Terminal, wireless communication method, base station, and system

Abstract

A terminal according to an aspect of the present disclosure comprises: a reception unit that receives a medium access control-control element (MAC CE) indicating information related to a transmission configuration indication (TCI) state; and a control unit that, on the basis of whether or not the TCI state is associated with a particular synchronization signal block or with a particular TCI state, determines a timing at which the TCI state is to be applied to at least one of the reception and the transmission. According to an aspect of the present disclosure, the TCI state can be appropriately applied.

Description

Technical Field

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

Background Art

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) was standardized for the purpose of further high-speed data rates, low latency, etc. (Non-Patent Document 1). Also, for the purpose of further large capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9), LTE-Advanced (3GPP Rel. 10-14) was standardized.

[0003] Successor systems to LTE (for example, also referred to as 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.) are also being considered.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a future wireless communication system (e.g., NR), a user terminal (terminal, user terminal, User Equipment (UE)) is considered to control transmission and reception processing based on information regarding Quasi-Co-Location (QCL) (QCL assumption / Transmission Configuration Indication (TCI) state / spatial relationship).

[0006] Furthermore, it is considered to reduce the delay time required for switching / activation of the TCI state.

[0007] However, the study of methods for reducing the delay time is not sufficient. If this study is not sufficient, there is a risk of causing a decrease in communication quality, a decrease in throughput, etc.

[0008] Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately apply the TCI state.

Means for Solving the Problems

[0009] A terminal according to an aspect of the present disclosure Transmission Configuration Indication has a receiving unit that receives a (MAC CE) indicating information regarding a (TCI) state, Medium Access Control-Control Element and a control unit that determines a timing for applying the TCI state to at least one of reception and transmission. When the Quasi-Co-Location (QCL) type D reference signal in the TCI state is a specific Synchronization Signal Block (SSB), in the first time from the reception of the MAC CE to the application of the TCI state, the second time for the reception of the SSB is not included wherein the TCI state is determined from a common TCI state for a plurality of cells, the TCI state includes the specific SSB and a CSI-RS (Tracking Reference Signal) for tracking QCL type A, and in the TCI state of the DeModulation Reference Signal (DMRS) for demodulating the Physical Downlink Control Channel (PDCCH) of each of the plurality of cells, the QCL type A reference signal is the TRS of the same cell, and the QCL type D reference signal is the SSB of a special cell included in the plurality of cells

Advantages of the Invention

[0010] According to an aspect of the present disclosure, the TCI state can be appropriately applied.

Brief Description of the Drawings

[0011]

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DETAILED DESCRIPTION OF THE INVENTION

[0012] (TCI, Spatial Relationship, QCL) In NR, it is considered to control at least one of signal and channel (expressed as signal / channel) in a UE, such as reception processing (e.g., at least one of reception, demapping, demodulation, decoding), transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, encoding), based on a Transmission Configuration Indication state (TCI state).

[0013] The TCI state may represent what is applied to a downlink signal / channel. What corresponds to the TCI state applied to an uplink signal / channel may be expressed as a spatial relation.

[0014] The TCI state is information regarding the quasi-co-location (QCL) of signals / channels, and may also be referred to as spatial reception parameters, spatial relation information, etc. The TCI state may be set for each UE for each channel or for each signal.

[0015] QCL is an indicator showing the statistical properties of signals / channels. For example, when a certain signal / channel and another signal / channel are in a QCL relationship, it may mean that at least one of Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is the same (QCL with respect to at least one of these) among these different multiple signals / channels.

[0016] Note that the spatial reception parameter may correspond to the reception beam of the UE (e.g., reception analog beam), and the beam may be specified based on spatial QCL. QCL (or at least one element of QCL) in the present disclosure may be read as sQCL (spatial QCL).

[0017] Multiple types (QCL types) of QCL may be defined. For example, four QCL types A - D may be provided with different parameters (or parameter sets) that can be assumed to be the same, and the parameters (which may also be referred to as QCL parameters) are shown below: · QCL type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread, · QCL type B (QCL-B): Doppler shift and Doppler spread, · QCL type C (QCL-C): Doppler shift and average delay, ·QCL Type D (QCL-D): Spatial reception parameter.

[0018] The information of QCL shown in the above QCL Types A to D may be referred to as QCL property.

[0019] The assumption by the UE that a certain control resource set (Control Resource Set (CORESET)), channel or reference signal is in relation to another CORESET, channel or reference signal and a specific QCL (e.g., QCL Type D) may be referred to as QCL assumption.

[0020] The UE may determine at least one of the transmission beam (Tx beam) and reception beam (Rx beam) of the signal / channel based on the TCI state or QCL assumption of the signal / channel.

[0021] The TCI state may be, for example, information regarding the QCL between a target channel (in other words, the reference signal (Reference Signal (RS)) for the channel) and another signal (e.g., another RS). The TCI state may be set (indicated) by upper layer signaling, physical layer signaling or a combination thereof.

[0022] The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI)).

[0023] The channel for which the TCI state or spatial relation is set (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0024] Also, the RS having a QCL relation with the channel may be, for example, at least one of a synchronization signal block (Synchronization Signal Block (SSB)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a sounding reference signal (Sounding Reference Signal (SRS)), a CSI-RS for tracking (also called a Tracking Reference Signal (TRS)), and a reference signal for QCL detection (also called a QRS).

[0025] The SSB is a signal block including at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)), a secondary synchronization signal (Secondary Synchronization Signal (SSS)), and a physical broadcast channel (Physical Broadcast Channel (PBCH)). The SSB may be called an SS / PBCH block.

[0026] The RS of QCL type X in the TCI state may mean an RS having a QCL type X relation with a certain channel / signal (DMRS of the channel / signal), and this RS may be called the QCL source of QCL type X in the TCI state.

[0027] (Switching of the TCI state) In Rel.15 / 16, an active TCI switch delay (TCI switch delay) is defined for the switching of the active TCI state for a UE with one or more TCI states configured in the serving cell.

[0028] Even if the UE measures / saves / holds QCL characteristics, the NW cannot recognize whether the UE measures / saves / holds QCL characteristics unless the UE sends L1-RSRP reports / beam reports to the network (NW, e.g., a base station). Therefore, the UE needs to perform beam / RS measurement and reporting so that the UE and the NW have a common understanding of whether the TCI state is Known or Unknown.

[0029] In Rel.16, the TCI state being Known means satisfying the following Conditions 0 - 5; (Condition 0): From the last transmission of the RS resource used for reporting the L1-RSRP measurement of the target TCI state until the active TCI state switching is completed, the RS resource for L1-RSRP measurement is the RS of the target TCI state or the RS in a QCL relationship with the target TCI state. (Condition 1): The TCI state switch command is received within 1280 ms from the last transmission of the RS resource for beam reporting or measurement. (Condition 2): The UE has sent at least one L1-RSRP report for the target TCI state before the TCI state switch command. (Condition 3): During the TCI state switching period, the detection of the TCI state remains possible. (Condition 4): During the TCI state switching period, the detection of the SSB associated with the TCI state remains possible. (Condition 5) The Signal to Noise Ratio (SNR) of the TCI state is -3 dB or more.

[0030] The TCI state being unknown means that the TCI state is not known.

[0031] In the present disclosure, the known TCI state may be referred to as the "Known TCI State", and the unknown TCI state may be referred to as the "Unknown TCI State".

[0032] When using MAC CE for TCI state switching (MAC-CE based TCI state switch), if the target TCI state (the TCI state to be switched to) is a known TCI state, when the UE receives a Physical Downlink Shared Channel (PDSCH) containing an activation command (TCI state indication) for the TCI state in slot n, in the first slot after slot n + T HARQ +3N subframe,μ slot +TO k *(T first-SSB +T SSB-proc ), / (NR slot length), the UE can receive the Physical Downlink Control Channel (PDCCH) of the target TCI state of the serving cell where the TCI state switching occurred. Also, the UE can receive the PDCCH of the old (pre-switching) TCI state until slot n + T HARQ +3N subframe,μ slot . Until slot n + T HARQ +3N subframe,μ slot From slot n + T HARQ +3N subframe,μ slot +TO k *(T first-SSB +T SSB-proc ), / (NR slot length), the TCI state applied by the UE is not defined (undefined) (see Figure 1).

[0033] Here, T HARQindicates the timing from the transmission of the downlink data signal (e.g., PDSCH) to the acknowledgement. N subframe,μ slot represents the number of slots per subframe for the subcarrier configuration μ. T first-SSB is the time from when the UE decodes the MAC CE command used for the activation of the TCI state until it transmits the first SSB. T SSB-proc is 2 ms. TO k is 1 if the target TCI state is not included in the list of active TCI states for the PDSCH, and 0 otherwise. The NR slot length indicates the length of the slot.

[0034] Figure 2 is a diagram showing an example of the TCI states defined up to Rel. 16. As shown in Figure 2, the TCI state of the PDCCH indicates the QCL type A / D relationship between the demodulation reference signal (DMRS) for the PDCCH and the TRS (or CSI-RS, here TRS#1). Also, the TCI state of the TRS indicates the QCL type C / D relationship between the TRS and the SSB (here SSB#1).

[0035] In the case of using the MAC CE for switching the TCI state and when the target TCI state is an unknown TCI state, when the UE receives a PDSCH containing the activation command for the TCI state in slot n, at the first slot after slot n + T HARQ + 3N subframe,μ slot + T L1-RSRP + TO uk * (T first-SSB + T SSB-proc ) / (NR slot length), the UE can receive the PDCCH of the target TCI state of the serving cell where the TCI state switching occurred. Also, the UE can receive the PDCCH of the old (before switching) TCI state until slot n + T HARQ + 3N subframe,μ slot up to.

[0036] Here, TO uk is 1 for L1-RSRP measurement using CSI-RS or for switching of TCI states where QCL types other than QCL type D are set. On the other hand, TO uk is the switching of TCI states where at least QCL type D is set and is 0 for L1-RSRP measurement using SSB.

[0037] Also, T first-SSB is the time until the first SSB is transmitted after L1-RSRP measurement when switching of TCI states where at least QCL type D is set is performed. Alternatively, T first-SSB is the time until the first SSB is transmitted after the UE decodes the MAC CE command used for activation of TCI states where QCL types other than QCL type D are set.

[0038] When the target TCI state is an unknown TCI state as compared to the case where the target TCI state is a known TCI state, an additional time of T L1-RSRP is required for switching of the TCI state. T L1-RSRP is a time related to received power measurement. T L1-RSRP is 0 when in frequency range (FR) 1 or when FR2 where QCL type D is not set. Otherwise, it is the time required for determination / refinement of received beams in FR2.

[0039] Also, in the case of using downlink control information (DCI) for switching of the TCI state (DCI based TCI state switch), when the target TCI state is a known TCI state, if the upper layer parameter tci-PresentInDCI for the CORESET that schedules the PDSCH is set to enabled for the UE in slot n, the UE can receive the PDSCH of the target TCI state of the serving cell where the TCI state switching occurred in the first slot after slot n + timeDurationForDCI. Here, timeDurationForDCI is the time required for receiving the PDCCH and applying it to the reception of DCI for the PDSCH of the spatial relationship / QCL related information (spatial QCL information).

[0040] Furthermore, in the case of using RRC signaling for switching of the TCI state (RRC based TCI state switch), when the target TCI state is a known TCI state, if the UE receives the PDSCH that transmits the RRC activation command for the TCI state in slot n, the UE can receive the PDCCH of the target TCI state of the serving cell where the TCI state switching occurred in the first slot after slot n + (T RRC_processing + TO k *(T first-SSB + T SSB-proc )) / (NR slot length).

[0041] Here, T RRC_processing is the delay related to the RRC process (RRC processing delay). T first-SSB is the time until the UE first transmits the SSB after the RRC process. T SSB-proc , TO k and (NR slot length) are the same as in the case of a known TCI state in the switching of the TCI state using the MAC CE.

[0042] Also, in the case of using RRC signaling for switching of TCI states (RRC based TCI state switch), when the target TCI state is an unknown TCI state, when the UE receives a PDSCH that transmits an RRC activation command for the TCI state in slot n, in the first slot after slot n + (T RRC_processing +T L1-RSRP +TO uk *(T first-SSB +T SSB-proc )) / (NR slot length), the UE can receive the PDCCH of the target TCI state of the serving cell where the switching of the TCI state has occurred.

[0043] Here, T RRC_processing is the delay related to the RRC process (RRC processing delay). T SSB-proc , TO uk and (NR slot length) are the same as in the case of an unknown TCI state in the switching of the TCI state using MAC CE.

[0044] Also, T first-SSB is the time from after the L1 - RSRP measurement when performing the switching of the TCI state where at least QCL type D is set until the first SSB is transmitted. Alternatively, T first-SSB is the time from after the UE decodes the MAC CE command used for the activation of the TCI state where a type other than QCL type D is set until the first SSB is transmitted.

[0045] As described above, since the UE needs to receive the MAC CE for the activation / switching of the TCI state and wait for the reception of the SSB after transmitting the response signal (ACK) for the MAC CE, a delay time (for example, about 20 ms) will occur until the TCI state is actually switched. It is desirable to reduce this delay time from the perspective of low latency.

[0046] However, the consideration for reducing this delay time is not sufficient. If this consideration is not sufficient, there is a risk of causing a deterioration in communication quality, a decrease in throughput, and the like.

[0047] Also, when carrier aggregation (CA) is configured, there may be a case where beam reporting (for example, beam reporting based on L1-RSRP / L1-SINR measurements (L1-RSRP / L1-SINR beam reporting)) is configured for a certain CC, and the beam reporting is not configured for other CCs. This is because when performing CA in the same band, it is assumed that the same TCI state is configured for all CCs, so there is no need to configure the beam reporting for each CC.

[0048] On the other hand, since it is determined for each serving cell whether the TCI state is known or unknown, there is a concern that the known / unknown conditions are different for each cell (CC). Specifically, there is a possibility that the known TCI state in the CC where beam reporting is performed becomes an unknown TCI state in the CC where beam reporting is not performed.

[0049] Thus, when the known / unknown conditions are different for each CC, the delay time required for switching / activating the TCI state for each CC is different, which may cause a deterioration in communication quality, a decrease in throughput, and the like.

[0050] FIG. 3 is a diagram showing an example of the configuration of beam reporting for a plurality of CCs. In the example shown in FIG. 3, L1-RSRP beam reporting is configured for CC#0, and L1-RSRP beam reporting is not configured for CC#1-#3. In an example like that shown in FIG. 3, the TCI state instructed to the UE in CC#0 is the TCI state based on the latest beam report, and since the TCI state is a known TCI state, the delay time required for switching / activating the TCI state is reduced.

[0051] On the one hand, since beam reports are not performed in CC#1 - #3, a known TCI state in CC#0 can become an unknown TCI state in CC#1 - #3. In this case, the delay time required for switching / activation of the TCI state is not reduced in CC#1 - #3, and the delay time required for switching / activation of the TCI state will be different between CC#0 and CC#1 - #3.

[0052] Therefore, the inventors conceived a method for determining the delay time required for switching the TCI state to solve the above problems.

[0053] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The wireless communication methods according to the respective embodiments may be applied individually or in combination.

[0054] In the present disclosure, "A / B / C" and "at least one of A, B, and C" may be read interchangeably. In the present disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, band may be read interchangeably. In the present disclosure, index, ID, indicator, resource ID may be read interchangeably. In the present disclosure, support, control, be able to control, operate, be able to operate may be read interchangeably.

[0055] In the present disclosure, configure, activate, update, indicate, enable, specify, select, switch may be read interchangeably.

[0056] In the present disclosure, MAC CE, activation / deactivation command may be read interchangeably.

[0057] In the present disclosure, the upper layer signaling may be any one of, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameters, upper layer, upper layer parameters, RRC information element (IE), RRC message may be read interchangeably with each other.

[0058] MAC signaling may use, for example, a MAC control element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0059] In the present disclosure, beam, spatial domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, TCI assumption, QCL assumption, QCL parameter, spatial domain receive filter, UE spatial domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS of QCL type D for TCI state / QCL assumption, RS of QCL type A for TCI state / QCL assumption, spatial relation, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, PL-RS may be read interchangeably with each other. In the present disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS having QCL type X, source of DL-RS, SSB, CSI-RS, SRS may be read interchangeably with each other.

[0060] UL DCI, DCI for scheduling a UL channel (e.g., PUSCH), DCI format 0_x (x = 0, 1, 2,...) may be read interchangeably with each other. DL DCI, DCI for scheduling a DL channel (PDSCH), DCI format 1_x (x = 0, 1, 2,...) may be read interchangeably with each other.

[0061] In the present disclosure, HARQ-ACK information, ACK, NACK may be read interchangeably with each other.

[0062] In the present disclosure, pool, set, group, list, candidate may be read interchangeably with each other.

[0063] In the present disclosure, beam, spatial domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, unified beam, common TCI state, TCI state for DMRS for PDCCH, TCI state for DMRS for PDSCH, common beam, TCI assumption, QCL assumption, QCL parameter, spatial domain reception filter, UE spatial domain reception filter, UE reception beam, DL beam, DL reception beam, DL precoding, DL precoder, DL-RS, RS of QCL type D of TCI state / QCL assumption, RS of QCL type A of TCI state / QCL assumption, spatial relationship, spatial domain transmission filter, UE spatial domain transmission filter, UE transmission beam, UL beam, UL transmission beam, UL precoding, UL precoder, PL-RS may be read as each other. In the present disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS having QCL type X, source of DL-RS, SSB, CSI-RS, SRS may be read as each other.

[0064] In the present disclosure, a panel, an Uplink (UL) transmission entity, a point, a TRP, a spatial relationship, a Control Resource SET (CORESET), a PDSCH, a codeword, a base station, an antenna port of a certain signal (for example, a Demodulation Reference Signal (DMRS) port), an antenna port group of a certain signal (for example, a DMRS port group), a group for multiplexing (for example, a Code Division Multiplexing (CDM) group, a reference signal group, a CORESET group), a CORESET pool, a CORESET subset, a CW, a redundancy version (RV), a layer (MIMO layer, transmission layer, spatial layer) may be read as each other. Also, a panel Identifier (ID) and a panel may be read as each other. In the present disclosure, a TRP index, a TRP ID, a CORESET pool index, the ordinal numbers (first, second) of the TCI states in two TCI states, a TRP may be read as each other.

[0065] Each embodiment of the present disclosure is also appropriately applicable in the switching / activation of a common / unified TCI state.

[0066] (Wireless communication method) In the present disclosure, a signaling configuration, signaling, a setting, a configuration, setting information, an indication, indication information, etc. may be read as each other. Also, in the present disclosure, storage, retention, maintenance, etc. may be read as each other.

[0067] In each embodiment of the present disclosure, the QCL characteristic may mean information regarding a specific QCL type. The specific QCL type may be a QCL type D or another QCL type.

[0068] In the present disclosure, the application slot (application timing) of the MAC-CE based TCI state switch, slot n+T HARQ +3N subframe,μ slot +TO k *(T first-SSB +T SSB-proc ) / NR slot length (when the target TCI state is known), slot n+T HARQ +3N subframe,μ slot +T L1-RSRP +TO uk *(T first-SSB +T SSB-proc ) / NR slot length (when the target TCI state is unknown) may be read interchangeably with each other.

[0069] In the present disclosure, the delay of the MAC-CE based TCI state switch (MAC-CE based TCI state switch delay, delay time), T HARQ +3N subframe,μ slot +TO k *(T first-SSB +T SSB-proc ) / NR slot length (when the target TCI state is known), T HARQ +3N subframe,μ slot +T L1-RSRP +TO uk *(T first-SSB +T SSB-proc ) / NR slot length (when the target TCI state is unknown) may be read interchangeably with each other.

[0070] In the present disclosure, the offset time for SSB reception, the item of the offset time for SSB reception, TO k *(T first-SSB +T SSB-proc ) / NR slot length (when the target TCI state is known), TO uk *(T first-SSB +T SSB-proc) / NR slot length (when the target TCI state is unknown) may be read out interchangeably with each other.

[0071] <First Embodiment> In the first embodiment, a method for retaining / storing QCL characteristics will be described.

[0072] 《Embodiment 1-1》 The UE may store the QCL characteristics of a subset of RSs (one or more RSs).

[0073] The UE may be configured / instructed to store the QCL characteristics. For example, the UE may receive configuration information / indication information for configuring / indicating the storage of the QCL characteristics.

[0074] For example, when the storage of the QCL characteristics is configured / instructed for the UE, the UE may measure / store the QCL characteristics regarding the QCL source RS. The QCL source RS may be, for example, the source RS of QCL type D for the TCI state for PDCCH / PDSCH, or may be an SSB / CSI-RS. In the present disclosure, the QCL source RS may be referred to as a root SSB, a QCL source SSB, a source SSB.

[0075] When the TCI state (for example, the TCI state for DMRS for PDCCH / PDSCH / common TCI state) is known, the UE may measure / store the QCL characteristics regarding the TCI state. When the TCI state is unknown, the UE may not be required to measure / store the QCL characteristics regarding the TCI state.

[0076] FIG. 4 is a diagram showing an example of the storage of the QCL characteristics according to Embodiment 1-1. In FIG. 4, TCI states #1-#3 which are active TCI states are configured for the UE. Here, TCI states #1 and #2 are known TCI states, and TCI state #3 is an unknown TCI state.

[0077] In FIG. 4, the UE measures / saves the QCL characteristics of SSB#1, which is the QCL source RS of TCI state #1 in the known TCI state, and the QCL characteristics of SSB#2, which is the QCL source RS of TCI state #2, respectively. On the other hand, the UE is not required to measure / save the QCL characteristics of SSB#3, which is the QCL source RS of TCI state #3 in the unknown TCI state.

[0078] Note that in the above, an example where the preservation of QCL characteristics regarding an unknown TCI state is not required has been described, but the UE may perform the preservation of QCL characteristics regarding an unknown TCI state.

[0079] According to Embodiment 1-1, the preservation of QCL characteristics regarding the TCI state can be appropriately performed.

[0080] 《Embodiment 1-2》 In Embodiment 1-2, the method for setting / indicating the preservation of QCL characteristics for the UE will be described. The UE may be set / indicated to preserve the QCL characteristics based on at least one of the following Embodiments 1-2-1 to 1-2-5.

[0081] [Embodiment 1-2-1] The UE may receive the setting information regarding the preservation of QCL characteristics by using upper layer signaling (RRC signaling).

[0082] The setting information regarding the preservation of QCL characteristics may be a parameter (e.g., enableQCLStore) for setting (activation) of the preservation of QCL characteristics included in a specific RRC information element. The UE may determine to preserve the QCL characteristics regarding the TCI state when at least one of the cases where the parameter is set and the parameter is effectively set occurs.

[0083] The UE may be set to preserve the QCL characteristics for each CC / BWP / UE / band. In other words, the setting information may be set for each CC / BWP / UE / band.

[0084] Also, the UE may be configured to preserve QCL characteristics for multiple CCs, multiple BWPs, multiple UEs, or multiple bands. In other words, the configuration information may be configured for multiple CCs, multiple BWPs, multiple UEs, or multiple bands.

[0085] [Embodiment 1-2-2] The UE may receive configuration information regarding the preservation of QCL characteristics. The configuration information may be information regarding the number of reports of the power / quality of the measurement signal (e.g., L1-RSRP / L1-SINR).

[0086] For example, the UE may preserve the QCL characteristics of the QCL source RS (root SSB) for the top X beams (CSI-RS resource indicator (CRI) / SSB resource indicator (SSBRI)) in the L1-RSRP / L1-SINR report (where X is an integer, e.g., 1, 2, or 4).

[0087] The above X may be predefined in the specification or may be set for the UE by upper layer signaling. Also, the above X may be less than or equal to the number of beam (CRI / SSBRI) reports in L1-RSRP / L1-SINR. Also, the above X may be the same value as the number of beam (CRI / SSBRI) reports in L1-RSRP / L1-SINR.

[0088] The UE may configure the above X for each CC / BWP / UE / band. In other words, the above X may be configured for each CC / BWP / UE / band.

[0089] Also, the UE may configure the above X for multiple CCs, multiple BWPs, multiple UEs, or multiple bands. In other words, the above X may be configured for multiple CCs, multiple BWPs, multiple UEs, or multiple bands.

[0090] Embodiment 1-2-2 may be applied in at least one of the cases where the upper layer parameters described in Embodiment 1-2-1 are set and where the above X is set.

[0091] According to Embodiment 1-2-2, the number of QCL characteristics to be stored can be limited, so the memory burden on the UE can be reduced.

[0092] [Embodiment 1-2-3] The UE may receive information indicating the TCI state related to the QCL characteristics to be stored by using RRC signaling / MAC CE. The UE may set / be instructed to set the QCL characteristics to be stored based on the information indicating the TCI state.

[0093] For example, the information indicating the TCI state may be a list including one or more TCI state IDs. For example, the UE may determine to store the QCL characteristics of the root SSB of the TCI state included in the list. For example, a list of TCI state IDs for setting / instructing the UE to store QCL characteristics is set, and the list includes TCI state #1, TCI state #20, TCI state #35, and TCI state #51. At this time, the UE measures / stores the QCL characteristics of the root SSB of TCI state #1, TCI state #20, TCI state #35, and TCI state #51.

[0094] Note that the information indicating the TCI state may be set for each CC / BWP / UE / band, or may be set for a plurality of CCs, a plurality of BWPs, a plurality of UEs, or a plurality of bands.

[0095] According to Embodiment 1-2-3, flexible instruction for storing QCL characteristics can be enabled.

[0096] [Embodiment 1-2-4] The UE may receive information indicating the TCI state related to the QCL characteristics to be stored by using RRC signaling / MAC CE. The UE may be configured / instructed to store the QCL characteristics based on the information indicating the TCI state.

[0097] For example, the information indicating the TCI state may be a list including one or more RS IDs. The RS ID may be an SSB ID. For example, the UE may determine to store the QCL characteristics of the SSB corresponding to the SSB ID included in the list.

[0098] For example, for the UE, a list of SSB IDs for configuring / instructing the storage of QCL characteristics is configured, and the list includes SSB#1, SSB#20, SSB#35, and SSB#51. At this time, the UE measures / stores the QCL characteristics of the SSBs corresponding to SSB#1, SSB#20, SSB#35, and SSB#51.

[0099] Also, the RS ID may be a TRS ID / CSI-RS ID. For example, the UE may determine to store the QCL characteristics of the root SSB of the TRS / CSI-RS corresponding to the TRS ID / CSI-RS ID included in the list.

[0100] For example, for the UE, a list of TRS IDs for configuring / instructing the storage of QCL characteristics is configured, and the list includes TRS#1, TRS#20, TRS#35, and TRS#51. At this time, the UE measures / stores the QCL characteristics of the root SSB of the TRS corresponding to each of TRS#1, TRS#20, TRS#35, and TRS#51.

[0101] Note that the information indicating the TCI state may be set for each CC / BWP / UE / band, or may be set for a plurality of CCs, a plurality of BWPs, a plurality of UEs, or a plurality of bands.

[0102] According to Embodiment 1-2-4, it is possible to flexibly instruct the storage of QCL characteristics.

[0103] [Embodiment 1-2-5] The UE may receive information indicating the TCI state related to the QCL characteristics to be stored by using RRC signaling / MAC CE. The UE may be configured / instructed to set the QCL characteristics to be stored based on the information indicating the TCI state.

[0104] For example, the information indicating the TCI state may be a list including one or more CORESET IDs. The UE may determine to store the QCL characteristics of the root SSB of the TCI state of the CORESET corresponding to the CORESET ID included in the list.

[0105] For example, for the UE, a list of CORESET IDs for configuring / instructing the storage of QCL characteristics is set, and the list includes CORESET#1 and CORESET#2. At this time, the UE measures / stores the QCL characteristics of the root SSB of the TCI state of the CORESET corresponding to each of CORESET#1 and CORESET#2.

[0106] Note that the information indicating the TCI state may be set for each CC / BWP / UE / band, or may be set for a plurality of CCs, a plurality of BWPs, a plurality of UEs, or a plurality of bands.

[0107] According to Embodiment 1-2-5, it is possible to flexibly instruct the storage of QCL characteristics.

[0108] According to the above Embodiment 1-2, it is possible to appropriately configure / instruct the storage of QCL characteristics related to the TCI state.

[0109] 《Embodiment 1-3》 In Embodiment 1-3, a method for controlling the delay time related to the switching of the TCI state will be described. When the measurement / storage of the QCL characteristics related to the root SSB of the TCI state is performed in the UE, the delay time related to the switching of the TCI state may be determined.

[0110] Based on whether the QCL characteristics of the root SSB in the TCI state are measured / stored, among the delay times related to the switching / activation of the TCI state, the delay time related to waiting for the reception of the SSB (e.g., TO k *(T first-SSB +T SSB-proc ) / (NR slot length)) may be added, that is, it may be determined whether TO k becomes 0 or 1.

[0111] For example, if the UE has measured / stored the QCL characteristics of the root SSB in the TCI state, TO k may be determined to be 0. Also, if the UE has not stored the QCL characteristics of the root SSB in the TCI state, TO k may be determined to be 1.

[0112] [Embodiment 1-3-1] The UE may receive configuration information regarding the storage of QCL characteristics. The UE may determine whether to add the delay time related to waiting for the reception of the SSB based on whether the configuration information regarding the storage of QCL characteristics is configured.

[0113] For example, if the parameter for configuring the storage of QCL characteristics (e.g., enableQCLStore) included in a specific RRC information element is not configured and the target TCI state is not included in the list of active TCI states for the PDSCH, the UE may determine that the delay time related to waiting for the reception of the SSB is added. For example, if the parameter for configuring the storage of QCL characteristics included in a specific RRC information element is not configured and the target TCI state is not included in the list of active TCI states for the PDSCH, TO k may be determined to be 1. Otherwise (for example, when the parameter for configuring the storage of QCL characteristics (e.g., enableQCLStore) included in a specific RRC information element is configured), the delay time related to waiting for the reception of the SSB is not added (TO kIt may be determined that it is 0).

[0114] Note that Embodiment 1-3-1 may be applied in a case where the above Embodiment 1-2-1 is applied.

[0115] [Embodiment 1-3-2] The UE may receive configuration information regarding the preservation of QCL characteristics. The configuration information may be information regarding the reporting count (e.g., the above X) of the power / quality of the measurement signal (e.g., L1-RSRP / L1-SINR).

[0116] For example, the UE may report the top X beams (CRI / SSBRI) in the L1-RSRP / L1-SINR report and preserve the QCL characteristics of the root SSB of the TCI state associated with the reported beams. If the target TCI state is not included in the TCI states associated with the preserved QCL characteristics and the target TCI state is not included in the list of active TCI states for the PDSCH, the UE may determine that a delay time associated with waiting for the reception of the SSB is added. For example, if the target TCI state is not included in the TCI states associated with the preserved QCL characteristics and the target TCI state is not included in the list of active TCI states for the PDSCH, TO k It may be determined that it is 1. Otherwise (e.g., if the target TCI state is included in the TCI states associated with the preserved QCL characteristics), the delay time associated with waiting for the reception of the SSB is not added (TO k is 0).

[0117] Note that Embodiment 1-3-2 may be applied in a case where at least one of the above Embodiments 1-2-1 and 1-2-2 is applied.

[0118] [Embodiment 1-3-3] The UE may receive information (e.g., TCI state ID) indicating the TCI state related to the QCL characteristics to be saved by using RRC signaling / MAC CE, and save the QCL characteristics of the root SSB of the TCI state based on this information. The UE may determine whether an additional delay time related to waiting for the reception of the SSB is added based on whether the target TCI state is included in the TCI states related to the saved QCL characteristics.

[0119] For example, if the target TCI state is not included in the TCI states related to the saved QCL characteristics and the target TCI state is not included in the list of active TCI states for the PDSCH, the UE may determine that an additional delay time related to waiting for the reception of the SSB is added. For example, if the target TCI state is not included in the TCI states related to the saved QCL characteristics and the target TCI state is not included in the list of active TCI states for the PDSCH, the UE k may determine that TO is 1. Otherwise (e.g., if the target TCI state is included in the TCI states related to the saved QCL characteristics), it may be determined that no additional delay time related to waiting for the reception of the SSB is added (TO k is 0).

[0120] Note that Embodiment 1-3-3 may be applied in the case where the above Embodiment 1-2-3 is applied.

[0121] [Embodiment 1-3-4] The UE may receive information (e.g., RS ID related to the TCI state) indicating the TCI state related to the QCL characteristics to be saved by using RRC signaling / MAC CE, and save the QCL characteristics of the related SSB based on this information. The UE may determine whether an additional delay time related to waiting for the reception of the SSB is added based on whether the target TCI state is included in the TCI states related to the saved QCL characteristics.

[0122] For example, if the QCL characteristics of the target TCI state are not included in the stored QCL characteristics and the target TCI state is not included in the list of active TCI states for PDSCH, the UE may determine that a delay time associated with waiting for the reception of the SSB is added. For example, if the QCL characteristics of the target TCI state are not included in the stored QCL characteristics and the target TCI state is not included in the list of active TCI states for PDSCH, the UE k may determine that TO k is 1. Otherwise (for example, if the QCL characteristics of the target TCI state are included in the stored QCL characteristics), the UE may determine that the delay time associated with waiting for the reception of the SSB is not added (TO

[0123] Note that Embodiment 1-3-4 may be applied in a case where the above Embodiment 1-2-4 is applied.

[0124] [Embodiment 1-3-5] The UE may receive information (e.g., CORESET ID) indicating the TCI state related to the QCL characteristics to be stored by using RRC signaling / MAC CE, and store the QCL characteristics of the root SSB of the TCI state based on the information. The UE may determine whether a delay time associated with waiting for the reception of the SSB is added based on whether the target TCI state is included in the TCI state related to the stored QCL characteristics.

[0125] For example, if the target TCI state is not included in the TCI state related to the stored QCL characteristics and the target TCI state is not included in the list of active TCI states for PDSCH, the UE may determine that a delay time associated with waiting for the reception of the SSB is added. For example, if the target TCI state is not included in the TCI state related to the stored QCL characteristics and the target TCI state is not included in the list of active TCI states for PDSCH, the UE kIt may be determined that it is 1. If not (for example, when the target TCI state is included in the TCI state related to the stored QCL characteristics), the delay time related to waiting for the reception of the SSB is not added (TO k is determined to be 0).

[0126] Note that Embodiment 1-3-5 may also be applied in a case where the above Embodiment 1-2-5 is applied.

[0127] According to the above Embodiments 1-3, along with the preservation of the QCL characteristics, it is possible to appropriately reduce the delay time related to the switching / activation of the TCI state.

[0128] <Second Embodiment> In the second embodiment, the activation / switching of the TCI state based on an RS other than the SSB (for example, CSI-RS / TRS) will be described. Note that in the present disclosure, the activation / switching of the TCI state may also mean the determination of a spatial domain filter applied to the transmission and reception of a signal / channel.

[0129] The UE may obtain QCL characteristics by measuring an RS other than the SSB (for example, CSI-RS / TRS) without receiving the SSB or before receiving the SSB. Also, even when the UE can obtain QCL characteristics by measuring an RS other than the SSB (for example, CSI-RS / TRS), the UE may preserve the QCL characteristics of the SSB described in the first embodiment above.

[0130] A capability indicating whether to support the acquisition of QCL characteristics based on the measurement of an RS other than the SSB (for example, CSI-RS / TRS) may be defined. When the UE reports the support for the capability (capability information) to the NW, among the delay times related to the switching / activation of the TCI state, the delay time related to waiting for the reception of the SSB (for example, TO k *(T first-SSB +T SSB-proc ) / (NR slot length)) is not added (that is, TOk It may be assumed that it is 0).

[0131] The UE may determine whether to add a delay time related to waiting for reception of the SSB based on whether a parameter (e.g., tciActivationWithoutSSB) for setting activation / switching of the TCI state based on measurement of an RS other than the SSB (e.g., CSI-RS / TRS) is set by the NW.

[0132] For example, the UE may determine that a delay time related to waiting for reception of the SSB is added when a parameter (e.g., tciActivationWithoutSSB) for setting activation / switching of the TCI state based on measurement of an RS other than the SSB (e.g., CSI-RS / TRS) is not set and the target TCI state is not included in the list of active TCI states for the PDSCH. For example, the UE may determine that a delay time related to waiting for reception of the SSB is added when a parameter (e.g., tciActivationWithoutSSB) for setting activation / switching of the TCI state based on measurement of an RS other than the SSB (e.g., CSI-RS / TRS) is not set and the target TCI state is not included in the list of active TCI states for the PDSCH. For example, the UE may determine that TO k may be determined to be 1. Otherwise (e.g., when a parameter (e.g., tciActivationWithoutSSB) for setting activation / switching of the TCI state based on measurement of an RS other than the SSB (e.g., CSI-RS / TRS) is set), it may be determined that no delay time related to waiting for reception of the SSB is added (TO k is 0).

[0133] According to the second embodiment above, by performing activation / switching of the TCI state based on an RS other than the SSB, the delay time required for activation / switching of the TCI state can be reduced.

[0134] <Third Embodiment> In the third embodiment, the UE may report / send information related to the known TCI state to the NW. The information related to the known TCI state may be information (e.g., a list) including the TCI state ID of the known TCI state / RS ID of the known TCI state.

[0135] 《Embodiment 3-1》 The UE may use a MAC CE to send information related to the TCI state.

[0136] The MAC CE for information related to the TCI state may include a cell ID, a BWP ID, and one or more TCI state IDs / RS IDs. The TCI state ID / RS ID may be the TCI state ID / RS ID corresponding to the known TCI state. Note that the number of TCI state IDs / RS IDs included in the MAC CE may be variable.

[0137] When the UE reports / sends information related to the TCI state, it may be assumed that the delay time related to the switching / activation of the TCI state is set shorter compared to the delay time defined up to Rel. 16. More specifically, when the UE reports / sends information related to the TCI state, the delay time related to the switching / activation of the TCI state does not include the time related to received power measurement (e.g., T L1-RSRP ).

[0138] For example, when the UE performs a beam report based on received power / quality (e.g., L1-RSRP / L1-SINR), it may not be necessary to send / report information (TCI state ID / RS ID) related to the TCI state / RS related to the beam for which the beam report was performed.

[0139] The UE may send the MAC CE including only the TCI state ID / RS ID corresponding to the known TCI state. The NW may determine that the TCI state corresponding to the TCI state ID / RS ID not included in the MAC CE is an unknown TCI state.

[0140] The UE may transmit the MAC CE by including only the TCI state ID / RS ID corresponding to the unknown TCI state in the MAC CE. The NW may determine that the TCI state corresponding to the TCI state ID / RS ID not included in the MAC CE is the known TCI state.

[0141] In addition, the UE may transmit the MAC CE by including the TCI state ID / RS ID corresponding to the known TCI state and the TCI state ID / RS ID corresponding to the unknown TCI state in the MAC CE.

[0142] In addition, the MAC CE may include a field indicating whether the TCI state is a known TCI state or an unknown TCI state.

[0143] FIG. 5 is a diagram showing an example of the MAC CE according to Embodiment 3-1. In the example shown in FIG. 5, the MAC CE includes a bit field indicating the cell ID, a bit field indicating the BWP ID, one or more bit fields indicating the TCI state ID, and one or more bit fields (P1, P2,...) indicating the existence of the corresponding TCI state. When there is a bit field indicating the TCI state ID, the UE sets the bit field indicating the existence of the corresponding TCI state to a specific value (for example, 1).

[0144] Note that the configuration of the MAC CE shown in FIG. 5 is merely an example, and the size, position, and number of each field are not limited thereto. For example, reserved bits may be included at any position within the MAC CE of the present embodiment.

[0145] 《Modification Example of Embodiment 3-1》 In the above-described Embodiment 3-1, the case where the MAC CE includes a field indicating the TCI state ID / RS ID has been described. However, the MAC CE may include a bit field indicating whether the root SSB (QCL characteristics of the root SSB) has been measured / stored.

[0146] According to this method, for the NW, it is possible to show that the delay time associated with waiting for the reception of the SSB is not added (i.e., at least one of TO k and TO uk is 0), and it is possible to reduce the delay time required for the activation / switching of the TCI state.

[0147] Note that the MAC CE including the field indicating the TCI state ID / RS ID and the MAC CE including the field indicating whether the root SSB (QCL characteristics of the root SSB) has been measured / stored may be different MAC CEs.

[0148] Also, the same MAC CE may include a field indicating the TCI state ID / RS ID and a field indicating whether the root SSB (QCL characteristics of the root SSB) has been measured / stored. At this time, the MAC CE may include a field indicating whether the TCI state corresponding to the TCI state ID / RS ID is a known TCI state or an unknown state.

[0149] 《Embodiment 3-2》 The UE may use the uplink control information (UCI) to transmit information related to the TCI state. For example, the UE may use the UCI for beam reporting to transmit information related to the TCI state.

[0150] The beam reporting may be beam reporting using L1-RSRP / L1-SINR or beam reporting using CSI. Also, the information related to the TCI state may be the TCI state ID of a known TCI state.

[0151] For example, when the reporting of the TCI state ID of a known TCI state is set / indicated for the UE, the UE may report / transmit one or more TCI state IDs of the known TCI state using the UCI as part of the beam reporting.

[0152] The number of bits (size) of UCI recognized by the UE and the number of bits of UCI recognized by the NW should be equal. The NW may set the number of TCI state IDs or the number of UCI bits. The UE may drop the TCI state IDs included in the UCI based on the number of bits of UCI instructed by the NW. For example, if the number of bits of UCI including the TCI state ID transmitted by the UE is larger than the number of bits of UCI instructed by the NW, the UE may drop the bit information of the TCI state ID so that it becomes equal to the instructed number of bits. The dropping of the bit information may be selected in order from those with lower received power / quality by the UE (e.g., L1-RSRP / L1-SINR). Also, if the number of bits of UCI including the TCI state ID transmitted by the UE is smaller than the number of bits of UCI instructed by the NW, the UE may pad with a specific value (e.g., 0) so that it becomes equal to the instructed number of bits.

[0153] Also, the UE may be set / instructed to report a number of beam reports larger than a specific number (e.g., 4).

[0154] At this time, the UE may report the beam indexes (e.g., SSB index / CSI-RS index) and the measured received power / quality values (e.g., L1-RSRP / L1-SINR values) of the set / instructed number in the same manner as the operations defined in Rel.15 / 16. The measured received power / quality values (e.g., L1-RSRP / L1-SINR values) may have a specific number of bits (e.g., 4) for each beam.

[0155] Also, the UE may report the measured received power / quality values (e.g., L1-RSRP / L1-SINR values) of a specific number of beams (e.g., 4 beams) and the beam indexes of the remaining beams (e.g., SSBRI / CRI, without the measured received power / quality values). According to this, the number of bits of UCI can be reduced.

[0156] 《Modification Example of Embodiment 3-2》 In the above-described Embodiment 3-2, the case where the TCI state ID is included in the UCI has been described. However, the UCI may include information indicating whether the root SSB (QCL characteristics of the root SSB) has been measured / stored.

[0157] According to this method, it can be shown that the delay time related to waiting for reception of the SSB is not added to the NW (i.e., TO k / TO uk is 0), and the delay time required for activation / switching of the TCI state can be reduced.

[0158] According to the above-described Third Embodiment, the delay time related to reception power / quality measurement can be reduced, and the delay time required for activation / switching of the TCI state can be reduced.

[0159] <Fourth Embodiment> 《Embodiment 4-1》 For reducing the delay time related to waiting for reception of the SSB, aperiodic triggering / measurement / transmission of the SSB may be supported. The UE may perform switching / activation of the TCI state based on the aperiodic measurement of the SSB.

[0160] The UE may receive a higher layer parameter for setting / enabling aperiodic triggering / measurement / transmission of the SSB. When the higher layer parameter is set, the UE may perform switching / activation of the TCI state based on the SSB.

[0161] For example, in the switching of the TCI state based on MAC CE / RRC, aperiodic triggering / measurement / transmission of the SSB (root SSB) in a specific QCL type (e.g., QCL type A / QCL type C) relationship with the target TCI state may be used. The UE may determine that aperiodic triggering / measurement / transmission of the SSB is performed based on the information included in the MAC CE / RRC for setting / indicating the switching of the TCI state.

[0162] In addition, the UE may receive information indicating aperiodic triggering / measurement / transmission (reception) of the SSB by using MAC CE / DCI. For example, a field indicating aperiodic triggering / measurement / transmission of the SSB may be included in the MAC CE that instructs activation / update of the TCI state, or may be included in a MAC CE different from the MAC CE that instructs activation / update of the TCI state. Also, for example, a field indicating aperiodic triggering / measurement / transmission of the SSB may be included in the DCI that instructs activation / update of the TCI state, or may be included in a DCI (DCI format) different from the DCI (DCI format) that instructs activation / update of the TCI state.

[0163] According to Embodiment 4-1, it is possible to reduce the delay time related to waiting for reception of the SSB without changing the transmission period of the SSB.

[0164] 《Embodiment 4-2》 For reduction of the delay time related to reception power measurement (for example, T L1-RSRP ), when MAC CE-based TCI state switching / RRC-based TCI state switching is performed, an aperiodic beam report trigger corresponding to the SSB / CSI-RS related to the target TCI state may be performed by the MAC CE / RRC that sets / indicates the switching. Higher layer parameters regarding the aperiodic beam report trigger may be defined.

[0165] The UE may be set / indicated to trigger an aperiodic beam report corresponding to the SSB / CSI-RS related to the target TCI state based on the information included in the MAC CE / RRC that indicates the switching of the TCI state.

[0166] For example, during a period (e.g., a slot) used for transmitting HARQ-ACK (ACK / NACK) for a MAC CE that instructs activation of the TCI state, the UE may transmit UCI that transmits an aperiodic beam report of the received power / quality (e.g., L1-RSRP / L1-SINR) corresponding to the SSB / CSI-RS.

[0167] According to the fourth embodiment above, it is possible to reduce the delay time related to received power measurement without shortening the transmission period of the SSB.

[0168] <Fifth Embodiment> In the fifth embodiment, a method for determining the delay time required for switching / activating the TCI state in the case of using CA will be described.

[0169] Even when beam reporting (e.g., L1-RSRP / L1-SINR beam reporting) is not set in a certain CC (even if the TCI state / RS in a certain CC is unknown), if the QCL source RS (root SSB) of the TCI state / RS is the root SSB of a known TCI state, the UE can obtain the QCL characteristics (e.g., spatial domain filter information obtained by at least QCL type D) corresponding to the TCI state / RS in that CC.

[0170] That is, when the root SSB of a certain TCI state in a CC where beam reporting is not set is the same as the root SSB of a known TCI state, the UE may determine that the TCI state in the CC where beam reporting is not set is known.

[0171] At this time, among the delay time required for switching / activating the TCI state in that CC, the delay time related to received power measurement (e.g., T L1-RSRP ) may be reduced (e.g., T L1-RSRPIt may be 0). Also, at this time, the delay time required for switching / activation of the TCI state in that CC may be equal to the delay time required for switching / activation of the TCI state in the CC where the beam report is set.

[0172] For example, assume that a certain CSI-RS / TRS is set as the QCL type D RS in the TCI state for the PDCCH in CC#x, and the SSB#1 (root SSB) of CC#x is set as the QCL type D RS in the TCI state for that CSI-RS / TRS. Also, assume that another CSI-RS / TRS is set as the QCL type D RS in the TCI state for the PDCCH in CC#y, and the SSB#1 (the same root SSB) of CC#x is set as the QCL type D RS in the TCI state for that other CSI-RS / TRS. At this time, if the UE knows the TCI state for the PDCCH in CC#x, it may determine / assume that the TCI state for the PDCCH in CC#y is also known.

[0173] Note that, as described in this embodiment, the control of the delay time required for switching / activation of the TCI state in a CC where the beam report is not set may be applied when a specific upper layer (RRC) parameter (for example, tciActivationRootSSB) is set.

[0174] FIG. 6 is a diagram showing an example of the timeline of switching / activation of the TCI state in a certain CC defined up to Rel.15 / 16. In the example shown in FIG. 6, in a CC with a known TCI state, the switching / activation of the TCI state is performed after T HARQ +3N subframe,μ slot +TO k *(T first-SSB +T SSB-proc ) / (NR slot length). Also, the UE starts from after receiving the TCI transmission indication until THARQ +3N subframe,μ slot Up to that point, the old (pre-switching) TCI state is applied. After receiving the TCI transmission instruction, T HARQ +3N subframe,μ slot From after receiving the TCI transmission instruction, T HARQ +3N subframe,μ slot +TO k *(T first-SSB +T SSB-proc ) / (NR slot length), the TCI state applied by the UE is undefined.

[0175] Also, in the example shown in Figure 6, in the CC with the unknown TCI state, the switching / activation of the TCI state is from the reception of the TCI state activation command (TCI state indication), T HARQ +3N subframe,μ slot +T L1-RSRP +TO uk *(T first-SSB +T SSB-proc ) / (NR slot length) and then performed. Also, the UE applies the old (pre-switching) TCI state from after receiving the TCI transmission instruction until T HARQ +3N subframe,μ slot Up to that point. After receiving the TCI transmission instruction, T HARQ +3N subframe,μ slot From after receiving the TCI transmission instruction, T HARQ +3N subframe,μ slot +T L1-RSRP +TO uk *(T first-SSB +T SSB-proc ) / (NR slot length), the TCI state applied by the UE is not defined. As in the example shown in Figure 6, in the existing timeline, the delay time of the switching / activation of the TCI state is different between the CC corresponding to the known TCI state and the CC corresponding to the unknown TCI state.

[0176] FIG. 7 is a diagram showing an example of a timeline of switching / activation of the TCI state in a certain CC according to the fifth embodiment. In the example shown in FIG. 7, the delay time of switching / activation of the TCI state in the CC with the known TCI state (for example, the known TCI state in the CC where beam reporting is set) is the same as that in FIG. 6.

[0177] On the other hand, in the example shown in FIG. 7, assume that the root SSB of the TCI state of the CC where beam reporting is not set is the same as the root SSB of the known TCI state of the CC where beam reporting is set. In this case, as shown in FIG. 7, the switching / activation of the TCI state in the CC where beam reporting is not set is equal to the delay time of the switching / activation of the TCI state in the CC having the known TCI state (for example, the known TCI state in the CC where beam reporting is set).

[0178] FIG. 8 is a diagram showing an example of the TCI state and QCL relationship of a plurality of CCs. In FIG. 8, CC#0 which is a special cell (SpCell) (primary cell (PCell) or primary secondary cell (PSCell)), CC#1, CC#2, and CC#3 which are SCell are set. In each CC, SSB, TRS, and DMRS for PDCCH (simply referred to as DMRS) are transmitted.

[0179] Note that in the present disclosure, the DMRS for PDCCH may be read as the DMRS for PDSCH. Also, the TCI state for PDCCH may be read as the TCI state for PDSCH.

[0180] In the example shown in FIG. 8, the TRS of each CC is in the relationship with the SSB of CC#0 and QCL types C and D (which may be referred to as the TCI state for PDCCH in CC#N (N = 0, 1, 2, 3)), and the DMRS for PDCCH of each CC is in the relationship with the TRS of the same CC and QCL types A and D (which may be referred to as the TCI state of the TRS in CC#N). At this time, the TRS in the same CC that is in the relationship with DMRS and QCL type D in each CC all uses the SSB in CC#0 as the QCL source RS (root SSB). Also, L1-RSRP beam reporting is set in CC#0, and L1-RSRP beam reporting is not set in other CCs.

[0181] In FIG. 8, the TCI state (described as TCI state #1 of CC#0) for PDCCH in CC#0 where L1-RSRP beam reporting is set is known.

[0182] In this case, there is no need to apply unknown conditions in the switching / activation of the TCI state in CC#1 - CC#3. The UE may determine that the delay time related to received power measurement (e.g., T L1-RSRP ) is reduced (e.g., T L1-RSRP becomes 0). Also, the UE may determine / assume that the delay time required for the switching / activation of the TCI state in the CC where beam reporting is not set is equal to the delay time required for the switching / activation of the TCI state in the CC where beam reporting is set (the CC corresponding to the known TCI state).

[0183] FIG. 9 is a diagram showing another example of the TCI state and QCL relationship of multiple CCs. FIG. 9 is different from FIG. 8 in that the TRS in the same CC that is in the relationship with DMRS and QCL type D in CC#1 - CC#3 all uses the SSB in CC#1 as the QCL source RS (root SSB, and this root SSB is different from the root SSB of CC#0).

[0184] In the example shown in FIG. 9, when the TCI state #1 of CC#1 is known, the UE determines / assumes that the TCI state #1 of CC#2 and #3 is known. Also, in the example shown in FIG. 9, when the TCI state #1 of CC#1 is not known, the UE determines / assumes that the TCI state #1 of CC#2 and #3 is not known.

[0185] Note that only when the root SSB is common among CCs, the known or unknown relationship may be related / interlocked between different CCs. For example, in the example shown in FIG. 9, even if the TCI state of CC#0 is known, the TCI states of CC#1 - #3 having a root SSB different from that of CC#0 may not necessarily be known.

[0186] According to the above fifth embodiment, even when using carrier aggregation, it is possible to appropriately determine the delay time for switching / activating the TCI state.

[0187] <Sixth Embodiment> <Premise> When using MAC CE for switching the TCI state (MAC-CE based TCI state switch), if the MAC CE indicates a TCI state not included in the active TCI state list of the PDSCH, even if the indicated TCI state is a known TCI state, the UE may wait for SSB reception and apply the indicated TCI state.

[0188] When a common TCI state spanning a set of multiple CCs is associated with the same base station beam, the common TCI state may follow at least one of the following QCL sources 1 and 2.

[0189] [QCL Source 1] Separate QCL type D RSs may be determined from the common TCI state for each of the multiple CCs. The multiple QCL type D RSs determined for the set of multiple CCs are further associated with the same QCL type D RS.

[0190] In the example of FIG. 10, within the TCI state of the PDCCH DMRS of each cell (CC#0 to #3), the QCL type A RS and the QCL type D RS are the same TRS of the same cell.

[0191] [QCL source 2] One QCL type D RS may be determined from the common TCI state for the plurality of CCs. An extended QCL chain may be supported. The extended QCL chain may support Option A below, or Option B below, or both Options A and B.

[0192] [[Option A]] The TCI state includes a QCL type A TRS and, if any, a QCL type D TRS. The QCL type A TRS and the QCL type D TRS may be within the same CSI-RS resource or in different CSI-RS resources.

[0193] In the example of FIG. 11, within the TCI state of the PDCCH DMRS of each cell (CC#0 to #3), the QCL type A RS is the same TRS of the same cell, and the QCL type D RS is the TRS of the SpCell (CC#0).

[0194] [[Option B]] The TCI state includes a QCL type A TRS and, if any, a QCL type D SSB.

[0195] In the example of FIG. 12, within the TCI state of the PDCCH DMRS of each cell (CC#0 to #3), the QCL type A RS is the same TRS of the same cell, and the QCL type D RS is the SSB of the SpCell (CC#0).

[0196] 《Aspect》 If the QCL type D RS within the TCI state indicated by the MAC CE is the SSB, the UE may update the TCI state without waiting for the SSB reception. In other words, in the delay time of the MAC CE-based TCI state switch, the term of the offset time for SSB reception (TO k *(T first-SSB +T SSB-proc ) / NR slot length and TO uk *(T first-SSB +T SSB-proc ) / NR slot length, at least one of them) may not be included, the offset time for SSB reception may be 0, or the offset time for SSB reception may not be used. This SSB may be called a specific SSB. The indicated TCI state may be called a specific TCI state.

[0197] That TCI state may be the TCI state of the DMRS of the PDCCH / PDSCH or the common (unified) TCI state.

[0198] In the example of FIG. 13, when the UE receives a MAC CE indicating the TCI state (S10), it determines whether the QCL type D RS within that TCI state is the SSB (S20).

[0199] If the QCL type D RS within the TCI state indicated by the MAC CE is not the SSB (S20:N, the case of the aforementioned QCL source 1 (FIG. 10) and the case of option A of the aforementioned QCL source 2 (FIG. 11)), the offset time for SSB reception is applied to the delay time of the MAC CE-based TCI state switch (S30).

[0200] If the QCL type D RS within the TCI state indicated by the MAC CE is the SSB (S20:Y, the case of option B of the aforementioned QCL source 2 (FIG. 12)), the offset time for SSB reception is not applied in the delay time of the MAC CE-based TCI state switch (S40).

[0201] In the case where the offset time for SSB reception is not used in the delay time of the MAC CE-based TCI state switch, it may be limited to the case where the indicated TCI state satisfies the condition. The condition may be that the indicated TCI state is known.

[0202] Only when the QCL type D RS within the TCI state indicated by the MAC CE is SSB and the TCI state is known, the UE may update the TCI state without waiting for SSB reception. In other words, only when the QCL type D RS within the TCI state indicated by the MAC CE is SSB and the TCI state is known, in the delay time of the MAC CE-based TCI state switch, the term of the offset time for SSB reception (TO k *(T first-SSB +T SSB-proc ) / NR slot length) may not be included, or the offset time for SSB reception may be 0.

[0203] According to this embodiment, the delay from the reception to the application of the MAC CE indicating the TCI state can be reduced.

[0204] <Seventh Embodiment> <Premise> In Rel.15 / 16, SSB or CSI-RS is set as the measurement resource for L1 beam reporting. When performing L1 beam reporting using CSI-RS, even if the TCI state becomes known, the SSB is not necessarily known. When the TCI state is indicated / updated by the MAC CE, since the UE does not know whether the same spatial domain filter is used for CSI-RS and SSB, after receiving the root SSB, the UE updates the TCI state.

[0205] <Aspect> When the UE performs L1 beam reporting using the SSB, the SSB using the reported beam has been measured. If the TCI state associated with the SSB is indicated by the MAC CE, the UE may update the TCI state without waiting for the reception of the SSB. This SSB may be referred to as a specific SSB. The indicated TCI state may be referred to as a specific TCI state.

[0206] If the TCI state (e.g., QCL type D RS) indicated / updated by the MAC CE is the TCI state used by the UE for L1 beam measurement / reporting (is the RS used by the UE for L1 beam measurement / reporting), the UE may follow at least one of the following TCI state update procedures 1 and 2.

[0207] [TCI State Update Procedure 1] If the TCI state (e.g., QCL type D RS) is the SSB (is associated with the SSB), the UE may update the TCI state without waiting for the SSB reception (in the delay time of the MAC CE-based TCI state switch, the item of the offset time for SSB reception may not be included, or the offset time for SSB reception may be 0).

[0208] [TCI State Update Procedure 2] If the TCI state (e.g., QCL type D RS) is not the SSB (is not associated with the SSB), the UE may wait for the SSB reception and then update the TCI state (in the delay time of the MAC CE-based TCI state switch, the item of the offset time for SSB reception may be included, or the offset time for SSB reception may not be 0).

[0209] The measurement / reporting of the L1 beam may be the measurement / reporting of the L1-RSRP beam or the measurement / reporting of the L1-SINR beam.

[0210] In the case where the offset time for SSB reception is not used in the delay time of the MAC CE-based TCI state switch, it may be limited to the case where the indicated TCI state satisfies the condition. The condition may be that the indicated TCI state is known.

[0211] If the TCI state (QCL type D RS) updated by the MAC CE is the TCI state used by the UE for L1 beam measurement / reporting (QCL type D RS), and that TCI state is known, and the SSB is measured by the L1 beam measurement / reporting, the UE may update the TCI state without waiting for the SSB reception (in the delay time of the MAC CE-based TCI state switch, the item of the offset time for SSB reception may not be included, or the offset time for SSB reception may be 0).

[0212] According to this embodiment, based on the L1 beam report, the delay from the reception to the application of the MAC CE indicating the TCI state can be reduced.

[0213] <Eighth Embodiment> <Premise> In the common (unified) TCI state, M1 TCI states are set by the RRC IE, M2 of the M1 TCI states are activated by the MAC CE, and M3 of the M2 TCI states may be indicated by the DCI. Here, M1, M2, and M3 may be the number of DL TCIs or the number of UL and DL joint TCIs.

[0214] Similarly, N1 TCI states are set by the RRC IE, N2 of the N1 TCI states are activated by the MAC CE, and N3 of the N2 TCI states may be indicated by the DCI. Here, N1, N2, and N3 may be the number of DL TCIs or the number of UL and DL joint TCIs.

[0215] Figure 14 shows an example of the activation of joint TCI states. M1 joint TCI states are set by the RRC IE, and M2 of the M1 joint TCI states are activated by the MAC CE (M1 >= M2). The M2 joint TCI states may be referred to as an active TCI state pool, an active joint TCI state pool, etc.

[0216] Figures 15A and 15B show an example of the activation of separate TCI states. As shown in Figure 15A, N1 UL TCI states are set by the RRC IE, and N2 of the N1 UL TCI states are activated by the MAC CE (N1 >= N2). As shown in Figure 15B, M1 DL TCI states are set by the RRC IE, and M2 of the M1 DL TCI states are activated by the MAC CE (M1 >= M2). The N2 UL TCI states may be referred to as an active TCI state pool, an active UL TCI state pool, an active separate TCI state pool, etc. The M2 DL TCI states may be referred to as an active TCI state pool, an active DL TCI state pool, an active separate TCI state pool, etc.

[0217] Figure 16A shows an example of the indication of joint TCI states for a single TRP. M3 of the M2 joint TCI states are indicated by the DCI (M2 >= M3). When M3 = 1, a single joint TCI state for the single TRP is indicated. This TCI state is applied to both UL and DL.

[0218] Figure 16B shows an example of an indication of a separate TCI state for a single TRP. Among N2 UL TCI states, N3 UL TCI states (N2 >= N3) are indicated by DCI. Among M2 DL TCI states, M3 DL TCI states (M2 >= M3) are indicated by DCI. When N3 = 1 and M3 = 1, a single separate TCI state for a single TRP is indicated (one UL TCI state and one DL TCI state are indicated separately). One UL TCI state is applied to the UL. One DL TCI state is applied to the DL.

[0219] Figure 17A shows another example of an indication of a joint TCI state for multi-TRP. When M3 = 2, two joint TCI states (two sets of single joint TCI states) for two TRPs are indicated. The first joint TCI state (the first set) corresponds to the first TRP. The second joint TCI state (the second set) corresponds to the second TRP.

[0220] Figure 17B shows another example of an indication of a separate TCI state for multi-TRP. When N3 = 2 and M3 = 2, two separate TCI states (two sets of single separate TCI states) for two TRPs are indicated. The first UL TCI state (the first set) corresponds to the first TRP. The second UL TCI state (the second set) corresponds to the second TRP. The first DL TCI state (the first set) corresponds to the first TRP. The second DL TCI state (the second set) corresponds to the second TRP.

[0221] In the TCI state activation delay of Rel.15, when the PDCCH TCI state indicated by the MAC CE is included in the PDSCH active TCI state list, in the formula of the TCI state activation delay, the term of the time offset for SSB reception is not included.

[0222] "Aspect" In the common (unified) TCI state, the TCI state switching delay may vary depending on whether the TCI state indicated by the MAC CE is included in the active TCI state pool before the update. The indicated TCI state may be referred to as a specific TCI state.

[0223] [TCI State Update Procedure 1] If the TCI state indicated by the MAC CE is included in the active TCI state pool before the update, the UE may update the TCI state without waiting for the SSB reception (in the delay time of the MAC CE-based TCI state switch, the item of the offset time for SSB reception may not be included, or the offset time for SSB reception may be 0).

[0224] [TCI State Update Procedure 2] If the TCI state indicated by the MAC CE is not included in the active TCI state pool before the update, the UE may wait for the SSB reception and then update the TCI state (in the formula of the MAC-CE based TCI state switch delay, the item of the offset time for SSB reception may be included, or the offset time for SSB reception may not be 0).

[0225] Here, the TCI state indicated by the MAC CE may be part of the N2 TCI states or M2 TCI states indicated by the MAC CE, or may be all of the N2 TCI states or M2 TCI states indicated by the MAC CE.

[0226] Here, the active TCI state pool before the update may be the N2 TCI states or M2 TCI states indicated by the previous MAC CE.

[0227] The MAC CE may update the TCI state within the active TCI state pool (active joint TCI state pool, active separate TCI state pool,). The MAC CE may activate the TCI state within the active joint TCI state pool as a separate TCI state pool (DL TCI state pool or UL TCI state pool).

[0228] In the delay time of the MAC CE-based TCI state switch, the case where the offset time for SSB reception is not used may be limited to the case where the indicated TCI state meets the conditions. The condition may be that the indicated TCI state is known.

[0229] If the TCI state updated by the MAC CE is included in the active TCI state pool before the update and the TCI state is known, the UE may update the TCI state without waiting for SSB reception (in the delay time of the MAC CE-based TCI state switch, the item of the offset time for SSB reception may not be included, or the offset time for SSB reception may be 0).

[0230] According to this embodiment, the delay from the reception to the application of the MAC CE indicating the common TCI state can be reduced.

[0231] <Other embodiments> Higher layer parameters (RRC information elements) / UE capabilities corresponding to at least one function (feature) in each embodiment may be defined. The UE capability may indicate that it supports this function.

[0232] The UE in which the higher layer parameter corresponding to the function is set may perform the function. It may be defined that "the UE in which the higher layer parameter corresponding to the function is not set does not perform the function".

[0233] A UE that has reported UE capabilities indicating support for that function may perform that function. It may be specified that "a UE that has not reported UE capabilities indicating support for that function shall not perform that function".

[0234] If a UE reports UE capabilities indicating support for that function and the upper layer parameters corresponding to that function are configured, the UE may perform that function. It may be specified that "if a UE does not report UE capabilities indicating support for that function, or if the upper layer parameters corresponding to that function are not configured, the UE shall not perform that function".

[0235] For example, the UE capabilities / upper layer parameters may be specified by whether or not they support measurement / storage of QCL characteristics of one or more QCL source RSs (e.g., root SSB).

[0236] Also, for example, the UE capabilities / upper layer parameters may be specified by the number of TCI states / RSs capable of supporting measurement / storage of QCL characteristics of the QCL source RS. For example, the UE capabilities / upper layer parameters may be specified by the number X described in Embodiment 1-2-2 above.

[0237] Also, for example, the UE capabilities / upper layer parameters may be specified by whether or not they support activation of TCI states (determination of spatial domain filters) based on CSI-RS / TRS.

[0238] Also, for example, the UE capabilities / upper layer parameters may be specified by whether or not they support reporting of TCI state ID / RS ID information (e.g., a list) of known TCI states using MAC CE / UCI. Also, for example, the UE capabilities / upper layer parameters may be specified by the number of reports of TCI state ID / RS ID information (e.g., a list) of known TCI states using MAC CE / UCI.

[0239] Also, for example, the UE capability / higher layer parameter may be defined by whether it supports reporting a specific number (e.g., 4) or more of beams in beam reporting. Also, for example, the UE capability / higher layer parameter may be defined by the number of reports when reporting a specific number (e.g., 4) or more of beams in beam reporting.

[0240] Also, for example, the UE capability / higher layer parameter may be defined by whether it supports the above fifth embodiment. Also, for example, the UE capability / higher layer parameter may be defined by the number of CCs that can support the above fifth embodiment.

[0241] Also, for example, the UE capability / higher layer parameter may be defined by whether it supports aperiodic triggering / measurement / transmission of SSB using MAC CE / DCI.

[0242] Also, for example, the UE capability / higher layer parameter may be defined by whether it supports aperiodic triggering / measurement / transmission of SSB / CSI-RS related to the target TCI state by MAC CE / RRC signaling that sets / indicates TCI state switching based on MAC CE / TCI state switching based on RRC.

[0243] The UE capability may indicate whether it supports that the QCL type D source of the TCI state for PDCCH / PDSCH / common (unified) TCI directly indicates an SSB.

[0244] The UE capability may indicate whether it supports a delay time shorter than the delay time from Rel.15 / 16 in the MAC CE-based TCI state switch.

[0245] According to the above UE capabilities / higher layer parameters, the UE can implement the above functions while maintaining compatibility with existing specifications.

[0246] (Wireless communication system) Hereinafter, the configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of the present disclosure.

[0247] FIG. 18 is a diagram showing an example of the 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) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0248] Further, the wireless communication system 1 may support dual connectivity (multi-RAT dual connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs). 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.

[0249] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the Secondary Node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0250] The wireless communication system 1 may support dual connectivity between a plurality of base stations within the same RAT (for example, NR-NR Dual Connectivity (NN-DC) where both the MN and the SN are NR base stations (gNBs)).

[0251] The wireless communication system 1 may include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a - 12c) that is disposed within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and the user terminal 20 are not limited to the modes shown in the figures. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

[0252] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) and dual connectivity (DC) using a plurality of component carriers (CCs).

[0253] 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, or the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub - 6 GHz), and FR2 may be a frequency band higher than 24 GHz (above - 24 GHz). Note that the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0254] Further, the user terminal 20 may communicate using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

[0255] The plurality of base stations 10 may be connected by wire (e.g., an optical fiber compliant with Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 corresponding to the upper-level 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.

[0256] The base station 10 may be connected to the core network 30 via another base station 10 or directly. The core network 30 may include at least one of, for example, Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0257] The user terminal 20 may be a terminal corresponding to at least one of communication systems such as LTE, LTE-A, and 5G.

[0258] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access method 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.

[0259] The wireless access method may be referred to as a waveform. Note that in the wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the wireless access methods of the UL and the DL.

[0260] In the wireless communication system 1, as downlink channels, a physical downlink shared channel (PDSCH) shared by each user terminal 20, a physical broadcast channel (PBCH), a physical downlink control channel (PDCCH), etc. may be used.

[0261] Also, in the wireless communication system 1, as uplink channels, a physical uplink shared channel (PUSCH) shared by each user terminal 20, a physical uplink control channel (PUCCH), a physical random access channel (PRACH), etc. may be used.

[0262] The PDSCH is used to transmit user data, upper layer control information, System Information Block (SIB), etc. The PUSCH may be used to transmit user data, upper layer control information, etc. Also, the PBCH may be used to transmit the Master Information Block (MIB).

[0263] The PDCCH may be used to transmit lower layer control information. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information for at least one of the PDSCH and the PUSCH.

[0264] Note that the DCI for scheduling the PDSCH may be called DL assignment, DL DCI, etc., and the DCI for scheduling the PUSCH may be called UL grant, UL DCI, etc. Note that the PDSCH may be read as DL data, and the PUSCH may be read as UL data.

[0265] For the detection of the PDCCH, a control resource set (COntrol REsource SET (CORESET)) and a search space may be used. The CORESET corresponds to the resource for searching for the DCI. The search space corresponds to the search area and search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space setting.

[0266] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the "search space", "search space set", "search space configuration", "search space set configuration", "CORESET", "CORESET configuration", etc. in the present disclosure may be read interchangeably with each other.

[0267] Uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be referred to as, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) may be transmitted by PUCCH. A random access preamble for connection establishment with the cell may be transmitted by PRACH.

[0268] Note that in the present disclosure, downlink, uplink, etc. may be expressed without adding "link". Also, "physical" may be omitted from the beginning of various channels.

[0269] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may be transmitted.

[0270] The synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, an SS Block (SSB), etc. Note that SS, SSB, etc. may also be called reference signals.

[0271] Also, in the wireless communication system 1, as the uplink reference signal (Uplink Reference Signal (UL-RS)), a sounding reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. may be transmitted. Note that DMRS may also be called a UE-specific reference signal.

[0272] (Base station) FIG. 19 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 transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may be provided.

[0273] In this example, the functional blocks of the characteristic portions in 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.

[0274] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0275] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission / reception, measurement, etc., using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140. The control unit 110 may generate data, control information, a sequence, etc., to be transmitted as signals, and transfer them to the transmission / reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of radio resources, etc.

[0276] The transmission / reception 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 transmission / reception unit 120 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0277] The transmission / reception unit 120 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122. The reception unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0278] The transmission / reception antenna 130 can be composed of an antenna described based on the common understanding in the technical field related to the present disclosure, such as an array antenna.

[0279] The transmission / reception unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmission / reception unit 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0280] The transmission / reception unit 120 may form at least one of a transmission beam and a reception beam by using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0281] The transmission / reception unit 120 (transmission processing unit 1211) may perform processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (e.g., RLC retransmission control), processing of the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc. on, for example, data and control information obtained from the control unit 110, and generate a bit string to be transmitted.

[0282] The transmission / reception unit 120 (transmission processing unit 1211) may perform transmission processing such as channel encoding (which may include error correction encoding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-to-analog conversion, etc. on the bit sequence to be transmitted, and output a baseband signal.

[0283] The transmission / reception unit 120 (RF unit 122) may perform modulation to the radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0284] On the other hand, the transmission / reception unit 120 (RF unit 122) may perform amplification, filtering, demodulation to the baseband signal, etc. on the radio frequency band signal received by the transmission / reception antenna 130.

[0285] The transmission / reception unit 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, etc. on the acquired baseband signal, and acquire user data, etc.

[0286] The transmission / reception unit 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.

[0287] The transmission path interface 140 may transmit and receive signals (backhaul signaling) with devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0288] Note that the transmission unit and reception unit of the base station 10 in the present disclosure may be configured by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0289] The transmission / reception unit 120 may transmit a medium access control-control element (MAC CE) indicating information regarding the transmission configuration indication (TCI) state. The control unit 110 may determine the timing for applying the TCI state to at least one of reception and transmission based on whether the TCI state is associated with a specific synchronization signal block or a specific TCI state.

[0290] (User Terminal) FIG. 20 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 transmission / reception unit 220, and a transmission / reception antenna 230. Note that one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided.

[0291] Note that in this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

[0292] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0293] 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.

[0294] The transmission / reception 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 transmission / reception unit 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0295] The transmission / reception unit 220 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of the transmission processing unit 2211 and the RF unit 222. The reception unit may be composed of the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0296] The transmission / reception antenna 230 can be composed of an antenna described based on the common recognition in the technical field related to the present disclosure, such as an array antenna or the like.

[0297] The transmission / reception unit 220 may receive the above-described downlink channel, synchronization signal, downlink reference signal, etc. The transmission / reception unit 220 may transmit the above-described uplink channel, uplink reference signal, etc.

[0298] The transmission / reception unit 220 may form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0299] The transmission / reception unit 220 (transmission processing unit 2211) may perform processing of the PDCP layer, processing of the RLC layer (e.g., RLC retransmission control), processing of the MAC layer (e.g., HARQ retransmission control), etc. on, for example, data and control information obtained from the control unit 210, and generate a bit sequence to be transmitted.

[0300] The transmission / reception unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit sequence to be transmitted, and output a baseband signal.

[0301] Note that whether to apply DFT processing may be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is enabled, the transmission / reception unit 220 (transmission processing unit 2211) may perform DFT processing as the above-described transmission processing to transmit the channel using the DFT-s-OFDM waveform, or if not, it may not perform DFT processing as the above-described transmission processing.

[0302] The transmission / reception unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the signal in the radio frequency band via the transmission / reception antenna 230.

[0303] On the other hand, the transmission / reception unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmission / reception antenna 230.

[0304] The transmission / reception unit 220 (reception processing unit 2212) may apply reception processing such as analog-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.

[0305] The transmission / reception unit 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), reception 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.

[0306] Note that the transmission unit and reception unit of the user terminal 20 in the present disclosure may be constituted by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0307] The transmitting and receiving unit 220 may receive a medium access control - control element (MAC CE) indicating information regarding a transmission configuration indication (TCI) state. The control unit 210 may determine the timing for applying the TCI state to at least one of reception and transmission based on whether the TCI state is associated with a specific synchronization signal block or a specific TCI state.

[0308] When the quasi co - location (QCL) type D reference signal within the TCI state is the specific synchronization signal block, the control unit 210 may not include the second time for receiving the synchronization signal block within the first time from the reception of the MAC CE to the application of the TCI state.

[0309] The specific synchronization signal block may be a synchronization signal block measured by layer 1 beam reporting.

[0310] The TCI state may be applied to a plurality of types of channels. The specific TCI state may be the active TCI state before the application of the TCI state.

[0311] (Hardware Configuration) Note that the block diagrams used in the description of the above - mentioned embodiments show blocks of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or may be realized using two or more physically or logically separated devices directly or indirectly (for example, using wired, wireless, etc.) connected, and using these multiple devices. The functional block may be realized by combining software with the above - mentioned one device or the above - mentioned multiple devices.

[0312] Here, functions include, but are not limited to, judgment, decision-making, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection determination, establishment, comparison, assumption, expectation, regarded as, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), assigning, etc. For example, a functional block (component) that enables transmission may be referred to as a transmitting unit, a transmitter, etc. In any case, as described above, the implementation method is not particularly limited.

[0313] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 21 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may physically be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0314] Note that in the present disclosure, terms such as device, circuit, device, section, unit, etc. can be read interchangeably with each other. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[0315] For example, although only one processor 1001 is shown in the figure, there may be a plurality of processors. Also, the processing may be executed by one processor, or the processing may be executed by two or more processors simultaneously, sequentially, or using other methods. Note that the processor 1001 may be implemented by one or more chips.

[0316] Each function in the base station 10 and the user terminal 20 is realized, for example, by causing a predetermined software (program) to be loaded onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communication via the communication device 1004, or controls at least one of reading and writing data in the memory 1002 and the storage 1003.

[0317] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, at least a part of the above-described control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0318] Also, the processor 1001 reads a program (program code), software module, 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 these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and the same may be true for other functional blocks.

[0319] The memory 1002 is a computer-readable recording medium and may be constituted by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store a program (program code), a software module, etc. executable for implementing the wireless communication method according to an embodiment of the present disclosure.

[0320] The storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (e.g., a compact disc (Compact Disc ROM (CD-ROM), etc.), a digital versatile disc, a Blu-ray (registered trademark) disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other suitable storage media. The storage 1003 may be referred to as an auxiliary storage device.

[0321] The communication device 1004 is hardware (a transceiver device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-described transceiver unit 120 (220), transceiver antenna 130 (230), etc. may be implemented by the communication device 1004. The transceiver unit 120 (220) may be physically or logically separated and implemented by a transmitter unit 120a (220a) and a receiver unit 120b (220b).

[0322] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an external input. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs an output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (e.g., a touch panel).

[0323] Also, 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 for each device.

[0324] In addition, 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), and a Field Programmable Gate Array (FPGA), 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 hardware components.

[0325] (Modification example) In addition, for the terms described in this disclosure and the terms necessary for understanding this disclosure, they may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be read interchangeably with each other. Also, a signal may be a message. A reference signal may also be abbreviated as RS and may be called a Pilot, a pilot signal, etc. depending on the applicable standard. Also, a Component Carrier (CC) may be called a cell, a frequency carrier, a carrier frequency, etc.

[0326] The radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may be called a subframe. Further, the subframe may be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) that does not depend on numerology.

[0327] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The numerology may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering process performed by a transceiver in the frequency domain, specific windowing process performed by a transceiver in the time domain, etc.

[0328] A slot may be composed of one or more symbols (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. Also, a slot may be a time unit based on numerology.

[0329] A slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, a mini-slot may be called a sub-slot. A mini-slot may be composed of a smaller number of symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called PDSCH (PUSCH) mapping type B.

[0330] A radio frame, sub-frame, slot, mini-slot, and symbol all represent time units when transmitting signals. For a radio frame, sub-frame, slot, mini-slot, and symbol, other corresponding names may be used. Note that the time units such as frame, sub-frame, slot, mini-slot, and symbol in this disclosure may be read interchangeably with each other.

[0331] For example, one sub-frame may be called a TTI, or a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the sub-frame and the TTI may be the sub-frame (1 ms) in the existing LTE, or may be a period shorter than 1 ms (for example, 1 - 13 symbols), or may be a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, mini-slot, etc. instead of a sub-frame.

[0332] Here, the TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in an LTE system, the base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI. Note that the definition of the TTI is not limited to this.

[0333] The TTI may be a transmission time unit such as a channel-encoded data packet (transport block), code block, codeword, etc., or may be a processing unit such as scheduling and link adaptation. Note that when the TTI is given, the time interval (for example, the number of symbols) in which the transport block, code block, codeword, etc. are actually mapped may be shorter than the TTI.

[0334] When one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (mini-slots) constituting the minimum time unit for the scheduling may be controlled.

[0335] A TTI having a time length of 1 ms may be referred to as 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 referred to as a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0336] Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of the long TTI and not less than 1 ms.

[0337] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or a plurality of consecutive subcarriers. The number of subcarriers included in the RB may be the same regardless of the numerology, for example, it may be 12. The number of subcarriers included in the RB may be determined based on the numerology.

[0338] Also, the RB may include one or a plurality of symbols in the time domain, and may be the length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. may each be constituted by one or a plurality of resource blocks.

[0339] One or more RBs may be referred to as a Physical Resource Block (PRB), a Sub-Carrier Group (SCG), a Resource Element Group (REG), a PRB pair, an RB pair, etc.

[0340] Also, a resource block may be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource region of 1 sub-carrier and 1 symbol.

[0341] A Bandwidth Part (BWP) (which may also be referred to as a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. The PRB is defined in a certain BWP and may be numbered within the BWP.

[0342] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be set within one carrier for a UE.

[0343] At least one of the set BWPs may be active, and the UE may not be assumed to transmit and receive a predetermined signal / channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

[0344] Note that the structures such as the above-described radio frame, subframe, slot, minislot, and symbol 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, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be changed in various ways.

[0345] Also, the information, parameters, etc. described in the present disclosure may be represented using absolute values, relative values from a predetermined value, or corresponding other information. For example, a radio resource may be indicated by a predetermined index.

[0346] The names used for parameters, etc. in the present disclosure are not limiting names in any way. Furthermore, mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Since various channels (such as PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting names in any way.

[0347] The information, signals, etc. described in the present disclosure may be represented using any of various different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0348] Also, information, signals, etc. may be output from at least one of the upper layer to the lower layer and from the lower layer to the upper layer. Information, signals, etc. may be input and output via a plurality of network nodes.

[0349] The input / output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. The information, signals, etc. to be input / output may be overwritten, updated, or appended. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.

[0350] The notification of information is not limited to the aspects / embodiments described in this disclosure and may be performed using other methods. For example, the notification of information in this disclosure may be implemented by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or combinations thereof.

[0351] Note that physical layer signaling may also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Also, RRC signaling may also be referred to as an RRC message and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. Also, MAC signaling may be notified, for example, using a MAC Control Element (CE).

[0352] Also, the notification of predetermined information (e.g., the notification of "being X") is not limited to explicit notification and may be performed implicitly (e.g., by not performing the notification of the predetermined information or by the notification of another piece of information).

[0353] The determination may be made based on a value represented by 1 bit (either 0 or 1), a boolean value represented by true or false, or a numerical comparison (e.g., comparison with a predetermined value).

[0354] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, a hardware description language, or by some other name.

[0355] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of the transmission medium.

[0356] The terms "system" and "network" used in the present disclosure may be used interchangeably. "Network" may mean the devices (e.g., base stations) included in the network.

[0357] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" may be used interchangeably.

[0358] In the present disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. The base station may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0359] A base station can accommodate one or more (e.g., three) cells. When the base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each of the smaller areas can also provide communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services in this coverage.

[0360] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" can be used interchangeably.

[0361] A mobile station may also be called a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable term.

[0362] 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. Note that 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.), a moving body that moves without a driver (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or non-humanoid). Note that at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0363] Also, the base station in the present disclosure may be replaced by a user terminal. For example, for a configuration in which communication between the base station and the user terminal is replaced by communication between a plurality of user terminals (which may be referred to as, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the above-described base station 10 may be configured to be functions of the user terminal 20. Also, terms such as "uplink" and "downlink" may be replaced with terms corresponding to communication between terminals (for example, "sidelink"). For example, an uplink channel, a downlink channel, etc. may be replaced with a sidelink channel.

[0364] Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the functions of the above-described user terminal 20 may be configured to be functions of the base station 10.

[0365] In the present disclosure, operations assumed to be performed by the base station may, in some cases, be performed by its upper node. In a network including one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME), Serving-Gateway (S-GW), etc., but not limited thereto), or a combination thereof.

[0366] Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched and used during execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, for the method described in the present disclosure, elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0367] Each aspect / embodiment described in the present disclosure may be applicable to systems using 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) (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 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other suitable wireless communication methods, and next-generation systems extended based on these. Further, a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G) may be applicable.

[0368] The description "based on" used in the present disclosure does not mean "only based on" unless otherwise specified. In other words, the description "based on" means both "only based on" and "at least based on".

[0369] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not generally limit the quantity or order of those elements. These terms can be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be employed or that the first element must precede the second element in any way.

[0370] The term "determining" as used in this disclosure may encompass a wide variety of operations. For example, "determining" may be considered to be "judging", "calculating", "computing", "processing", "deriving", "investigating", "looking up, search, inquiry" (e.g., searching in a table, database, or another data structure), "ascertaining", etc.

[0371] Also, "determining" may be considered to be "receiving" (e.g., receiving information), "transmitting" (e.g., transmitting information), "input", "output", "accessing" (e.g., accessing data in a memory), etc.

[0372] Also, "determining" may be considered to be "resolving", "selecting", "choosing", "establishing", "comparing", etc. That is, "determining" may be considered to be "determining" some operation.

[0373] Also, "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

[0374] The "maximum transmit power" described in this disclosure may mean the maximum value of the transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0375] As used in this disclosure, the terms "connected" and "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed".

[0376] In this disclosure, when two elements are connected, they can be considered to be "connected" or "coupled" to each other using one or more wires, cables, printed electrical connections, etc., and also, as some non-limiting and non-exhaustive examples, using electromagnetic energy having wavelengths in the radio frequency region, microwave region, optical (both visible and invisible) region, etc.

[0377] In this disclosure, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are each different from C". Terms such as "separate" and "coupled" may also be interpreted in the same way as "different".

[0378] In the present disclosure, when the terms "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Further, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

[0379] In the present disclosure, for example, when articles are added by translation, such as a, an and the in English, the present disclosure may include that the nouns following these articles are in the plural form.

[0380] As described above, the invention according to the present disclosure has been described in detail. However, it is obvious to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and changed forms without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not bring any restrictive meaning to the invention according to the present disclosure.

Claims

A receiving unit that receives a Medium Access Control - Control Element (MAC CE) indicating information related to a Transmission Configuration Indication (TCI) state; A control unit that determines a timing for applying the TCI state to at least one of reception and transmission so as not to include a second time for reception of a Synchronization Signal Block (SSB) in a first time from reception of the MAC CE to application of the TCI state when a Quasi-Co-Location (QCL) type D reference signal in the TCI state is a specific Synchronization Signal Block (SSB); The TCI state is determined from a common TCI state for a plurality of cells, and the TCI state includes the specific SSB and a CSI - RS (Tracking Reference Signal (TRS)) for tracking of QCL type A; A terminal in which, within a TCI state of a demodulation reference signal (DeModulation Reference Signal (DMRS)) for a Physical Downlink Control Channel (PDCCH) of each of the plurality of cells, a QCL type A reference signal is a TRS of the same cell and a QCL type D reference signal is an SSB of a special cell included in the plurality of cells. A step of receiving a Medium Access Control - Control Element (MAC CE) indicating information related to a Transmission Configuration Indication (TCI) state; A step of determining a timing for applying the TCI state to at least one of reception and transmission so as not to include a second time for reception of a Synchronization Signal Block (SSB) in a first time from reception of the MAC CE to application of the TCI state when a Quasi-Co-Location (QCL) type D reference signal in the TCI state is a specific Synchronization Signal Block (SSB); The TCI state is determined from a common TCI state for a plurality of cells, and the TCI state includes the specific SSB and a CSI-RS (Tracking Reference Signal (TRS)) for tracking of QCL type A. A wireless communication method for a terminal, in which, within the TCI state of a demodulation reference signal (DeModulation Reference Signal (DMRS)) for a physical downlink control channel (Physical Downlink Control Channel (PDCCH)) of each of the plurality of cells, the QCL type A reference signal is a TRS of the same cell, and the QCL type D reference signal is an SSB of a special cell included in the plurality of cells.

3. A transmitting unit that transmits a Medium Access Control-Control Element (MAC CE) indicating information related to a Transmission Configuration Indication (TCI) state. A control unit that determines a timing for applying the TCI state to at least one of reception and transmission so as not to include a second time for reception of an SSB in a first time from reception of the MAC CE to application of the TCI state when a Quasi-Co-Location (QCL) type D reference signal in the TCI state is a specific synchronization signal block (Synchronization Signal Block (SSB)). The TCI state is determined from a common TCI state for a plurality of cells, and the TCI state includes the specific SSB and a CSI-RS (Tracking Reference Signal (TRS)) for tracking of QCL type A. A base station, in which, within the TCI state of a demodulation reference signal (DeModulation Reference Signal (DMRS)) for a physical downlink control channel (Physical Downlink Control Channel (PDCCH)) of each of the plurality of cells, the QCL type A reference signal is a TRS of the same cell, and the QCL type D reference signal is an SSB of a special cell included in the plurality of cells.

4. A system having a terminal and a base station. The terminal is A receiving unit that receives a Medium Access Control- Control Element (MAC CE) indicating information related to a Transmission Configuration Indication (TCI) state; A control unit that determines a timing for applying the TCI state to at least one of reception and transmission so as not to include a second time for reception of a Synchronization Signal Block (SSB) in a first time from reception of the MAC CE to application of the TCI state when a Quasi-Co-Location (QCL) type D reference signal in the TCI state is a specific Synchronization Signal Block (SSB); The TCI state is determined from a common TCI state for a plurality of cells, and the TCI state includes the specific SSB and a CSI-RS (Tracking Reference Signal (TRS)) for tracking of QCL type A; In a TCI state of a Demodulation Reference Signal (DMRS) for demodulation of a Physical Downlink Control Channel (PDCCH) of each of the plurality of cells, a QCL type A reference signal is a TRS of the same cell, and a QCL type D reference signal is an SSB of a special cell included in the plurality of cells; The base station, A system having a transmitting unit that transmits the MAC CE.

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