Terminal, wireless communication method, base station and system

Abstract

A terminal according to one embodiment of the present disclosure has: a control unit that determines a physical downlink control channel (PDCCH) to be monitored, among PDCCHs in a plurality of temporally overlapping control resource sets (CORESETs), in accordance with the transmission configuration indication state (TCI state) of only one CORESET selected on the basis of a priority rule; and a reception unit that monitors the determined PDCCH. According to an embodiment of the present disclosure, collision among a plurality of PDCCHs can be appropriately coped with.

Description

[Technical Field]

[0001] The present disclosure relates to a terminal and a wireless communication method in a next-generation mobile communication system. law, basis earth Stations and systems Regarding. [Background technology]

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) was specified with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) was specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

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

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

[0005] The previous Rel.15 / 16 NR specifications specified constraints (also called priority rules) to ensure that multiple channels / signals fall into the same Quasi-Co-Location (QCL) Type D in the case of collision, or to avoid such cases.

[0006] In addition, in NR, it is being considered that one or more transmission / reception points (TRPs) (multi-TRPs (MTRPs)) perform DL transmission to a terminal (user equipment, User Equipment (UE)). It is also being considered that a UE performs UL transmission to one or more TRPs.

[0007] In addition, in preparation for Rel.17 NR, support for simultaneous reception of multiple QCL type D channels / signals by UEs is being considered. However, there has been no progress in studying how to control collisions in the downlink control channel when a UE can simultaneously receive multiple QCL type D channels / signals. If this issue is not addressed, UE transmission and reception may be inappropriately restricted, resulting in a decrease in throughput or degradation of communication quality.

[0008] Therefore, the present disclosure provides a terminal and a wireless communication method that can appropriately deal with collisions of multiple downlink control channels. law, basis earth Stations and systems One of the aims is to provide [Means for solving the problem]

[0009] A terminal according to one aspect of the present disclosure includes: , complex Control Resource Set (CORESET) The overlapping timePhysical Downlink Control Channel (PDCCH) ) Monitoring opportunities PDCC monitors Candidate H , selected based on priority rules one of the plurality of CORESETs Only one The first C ORESET Transmission Configuration Indication state (TCI state) ) for the spatial receiving parameters of the QCL type A control unit that determines the determined PDCC Candidate H a receiving unit for monitoring; and when the plurality of CORESETs are CORESETs of a single frequency network (SFN), the control unit monitors the PDCCH candidates in the first CORESET and a second CORESET among the plurality of CORESETs that is different from the first CORESET, and the PDCCH candidates monitored in the second CORESET are determined according to the same QCL type as the QCL type. . [Effects of the Invention]

[0010] According to one aspect of the present disclosure, it is possible to appropriately deal with collisions among multiple downlink control channels. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing an example of a priority CORESET and other CORESETs to be monitored simultaneously in embodiment 1.1.1. [Figure 2] FIG. 2 is a diagram showing an example of a priority CORESET in embodiment 1.1.2.1. [Figure 3] FIG. 3 is a diagram showing an example of a prioritized CORESET in embodiment 1.1.2.1. [Figure 4] FIG. 4 is a diagram showing an example of a prioritized CORESET in embodiment 1.1.2.1. [Figure 5] FIG. 5 is a diagram showing an example of a prioritized CORESET in embodiment 1.1.2.2. [Figure 6] FIG. 6 is a diagram showing an example of a priority CORESET and other CORESETs to be monitored simultaneously in embodiment 1.1.2. [Figure 7] FIG. 7 is a diagram showing an example of a priority CORESET and other CORESETs to be monitored simultaneously in embodiment 1.1.2. [Figure 8]FIG. 8 is a diagram showing an example of a priority CORESET and other CORESETs monitored simultaneously in embodiment 1.2. [Figure 9] FIG. 9 is a diagram showing an example of a priority CORESET and other CORESETs to be monitored simultaneously in embodiment 2.1.1. [Figure 10] FIG. 10 is a diagram showing an example of a prioritized CORESET in embodiment 2.1.2.1. [Figure 11] FIG. 11 is a diagram showing an example of a prioritized CORESET in embodiment 2.1.2.2. [Figure 12] FIG. 12 is a diagram showing an example of a priority CORESET and other CORESETs to be monitored simultaneously in embodiment 2.1.2. [Figure 13] FIG. 13 is a diagram showing an example of a priority CORESET and other CORESETs monitored simultaneously in embodiment 2.2. [Figure 14] FIG. 14 is a diagram showing an example of another CORESET that is monitored simultaneously with a priority CORESET having two TCI states. [Figure 15] FIG. 15 is a diagram showing an example of another CORESET being monitored simultaneously with a preferred CORESET having only one TCI state. [Figure 16] FIG. 16 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 17] FIG. 17 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 18] FIG. 18 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 19] FIG. 19 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. [Figure 20] FIG. 20 is a diagram illustrating an example of a vehicle according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] (TCI, spatial relations, QCL) In NR, it is being considered to control 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) in the UE of at least one of a signal and a channel (referred to as signal / channel) based on the transmission configuration indication state (TCI state).

[0013] The TCI state may represent that which is applied to a downlink signal / channel, and the equivalent of the TCI state which is applied to an uplink signal / channel may be expressed as a spatial relation.

[0014] 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.

[0015] A QCL is an index that indicates the statistical properties of a signal / channel. 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 the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is the same between these different signals / channels (i.e., they are QCLs with respect to at least one of these).

[0016] The spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be determined based on a spatial QCL. A QCL (or at least one element of a QCL) in the present disclosure may be replaced with an sQCL (spatial QCL).

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

[0018] The assumption by a UE 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.

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

[0020] The TCI state may be, for example, information about the QCL between the target channel (in other words, the Reference Signal (RS) for the 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.

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

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

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

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

[0025] 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)).

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

[0027] An SSB is a signal block that includes 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.

[0028] An RS of QCL type X in a TCI state may refer to an RS that has a relationship of QCL type X with (the DMRS of) a certain channel / signal, and this RS may be called a QCL source of QCL type X in the TCI state.

[0029] (multiple channels / signal collisions) In the previous Rel.15 / 16 NR specifications, a UE could only receive, detect, or monitor channels / signals of the same QCL type D at the same time, but could not receive, detect, or monitor multiple channels / signals of different QCL types D at the same time. For this reason, the Rel.15 / 16 NR specifications specify the following constraints (which may also be called priority rules, QCL application rules, etc.) to ensure that multiple channels / signals fall under the same QCL type D when they collide (in other words, are transmitted / received at overlapping times) or to avoid such cases.

[0030] In this disclosure, the collision of multiple channels / signals may mean that multiple channels / signals of different QCL types D are scheduled (or configured) to be received (or transmitted) in the same time resource (period).

[0031] Furthermore, in this disclosure, a difference between (the reference RS of) a QCL type D of one channel / signal and (the reference RS of) a QCL type D of another channel / signal may mean that the beam used for communication of the one channel / signal is different from the beam used for communication of the other channel / signal. In this disclosure, a difference between (the reference RS of) a QCL type D of one channel / signal and (the reference RS of) a QCL type D of another channel / signal may be expressed as the QCL types D of the one channel / signal and the other channel / signal being different, their QCL type D characteristics being different, "QCL types D" being different, etc.

[0032] <PDCCH vs. PDCCH> When a UE is configured for single-cell operation or for carrier aggregation operation in the same frequency band, and monitors PDCCH candidates in multiple CORESETs with the same or different QCL type D characteristics in the active DL BWP of one or more cells at overlapping monitoring occasions, it monitors PDCCHs only in a certain CORESET among the multiple CORESETs and in a CORESET that has the same QCL type D characteristics as the certain CORESET.

[0033] This "certain CORESET" corresponds to the lowest-indexed Common Search Space (CSS) set in the lowest-indexed cell that contains the CSS set, if any, or the lowest-indexed UE-specific Search Space (USS) set in the lowest-indexed cell, if any. The lowest USS set index is determined across all USS sets that have at least one PDCCH candidate in overlapping PDCCH monitoring occasions.

[0034] In simple terms, when monitoring PDCCH candidates at overlapping monitoring opportunities, the UE determines the CORESET to monitor according to the priority rule that CSS sets are monitored with priority over USS sets, and among SS sets of the same type (CSS or USS), the one with the smaller index (i.e., the smaller cell index; if the cell index is the same, the one with the smaller SS set index) is monitored with priority.

[0035] The SS set index may correspond to a value set by the RRC parameter SearchSpaceId for identifying a search space. In the present disclosure, the CSS set index may refer to the SS set index for an SS set whose search space type (RRC parameter "searchSpaceType") indicates CSS. In the present disclosure, the USS set index may refer to the SS set index for an SS set whose search space type (RRC parameter "searchSpaceType") indicates USS.

[0036] (Multi-TRP) For PDCCH / CORESET defined in Rel. 15, one TCI state without a CORESET pool index (CORESETPoolIndex) is set to one CORESET.

[0037] In NR, it is considered that one or more transmission / reception points (TRPs) (multi-TRPs (MTRPs)) perform DL transmission to a UE. It is also considered that a UE performs UL transmission to one or more TRPs.

[0038] Regarding the enhancement of PDCCH / CORESET specified in Rel. 16, in multi-TRP based on multi-DCI, a CORESET pool index is set for each CORESET.

[0039] In Rel. 17 and later, it is assumed that PDCCH repetition is applied to PDCCHs (or DCIs) transmitted from one or more TRPs. For example, it is conceivable that multiple PDCCHs (or DCIs) transmitted from one or more TRPs are used to schedule or instruct transmission / reception of one or more signals / channels.

[0040] A PDCCH / DCI to which repeated transmission is applied may be called a multi-PDCCH / multi-DCI. Repeated transmission of a PDCCH may be interchangeably read as PDCCH repetition, multiple transmission of a PDCCH, multi-PDCCH transmission or multiple PDCCH transmission, MTR PDCCH, etc.

[0041] Multiple PDCCHs / DCIs may be transmitted from different TRPs, and the multiple PDCCHs / DCIs may be multiplexed using time division multiplexing (TDM), frequency division multiplexing (FDM), or space division multiplexing (SDM).

[0042] For example, when PDCCH repetition is performed using TDM (TDM PDCCH repetition), PDCCHs may be transmitted from multiple TRPs using different time resources.

[0043] In the case of FDM PDCCH repetition, PDCCHs may be transmitted from multiple TRPs using different frequency-time resources. In the FDM PDCCH repetition, at least one of the following may be associated with different TCI states: two sets of resource element groups (REGs), two sets of control channel elements (CCEs) of the transmitted PDCCH, two non-overlapping transmitted PDCCH repetitions in frequency, and two non-overlapping multi-chance transmitted PDCCHs in frequency.

[0044] When SDM PDCCH repetition is performed, PDCCHs may be transmitted from multiple TRPs using the same time / frequency resources. In SDM PDCCH repetition, PDCCH DMRSs in all REGs / CCEs of the PDCCH may be associated with two TCI states. In this disclosure, SDM may be interchangeably read as single frequency network (SFN).

[0045] For example, in the case where multiple antennas (small antennas, transmission / reception points) having the same cell ID form an SFN, up to two TCI states may be set / activated for one CORESET by higher layer signaling (RRC signaling / MAC CE). The SFN may contribute to at least one of the operation and reliability improvement of high speed trains (HST).

[0046] In addition, in non-SFN PDCCH repetition, two PDCCH candidates in two search space sets may be linked, and each search space set may be associated with a corresponding CORESET. The two search space sets may be associated with the same or different CORESETs. For one CORESET, one (maximum one) TCI state may be configured / activated by higher layer signaling (RRC signaling / MAC CE).

[0047] If two search space sets are associated with different CORESETs with different TCI states, this may mean a multi-TRP repeat transmission. If two search space sets are associated with the same CORESET (CORESET with the same TCI state), this may mean a single-TRP repeat transmission.

[0048] A UE to which FDM / SDM PDCCH repetition is applied should be able to simultaneously receive multiple beams (multiple QCL type D channels / signals). However, there has been no study yet on whether or not to follow the above-mentioned constraints (priority rules) when controlling PDCCH collisions when a UE can simultaneously receive multiple beams (multiple QCL type D channels / signals). If this issue is not addressed, UE transmission and reception may be inappropriately restricted, resulting in a decrease in throughput or degradation of communication quality.

[0049] Therefore, the present inventors came up with the idea of ​​control that can appropriately deal with collisions between multiple PDCCHs.

[0050] 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.

[0051] 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."

[0052] In the present disclosure, terms such as 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.

[0053] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, information elements (IEs), configurations, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0054] In the present disclosure, higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like, or a combination thereof.

[0055] 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.

[0056] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0057] In this disclosure, the terms index, identifier (ID), indicator, resource ID, etc. may be interchangeable. In this disclosure, the terms sequence, list, set, group, cluster, subset, etc. may be interchangeable.

[0058] In this disclosure, the terms panel, UE panel, panel group, beam, beam group, precoder, Uplink (UL) transmitting entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relation, SRS Resource Indicator (SRI), Control Resource Set (CORESET), Physical Downlink Shared Channel (PDSCH), Codeword (CW), Transport Block (TB), Reference Signal (RS), antenna port (e.g., Demodulation Reference Signal (DMRS) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relation group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) group, PUCCH resource group), resource (e.g., reference signal resource, SRS resource), resource set (e.g., reference signal resource set), CORESET pool, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, Quasi-Co-Location (QCL), QCL assumption, etc. may be read as interchangeable.

[0059] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and spatial relationship information (TCI state) may be interchangeable. "Spatial relationship information" may be interchangeable with "set of spatial relationship information," "one or more pieces of spatial relationship information," etc. The TCI state and TCI may be interchangeable with each other.

[0060] The panel may be associated with at least one of a group index of an SSB / CSI-RS group, a group index of a group-based beam report, and a group index of an SSB / CSI-RS group for group-based beam reporting.

[0061] In this disclosure, a single PDCCH may be assumed to be supported when multiple TRPs utilize an ideal backhaul, and multiple PDCCHs may be assumed to be supported when multiple TRPs utilize a non-ideal backhaul.

[0062] The ideal backhaul may be called DMRS port group type 1, reference signal associated group type 1, antenna port group type 1, CORESET pool type 1, etc. The non-ideal backhaul may be called DMRS port group type 2, reference signal associated group type 2, antenna port group type 2, CORESET pool type 2, etc. The names are not limited to these.

[0063] In the present disclosure, multi-TRP, multi-TRP system, multi-TRP transmission, and multi-PDSCH may be read as interchangeable.

[0064] In the present disclosure, single DCI (sDCI), single PDCCH, multi-TRP system based on single DCI, sDCI-based MTRP, and activation of two TCI states on at least one TCI codepoint may be read interchangeably.

[0065] In the present disclosure, multi-DCI (mDCI), multi-PDCCH, multi-TRP system based on multi-DCI, mDCI-based MTRP, and setting two CORESET pool indices or CORESET pool index=1 (or a value greater than or equal to 1) may be read interchangeably.

[0066] The QCL of the present disclosure may be interchangeably read as QCL Type D.

[0067] Note that the following embodiments are described assuming that they are applied when the UE supports simultaneous reception of two or more different QCL Type D channels / signals, but may also be applied in other cases.

[0068] In the present disclosure, expressions such as "TCI state A is QCL type D, which is the same as TCI state B," "TCI state A is the same as TCI state B," and "TCI state A is QCL type D with TCI state B" may be read interchangeably.

[0069] In the present disclosure, overlapping of multiple CORESETs may mean that monitoring opportunities for the multiple CORESETs overlap. In the present disclosure, overlapping of multiple CORESETs may mean that monitoring opportunities for the multiple CORESETs exist in the same symbol within a bandwidth part (BWP) / component carrier (CC) / band / frequency range / UE (note that within a UE may be interpreted as within all frequencies / all bands, etc.). Furthermore, in the present disclosure, a CORESET having a TCI state may mean a CORESET in which the TCI state is activated (or has an active TCI state or is instructed to be an active TCI state). Furthermore, in the present disclosure, a CORESET having one TCI state may mean a CORESET having only one TCI state.

[0070] (Wireless communication method) First Embodiment The first embodiment relates to an SFN PDCCH repetition scheme.

[0071] In the first embodiment, one or more TCI states may be activated per CORESET. The activation of a TCI state for a CORESET may be signaled to the UE using the MAC CE.

[0072] In the first embodiment, in a case where multiple PDCCHs of different QCL types D collide, the UE determines the PDCCH (CORESET) to monitor based on at least one priority rule shown in embodiments 1.1 to 1.3. Each of these will be described below.

[0073] Hereinafter, in this disclosure, the CORESET to be monitored determined based on the priority rule will also be simply referred to as a "prioritized CORESET," a CORESET with the highest priority, or the like.

[0074] [Embodiment 1.1] The priority rule in embodiment 1.1 is the same as that in Rel.16 NR. That is, the UE determines the preferred CORESET according to the priority rule that the CSS set is monitored with priority over the USS set, and among SS sets of the same type (CSS or USS), the one with the smaller index (i.e., the one with the smaller cell index; if the cell index is the same, the one with the smaller SS set index) is monitored with priority.

[0075] Embodiment 1.1 is further divided into the following two categories: Embodiment 1.1.1: The preferred CORESET has two active TCI states (two QCL type D); · Embodiment 1.1.2: The preferred CORESET has one active TCI state (one QCL type D).

[0076] [[Embodiment 1.1.1]] For a CORESET other than the preferred CORESET that has one active TCI state, the UE may monitor this CORESET if the one active TCI state is of the same QCL type D as one of the two active TCI states of the preferred CORESET.

[0077] For a CORESET other than the Preferred CORESET that has two active TCI states, the UE may monitor this CORESET if either (1.1.1a) or (1.1.1b) of the following conditions is met: (1.1.1a) The two active TCI states are the same QCL type D as the two active TCI states of the preferred CORESET; (1.1.1b) One of the two active TCI states is the same QCL type D as one of the two active TCI states of the preferred CORESET.

[0078] Note that if the above (1.1.1b) is satisfied, the UE applies only the TCI state that is the same QCL type D as one of the two active TCI states of the preferred CORESET to monitor the above CORESET.

[0079] 1 is a diagram showing an example of a priority CORESET and other CORESETs monitored simultaneously in embodiment 1.1.1. In this example, four CORESETs (CORESET#1-#4) overlap in time.

[0080] CORESET#1 corresponds to CSS set index=0 and cell index=0 and has two active TCI states (TCI states #1 and #2).

[0081] CORESET#2 corresponds to USS set index=1 and cell index=0 and has one active TCI state (TCI state#2).

[0082] CORESET#3 corresponds to USS set index=2 and cell index=0 and has two active TCI states (TCI states #1 and #2).

[0083] CORESET#4 corresponds to USS set index=3 and cell index=0 and has two active TCI states (TCI states #1 and #3).

[0084] In the case of Fig. 1, the UE first selects CORESET#1 corresponding to the CSS set as the preferred CORESET. Since CORESET#1 has two active TCI states, the operation is as in embodiment 1.1.1.

[0085] One TCI state of CORESET#2 is QCL type D, which is the same as TCI state#2 of the preferred CORESET, so the UE monitors CORESET#2.

[0086] The UE monitors CORESET#3 because the two TCI states of CORESET#3 are QCL type D, the same as TCI states #1 and #2 of the preferred CORESET.

[0087] One of the two TCI states of CORESET#4 is QCL type D, the same as TCI state #1 of the preferred CORESET, but the other is QCL type D (TCI state #3), which is different from TCI state #2 of the preferred CORESET. Therefore, a UE that complies with (1.1.1a) above does not monitor CORESET#4. A UE that complies with (1.1.1b) above monitors CORESET#4 by applying only TCI state #1.

[0088] [[Embodiment 1.1.2]] In embodiment 1.1.2, a preferred CORESET having one active TCI state, which is first determined according to the same priority rule as Rel.16 NR, is also referred to as a first preferred CORESET, and a preferred CORESET other than the first preferred CORESET, which is subsequently determined, is also referred to as a second preferred CORESET. The second preferred CORESET may be referred to as CORESET X.

[0089] One active TCI state of the first priority CORESET may be referred to as a first priority TCI state, and any active TCI state of the second priority CORESET may be referred to as a second priority TCI state.

[0090] Embodiment 1.1.2 is roughly divided into embodiments 1.1.2.1 and 1.1.2.2 depending on the method for determining the second priority CORESET.

[0091] [[Embodiment 1.1.2.1]] The second preferred CORESET may be determined from the remaining conflicting CORESETs excluding the first preferred CORESET according to the same priority rules as in Rel. 16. That is, the second preferred CORESET may correspond to the CSS set with the smallest index in the cell with the smallest index that contains a CSS set, if any, among the remaining conflicting CORESETs, or the USS set with the smallest index in the cell with the smallest index. The smallest USS set index is determined across all USS sets that have at least one PDCCH candidate in overlapping PDCCH monitoring occasions.

[0092] If a candidate for the second preferred CORESET derived according to the above priority rule has only one active TCI state, and if the active TCI state is the same as the first preferred TCI state, the UE may search for the next candidate (the CORESET corresponding to the SS set / cell with the next smallest index) as a candidate for the second preferred CORESET. That is, for a CORESET that has only one active TCI state, the UE may continue searching for the second preferred CORESET until the active TCI state differs from the first preferred TCI state.

[0093] If the UE finds a CORESET that has only one active TCI state that is different from the first preferred TCI state according to the above priority rules, the UE may determine this active TCI state as the second preferred TCI state and determine this CORESET as the second preferred CORESET.

[0094] In addition, even if a candidate for the second preferred CORESET derived according to the priority rule has only one active TCI state and the active TCI state is the same as the first preferred TCI state, the UE may determine this active TCI state as the second preferred TCI state and determine this candidate as the second preferred CORESET. In this case, since the second preferred CORESET is the same as the first preferred CORESET, it may be expressed as there being no second preferred CORESET.

[0095] If a candidate for a second preferred CORESET derived according to the above priority rule has two active TCI states, and one of the two active TCI states is the same as the first preferred TCI state, the UE may determine the other of the two active TCI states as the second preferred TCI state, or may determine this candidate as the second preferred CORESET.

[0096] Furthermore, when a candidate for the second preferred CORESET derived according to the priority rule has two active TCI states, and both of the two active TCI states are different from the first preferred TCI state, the UE may determine one of the two active TCI states as the second preferred TCI state or may determine this candidate as the second preferred CORESET. This one TCI state may be the one with the smallest or largest TCI state ID among the two active TCI states, or may be the one corresponding to the first or second TCI state activated by the MAC CE.

[0097] 2 is a diagram showing an example of a prioritized CORESET in embodiment 1.1.2.1. In this example, three CORESETs (CORESET#1-#3) overlap in time.

[0098] CORESET#1 corresponds to CSS set index=0 and cell index=0 and has one active TCI state (TCI state#1).

[0099] CORESET#2 corresponds to USS set index=1 and cell index=0 and has one active TCI state (TCI state#1).

[0100] CORESET#3 corresponds to USS set index=2 and cell index=0 and has one active TCI state (TCI state#2).

[0101] In the case of Figure 2, the UE first selects CORESET#1 corresponding to the CSS set as a preferred CORESET. Since CORESET#1 has one active TCI state, the operation is as in embodiment 1.1.2. This preferred CORESET corresponds to the first preferred CORESET, and TCI state#1 corresponds to the first preferred TCI state.

[0102] Next, the UE searches for a second preferred CORESET. Since one TCI state of CORESET#3 is different from TCI state#1 of the preferred CORESET, the UE determines this TCI state#2 as the second preferred TCI state and determines CORESET#3 as the second preferred CORESET to monitor.

[0103] 3 is a diagram showing an example of a prioritized CORESET in embodiment 1.1.2.1. In this example, two CORESETs (CORESET#1-#2) overlap in time.

[0104] CORESET#1 corresponds to CSS set index=0 and cell index=0 and has one active TCI state (TCI state#1).

[0105] CORESET#2 corresponds to USS set index=1 and cell index=0 and has two active TCI states (TCI states #1 and #2).

[0106] In the case of Figure 3, the UE first selects CORESET#1 corresponding to the CSS set as the preferred CORESET. Since CORESET#1 has one active TCI state, the operation is as in embodiment 1.1.2. This preferred CORESET corresponds to the first preferred CORESET, and TCI state#1 corresponds to the first preferred TCI state.

[0107] Next, the UE searches for a second prioritized CORESET. Since one of the two active TCI states of CORESET#2 is the same as the first prioritized TCI state, the UE determines the other of the two active TCI states (TCI state#2) as the second prioritized TCI state and determines CORESET#2 as the second prioritized CORESET to monitor.

[0108] 4 is a diagram showing an example of a prioritized CORESET in embodiment 1.1.2.1. In this example, two CORESETs (CORESET#1-#2) overlap in time.

[0109] CORESET#1 corresponds to CSS set index=0 and cell index=0 and has one active TCI state (TCI state#1).

[0110] CORESET#2 corresponds to USS set index=1 and cell index=0 and has two active TCI states (TCI states #3 and #2).

[0111] In the case of Figure 4, the UE first selects CORESET#1 corresponding to the CSS set as a preferred CORESET. Since CORESET#1 has one active TCI state, the operation is as in embodiment 1.1.2. This preferred CORESET corresponds to the first preferred CORESET, and TCI state#1 corresponds to the first preferred TCI state.

[0112] Next, the UE searches for a second preferred CORESET. Since both of the two active TCI states of CORESET#2 are different from the first preferred TCI state, the UE determines the TCI state with the largest TCI state ID (TCI state#3) of the two active TCI states as the second preferred TCI state, determines CORESET#2 as the second preferred CORESET, and applies only TCI state#3 to CORESET#2 to monitor PDCCH candidates.

[0113] [[Embodiment 1.1.2.2]] From the remaining conflicting CORESETs excluding the first preferred CORESET, the UE first determines a subset of CORESETs that have two active TCI states, one of which is the same as the first preferred TCI state.

[0114] The UE then determines a second preferred CORESET from the subset according to the same priority rules as in Rel. 16. That is, the second preferred CORESET may correspond to the CSS set with the smallest index in the cell with the smallest index that contains a CSS set, if any, among the CORESETs included in the subset, or may correspond to the USS set with the smallest index in the cell with the smallest index. The smallest USS set index is determined across all USS sets that have at least one PDCCH candidate in overlapping PDCCH monitoring occasions.

[0115] The second priority TCI state corresponds to an active TCI state of the second priority CORESET that is different from the first priority TCI state.

[0116] In embodiment 1.1.2.2, in the second preferred CORESET, PDCCH candidates (CORESET) can be monitored using both the first preferred TCI and the second preferred TCI state.

[0117] 5 is a diagram showing an example of a prioritized CORESET in embodiment 1.1.2.2. In this example, four CORESETs (CORESET#1-#4) overlap in time.

[0118] CORESET#1 corresponds to CSS set index=0 and cell index=0 and has one active TCI state (TCI state#1).

[0119] CORESET#2 corresponds to USS set index=1 and cell index=0 and has one active TCI state (TCI state#3).

[0120] CORESET#3 corresponds to USS set index=2 and cell index=0 and has two active TCI states (TCI states #3 and #4).

[0121] CORESET#4 corresponds to USS set index=3 and cell index=0 and has two active TCI states (TCI states #1 and #2).

[0122] In the case of Figure 5, the UE first selects CORESET#1 corresponding to the CSS set as a preferred CORESET. Since CORESET#1 has one active TCI state, the operation is as in embodiment 1.1.2. This preferred CORESET corresponds to the first preferred CORESET, and TCI state#1 corresponds to the first preferred TCI state.

[0123] Next, the UE searches for a second-priority CORESET. Of the remaining CORESETs #2-#4, CORESET #4 is the only CORESET that has two active TCI states, one of which is the same as the first-priority TCI state. Therefore, the UE determines TCI state #2 of CORESET #4, which is different from the first-priority TCI state, as the second-priority TCI state, determines CORESET #4 as the second-priority CORESET, and applies TCI states #1 and #2 to CORESET #4 to monitor PDCCH candidates.

[0124] [[CORESET other than the preferred CORESET]] The monitoring of CORESETs other than the priority CORESETs (first priority CORESET and second priority CORESET) in embodiment 1.1.2 will be described.

[0125] For a CORESET other than the Preferred CORESET that has one active TCI state, the UE may monitor this CORESET if either (1.1.2a) or (1.1.2b) of the following conditions is met: (1.1.2a) The one active TCI state is the same QCL type D as the first priority TCI state; (1.1.2b) The one active TCI state is of the same QCL type D as the first priority TCI state or the second priority TCI state.

[0126] 6 is a diagram showing an example of a prioritized CORESET and other CORESETs monitored simultaneously in embodiment 1.1.2. In this example, three CORESETs (CORESET#1-#3) overlap in time.

[0127] CORESET#1 corresponds to CSS set index=0 and cell index=0 and has one active TCI state (TCI state#1).

[0128] CORESET#2 corresponds to USS set index=3 and cell index=0 and has two active TCI states (TCI states #1 and #2).

[0129] CORESET#3 corresponds to USS set index=4 and cell index=0 and has one active TCI state (TCI state#2).

[0130] In the case of Figure 6, the UE first selects CORESET#1 corresponding to the CSS set as a preferred CORESET. Since CORESET#1 has one active TCI state, the operation is as in embodiment 1.1.2. This preferred CORESET corresponds to the first preferred CORESET, and TCI state#1 corresponds to the first preferred TCI state.

[0131] Next, the UE searches for a second-priority CORESET. Of the remaining CORESETs #2-#3, CORESET #2 is the only CORESET that has two active TCI states, one of which is the same as the first-priority TCI state. Therefore, the UE determines TCI state #2 of CORESET #2, which is different from the first-priority TCI state, as the second-priority TCI state, determines CORESET #2 as the second-priority CORESET, and applies TCI states #1 and #2 to CORESET #2 to monitor PDCCH candidates.

[0132] If the UE considers condition (1.1.2a), it does not monitor CORESET#3. If the UE considers condition (1.1.2b), it monitors CORESET#3.

[0133] For a CORESET other than the Preferred CORESET that has two active TCI states, the UE may monitor this CORESET if the following condition (1.1.2c) or (1.1.2d) or (1.1.2e) is met: (1.1.2c) The two active TCI states are the same QCL type D as the first priority TCI state and the second priority TCI state; (1.1.2d) One of the two active TCI states is of QCL type D, the same as the first preferred TCI state; (1.1.2e) One of the two active TCI states is the same QCL type D as either the first priority TCI state or the second priority TCI state.

[0134] If the above (1.1.2d) is satisfied, the UE applies only the TCI state of QCL type D, which is the same as the first priority TCI state, to monitor the CORESET.

[0135] If the above (1.1.2e) is satisfied, the UE applies only the TCI state that is the same QCL type D as either the first priority TCI state or the second priority TCI state and monitors the CORESET.

[0136] 7 is a diagram showing an example of a prioritized CORESET and other CORESETs monitored simultaneously in embodiment 1.1.2. In this example, four CORESETs (CORESETs #1 to #4) overlap in time.

[0137] CORESET#1 corresponds to CSS set index=0 and cell index=0 and has one active TCI state (TCI state#1).

[0138] CORESET#2 corresponds to USS set index=3 and cell index=0 and has two active TCI states (TCI states #1 and #2).

[0139] CORESET#3 corresponds to USS set index=4 and cell index=0 and has two active TCI states (TCI states #1 and #3).

[0140] CORESET#4 corresponds to USS set index=5 and cell index=0 and has two active TCI states (TCI states #3 and #2).

[0141] In the case of Figure 7, the UE first selects CORESET#1 corresponding to the CSS set as a preferred CORESET. Since CORESET#1 has one active TCI state, the operation is as in embodiment 1.1.2. This preferred CORESET corresponds to the first preferred CORESET, and TCI state#1 corresponds to the first preferred TCI state.

[0142] Next, the UE searches for a second preferred CORESET. Of the remaining CORESETs #2-#4, CORESETs that have two active TCI states, one of which is the same as the first preferred TCI state, are CORESETs #2 and #3. The UE determines CORESET #2, which has a smaller SS set index, as the second preferred CORESET. The UE determines TCI state #2, which is different from the first preferred TCI state, as the second preferred TCI state among the TCI states of CORESET #2, and applies TCI states #1 and #2 to monitor PDCCH candidates in CORESET #2.

[0143] The UE does not monitor CORESET#3 when considering condition (1.1.2c). The UE monitors CORESET#3 with only TCI state #1 applied when considering condition (1.1.2d) or (1.1.2e).

[0144] The UE does not monitor CORESET#4 when considering condition (1.1.2c) or (1.1.2d). The UE monitors CORESET#4 with only TCI state #2 applied when considering condition (1.1.2e).

[0145] [Embodiment 1.2] The priority rules of embodiment 1.2 are as follows: Step 1: If there is a subset of conflicting CORESETs that have two active TCI states, apply the priority rules of Rel. 16 NR to only those. If a preferred CORESET is found, end the step. Otherwise, proceed to step 2. · Step 2: If no preferred CORESET is found in Step 1, apply the priority rules of Rel.16 NR to only the subset of conflicting CORESETs that have one active TCI state.

[0146] That is, in embodiment 1.2, the UE determines the preferred CORESET according to the priority rule that the CORESET to be monitored is determined preferentially in the following order: CSS set with two active TCI states > USS set with two active TCI states > CSS set with one active TCI state > USS set with one active TCI state.

[0147] In addition, among SS sets of the same type (CSS or USS) with the same number of active TCI states, the one with the smaller index (i.e., the one with the smaller cell index; if the cell index is the same, the one with the smaller SS set index) is selected as the preferred CORESET.

[0148] Similar to the content described in embodiment 1.1.1, a CORESET to be monitored may be determined from a CORESET other than the preferred CORESET. That is, for a CORESET other than the preferred CORESET that has one active TCI state, if the one active TCI state is the same QCL type D as one of the two active TCI states of the preferred CORESET, the UE may monitor this CORESET.

[0149] Furthermore, for a CORESET other than the preferred CORESET that has two active TCI states, the UE may monitor this CORESET if (1.1.1a) or (1.1.1b) above is satisfied.

[0150] 8 is a diagram showing an example of a priority CORESET and other CORESETs monitored simultaneously in embodiment 1.2. In this example, four CORESETs (CORESET#1-#4) overlap in time.

[0151] CORESET#1 corresponds to CSS set index=0 and cell index=0 and has one active TCI state (TCI state#1).

[0152] CORESET#2 corresponds to USS set index=1 and cell index=0 and has one active TCI state (TCI state#2).

[0153] CORESET#3 corresponds to USS set index=2 and cell index=0 and has two active TCI states (TCI states #1 and #2).

[0154] CORESET#4 corresponds to USS set index=3 and cell index=0 and has two active TCI states (TCI states #1 and #3).

[0155] In the case of FIG. 8, CORESETs having two active TCI states are CORESETs #3 and #4, and CORESET #3, which corresponds to the smaller SS set index, is selected as the preferred CORESET.

[0156] One TCI state of CORESET#1 is QCL type D, which is the same as TCI state #1 of the preferred CORESET, so the UE monitors CORESET#1.

[0157] One TCI state of CORESET#2 is QCL type D, which is the same as TCI state#2 of the preferred CORESET, so the UE monitors CORESET#2.

[0158] One of the two TCI states of CORESET#4 is QCL type D, the same as TCI state #1 of the preferred CORESET, but the other is QCL type D (TCI state #3), which is different from TCI state #2 of the preferred CORESET. Therefore, a UE that complies with (1.1.1a) above does not monitor CORESET#4. A UE that complies with (1.1.1b) above monitors CORESET#4 by applying only TCI state #1.

[0159] [Embodiment 1.3] The priority rules of embodiment 1.3 are as follows: Step 1: If there is a conflicting CORESET that has two active TCI states and corresponds to the CSS set with the smallest index in the cell with the smallest index that contains the CSS set, determine this as the dominant CORESET and end the step. Otherwise, proceed to step 2. Step 2: If there is a CORESET among the conflicting CORESETs that has one active TCI state and corresponds to the CSS set with the smallest index in the cell with the smallest index that contains the CSS set, determine this CORESET as the dominant CORESET and end the step. Otherwise, proceed to step 3. Step 3: If there is a CORESET among the conflicting CORESETs that has two active TCI states and corresponds to the USS set with the smallest index in the cell with the smallest index that contains the USS set, determine this CORESET as the preferred CORESET and end the step. Otherwise, proceed to step 4. Step 4: If there is a CORESET among the conflicting CORESETs that has one active TCI state and corresponds to the USS set with the smallest index in the cell with the smallest index that contains the USS set, determine this CORESET as the preferred CORESET and end the step.

[0160] That is, in embodiment 1.3, the UE determines the preferred CORESET according to the priority rule that the CORESET to be monitored is determined preferentially in the following order: CSS set with two active TCI states > CSS set with one active TCI state > USS set with two active TCI states > USS set with one active TCI state.

[0161] In addition, among SS sets of the same type (CSS or USS) with the same number of active TCI states, the one with the smaller index (i.e., the one with the smaller cell index; if the cell index is the same, the one with the smaller SS set index) is selected as the preferred CORESET.

[0162] When a preferred CORESET is determined in the above step 1 or 3, the UE may determine a CORESET to further monitor from among CORESETs other than the preferred CORESET based on embodiment 1.1.1.

[0163] When a preferred CORESET is determined in the above step 2 or 4, the UE may determine a CORESET to further monitor from among CORESETs other than the preferred CORESET based on embodiment 1.1.2.

[0164] Note that the CORESET corresponding to the Type 0-PDCCH CSS set (in other words, the CSS set for receiving system information) has always had the highest priority under the priority rules of the existing Rel. 15 / 16 NR because its SS set index is 0. However, under the priority rules of embodiment 1.3, the CORESET corresponding to the Type 0-PDCCH CSS set with one TCI state has a lower priority than the CORESETs corresponding to other CSS sets with two TCI states.

[0165] According to the first embodiment described above, when multiple PDCCHs (CORESET) collide, it is possible to appropriately determine the PDCCH to be monitored.

[0166] <Second embodiment> The second embodiment relates to an FDM PDCCH repetition scheme, but is not limited to an FDM PDCCH repetition scheme and may also be used for a non-SFN PDCCH repetition scheme.

[0167] In the second embodiment, two SS sets with corresponding multiple CORESETs may be used for PDCCH repetition. The association between the two SS sets and the multiple CORESETs may be specified in advance by a specification or configured in the UE by higher layer signaling (e.g., RRC signaling).

[0168] In the second embodiment, in the case where multiple PDCCHs of different QCL types D collide, the UE determines a prioritized CORESET based on at least one priority rule shown in embodiments 2.1 to 2.3. Each of these will be described below.

[0169] Note that the association between a certain CORESET (e.g., a preferred CORESET) and another CORESET may be defined in advance by a specification, or may be configured in a UE by higher layer signaling (e.g., RRC signaling). Also, association is not limited to CORESETs, but a CORESET and an SS set may be associated, or SS sets may be associated with each other.

[0170] In the second embodiment, the preferred CORESET may be interchangeably read as "preferred CORESET / SS set corresponding to preferred CORESET." Also, in the second embodiment, another CORESET may be interchangeably read as "another CORESET / SS set corresponding to another CORESET."

[0171] The "association" in the second embodiment may be called an association for collision control of a plurality of PDCCHs, an association for CORESET selection for PDCCH monitoring, an association regarding CORESET priority, or the like.

[0172] [Embodiment 2.1] The priority rule in embodiment 2.1 is the same as that in Rel.16 NR. That is, the UE determines the preferred CORESET according to the priority rule that the CSS set is monitored with priority over the USS set, and among SS sets of the same type (CSS or USS), the one with the smaller index (i.e., the one with the smaller cell index; if the cell index is the same, the one with the smaller SS set index) is monitored with priority.

[0173] Embodiment 2.1 is further divided into the following two categories: Embodiment 2.1.1: The preferred CORESET is associated with another CORESET; Embodiment 2.1.2: The preferred CORESET is not associated with another CORESET.

[0174] [[Embodiment 2.1.1]] The UE may monitor another CORESET related to the Preferred CORESET simultaneously with the Preferred CORESET.

[0175] In embodiment 2.1.1, the TCI state of the prioritized CORESET may be referred to as a first priority TCI state, and the TCI state of the other CORESET may be referred to as a second priority TCI state.

[0176] For the remaining CORESETs excluding the Preferred CORESET and the above-mentioned Alternate CORESET, the UE may monitor this CORESET if the following condition (2.1.1a) or (2.1.1b) is satisfied: (2.1.1a) The TCI state is the same QCL type D as the first priority TCI state; (2.1.1b) The TCI state is QCL type D, which is the same as the first priority TCI state or the second priority TCI state.

[0177] 9 is a diagram showing an example of a prioritized CORESET and other CORESETs monitored simultaneously in embodiment 2.1.1. In this example, three CORESETs (CORESET#1-#3) overlap in time.

[0178] CORESET#1 corresponds to USS set index=1 and cell index=0 and has one active TCI state (TCI state#1).

[0179] CORESET#2 corresponds to USS set index=2 and cell index=0 and has one active TCI state (TCI state#2).

[0180] CORESET#3 corresponds to USS set index=3 and cell index=0 and has one active TCI state (TCI state#2).

[0181] Furthermore, CORESET#1 and #2 are associated with each other.

[0182] In the case of Fig. 9, the UE first selects CORESET#1, which corresponds to the USS set with the smallest USS set index, as the preferred CORESET. Since CORESET#1 has another associated CORESET (CORESET#2), the operation is as in embodiment 2.1.1.

[0183] Since CORESET#2 is associated with the preferred CORESET, the UE monitors CORESET#2 and determines the active TCI state of CORESET#2 as the second preferred TCI state.

[0184] Although CORESET#3 is not associated with the preferred CORESET, the active TCI state of CORESET#3 is the same as the second preferred TCI state, QCL type D. Therefore, a UE complying with (2.1.1a) above does not monitor CORESET#3. A UE complying with (2.1.1b) above monitors CORESET#3.

[0185] [[Embodiment 2.1.2]] In embodiment 2.1.2, the prioritized CORESET determined first according to the same priority rules as those of Rel.16 NR is also referred to as the first prioritized CORESET, and the next prioritized CORESET determined other than the first prioritized CORESET is also referred to as the second prioritized CORESET. The second prioritized CORESET may be referred to as CORESET X.

[0186] The active TCI state of the first priority CORESET may be referred to as the first priority TCI state, and the active TCI state of the second priority CORESET may be referred to as the second priority TCI state.

[0187] Embodiment 2.1.2 is roughly divided into embodiments 2.1.2.1 and 2.1.2.2 depending on the method for determining the second priority CORESET.

[0188] [[Embodiment 2.1.2.1]] The second preferred CORESET may be determined from the remaining conflicting CORESETs excluding the first preferred CORESET according to the same priority rules as in Rel. 16. That is, the second preferred CORESET may correspond to the CSS set with the smallest index in the cell with the smallest index that contains a CSS set, if any, among the remaining conflicting CORESETs, or the USS set with the smallest index in the cell with the smallest index. The smallest USS set index is determined across all USS sets that have at least one PDCCH candidate in overlapping PDCCH monitoring occasions.

[0189] If the active TCI state of a candidate for the second preferred CORESET derived according to the above priority rule is the same as the first preferred TCI state, the UE may search for the next candidate (the CORESET corresponding to the SS set / cell with the next smallest index) as a candidate for the second preferred CORESET. That is, the UE may continue searching for the second preferred CORESET until the active TCI state is different from the first preferred TCI state.

[0190] If the UE finds a CORESET that has only one active TCI state that is different from the first preferred TCI state according to the above priority rules, the UE may determine this active TCI state as the second preferred TCI state and determine this CORESET as the second preferred CORESET.

[0191] In addition, even if the active TCI state of a candidate for the second preferred CORESET derived according to the above priority rule is the same as the first preferred TCI state, the UE may determine this active TCI state as the second preferred TCI state and determine this candidate as the second preferred CORESET. In this case, since the second preferred CORESET is the same as the first preferred CORESET, it may be expressed as there being no second preferred CORESET.

[0192] 10 is a diagram showing an example of a prioritized CORESET in embodiment 2.1.2.1. In this example, three CORESETs (CORESET#1-#3) overlap in time.

[0193] CORESET#1 corresponds to USS set index=1 and cell index=0 and has one active TCI state (TCI state#1).

[0194] CORESET#2 corresponds to USS set index=2 and cell index=0 and has one active TCI state (TCI state#1).

[0195] CORESET#3 corresponds to USS set index=3 and cell index=0 and has one active TCI state (TCI state#2).

[0196] In the case of Figure 10, the UE first selects CORESET#1, which corresponds to the USS set with the smallest USS set index, as the preferred CORESET. Since CORESET#1 does not have another CORESET associated with it, the operation is as in embodiment 2.1.2. This preferred CORESET corresponds to the first preferred CORESET, and TCI state#1 corresponds to the first preferred TCI state.

[0197] Next, the UE searches for a second preferred CORESET. Since the TCI state of CORESET#3 (TCI state#2) is different from the TCI state#1 of the preferred CORESET, the UE determines this TCI state#2 as the second preferred TCI state and determines CORESET#3 as the second preferred CORESET to monitor.

[0198] [[Embodiment 2.1.2.2]] From the remaining conflicting CORESETs excluding the first preferred CORESET, the UE first determines a subset of CORESETs that are associated with another CORESET and whose TCI state is the same as the first preferred TCI state.

[0199] The UE may then determine a second preferred CORESET from the subset according to the same priority rules as in Rel. 16. That is, the second preferred CORESET may correspond to the CSS set with the smallest index in the cell with the smallest index that includes a CSS set, if any, among the CORESETs included in the subset, or the USS set with the smallest index in the cell with the smallest index. The smallest USS set index is determined across all USS sets that have at least one PDCCH candidate in overlapping PDCCH monitoring occasions.

[0200] The second preferred TCI state may correspond to an active TCI state of another CORESET associated with the second preferred CORESET.

[0201] The second preferred CORESET may be the CORESET associated with the CORESET corresponding to the CSS set with the lowest index in the cell with the lowest index that includes the CSS set, if any, among the CORESETs included in the subset, or the CORESET associated with the USS set with the lowest index in the cell with the lowest index. In this case, the second preferred TCI state may correspond to the active TCI state of the second preferred CORESET.

[0202] 11 is a diagram showing an example of a prioritized CORESET in embodiment 2.1.2.2. In this example, four CORESETs (CORESET#1-#4) overlap in time.

[0203] CORESET#1 corresponds to USS set index=1 and cell index=0 and has one active TCI state (TCI state#1).

[0204] CORESET#2 corresponds to USS set index=2 and cell index=0 and has one active TCI state (TCI state#3).

[0205] CORESET#3 corresponds to USS set index=3 and cell index=0 and has one active TCI state (TCI state#1).

[0206] CORESET#4 corresponds to USS set index=4 and cell index=0 and has one active TCI state (TCI state#2).

[0207] CORESET#1 is not associated with any other CORESET. CORESET#2 is not associated with any other CORESET. CORESET#3 and #4 are associated with each other.

[0208] In the case of Figure 11, the UE first selects CORESET#1, which corresponds to the USS set with the smallest USS set index, as the preferred CORESET. Since CORESET#1 does not have another CORESET associated with it, the operation is as in embodiment 2.1.2. This preferred CORESET corresponds to the first preferred CORESET, and TCI state#1 corresponds to the first preferred TCI state.

[0209] Next, the UE searches for a second preferred CORESET. Of the remaining CORESETs #2-#4, CORESET #3 is the only CORESET that has another associated CORESET and whose TCI state is the same as the first preferred TCI state. Therefore, the UE determines CORESET #3 as the second preferred CORESET and determines TCI state #2 of CORESET #4 associated with CORESET #3 as the second preferred TCI state. The UE monitors PDCCH candidates in CORESETs #3 and #4.

[0210] [[CORESET other than the preferred CORESET]] The monitoring of the priority CORESETs (first priority CORESET and second priority CORESET) and CORESETs other than the CORESETs associated with the priority CORESETs in embodiment 2.1.2 will be described.

[0211] For these CORESETs, the UE may monitor this CORESET if either (2.1.2a) or (2.1.2b) of the following conditions is met: (2.1.2a) The TCI state is the same QCL type D as the first priority TCI state; (2.1.2b) The TCI state is QCL type D, which is the same as the first priority TCI state or the second priority TCI state.

[0212] 12 is a diagram showing an example of a prioritized CORESET and other CORESETs monitored simultaneously in embodiment 2.1.2. In this example, four CORESETs (CORESET#1-#4) overlap in time.

[0213] CORESET#1 corresponds to USS set index=1 and cell index=0 and has one active TCI state (TCI state#1).

[0214] CORESET#2 corresponds to USS set index=3 and cell index=0 and has one active TCI state (TCI state#1).

[0215] CORESET#3 corresponds to USS set index=4 and cell index=0 and has one active TCI state (TCI state#2).

[0216] CORESET#4 corresponds to USS set index=5 and cell index=0 and has one active TCI state (TCI state#2).

[0217] CORESET#1 is not associated with any other CORESET, and CORESET#2 and #3 are associated with each other.

[0218] In the case of Figure 12, the UE first selects CORESET#1 corresponding to the USS set with the smallest USS set index as the preferred CORESET. Since CORESET#1 does not have another CORESET associated with it, the operation is as in embodiment 2.1.2. This preferred CORESET corresponds to the first preferred CORESET, and TCI state#1 corresponds to the first preferred TCI state.

[0219] Next, the UE searches for a second preferred CORESET. Of the remaining CORESETs #2-#4, CORESET #2 is the only CORESET that has another associated CORESET and whose TCI state is the same as the first preferred TCI state. Therefore, the UE determines CORESET #2 as the second preferred CORESET and determines TCI state #2 of CORESET #3 associated with CORESET #2 as the second preferred TCI state. The UE monitors PDCCH candidates in CORESETs #2 and #3.

[0220] The UE does not monitor CORESET#4 when condition (2.1.2a) is considered, and monitors CORESET#4 when condition (2.1.2b) is considered.

[0221] [Embodiment 2.2] The priority rules of embodiment 2.2 are as follows: Step 1: If there are any subsets of conflicting CORESETs that are associated with another CORESET (in other words, have an association with another CORESET), apply the priority rules of Rel. 16 NR only to those subsets. If a preferred CORESET is found, end the step. If not, proceed to step 2. · Step 2: If no preferred CORESET is found in Step 1, apply the Rel.16 NR priority rules to only the subset of conflicting CORESETs that do not have an association with another CORESET.

[0222] In other words, in embodiment 2.2, the UE determines the preferred CORESET according to a priority rule in which the CORESET to be monitored is determined in the following order: CSS set with association with another CORESET (hereinafter, in this disclosure, also simply referred to as "association") > USS set with association > CSS set without association > USS set without association.

[0223] In addition, among SS sets of the same type (CSS or USS) that have an association (or no association), the one with the smaller index (i.e., the one with the smaller cell index; if the cell index is the same, the one with the smaller SS set index) is selected as the preferred CORESET.

[0224] As in the description in embodiment 2.1.1, a CORESET to be monitored may be determined from CORESETs other than the preferred CORESET. That is, for the remaining CORESETs excluding the preferred CORESET and another CORESET associated with the preferred CORESET, the UE may monitor this CORESET if the above (2.1.1a) or (2.1.1b) is satisfied.

[0225] 13 is a diagram showing an example of a priority CORESET and other CORESETs monitored simultaneously in embodiment 2.2. In this example, four CORESETs (CORESET#1-#4) overlap in time.

[0226] CORESET#1 corresponds to CSS set index=0 and cell index=0 and has one active TCI state (TCI state#1).

[0227] CORESET#2 corresponds to USS set index=1 and cell index=0 and has one active TCI state (TCI state#2).

[0228] CORESET#3 corresponds to USS set index=2 and cell index=0 and has one active TCI state (TCI state#3).

[0229] CORESET#4 corresponds to USS set index=3 and cell index=0 and has one active TCI state (TCI state#3).

[0230] CORESET#1 is not associated with any other CORESET, and CORESET#2 and #3 are associated with each other.

[0231] 13, CORESETs associated with another CORESET are CORESET#2 and #3, and CORESET#2, which corresponds to the smaller SS set index, is selected as the preferred CORESET. TCI state #2 of CORESET#2 corresponds to the first preferred TCI state.

[0232] The TCI state #3 of CORESET #3 associated with the preferred CORESET is determined as the second preferred TCI state. The UE monitors PDCCH candidates in CORESET #2 and #3.

[0233] Since the TCI state of CORESET#1 is neither the first priority TCI state nor the second priority TCI state, the UE does not monitor CORESET#1. Also, a UE that complies with (2.1.1a) above does not monitor CORESET#4. A UE that complies with (2.1.1b) above monitors CORESET#4.

[0234] [Embodiment 2.3] The priority rules of embodiment 2.3 are as follows: Step 1: If there is a CORESET among the conflicting CORESETs that has an association and corresponds to the CSS set with the smallest index in the cell with the smallest index that contains the CSS set, determine this as the dominant CORESET and end the step. If not, proceed to step 2. Step 2: If there is a CORESET among the conflicting CORESETs that does not have an association and corresponds to the CSS set with the smallest index in the cell with the smallest index that contains the CSS set, determine this as the dominant CORESET and end the step. Otherwise, proceed to step 3. Step 3: If there is a CORESET among the conflicting CORESETs that has an association and corresponds to the USS set with the smallest index in the cell with the smallest index that contains the USS set, determine this as the preferred CORESET and end the step. If not, proceed to step 4. Step 4: If there is a CORESET among the conflicting CORESETs that does not have an association and corresponds to the USS set with the smallest index in the cell with the smallest index that contains the USS set, determine this CORESET as the preferred CORESET and end the step.

[0235] In other words, in embodiment 2.3, the UE determines the preferred CORESET according to the priority rule that the CORESET to be monitored is determined in the following order: CSS set with association > CSS set without association > USS set with association > USS set without association.

[0236] In addition, among SS sets of the same type (CSS or USS) that have an association (or no association), the one with the smaller index (i.e., the one with the smaller cell index; if the cell index is the same, the one with the smaller SS set index) is selected as the preferred CORESET.

[0237] When a preferred CORESET is determined in the above step 1 or 3, the UE may determine a CORESET to further monitor from among CORESETs other than the preferred CORESET based on embodiment 2.1.1.

[0238] When a preferred CORESET is determined in the above step 2 or 4, the UE may determine a CORESET to further monitor from among CORESETs other than the preferred CORESET based on embodiment 2.1.2.

[0239] Note that the CORESET corresponding to the Type 0-PDCCH CSS set (in other words, the CSS set for receiving system information) has always had the highest priority under the priority rules of the existing Rel. 15 / 16 NR because its SS set index is 0. However, under the priority rules of embodiment 1.3, the CORESET corresponding to the Type 0-PDCCH CSS set with one TCI state has a lower priority than the CORESETs corresponding to other CSS sets with two TCI states.

[0240] According to the second embodiment described above, when multiple PDCCHs (CORESET) collide, it is possible to appropriately determine the PDCCH to be monitored.

[0241] <Third embodiment> [SFN-PDCCH Variation] For the first embodiment (SFN-PDCCH), only one CORESET may be selected at any time, in other words, there may be no need to select a second preferred CORESET as in embodiment 1.1.2.

[0242] Regarding the first embodiment, if one selected CORESET (preferred CORESET) has two TCI states, the UE may monitor PDCCH candidates in one or more CORESETs using both of the two TCI states.

[0243] For the first embodiment, if a selected CORESET (preferred CORESET) has only one TCI state, the UE may monitor PDCCH candidates in one or more CORESETs using only the one TCI state, in which case the one or more CORESETs may be abandoned for use as an SFN-CORESET (CORESET for SFN).

[0244] [Variations for selecting a preferred CORESET] In the description of embodiment 1.1 and embodiment 2.1, it is assumed that the preferred CORESET is selected from all overlapping CORESETs, but this is not limited to this. The preferred CORESET may be selected from among all overlapping CORESETs, that is, from among CORESETs having two TCI states (e.g., SFN-CORESET) (in other words, by prioritizing CORESETs having two TCI states), based on the priority rule described above.

[0245] [Modification of monitors with CORESETs other than the preferred CORESET] In any of the above embodiments, a (first / second) preferred CORESET is selected. If the preferred CORESET has two TCI states, the UE may monitor all CORESETs that have either or both of the two TCI states. If the preferred CORESET has only one TCI state, the UE may monitor all CORESETs that have at least the one TCI state, or all CORESETs that have only the one TCI state.

[0246] 14 is a diagram showing an example of another CORESET that is monitored simultaneously with a prioritized CORESET having two TCI states. In this example, three CORESETs (CORESET#1-#3) overlap in time.

[0247] CORESET#1 has two active TCI states (TCI states #1 and #2), CORESET#2 has one active TCI state (TCI state #1), and CORESET#3 has two active TCI states (TCI states #1 and #3).

[0248] 14, consider the case where the UE selects CORESET#1 as the preferred CORESET, and monitors PDCCH candidates in CORESET#1.

[0249] CORESET#2 has only one of the TCI states (TCI state #1) that the preferred CORESET has. If all CORESETs that have either of the two TCI states that the preferred CORESET has are monitored, the UE may monitor CORESET#2 together with CORESET#1 using TCI state #1. If all CORESETs that have both of the two TCI states that the preferred CORESET has are monitored, the UE may not monitor CORESET#2 together with CORESET#1.

[0250] CORESET#3 has one of the TCI states (TCI state#1) that the preferred CORESET has and a TCI state (TCI state#3) that the preferred CORESET does not have. If all CORESETs that have either of the two TCI states that the preferred CORESET has are monitored, the UE may monitor CORESET#3 together with CORESET#1 using TCI state#1. If all CORESETs that have both of the two TCI states that the preferred CORESET has are monitored, the UE may not monitor CORESET#3 together with CORESET#1.

[0251] In addition, when a preferred CORESET has two TCI states, the UE may monitor any other CORESET that overlaps in time using either or both of the two TCI states. For example, in the case of Figure 14, the UE may (forcibly) monitor PDCCH candidates using either or both of TCI states #1 and #2 in at least one of CORESETs #2 and #3.

[0252] 15 is a diagram showing an example of other CORESETs monitored simultaneously with a prioritized CORESET having only one TCI state. In this example, three CORESETs (CORESET#1-#3) overlap in time.

[0253] CORESET#1 has one active TCI state (TCI state #1), CORESET#2 has one active TCI state (TCI state #1), and CORESET#3 has two active TCI states (TCI states #1 and #3).

[0254] 15, consider the case where the UE selects CORESET#1 as the preferred CORESET, and monitors PDCCH candidates in CORESET#1.

[0255] CORESET#2 has the same TCI state #1 as the preferred CORESET. The UE may monitor CORESET#2 together with CORESET#1 using TCI state #1.

[0256] CORESET#3 has TCI state#1 that the preferred CORESET has and a TCI state (TCI state#3) that the preferred CORESET does not have. If all CORESETs that have at least one TCI state that the preferred CORESET has are monitored, the UE may monitor CORESET#3 together with CORESET#1 using TCI state#1. If all CORESETs that have only one TCI state that the preferred CORESET has are monitored, the UE may not monitor CORESET#3 together with CORESET#1.

[0257] In addition, when a preferred CORESET has one TCI state, the UE may monitor any other CORESET that overlaps in time using the one TCI state. For example, in the case of Figure 15, the UE may (forcibly) use TCI state #1 to monitor PDCCH candidates in at least one of CORESETs #2 and #3.

[0258] [Priority rules for SFN-PDCCH and PDCCH repetition] For SFN-PDCCH, it is preferable that a CORESET with two TCI states has a higher priority than a CORESET with one TCI state, so it is preferable to adopt embodiment 1.2 or 1.3. Embodiment 1.3 may be preferable to embodiment 1.2 because it is the same as the priority rule in Rel.15 / 16 in that the CSS always has a higher priority than the USS.

[0259] The priority rule for SFN-PDCCH (SFN-CORESET) (first embodiment) and the priority rule for PDCCH repetition (second embodiment) may be the same (or similar), or different. In other words, the UE may determine a preferred CORESET for SFN-PDCCH and PDCCH repetition based on the same priority rule, or may determine a preferred CORESET based on different priority rules.

[0260] For example, when embodiment 1.3 and embodiment 2.3 are adopted, the priority rule is the same for SFN-PDCCH and PDCCH repetition. In this case, a reduction in the processing load of the UE can be expected. In particular, when both SFN-PDCCH and PDCCH repetition are configured within the same BWP / CC / band / frequency range / UE, it is preferable to adopt a common priority rule.

[0261] Information regarding the priority rule for SFN-PDCCH (SFN-CORESET) (e.g., information indicating the priority rule to be applied), information regarding the priority rule for PDCCH repetition (e.g., information indicating the priority rule to be applied), etc. may be configured in the UE using physical layer signaling (e.g., Downlink Control Information (DCI)), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel, or a combination thereof, or may be determined based on UE capabilities. Note that when these priority rules are common, one piece of information may be configured in the UE / determined by the UE.

[0262] Furthermore, for a UE that supports reception of two different beams and is configured with PDCCH repetition, the determination of the two QCL-D characteristics for overlapping CORESETs may be determined from the following options: Option 1: Identify two QCL-D characteristics based on the traditional order of priority (Rel. 15 / 16 priority rules), Option 2: Determine a first QCL-D characteristic based on the conventional Rel. 15 / 16 priority rules, and then identify a second QCL-D according to one of one or more SS sets (from among multiple overlapping CORESETs) linked to the SS set having the first QCL-D, where for multiple such SS set pairs, the second QCL-D may be determined according to the Rel. 15 / 16 priority order; Option 3: Assign the same priority for two linked SS sets for PDCCH transmission of overlapping monitoring occasions, where the priority may be according to the one with the smaller SS Set ID.

[0263] The order of priority may also be SS type (USS / CSS) > SS set linkage (linked SS sets have higher priority than individual (unlinked) SS sets) > cell index > associated SS set ID.

[0264] Option 1 may correspond to embodiment 2.1.1, embodiment 2.1.2.1, etc. Option 2 may correspond to embodiment 2.1.2.2. Option 3 may correspond to embodiment 2.3.

[0265] Note that the UE may or may not assume that both the PDCCH repetition and the SFN-CORESET are set to different CORESETs within the same BWP / CC / band / UE.

[0266] When both PDCCH repetition and SFN-CORESET are configured (or occur) in the same symbol (time-overlapping PDCCH monitoring occasions), the UE may perform PDCCH QCL-D collision handling for them in accordance with the priority rule for the PDCCH repetition (e.g., any of the priority rules described in the second embodiment) or the priority rule for the SFN-CORESET (e.g., any of the priority rules described in the first embodiment).

[0267] The UE may assume that the priority rule for the configured / determined PDCCH repetition and the priority rule for the configured / determined SFN-CORESET are the same (common), in which case, regardless of which priority rule is followed, the PDCCH QCL-D collision handling for PDCCH repetition and SFN-CORESET in the same symbol will be based on the same priority rule.

[0268] In addition, the UE may perform PDCCH QCL-D collision handling according to different priority rules for symbols where both PDCCH repetition and SFN-CORESET exist (other CORESETs may also exist) and symbols where only one of PDCCH repetition and SFN-CORESET exists (other CORESETs may also exist).

[0269] <Other> It should be noted that at least one of the above-described embodiments may be applied only to UEs that have reported or support a particular UE capability.

[0270] The specific UE capabilities may indicate at least one of the following: Whether to support SFN PDCCH repetition scheme (or SFN-PDCCH or SFN-CORESET); Whether to support PDCCH repetition; Whether to support SFN PDCCH repetition scheme for CSS set (or SFN-PDCCH or SFN-CORESET); Whether to support PDCCH repetition for CSS sets; ·Whether or not simultaneous reception of PDCCHs of two or more different QCL type D is supported.

[0271] Furthermore, at least one of the above-described embodiments may be applied when specific information related to the above-described embodiments is configured in the UE by higher layer signaling (if not configured, for example, the operation of Rel. 15 / 16 applies). For example, the specific information may be information indicating that an SFN / FDM PDCCH repetition scheme (or SFN-PDCCH or SFN-CORESET) is enabled, any RRC parameter for a specific release (e.g., Rel. 17), etc.

[0272] The UE capabilities, specific information, etc. may be configured / reported commonly for the SFN-PDCCH and the PDCCH repetition, or may be configured / reported separately (by independent parameters) for each.

[0273] Note that the first embodiment is not limited to the case where a UE is configured (or uses) an SFN PDCCH repetition scheme, but can be applied to the case where one or more TCI states are activated per CORESET. The first embodiment may also be applied to the case where an HST scheme 0 / , scheme 1 / scheme 2 / network pre-compensation scheme is used / configured in the UE.

[0274] Furthermore, the second embodiment is not limited to cases where the UE is configured with (or uses) an FDM PDCCH repetition scheme, but is also applicable to cases where two SS sets with corresponding multiple CORESETs are used for the PDCCH.

[0275] (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.

[0276] 16 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0277] 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.

[0278] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0279] 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 the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0280] 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 locations and numbers of the cells and user terminals 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 base station 10.

[0281] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0282] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may be a frequency band higher than FR2.

[0283] 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.

[0284] The multiple base stations 10 may be connected by wire (for example, optical fiber conforming to the Common Public Radio Interface (CPRI), an X2 interface, or the like) or wirelessly (for example, 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.

[0285] 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.

[0286] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0287] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the radio 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).

[0288] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0289] 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.

[0290] 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)), etc. may be used as an uplink channel.

[0291] The PDSCH transmits user data, higher layer control information, System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit Master Information Block (MIB).

[0292] 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.

[0293] 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 an UL grant, a UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

[0294] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0295] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," "CORESET setting," etc. in the present disclosure may be read interchangeably.

[0296] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), acknowledgement 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.

[0297] 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.

[0298] 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, 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 as DL-RS.

[0299] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and 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 reference signals.

[0300] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0301] (base station) 17 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.

[0302] 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.

[0303] 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.

[0304] 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 to be transmitted as signals, control information, sequences, etc., 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.

[0305] 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.

[0306] The transmitting / receiving unit 120 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 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0307] 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 pertains, such as an array antenna.

[0308] 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.

[0309] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0310] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0311] The transceiver 120 (transmission processor 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.

[0312] The transmitting / receiving unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna .

[0313] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna .

[0314] 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.

[0315] 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.

[0316] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0317] 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.

[0318] The transceiver 120 may transmit to the user terminal 20 at least one of the downlink control channels (Physical Downlink Control Channels (PDCCHs)) in multiple control resource sets (CORESETs) that overlap in time.

[0319] It may be assumed that the control unit 110 performs control to determine the PDCCH that the user terminal 20 monitors for the multiple CORESETs in accordance with the Transmission Configuration Indication state (TCI state) of only one CORESET that is selected based on a priority rule.

[0320] (user terminal) 18 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.

[0321] Note that this example mainly shows functional blocks of the characteristic parts of the present embodiment, 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.

[0322] 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, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0323] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also 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.

[0324] 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 from 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 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.

[0326] The transmitting / receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0327] 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.

[0328] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0329] The transceiver 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.

[0330] The transceiver 220 (transmission processor 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.

[0331] 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 when transform precoding is not enabled, the transceiver unit 220 may not perform DFT processing as the transmission processing.

[0332] The transmitting / receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna 230.

[0333] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0334] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0335] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, 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.

[0336] The transmitting section and receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0337] In addition, the control unit 210 may determine the physical downlink control channel (PDCCH) to monitor for downlink control channels (PDCCH) in multiple control resource sets (CORESETs) that overlap in time, in accordance with the transmission configuration indication state (TCI state) of only one CORESET selected based on a priority rule.

[0338] The transceiver 220 may monitor the determined PDCCH.

[0339] The priority rule may be a rule that determines, among the plurality of CORESETs, a CORESET corresponding to a Common Search Space (CSS) set in preference to a CORESET corresponding to a UE-specific Search Space (USS) set.

[0340] The priority rule may be a rule that determines, among the plurality of CORESETs, a CORESET corresponding to a Common Search Space (CSS) set having two active TCI states, a CORESET corresponding to a UE-specific Search Space (USS) set having two active TCI states, a CORESET corresponding to a CSS set having one active TCI state, and a CORESET corresponding to a USS set having one active TCI state in this order of priority.

[0341] The priority rule may be a rule that determines, among the plurality of CORESETs, a CORESET corresponding to a Common Search Space (CSS) set having two active TCI states, a CORESET corresponding to a CSS set having one active TCI state, a CORESET corresponding to a UE-specific Search Space (USS) set having two active TCI states, and a CORESET corresponding to a USS set having one active TCI state in this order of priority.

[0342] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. 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 also be realized by combining the single device or multiple devices with software.

[0343] 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 mentioned above, the implementation method of each is not particularly limited.

[0344] 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. 19 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.

[0345] In this disclosure, terms such as apparatus, circuit, device, section, unit, etc. may be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0346] 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.

[0347] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined 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.

[0348] 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), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0349] 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 realized by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be realized in a similar manner.

[0350] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to an embodiment of the present disclosure.

[0351] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact 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, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as a secondary storage device.

[0352] 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.

[0353] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0354] 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.

[0355] 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 such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0356] (Variation) Note that terms explained 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.

[0357] 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.

[0358] 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, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0359] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol), and may be a time unit based on numerology.

[0360] 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.

[0361] 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.

[0362] 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 a subframe and a 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.

[0363] 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. However, the definition of TTI is not limited to this.

[0364] 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.

[0365] 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.

[0366] 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.

[0367] 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 equal to or greater than 1 ms.

[0368] 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 also be determined based on numerology.

[0369] 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. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0370] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0371] 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.

[0372] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a 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 given BWP and numbered within that BWP.

[0373] The BWP may include an UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0374] 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."

[0375] 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.

[0376] 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.

[0377] 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.

[0378] 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.

[0379] 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.

[0380] 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.

[0381] Notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, 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.

[0382] Note that the physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be called 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).

[0383] 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).

[0384] 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).

[0385] 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.

[0386] 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), then these wired and / or wireless technologies are included within the definition of transmission media.

[0387] 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).

[0388] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0389] In this disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0390] 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 divided 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 term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0391] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0392] 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.

[0393] 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.

[0394] 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.

[0395] 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.

[0396] Fig. 20 is a diagram showing an example of a vehicle according to an embodiment. As shown in Fig. 20, a 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.

[0397] 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 the user.

[0398] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (e.g., 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).

[0399] 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.

[0400] 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 various types of 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 types of information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0401] The driving assistance system unit 64 is configured with various devices that provide functions for preventing accidents and reducing 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.

[0402] 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.

[0403] 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 above-mentioned base station 10 or user terminal 20. Furthermore, the communication module 60 may be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (or may function as at least one of the base station 10 and user terminal 20).

[0404] The communication module 60 may transmit at least one of the signals from the various sensors 50-58 input to the electronic control unit 49 and information obtained based on the signals to an external device via wireless communication.

[0405] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from external devices and displays it on an information service unit 59 provided in the vehicle. The communication module 60 also stores the various information received from the 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.

[0406] 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 uplink channel and downlink channel may be read as sidelink channel.

[0407] 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.

[0408] 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) and a Serving-Gateway (S-GW)), or a combination thereof.

[0409] 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 specific order presented.

[0410] 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 The present invention may be applied to systems that use 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. It may also be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0411] 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."

[0412] 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.

[0413] 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.

[0414] 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.

[0415] Also, "decision" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "decision" may be considered to be "deciding" on some action.

[0416] Furthermore, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," or the like.

[0417] 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."

[0418] 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.

[0419] 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."

[0420] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0421] 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.

[0422] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A control unit that determines Physical Downlink Control Channel (PDCCH) candidates to monitor for time-overlapping PDCCH monitoring opportunities in multiple Control Resource Sets (CORESETs) according to a QCL type for spatial reception parameters of a Transmission Configuration Indication state (TCI state) of only one first CORESET among the multiple CORESETs, the first CORESET being selected based on a priority rule; a receiving unit that monitors the determined PDCCH candidates, When the plurality of CORESETs are CORESETs of a single frequency network (SFN), the control unit monitors the PDCCH candidates in the first CORESET and a second CORESET among the plurality of CORESETs that is different from the first CORESET, and the PDCCH candidates to be monitored in the second CORESET are determined according to the same QCL type as the QCL type.

2. A terminal as described in claim 1, wherein when the first CORESET and the second CORESET have two activated TCI states, the QCL type of at least one of the two TCI states of the second CORESET is the same as the QCL type of either one of the two TCI states of the first CORESET.

3. A terminal as described in claim 1, wherein, when the multiple CORESETs further include a CORESET used for repeated transmission of a PDCCH, the control unit applies a second priority rule different from the priority rule to select a PDCCH candidate to monitor for a PDCCH monitoring opportunity of the CORESET used for repeated transmission of the PDCCH.

4. 4. The terminal of claim 3, wherein the priority rule and the second priority rule include monitoring a CORESET corresponding to a Common Search Space (CSS) set in preference to a CORESET corresponding to a UE-specific Search Space (USS) set.

5. The terminal of claim 2, wherein activation of the two TCI states is signaled by a MAC CE.

6. A step of determining Physical Downlink Control Channel (PDCCH) candidates to monitor for temporally overlapping PDCCH monitoring opportunities in a plurality of Control Resource Sets (CORESETs) according to a QCL type for spatial reception parameters of a Transmission Configuration Indication state (TCI state) of only one first CORESET among the plurality of CORESETs, the first CORESET being selected based on a priority rule; monitoring the determined PDCCH candidates, where if the plurality of CORESETs are CORESETs of a single frequency network (SFN), monitoring the PDCCH candidates in the first CORESET and in a second CORESET of the plurality of CORESETs that is different from the first CORESET; The PDCCH candidates to be monitored in the second CORESET are determined according to the same QCL type as the QCL type.

7. A method for transmitting Physical Downlink Control Channel (PDCCH) candidates to a terminal, the PDCCH candidates being monitored for time-overlapping downlink control channel (PDCCH) monitoring opportunities in a plurality of control resource sets (CORESETs); a control unit that assumes that the terminal performs control to select the PDCCH candidates to monitor based on a priority rule and to determine the PDCCH candidates in accordance with a QCL type for spatial reception parameters in a Transmission Configuration Indication state (TCI state) of only one, first, CORESET among the plurality of CORESETs, and that, when a single frequency network (SFN) is configured for the plurality of CORESETs, the terminal monitors the PDCCH candidates in the first CORESET and a second CORESET among the plurality of CORESETs that is different from the first CORESET, and that performs control to determine the PDCCH candidates to monitor in the second CORESET in accordance with the same QCL type as the QCL type.

8. A system including a terminal and a base station, The terminal a controller configured to determine Physical Downlink Control Channel (PDCCH) candidates to monitor for time-overlapping PDCCH monitoring opportunities in a plurality of Control Resource Sets (CORESETs) according to a QCL type for spatial reception parameters of a Transmission Configuration Indication state (TCI state) of only one first CORESET among the plurality of CORESETs, the first CORESET being selected based on a priority rule; a receiving unit that monitors the determined PDCCH candidates, When the plurality of CORESETs are CORESETs of a single frequency network (SFN), the control unit monitors the PDCCH candidates in the first CORESET and a second CORESET among the plurality of CORESETs that is different from the first CORESET, and the PDCCH candidates to be monitored in the second CORESET are determined according to a QCL type that is the same as the QCL type; The base station A system comprising a transmitter that transmits PDCCH candidates to the terminal during the temporally overlapping PDCCH monitoring opportunities.

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