Terminal, wireless communication method, base station and system

Abstract

A terminal according to one embodiment of the present disclosure has: a reception unit for receiving a radio resource control (RRC) parameter for transmission configuration indication states (TCI states), the RRC parameter being usable as TCI states for downlinks (DLs) and as TCI states for uplinks (ULs); and a control unit for determining, on the basis of the TCI-state-related set with which the RRC parameter is associated, that the RRC parameter is usable for the TCI states for DLs and / or the TCI states for ULs. According to one embodiment of the present disclosure, it is possible to appropriately control TCI states.

Description

[Technical field]

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

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been specified for the purpose of achieving higher data rates and lower latency (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of achieving higher capacity and greater sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

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

[0004] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention [Problem to be solved by the invention]

[0005] In NR, the use of a UL transmission configuration indication state (TCI state) is being considered as a beam (precoder) indication method for the uplink (UL).

[0006] However, when the UL TCI state is introduced, there is still no study on how to control the TCI state including the existing TCI state (TCI state for the downlink (DL)). If this control is not clarified, there is a risk that the increase in communication throughput will be suppressed.

[0007] Therefore, the present disclosure provides a terminal and a wireless communication method capable of appropriately controlling the TCI state. 、 base station and systems One of the aims is to provide. [Means for solving the problem]

[0008] A terminal according to an embodiment of the present disclosure is capable of setting a transmission configuration indication state (TCI state) that can be used both as a downlink (DL) transmission configuration indication state and as an uplink (UL) TCI state. 1. A receiving unit for receiving Radio Resource Control (RRC) parameters; 1.A medium access control element (MAC Control Element (MAC CE)) that determines whether an RRC parameter is associated with a set of TCI states common to both DL and UL or associated with a set of TCI states for DL, and activates one or more TCI states of the set of TCI states common to both DL and UL or one or more TCI states of the set of TCI states for DL, and downlink control information (Downlink Control Information (DCI)) that indicates at least one TCI state, and and signal At least one of a control unit for determining a TCI state to be applied to the and the MAC CE includes a field indicating whether a second activated TCI state exists, the field being mapped to one code point of the DCI field, and when the first RRC parameters are associated with a set of TCI states for DL, the receiving unit receives second RRC parameters associated with a set of TCI states for UL. do. Effect of the Invention

[0009] According to one aspect of the present disclosure, the TCI state can be appropriately controlled. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing an example of RRC configuration in the TCI state in embodiment 1.1. [Diagram 2] FIG. 2 is a diagram showing an example of RRC configuration in the TCI state in embodiment 1.2. [Diagram 3] FIG. 3 is a diagram showing another example of RRC setting in the TCI state in embodiment 1.2. [Figure 4] FIG. 4 is a diagram showing an example of RRC configuration in the TCI state in embodiment 1.3. [Diagram 5] FIG. 5 is a diagram showing an example of RRC configuration in the TCI state in embodiment 1.4. [Figure 6] FIG. 6 is a diagram showing another example of RRC setting in the TCI state in embodiment 1.4. [Figure 7] FIG. 7 is a diagram showing yet another example of RRC setting in the TCI state in embodiment 1.4. [Figure 8]FIG. 8 is a diagram showing an example of an RRC configuration of a set of TCI states in embodiment 2.1. [Figure 9] FIG. 9 is a diagram showing an example of RRC configuration of a set of TCI states in embodiment 2.2. [Figure 10] FIG. 10 is a diagram showing an example of RRC configuration of a set of TCI states in embodiment 2.3. [Figure 11] 11A and 11B are diagrams illustrating an example of a TCI state activation / deactivation MAC CE in the third embodiment. [Figure 12] FIG. 12 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 13] FIG. 13 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 14] FIG. 14 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 15] FIG. 15 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (TCI, spatial relations, QCL) In NR, it is considered that a UE will control reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) of at least one of a signal and a channel (which may be expressed as signal / channel. In this disclosure, "A / B" may similarly be read as "at least one of A and B") based on a transmission configuration indication state (TCI state).

[0012] The TCI state may represent a state that is applied to a downlink signal / channel. The equivalent of the TCI state that is applied to an uplink signal / channel may be expressed as a spatial relation.

[0013] The TCI state is information about the Quasi-Co-Location (QCL) of signals / channels, and may also be called spatial reception parameters, spatial relation information (SRI), etc. The TCI state may be configured in the UE for each channel or for each signal.

[0014] A QCL is an index that indicates the statistical properties of a signal / channel. For example, when a signal / channel and another signal / channel are in a QCL relationship, it may mean that it can be assumed that at least one of the following is the same (QCL with respect to at least one of the following) between these different signals / channels: Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter).

[0015] In addition, the spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be specified based on a spatial QCL. A QCL (or at least one element of a QCL) in the present disclosure may be replaced with a spatial QCL (sQCL).

[0016] A plurality of types (QCL types) of QCL may be defined. For example, four QCL types AD may be provided, each having different parameters (or parameter sets) that can be assumed to be the same. The parameters (which may be called QCL parameters) are as follows: QCL Type A: Doppler shift, Doppler spread, mean delay and delay spread, QCL type B: Doppler shift and Doppler spread, QCL Type C: Doppler shift and mean delay, · QCL Type D: Spatial reception parameters.

[0017] Types A to C may correspond to QCL information related to at least one of time and frequency synchronization processing, and type D may correspond to QCL information related to beam control.

[0018] The UE's assumption that a given Control Resource Set (CORESET), channel, or reference signal is in a particular QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be referred to as a QCL assumption.

[0019] The UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal / channel based on the TCI condition or QCL assumptions of the signal / channel.

[0020] The TCI state may be, for example, information about the QCL between a target channel (or a Reference Signal (RS) for the channel) and another signal (e.g., another Downlink Reference Signal (DL-RS)). The TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination of these.

[0021] In the present disclosure, higher layer signaling may be, for example, any one or a combination of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like.

[0022] The MAC signaling may be, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0023] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0024] In addition, the channel / signal to which the TCI state is applied may be referred to as a target channel / reference signal (target channel / RS) or simply as a target, and the other signal may be referred to as a reference reference signal (reference RS), source RS, or simply as a reference.

[0025] The channel for which the TCI state is set (specified) may be, for example, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), or the like.

[0026] Furthermore, the RS (DL-RS) that has a QCL relationship with the channel may be, for example, at least one of a Synchronization Signal Block (SSB) and a Channel State Information Reference Signal (CSI-RS). Alternatively, the DL-RS may be a CSI-RS (also called a Tracking Reference Signal (TRS)) used for tracking, or a reference signal (also called a QRS) used for QCL detection.

[0027] An SSB is a signal block including at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). An SSB may be referred to as an SS / PBCH block.

[0028] A TCI state information element ("TCI-state IE" in RRC) set by higher layer signaling may include one or more pieces of QCL information ("QCL-Info"). The QCL information may include at least one of information on a DL-RS having a QCL relationship (DL-RS relationship information) and information indicating a QCL type (QCL type information). The DL-RS relationship information may include information such as an index of the DL-RS (e.g., an SSB index, a Non-Zero-Power (NZP) CSI-RS resource Identifier), an index of a cell in which the RS is located, and an index of a Bandwidth Part (BWP) in which the RS is located.

[0029] (Spatial Relationships for SRS, PUSCH) In Rel.15 NR, a UE may receive information (SRS configuration information, for example, parameters in the RRC control element "SRS-Config") used to transmit a measurement reference signal (e.g., a Sounding Reference Signal (SRS)).

[0030] Specifically, the UE may receive at least one of information regarding one or more SRS resource sets (SRS resource set information, e.g., the RRC control element "SRS-ResourceSet") and information regarding one or more SRS resources (SRS resource information, e.g., the RRC control element "SRS-Resource").

[0031] An SRS resource set may be associated with (group together) a number of SRS resources, each of which may be identified by an SRS Resource Indicator (SRI) or SRS Resource Identifier (ID).

[0032] The SRS resource set information may include an SRS resource set ID (SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, an SRS resource type, and information on SRS usage.

[0033] Here, the SRS resource type may indicate any one of periodic SRS (P-SRS), semi-persistent SRS (SP-SRS), and aperiodic SRS (A-SRS). Note that the UE may transmit the P-SRS and SP-SRS periodically (or periodically after activation) and transmit the A-SRS based on an SRS request of the DCI.

[0034] Furthermore, the use (RRC parameter "usage" and L1 (Layer-1) parameter "SRS-SetUse") may be, for example, beam management, codebook (CB), noncodebook (NCB), antenna switching, etc. The SRS for codebook or noncodebook use may be used to determine a precoder for codebook-based or noncodebook-based uplink shared channel (Physical Uplink Shared Channel (PUSCH)) transmission based on the SRI.

[0035] For example, the UE may determine a precoder for PUSCH transmission based on the SRI, a Transmitted Rank Indicator (TRI), and a Transmitted Precoding Matrix Indicator (TPMI) in the case of codebook-based transmission. The UE may determine a precoder for PUSCH transmission based on the SRI in the case of non-codebook-based transmission.

[0036] The SRS resource information may include an SRS resource ID (SRS-ResourceId), an SRS port number, an SRS port number, a transmission Comb, an SRS resource mapping (e.g., time and / or frequency resource position, resource offset, resource period, repetition number, SRS symbol number, SRS bandwidth, etc.), hopping related information, an SRS resource type, a sequence ID, spatial relationship information of the SRS, etc.

[0037] The spatial relationship information of the SRS (e.g., the RRC information element "spatialRelationInfo") may indicate spatial relationship information between a certain reference signal and the SRS. The certain reference signal may be at least one of a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Channel State Information Reference Signal (CSI-RS), and an SRS (e.g., another SRS). The SS / PBCH block may be referred to as a Synchronization Signal Block (SSB).

[0038] The spatial relationship information of the SRS may include at least one of an SSB index, a CSI-RS resource ID, and an SRS resource ID as an index of the predetermined reference signal.

[0039] In the present disclosure, the SSB index, the SSB resource ID, and the SSB Resource Indicator (SSBRI) may be interchangeable. Also, the CSI-RS index, the CSI-RS resource ID, and the CSI-RS Resource Indicator (CRI) may be interchangeable. Also, the SRS index, the SRS resource ID, and the SRI may be interchangeable.

[0040] The spatial relationship information of the SRS may include a serving cell index, a BWP index (BWP ID), etc., corresponding to the above-mentioned predetermined reference signal.

[0041] When the UE is configured with spatial relationship information regarding the SSB or CSI-RS and the SRS for a certain SRS resource, the UE may transmit the SRS resource using the same spatial domain filter (spatial domain transmit filter) as the spatial domain filter (spatial domain receive filter) for receiving the SSB or CSI-RS. In this case, the UE may assume that the UE receive beam for the SSB or CSI-RS and the UE transmit beam for the SRS are the same.

[0042] When the UE is configured with spatial relationship information regarding a certain SRS (target SRS) resource between another SRS (reference SRS) and the SRS (target SRS), the UE may transmit the target SRS resource using the same spatial domain filter (spatial domain transmit filter) as the spatial domain filter (spatial domain transmit filter) for transmitting the reference SRS. That is, in this case, the UE may assume that the UE transmit beam of the reference SRS and the UE transmit beam of the target SRS are the same.

[0043] The UE may determine the spatial relationship of the PUSCH scheduled by the DCI (e.g., DCI format 0_1) based on a value of a predetermined field (e.g., an SRS resource identifier (SRI) field) in the DCI. Specifically, the UE may use spatial relationship information of the SRS resource (e.g., the RRC information element "spatialRelationInfo") determined based on the value of the predetermined field (e.g., the SRI) for PUSCH transmission.

[0044] In Rel.15 / 16 NR, when using codebook-based transmission for PUSCH, the UE may be configured by RRC with a codebook-used SRS resource set having up to two SRS resources, and one of the up to two SRS resources may be indicated by DCI (1-bit SRI field). The transmit beam for PUSCH will be specified by the SRI field.

[0045] The UE may determine the TPMI and the number of layers (transmission rank) for the PUSCH based on the precoding information and number of layers field (hereinafter also referred to as the precoding information field). The UE may select a precoder based on the TPMI, the number of layers, etc. from an uplink codebook for the same number of ports as the number of SRS ports indicated by the higher layer parameter "nrofSRS-Ports" configured for the SRS resource specified by the SRI field.

[0046] In Rel.15 / 16 NR, when non-codebook-based transmission is used for PUSCH, a non-codebook-used SRS resource set having up to four SRS resources may be configured for the UE by RRC, and one or more of the up to four SRS resources may be indicated by DCI (a 2-bit SRI field).

[0047] The UE may determine the number of layers (transmission rank) for the PUSCH based on the SRI field. For example, the UE may determine that the number of SRS resources specified by the SRI field is the same as the number of layers for the PUSCH. The UE may also calculate a precoder for the SRS resources.

[0048] If a CSI-RS (which may be called associated CSI-RS) associated with the SRS resource (or an SRS resource set to which the SRS resource belongs) is configured by a higher layer, the transmission beam of the PUSCH may be calculated based on (measurement of) the configured associated CSI-RS. Otherwise, the transmission beam of the PUSCH may be specified by the SRI.

[0049] In addition, the UE may be configured to use codebook-based PUSCH transmission or non-codebook-based PUSCH transmission by a higher layer parameter "txConfig" indicating a transmission scheme. The parameter may indicate a value of "codebook" or "non-codebook".

[0050] In this disclosure, the codebook-based PUSCH (codebook-based PUSCH transmission, codebook-based transmission) may refer to the PUSCH when the UE is configured with "codebook" as the transmission scheme. In this disclosure, the non-codebook-based PUSCH (non-codebook-based PUSCH transmission, non-codebook-based transmission) may refer to the PUSCH when the UE is configured with "non-codebook" as the transmission scheme.

[0051] (UL TCI status) In NR, the use of the UL TCI state as a beam indication method for UL is being considered. The UL TCI state is similar to the notification of the DL beam (DL TCI state) of the UE. Note that the DL TCI state may be read as the TCI state for PDCCH / PDSCH and vice versa.

[0052] The UL TCI state may be configured in the UE by spatial relation information defined in a particular release (e.g., spatialRelationInfo-r17 defined in Rel.17) (which may also be referred to as UL TCI state information). The UL TCI state may also be referred to as a unified TCI state (U-TCI state), a spatial relation, a spatial relation of a particular release, etc.

[0053] One or more of the configured UL TCI states may be activated / deactivated using the MAC CE, and spatial relationship information for at least one of the A-SRS, PUSCH, PUCCH, and PRACH from the configured / activated UL TCI states may be specified to the UE by the DCI.

[0054] The channel / signal (which may be referred to as a target channel / RS) for which the UL TCI state is set (specified) may be, for example, at least one of a PUSCH, a Demodulation Reference Signal (DMRS) for PUSCH, a PUCCH, a DMRS for PUCCH, a Physical Random Access Channel (PRACH), an SRS, etc.

[0055] Furthermore, the RS (reference RS) that has a QCL relationship with the channel / signal may be, for example, a DL RS (e.g., SSB, CSI-RS, TRS, etc.) or a UL RS (e.g., SRS, SRS for beam management, etc.).

[0056] In the UL TCI state, an RS that has a QCL relationship with the channel / signal may be associated with a panel (panel ID) for receiving or transmitting the RS. The association may be explicitly configured (or specified) or implicitly determined by higher layer signaling (e.g., RRC signaling, MAC CE, etc.).

[0057] The correspondence between the RS and the panel ID may be set by being included in the UL TCI state information, or may be set by being included in at least one of the resource setting information, spatial relationship information, and the like of the RS.

[0058] The QCL type indicated by the UL TCI state may be the existing QCL type AD or may be another QCL type, and may include a predefined spatial relationship, associated antenna ports (port index), etc.

[0059] When a UE is assigned an associated panel ID for a UL transmission (e.g., assigned by DCI), the UE may perform the UL transmission using a panel corresponding to the panel ID. The panel ID may be associated with a UL TCI state, and when a UE is assigned (or activated) a UL TCI state for a given UL channel / signal, the UE may identify the panel to use for the UL channel / signal transmission according to the panel ID associated with the UL TCI state.

[0060] However, when the UL TCI state is introduced, there is still no study on how to control the TCI state including the existing TCI state (TCI state for downlink (DL)). If this control is not clarified, there is a risk that the increase in communication throughput will be suppressed.

[0061] Therefore, the present inventors have devised a method for appropriately controlling the TCI state. For example, in one aspect of the present disclosure, a specific configuration of RRC signaling, MAC CE, etc. for setting / activating the TCI state is presented.

[0062] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The wireless communication methods according to the embodiments may be applied independently or in combination. The embodiments of the present disclosure may be used when the UL TCI state is not introduced.

[0063] In the present disclosure, "A / B" may mean "at least one of A and B."

[0064] In the present disclosure, the terms activate, deactivate, indicate, select, configure, update, determine, etc. may be read as interchangeable terms.

[0065] In the present disclosure, panel, beam, panel group, beam group, Uplink (UL) transmitting entity, TRP, spatial relationship information (SRI), spatial relationship, control resource set (CORESET), Physical Downlink Shared Channel (PDSCH), codeword, base station, a specific antenna port (e.g., a DeModulation Reference Signal (DMRS) port), a specific antenna port group (e.g., a DMRS port group), a specific group (e.g., a Code Division Multiplexing (CDM) group, a specific reference signal group, a CORESET group), a specific resource (e.g., a specific reference signal resource), a specific resource set (e.g., a specific reference signal resource set), a CORESET pool, a PUCCH group (PUCCH resource group), a spatial relationship group, a downlink TCI state (DL TCI state), an uplink TCI state (UL TCI state), a unified TCI state, a QCL, and the like may be read as interchangeable.

[0066] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interchangeable. The "spatial relationship information" may be interchangeable with "set of spatial relationship information", "one or more pieces of spatial relationship information", etc. The TCI state and the TCI may be interchangeable with each other.

[0067] In the present disclosure, the terms index, ID, indicator, and resource ID may be interchangeable. Also, in the present disclosure, the terms sequence, list, set, group, cluster, and subset may be interchangeable.

[0068] In the following embodiments, spatial relationship information (spatialRelationInfo), spatial relationship information defined in a particular release (e.g., spatialRelationInfo-r17 defined in Rel.17), TCI state defined in a particular release (e.g., TCI-state-r17 defined in Rel.17), etc. may be read as interchangeable.

[0069] In the following embodiments, the spatial relationship information ID (spatialRelationInfoId), the spatial relationship information ID defined in a specific release (e.g., spatialRelationInfoId-r17 defined in Rel.17), the TCI state ID defined in a specific release (e.g., TCIstateId-r17 defined in Rel.17), etc. may be read as interchangeable. Note that the names of these parameters are not limited to these.

[0070] In the description of the following embodiments, terms such as "Spatial Relation Information (SRI)", "spatial relationship information for PUSCH", "spatial relationship", "UL beam", "UE transmit beam", "UL TCI", "UL TCI state", "spatial relationship of UL TCI state", SRS Resource Indicator (SRI), SRS resource, precoder, etc. may be interchangeable.

[0071] (Wireless communication method) <First embodiment> The first embodiment relates to an RRC setting of a TCI state that can be commonly used for DL ​​and UL. The first embodiment is broadly divided into embodiments 1.1 to 1.4, each of which will be described below.

[0072] [Embodiment 1.1] In the TCI state of embodiment 1.1, a downlink RS (DL RS) (eg, CSI-RS / SSB) can be set as the reference RS, and QCL type A / B / C / D can be set as the QCL type.

[0073] 1 is a diagram showing an example of RRC configuration of the TCI state in embodiment 1.1. This example is described using Abstract Syntax Notation One (ASN.1) notation (note that this is merely an example and may not be a complete description). The following drawings may also use ASN.1 notation.

[0074] In the present disclosure, the names of RRC information elements, RRC parameters, etc. may be given a suffix (e.g., "_r16", "_r17", "-r16", "-r17", etc.) indicating that they are introduced in a specific resource. The suffix may not be given.

[0075] TCI-state, which is an RRC information element of the TCI state, may include TCI-StateId indicating a TCI state ID and QCL-Info which is one or more pieces of QCL information.

[0076] The QCL information may include information such as ServCellIndex, which is an index of a cell in which a reference RS is transmitted (located), and BWP-Id, which is an index of a BWP in which the reference RS is transmitted. Note that, when a CSI-RS (or SSB) is indicated as a reference RS, the BWP-Id may be indicated by a parameter bwp-Id indicating an index of a DL BWP in which the reference RS is transmitted.

[0077] The QCL information may include a parameter referenceSignal (which may be referred to as reference RS information) indicating a reference RS. The reference RS information may include an index of a DL RS (e.g., an NZP CSI-RS resource ID (NZP-CSI-RS-ResourceId), an SSB index (SSB-Index)).

[0078] The QCL information may include a QCL type parameter (qcl-Type) indicating one of the QCL types AD.

[0079] The TCI state of embodiment 1.1 may apply only to the DL (may be used only as the DL TCI state), may apply only to the UL (may be used only as the UL TCI state), or may apply to both the DL and UL.

[0080] In this disclosure, a TCI state that applies only to DL may mean that only DL channels / signals can refer to (or be associated with) this TCI state. In this disclosure, a TCI state that applies only to UL may mean that only UL channels / signals can refer to (or be associated with) this TCI state. In this disclosure, a TCI state that applies to both DL and UL may mean that both DL and UL channels / signals can refer to (or be associated with) this TCI state.

[0081] In addition, in the present disclosure, "a certain TCI state is applied to DL" may be read as "the target channel / signal of a certain TCI state is a DL channel / signal," "a certain TCI state is used as a DL TCI state," and the like.

[0082] In the present disclosure, the DL channel / signal to which the TCI state applies may be, for example, PDSCH, PDCCH (CORESET), CSI-RS, SSB, DMRS, etc.

[0083] In addition, in the present disclosure, "a certain TCI state is applied to the UL" may be read as "the target channel / signal of a certain TCI state is a UL channel / signal" or "a certain TCI state is used as a UL TCI state", etc.

[0084] In this disclosure, the DL channel / signal to which the TCI state applies may be, for example, PUSCH, PUCCH, SRS, DMRS, and so on.

[0085] [Embodiment 1.2] In the TCI state of embodiment 1.2, at least one of DL RS (e.g., CSI-RS / SSB) and uplink RS (UL RS) (e.g., SRS) can be set as the reference RS, and QCL type A / B / C / D can be set as the QCL type.

[0086] Fig. 2 is a diagram showing an example of RRC configuration in a TCI state in embodiment 1.2. Hereinafter, differences between Fig. 2 and Fig. 1 will be described, and description of the same points will not be repeated.

[0087] The RRC information element TCI state, TCI-state-r17, may include one or more pieces of QCL information, QCL-Info-r17.

[0088] 2 may include an index of a UL RS (e.g., an SRS resource ID (SRS-ResourceId)) as reference RS information. When an SRS is indicated as the reference RS, the QCL information may include a parameter uplinkBWP indicating an index of a UL BWP in which the reference RS is transmitted.

[0089] When the TCI state of embodiment 1.2 is used as the DL TCI state and the SRS is configured as the reference RS, it may be assumed that only QCL type D is configured as the QCL type parameter. In this case, QCL type D may be interpreted as the spatial domain filter for DL ​​reception being the same as the spatial domain filter for UL transmission (in other words, the same spatial transmit / receive parameters are applied between the two UL / DL antenna ports (or UL / DL RSs)).

[0090] The existing QCL type D in Rel.15 / 16 meant that the spatial reception parameters are the same between the two DL antenna ports (or DL ​​RS). By using the above interpretation, it is possible to use a unified QCL type for DL ​​and UL without specifying a new QCL type.

[0091] Also, when the TCI state of embodiment 1.2 is used as the UL TCI state and SRS / CSI-RS / SSB is configured as the reference RS, it may be assumed that only QCL type D is configured as the QCL type parameter. In this case, QCL type D may be interpreted as the spatial domain filter for UL transmission being the same as the spatial domain filter for UL transmission / DL reception (in other words, the same spatial transmission / reception parameters are applied between two UL / DL antenna ports (or UL / DL RSs)).

[0092] Fig. 3 is a diagram showing another example of RRC configuration in the TCI state in embodiment 1.2. Hereinafter, differences between Fig. 3 and Fig. 2 will be described, and description of the same points will not be repeated.

[0093] The QCL type parameter (qcl-Type-r17) in Figure 3 may indicate at least one of the new QCL types (referred to in this disclosure as QCL types X, Y, Z, etc.) in addition to or instead of at least one of the QCL types AD. In Figure 3, the value of the QCL type parameter can take on QCL types A, B, C, D, or X.

[0094] QCL type X may indicate that when the TCI state is used as the DL TCI state and when the SRS is configured as the reference RS, the spatial domain filter for DL ​​reception is the same as the spatial domain filter for UL transmission.

[0095] QCL type Y may indicate that when the TCI state is used as the UL TCI state and when the SRS is configured as the reference RS, the spatial domain filter for UL transmission is the same as the spatial domain filter for UL transmission.

[0096] QCL type Z may indicate that when the TCI state is used as the UL TCI state and CSI-RS / SSB is configured as the reference RS, the spatial domain filter for UL transmission is the same as the spatial domain filter for DL ​​reception.

[0097] It should be noted that a common QCL type may be defined that can mean multiple (e.g., all) of these QCL types X, Y, and Z. For example, a common QCL type (which may be called, for example, QCL type XY) may be defined that is interpreted as QCL type X when a TCI state is used as a DL TCI state and as QCL type Y when the TCI state is used as a UL TCI state, and set to qcl-Type-r17.

[0098] The TCI state of embodiment 1.2 may apply only to the DL, only to the UL, or to both the DL and UL.

[0099] [Embodiment 1.3] In the TCI state of embodiment 1.3, at least one of DL RS (eg, CSI-RS / SSB) and UL RS (eg, SRS) can be set as the reference RS, but the QCL type is not set.

[0100] Fig. 4 is a diagram showing an example of RRC setting in the TCI state in embodiment 1.3. Hereinafter, differences between Fig. 4 and Fig. 2 will be described, and description of the same points will not be repeated.

[0101] TCI-state-r17, which is the RRC information element for the TCI state in Figure 4, does not include QCL-Info-r17 indicating the QCL information in Figure 2 (indicated by the RRC parameters qcl-Type1 / 2 which include information on the QCL type), but has a configuration which directly includes RRC parameters other than the QCL type parameters (qcl-Type / qcl-Type-r17) of QCL-Info-r17.

[0102] Note that when the reference RS is a DL RS, the name of the parameter bwp-Id indicating the index of the DL BWP is changed to downlinkBWP, but the parameter name is not limited to this (note that in this disclosure, these names may be read as interchangeable).

[0103] The QCL type of the TCI state in embodiment 1.3 is not explicitly set, but may be implicitly determined (derived) from other parameters. For example, when this TCI state is used as a DL TCI state and an SRS is set as a reference RS, the QCL type of the TCI state may be determined to be QCL type X described in embodiment 1.2. QCL types Y, Z, etc. may also be determined based on the description of embodiment 1.2.

[0104] According to the RRC setting of the TCI state in embodiment 1.3, the QCL type parameter is not explicitly included, thereby making it possible to suppress an increase in communication overhead for setting the TCI state.

[0105] The TCI state of embodiment 1.3 may apply only to the DL, only to the UL, or to both the DL and UL.

[0106] [Embodiment 1.4] The TCI status of embodiment 1.4 includes both QCL information for DL ​​and QCL information for UL.

[0107] Fig. 5 is a diagram showing an example of RRC setting in the TCI state in embodiment 1.4. Below, differences between Fig. 5 and the previous figures will be described, and description of the same points will not be repeated.

[0108] TCI-state-r17, which is an RRC information element of the TCI state in Fig. 5, includes QCL-Info (indicated by RRC parameters qcl-Type1 / 2 including information on the QCL type) indicating QCL information for DL ​​and QCL-UL indicating QCL information for UL. In this way, the QCL information in embodiment 1.4 may be represented by different RRC parameters for DL ​​and UL.

[0109] This QCL-Info may be the same as the QCL-Info in Fig. 1. Also, the content of this QCL-UL may be, for example, the QCL type parameter (qcl-Type / qcl-Type-r17) removed from QCL-Info-r17 in Fig. 2. The QCL type related to the QCL information for the UL in embodiment 1.4 may be determined implicitly as in embodiment 1.3.

[0110] Fig. 6 is a diagram showing another example of RRC setting in the TCI state in embodiment 1.4. Hereinafter, differences between Fig. 6 and Fig. 5 will be described, and description of the same points will not be repeated.

[0111] TCI-state-r17, which is an RRC information element of the TCI state in Fig. 6, includes, as the QCL information for DL, not QCL-Info but QCL-Info-r17 in Fig. 2. Note that QCL-Info-r17 may be QCL-Info-r17 in Fig. 3.

[0112] Fig. 7 is a diagram showing yet another example of RRC setting in the TCI state in embodiment 1.4. Below, differences between Fig. 7 and Fig. 5 will be described, and description of the same points will not be repeated.

[0113] TCI-state-r17, which is an RRC information element of the TCI state in Fig. 7, uses QCL-Info-r17 in Fig. 3 for both the QCL information for DL ​​and the QCL information for UL. When SRS is set as the reference RS for DL ​​or CSI-RS / SSB / SRS is set as the reference RS for UL, QCL type D or the above-mentioned new QCL type may be set as the QCL type.

[0114] The TCI state of embodiment 1.4 may be applied to both DL and UL.

[0115] According to the first embodiment described above, the RRC setting in the TCI state can be appropriately configured.

[0116] <Second embodiment> The second embodiment relates to an RRC configuration for a set of one or more TCI states in at least one of DL and UL. The second embodiment is broadly divided into embodiments 2.1 to 2.4, each of which will be described below.

[0117] [Embodiment 2.1] The set of TCI states in embodiment 2.1 corresponds to a common set for both DL and UL. The set includes one or more TCI states. Each TCI state in the set applies to both DL and UL (i.e., each TCI state may be used as a DL TCI state or a UL TCI state).

[0118] FIG. 8 is a diagram showing an example of an RRC configuration of a set of TCI states in embodiment 2.1.

[0119] In Fig. 8, Unified-TCI-State-Config, which is an RRC information element for configuring a unified TCI state, may include an RRC parameter tci-StatesToAddModList, which is a list of 1 to maxNrofTCI-States unified TCI states (e.g., TCI-State-r17, TCI-State, etc., as described in the first embodiment). tci-StatesToRelease may be used to release a TCI state from the list.

[0120] In addition, maxNrofTCI-States may represent the maximum number of unified TCI states that can be configured for a UE, and may be specified in advance by a specification, may be set by higher layer signaling, or may be determined based on UE capabilities.

[0121] The UE may apply the TCI state configured by Unified-TCI-State-Config as at least one of a DL TCI state and a UL TCI state.

[0122] [Embodiment 2.2] The set of TCI states in embodiment 2.2 corresponds to a common set for both DL and UL. The set includes one or more TCI states. The difference between embodiment 2.2 and embodiment 2.1 is that a subset of UL TCI states (subset for UL) and a subset of DL TCI states (subset for DL) are further selected from the TCI states included in the common set.

[0123] These subsets may be configured by the RRC, activated by the MAC CE, or specified by the DCI.

[0124] Fig. 9 is a diagram showing an example of RRC configuration of a set of TCI states in embodiment 2.2. This example corresponds to a case where a common set of TCI states is configured by RRC, and a subset of UL TCI states and a subset of DL TCI states are further configured by RRC from the common set. Unified-TCI-State-Config is the same as in Fig. 8, and therefore description thereof will not be repeated.

[0125] 9, UL-TCI-State-Config, which is an RRC information element for configuration of UL TCI states, may include an RRC parameter UL-tci-StatesToAddModList, which is a list of 1 to maxNrofULTCI-States TCI state IDs (which may be expressed as TCI-State-r17 IDs (TCI-StateId, TCI-State-ID-r17, etc.)). UL-tci-StatesToRelease may be used to release a TCI state from the list.

[0126] Note that maxNrofULTCI-States may represent the maximum number of UL TCI states that can be set in a UE, and may be specified in advance by a specification, may be set by higher layer signaling, or may be determined based on UE capabilities.

[0127] 9, DL-TCI-State-Config, which is an RRC information element for configuration of DL TCI states, may include an RRC parameter DL-tci-StatesToAddModList, which is a list of 1 to maxNrofDLTCI-States TCI state IDs (which may be expressed as TCI-State-r17 IDs (TCI-StateId, TCI-State-ID-r17, etc.)). DL-tci-StatesToRelease may be used to release a TCI state from the list.

[0128] Note that maxNrofDLTCI-States may represent the maximum number of DL TCI states that can be set for a UE, and may be specified in advance by a specification, may be set by higher layer signaling, or may be determined based on UE capabilities.

[0129] In the present disclosure, maxNrofULTCI-States, maxNrofDLTCI-States, etc. may be the same value and may be replaced with maxNrofTCI-States.

[0130] In this way, a certain TCI state (TCI-State-r17) may mean a UL TCI state when it is set in association with a UL TCI state (e.g., included in UL-TCI-State-Config), and may mean a DL TCI state when it is set in association with a DL TCI state (e.g., included in DL-TCI-State-Config).

[0131] The UE may assume that a TCI state is associated with only one of a DL TCI state and a UL TCI state, or may assume that a TCI state may be associated with both a DL TCI state and a UL TCI state.

[0132] Take for example a case where a total of eight TCI states, TCI state IDs 1 to 8, are set in the common set. In the former case, for example, TCI state IDs 1-4 are associated with UL TCI states, and TCI state IDs 5-8 are associated with DL TCI states. In the latter case, for example, TCI state IDs 1-4 are associated with UL TCI states, and TCI state IDs 3-6 are associated with DL TCI states (TCI state IDs 3-4 are associated with both DL and UL).

[0133] In the above, an example has been shown in which a subset of a UL TCI state and a subset of a DL TCI state are selected from a common set, but this is not limiting. For example, when one set (e.g., unified-TCI-State-Config) is set as a set for one of a UL TCI state and a DL TCI state, a subset for the other of a UL TCI state and a DL TCI state may be selected from the set. When unified-TCI-State-Config indicates a set of DL TCI states, it is sufficient that UL-TCI-State-Config for the UL TCI state is set, and it is not necessary to set DL-TCI-State-Config for the DL TCI state separately.

[0134] The UE may determine that a first range of TCI states in the common set indicates DL TCI states and a second range of TCI states indicates UL TCI states. For example, the UE may determine that 0 to X-th entries in the list of the common set (UL-tci-StatesToAddModList) indicate DL and X+1 to Y-th entries indicate UL. The UE may determine that 0 to X-th entries in the list of the common set (UL-tci-StatesToAddModList) indicate DL and 0 to Y-th entries indicate UL. In this way, the first range and the second range may overlap (in the case of overlap, they are used as both DL TCI states and UL TCI states).

[0135] Note that the "i-th entry" here may be interpreted as the i-th TCI state, starting from the TCI state with the smallest (or largest) TCI state ID, among the TCI states included in the common set.

[0136] The above first range, second range, etc. (e.g., the value of X, the value of Y, and the start position of the range (0, X+1, etc. in the above example)) may be specified in advance by a specification, may be set by higher layer signaling, or may be determined based on UE capabilities.

[0137] The UE may apply the TCI state associated with the configured UL-TCI-State-Config as the UL TCI state. The UE may apply the TCI state associated with the configured DL-TCI-State-Config as the DL TCI state.

[0138] [Embodiment 2.3] The set of TCI states in embodiment 2.3 corresponds to a separate set for DL ​​and a separate set for UL. These sets include one or more TCI states. In embodiment 2.3, no common set is configured.

[0139] Fig. 10 is a diagram showing an example of an RRC configuration of a set of TCI states in embodiment 2.3. Fig. 10 shows UL-TCI-State-Config, which is an RRC information element for the configuration for the UL TCI state, similar to Fig. 9, and DL-TCI-State-Config, which is an RRC information element for the configuration for the DL TCI state. Unlike Fig. 9, UL-tci-StatesToAddModList of UL-TCI-State-Config is a list of RRC information elements UL-TCI-State-r17 dedicated to the UL TCI state, and DL-tci-StatesToAddModList of DL-TCI-State-Config is a list of RRC information elements DL-TCI-State-r17 dedicated to the DL TCI state.

[0140] The actual state of UL-TCI-State-r17 and DL-TCI-State-r17 may correspond to TCI-State-r17 and TCI-State as described in the first embodiment. UL-TCI-State-r17 and DL-TCI-State-r17 are independent, and indicate different TCI states even if the TCI state ID is the same, for example.

[0141] The UE may apply the TCI state associated with the configured UL-TCI-State-Config as the UL TCI state. The UE may apply the TCI state associated with the configured DL-TCI-State-Config as the DL TCI state.

[0142] [Embodiment 2.4] Embodiment 2.4 corresponds to a combination of multiple embodiments 2.1 to 2.3.

[0143] For example, consider a combination of embodiments 2.1 and 2.2. If the UE is not configured with a configuration for the UL TCI / DL TCI state (e.g., UL-TCI-State-Config / DL-TCI-State-Config), the UE may apply a common TCI state configuration (e.g., Unified-TCI-State-Config) to both UL and DL based on embodiment 2.1, and if not (the UE is configured with a configuration for the UL TCI / DL TCI state), the UE may apply a configuration for the UL TCI / DL TCI state to UL / DL based on embodiment 2.2.

[0144] For example, consider a combination of embodiments 2.1 and 2.3. If the UE is not configured with a configuration for the UL TCI / DL TCI state (e.g., UL-TCI-State-Config / DL-TCI-State-Config), the UE may apply a common TCI state configuration (e.g., Unified-TCI-State-Config) to both UL and DL based on embodiment 2.1, and if not (the UE is configured with a configuration for the UL TCI / DL TCI state), the UE may apply a configuration for the UL TCI / DL TCI state to UL / DL based on embodiment 2.3.

[0145] According to the second embodiment described above, for example, RRC setting for DL ​​TCI state / UL TCI state can be appropriately configured.

[0146] <Third embodiment> The third embodiment relates to a MAC CE activating a TCI state.

[0147] The MAC CE may activate the TCI states for both DL and UL, or may activate the TCI states for DL ​​and TCI states for UL separately.

[0148] 11A and 11B are diagrams illustrating an example of a TCI state activation / deactivation MAC CE in the third embodiment, which may be used to activate / deactivate a TCI state for a specific channel / signal (e.g., PDSCH, PUSCH, PDCCH, PUCCH, SRS, CSI-RS, etc.).

[0149] The MAC CE in FIG. 11A includes a CORESET pool ID field, a serving cell ID field, a BWP ID field, and a T i The R field is a reserved field that is to be used in the future.

[0150] The serving cell ID field and the BWP ID field indicate the serving cell and the BWP to which the MAC CE applies.

[0151] T i The field may, when set to 1, indicate that the TCI state with TCI state ID i (or the TCI state with the i-th lowest or highest TCI state ID among the configured TCI states / DL TCI states / UL TCI states) is activated and is mapped to a code point in the TCI field of the DCI. i It may be determined by its ordinal position among all TCI states that carry the field.

[0152] The CORESET pool ID field indicates the activated TCI state and the iThe mapping between the code point of the TCI field of the DCI set by the CORESET Pool ID may be specific to the CORESET in which the CORESET Pool ID is set. The CORESET Pool ID field may be omitted.

[0153] The MAC CE in FIG. 11B includes a serving cell ID field, a BWP ID field, and a C i Fields and TCI State IDs i,j Fields, including:

[0154] C i The field is the TCI state ID. i,2 Indicates whether the octet containing the field TCI Status ID is present. i,j The field may indicate the j-th activated TCI state, which is mapped to codepoint (i) of a DCI field (e.g., TCI field) that indicates the TCI state. The TCI codepoint to which the TCI state is mapped may be TCI state ID i,j It may be determined by its ordinal position among all the TCI codepoints that comprise the set of fields.

[0155] The UE may determine a TCI state to apply to a particular channel / signal (e.g., PDSCH, PUSCH, PDCCH, PUCCH, SRS, CSI-RS, etc.) based on at least one of a TCI state set by an RRC parameter described in the first and second embodiments, a TCI state activated by a MAC CE described in the third embodiment, a TCI state specified by a DCI from a set or activated TCI state, etc.

[0156] It should be noted that the MAC CE for activating the TCI state of the present disclosure is not limited to those shown in FIGS. 11A and 11B.

[0157] According to the third embodiment described above, for example, a MAC CE for activating the DL TCI state / UL TCI state can be appropriately configured.

[0158] <Other embodiments> In the present disclosure, the setting of the TCI state (set) described in the first and second embodiments, and the activation of the TCI state described in the third embodiment may be performed in at least one of the following units: All UL and DL channels / signals, All UL channels / signals, All DL channels / signals, Each channel / signal.

[0159] In other words, one RRC setting / one activation for the TCI state may apply across all channels / signals, only to the UL, only to the DL, or only to a specific channel / signal (e.g., PDSCH, PUSCH, PDCCH, PUCCH, SRS, CSI-RS, etc.).

[0160] (Wireless communication system) A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination of these methods.

[0161] 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 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), or the like, which are specified by the Third Generation Partnership Project (3GPP).

[0162] Furthermore, the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0163] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN) and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN and the LTE (E-UTRA) base station (eNB) is the SN.

[0164] The wireless communication system 1 may support dual connectivity between multiple base stations in the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0165] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged in the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1. A user terminal 20 may be located in at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as a base station 10.

[0166] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0167] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0168] Furthermore, the user terminal 20 may perform communication in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0169] The multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0170] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0171] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0172] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

[0173] The radio access scheme may be called a waveform. In the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0174] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as a downlink channel.

[0175] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0176] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0177] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information of at least one of the PDSCH and the PUSCH.

[0178] In addition, DCI for scheduling PDSCH may be called DL assignment, DL DCI, etc., and DCI for scheduling PUSCH may be called UL grant, UL DCI, etc. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

[0179] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or multiple search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0180] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in the present disclosure may be read as interchangeable terms.

[0181] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and a scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0182] In the present disclosure, a downlink, an uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning of the channels.

[0183] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0184] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) may be called an SS / PBCH block, an SS Block (SSB), or the like. In addition, the SS, SSB, and the like may also be called a reference signal.

[0185] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may be called a user equipment specific reference signal (UE-specific reference signal).

[0186] (base station) 13 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may be provided.

[0187] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0188] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0189] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission and reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0190] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0191] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0192] The transmitting / receiving antenna 130 can be composed of an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0193] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0194] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0195] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0196] The transceiver 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0197] The transceiver unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna .

[0198] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna .

[0199] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0200] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0201] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data) for the user terminal 20, control plane data, etc.

[0202] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0203] In addition, the transceiver 120 may transmit to the user terminal 20 Radio Resource Control (RRC) parameters of a Transmission Configuration Indication state (TCI state) that can be used both as a downlink (DL) transmission configuration indication state and as an uplink (UL) TCI state.

[0204] The control unit 110 may assume that the user terminal 20 determines (judges) that the RRC parameters can be used for at least one of the TCI state for DL ​​and the TCI state for UL based on which set of TCI states the RRC parameters are associated with (and uses them for beam control, etc.).

[0205] (User terminal) 14 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0206] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0207] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0208] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission / reception unit 220.

[0209] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting / receiving circuit, and the like, which are described based on common understanding in the technical field related to the present disclosure.

[0210] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0211] The transmitting / receiving antenna 230 can be composed of an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.

[0212] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0213] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0214] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0215] The transceiver 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0216] Whether or not to apply the DFT process may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver 220 (transmission processor 2211) may perform the DFT process as the transmission process to transmit the channel using a DFT-s-OFDM waveform, and may not perform the DFT process as the transmission process if transform precoding is enabled for the channel.

[0217] The transceiver unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna 230.

[0218] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna 230.

[0219] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0220] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0221] In addition, the transmitting section and the receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0222] In addition, the transceiver unit 220 may receive a Radio Resource Control (RRC) parameter of a TCI state (e.g., TCI-state-r17, which is an RRC information element of the TCI state) that can be used as a Transmission Configuration Indication state (TCI state) for a downlink (DL) (DL TCI state) and as a TCI state for an uplink (UL) (UL TCI state).

[0223] The control unit 210 may determine that the RRC parameters are available for at least one of the DL TCI state and the UL TCI state based on which set of TCI states the RRC parameters are associated with, where the "set" may correspond to at least one of the above-mentioned tci-StatesToAddModList(Unified-TCI-State-Config), UL-tci-StatesToAddModList(UL-TCI-State-Config), DL-tci-StatesToAddModList(DL-TCI-State-Config), etc.

[0224] The control unit 210 may determine that if the RRC parameters are associated with a first set (e.g., tci-StatesToAddModList) that is common to both DL and UL, the RRC parameters can be used for both the TCI state for DL ​​and the TCI state for UL.

[0225] The control unit 210 may determine that if the RRC parameters are associated with the first set and the RRC parameters are associated with a second set (e.g., UL-tci-StatesToAddModList) for one of DL and UL (e.g., UL), the RRC parameters are only available for the TCI state for one of DL and UL.

[0226] The control unit 210 may determine that if the RRC parameters are associated with the first set and the second set, and further associated with a third set for the other of DL and UL (e.g., DL-tci-StatesToAddModList), the RRC parameters can be used for both the TCI state for DL ​​and the TCI state for UL.

[0227] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0228] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission may be called a transmitting unit, a transmitter, and the like. In either case, as described above, the method of realization is not particularly limited.

[0229] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 15 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0230] In this disclosure, the terms "apparatus," "circuit," "device," "section," "unit," and the like can be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0231] For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processes may be performed by one processor, or the processes may be performed by two or more processors simultaneously, sequentially, or in other manners. Also, the processor 1001 may be implemented by one or more chips.

[0232] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading a specific software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communications via a communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0233] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0234] Moreover, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to the programs. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks may be realized in a similar manner.

[0235] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be called a register, a cache, a main memory (primary storage device), and the like. The memory 1002 can store a program (program code), a software module, and the like that is executable to implement a wireless communication method according to an embodiment of the present disclosure.

[0236] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0237] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0238] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0239] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0240] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0241] (Modification) In addition, the terms explained in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be read as mutually interchangeable. A signal may also be a message. A reference signal may also be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applied standard. A component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, etc.

[0242] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0243] Here, the numerology may be a communication parameter applied to at least one of the transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0244] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may also be a time unit based on numerology.

[0245] A slot may include multiple minislots. Each minislot may be composed of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0246] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. A different name may be used for the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be read as interchangeable with each other.

[0247] For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0248] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0249] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0250] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0251] A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0252] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0253] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0254] In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0255] In addition, one or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0256] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0257] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0258] The BWP may include a UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0259] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given channel / signal outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0260] The above-mentioned structures of radio frames, subframes, slots, minislots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

[0261] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0262] The names used for parameters and the like in this disclosure are not limiting in any way. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0263] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0264] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via a plurality of network nodes.

[0265] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0266] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0267] The physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. The MAC signaling may be notified, for example, by using a MAC Control Element (CE).

[0268] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0269] The determination may be made based on a value represented by a single bit (0 or 1), a Boolean value represented as true or false, or by comparing numerical values ​​(e.g., with a predetermined value).

[0270] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0271] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0272] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0273] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," and the like may be used interchangeably.

[0274] In this disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0275] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services in this coverage.

[0276] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0277] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0278] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0279] Furthermore, the base station in the present disclosure may be read as a user terminal. For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0280] Similarly, the user terminal in the present disclosure may be interpreted as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0281] In the present disclosure, an operation performed by a base station may be performed by its upper node in some cases. It is clear that in a network including one or more network nodes having base stations, various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0282] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to implementation. In addition, the processing procedures, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be reordered unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0283] Each aspect / embodiment described in the present disclosure may be implemented using any of a wide variety of standards, including Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems using 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other appropriate wireless communication methods, next-generation systems that are based on these, etc. Also, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0284] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0285] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0286] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, and the like.

[0287] A "determining" may also be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.

[0288] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. That is, "determination" may be considered to be "deciding" to perform some action.

[0289] Additionally, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," etc.

[0290] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0291] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, and the like, as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, and the like, as some non-limiting and non-exhaustive examples.

[0292] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0293] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0294] In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0295] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modified and altered forms without departing from the spirit and scope of the invention defined based on the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the invention according to the present disclosure.

Claims

1. a receiver for receiving a first Radio Resource Control (RRC) parameter of a Transmission Configuration Indication state (TCI state) usable as a Downlink (DL) TCI state and an Uplink (UL) TCI state; a control unit that determines whether the first RRC parameter is associated with a set of TCI states common to both DL and UL or a set of TCI states for DL, and activates one or more TCI states in the set of TCI states common to both DL and UL or one or more TCI states in the set of TCI states for DL, and determines a TCI state to apply to at least one of a specific channel and a signal based on Downlink Control Information (DCI) indicating at least one TCI state; The MAC CE includes a field indicating whether a second activated TCI state exists, the field being mapped to a code point of one of the fields of the DCI; A terminal, wherein the receiving unit receives second RRC parameters associated with a set of TCI states for an UL if the first RRC parameters are associated with a set of TCI states for the DL.

2. The terminal according to claim 1, wherein at least one of the specific channel and the signal includes a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a sounding reference signal (SRS) and a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)).

3. receiving a first Radio Resource Control (RRC) parameter for a Transmission Configuration Indication state (TCI state) usable both as a Downlink (DL) TCI state and as an Uplink (UL) TCI state; determining whether the first RRC parameter is associated with a set of TCI states common to both DL and UL or associated with a set of TCI states for DL, and determining a TCI state to apply to at least one of a particular channel and / or signal based on a Medium Access Control (MAC) control element (MAC CE) activating one or more TCI states of the set of TCI states common to both DL and UL or one or more TCI states of the set of TCI states for DL, and Downlink Control Information (DCI) indicating at least one TCI state; The MAC CE includes a field indicating whether a second activated TCI state exists, the field being mapped to a code point of one of the fields of the DCI; A wireless communication method for a terminal, further comprising the step of receiving, if the first RRC parameters are associated with a set of TCI states for DL, second RRC parameters associated with a set of TCI states for UL.

4. A transmitter that transmits a first Radio Resource Control (RRC) parameter of a TCI state that can be used as a Transmission Configuration Indication state (TCI state) for a downlink (DL) and as a TCI state for an uplink (UL) to a terminal; a control unit that assumes that the terminal determines whether the first RRC parameter is associated with a set of TCI states common to both DL and UL or associated with a set of TCI states for DL, and that the terminal determines a TCI state to be applied to at least one of a specific channel and signal based on a Medium Access Control control element (MAC Control Element (MAC CE)) that activates one or more TCI states in the set of TCI states common to both DL and UL or one or more TCI states in the set of TCI states for DL, and Downlink Control Information (DCI) that indicates at least one TCI state; The MAC CE includes a field indicating whether a second activated TCI state exists, the field being mapped to a code point of one of the fields of the DCI; A base station, wherein if the first RRC parameters are associated with a set of TCI states for the DL, the transmitter transmits, to the terminal, second RRC parameters associated with a set of TCI states for the UL.

5. A system having a terminal and a base station, The terminal includes a receiving unit that receives a first Radio Resource Control (RRC) parameter of a TCI state that can be used as a Transmission Configuration Indication state (TCI state) for a downlink (Downlink (DL)) and as a TCI state for an uplink (Uplink (UL)); a control unit that determines whether the first RRC parameter is associated with a set of TCI states common to both DL and UL or a set of TCI states for DL, and activates one or more TCI states in the set of TCI states common to both DL and UL or one or more TCI states in the set of TCI states for DL, and determines a TCI state to apply to at least one of a specific channel and a signal based on Downlink Control Information (DCI) indicating at least one TCI state; If the first RRC parameters are associated with a set of TCI states for the DL, the receiver receives second RRC parameters associated with a set of TCI states for the UL; The base station includes a transmitter that transmits the first RRC parameter to the terminal; a control unit that assumes that the terminal determines whether the first RRC parameter is associated with a set of TCI states common to both the DL and UL or is associated with a set of TCI states for the DL, and that the terminal determines the TCI state based on the MAC CE and the DCI; If the first RRC parameters are associated with a set of TCI states for the DL, the transmitter transmits the second RRC parameters to the terminal; The MAC CE includes a field indicating whether a second activated TCI state exists, the field being mapped to a code point of one of the fields of the DCI.

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