Terminal, wireless communication method and base station

Abstract

A terminal according to one aspect of the present disclosure is provided with: a reception unit that receives one or more information elements for setting a periodic channel state information-reference signal (CSI-RS); and a control unit that controls reception of a medium access control-control element (MAC CE) including one or more bits. The one or more bits respectively correspond to the one or more information elements. The one or more bits each represent activation or deactivation of a corresponding one of the information elements. The one or more information elements each represent a CSI-RS resource or a CSI-RS resource set. According to one aspect of the present disclosure, it is possible to efficiently use a P-CSI-RS resource.

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 technology]

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

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

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

[0005] In future wireless communication systems (e.g., NR), it is being considered that user terminals (terminals, user terminals, User Equipment (UE)) will control transmission and reception processing based on information regarding quasi-co-location (QCL).

[0006] However, if a large number of periodic channel state information-reference signals (P-CSI-RS) are configured to manage a large number of beams, the resource utilization efficiency may decrease, which may result in a decrease in throughput.

[0007] Therefore, an object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that efficiently utilize P-CSI-RS resources. [Means for solving the problem]

[0008] A terminal according to one embodiment of the present disclosure includes a receiving unit that receives one or more information elements for periodic channel state information-reference signal (CSI-RS) configuration, and a control unit that controls reception of a medium access control-control element (MAC CE) including one or more bits, the one or more bits corresponding to the one or more information elements, each of the one or more bits indicating activation or deactivation of a corresponding information element, and each of the one or more information elements indicating either a CSI-RS resource or a CSI-RS resource set. The MAC CE includes the one or more IDs, each of which indicates the one or more information elements, and the MAC CE includes one or more TCI states, each of which corresponds to the one or more information elements. . Effect of the Invention

[0009] According to one aspect of the present disclosure, P-CSI-RS resources can be utilized efficiently. [Brief description of the drawings]

[0010] [Figure 1] 1A and 1B are diagrams illustrating an example of a MAC CE of option 1 in the first embodiment. [Diagram 2] 2A and 2B are diagrams illustrating an example of a MAC CE for option 2 in the first embodiment. [Diagram 3] FIG. 3 is a diagram illustrating an example of a MAC CE according to a modification of the first embodiment. [Figure 4] FIG. 4 is a diagram illustrating an example of a MAC CE according to another modified example of the first embodiment. [Diagram 5] 5A and 5B are diagrams illustrating an example of a MAC CE for option 1 in the second embodiment. [Figure 6] 6A and 6B are diagrams illustrating an example of a MAC CE for option 2 in the second embodiment. [Figure 7] 7A to 7C are diagrams illustrating an example of MAC CE for options 3 to 5 in the second embodiment. [Figure 8] 8A and 8B are diagrams illustrating an example of a MAC CE for option 1 in the third embodiment. [Figure 9] 9A and 9B are diagrams illustrating an example of a MAC CE for option 2 in the third embodiment. [Figure 10] 10A and 10B are diagrams illustrating an example of a MAC CE according to a modified example of the third embodiment. [Figure 11] 11A and 11B are diagrams illustrating an example of a MAC CE according to another modified example of the third embodiment. [Figure 12] 12A and 12B are diagrams illustrating an example of the operation of multiple UEs. [Figure 13] 13A and 13B are diagrams illustrating an example of scheduling restrictions. [Figure 14] FIG. 14 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 15] FIG. 15 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 16] FIG. 16 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 17] FIG. 17 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (TCI, spatial relations, QCL) In NR, it is considered to control reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) in a UE of at least one of a signal and a channel (referred to as a signal / channel) based on a transmission configuration indication state (TCI state).

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

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

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

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

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

[0017] The UE's assumption that a Control Resource Set (CORESET), channel, or reference signal is in a specific QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be referred to as a QCL assumption.

[0018] The UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal / channel based on the TCI condition or QCL assumptions of the signal / channel.

[0019] The TCI state may be, for example, information about the QCL of the channel of interest (in other words, the Reference Signal (RS) for that channel) and another signal (e.g., another RS). The TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination of these.

[0020] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0021] The channel for which the TCI state or spatial relationship 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)).

[0022] In addition, the RS that has a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a sounding reference signal (SRS), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).

[0023] An SSB is a signal block including at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). An SSB may be referred to as an SS / PBCH block.

[0024] An RS of QCL type X in a TCI state may refer to an RS that has a QCL type X relationship with a certain channel / signal (its DMRS), and this RS may be called a QCL source of QCL type X in the TCI state.

[0025] (Pathloss RS) Path loss PL for each transmission power control of PUSCH, PUCCH, and SRS b,f,c (q d ) [dB] is the index q of the reference signal (RS, Pathloss Reference RS) for the downlink BWP associated with the active UL BWP b of the carrier f of the serving cell c d In this disclosure, the path loss reference RS, pathloss(PL)-RS, and index q d, an RS used in a path loss calculation, and an RS resource used in a path loss calculation may be interpreted as interchangeable. In the present disclosure, the terms calculate, estimate, measure, and track may be interpreted as interchangeable.

[0026] It is under consideration whether to modify the existing mechanism of higher layer filtered RSRP for path loss measurement when the path loss RS is updated by the MAC CE.

[0027] When the pathloss RS is updated by the MAC CE, the pathloss measurement based on L1-RSRP may be applied. At an available timing after the MAC CE for updating the pathloss RS, the upper layer filter RSRP may be used for the pathloss measurement, and the L1-RSRP may be used for the pathloss measurement before the upper layer filter RSRP is applied. At an available timing after the MAC CE for updating the pathloss RS, the upper layer filter RSRP may be used for the pathloss measurement, and before that timing, the upper layer filter RSRP of the previous pathloss RS may be used. Similar to the operation of Rel. 15, the upper layer filter RSRP may be used for the pathloss measurement, and the UE may track all pathloss RS candidates configured by the RRC. The maximum number of pathloss RSs configurable by the RRC may depend on the UE capability. If the maximum number of pathloss RSs configurable by the RRC is X, X or less pathloss RS candidates may be configured by the RRC, and the pathloss RS may be selected by the MAC CE from among the configured pathloss RS candidates. The maximum number of pathloss RSs configurable by the RRC may be 4, 8, 16, 64, etc.

[0028] In this disclosure, upper layer filtered RSRP, filtered RSRP, and layer 3 filtered RSRP may be interpreted as interchangeable.

[0029] (default TCI state / default spatial relationship / default PL-RS) In the RRC connected mode, in both cases where the TCI information in DCI (higher layer parameter TCI-PresentInDCI) is set to "enabled" and where the TCI information in DCI is not set, if the time offset between the reception of DL DCI (DCI that schedules PDSCH) and the corresponding PDSCH (PDSCH scheduled by the DCI) is smaller than a threshold (timeDurationForQCL) (applicable condition, first condition), in the case of non-cross-carrier scheduling, the TCI state of the PDSCH (default TCI state) may be the TCI state of the lowest CORESET ID in the latest slot in the active DL BWP of the CC (of the specific UL signal). Otherwise, the TCI state of the PDSCH (default TCI state) may be the TCI state of the lowest TCI state ID of the PDSCH in the active DL BWP of the scheduled CC.

[0030] In Rel.15, separate MAC CEs are required for activation / deactivation of PUCCH spatial relation and activation / deactivation of SRS spatial relation. PUSCH spatial relation follows SRS spatial relation.

[0031] In Rel.16, at least one of the MAC CE for activation / deactivation of the PUCCH spatial relationship and the MAC CE for activation / deactivation of the SRS spatial relationship may not be used.

[0032] If neither the spatial relationship nor the PL-RS for the PUCCH is configured in FR2 (applicable condition, second condition), the default assumptions of the spatial relationship and the PL-RS for the PUCCH (default spatial relationship and default PL-RS) are applied. If neither the spatial relationship nor the PL-RS for the SRS (SRS resource for the SRS, or SRS resource corresponding to the SRI in DCI format 0_1 ​​that schedules the PUSCH) is configured in FR2 (applicable condition, second condition), the default assumptions of the spatial relationship and the PL-RS for the PUSCH and the SRS scheduled by DCI format 0_1 ​​(default spatial relationship and default PL-RS) are applied.

[0033] If a CORESET is configured in an active DL BWP on that CC, the default spatial relationship and default PL-RS may be the TCI state or QCL assumption of the CORESET with the lowest CORESET ID in that active DL BWP. If a CORESET is not configured in an active DL BWP on that CC, the default spatial relationship and default PL-RS may be the active TCI state with the lowest PDSCH ID in that active DL BWP.

[0034] In Rel.15, the spatial relationship of PUSCH scheduled by DCI format 0_0 follows the spatial relationship of the PUCCH resource with the lowest PUCCH resource ID among the active spatial relationships of PUCCH on the same CC. The network needs to update the PUCCH spatial relationship on all SCells even if no PUCCH is transmitted on the SCell.

[0035] In Rel.16, PUCCH configuration is not required for a PUSCH scheduled by DCI format 0_0. If there is no active PUCCH spatial relationship or no PUCCH resource on the active UL BWP in the CC for a PUSCH scheduled by DCI format 0_0 (applicable condition, second condition), the default spatial relationship and default PL-RS are applied to the PUSCH.

[0036] The condition under which the default spatial relationship / default PL-RS for SRS is applied may include a default beam path loss enable information element for SRS (upper layer parameter enableDefaultBeamPlForSRS) being set to valid. The condition under which the default spatial relationship / default PL-RS for PUCCH is applied may include a default beam path loss enable information element for PUCCH (upper layer parameter enableDefaultBeamPlForPUCCH) being set to valid. The condition under which the default spatial relationship / default PL-RS for PUSCH scheduled by DCI format 0_0 is applied may include a default beam path loss enable information element for PUSCH scheduled by DCI format 0_0 (upper layer parameter enableDefaultBeamPlForPUSCH0_0) being set to valid.

[0037] The above threshold may also be referred to as time duration for QCL, "timeDurationForQCL", "Threshold", "Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI", "Threshold-Sched-Offset", schedule offset threshold, scheduling offset threshold, etc.

[0038] (CSI) In NR, a UE measures a channel state using a reference signal (or a resource for the reference signal) and feeds back (reports) channel state information (CSI) to a network (e.g., a base station).

[0039] The UE may measure the channel state using at least one of a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Synchronization Signal (SS), a DeModulation Reference Signal (DMRS), etc.

[0040] The CSI-RS resources may include at least one of a Non Zero Power (NZP) CSI-RS resource, a Zero Power (ZP) CSI-RS resource, and a CSI Interference Measurement (CSI-IM) resource.

[0041] The resource for measuring the signal component for CSI may be referred to as a Signal Measurement Resource (SMR) or a Channel Measurement Resource (CMR). The SMR (CMR) may include, for example, NZP CSI-RS resources, SSB, etc. for channel measurement.

[0042] A resource for measuring an interference component for CSI may be referred to as an interference measurement resource (IMR). The IMR may include, for example, at least one of a NZP CSI-RS resource, an SSB, a ZP CSI-RS resource, and a CSI-IM resource for interference measurement.

[0043] An SS / PBCH block is a block that includes a synchronization signal (e.g., a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS)) and a PBCH (and corresponding DMRS), and may also be referred to as an SS block (SSB), etc.

[0044] In addition, the CSI may include at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), a SS / PBCH Block Resource Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), L1-RSRP (Layer 1 Reference Signal Received Power), L1-RSRQ (Reference Signal Received Quality), L1-SINR (Signal to Interference plus Noise Ratio), and L1-SNR (Signal to Noise Ratio).

[0045] The CSI may have multiple parts. CSI Part 1 may include information with a relatively small number of bits (e.g., RI). CSI Part 2 may include information with a relatively large number of bits (e.g., CQI), such as information determined based on CSI Part 1.

[0046] Furthermore, CSI may be classified into several CSI types. The type and size of information to be reported may differ depending on the CSI type. For example, a CSI type set for communication using a single beam (also called type I CSI, CSI for single beam, etc.) and a CSI type set for communication using multiple beams (also called type II CSI, CSI for multiple beams, etc.) may be specified. The use of the CSI types is not limited to this.

[0047] Methods of CSI feedback under consideration include periodic CSI (P-CSI) reporting, aperiodic CSI (A-CSI, AP-CSI) reporting, and semi-persistent CSI (SP-CSI) reporting.

[0048] The UE may be notified of the CSI measurement configuration information using higher layer signaling, physical layer signaling, or a combination thereof.

[0049] In the present disclosure, higher layer signaling may be, for example, any one or a combination of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like.

[0050] The MAC signaling may be, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0051] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0052] The CSI measurement configuration information may be configured, for example, using the RRC information element "CSI-MeasConfig". The CSI measurement configuration information may include CSI resource configuration information (RRC information element "CSI-ResourceConfig"), CSI reporting configuration information (RRC information element "CSI-ReportConfig"), etc. The CSI resource configuration information relates to resources for CSI measurement, and the CSI reporting configuration information relates to how the UE performs CSI reporting.

[0053] The RRC information elements (or RRC parameters) related to the CSI reporting configuration and the CSI resource configuration will be described.

[0054] The CSI reporting configuration information ("CSI-ReportConfig") includes resource information for channel measurement ("resourcesForChannelMeasurement"). The CSI reporting configuration information may also include resource information for interference measurement (e.g., NZP CSI-RS resource information for interference measurement ("nzp-CSI-RS-ResourcesForInterference"), CSI-IM resource information for interference measurement ("csi-IM-ResourcesForInterference"), etc.). These pieces of resource information correspond to the ID (Identifier) ​​of the CSI resource configuration information ("CSI-ResourceConfigId").

[0055] Note that the IDs of the CSI resource configuration information corresponding to each piece of resource information (which may be referred to as CSI resource configuration IDs) may be one or more of the same value, or may each have a different value.

[0056] The CSI resource configuration information ("CSI-ResourceConfig") may include a CSI resource configuration information ID, CSI-RS resource set list information ("csi-RS-ResourceSetList"), a resource type ("resourceType"), etc. The CSI-RS resource set list may include at least one of NZP CSI-RS and SSB information for measurement ("nzp-CSI-RS-SSB") and CSI-IM resource set list information ("csi-IM-ResourceSetList").

[0057] The resource type indicates the time domain behavior of the resource configuration, and may be set to "aperiodic," "semi-persistent," or "periodic." For example, the corresponding CSI-RS may be referred to as A-CSI-RS (AP-CSI-RS), SP-CSI-RS, or P-CSI-RS.

[0058] The channel measurement resources may be used to calculate, for example, CQI, PMI, L1-RSRP, etc. The interference measurement resources may be used to calculate L1-SINR, L1-SNR, L1-RSRQ, and other indices related to interference.

[0059] (Simultaneous beam update of multiple CCs) In Rel.16, one MAC CE can update the beam index (TCI state) of multiple CCs.

[0060] The UE may be configured by the RRC with up to two applicable CC lists (e.g., applicable-CC-list). When two applicable CC lists are configured, the two applicable CC lists may correspond to in-band CA in FR1 and in-band CA in FR2, respectively.

[0061] Activation of TCI states on PDCCH The MAC CE activates the TCI states associated with the same CORESET ID on all BWP / CCs in the applicable CC list.

[0062] Activation of the TCI state for the PDSCH The MAC CE activates the TCI state on all BWP / CCs in the applicable CC list.

[0063] A-SRS / SP-SRS Spatial Relationship Activation The MAC CE activates the spatial relationships associated with the same SRS resource ID on all BWPs / CCs in the applicable CC list.

[0064] (Beam Management) In DL / UL beam management, more efficient beam management, such as lower latency and lower overhead, is being considered.

[0065] The QCL assumption / TCI state of the periodic CSI-RS (P-CSI-RS) (e.g., information element qcl-InfoPeriodicCSI-RS(TCI-StateId)) is configured via RRC signaling (e.g., information element NZP-CSI-RS-Resource). The existing P-CSI-RS continues to be transmitted with the configured TCI state.

[0066] For optimal management of all beams, a large number of P-CSI-RSs may be configured. If a small number of P-CSI-RSs are configured, RRC reconfiguration of the QCL assumptions / TCI state of the P-CSI-RSs would be required to support management of a large number of beams, which is inefficient.

[0067] If multiple P-CSI-RS are configured for optimal beam management, then after beam management, multiple P-CSI-RS are not needed, and only a few P-CSI-RS are needed for the UE, in which case frequent RRC reconfiguration is required to change the CSI-RS, which is not efficient.

[0068] Therefore, the present inventors have come up with a method of appropriately changing the P-CSI-RS to be used.

[0069] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The configurations described in each embodiment may be applied alone or in combination.

[0070] In the present disclosure, "A / B" and "at least one of A and B" may be read as interchangeable. In the present disclosure, cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read as interchangeable. In the present disclosure, index, ID, indicator, and resource ID may be read as interchangeable. In the present disclosure, RRC parameter, higher layer parameter, RRC information element (IE), and RRC message may be read as interchangeable. In the present disclosure, support, control, can be controlled, operate, and can operate may be read as interchangeable.

[0071] In the present disclosure, the terms activate, update, indicate, enable, and specify may be read as interchangeable.

[0072] In the present disclosure, MAC CE and activation / deactivation command may be read as interchangeable.

[0073] In the present disclosure, higher layer signaling may be, for example, any one or a combination of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like.

[0074] The MAC signaling may be, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0075] In the present disclosure, beam, spatial domain filter, TCI state, 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, QCL type D in TCI state, RS for QCL type D in TCI state, RS for QCL type D in TCI state or QCL assumption, RS for QCL type A in TCI state or QCL assumption, spatial relationship, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder may be read as interchangeable. In the present disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type X, source of DL-RS, SSB, CSI-RS may be read as interchangeable.

[0076] In the present disclosure, the following terms may be used interchangeably: CC list, cell list, applicable list, simultaneous TCI update list, simultaneousTCI-UpdateList-r16 / simultaneousTCI-UpdateListSecond-r16, simultaneous TCI cell list, simultaneousTCI-CellList, simultaneous spatial update list, simultaneousSpatial-UpdateList-r16 / simultaneousSpatial-UpdateListSecond-r16, simultaneousSpatial-UpdatedList-r16 / simultaneousSpatial-UpdatedListSecond-r16, configured CC, configured list, BWP / CC in the configured list, all BWP / CC in the configured list, CC indicated by the activation command, indicated CC, CC that received MAC CE, and information indicating multiple cells for updating at least one of TCI state and spatial relationship.

[0077] In this disclosure, P-CSI-RS, CSI-RS, and NZP-CSI-RS may be interchangeable. In this disclosure, CSI-RS resources, CSI-RS resource sets, CSI-RS resource groups, and information elements (IEs) may be interchangeable.

[0078] (Wireless communication method) <First embodiment> The UE may support the TCI state / QCL assumption of the P-CSI-RS being updated by the new MAC CE.

[0079] The MAC CE may include one TCI state for a CSI-RS resource ID of one P-CSI-RS (non-zero power (NZP)-CSI-RS), or for a CSI-RS resource ID of multiple P-CSI-RS (NZP-CSI-RS), or for a CSI-RS resource set ID (CSI-RS resource group ID) of one P-CSI-RS (NZP-CSI-RS), or for a CSI-RS resource set ID (CSI-RS resource group ID) of multiple P-CSI-RS (NZP-CSI-RS).

[0080] The MAC CE may follow either of the following options 1 and 2.

[0081] Option 1 The TCI status update is performed for each CSI-RS resource ID of the P-CSI-RS.

[0082] In the example of Fig. 1A, the MAC CE includes at least one of a reserved bit (R) field, a serving cell ID field, a bandwidth part (BWP) ID field, a P-CSI-RS resource ID field, and a TCI state ID field. The TCI state of the P-CSI-RS resource indicated by the P-CSI-RS resource ID is indicated by the TCI state ID field.

[0083] In the example of Figure 1B, the MAC CE includes at least one of an R field, a serving cell ID field, a BWP ID field, N+1 P-CSI-RS resource ID (CSI-RS resource IDs 0 to N) fields, and N+1 TCI state ID (TCI state IDs 0 to N) fields. The N+1 TCI state ID fields correspond to the N+1 P-CSI-RS resource ID fields, respectively. The TCI state of each P-CSI-RS resource is indicated by the corresponding TCI state ID field.

[0084] Option 2 The TCI status update is performed for each CSI-RS resource set ID (CSI-RS resource group ID) of the P-CSI-RS.

[0085] In the example of Figure 2A, the MAC CE includes at least one of an R field, a serving cell ID field, a BWP ID field, a P-CSI-RS resource set ID field, and a TCI state ID field. The TCI state of the P-CSI-RS resource set indicated by the P-CSI-RS resource set ID is indicated by the TCI state ID field.

[0086] In the example of Figure 2B, the MAC CE includes at least one of an R field, a serving cell ID field, a BWP ID field, N+1 P-CSI-RS resource set ID (CSI-RS resource set IDs 0 to N) fields, and N+1 TCI state ID (TCI state IDs 0 to N) fields. The N+1 TCI state ID fields correspond to the N+1 P-CSI-RS resource set ID fields, respectively. The TCI state of each P-CSI-RS resource set is indicated by the corresponding TCI state ID field.

[0087] <<Variation>> The MAC CE may include one or more P-CSI-RS resource set IDs and the TCI state for each P-CSI-RS resource in the resource set.

[0088] In the example of Figure 3, the MAC CE includes at least one of an R field, a serving cell ID field, a BWP ID field, a P-CSI-RS resource set ID field, and M+1 TCI state ID (TCI state IDs 0 to M) fields. The M+1 P-CSI-RS resources in the P-CSI-RS resource set indicated by the P-CSI-RS resource set ID correspond to the M+1 TCI state ID fields. The TCI state of each P-CSI-RS resource is indicated by the corresponding TCI state ID field.

[0089] In the example of Figure 4, the MAC CE includes at least one of an R field, a serving cell ID field, a BWP ID field, N+1 P-CSI-RS resource set ID (CSI-RS resource set IDs 0 to N) fields, and M+1 TCI state ID (TCI state IDs 0 to M) fields per P-CSI-RS resource set ID field. The M+1 P-CSI-RS resources in the P-CSI-RS resource set indicated by each P-CSI-RS resource set ID correspond to the M+1 consecutive TCI state ID fields. The TCI state of each P-CSI-RS resource is indicated by the corresponding TCI state ID field.

[0090] According to the above first embodiment, the TCI state of the P-CSI-RS can be changed without performing RRC reconfiguration, and a large number of P-CSI-RS resources can be used efficiently.

[0091] <Second embodiment> The UE may support the P-CSI-RS to be activated / deactivated via a new MAC CE.

[0092] The MAC CE may include activation / deactivation for one P-CSI-RS resource or one P-CSI-RS resource set or multiple P-CSI-RS resources or multiple P-CSI-RS resource sets. For multiple P-CSI-RS resources / P-CSI-RS resource sets, the MAC CE may indicate the P-CSI-RS resource ID / P-CSI-RS resource set ID explicitly or by bitmap.

[0093] The TCI state for the P-CSI-RS resource (e.g., information element qcl-InfoPeriodicCSI-RS(TCI-StateId)) may be set by RRC signaling (e.g., information element NZP-CSI-RS-Resource). The MAC CE in the second embodiment may not include the TCI State ID field. The TCI state set by the RRC parameters may be used for the transmission of the P-CSI-RS.

[0094] The MAC CE may follow any of Options 1 to 5 below.

[0095] Option 1 Activation / deactivation is performed for one or more P-CSI-RS resources for each CSI-RS resource ID.

[0096] In the example of Figure 5A, the MAC CE includes at least one of an Activation / Deactivation (A / D) field, a Serving Cell ID field, a BWP ID field, and a P-CSI-RS Resource ID field, where the A / D field indicates activation or deactivation of the P-CSI-RS resource indicated by the P-CSI-RS Resource ID.

[0097] In the example of Figure 5B, the MAC CE includes at least one of an R field, a serving cell ID field, a BWP ID field, N+1 A / D fields, and N+1 P-CSI-RS resource ID fields. The N+1 A / D fields correspond to the N+1 P-CSI-RS resource ID fields, respectively. Activation or deactivation of each P-CSI-RS resource is indicated by the corresponding A / D field.

[0098] Option 2 Activation / deactivation is performed for one or more P-CSI-RS resource sets or P-CSI-RS resource groups, for each P-CSI-RS resource set ID or P-CSI-RS resource group ID.

[0099] In the example of Figure 6A, the MAC CE includes an Activation / Deactivation (A / D) field, a Serving Cell ID field, a BWP ID field, and a P-CSI-RS Resource Set ID field, where the A / D field indicates activation or deactivation of the P-CSI-RS resource set indicated by the P-CSI-RS Resource Set ID.

[0100] In the example of Figure 6B, the MAC CE includes at least one of an R field, a serving cell ID field, a BWP ID field, N+1 A / D fields, and N+1 P-CSI-RS resource set ID fields. The N+1 A / D fields correspond to the N+1 P-CSI-RS resource set ID fields, respectively. Activation or deactivation of each P-CSI-RS resource set is indicated by the corresponding A / D field.

[0101] Option 3 The same activation / deactivation is performed for multiple P-CSI-RS resources.

[0102] In the example of Figure 7A, the MAC CE includes at least one of an A / D field, a serving cell ID field, a BWP ID field, and N+1 P-CSI-RS resource ID fields, where activation or deactivation of the N+1 P-CSI-RS resources is indicated by the A / D field.

[0103] Option 4: The same activation / deactivation is performed for multiple P-CSI-RS resource sets.

[0104] In the example of Figure 7B, the MAC CE includes at least one of an A / D field, a serving cell ID field, a BWP ID field, an R field, and N+1 P-CSI-RS resource set ID fields, where activation or deactivation of the N+1 P-CSI-RS resource sets is indicated by the A / D field.

[0105] Option 5: The MAC CE indicates activation / deactivation for each P-CSI-RS resource or each P-CSI-RS resource set by a bitmap.

[0106] In the example of Figure 7C, the MAC CE includes at least one of an R field, a serving cell ID field, a BWP ID field, and a bitmap. The bitmap includes L A / D fields.

[0107] The bitmap may follow either of the following options 5A and 5B.

[0108] [Option 5A] The bitmap length L may be the maximum number of P-CSI-RS resources. Each A / D field may indicate the activation / deactivation of the corresponding P-CSI-RS resource.

[0109] [Option 5B] The bitmap length L may be the maximum number of P-CSI-RS resource sets or P-CSI-RS resource groups. Each A / D field may indicate activation / deactivation of a corresponding P-CSI-RS resource set or a corresponding P-CSI-RS resource group.

[0110] According to the above-described second embodiment, it is possible to perform activation / deactivation of P-CSI-RS without performing RRC reconfiguration, and it is possible to efficiently use a large number of P-CSI-RS resources.

[0111] <Third embodiment> The first and second embodiments may be combined.

[0112] The new MAC CE for P-CSI-RS may follow either of the following options 1 and 2.

[0113] Option 1 The MAC CE may activate the P-CSI-RS resource or P-CSI-RS resource set with the updated TCI state.

[0114] In the example of Figure 8A, the MAC CE includes at least one of an R field, a Serving Cell ID field, a BWP ID field, one P-CSI-RS Resource Set ID field, and one TCI State ID field, where the TCI State ID field indicates the TCI state corresponding to the P-CSI-RS resource indicated by the P-CSI-RS Resource Set ID field.

[0115] In the example of Figure 8B, the MAC CE includes at least one of an R field, a serving cell ID field, a BWP ID field, N+1 P-CSI-RS resource set ID fields, and N+1 TCI state ID fields, which correspond to the N+1 P-CSI-RS resource set ID fields, respectively.

[0116] Option 2 The MAC CE may activate the P-CSI-RS resource or P-CSI-RS resource set with the updated TCI state. The MAC CE may deactivate the P-CSI-RS resource or P-CSI-RS resource set. The MAC CE for deactivation may not include the TCI state ID.

[0117] In the example of Figure 9A, the MAC CE includes at least one of an R field, a serving cell ID field, a BWP ID field, an A / D field, a P-CSI-RS resource set ID field, and a TCI status field. If the value of the A / D field is 1, the P-CSI-RS resource set indicated by the P-CSI-RS resource set ID field is activated and the TCI status field may be present. If the value of the A / D field is 0, the P-CSI-RS resource set indicated by the P-CSI-RS resource set ID field is deactivated and the TCI status field may not be present.

[0118] In the example of FIG. 9B, the MAC CE includes at least one of an R field, a serving cell ID field, a BWP ID field, N+1 A / D fields, N+1 P-CSI-RS resource set ID fields, and N+1 TCI state ID fields. The N+1 A / D fields correspond to the N+1 P-CSI-RS resource set ID fields, respectively. The N+1 TCI state ID fields correspond to the N+1 P-CSI-RS resource set ID fields, respectively. If the value of an A / D field is 1, the P-CSI-RS resource set indicated by the corresponding P-CSI-RS resource set ID field is activated, and the corresponding TCI state field may be present. If the value of an A / D field is 0, the P-CSI-RS resource set indicated by the corresponding P-CSI-RS resource set ID field is deactivated, and the corresponding TCI state field may not be present.

[0119] <<Variation>> The MAC CE may include one or more P-CSI-RS resource set IDs and the TCI state for each P-CSI-RS resource in the resource set.

[0120] In the example of Figure 10A, the MAC CE includes at least one of an R field, a serving cell ID field, a BWP ID field, one P-CSI-RS resource set ID field, and M+1 TCI status fields. The P-CSI-RS resource set indicated by the one P-CSI-RS resource set ID field includes M+1 P-CSI-RS resources. The M+1 TCI status fields correspond to the M+1 P-CSI-RS resources, respectively.

[0121] In the example of Figure 10B, the MAC CE includes at least one of an R field, a serving cell ID field, a BWP ID field, N+1 P-CSI-RS resource set ID fields, and M+1 TCI status fields per P-CSI-RS resource set ID field. A P-CSI-RS resource set indicated by one P-CSI-RS resource set ID field includes M+1 P-CSI-RS resources. The M+1 TCI status fields corresponding to one P-CSI-RS resource set correspond to the M+1 P-CSI-RS resources in the P-CSI-RS resource set, respectively.

[0122] In the example of FIG. 11A, the MAC CE includes at least one of an R field, a serving cell ID field, a BWP ID field, one A / D field, one P-CSI-RS resource set ID field, and M+1 TCI status fields. The P-CSI-RS resource set indicated by the one P-CSI-RS resource set ID field includes M+1 P-CSI-RS resources. The M+1 TCI status fields correspond to the M+1 P-CSI-RS resources, respectively. When the value of the A / D field is 1, the P-CSI-RS resource set indicated by the P-CSI-RS resource set ID field is activated, and the M+1 TCI status fields may be present. When the value of the A / D field is 0, the P-CSI-RS resource set indicated by the P-CSI-RS resource set ID field is deactivated, and the M+1 TCI status fields may not be present.

[0123] In the example of FIG. 11B, the MAC CE includes at least one of an R field, a serving cell ID field, a BWP ID field, N+1 A / D fields, N+1 P-CSI-RS resource set ID fields, and M+1 TCI status ID fields per P-CSI-RS resource set ID field. The N+1 A / D fields correspond to the N+1 P-CSI-RS resource set ID fields, respectively. A P-CSI-RS resource set indicated by a P-CSI-RS resource set ID field includes M+1 P-CSI-RS resources. The M+1 TCI status fields corresponding to a P-CSI-RS resource set correspond to the M+1 P-CSI-RS resources in the P-CSI-RS resource set, respectively. When the value of the A / D field is 1, the P-CSI-RS resource set indicated by the corresponding P-CSI-RS resource set ID field is activated, and there may be M+1 corresponding TCI status fields. If the value of an A / D field is 0, the P-CSI-RS resource set indicated by the corresponding P-CSI-RS Resource Set ID field is deactivated, and the corresponding M+1 TCI Status fields may not be present.

[0124] According to the above third embodiment, the state of P-CSI-RS can be changed without performing RRC reconfiguration, and a large number of P-CSI-RS resources can be used efficiently.

[0125] <Fourth embodiment> The UE may support updating the TCI status of P-CSI-RS across multiple CCs simultaneously.

[0126] If a serving cell indicated by a MAC CE for a P-CSI-RS resource or a P-CSI-RS resource set is configured as part of a simultaneous TCI update list, the MAC CE may be applied to all serving cells configured in the simultaneous TCI update list. The MAC CE may be any MAC CE of the first to third embodiments. The indicated serving cell may be the serving cell indicated by the serving cell ID field in the MAC CE. The simultaneous TCI update list may be a first simultaneous TCI update list (e.g., simultaneousTCI-UpdateList-r16) or a second simultaneous TCI update list (e.g., simultaneousTCI-UpdateListSecond-r16).

[0127] According to the above fourth embodiment, it is possible to reduce the overhead of updating the TCI state.

[0128] <Fifth embodiment> The P-CSI-RS resources may be common to multiple UEs or may be shared by multiple UEs.

[0129] If the MAC CE updates the TCI status of the P-CSI-RS resource for one UE (eg, the first embodiment), it is difficult for multiple UEs to share the same P-CSI-RS resource.

[0130] 12A and 12B, P-CSI-RS #1 to #4 are configured, and P-CSI-RS #1 to #4 have TCI #1 to #4, respectively.

[0131] In the example of Figure 12A, the MAC CE updates the TCI state of P-CSI-RS #2 from TCI #2 to TCI #4. If the TCI state of P-CSI-RS #2 is not updated simultaneously for all UEs, it is difficult for multiple UEs to share P-CSI-RS #2.

[0132] A group common signaling (DCI) using a new RNTI may be used. A specific field in the DCI may indicate at least one of updating the TCI state of the P-CSI-RS resource and activating / deactivating the P-CSI-RS resource. The DCI may schedule a PDSCH including a new MAC CE for at least one of updating the TCI state of the P-CSI-RS resource and activating / deactivating the P-CSI-RS resource. The new MAC CE may be any MAC CE of the first to fourth embodiments.

[0133] If the MAC CE activates / deactivates the P-CSI-RS resources (eg, in the second embodiment), multiple UEs can share the same P-CSI-RS resources.

[0134] In the example of FIG. 12B, the active P-CSI-RS resource is P-CSI-RS#2. In this state, the MAC CE switches the active P-CSI-RS resource from P-CSI-RS#2 to #4. Since the TCI state of each P-CSI-RS resource does not change, multiple UEs can share the same P-CSI-RS resource. When P-CSI-RS#2 is deactivated for one UE, whether P-CSI-RS#2 is actually transmitted to other UEs may depend on the base station implementation. The deactivated P-CSI-RS may not be transmitted to all UEs.

[0135] The RRC parameters may configure multiple P-CSI-RS resources, one TCI state / QCL assumption may be mapped to one P-CSI-RS resource, and the MAC CE may select / indicate one P-CSI-RS resource. The UE may assume the TCI state / QCL assumption corresponding to the selected / indicated P-CSI-RS resource.

[0136] The UE behavior with respect to active and deactive CSI-RS resources in the second embodiment and option 2 of the third embodiment will now be described.

[0137] The UE behavior with respect to active CSI-RS resources may be similar to Rel.15 / 16.

[0138] The UE may not be required to measure deactive P-CSI-RS resources in beam management / Layer 1 (L1)-RSRP / Beam Failure Recovery (BFR) / Radio Resource Management (RLM).

[0139] The UE behavior regarding rate matching / puncturing of the PDSCH may follow either option 1 or 2 below.

[0140] Option 1 The deactive CSI-RS resources may be used for the PDSCH, and rate matching / puncturing of the PDSCH may not be performed around the deactive CSI-RS resources, thereby improving resource utilization efficiency.

[0141] Option 2 Deactive CSI-RS resources are not used for PDSCH. Rate matching / puncturing of PDSCH may be performed around the deactive CSI-RS resources. This allows multiple UEs to share the deactive CSI-RS resources. CSI-RS resources that are deactive for one UE may be active for other UEs.

[0142] In simultaneous reception of the deactive CSI-RS and other DL signals (PDSCH / CSI-RS / TRS / SSB, etc.) using a different QCL type D, there may be no scheduling restriction due to the deactive CSI-RS. This allows the base station to schedule the PDSCH using a different QCL type D in the same symbol as the deactive CSI-RS. The scheduling restriction due to a specific signal (e.g., CSI-RS, deactive CSI-RS) may be that the UE cannot receive other DL signals using a QCL type D different from the QCL type of the specific signal in the same symbol as the specific signal.

[0143] In Rel. 15, there are scheduling restrictions for PDSCH using a different QCL type D on the same symbol as SSB / CSI-RS.

[0144] In the example of Figure 13A, the TCI state of the PDSCH is TCI#3. The P-CSI-RS resources in symbols #1 to #8 have TCI#1 to #8, respectively. In Rel. 15, only symbol #3 of the P-CSI-RS resource with the same TCI state is available for the PDSCH, and symbols #1, #2, #4 to #8 of the P-CSI-RS resource with different TCI states are not available for the PDSCH.

[0145] In the example of Figure 13B, the second embodiment is applied to the example of Figure 13A, where P-CSI-RS resources of symbol #3 only are active and P-CSI-RS resources of symbols #1, #2, #4 to #8 are inactive.

[0146] When a P-CSI-RS resource is deactivated, the UE is not required to measure the P-CSI-RS resource and there may be no scheduling restriction, whereas there may be a scheduling restriction for a PDSCH with a different QCL type D in the same symbol as an active P-CSI-RS resource.

[0147] Activation or deactivation of P-CSI-RS resources may apply to P-CSI-RS resources with specific usage (e.g. L1-RSRP / Beam Management / BFR). For P-CSI-RS resources with usage other than the specific usage, the UE may be required to measure the P-CSI-RS resources. There may be scheduling restrictions for PDSCH with different QCL type D in the same symbol as P-CSI-RS resources with usage other than the specific usage.

[0148] According to the fifth embodiment, it is possible to suppress a decrease in throughput due to scheduling restrictions.

[0149] Sixth embodiment An RRC parameter that enables any of the features of the first to fifth embodiments (e.g., updating P-CSI-RS resources based on MAC CE) may be configured in the UE. If this RRC parameter is configured, the UE may use the feature.

[0150] The UE may report UE capability information indicating that it supports any of the features of the first to fifth embodiments (e.g., updating P-CSI-RS resources based on MAC CE). If the UE reports UE capability information indicating support of the feature, the UE may use the feature. If the UE reports UE capability information indicating support of the feature, RRC parameters enabling the feature may be configured. If the UE reports UE capability information indicating support of the feature and RRC parameters enabling the feature are configured, the UE may use the feature.

[0151] According to the sixth embodiment described above, a large number of P-CSI-RS resources can be used efficiently while maintaining compatibility with existing specifications.

[0152] (Wireless communication system) A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination of these methods.

[0153] 14 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), or the like, which are specified by the Third Generation Partnership Project (3GPP).

[0154] Furthermore, the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

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

[0156] The wireless communication system 1 may support dual connectivity between multiple base stations in the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0157] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged in the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1. A user terminal 20 may be located in at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as a base station 10.

[0158] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0159] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0160] Furthermore, the user terminal 20 may perform communication in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0161] The multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0162] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

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

[0164] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

[0165] The radio access scheme may be called a waveform. In the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0166] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as a downlink channel.

[0167] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

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

[0169] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information of at least one of the PDSCH and the PUSCH.

[0170] In addition, DCI for scheduling PDSCH may be called DL assignment, DL DCI, etc., and DCI for scheduling PUSCH may be called UL grant, UL DCI, etc. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

[0171] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or multiple search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

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

[0173] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and a scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0174] In the present disclosure, a downlink, an uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning of the channels.

[0175] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0176] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) may be called an SS / PBCH block, an SS Block (SSB), or the like. In addition, the SS, SSB, and the like may also be called a reference signal.

[0177] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may be called a user equipment specific reference signal (UE-specific reference signal).

[0178] (base station) 15 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may be provided.

[0179] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0180] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0181] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission and reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0182] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

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

[0184] The transmitting / receiving antenna 130 can be composed of an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0185] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0186] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0187] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0188] The transceiver 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

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

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

[0191] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0192] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0193] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data) for the user terminal 20, control plane data, etc.

[0194] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0195] The transceiver 120 may transmit one or more information elements for periodic channel state information-reference signal (CSI-RS) configuration. The controller 110 may control transmission of a medium access control-control element (MAC CE) including one or more transmission control indication (TCI) states. The one or more TCI states may correspond to the one or more information elements, respectively, and each of the one or more information elements may indicate either a CSI-RS resource or a CSI-RS resource set.

[0196] The transceiver 120 may transmit one or more information elements for periodic channel state information-reference signal (CSI-RS) configuration. The controller 110 may control transmission of a medium access control-control element (MAC CE) including one or more bits. The one or more bits may respectively correspond to the one or more information elements, each of the one or more bits may indicate activation or deactivation of a corresponding information element, and each of the one or more information elements may indicate either a CSI-RS resource or a CSI-RS resource set.

[0197] (User terminal) 16 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0198] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0199] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0200] 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.

[0201] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting / receiving circuit, and the like, which are described based on common understanding in the technical field related to the present disclosure.

[0202] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0203] The transmitting / receiving antenna 230 can be composed of an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.

[0204] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0205] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0206] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0207] The transceiver 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0208] Whether or not to apply the DFT process may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver 220 (transmission processor 2211) may perform the DFT process as the transmission process to transmit the channel using a DFT-s-OFDM waveform, and may not perform the DFT process as the transmission process if transform precoding is enabled for the channel.

[0209] The transceiver unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna 230.

[0210] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna 230.

[0211] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0212] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0213] In addition, the transmitting section and the receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220, the transmitting / receiving antenna 230, and the transmission path interface 240.

[0214] The transceiver 220 may receive one or more information elements for periodic channel state information-reference signal (CSI-RS) configuration. The controller 210 may control reception of a medium access control-control element (MAC CE) including one or more transmission control indication (TCI) states. The one or more TCI states may correspond to the one or more information elements, respectively, and each of the one or more information elements may indicate either a CSI-RS resource or a CSI-RS resource set.

[0215] The MAC CE may include the one or more IDs, where the one or more IDs indicate the one or more information elements, respectively.

[0216] The MAC CE may include the one or more bits, the one or more bits corresponding to the one or more information elements respectively, and each of the one or more bits indicating activation or deactivation of a corresponding information element.

[0217] The receiving unit may receive a list indicating a plurality of serving cells, the MAC CE indicating a serving cell, and if the serving cell is included in the list, the control unit may apply the MAC CE to the plurality of serving cells.

[0218] The transceiver 220 may receive one or more information elements for periodic channel state information-reference signal (CSI-RS) configuration. The controller 210 may control reception of a medium access control-control element (MAC CE) including one or more bits, where the one or more bits correspond to the one or more information elements, respectively, and each of the one or more bits indicates activation or deactivation of a corresponding information element, and each of the one or more information elements may indicate either a CSI-RS resource or a CSI-RS resource set.

[0219] The MAC CE may include the one or more IDs, where the one or more IDs indicate the one or more information elements, respectively.

[0220] When one of the one or more information elements is deactivated, scheduling of a physical downlink shared channel having a different quasi co-location (QCL) type D in a symbol corresponding to the information element may not be restricted.

[0221] The MAC CE may include the one or more TCI states, the one or more TCI states corresponding to the one or more information elements, respectively.

[0222] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0223] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission may be called a transmitting unit, a transmitter, and the like. In either case, as described above, the method of realization is not particularly limited.

[0224] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 17 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0225] In this disclosure, the terms "apparatus," "circuit," "device," "section," "unit," and the like can be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0226] For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processes may be performed by one processor, or the processes may be performed by two or more processors simultaneously, sequentially, or in other manners. Also, the processor 1001 may be implemented by one or more chips.

[0227] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading a specific software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communications via a communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0228] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0229] Moreover, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to the programs. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks may be realized in a similar manner.

[0230] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be called a register, a cache, a main memory (primary storage device), and the like. The memory 1002 can store a program (program code), a software module, and the like that is executable to implement a wireless communication method according to an embodiment of the present disclosure.

[0231] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0232] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0233] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0234] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0235] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0236] (Modification) In addition, the terms explained in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be read as mutually interchangeable. A signal may also be a message. A reference signal may also be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applied standard. A component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, etc.

[0237] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0238] Here, the numerology may be a communication parameter applied to at least one of the transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0239] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may also be a time unit based on numerology.

[0240] A slot may include multiple minislots. Each minislot may be composed of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0241] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. A different name may be used for the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be read as interchangeable with each other.

[0242] For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0243] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0244] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0245] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0246] A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0247] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0248] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0249] In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0250] In addition, one or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0251] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0252] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0253] The BWP may include a UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0254] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0255] The above-mentioned structures of radio frames, subframes, slots, minislots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

[0256] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0257] The names used for parameters and the like in this disclosure are not limiting in any way. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0258] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0259] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via a plurality of network nodes.

[0260] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0261] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0262] The physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. The MAC signaling may be notified, for example, by using a MAC Control Element (CE).

[0263] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0264] The determination may be made based on a value represented by a single bit (0 or 1), a Boolean value represented as true or false, or by comparing numerical values ​​(e.g., with a predetermined value).

[0265] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0266] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0267] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0268] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," and the like may be used interchangeably.

[0269] In this disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0270] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services in this coverage.

[0271] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0272] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0273] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0274] Furthermore, the base station in the present disclosure may be read as a user terminal. For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0275] Similarly, the user terminal in the present disclosure may be interpreted as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0276] In the present disclosure, an operation performed by a base station may be performed by its upper node in some cases. It is clear that in a network including one or more network nodes having base stations, various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0277] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to implementation. In addition, the processing procedures, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be reordered unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0278] Each aspect / embodiment described in the present disclosure may be implemented using any of a wide variety of standards, including Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems using 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other appropriate wireless communication methods, next-generation systems that are based on these, etc. Also, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0279] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0280] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0281] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, and the like.

[0282] A "determining" may also be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.

[0283] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. That is, "determination" may be considered to be "deciding" to perform some action.

[0284] Additionally, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," etc.

[0285] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.

[0286] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0287] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, and the like, as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, and the like, as some non-limiting and non-exhaustive examples.

[0288] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0289] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0290] In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0291] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modified and altered forms without departing from the spirit and scope of the invention defined based on the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the invention according to the present disclosure.

Claims

1. A receiver for receiving one or more information elements for periodic channel state information-reference signal (CSI-RS) configuration; A control unit for controlling reception of a medium access control-control element (MAC CE) including one or more bits; the one or more bits respectively corresponding to the one or more information elements; each of the one or more bits indicating activation or deactivation of a corresponding information element; Each of the one or more information elements indicates one of a CSI-RS resource and a CSI-RS resource set; The MAC CE includes one or more IDs; The one or more IDs each indicate the one or more information elements, The MAC CE includes one or more TCI states; The one or more TCI states correspond to the one or more information elements, respectively.

2. 2. The terminal of claim 1, wherein when one information element of the one or more information elements is inactive, scheduling of a physical downlink shared channel (PDSCH) having a different quasi co-location (QCL) type D is not restricted in a symbol corresponding to the information element, and even when the information element is inactive, when a use of the CSI-RS resource is any of Layer 1 (L1)-RSRP, beam management, and beam failure recovery (BFR), scheduling of a PDSCH having the different QCL type D is restricted in a symbol corresponding to the information element.

3. receiving one or more information elements for periodic channel state information-reference signal (CSI-RS) configuration; and controlling reception of a medium access control-control element (MAC CE) including one or more bits; the one or more bits respectively corresponding to the one or more information elements; each of the one or more bits indicating activation or deactivation of a corresponding information element; Each of the one or more information elements indicates one of a CSI-RS resource and a CSI-RS resource set; The MAC CE includes one or more IDs; The one or more IDs each indicate the one or more information elements, The MAC CE includes one or more TCI states; The one or more TCI states correspond to the one or more information elements, respectively.

4. A transmitter for transmitting one or more information elements for periodic channel state information-reference signal (CSI-RS) configuration; A control unit for controlling transmission of a medium access control-control element (MAC CE) including one or more bits, the one or more bits respectively corresponding to the one or more information elements; each of the one or more bits indicating activation or deactivation of a corresponding information element; Each of the one or more information elements indicates one of a CSI-RS resource and a CSI-RS resource set; The MAC CE includes one or more IDs; The one or more IDs each indicate the one or more information elements, The MAC CE includes one or more TCI states; The one or more TCI states correspond to the one or more information elements, respectively.

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