a TCI state. ​ ​ ​ ​ a sending unit, configured to send the downlink control information; and a control unit, configured to indicate an index of a DL TCI state corresponding to a downlink channel based on a codepoint notified by the field, and indicate an index of a UL TCI state corresponding to an uplink channel different from the index of the DL TCI state based on the codepoint.

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