Terminal, radio communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure is characterized by comprising: a reception unit that receives information indicating a plurality of candidate synchronization signal blocks (SSBs) and a subset of the plurality of candidate SSBs; and a control unit that controls which SSBs are to be received on the basis of the information. According to the one aspect of the present disclosure, SSB transmission and reception can be appropriately controlled in a unit area different from an existing cell.

Description

Terminal, wireless communication method and base station

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

[0002] Long Term Evolution (LTE) has been specified for the Universal Mobile Telecommunications System (UMTS) network with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) has been specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP (registered trademark)) 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.

[0004] 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

[0005] In future wireless communication systems (e.g., NR), it is being considered that terminals (user terminals, User Equipment (UE)) will communicate using unit areas (e.g., more Transmission Reception Points (TRPs) / Access Points (APs)) different from existing cells. In this case, the UE may be located in an environment where it can receive multiple synchronization signal blocks (SSBs) transmitted from multiple TRPs / APs.

[0006] However, for example, in such a case, there has been insufficient consideration as to how to control the transmission of SSB to UEs. If this consideration is insufficient, it may be impossible to appropriately control the SSB transmission, which may hinder reduction in power consumption or inhibit improvement in communication quality / communication throughput.

[0007] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately control transmission and reception of SSB in a unit area that is different from an existing cell.

[0008] A terminal according to one aspect of the present disclosure is characterized in that it includes a receiving unit that receives information indicating a plurality of candidate synchronization signal blocks (SSBs) and some of the SSBs among the plurality of candidate SSBs, and a control unit that controls reception of the SSBs based on the information.

[0009] According to one aspect of the present disclosure, it is possible to appropriately control transmission and reception of SSBs in unit areas different from existing cells.

[0010] FIG. 1 shows an example of RACH common configuration. FIGS. 2A and 2B are diagrams showing examples of RRC information elements related to CSI reporting configuration and CSI resource configuration. FIGS. 3A and 3B are diagrams showing an overview of MIMO. FIGS. 4A and 4B are diagrams showing an overview of a cellular system. FIGS. 4A and 4B are diagrams showing an overview of a cell-free system. FIGS. 5A and 5B are diagrams showing an example of an overview of a cell-free configuration assumption 1. FIGS. 5B and 5C are diagrams showing another example of an overview of a cell-free configuration assumption 2. FIGS. 6A and 6B are diagrams showing an example of SSB transmission according to an embodiment. FIGS. 7A and 7B are diagrams showing an example of SSB configuration according to a first embodiment. FIG. 8 is a diagram showing an example of transmission of an SSB additional transmission request according to a third embodiment. FIG. 9 is a diagram showing an example of association between SSB and CSI-RS according to a fourth embodiment. FIG. 10 is a diagram showing another example of association between SSB and CSI-RS according to the fourth embodiment. Fig. 11 is a diagram showing another example of association between SSB and CSI-RS according to the fourth embodiment. Fig. 12 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. Fig. 13 is a diagram showing an example of a configuration of a base station according to an embodiment. Fig. 14 is a diagram showing an example of a configuration of a user terminal according to an embodiment. Fig. 15 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment. Fig. 16 is a diagram showing an example of a vehicle according to an embodiment.

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

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

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

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

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

[0016] A plurality of types of QCLs (QCL types) may be defined. For example, four QCL types A to D may be provided, each having different parameters (or parameter sets) that can be assumed to be the same.

[0017] The UE's assumption that a Control Resource Set (CORESET), channel, or reference signal has 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 assumption of the signal / channel.

[0019] The TCI state may be, for example, information about the QCL between 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 thereof.

[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] Furthermore, 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 also 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 (DMRS), and this RS may be called a QCL source of QCL type X in the TCI state.

[0025] (Unified / Common TCI Framework) The unified TCI framework allows multiple types of channels / RSs (UL / DL) to be controlled by a common framework. The unified TCI framework does not specify TCI states or spatial relationships for each channel as in Rel. 15. Instead, it may specify a common beam (common TCI state) and apply it to all UL and DL channels, or it may apply a common beam for UL to all UL channels and a common beam for DL ​​to all DL channels.

[0026] One common beam for both DL and UL, or one common beam for DL ​​and one common beam for UL (two common beams overall) are considered.

[0027] The UE may assume the same TCI state for UL and DL (joint TCI state, joint TCI pool, joint common TCI pool, joint TCI state set). The UE may assume different TCI states for UL and DL (separate TCI state, separate TCI pool, UL separate TCI pool and DL separate TCI pool, separate common TCI pool, UL common TCI pool and DL common TCI pool).

[0028] The default beams for UL and DL may be aligned via MAC CE based beam management (MAC CE level beam indication). The default TCI state of the PDSCH may be updated to align with the default UL beam (spatial relationship).

[0029] DCI-based beam management (DCI-level beam indication) may indicate a common beam / unified TCI state from the same TCI pool for both UL and DL (joint common TCI pool, joint TCI pool, set). X (>1) TCI states may be activated by the MAC CE. The UL / DL DCI may select one from the X active TCI states. The selected TCI state may apply to both UL and DL channels / RS.

[0030] The TCI pool (set) may be multiple TCI states configured by RRC parameters, or multiple TCI states (active TCI states, active TCI pools, sets) activated by MAC CE among the multiple TCI states configured by RRC parameters. Each TCI state may be a QCL type A / D RS. SSB, CSI-RS, or SRS may be configured as the QCL type A / D RS.

[0031] The number of TCI states corresponding to each of one or more TRPs may be specified. For example, the number N (≧1) of TCI states applied to UL channels / RSs (UL TCI states) and the number M (≧1) of TCI states applied to DL channels / RSs (DL TCI states) may be specified. At least one of N and M may be notified / configured / instructed to the UE via higher layer signaling / physical layer signaling.

[0032] RRC parameters (information elements) configure multiple TCI states for both DL and UL. MAC CE may activate multiple TCI states from the configured multiple TCI states. DCI may indicate one of the activated multiple TCI states. DCI may be UL / DL DCI. The indicated TCI state may apply to at least one (or all) of the UL / DL channels / RS. One DCI may indicate both UL TCI and DL TCI.

[0033] At least one of the multiple TCI states configured by the RRC parameters and the multiple TCI states activated by the MAC CE may be referred to as a TCI pool (common TCI pool, joint TCI pool, TCI state pool). The multiple TCI states activated by the MAC CE may be referred to as an active TCI pool (active common TCI pool).

[0034] In the present disclosure, higher layer parameters (RRC parameters) for setting multiple TCI states may be referred to as configuration information for setting multiple TCI states, or simply as "configuration information." Also, in the present disclosure, being instructed to set one of multiple TCI states using DCI may mean receiving indication information instructing one of the multiple TCI states included in DCI, or may simply mean receiving "instruction information."

[0035] The RRC parameters also configure multiple TCI states (joint common TCI pools) for both DL and UL. The MAC CE may activate multiple TCI states (active TCI pools) from the configured multiple TCI states. Separate active TCI pools for UL and DL may be configured / activated.

[0036] The DL DCI or a new DCI format may select (indicate) one or more (e.g., one) TCI states. The selected TCI state may apply to one or more (or all) DL channels / RSs. The DL channels may be PDCCH / PDSCH / CSI-RS. The UE may determine the TCI state of each DL channel / RS using the TCI state behavior (TCI framework) of Rel. 16. The UL DCI or a new DCI format may select (indicate) one or more (e.g., one) TCI states. The selected TCI state may apply to one or more (or all) UL channels / RSs. The UL channels may be PUSCH / SRS / PUCCH. In this way, different DCIs may indicate the UL TCI and the DL TCI separately.

[0037] It is assumed that in Rel. 17 NR and later, the MAC CE / DCI supports beam activation / indication to a TCI state associated with a different physical cell identifier (PCI), and in Rel. 18 NR and later, the MAC CE / DCI supports indicating a serving cell change to a cell with a different PCI.

[0038] (Initial Access Procedure) In the initial access procedure, the UE (RRC_IDLE mode) receives an SS / PBCH block (SSB), transmits Msg1 (PRACH / random access preamble / preamble), receives Msg2 (PDCCH, PDSCH including random access response (RAR)), transmits Msg3 (PUSCH scheduled by RAR UL grant), and receives Msg4 (PDCCH, PDSCH including UE contention resolution identity). After that, when an ACK for Msg4 is transmitted from the UE by the base station (network), an RRC connection is established (RRC_CONNECTED mode).

[0039] SSB reception includes PSS detection, SSS detection, PBCH-DMRS detection, and PBCH reception. PSS detection includes detecting part of the physical cell ID (PCI), detecting (synchronizing) OFDM symbol timing, and (coarse) frequency synchronization. SSS detection includes detecting the physical cell ID. PBCH-DMRS detection includes detecting (part of) the SSB index within a half radio frame (5 ms). PBCH reception includes detecting the system frame number (SFN) and radio frame timing (SSB index), receiving configuration information for receiving remaining minimum system information (RMSI, SIB1), and recognizing whether the UE can camp on that cell (carrier).

[0040] SSB has a bandwidth of 20 RBs and a time of 4 symbols. The transmission period of SSB can be set to {5, 10, 20, 40, 80, 160} ms. In a half frame, multiple symbol positions of SSB are defined based on the frequency range (FR1, FR2).

[0041] The PBCH has a payload of 56 bits. N repetitions of the PBCH are transmitted within a period of 80 ms, where N depends on the SSB transmission period.

[0042] The system information consists of the MIB, RMSI (SIB1), and other system information (OSI) carried by the PBCH. SIB1 contains information for random access channel (RACH) configuration and RACH procedures. The time / frequency resource relationship between the SSB and the PDCCH monitoring resource for SIB1 is configured by the PBCH.

[0043] A base station using beam correspondence transmits multiple SSBs using multiple beams for each SSB transmission period. The multiple SSBs have multiple SSB indices. When a UE detects an SSB, it transmits a PRACH in a PRACH occasion (RACH occasion, RO) associated with the SSB index and receives an RAR in an RAR window.

[0044] (PRACH Configuration) The serving cell configuration (ServingCellConfig) can include an UL configuration (UplinkConfig). The UplinkConfig can include a list of UL BWP configurations (BWP-Uplink). The BWP-Uplink can include a common UL BWP configuration (BWP-UplinkCommon). The BWP-UplinkCommon can include a common RACH configuration (RACH-ConfigCommon).

[0045] RACH-ConfigCommon is used to specify cell-specific random access parameters. As shown in Figure 1, RACH-ConfigCommon may include a generic RACH configuration (RACH-ConfigGeneric), a total number of RA preambles (totalNumberOfRA-Preambles), and a combination of the number of SSBs per PRACH occasion (RACH occasion, RO) and the number of contention-based (CB) preambles per SSB (ssb-perRACH-OccasionAndCB-PreamblesPerSSB).

[0046] RACH-ConfigGeneric is used to specify random access parameters for both normal random access and beam failure recovery. RACH-ConfigGeneric may include a PRACH configuration index (prach-ConfigurationIndex) and message 1 FDM (msg1-FDM, the number of ROs FDMed in one time instance).

[0047] ssb-perRACH-OccasionAndCB-PreamblesPerSSB may include the number of SSBs per RO, N (e.g., N=1 / 8, oneEighth, one SSB associated with eight ROs) and the number of CB preambles per SSB, R.

[0048] The cell group configuration (CellGroupConfig) can include an SpCell configuration (SpCellConfig). The SpCellConfig can include a reconfiguration with synchronization (ReconfigurationWithSync, e.g., handover configuration). The ReconfigurationWithSync can include a dedicated RACH configuration (RACH-ConfigDedicated).

[0049] (CSI) In NR, the UE measures the channel state using a reference signal (or a resource for the reference signal) and feeds back (reports) channel state information (CSI) to the network (e.g., a base station).

[0050] 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.

[0051] The CSI-RS resource 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.

[0052] Resources for measuring signal components for CSI may be referred to as signal measurement resources (SMR) or channel measurement resources (CMR). The SMR (CMR) may include, for example, NZP CSI-RS resources, SSBs, etc. for channel measurement.

[0053] A resource for measuring interference components for CSI may be referred to as an interference measurement resource (IMR). The IMR may include, for example, at least one of an NZP CSI-RS resource, an SSB, a ZP CSI-RS resource, and a CSI-IM resource for interference measurement.

[0054] 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).

[0055] 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), L1-SNR (Signal to Noise Ratio), and the like.

[0056] The CSI may have multiple parts: CSI Part 1 may include information with a relatively small number of bits (e.g., RI), and 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.

[0057] 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 referred to as type I CSI, single-beam CSI, etc.) and a CSI type set for communication using multiple beams (also referred to as type II CSI, multi-beam CSI, etc.) may be defined. The use of CSI types is not limited to this.

[0058] As CSI feedback methods, periodic CSI (P-CSI) reporting, aperiodic CSI (A-CSI) reporting, semi-persistent CSI (SP-CSI) reporting, etc. are being considered.

[0059] The UE may be notified of the CSI measurement configuration information using higher layer signaling, physical layer signaling, or a combination thereof.

[0060] 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.

[0061] 2A and 2B are diagrams illustrating an example of RRC information elements related to CSI reporting configuration and CSI resource configuration. In this example, excerpts of fields (which may also be referred to as parameters) included in the information elements are illustrated. 2A and 2B are written using ASN.1 (Abstract Syntax Notation One) notation. Note that other figures relating to RRC information elements (or RRC parameters) in the present disclosure are also written using the same notation.

[0062] As shown in FIG. 2A , 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").

[0063] In addition, the IDs of the CSI resource configuration information corresponding to each piece of resource information (which may also be called CSI resource configuration IDs) may be one or more of the same value, or may each have a different value.

[0064] As shown in Figure 2B, 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").

[0065] The resource type indicates the time domain behavior of this resource configuration, and can be set to "aperiodic," "semi-persistent," or "periodic." For example, the corresponding CSI-RSs may be called A-CSI-RS, SP-CSI-RS, and P-CSI-RS, respectively.

[0066] 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.

[0067] When interference measurements are performed on CSI-IM, each CSI-RS for channel measurements may be associated with a CSI-IM resource in terms of resources based on the order of the CSI-RS resources and CSI-IM resources in the corresponding resource set.

[0068] The "nzp-CSI-RS-SSB" may include NZP CSI-RS resource set list information ("nzp-CSI-RS-ResourceSetList") and SSB resource set list information for CSI measurements ("csi-SSB-ResourceSetList"), which correspond to one or more NZP CSI-RS resource set IDs ("NZP-CSI-RS-ResourceSetId") and CSI-SSB resource set IDs ("CSI-SSB-ResourceSetId"), respectively, and may be used to identify resources to be measured.

[0069] The NZP CSI-RS resource set list information ("nzp-CSI-RS-ResourceSetList") may include an NZP CSI-RS resource set ID ("NZP-CSI-RS-ResourceSetId") of the maximum number of NZP CSI-RS resource sets per CSI resource configuration ("maxNrofNZP-CSI-RS-ResourceSetsPerConfig"), which may be up to 16 if the resource type is "aperiodic" and 1 otherwise (if the resource type is "semi-persistent" or "periodic").

[0070] The SSB resource set list information for CSI measurements ("csi-SSB-ResourceSetList") may include the CSI-SSB resource set IDs ("CSI-SSB-ResourceSetId") of the maximum number of SSB resource sets for CSI measurements per CSI resource configuration ("maxNrofCSI-SSB-ResourceSetsPerConfig"). The maximum number of SSB resource sets for CSI measurements per CSI resource configuration ("maxNrofCSI-SSB-ResourceSetsPerConfig") may be 1.

[0071] The CSI-IM resource set list information ("csi-IM-ResourceSetList") may include the CSI-IM resource set ID ("CSI-IM-ResourceSetId") of the maximum number of CSI-IM resource sets per CSI resource configuration ("maxNrofCSI-IM-ResourceSetsPerConfig"), which may be up to 16 if the resource type is "aperiodic" and 1 otherwise.

[0072] (Cell-free) Existing wireless communication systems (e.g., 5G NR) have adopted a cellular system in which one cell is formed by one antenna / transmitting / receiving point (TRP). The area formed by the cell is a fixed / static area.

[0073] In addition, existing wireless communication systems (e.g., Rel. 16 and later) have introduced distributed multi-input multi-output (Distributed MIMO, e.g., multi-TRP using multiple TRPs), which forms a communication area using the coverage of multiple antennas / TRPs. Distributed MIMO allows simultaneous communication using multiple antennas / TRPs and communication using one antenna / TRP.

[0074] By adopting distributed MIMO, it is possible to create a more favorable line-of-sight environment and improve MIMO performance.

[0075] 3A and 3B are diagrams illustrating an overview of MIMO. Fig. 3A illustrates an example of co-located MIMO. In co-located MIMO, one UE communicates with one antenna / TRP.

[0076] On the other hand, Figure 3B illustrates an example of distributed MIMO, in which one UE communicates with multiple antennas / TRPs in cooperation with each other.

[0077] In future wireless communication systems (e.g., Rel. 20 and later), the introduction of cell-free communication is being considered with the aim of further improving performance and energy efficiency through reducing interference between multiple antennas / TRPs, creating a line-of-sight environment for high-frequency use, improving frequency utilization efficiency throughout the system, and applying equal, high-quality communication to each user.

[0078] Self-Free may also be referred to as cell-free massive MIMO (mMIMO) or large-scale distributed MIMO (D-MIMO). Self-Free uses coherent cooperation of multiple access points. Self-Free may include at least one of ultra-dense deployment, scalable cooperation, user-centric clustering, super-carrier aggregation, and analog fronthaul. The user plane for cell-free may perform more flexible scheduling than existing scheduling. The control plane for cell-free may retain some form of cell to facilitate signaling.

[0079] In cell-free, unlike conventional cellular systems, one area (which may be called a cell / sub-cell, etc.) may be formed by multiple antennas / TRPs. In other words, the area may mean a cell that is independent of the location of the antenna / TRP.

[0080] In cell-free, the set of antennas / TRPs used to form a coverage area may be changed according to the needs of UEs. For example, the set of antennas / TRPs may be changed based on the number of UEs, the number of traffic, communication purposes (e.g., initial access, data communication, measurement, reporting, etc.), etc., rather than the coverage of the antennas / TRPs.

[0081] In other words, in cell-free, the coverage between multiple antennas / TRPs may overlap.

[0082] In cell-free mode, the direction in which a synchronization signal (which may also be called, for example, a synchronization signal block (SSB), a synchronization signal / physical broadcast channel (SS / PBCH) block, etc.) is transmitted may be controlled for each antenna / TRP.

[0083] In addition, in cell-free, a central unit (CU) / distributed unit (DU) may be virtualized for each antenna, or each antenna may be managed by only the CU.

[0084] Fig. 4A is a diagram showing an overview of a cellular system, in which cells formed by each antenna / TRP are shown, and UEs communicate based on these cells.

[0085] On the other hand, Figure 4B is a diagram showing an overview of a cell-free system. In the example shown in Figure 4B, the installed antennas / TRPs do not form fixed / static cells in a cellular system. As shown in Figure 4B, in a cell-free system, one or more antennas / TRPs form areas according to conditions. Therefore, in a cell-free system, each antenna / TRP does not need to correspond to the same physical cell ID, and the areas between multiple antennas / TRPs may overlap.

[0086] Self-regulation may be achieved, for example, by coordinating a set of antennas / TRPs controlled by a central control unit (e.g., CU).

[0087] In a cell-free system, a first cell (which may be called, for example, a cell / super cell / macro cell / large cell, etc.) with a fixed physical range like a cell in a 5G NR system, and a second cell (which may be called, for example, a subcell / area / micro cell / cell / small cell / second cell within the first cell, etc.) with a quasi-static / dynamic physical range that varies based on conditions may be formed.

[0088] For example, a first cell may be referred to as a supercell to distinguish it from a second cell. When a supercell is composed of multiple second cells, the second cells may have the same definition / operation / coverage as existing cells in NR. For example, a second cell may be referred to as a subcell to distinguish it from a first cell. When a supercell or a cell is composed of multiple subcells, the subcells may have the same definition / operation / coverage as existing cells in NR.

[0089] The first cell may be a cell that is newly defined in a future wireless communication system, or may be a cell defined in an existing wireless communication system that is reused.

[0090] The configurations of the first cell and the second cell can be considered as follows: Assumption 1 and Assumption 2: The first cell is composed of multiple TRPs with a single cell ID (physical cell ID (PCI)). The multiple TRPs can transmit and receive in coordination. Assumption 2: The first cell is composed of multiple TRPs (or sub-cells) with different cell IDs. The multiple TRPs / sub-cells can transmit and receive in coordination.

[0091] 5A is a diagram showing an example of the outline of the cell-free configuration assumption 1. In the example shown in FIG. 5A, each TRP included in the first cell (super cell / cell) has the same PCI (PCI #0). Multiple TRPs can communicate with one UE in a coordinated manner.

[0092] Figure 5B is a diagram showing an example of the outline of the cell-free configuration assumption 2. In the example shown in Figure 5B, each TRP included in the first cell (super cell / cell) has a different PCI (PCI #0 to #9). Multiple TRPs can communicate with one UE in a coordinated manner.

[0093] Figure 5C is a diagram showing another example of the outline of the cell-free configuration assumption 2. In the example shown in Figure 5C, a PCI is assigned to each TRP included in the first cell (supercell / cell). In the example shown in Figure 5C, unlike the example in Figure 5B, the same PCI may correspond to multiple TRPs. Multiple TRPs can communicate cooperatively with one UE.

[0094] Transmission / reception with TRP / subcell coordination may be based on at least one of the following schemes supported in NR: - Transmission of a single TRP / subcell with dynamic TRP / subcell switching (single-TRP transmission). - Joint transmission using multiple TRPs / subcells (multi-TRP joint transmission). The joint transmission may be based on a single DCI or multiple DCIs. The joint transmission may be non-coherent joint transmission (NCJT) or coherent joint transmission (CJT).

[0095] For cell-free, assuming ideal backhaul and tight coordination, in the joint transmission scheme, CJT may be prioritized over NCJT, and single DCI-based joint transmission may be prioritized over multi-DCI-based joint transmission.

[0096] Selfly can realize large-scale distributed MIMO, low layer (e.g., L2 / L1) mobility, and flexible TRP clustering. For example, when applied to ultra-high density TRP, cell / TRP clustering for mobility / control and data can be separated.

[0097] The cell-free approach has the following features: - It can increase the TRP deployment density per cell, thereby improving the signal-to-noise ratio (SNR) for all UEs, including those in conventional cell edge areas. - It can realize flexible (e.g., UE-centric) TRP clustering for cell construction, thereby reducing the number of UEs affected by inter-cell / inter-TRP interference. - It can realize mobility at lower layers. Since more TRPs can be considered in one clustering, seamless mobility can be achieved, for example, by operating at the L1 level.

[0098] For selfies, Concept 1 or 2 below may apply.

[0099] <Concept 1> Selfry selects multiple TRPs / access points (APs), and transmission / reception with the TRPs / APs targets only data (e.g., PDSCH / PUSCH) (e.g., at the physical / MAC layer). In this case, cell selection, initial access, and mobility are not significantly affected compared to existing methods. LTM (e.g., LTM before Rel. 18) may be reused, or enhancements to LTM may be made. L1 measurement / reporting or extended SRS transmission for multiple TRPs / APs selection, CSI measurement / reporting or extended SRS transmission for CSI of TRPs / APs in different clusters, etc. may be performed.

[0100] Concept 2: Selection of multiple TRPs / APs and transmission / reception with TRPs / APs covers both control channels / signals (e.g., in RRC) and data (e.g., PDSCH / PUSCH) (e.g., in the physical / MAC layer).

[0101] In this case, compared to existing methods, there are impacts on cell selection, initial access, and mobility in addition to the measurement / reporting of data L1 / CSI in Concept 1. For example, since a UE needs to access multiple TRPs / APs during initial access, SSB / SI / RACH also need to be redesigned.

[0102] When clustering multiple TRPs / APs for control channels / signaling and data, the clustering method (e.g., TRPs / APs in a cluster) may be the same or different, which may have potential impacts when clustering multiple DUs / CUs that are not in the same geographical location.

[0103] <CCs of Different Frequencies (Carrier Aggregation (CA) Scenario)> Selfry may be applied to CCs of different frequencies (CA scenario). The above multiple TRPs / APs may be processed individually for each CC or jointly across multiple CCs. For example, clustering and scheduling may take into account both the TRP dimension and the CC dimension.

[0104] <Application in Multi-TRP> There are two approaches to application in cell-free multi-TRP.

[0105] The first approach is joint transmission / reception (JT / JR), where multiple TRPs (e.g., one intra-cluster TRP) receive / transmit one UL / DL. JT / JR may allow for larger UE ranks / layers, but may make multi-user scheduling more difficult.

[0106] The second approach is Dynamic Point Selection (DPS), where one UL / DL is received / transmitted on one TRP. Dynamic TRP switching or the use of a relatively small number of TRPs is possible. This may limit the rank / layer that a UE can achieve. It may also facilitate multi-user scheduling.

[0107] Either one of the above two approaches may be applied, or both may be applied. For example, a DPS that runs each JT / JR in a cluster may also be considered as a DPS that runs each JT / JR in a cluster.

[0108] (Analysis) As described above, in future wireless communication systems (e.g., NR), it is being considered that a terminal (user terminal, User Equipment (UE)) will communicate using a unit area (e.g., more transmission / reception points TRP / AP, cell-free configuration) different from existing cells. In this case, the UE may be located in an environment where it can receive multiple SSBs transmitted from multiple TRP / APs.

[0109] In the following description, the supercell may correspond to the first cell in the above-mentioned cell-free system. The cell may correspond to the second cell in the above-mentioned cell-free system. Assumption 1 / Assumption 2 may be applied to the configuration of the supercell.

[0110] For example, the denser the allocation of TRPs for one first cell, the more TRPs allocated, and the more SSBs will be required to be transmitted, and these SSBs may be transmitted from different TRPs associated with the same / different PCIs.

[0111] For example, in such a cell-free environment, a UE may transmit / receive signals / channels for multiple TRPs and may be within the coverage areas of multiple TRPs, so there are situations in which not all TRPs may transmit SSBs in a cell-free scenario.

[0112] However, for example, in such a case, there has been insufficient consideration as to how to control the transmission of SSB to UEs. If this consideration is insufficient, it may be impossible to appropriately control the SSB transmission, which may hinder reduction in power consumption or inhibit improvement in communication quality / communication throughput.

[0113] Therefore, the present inventors have conceived a new method for controlling SSB transmissions.

[0114] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0115] (Various Reinterpretations) In the present disclosure, a word enclosed in "( )" in a sentence may indicate an explanation of the word immediately preceding it (for example, an explanation of spelling), a paraphrase, a specific example, a supplementary explanation, etc. Furthermore, in the present disclosure, a word enclosed in "[ ]" in a sentence may be interpreted including the word in the meaning of the entire sentence, or may be interpreted excluding (ignoring) the word in the meaning of the entire sentence. Note that "( )" and "[ ]" may also be used for purposes / meanings other than those mentioned above.

[0116] In the present disclosure, "A / B" and "at least one of A and B" may be interpreted interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0117] In the present disclosure, terms such as notify, activate, deactivate, indicate (or indicate), select, configure, update, and determine may be read interchangeably. In the present disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

[0118] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, fields, information elements (IEs), settings, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0119] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, other messages (e.g., messages from the core network such as positioning protocol (e.g., NR Positioning Protocol A (NRPPa) / LTE Positioning Protocol (LPP)) messages), or a combination thereof.

[0120] In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. 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.

[0121] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0122] In this disclosure, a b , a_b, and a with b added to the bottom right of a may be read interchangeably. c , a^c, and the notation of a with c added to the upper right of a may be read interchangeably. b c, a_b^c, a notation with b added to the bottom right of a and c added to the top right, may be read as interchangeable. In the present disclosure, ceil(x), ceiling function, and ceiling function may be read as interchangeable. In the present disclosure, floor(x), floor function, and floor function may be read as interchangeable.

[0123] In the present disclosure, RACH resource, RA resource, PRACH preamble, occasion, RACH occasion (RO), PRACH occasion, repetition resource, repetition setting resource, resource configured for RO / repetition, time instance and frequency instance, time resource and frequency resource, RO / preamble resource, repetition, PRACH resource, time / frequency resource for PRACH, preamble setting / index, mask setting / index, PRACH setting may be read as interchangeable.

[0124] In the present disclosure, the terms time occasion, time domain position, time position, PRACH occasion, PRACH slot, period, period, symbol / slot / subframe / frame, and at least one index thereof, time domain index, T#, may be interchangeable. In the present disclosure, the terms frequency domain position, frequency position, subcarrier / RE / RB / CC, and at least one index thereof, frequency domain index, F#, may be interchangeable. In the present disclosure, the terms RO, RO index, and RO# may be interchangeable.

[0125] In the present disclosure, the base station (BS), TRP, AP, gNB, and network (NW) may be interchangeable.

[0126] In the present disclosure, the terms cell, area, coverage, first cell, and second cell may be interchangeable. In the present disclosure, the terms first cell, super cell, multiple TRPs / APs, and set / group of TRPs / APs may be interchangeable. In the present disclosure, the terms second cell, sub cell, multiple TRPs / APs, and set / group / subset / cluster of TRPs / APs may be interchangeable.

[0127] In the present disclosure, the first message, Msg1 (Message 1, Msg.1), RACH, PRACH (preamble), and random access preamble may be interchangeable. In the present disclosure, the second message, Msg2 (Message 2, Msg.2), RAR, at least one of the RAR PDSCH and the PDCCH scheduling it, and the RAR UL grant may be interchangeable. In the present disclosure, the third message, Msg3 (Message 3, Msg.3), the PUSCH carrying an RRC Setup Request message, and the Msg3 PUSCH may be interchangeable. In the present disclosure, the fourth message, Msg4 (Message 4, Msg.4), the PDSCH carrying an RRC Setup message, the Msg4 PDSCH, and the PDSCH received after the Msg3 PUSCH transmission may be interchangeable.

[0128] In the present disclosure, synchronization signal (SS), PSS, SSS, PBCH, SSB, SS / PBCH block, SSB index, SS / PBCH block index, candidate SS / PBCH block index, CSI-RS, CSI-RS resource, and CSI-RS resource index may be interpreted as interchangeable.

[0129] (Wireless Communication Method) In 6G, for example, support of a predetermined maximum number (for example, 64, 128) for SSB is under consideration.

[0130] For example, suppose that transmitting 100 SSBs to a certain area at a certain frequency can achieve good operational coverage / communication performance. That is, even if many UEs exist in the area, transmitting 100 SSBs allows the network to maintain / achieve good coverage / communication performance.

[0131] The SSB transmission configuration that can achieve good coverage / communication performance under such various possible conditions can be considered as a maximum scheme for designing coverage / communication performance. Therefore, for example, by estimating the number of SSB transmissions required for an area taking into account coverage, communication performance, and other factors, it is possible to set a preferred maximum number of SSB transmissions. Note that, for example, transmitting SSBs at the maximum number set for an area may be referred to as full SSB transmission hereinafter.

[0132] On the other hand, as mentioned above, for example, when a UE is within the coverage of multiple TRPs, not all TRPs may transmit SSBs (only some TRPs may transmit SSBs). Therefore, the NW may transmit only some (e.g., 32) of the SSBs transmitted in a full SSB transmission to achieve acceptable coverage / communication performance, although not the best. Transmitting only some (only) of the SSBs transmitted in a full SSB transmission may be referred to as partial SSB transmission hereinafter.

[0133] 6A and 6B are diagrams illustrating SSB transmissions according to an embodiment, where Fig. 6A illustrates a full SSB transmission and Fig. 6B illustrates a partial SSB transmission.

[0134] In Figure 6A, the areas covered by SSBs with SSB indexes SSB #2, SSB #5, and SSB #4 overlap, and UE1 can receive multiple SSBs, SSB #2, SSB #5, and SSB #4, from multiple TRPs. Note that the areas covered by the SSBs may correspond to beams used to transmit the SSBs, for example.

[0135] In this case, even if some of SSBs (e.g., SSB #2 and SSB #4) among SSB #2, SSB #5, and SSB #4 are not transmitted, the UE can receive the remaining SSBs (e.g., SSB #5). Therefore, transmission of some of the SSBs transmitted from multiple TRPs may be stopped.

[0136] In the partial SSB transmission shown in Figure 6B, the TRP that was transmitting SSBs #2 and #4, which cover the same area as UE1, stops transmitting these SSBs. In this case, UE1 can still receive SSB #5.

[0137] Similarly, in FIG. 6A, the areas covered by SSBs SSB #16, SSB #73, and SSB #110 overlap, and UE1 can receive multiple SSBs SSB #16, SSB #73, and SSB #110 from multiple TRPs.

[0138] 6B, the SSB transmission of SSB #73 and SSB #110, which cover the same area as UE 2, is stopped. In this case, UE 2 can still receive SSB #16.

[0139] In this way, among the multiple TRPs corresponding to SSBs covering overlapping areas, if some TRPs transmit SSBs, the other TRPs do not need to transmit SSBs. Note that the TRPs that do not transmit SSBs may transmit other specific channels / signals (e.g., PDCCH / PDSCH).

[0140] By reducing the number of SSB transmissions in this way, it is possible to shorten the time required for SSB transmission and reduce power consumption, for example.

[0141] Furthermore, the NW may more flexibly / dynamically update the SSB transmission configuration based on actual coverage / communication performance requirements (e.g., requests from UEs), and may update the SSB transmission configuration non-transparently to the UE (without the UE receiving an explicit instruction).

[0142] The network may, for example, switch between full SSB transmission and partial SSB transmission, thereby enabling appropriate SSB transmission depending on the situation.

[0143] For example, suppose a network is transmitting partial SSB to an area at time t1, and then if the number of UEs in the area becomes large (e.g., the number of UEs in the area exceeds a threshold), the network may decide to transmit more SSB at time t2 (e.g., change to full SSB transmission) to improve coverage / communication performance.

[0144] Also, for example, if a network is transmitting full SSB to a certain area, and the number of UEs in the area decreases (e.g., the number of UEs in the area falls below a threshold), the network may decide to transmit less SSB (e.g., change to partial SSB transmission).

[0145] The change in SSB transmission may also be triggered by the UE. For example, the UE may request the NW to increase the number of SSB transmissions when the current communication quality falls below a certain quality. Alternatively, for example, the UE may request the NW to decrease the number of SSB transmissions when the current communication quality exceeds a certain quality.

[0146] The UE may also obtain, for example, the gap between the current coverage / communication performance of the NW and the maximum coverage / communication performance available to the NW, and may decide to trigger more SSB transmissions to improve performance in the current cell instead of moving to another cell.

[0147] In this way, the UE can trigger changes in SSB transmission, allowing for quicker / more appropriate control of SSB transmission.

[0148] Note that the NW may control the SSBs to be transmitted in full SSB transmission and partial SSB transmission, for example, by turning off / on transmission of [partial] SSBs that can be transmitted by the TRP. In this case, the UE may store properties of SSBs with the same index (e.g., parameters related to the configuration / beam / sequence / time resource / frequency resource / period) used for the SSB.

[0149] In another example, the NW may control the SSB to be transmitted in the full SSB transmission and the partial SSB transmission by changing the beam pattern of the TRP. In this case, even if the SSB configuration is updated, the UE may not need to save the SSB properties.

[0150] In the following, the embodiments will be described in more detail. Note that in the embodiments described below, each SSB or each group / set / cluster of SSBs may correspond to one TRP, one TRP cluster, one cell, one cell group, or one supercell in a cell-free scenario.

[0151] First Embodiment The first embodiment relates to SSB configuration for a UE.

[0152] As described above, for example, when there are multiple SSBs covering the same coverage area, the NW may transmit only some of the multiple SSBs.

[0153] The UE may be configured with information indicating multiple candidate SSBs as transmission candidates (for a given coverage area).

[0154] The number of candidate SSBs that is set may indicate the maximum number of SSBs that can be transmitted [in a certain coverage area].

[0155] For example, the transmission of all of the candidate SSBs may indicate a full SSB transmission, and the collection of candidate SSBs may be referred to as a full SSB.

[0156] The UE may be configured with information indicating some of the candidate SSBs.

[0157] Some of the configured SSBs may indicate SSBs that are actually to be transmitted (or may be SSBs that the UE is to receive; they may also be called actual SSBs).

[0158] For example, transmitting a set of SSBs may indicate partial SSB transmission. Also, a set of partial SSBs may be referred to as partial SSB / actual partial SSB.

[0159] Among the full SSBs, SSBs other than the partial SSBs may not be transmitted, and the set of SSBs that are not transmitted may be called non-transmitted SSBs.

[0160] The UE may be configured / provided with an SSB configuration indicating full SSB and partial SSB.

[0161] The UE may receive the SSB configuration, for example, through higher layer signaling (e.g., system information (e.g., SIB1)).

[0162] The SSB configuration may be, for example, in the form of at least one of option 1.1 and option 1.2 below.

[0163] <<Option 1.1>> The UE may receive, for example, SSB configuration on one carrier / cell via system information (e.g., SIB1), and the SSB configuration may be configured in association with at least one of an area, a TRP, a set / group of TRPs, a TRP cluster, a cell, a cell group, and a supercell, for example in a cell-free scenario.

[0164] The SSB settings may include, for example, at least one of a full SSB setting indicating full SSB (which may be called a first SSB setting) and a partial SSB setting indicating partial SSB (which may be called a second SSB setting).

[0165] The first SSB configuration may include, for example, SSB indexes and / or locations of multiple (eg, all) candidate SSBs (eg, full SSBs) that are candidates for transmission on one carrier / cell.

[0166] The second SSB configuration may also include at least one of an SSB index and a location of an SSB that is actually configured for transmission in one carrier / cell. For example, the second SSB configuration may indicate at least one of an index and a location of an SSB that the NW transmits in partial SSB transmission.

[0167] The SSB indicated in the second SSB setting may be a portion of the SSB indicated in the first SSB setting.

[0168] 7A and 7B are diagrams illustrating SSB settings according to the first embodiment. Fig. 7A illustrates an SSB setting according to option 1.1.

[0169] As shown in FIG. 7A, the SSB configuration includes, for example, a full SSB configuration and a partial SSB configuration.

[0170] The full SSB setting indicates an SSB index of 0 to 99. The partial SSB setting indicates an SSB index of 0 to 22 and 39 to 63.

[0171] In this case, the SSB indices: 0 to 99 configured as the full SSB setting are candidate SSBs, and the UE may assume that, of the candidate SSBs, only the SSB indices: 0 to 22, 39 to 63 indicated in the partial SSB setting will be transmitted.

[0172] Furthermore, the UE may assume that of the SSB indices 0 to 99 configured as full SSB settings, the remaining SSB indices 23 to 38 and SSB indices 64 to 99 are not transmitted (non-transmitted SSBs).

[0173] The UE may also assume that the SSBs are transmitted with a specific periodicity, which may be, for example, a default periodicity (e.g., ssb-periodicity).

[0174] That is, for example, when a UE receives the SSB configuration of FIG. 7A, it may assume that the SSBs with SSB indices 0 to 22 and 39 to 63 indicated in the partial SSB configuration will be transmitted at a specific period, and the remaining SSBs with SSB indices 23 to 38 and SSB indices 64 to 99 will not be transmitted.

[0175] On the other hand, for example, when full SSB transmission is indicated by an instruction from the network or a decision made by the UE, the UE may assume that multiple (e.g., all) candidate SSBs (SSB indexes: 0 to 99) indicated in the full SSB setting will be transmitted. Furthermore, the transmission period of the multiple candidate SSBs may be, for example, a specific period (e.g., a default period).

[0176] The particular periodicity may be, for example, a value defined in a specification or may be set / indicated by system information (eg, SIB1) / RRC signaling / MAC CE / DCI.

[0177] <<Option 1.2>> Another example of SSB configuration for one carrier / cell is shown. Note that in Option 1.2, the SSB configuration may also be transmitted to the UE via system information (e.g., SIB1). Furthermore, in a cell-free scenario, the SSB configuration may be configured in association with at least one of one area, one TRP, a set / group of TRPs, one TRP cluster, one cell, one cell group, and one supercell.

[0178] In option 1.2, the SSB configuration includes information indicating multiple SSB groups.

[0179] The information indicating the SSB group may include at least one of information identifying the group (e.g., a group index), information indicating the SSBs belonging to the group (e.g., an SSB index), information indicating whether or not an SSB is being transmitted, and information indicating the transmission period of the SSB.

[0180] The SSB group may include multiple SSB groups (for example, first to nth SSB groups (n is any integer)).

[0181] For example, an SSB group may belong to at least one of the following types: - An SSB group with a default period (which may be referred to as a first SSB group): The UE assumes that the SSBs of the group are transmitted at the default period. - An SSB group with a designated period (which may be referred to as a second SSB group): The UE assumes that the SSBs of the group are transmitted at the designated period. Note that the designated period may be greater or less than the default period. An SSB group with a designated period may be referred to as an SSB group with a period other than the default period. - A non-transmitting SSB group (which may be referred to as a third SSB group): The UE assumes that the SSBs of the group are not transmitted.

[0182] The SSB configuration may include all types of the first SSB group, the second SSB group, and the third SSB group, or may not include some types (but may include some types).

[0183] The information indicating multiple SSB groups may indicate SSBs transmitted in partial SSB transmission. For example, the SSBs transmitted in partial SSB transmission may be indicated by setting at least one of the first SSB group and the second SSB group. The SSBs transmitted in partial SSB transmission may be indicated by setting a group other than the third group (e.g., the first / second SSB group).

[0184] The SSBs transmitted in a full SSB transmission may be, for example, all SSBs denoted as the first SSB group, the second SSB group, and the third SSB group.

[0185] 7B is a diagram illustrating an SSB configuration according to Option 1.2. Three SSB groups, SSB Group #0, SSB Group #1, and SSB Group #2, are shown in FIG. 7B. The number of SSB groups included in the SSB configuration is not limited to three, and other numbers of SSB groups may be included.

[0186] 7B, SSB group #0 is an example of an SSB group having a default periodicity. SSB group #0 is configured with the following settings: SSB indexes 0 to 39 for SSBs belonging to SSB group #0, transmitted status (transmitted: yes), and transmission periodicity (default). The UE may assume that the SSBs belonging to SSB group #0 are transmitted at the default periodicity.

[0187] SSB group #1 is an example of an SSB group having a specified period. SSB group #1 is configured with SSB indices 40 to 63 for the SSBs belonging to SSB group #1, transmitted (transmitted: Yes), and a transmission periodicity of 160 ms. The transmission period may be set to a period longer than the default transmission periodicity. The UE may assume that the SSBs belonging to SSB group #1 are transmitted at the specified periodicity (e.g., 160 ms).

[0188] SSB group #2 is an example of a non-transmitting SSB group. SSB group #2 is configured with SSB indices 64 to 99 for SSBs belonging to SSB group #2 and transmitted status: No. The UE may assume that SSBs belonging to SSB group #2 will not be transmitted.

[0189] The UE may then decide between full SSB and partial SSB based on, for example, the groups included in the SSB configuration.

[0190] For example, the UE may consider the set of SSBs indicated in SSB group #0 and SSB group #1 as partial SSBs (SSBs transmitted in partial SSB transmission). Note that in partial SSB transmission, SSB group #0 may be transmitted at a default period, and SSBs in SSB group #1 may be transmitted at a specified period.

[0191] Furthermore, the UE may consider the set of SSBs of all groups, for example, SSB group #0 to SSB group #2, as a full SSB (SSBs transmitted in a full SSB transmission). In a full SSB transmission, the UE may consider all SSBs of SSB group #0 to SSB group #2 to be transmitted at a default period.

[0192] Furthermore, for an SSB group having a default period, at least one of the information indicating whether or not SSB is being transmitted and the information indicating the SSB transmission period may be omitted in the SSB configuration. For example, in FIG. 7B , the information indicating whether or not SSB is being transmitted (transmitted: Yes) and the information indicating the SSB transmission period (periodicity: default) for SSB group #0 may be omitted.

[0193] The UE may also consider a specific group / group index as an SSB group with a default period. For example, the UE may consider group index 0 (SSB group #0) as an SSB group with a default period. The UE may also consider the group with the smallest group index as an SSB group with a default period.

[0194] Also, specific rules may be defined for the UE to distinguish between SSB groups with a default periodicity and SSB groups with a non-default periodicity before decoding system information (e.g., SIB1), for example, the rules may be defined by a specification.

[0195] The rule may be, for example, at least one of the following rules 1 to 3. Rule 1: Assume [only] an SSB having an SSB index equal to or less than a specific value M (SSB index <= M) as an SSB with a default period. Rule 2: Assume [only] an SSB with an odd (or even) SSB index as an SSB with a default period. Rule 3: Assume [only] an SSB with an SSB index divisible (or not divisible) by a specific value N as an SSB with a default period.

[0196] The specific value M and the specific value N may be, for example, natural numbers.

[0197] The UE can identify the SSB with the default period based on the rule, for example, even before decoding the system information (e.g., SIB1), thereby enabling the UE to obtain accurate SSB measurement results, for example, even before decoding the system information.

[0198] <Variations> With regard to the periodicity of the SSB groups, at least one of the following options may be applied: Option 1: Different (e.g., different) periods are set for different SSB groups; Option 2: The same periodicity may be set for different SSB groups.

[0199] Furthermore, the following conditions may apply regarding the maximum / minimum number of SSB groups: X SSB groups can (maximum number) / should (minimum number) have the same period (or default period); Y SSB groups can (maximum number) / should (minimum number) be groups instructed to transmit; Z SSB groups can (maximum number) / should (minimum number) be groups instructed not to transmit (not transmit); W SSB groups can (maximum number) / should (minimum number) be group #0.

[0200] X, Y, Z, and W may be, for example, natural numbers. Furthermore, X, Y, Z, and W set as the maximum numbers may be different from X, Y, Z, and W set as the minimum numbers. For example, X, Y, Z, and W set as the maximum numbers may be greater than X, Y, Z, and W set as the minimum numbers.

[0201] As described above, according to the first embodiment, a set of full SSB and partial SSB can be configured for a UE, which allows the UE to properly receive SSB, for example, in either full SSB transmission or partial SSB transmission.

[0202] Second Embodiment The second embodiment relates to the configuration of RACH resources.

[0203] The RACH resource may be configured in association with the SSB. For example, as described in the first embodiment, when the SSB configuration includes information indicating full SSB / partial SSB, the RACH resource may be configured according to the SSB configuration.

[0204] The information indicating full SSB may be, for example, the full SSB setting in the SSB setting of Fig. 7A. Also, the information indicating full SSB may be, for example, SSB transmitted by full SSB transmission in the SSB setting of Fig. 7B (for example, SSB group #0, SSB group #1, and SSB group #2).

[0205] The information indicating the partial SSB may be, for example, the partial SSB setting in the SSB setting of Fig. 7A. Furthermore, the information indicating the partial SSB may be, for example, the SSB (e.g., SSB group #0 and SSB group #1) transmitted by the partial SSB in the SSB setting of Fig. 7B.

[0206] Hereinafter, in embodiments 2.1 and 2.2, the RACH resource configuration (for example, RACH-ConfigCommon) will be described.

[0207] <<Embodiment 2.1>> Embodiment 2.1 may be applied to, for example, the case of option 1.1 of the first embodiment.

[0208] The RACH resource may be configured according to at least one of the following options: Option 2.1.1: RACH resource configuration is provided [only] for the SSBs indicated in the partial SSB configuration (i.e., RACH resource configuration is not provided for the remaining SSBs indicated in the full SSB configuration other than the SSBs indicated in the partial SSB configuration). Option 2.1.2: RACH resource configuration is provided for the SSBs indicated in the full SSB configuration.

[0209] Furthermore, in the case of Option 2.1.2, RACH resources may be configured by at least one of the following: Option 2.1.2-1: A common SSB resource configuration is provided for the SSBs indicated in the partial SSB configuration and the remaining SSBs among the SSBs indicated in the full SSB configuration. Option 2.1.2-2: A separate RACH resource configuration is provided for the SSBs indicated in the partial SSB configuration and the remaining SSBs among the SSBs indicated in the full SSB configuration (for example, the RACH occasion (RO) periodicity (e.g., sb-Periodicity) is made different from the RO periodicity of the SSBs indicated in the partial SSB configuration).

[0210] <<Embodiment 2.2>> Embodiment 2.2 may be applied, for example, to the case of option 1.2 of the first embodiment.

[0211] The RACH resource may be configured using one of the following options: Option 2.2.3: RACH resource configuration is provided [only] for SSB groups with a default period (e.g., SSB group #0 only). That is, RACH resource configuration is not provided for SSBs of SSB groups with a specified period (e.g., SSB group #1) and non-transmitting SSB groups (e.g., SSB group #2). Option 2.2.4: RACH resource configuration is provided [only] for partial SSBs. That is, RACH resource configuration is provided for SSBs of SSB groups with a default period (e.g., SSB group #0) and SSB groups with a specified period (e.g., SSB group #1). No RACH resource configuration is provided for SSBs of non-transmitting SSB groups (e.g., SSB group #2). Option 2.2.5: RACH resource configuration is provided for full SSBs. That is, the RACH resource configuration is provided for all SSBs indicated in the SSB group with the default period (e.g., SSB group #0), the SSB group with the indicated period (e.g., SSB group #1), and the non-transmitting SSB group (e.g., SSB group #2).

[0212] In addition, in the case of Option 2.2.4, RACH resources may be provided by at least one of the following: Option 2.2.4-1: A common RACH resource configuration is provided for SSB groups having different transmission cycles. Option 2.2.4-2: An individual RACH resource configuration is provided for SSB groups having different transmission cycles. For example, different RO cycles may be configured for SSB groups having different transmission cycles. Also, for example, different RO cycles may be configured for different SSB groups.

[0213] In the case of Option 2.2.5, RACH resources may be further provided by at least one of the following: Option 2.2.5-1: A common RACH resource configuration is provided for all SSB groups. Option 2.2.5-2: A RACH resource configuration is provided separately for an SSB group indicating partial SSB and an SSB group indicating non-transmission SSB (non-transmission SSB group). Note that the SSB group indicating partial SSB may be, for example, both an SSB group having a default period and an SSB group having a specified period. Option 2.2.5-3: A separate RACH resource configuration is provided for each SSB group. Here, at least one of whether or not SSB is transmitted and the transmission period may differ for each group.

[0214] As described above, according to the second embodiment, when the SSB configuration includes information indicating full SSB / partial SSB, the RACH resource can be appropriately configured in accordance with the SSB configuration.

[0215] Third Embodiment The third embodiment relates to updating / switching of SSBs to be transmitted.

[0216] The NW may, for example, perform updating / switching of the SSB to be transmitted based on a request from the UE (which may be referred to as, for example, a request for additional transmission of the SSB).

[0217] The UE may support, for example, an SSB additional transmission request, which may, for example, request to transmit more SSBs than are currently being transmitted.

[0218] For example, when the NW receives a request for additional SSB transmission, the NW may add SSBs to be transmitted in response to the request, thereby transmitting more SSBs than before the request was received. The SSBs added in the request for additional SSB transmission may be, for example, a specific SSB, a specific set of SSBs, a specific SSB group, or all remaining SSBs (e.g., all SSBs not currently being transmitted among the full SSBs). The specific SSBs may be indicated, for example, by a specific additional SSB index.

[0219] The UE may request additional SSB transmissions via, for example, the first message / third message of the initial access (e.g., RACH) procedure. Examples of the additional SSB transmission requests will be described below for the first message and the third message, respectively.

[0220] <<Option 3.1: Requesting Additional Transmission of SSB Using Third Message>> The UE may transmit additional transmission request signaling for SSB, for example, in the third message of the initial access procedure.

[0221] If the UE indicates an SSB in the third message by at least one of an SSB index, an SSB group index, or an SSB set index, the NW may determine this as an additional transmission request for one or more of the indicated SSBs.

[0222] If the UE does not explicitly indicate a specific SSB in the third message (by at least one of the SSB index, SSB group index, and SSB set index), the NW may interpret this as an additional transmission request for all remaining SSBs.

[0223] The NW may also interpret the additional SSB transmission request in the third message as a request to transmit SSBs at a higher frequency (e.g., at the default period) for SSBs of an SSB group having the indicated period (e.g., having a period greater than the default period).

[0224] <<Option 3.2: Request for Additional SSB Transmission Using First Message>> The UE may transmit a request for additional SSB transmission, for example, in the first message of the initial access procedure.

[0225] The additional SSB transmission request by the first message may be applied, for example, when a RACH resource configuration is provided for at least one of a non-transmitting SSB group and an SSB group having a specified periodicity (e.g., an SSB group having a periodicity other than the default). For example, the additional SSB transmission request by the first message may be applied in Option 2.1.2 / Option 2.2.4 / Option 2.2.5 of the second embodiment described above.

[0226] For example, the UE may transmit a first message on a RACH resource configured for SSBs of a non-transmitting SSB group or an SSB group with an indicated periodicity. In this case, the NW may interpret this first message as an additional transmission request for at least one of the SSBs of the SSB index / SSB group index associated with the RACH resource on which the first message was received and [all] the remaining SSBs. The remaining [all] SSBs may include, for example, at least one of the SSBs of the non-transmitting SSB group and the SSB group with the indicated periodicity.

[0227] The NW may determine that an additional transmission request for an SSB of a non-transmission SSB group is a transmission request for an SSB of a non-transmission SSB group.

[0228] The NW may interpret an additional transmission request for an SSB of an SSB group having the indicated period as a request to transmit an SSB at a higher frequency (e.g., a default period) for an SSB of an SSB group having the indicated period.

[0229] For example, when the NW receives the first message, it may determine that the first message is an additional transmission request for the SSB of the SSB index associated with the RACH resource.

[0230] Furthermore, when the NW receives the first message, it may determine that the first message is an additional transmission request for an SSB of the SSB group that includes the SSB index associated with the RACH resource.

[0231] When the NW receives the first message, it may regard it as an additional transmission request for all remaining SSBs, which may include, for example, SSBs of the non-transmitting SSB group and / or SSBs of the SSB group having the indicated period.

[0232] Also, if the SSB for which additional transmission is requested is an SSB group with an indicated period, the additional transmission request may be a request for SSB transmission at a higher frequency (eg, a default period).

[0233] When the NW receives a request for additional transmission of an SSB, the NW may determine, for example, based on an implementation algorithm, whether to change / update the transmission / settings of the SSB for which additional transmission is requested.

[0234] When the NW determines to change / update the SSB transmission / settings, the NW may notify the UE of system information (e.g., SIB1) in which the SSB setting / RACH resource setting has been changed / updated based on the additional transmission request, and transmit the SSB according to the changed / updated SSB setting, thereby enabling the UE to receive more SSBs than those received in the partial SSB transmission before the change / update.

[0235] 8 is a diagram illustrating transmission of an additional SSB transmission request according to the third embodiment. A four-step random access procedure is illustrated in FIG. 8. The UE may transmit the additional SSB transmission request in, for example, Msg1 / Msg3.

[0236] As described above, according to the third embodiment, the UE can request the NW to transmit additional SSBs. This allows the UE to increase the number of SSBs transmitted from the NW and receive more SSBs. For example, when the UE cannot receive SSBs with sufficient reception strength / reception quality (e.g., the reception quality (RSRP / SINR) of the SSBs is below a threshold), the UE may transmit a request to transmit additional SSBs. This allows the UE to detect SSBs with higher reception strength / reception quality from among the newly transmitted SSBs.

[0237] <Variations> In the above-described embodiments, an example is described in which information is notified to a UE using system information (e.g., SIB1). However, the embodiments are not limited to this. For example, the first to third embodiments may be applied to an RRC-connected UE. As an example, the embodiments may be applied to a UE in a connected state for Network Energy Saving (NES).

[0238] In this case, information may be notified to the UE by RRC / MAC CE / DCI instead of system information (e.g., SIB1). For example, the SSB configuration / RACH resource configuration may be notified / changed / updated by RRC / MAC CE / DCI.

[0239] In the third embodiment, an example is described in which the UE transmits an SSB additional transmission request using the first message / third message. However, the embodiment is not limited thereto. For example, the UE may transmit the SSB additional transmission request using other signaling such as SR, MAC CE, L1 beam measurement / reporting, or other UL RRC IE report (e.g., UE Assistance Information, UAI). Also, the UE may transmit the SSB additional transmission request using the first message (e.g., MsgA) of the two-step random access procedure.

[0240] When an SSB additional transmission request is transmitted in a MAC CE, a new MAC CE may be provided to request the additional transmission of the SSB. The new MAC CE may include, for example, information / fields indicating a specific SSB, a specific set of SSBs, a specific SSB group, or all remaining SSBs that are the subject of the additional transmission request. The new MAC CE may not include information / fields indicating a specific SSB, and may instead indicate, for example, a request for the additional transmission of all remaining SSBs.

[0241] As described above, various signaling methods can be used to implement the embodiments.

[0242] Fourth Embodiment The fourth embodiment relates to a CSI-RS resource / CSI-RS associated with an SSB. For example, the configuration / status control of the CSI-RS resource / CSI-RS associated with an SSB may be different between a partial SSB and a non-transmitting SSB.

[0243] The partial SSB may be, for example, an SSB indicated in the partial SSB setting in option 1.1 of the first embodiment. The non-transmitting SSB may be, for example, an SSB indicated in the full SSB setting in option 1.1 of the first embodiment but not indicated in the partial SSB setting.

[0244] Also, the partial SSB may be, for example, an SSB of an SSB group having a default period and an SSB group having a designated period in option 1.2 of the first embodiment. The non-transmitting SSB may be, for example, an SSB of a non-transmitting SSB group in option 1.2 of the first embodiment.

[0245] Below, we will describe the control of CSI-RS resources / CSI-RS configuration / status based on whether or not associated SSBs are transmitted.

[0246] <<Option 4.1>> CSI-RS resources / CSI-RS may be configured to be associated with SSB [only].

[0247] The SSB associated with the CSI-RS resource / CSI-RS may be a partial SSB or a non-transmitting SSB.

[0248] For example, the UE may assume that the CSI-RS resources / CSI-RS associated with the partial SSB are activated.

[0249] Also, for example, the UE may assume that the CSI-RS resources / CSI-RS associated with the non-transmitting SSBs are deactivated.

[0250] In addition, activation of a CSI-RS resource / CSI-RS may include, for example, at least one of the following: the UE assumes that the CSI-RS resource / CSI-RS is used for measurements, and the UE assumes that the associated TCI state is activated.

[0251] Furthermore, the CSI-RS resource / CSI-RS being deactivated may include, for example, the UE assuming that the CSI-RS resource / CSI-RS is not used for measurements and / or assuming that the associated TCI state is deactivated.

[0252] 9 is a diagram showing an example of association between SSBs and CSI-RSs according to the fourth embodiment. In FIG. 9, CSI-RSs are associated with partial SSBs (SSB #2, SSB #4) or non-transmitting SSBs (SSB #5). Furthermore, CSI-RSs #1-8 associated with partial SSB #2 and CSI-RSs #9-16 associated with partial SSB #4 are activated. Meanwhile, CSI-RSs #17-24 associated with non-transmitting SSB #5 are deactivated.

[0253] <<Option 4.2>> CSI-RS resources / CSI-RS may be configured to be associated with partial SSB [only].

[0254] For example, no CSI-RS resource / CSI-RS may be configured for non-transmitting SSBs.

[0255] In addition, when the NW updates the partial SSB configuration, it may also update the associated CSI-RS resources / CSI-RS configuration.

[0256] 10 is a diagram showing another example of association between SSBs and CSI-RSs according to the fourth embodiment. In FIG. 10, CSI-RSs are associated with partial SSB #2 and partial SSB #4. On the other hand, no CSI-RS is associated with non-transmitting SSB #5.

[0257] 10, the TRP associated with SSB #5 does not transmit SSB #5, but may transmit CSI-RS. For example, in the TRP associated with SSB #5, the CSI-RS transmitted from that TRP may be associated with the SSB of another TRP.

[0258] For example, in Figure 10, CSI-RS #17 to #20 transmitted by the TRP associated with SSB #5 are associated with SSB #2 transmitted by another TRP. Also, in Figure 10, CSI-RS #21 to #24 transmitted by the TRP associated with SSB #5 are associated with SSB #4 transmitted by another TRP.

[0259] For example, as described above, a TRP that does not transmit an SSB may transmit a CSI-RS by associating the CSI-RS with an SSB transmitted by another TRP.

[0260] <<Option 4.3>> A CSI-RS resource / CSI-RS may be configured to be associated with multiple SSBs. Different / independent association priorities may be configured for the multiple SSBs associated with one CSI-RS resource / CSI-RS.

[0261] For example, the multiple SSBs associated with a CSI-RS resource / CSI-RS may include partial SSBs and / or non-transmitting SSBs.

[0262] If the associated multiple SSBs include both partial SSBs and non-transmitting SSBs, the UE may assume that the CSI-RS is associated with the partial SSBs.

[0263] If the associated SSBs include multiple partial SSBs, the UE may assume that the CSI-RS is associated with an SSB that has a particular (eg, highest) association priority.

[0264] If the associated multiple SSBs include a partial SSB, the UE may assume that the CSI-RS is activated.

[0265] If [all] of the associated SSBs are non-transmitting SSBs, the UE may assume that the CSI-RS is deactivated.

[0266] The UE may determine the priorities of multiple SSBs associated with a CSI-RS resource / CSI-RS according to a specific rule (e.g., a rule based on SSB index). For example, the UE may determine that an SSB with a smaller SSB index has a higher priority.

[0267] Additionally, the UE may be configured with priorities for multiple SSBs associated with a CSI-RS resource / CSI-RS. For example, the association of multiple SSBs with a CSI-RS resource / CSI-RS may further be associated with priorities for each SSB.

[0268] 11 is a diagram showing another example of association between SSBs and CSI-RSs according to the fourth embodiment. In FIG. 11, multiple SSBs are associated with a CSI-RS. For example, partial SSB #2 and non-transmitting SSB #5 are associated with CSI-RS #17. In this case, the UE may assume that CSI-RS #17 is activated and that partial SSB #2 is associated with it.

[0269] Also, when multiple partial SSBs #2 and #4 are associated, such as CSI-RS #1, the UE may assume that CSI-RS #1 is activated and associated with the highest priority SSB #2 (e.g., SSB #2 with the smallest SSB index).

[0270] If all associated SSBs, such as CSI-RS#25, are non-transmitting SSBs, the UE may assume that CSI-RS#25 is deactivated.

[0271] <Variations> Separate signaling (e.g., RRC / MAC CE / DCI) may be used to update at least one of the activation / deactivation (ON / OFF) of the CSI-RS and the association of the CSI-RS with the SSB.

[0272] <Other Modifications> In the above-described embodiments, each configuration may be configured in association with (or applied to) a set / cluster of TRP / AP / SSB / CSI-RS or a super cell. For example, at least one of the SSB configuration in the first embodiment, the RACH resource configuration in the second embodiment, and the CSI-RS resource configuration associated with SSB in the fourth embodiment may be configured in association with (or applied to) at least one of the set / cluster of TRP / AP / SSB / CSI-RS and the super cell.

[0273] These settings may also be updated when at least one of the TRP / AP / SSB / CSI-RS set / cluster and the supercell for the UE is changed. The update may be performed, for example, by at least one of the following: The UE sends a request to update the settings and updates the settings; Updates the settings based on predefined rules or pre-configuration; Expects to receive updated settings from the NW.

[0274] In addition, although the above-described embodiment is described using an example in which the TRPs in a supercell have the same PCI (i.e., the case in which Assumption 1 is applied to the supercell configuration), the embodiment is not limited thereto. The embodiment may also be implemented in other supercell configurations (e.g., the case in which Assumption 2 is applied).

[0275] The first to fourth embodiments described above may be implemented in combination, for example, the options included in the first to fourth embodiments may be implemented in combination.

[0276] In the above-described embodiment, the beam may be, for example, SSB / CSI-RS / TRS / SRS / other reference RS. Also, the beam may be, for example, a DL TCI state / UL TCI state / joint TCI state.

[0277] In the above-described embodiment, the measurement values ​​obtained by the UE measuring the measurement target resources may be, for example, L1-RSRP / L1-SINR / L1-RSRQ / L3-RSRP / L3-SINR / L3-RSRQ. These measurement values ​​may also be filtered (L1-filtered / L3-filtered) measurement values / enhanced L1 measurement values.

[0278] <<Notification of Information to UE>> In the above-described embodiments, notification of any information to the UE [from a Network (NW) (e.g., a Base Station (BS))] (in other words, reception of any information from the BS by the UE) may be performed using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.

[0279] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new Logical Channel ID (LCID) in the MAC subheader, which is not defined in existing standards.

[0280] When the notification is made by DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0281] Furthermore, notification of any information to the UE in the above embodiments may be performed periodically, semi-persistently, or aperiodically.

[0282] <<Notification of Information from UE>> In the above-described embodiments, notification of any information from the UE [to the NW] (in other words, transmission / report of any information from the UE to the BS) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.

[0283] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new LCID, which is not defined in existing standards, in the MAC subheader.

[0284] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0285] Furthermore, any information in the above-described embodiments may be notified from the UE periodically, semi-persistently, or aperiodically.

[0286] <<Regarding Application of Each Embodiment>> In a UE / BS, specific (one or more) processes / operations / controls / assumptions / information for at least one of the above-mentioned embodiments may be applied (used) when one or more of the following conditions are met: - a higher layer parameter indicating the specific processes / operations / controls / assumptions / information is configured; - the specific processes / operations / controls / assumptions / information is determined based on related higher layer parameters; - the specific processes / operations / controls / assumptions / information is specified / activated / triggered by a MAC CE / DCI / UCI / resource / channel / RS; - a specific UE capability indicating (or related to) the specific processes / operations / controls / assumptions / information is reported or supported; - the application of the specific processes / operations / controls / assumptions / information is determined based on specific conditions.

[0287] The specific UE capabilities may indicate at least one of the following: Supporting specific processes / operations / controls / assumptions / information of the above embodiments / options Supporting specific combinations of processes / operations / controls / assumptions / information of the above embodiments / options Supporting configuration indicating full SSB and partial SSB Supporting additional SSB transmission requests (e.g., supporting additional SSB transmission requests via at least one of Msg1, Msg3, SR, MAC CE, L1 beam measurement / reporting, or other UL RRC IE reports (e.g., UE Assistance Information, UAI)) Supporting updating of CSI-RS activation / deactivation based on partial SSB / non-transmitting SSB Supporting updating of SSB-CSI-RS association based on partial SSB / non-transmitting SSB Supporting configuration of CSI-RS associated with partial SSB / non-transmitting SSB. Support for configuring CSI-RS associated with multiple SSBs.

[0288] Furthermore, the above-mentioned specific UE capability may be a capability that is applied across all frequencies (commonly regardless of frequency), or may be a capability for each frequency (e.g., one or a combination of a cell, a band, a band combination, a BWP, a component carrier, etc.), or may be a capability for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or may be a capability for each subcarrier spacing (SubCarrier Spacing (SCS)), or may be a capability for each Feature Set (FS) or Feature Set Per Component-carrier (FSPC).

[0289] Furthermore, the specific UE capability may be a capability that is applied to all duplexing methods (commonly regardless of the duplexing method), or may be a capability for each duplexing method (e.g., Time Division Duplex (TDD) or Frequency Division Duplex (FDD)).

[0290] If the above conditions are not met, the UE / BS may follow the behavior specified in existing 3GPP releases.

[0291] (Supplementary Notes) The following inventions are supplementary notes regarding one embodiment of the present disclosure. Supplementary Note 1 may relate to, for example, the first embodiment. Supplementary Note 2 may relate to, for example, the second embodiment. Supplementary Note 3 may relate to, for example, the third embodiment. Supplementary Note 4 may relate to, for example, the fourth embodiment. [Supplementary Note 1] A terminal including: a receiver that receives information indicating a plurality of candidate synchronization signal blocks (SSBs) and some SSBs among the plurality of candidate SSBs; and a controller that controls reception of the SSBs based on the information. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the receiver further receives information indicating random access channel (RACH) resources associated with the plurality of candidate SSBs or the some SSBs. [Supplementary Note 3] The terminal according to Supplementary Note 1, wherein the controller controls transmission of additional transmission requests for SSBs other than the some SSBs among the plurality of candidate SSBs. [Supplementary Note 4] The terminal according to Supplementary Note 1, wherein the receiving unit further receives information indicating a channel state information reference signal (CSI-RS) resource associated with the plurality of candidate SSBs or the portion of the SSBs. [Supplementary Note 5] A wireless communication method for a terminal, comprising: receiving information indicating a plurality of candidate synchronization signal blocks (SSBs) and some of the SSBs among the plurality of candidate SSBs; and controlling reception of SSBs based on the information. [Supplementary Note 6] A base station, comprising: a transmitting unit that transmits information indicating a plurality of candidate synchronization signal blocks (SSBs) and some of the SSBs among the plurality of candidate SSBs; and a control unit that controls transmission of SSBs based on the information.

[0292] (Wireless Communication System) The 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 thereof.

[0293] 12 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 (which may be simply referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0294] The wireless communication system 1 may also support dual connectivity between multiple 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)), etc.

[0295] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (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.

[0296] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0297] 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 located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The location, number, shape, size, etc. 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 the base station 10.

[0298] The wireless communication system 1 may utilize multi-input multi-output (MIMO). For example, one cell may be formed by one antenna / base station 10, or may be formed by multiple antennas / base stations 10. One [virtual] cell (which may be called, for example, a supercell) may be composed of multiple [virtual] cells (which may be called, for example, subcells). A supercell may correspond to a cell with a fixed physical range, and a subcell may correspond to a cell with a quasi-static / dynamically variable physical range. In this case, the wireless communication system 1 may be called a cell-free system.

[0299] 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 (CCs) and dual connectivity (DC).

[0300] 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 higher than 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 higher frequency band than FR2.

[0301] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0302] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 / Xn 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.

[0303] 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, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0304] The core network 30 may include network functions (Network Functions (NF)) such as a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM). A single network node may provide multiple functions. Communication with an external network (e.g., the Internet) may also be performed via the DN.

[0305] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0306] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0307] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0308] 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 the downlink channel.

[0309] Furthermore, 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)), or the like may be used as an uplink channel.

[0310] 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).

[0311] 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 for at least one of the PDSCH and the PUSCH.

[0312] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0313] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching 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 more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0314] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0315] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0316] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0317] 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.

[0318] 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 an SS (PSS, SSS) and a PBCH (and a DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as a reference signal.

[0319] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0320] (Base Station) Fig. 13 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0321] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0322] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from 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.

[0323] 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 transceiver unit 120, the transceiver 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 transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0324] 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.

[0325] 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, the RF unit 122, and a measurement unit 123.

[0326] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0327] 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.

[0328] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0329] The transmitter / receiver unit 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.

[0330] The transmitter / receiver unit 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.

[0331] The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

[0332] 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 band signal received by the transceiver antenna 130.

[0333] 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.

[0334] 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.

[0335] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30 (e.g., network nodes that provide NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0336] 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.

[0337] The base station 10 may be separated into three elements: a radio unit (RU), a distributed unit (DU), and a central unit (CU). For example, the RU may implement RF processing (digital beamforming, digital-to-analog conversion, analog beamforming, etc.) and lower-level functions of the physical layer (precoding, IFFT, FFT, etc.). The DU may implement higher-level functions of the physical layer (coding to resource element mapping, etc.), MAC layer functions, and RLC layer functions. The CU may implement the functions of the PDCP layer, Service Data Adaptation Protocol (SDAP) layer, and RRC layer.

[0338] In the present disclosure, the base station 10 may include a single device that realizes all of the functions of the RU, DU, and CU, or may include multiple devices that each realize some of the functions of the RU, DU, and CU and are connected to each other. In the present disclosure, the base station 10 may be interchangeably read as RU / DU / CU.

[0339] The transmitter / receiver 120 may transmit information indicating a plurality of candidate synchronization signal blocks (SSBs) and some of the candidate SSBs. The information may be, for example, the SSB setting in the first embodiment. The controller 110 may control the transmission of the SSBs based on the information.

[0340] (User Terminal) Fig. 14 is a diagram showing an example of the configuration of a user terminal according to one 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.

[0341] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0342] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

[0343] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transceiver unit 220.

[0344] The transceiver 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 transceiver unit 220 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.

[0345] 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.

[0346] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0347] 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.

[0348] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0349] 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.

[0350] The transmitter / receiver unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0351] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and if not, it may not be necessary to perform DFT processing as the transmission processing.

[0352] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0353] 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 band signal received by the transceiver antenna 230.

[0354] The transceiver unit 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.

[0355] 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.

[0356] The measurement unit 223 may derive channel measurements for CSI calculation based on the channel measurement resources. The channel measurement resources may be, for example, non-zero power (NZP) CSI-RS resources. The measurement unit 223 may also derive interference measurements for CSI calculation based on the interference measurement resources. The interference measurement resources may be at least one of an NZP CSI-RS resource for interference measurement, a CSI-Interference Measurement (IM) resource, etc. Note that CSI-IM may be referred to as CSI-Interference Management (IM) or may be interchangeably read as Zero Power (ZP) CSI-RS. Note that in the present disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc. may be interchangeably read as interchangeable.

[0357] The transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0358] The transmitter / receiver 220 may receive information indicating a plurality of candidate synchronization signal blocks (SSBs) and some of the candidate SSBs. The information may be, for example, the SSB setting in the first embodiment. The controller 210 may control reception of the SSBs based on the information.

[0359] The transceiver 220 may receive information indicating random access channel (RACH) resources associated with a plurality of candidate SSBs or a portion of the SSBs. The information indicating the random access channel (RACH) resources may be, for example, the RACH resource configuration in the second embodiment.

[0360] The control unit 210 may control the transmission of additional transmission requests for SSBs other than some of the candidate SSBs. The additional transmission requests for SSBs may be transmitted, for example, by the first message / third message in the third embodiment.

[0361] The transceiver 220 may further receive information indicating channel state information reference signal (CSI-RS) resources associated with the plurality of candidate SSBs or some of the SSBs. The information indicating the channel state information reference signal (CSI-RS) resources may be, for example, the association between the SSBs and the CSI-RSs in the fourth embodiment.

[0362] (Hardware Configuration) Note that 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. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0363] 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, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As described above, the implementation method of each is not particularly limited.

[0364] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 15 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may 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.

[0365] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used 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.

[0366] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0367] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0368] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as 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), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0369] The processor 1001 also reads 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 in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0370] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0371] Storage 1003 is a computer-readable recording medium and may be composed of at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0372] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. 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.

[0373] 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 outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0374] Furthermore, 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.

[0375] 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), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0376] In addition, the devices included in the core network 30 (for example, network nodes that provide NF) may also be realized by the above-mentioned functional block / hardware configuration.

[0377] (Modifications) Note that terms described in the present disclosure and terms necessary for understanding the present 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 interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0378] 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.

[0379] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0380] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0381] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist 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.

[0382] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to 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 interchangeable.

[0383] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in 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.

[0384] Here, TTI refers to, for example, the smallest 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.

[0385] 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) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0386] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0387] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0388] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 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 greater than or equal to 1 ms.

[0389] 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 numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0390] 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 which may be composed of one or more resource blocks.

[0391] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0392] 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.

[0393] A Bandwidth Part (BWP), which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0394] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0395] 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 read as "BWP."

[0396] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. 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, etc. may be changed in various ways.

[0397] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0398] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions 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 intended to be limiting in any way.

[0399] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0400] 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 multiple network nodes.

[0401] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0402] With respect to any information (e.g., variables, constants, parameters) described in the present disclosure, even if not specifically stated in the above embodiments, any first device (e.g., UE / base station) may notify any second device (e.g., base station / UE) of information indicating / specifying (or relating to) the value of the any information.

[0403] 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.

[0404] Note that the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be referred to as an RRC message, such as an RRC Connection Setup message or an RRC Connection Reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0405] 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).

[0406] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0407] 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.

[0408] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if 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), these wired and / or wireless technologies are included within the definition of transmission media.

[0409] 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).

[0410] 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," "layer," "number of layers," "rank," "resource," "resource set," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," "UE panel," "transmitting entity," "receiving entity," etc. may be used interchangeably.

[0411] In the present disclosure, the term "antenna port" may be interchangeably read as an antenna port for any signal / channel (e.g., a demodulation reference signal (DMRS) port). In the present disclosure, the term "resource" may be interchangeably read as a resource for any signal / channel (e.g., a reference signal resource, an SRS resource, etc.). The resource may include time / frequency / code / space / power resources. Furthermore, the spatial domain transmission filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.

[0412] The group may include, for example, at least one of a spatial relationship group, a Code Division Multiplexing (CDM) group, a Reference Signal (RS) group, a Control Resource Set (CORESET) group, a PUCCH group, an antenna port group (e.g., a DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, and the like.

[0413] In addition, in the present disclosure, beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, codeword (CW), transport block (TB), RS, etc. may be read as interchangeable terms.

[0414] In addition, in the present disclosure, the terms TCI state, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, joint TCI state, etc. may be read interchangeably.

[0415] Furthermore, in the present disclosure, terms such as "QCL," "QCL assumption," "QCL relationship," "QCL type information," "QCL property / properties," "specific QCL type (e.g., Type A, Type D) property," and "specific QCL type (e.g., Type A, Type D)" may be interchangeable.

[0416] In the present disclosure, terms such as index, identifier (ID), indicator, indication, and resource ID may be interchangeable. In the present disclosure, terms such as sequence, list, set, group, cluster, and subset may be interchangeable.

[0417] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interchangeable. The "spatial relationship information (TCI state)" may be interchangeable with "set of spatial relationship information (TCI state)", "one or more pieces of spatial relationship information", etc. The TCI state and the TCI may be interchangeable. The spatial relationship information and the spatial relationship may be interchangeable.

[0418] In the present disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0419] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0420] In the present disclosure, a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control / operate based on the information.

[0421] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0422] 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.

[0423] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0424] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0425] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0426] 16 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0427] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0428] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0429] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0430] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0431] The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0432] The driving assistance system unit 64 includes various devices for providing functions to prevent accidents and reduce the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0433] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0434] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Furthermore, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (or may function as at least one of the base station 10 and the user terminal 20).

[0435] The communication module 60 may transmit at least one of signals from the above-mentioned various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above-mentioned input.

[0436] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle. The information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0437] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0438] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple 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, "sidelink"). For example, terms such as an uplink channel and a downlink channel may be read as a sidelink channel.

[0439] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0440] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal 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), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0441] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed 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.

[0442] Each aspect / embodiment described in the present disclosure may be a technology other than Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802. The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0443] 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."

[0444] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. 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 in some way precede the second element.

[0445] 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, etc.

[0446] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0447] Furthermore, "determination" may be considered to be "determining" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "determining" some kind of action. In the present disclosure, "determination" may be read interchangeably with the above-mentioned actions.

[0448] Furthermore, in this disclosure, "determine / determining" may be interchangeably read as "assume / assuming," "expect / expecting," "consider / considering," etc. Furthermore, in this disclosure, "does not expect to do..." may be interchangeably read as "assumes not to do...."

[0449] In the present disclosure, "expect" may be interchangeably read as "be expected." For example, "expect(s) ..." ("..." may be expressed, for example, as a that clause, a to-infinitive, etc.) may be interchangeably read as "be expected ..." or "do ... (if the above "..." is a to-infinitive, a verb with "to")," etc. "does not expect ..." may be interchangeably read as "be not expected ..." or "does not ... (if the above "..." is a to-infinitive, a verb with "to")," etc. Furthermore, "An apparatus A is not expected ..." may be interchangeably read as "an apparatus B other than apparatus A does not expect ... from apparatus A" (for example, if apparatus A is a UE, apparatus B may be a base station).

[0450] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0451] 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 elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0452] 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, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0453] 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."

[0454] 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." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0455] In this disclosure, where articles are 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.

[0456] In the present disclosure, terms such as "less than or equal to," "less than," "greater than," "more than," "equal to," etc. may be interchangeable. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative, as expressions with "i-th" (i is an arbitrary integer) attached (for example, "highest" may be interchangeable with "i-th highest").

[0457] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0458] In the present disclosure, terms such as "when A, B," "if A, (then) B," "B upon A," "B in response to A," "B based on A," "B during / while A," "B before A," "B at (the same time as) / on A," "B after A," "B since A," and "B until A" may be interchangeable. Note that A, B, and the like herein may be replaced with appropriate expressions such as nouns, gerunds, and regular sentences, depending on the context. Note that the time difference between A and B may be approximately zero (immediately after or immediately before). A time offset may also be applied to the time at which A occurs. For example, "A" may be interchangeable with "before / after a time offset at which A occurs." The time offset (eg, one or more symbols / slots) may be predefined or may be specified by the UE based on signaled information.

[0459] In the present disclosure, timing, time, duration, time instance, any time unit (e.g., slot, subslot, symbol, subframe), period, occasion, resource, etc. may be read interchangeably.

[0460] 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 description of the present disclosure is for illustrative purposes only and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A terminal including: a receiving unit that receives information indicating a plurality of candidate synchronization signal blocks (SSBs) and some of the plurality of candidate SSBs; and a control unit that controls reception of the SSBs based on the information.

2. The terminal of claim 1, wherein the receiver further receives information indicating random access channel (RACH) resources associated with the plurality of candidate SSBs or the portion of the SSBs.

3. The terminal according to claim 1, wherein the control unit controls transmission of additional transmission requests for SSBs other than the part of the SSBs among the plurality of candidate SSBs.

4. The terminal of claim 1, wherein the receiver further receives information indicating channel state information reference signal (CSI-RS) resources associated with the plurality of candidate SSBs or the portion of the SSBs.

5. A wireless communication method for a terminal, comprising: a step of receiving information indicating a plurality of candidate synchronization signal blocks (SSBs) and some of the plurality of candidate SSBs; and a step of controlling reception of the SSBs based on the information.

6. A base station including: a transmitting unit that transmits information indicating a plurality of candidate synchronization signal blocks (SSBs) and some of the SSBs among the plurality of candidate SSBs; and a control unit that controls the transmission of the SSBs based on the information.

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