Terminal, wireless communication method, base station and system

Abstract

A terminal according to one aspect of the present disclosure comprises: a control unit that determines whether or not two physical downlink control channel (PDCCH) candidates out of a plurality PDCCH candidates can be allocated; and a reception unit that receives the two PDCCH candidates if it is determined that the two PDCCH candidates can be allocated, wherein the two PDCCH candidates are within the same slot or the same span, the two PDCCH candidates are associated with two search space sets, the two PDCCH candidates are linked to each other, and if it is determined that the two PDCCH candidates cannot be allocated, the control unit determines whether or not at least one PDCCH candidate out of the plurality of PDCCH candidates can be allocated. With one aspect of the present disclosure, it is possible to properly determine a PDCCH candidate.

Description

[Technical field]

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

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

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

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

[0005] Physical downlink control channel (PDCCH) repetition is being considered.

[0006] However, it is unclear how to determine PDCCH candidates for multiple repetitions for a given limit (maximum number). If PDCCH candidates are not appropriately determined, there is a risk that throughput will decrease or communication quality will deteriorate.

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

[0008] A terminal according to an embodiment of the present disclosure includes: A transmitting unit for reporting a UE capability for decoding two mutually linked PDCCH candidates among a plurality of PDCCH candidates; A control unit that determines whether two PDCCH candidates can be arranged, and a receiving unit that receives the two PDCCH candidates when it is determined that the two PDCCH candidates can be arranged, wherein the two PDCCH candidates are in the same slot, and the two PDCCH candidates are respectively associated with two search space sets. ,before When it is determined that the two PDCCH candidates cannot be arranged, the control unit: Based on the UE capabilities, Determine whether one or more PDCCH candidates can be configured among the plurality of PDCCH candidates. Effect of the Invention

[0009] According to one aspect of the present disclosure, PDCCH candidates can be appropriately determined. [Brief description of the drawings]

[0010] [Figure 1]1A and 1B are diagrams illustrating an example of the maximum number of monitored PDCCH candidates. [Diagram 2] 2A and 2B are diagrams showing an example of the maximum number of non-overlapping CCEs. [Diagram 3] FIG. 3 is a diagram illustrating an example of the first embodiment. [Figure 4] FIG. 4 is a diagram showing an example of the embodiment 2-1. [Diagram 5] FIG. 5 is a diagram showing an example of the embodiment 2-2. [Figure 6] 6A and 6B are diagrams showing an example of embodiment 2-3. [Figure 7] 7A and 7B are diagrams showing an example of embodiment 2-4. [Figure 8] 8A and 8B are diagrams showing an example of embodiment 3-1. [Figure 9] 9A and 9B are diagrams showing an example of embodiment 3-2. [Figure 10] 10A and 10B are diagrams illustrating an example of the fourth embodiment. [Figure 11] FIG. 11 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 12] FIG. 12 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 13] FIG. 13 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 14] FIG. 14 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

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

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

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

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

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

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

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

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

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

[0021] The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

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

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

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

[0025] (Multi-TRP) In NR, it is considered that one or more transmission / reception points (TRPs) (multi-TRPs (MTRPs)) will perform DL transmission to a UE using one or more panels (multi-panels). It is also considered that a UE will perform UL transmission to one or more TRPs using one or more panels.

[0026] Note that multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0027] Multi-TRP (e.g., TRP#1, #2) may be connected by ideal / non-ideal backhaul to exchange information, data, etc. Each TRP of the multi-TRP may transmit a different code word (CW) and a different layer. Non-Coherent Joint Transmission (NCJT) may be used as a form of multi-TRP transmission.

[0028] In the NCJT, for example, TRP#1 performs modulation mapping and layer mapping on a first codeword to transmit a first PDSCH using a first number of layers (e.g., two layers) with a first precoding, and TRP#2 performs modulation mapping and layer mapping on a second codeword to transmit a second PDSCH using a second number of layers (e.g., two layers) with a second precoding.

[0029] In addition, multiple PDSCHs (multi-PDSCHs) that are NCJTed may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap with at least one of the time and frequency resources.

[0030] The first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (QCL). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0031] Multiple PDSCHs from multiple TRPs (which may be referred to as multiple PDSCHs) may be scheduled using one DCI (single DCI, single PDCCH) (single-master mode, single-DCI based multi-TRP). Multiple PDSCHs from multiple TRPs may be scheduled using multiple DCIs (multiple DCI, multiple PDCCHs) respectively (multi-master mode, multi-DCI based multi-TRP).

[0032] In URLLC for multiple TRPs, it is considered that PDSCH (transport block (TB) or codeword (CW)) repetition across multiple TRPs is supported. It is considered that repetition schemes (URLLC schemes, for example, schemes 1, 2a, 2b, 3, and 4) across multiple TRPs in the frequency domain, layer (spatial) domain, or time domain are supported. In scheme 1, multiple PDSCHs from multiple TRPs are space division multiplexed (SDM). In schemes 2a and 2b, PDSCHs from multiple TRPs are frequency division multiplexed (FDM). In scheme 2a, the redundancy version (RV) is the same for multiple TRPs. In scheme 2b, the RVs may be the same or different for multiple TRPs. In schemes 3 and 4, multiple PDSCHs from multiple TRPs are time division multiplexed (TDM). In scheme 3, multiple PDSCHs from multiple TRPs are transmitted in one slot. In scheme 4, multiple PDSCHs from multiple TRPs are transmitted in different slots.

[0033] Such a multi-TRP scenario allows for more flexible transmission control using channels with better quality.

[0034] In order to support intra-cell (having the same cell ID) and inter-cell (having different cell IDs) multi-TRP transmission based on multiple PDCCHs, in the RRC configuration information for linking multiple pairs of PDCCHs and PDSCHs having multiple TRPs, one control resource set (CORESET) in the PDCCH configuration information (PDCCH-Config) may correspond to one TRP.

[0035] If at least one of the following conditions 1 and 2 is satisfied, the UE may determine that the TRP is based on the multi-DCI. In this case, the TRP may be replaced with a CORESET pool index. [Condition 1] A CORESET pool index of 1 is set. [Condition 2] Two different values ​​of the CORESET pool index (eg, 0 and 1) are set.

[0036] If the following conditions are met, the UE may determine that the UE is multi-TRP based on a single DCI. In this case, the two TRPs may be interpreted as two TCI states indicated by the MAC CE / DCI. [conditions] "Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE" is used to indicate one or two TCI states for one code point of the TCI field in the DCI.

[0037] The DCI for common beam instruction may be a UE-specific DCI format (e.g., DL DCI format (e.g., 1_1, 1_2), UL DCI format (e.g., 0_1, 0_2)) or a UE-group common DCI format.

[0038] (Multi-TRP PDCCH) For the reliability of multi-TRP PDCCH based on non-single frequency network (SFN), the following is considered: · Coding / rate matching is based on one repetition and the same coded bits are repeated in other repetitions. Each repetition has the same number of control channel elements (CCEs), the same coded bits, and corresponds to the same DCI payload. Two or more PDCCH candidates are explicitly linked together. The UE knows the link before decoding.

[0039] The following options for PDCCH repetition are considered: 1-2, 1-3, 2, 3.

[0040] [Options 1-2] Two sets of PDCCH candidates (within a given Search Space (SS) set) are associated with two TCI states of CORESET, respectively, where the same CORESET, the same SS set, and PDCCH repetitions on different monitoring occasions are used.

[0041] [Options 1-3] Two sets of PDCCH candidates are associated with two SS sets, respectively. Both SS sets are associated with a CORESET, and each SS set is associated with only one TCI state of that CORESET. Here, the same CORESET and two SS sets are used.

[0042] [Option 2] One SS set is associated with two different CORESETs.

[0043] [Option 3] Two SS sets are associated with two CORESETs respectively.

[0044] Thus, it is considered that two PDCCH candidates in two SS sets for PDCCH repetition are supported and the two SS sets are explicitly linked.

[0045] (Determination of PDCCH candidate allocation) In Rel.15 NR, for a common search space (CSS), the network (NW) ensures that no overbooking occurs. The UE is not expected to be configured with a CCS set that would cause the corresponding total number of monitored PDCCH candidates and non-overlapped control channel elements (CCEs) per slot or the number per scheduled cell to exceed the corresponding maximum number per slot.

[0046] In Rel.15 NR, for a secondary cell (SCell), the network (NW) ensures that no overbooking occurs based on the non-CA case. For cross-carrier scheduling or same-cell scheduling where the scheduling cell and the scheduled cell have multiple DL BWPs with the same subcarrier spacing (SCS) setting μ, the UE does not assume that the number of PDCCH candidates and non-overlapping CCEs per slot on the SCell is larger than the corresponding number that the UE can monitor on the SCell per slot.

[0047] The UE is not expected to monitor PDCCHs in a USS set that does not have a PDCCH allocated for monitoring.

[0048] First, PDCCH candidates for CSS are arranged, and then PDCCH candidates for UE-specific search spaces (USS) are arranged in ascending order of search space set index (ID) (starting from the lowest search space set ID).

[0049] CSS has a higher priority than USS.

[0050] All PDCCH candidates of USS sets with lower SS set IDs are mapped before PDCCH candidates of USS sets with higher SS set IDs. If all PDCCH candidates in an SS set (USS) cannot be mapped (there is not enough PDCCH candidate room (remaining PDCCH candidates up to the maximum number) for the SS set), the PDCCH candidates in that SS set and subsequent SS sets are dropped (not mapped). The SS sets after an SS set in the SS set ID order may be called subsequent SS sets.

[0051] If a higher layer index is configured per CORESET for a UE supporting multi-PDCCH (multi-DCI) based multi-TRP transmission, the UE may support the following principles for the maximum number of BDs and CCEs for multi-DCI based multi-TRP transmission:

[0052] For a CORESET configured for the same TRP (same upper layer index), the maximum number of monitored PDCCH candidates per slot in a DL BWP is limited by the Rel.15 limit M PDCCH max,slot,μ , the maximum number of non-overlapping CCEs is limited by the Rel.15 limit C PDCCH max,slot,μ The upper layer index may not exceed 1. The upper layer index may be configured for each PDCCH configuration information (PDCCH-Config) and for each CORESET. The upper layer index may correspond to the TRP.

[0053] The UE may indicate the capability of monitoring the PDCCH according to one or more combinations (X,Y). A span may be consecutive symbols in a slot for which the UE is configured to monitor the PDCCH. Each PDCCH monitoring occasion may be within a span. If the UE monitors the PDCCH on one cell according to combinations (X,Y), the UE supports multiple PDCCH monitoring occasions in any symbol of a slot with a minimum separation of X symbols between the first symbols of two consecutive spans, including across multiple slots. A span begins at the first symbol where a PDCCH monitoring occasion begins and ends at the last symbol where a PDCCH monitoring occasion ends, up to Y symbols in number.

[0054] The maximum number of monitored PDCCH candidates in one span M for combination (X, Y) in DL BWP with subcarrier spacing (SCS) setting μ ∈ {0,1} for a single serving cell PDCCH max,(X,Y),μ The maximum number of non-overlapping CCEs in one span for combination (X,Y) in DL BWP with subcarrier spacing (SCS) setting μ{0,1} for a single serving cell may be specified. PDCCH max,(X,Y),μ may be specified in the specification.

[0055] FIG. 1A illustrates the maximum number of monitored PDCCH candidates per slot M for DL ​​BWP with SCS configuration μ∈{0,1,2,3} for operation with a single serving cell. PDCCH max,slot,μ FIG. 1B shows the maximum number M of monitored PDCCH candidates in one span for combination (X, Y) in DL BWP with subcarrier spacing (SCS) setting μ∈{0,1} for a single serving cell. PDCCH max,(X,Y),μ Shows.

[0056] FIG. 2A shows the maximum number of non-overlapping CCEs per slot for DL ​​BWP with SCS configuration μ∈{0,1,2,3} for operation with a single serving cell. PDCCH max,slot,μ FIG. 2B shows the maximum number of non-overlapping CCEs M in one span for combination (X, Y) in DL BWP with subcarrier spacing (SCS) setting μ∈{0,1} for a single serving cell. PDCCH max,(X,Y),μ Shows.

[0057] If the CCEs for PDCCH candidates correspond to different CORESET indices or different first symbols for reception of the respective PDCCH candidates, then those CCEs do not overlap.

[0058] If Σ μ=0 3 N cells DL,μ ≦N cells cap and the UE has DL BWP with SCS configuration μ cells DL,μ DL cells are configured, the UE shall transmit M PDCCH total,slot,μ =M PDCCH max,slot,μ More than C PDCCH candidates PDCCH total,slot,μ =C PDCCH max,slot,μ N cells cap may be the value of the capability information (pdcch-BlindDetectionCA) provided by the UE, or may be the configured number of DL cells.

[0059] Two PDCCH candidates (repetitions) with linkage may be decoded by the UE using soft combining. The following assumptions are considered regarding how to count towards the BD / CCE limit:

[0060] [Assumption 0] At the BD limit, the complexity associated with RE demapping / demodulation requires two units.

[0061] [Assumption 0-1] In the BD limit, one or more units of complexity are required for decoding. The UE only decodes the combined candidate without decoding the individual PDCCH candidates. The reason for "more" is that soft combining has additional complexity associated with storage. In this case, blockage can impact performance (not separate decoding). It is also implied that in this case the base station (gNB) needs to always transmit both PDCCH candidates (i.e. the base station cannot pick only one).

[0062] [Assumption 0-2] In the BD limit, the complexity associated with decoding requires two units. The UE decodes each individual PDCCH candidate. No soft combining is considered for BD.

[0063] [Assumption 0-3] In the BD restriction, more than one unit is required for the complexity associated with the decoding. The UE decodes the first PDCCH candidate and also decodes the combined candidate. In this case, if the first PDCCH candidate is blocked (due to PDCCH blocking or due to interference), the second decoding is affected (in addition to the first decoding). It is also implied that in this case, the base station (gNB) cannot choose to transmit only DCI in the second PDCCH candidate.

[0064] [Assumption 0-4] At the BD limit, the complexity associated with the decoding requires three units: the UE decodes each PDCCH candidate separately and also decodes the combined candidate.

[0065] In the case of PDCCH repetition using soft combining, the linkage between two PDCCH candidates is taken into account when counting up to the BD / CCE limit. However, the procedure for PDCCH overbooking (PDCCH candidate allocation) is not clear.

[0066] Therefore, the present inventors have come up with a method for counting / allocating PDCCH candidates.

[0067] 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.

[0068] In the present disclosure, "A / B / C" and "at least one of A, B, and C" may be read as interchangeable. In the present disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read as interchangeable. In the present disclosure, index, ID, indicator, and resource ID may be read as interchangeable. In the present disclosure, support, control, controllable, operate, and operable may be read as interchangeable.

[0069] In the present disclosure, the terms configure, activate, update, indicate, enable, specify, and select may be read as interchangeable.

[0070] In this disclosure, link, associate, correspond, map, repeat, and relate may be read as interchangeable. In this disclosure, allocate, assign, monitor, and map may be read as interchangeable.

[0071] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameters, higher layer, higher layer parameters, RRC information elements (IEs), and RRC messages may be read as interchangeable.

[0072] The MAC signaling may be, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0073] In the present disclosure, MAC CE and activation / deactivation command may be read as interchangeable.

[0074] In the present disclosure, beam, spatial domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, TCI assumption, QCL assumption, QCL parameter, spatial domain receive filter, UE spatial domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS of QCL type D in TCI state / QCL assumption, RS of QCL type A in TCI state / QCL assumption, spatial relationship, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, PL-RS, may be read as interchangeable. In the present disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type X, source of DL-RS, SSB, CSI-RS, SRS, may be read as interchangeable.

[0075] In the present disclosure, panel, Uplink (UL) transmitting entity, TRP, spatial relationship, control resource set (COntrol REsource SET (CORESET)), PDSCH, codeword, base station, antenna port of a certain signal (e.g., DeModulation Reference Signal (DMRS) port), antenna port group of a certain signal (e.g., DMRS port group), group for multiplexing (e.g., Code Division Multiplexing (CDM) group, reference signal group, CORESET group), CORESET pool, CORESET subset, CW, redundancy version (RV), layer (MIMO layer, transmission layer, spatial layer), may be read as mutually interchangeable. Also, panel identifier (ID) and panel may be read as mutually interchangeable. In the present disclosure, TRP ID and TRP may be read as mutually interchangeable.

[0076] In the present disclosure, a TRP, a transmission point, a panel, a DMRS port group, a CORESET pool, and one of two TCI states associated with one code point in a TCI field may be read as interchangeable.

[0077] In the present disclosure, single TRP, single TRP system, single TRP transmission, and single PDSCH may be interchangeable. In the present disclosure, multi-TRP, multi-TRP system, multi-TRP transmission, and multi-PDSCH may be interchangeable. In the present disclosure, single DCI, single PDCCH, multi-TRP based on single DCI, and activating two TCI states on at least one TCI codepoint may be interchangeable.

[0078] In the present disclosure, a single TRP, a channel using a single TRP, a channel using one TCI state / spatial relationship, multi-TRP not being enabled by RRC / DCI, multiple TCI states / spatial relationships not being enabled by RRC / DCI, a CORESETPoolIndex value of 1 not being set for any CORESET, and no code point in the TCI field being mapped to two TCI states may be read as interchangeable.

[0079] In the present disclosure, multi-TRP, channel using multi-TRP, channel using multiple TCI states / spatial relationships, multi-TRP being enabled by RRC / DCI, multiple TCI states / spatial relationships being enabled by RRC / DCI, and at least one of multi-TRP based on a single DCI and multi-TRP based on a multiple DCI may be read as mutually interchangeable. In the present disclosure, multi-TRP based on a multiple DCI, and a CORESETPoolIndex value of 1 being set for CORESET may be read as mutually interchangeable. In the present disclosure, multi-TRP based on a single DCI, and at least one code point of a TCI field being mapped to two TCI states may be read as mutually interchangeable.

[0080] In the present disclosure, TRP#1 (first TRP) may correspond to CORESET pool index=0 or may correspond to the first of two TCI states corresponding to one code point in the TCI field. TRP#2 (second TRP) TRP#1 (first TRP) may correspond to CORESET pool index=1 or may correspond to the second of two TCI states corresponding to one code point in the TCI field.

[0081] In the present disclosure, DMRS, DMRS port, and antenna port may be interpreted as interchangeable.

[0082] In the present disclosure, the number of monitored PDCCH candidates and the number of blind detections (BD) may be interchangeable. The number of non-overlapping CCEs, the number of CCEs for channel estimation, and the number of CCEs may be interchangeable.

[0083] In the present disclosure, the terms limit, upper limit, limit, restriction, and maximum number may be read as interchangeable.

[0084] In the present disclosure, slot, span, consecutive symbols, and time domain resource may be interpreted as interchangeable.

[0085] (Wireless communication method) Considering that PDCCH candidates are arranged for each slot / span, either of the following assumptions 1 and 2 may be assumed.

[0086] [Assumption 1] Multiple PDCCH candidates for repetition are in the same (single) slot / span.

[0087] In contrast to Assumption 1, taking into consideration that multiple PDCCH candidates are allocated within a unit of an SS set, either of the following Assumptions 1-1 and 1-2 is assumed.

[0088] [[Assumption 1-1]] Multiple PDCCH candidates are in the same (single) SS set.

[0089] [[Assumptions 1-2]] The multiple PDCCH candidates are in different (multiple) SS sets.

[0090] [Assumption 2] The multiple PDCCH candidates for repetition are in different slots / spans.

[0091] The linkage between the two SS sets / PDCCH candidates may be specified or configured.

[0092] The terms "SS set / PDCCH candidate / PDCCH candidate within the SS set can be arranged," "There is room for sufficient PDCCH candidates / non-overlapping CCEs for the SS set / PDCCH candidate / PDCCH candidate within the SS set," "There are a maximum number of remaining PDCCH candidates / non-overlapping CCEs for the PDCCH candidates within the SS set / PDCCH candidate / SS set," and "There are sufficient PDCCH candidates / non-overlapping CCEs for the PDCCH candidates within the SS set / PDCCH candidate / SS set" may be read as interchangeable.

[0093] <First embodiment> In assumption 1-1 (case where multiple PDCCH candidates are in the same (single) slot / span and the multiple PDCCH candidates are in the same (single) SS set), the procedure for counting up to the maximum number of PDCCH candidates that the UE can monitor for one SS set (procedure for arranging PDCCH candidates) may be as follows.

[0094] Two PDCCH candidates with linkage may be counted as 1 / 2 / 3 / 4 (at least one of 1, 2, 3, and 4). Multiple values ​​from 1 / 2 / 3 / 4 may be supported. The support of multiple values ​​may depend on at least one of configuration and UE capabilities. For example, according to existing procedures, two PDCCH candidates with linkage are counted as 2.

[0095] This embodiment may be applied to Option 1-2 / Option 2 above.

[0096] In the example of FIG. 3, CORESET1 and CORESET2 are associated with a search space set (SSS1) CORESET1. A PDCCH candidate in CORESET1 and a PDCCH candidate in CORESET2 have a linkage. The two PDCCH candidates are counted as 1 / 2 / 3 / 4. According to this method, the PDCCH candidates that the UE can monitor for one SS set may be counted up to the maximum number.

[0097] According to this embodiment, multiple PDCCH candidates in the same (single) slot / span and in the same (single) SS set can be properly counted / located.

[0098] <Second embodiment> In assumption 1-2 (where multiple PDCCH candidates are in the same (single) slot / span and the multiple PDCCH candidates are in different (multiple) SS sets), the procedure for counting up to the maximum number of PDCCH candidates that the UE can monitor for two SS sets having linkage (procedure for arranging PDCCH candidates) may follow any of the following aspects 2-1 to 2-4.

[0099] <<Aspect 2-1>> The two PDCCH candidates in the two SS sets are counted and positioned independently (similar to existing procedures).

[0100] When counting for the SS set with the lower ID of the two SS sets, if one PDCCH candidate is linked to another PDCCH candidate, the number of PDCCH candidates may be counted as one.

[0101] When counting for SS sets with higher IDs, if one PDCCH candidate is linked to another PDCCH candidate, the number of PDCCH candidates may be counted as 1. In this case, considering the additional complexity of soft combining, the number of PDCCH candidates may be counted as 2 or 3. Multiple values ​​from 1 / 2 / 3 may be supported. The support of multiple values ​​may depend on at least one of the configuration and UE capabilities.

[0102] The PDCCH candidates may be arranged in ascending order of SS Set ID from lowest to highest (similar to existing procedures).

[0103] If there are not enough PDCCH candidates (room for PDCCH candidates, number of remaining PDCCH candidates up to the maximum number) for a certain SS set, all PDCCH candidates in that SS set may not be configured (dropped) (similar to existing procedures).

[0104] In this case, it may happen that the first PDCCH candidate is configured and the second PDCCH candidate is dropped (not configured).

[0105] In the example of FIG. 4, PDCCH candidates #1 and #2 are configured in an SS set (SS set #0) having an SS set ID=0, and PDCCH candidates #1 and #2 are configured in an SS set (SS set #2) having an SS set ID=2. PDCCH candidate #1 in SS set #0 and PDCCH candidate #1 in SS set #2 have a linkage, and PDCCH candidate #2 in SS set #0 and PDCCH candidate #2 in SS set #2 have a linkage. PDCCH candidates #1 and #2 in SS set #0 are arranged in ascending order of SS set ID. After that, if there is no room to arrange PDCCH candidates #1 and #2 in SS set #2 (the number of remaining PDCCH candidates up to the maximum number) by comparing the count of the arranged PDCCH candidates with the maximum number, PDCCH candidates #1 and #2 in SS set #2 are dropped (not arranged).

[0106] "Aspect 2-2" The two PDCCH candidates in the two SS sets are counted and arranged independently. In the PDCCH candidate arrangement procedure, the priority of linked SS sets / PDCCH candidates is increased.

[0107] In the procedure of PDCCH candidate configuration, when multiple PDCCH candidates in one SS set are configured, the later linked PDCCH candidates / SS sets (associated with higher IDs) may be configured with higher priority. The configuration of PDCCH candidates may follow either of the following configuration methods 1 and 2.

[0108] [Placement method 1] All PDCCH candidates within a linked SS set may be placed with a higher priority.

[0109] In the example of FIG. 5, SS sets #0 to #3 (SS sets having SS set IDs = 0 to 3) are configured, PDCCH candidates #1 to #3 are configured in SS set #0, and PDCCH candidates #1 to #3 are configured in SS set #2. PDCCH candidate #1 in SS set #0 has a linkage with PDCCH candidate #1 in SS set #2, and PDCCH candidate #2 in SS set #0 has a linkage with PDCCH candidate #2 in SS set #2. For example, according to the configuration method 1 (descending order of priority, then ascending order of SS set ID), SS set #0, SS set #2, SS set #1, and SS set #3 are configured in this order. If, after the PDCCH candidate in SS set #0 is configured, a comparison is made between the count of the PDCCH candidates to be configured and the maximum number, and there is no room to configure the PDCCH candidate in SS set #2 (the number of remaining PDCCH candidates up to the maximum number), the PDCCH candidate is dropped (not configured).

[0110] [Placement method 2] PDCCH candidates (only) with linkage may be arranged with a higher priority. For example, according to arrangement method 2 (PDCCH candidates with linkage, then ascending order of SS set ID), in the example of Fig. 5, SS set #0, PDCCH candidates #1 and #2 in SS set #2, SS set #1, PDCCH candidates #1 and #2 in SS set #2, SS set #3 are arranged in this order. If, after the PDCCH candidate in SS set #0 is arranged, there is no room to arrange the PDCCH candidate in SS set #2 (the number of remaining PDCCH candidates up to the maximum number) by comparing the count of the arranged PDCCH candidates with the maximum number, the PDCCH candidate is dropped (not arranged).

[0111] Within the same priority, PDCCH candidates may be arranged in ascending order of SS Set ID from lowest to highest (similar to existing procedures).

[0112] The rest of the embodiment 2-2 may be the same as the embodiment 2-1.

[0113] In this case, it may happen that the first PDCCH candidate is configured and the second PDCCH candidate is dropped (not configured).

[0114] "Aspect 2-3" Two SS sets having linkage are counted together and co-located. All PDCCH candidates in the two SS sets may be counted together and co-located. This embodiment is preferred when all PDCCH candidates in the two SS sets are configured with linkage. This embodiment may be applied when all or some PDCCH candidates are configured with linkage.

[0115] When counting for an SS set with a lower ID, the SS sets linked to it may be counted together. If one PDCCH candidate is linked to another PDCCH candidate, the number of PDCCH candidates to be configured may be counted as 1 / 2 / 3 / 4. Multiple values ​​from 1 / 2 / 3 / 4 may be supported. Support of multiple values ​​may depend on at least one of configuration and UE capabilities. If all PDCCH candidates in two SS sets can be configured, all PDCCH candidates in both of the two SS sets may not be configured. If there are not enough PDCCH candidates (room for PDCCH candidates, number of remaining PDCCH candidates up to the maximum number) for all PDCCH candidates in two SS sets, all PDCCH candidates in both of the two SS sets may not be configured (dropped).

[0116] When counting for an SS set with a higher ID, if a PDCCH candidate in that SS set is linked with a previously configured PDCCH candidate, the number of configured PDCCH candidates may be counted as 0.

[0117] In this case, the two SS sets (PDCCH candidates therein) having linkage may all be configured. In the example of FIG. 6A, PDCCH candidates #1 and #2 in SS set #0 and PDCCH candidates #1 and #2 in SS set #2 are configured. PDCCH candidate #1 in SS set #0 and PDCCH candidate #1 in SS set #2 have linkage, and PDCCH candidate #2 in SS set #0 and PDCCH candidate #2 in SS set #2 have linkage. PDCCH candidate #1 in SS set #0 is counted as 2. PDCCH candidate #1 in SS set #2 linked to it is not counted. PDCCH candidate #2 in SS set #0 is counted as 2. PDCCH candidate #2 in SS set #2 linked to it is not counted. If the counts of PDCCH candidates #1, #2 in SS set #0 and PDCCH candidates #1, #2 in SS set #2 (if there is room) are less than or equal to the maximum number, all of these PDCCH candidates are configured.

[0118] In this case, the two SS sets (PDCCH candidates in) having linkage may all be dropped. In the example of Fig. 6B, PDCCH candidate #1 in SS set #0 and PDCCH candidate #1 in SS set #2 have linkage, and PDCCH candidate #2 in SS set #0 and PDCCH candidate #2 in SS set #2 have linkage. If the counts of PDCCH candidates #1 and #2 in SS set #0 and PDCCH candidates #1 and #2 in SS set #2 (when there is no room) exceed the maximum number, all these PDCCH candidates are dropped (not arranged).

[0119] <<Aspect 2-4>> Two PDCCH candidates with linkage are counted together and co-located. Only PDCCH candidates with linkage in two SS sets may be counted together and co-located. This embodiment is preferable when some (part of) PDCCH candidates in two SS sets are configured with linkage and other PDCCH candidates in two SS sets are configured without linkage.

[0120] When counting for SS sets with lower IDs, if one PDCCH candidate is linked with another PDCCH candidate, the number of configured PDCCH candidates may be counted as 1 / 2 / 3 / 4. Multiple values ​​from 1 / 2 / 3 / 4 may be supported. Support of multiple values ​​may depend on at least one of configuration and UE capabilities. If all PDCCH candidates in a first SS set and PDCCH candidates linked to that PDCCH candidate in a second SS set can be configured, all PDCCH candidates in the first SS set and PDCCH candidates linked to that PDCCH candidate in the second SS set may be configured. If there are not enough PDCCH candidates (room for PDCCH candidates, number of remaining PDCCH candidates up to the maximum number) for all PDCCH candidates in the first SS set and the PDCCH candidates linked to those PDCCH candidates in the second SS set, then all PDCCH candidates in the first SS set and the PDCCH candidates linked to those PDCCH candidates in the second SS set may not be placed (dropped).

[0121] When counting for an SS set with a higher ID, if a PDCCH candidate in that SS set is linked with a previously placed PDCCH candidate, the number of placed PDCCH candidates may be counted as 0.

[0122] In this case, the two SS sets (PDCCH candidates therein) having linkage may all be configured. In the example of FIG. 7A, PDCCH candidates #1 to #3 in SS set #0 and PDCCH candidates #1 to #3 in SS set #2 are configured. PDCCH candidate #1 in SS set #0 and PDCCH candidate #1 in SS set #2 have linkage, and PDCCH candidate #2 in SS set #0 and PDCCH candidate #2 in SS set #2 have linkage. PDCCH candidate #1 in SS set #0 is counted as 2 because it is configured and has linkage. PDCCH candidate #1 in SS set #0 is counted as 2. PDCCH candidate #1 in SS set #2 linked to it is not counted. PDCCH candidate #2 in SS set #0 has linkage and is counted as 2. PDCCH candidate #2 in SS set #2 linked to it is not counted. PDCCH candidate #2 in SS set #0 has linkage and is counted as 2. PDCCH candidate #2 in SS set #2 linked to it is not counted. PDCCH candidate #3 in SS set #0 has no linkage and is therefore counted as 1. The counting of PDCCH candidate #3 in SS set #2 may follow existing procedures. If the counts of PDCCH candidates #1, #2, #3 in SS set #0 and PDCCH candidates #1, #2 in SS set #2 (if there is room) are less than or equal to the maximum number, all of these PDCCH candidates are configured.

[0123] In this case, the two SS sets (PDCCH candidates in) having linkage may all be dropped. In the example of FIG. 7B, PDCCH candidate #1 in SS set #0 and PDCCH candidate #1 in SS set #2 have linkage, and PDCCH candidate #2 in SS set #0 and PDCCH candidate #2 in SS set #2 have linkage. The count of PDCCH candidate #3 in SS set #2 may follow the existing procedure. If the count of PDCCH candidates #1, #2, #3 in SS set #0 and PDCCH candidates #1, #2 in SS set #2 exceeds the maximum number (when there is no room), all these PDCCH candidates are dropped (not arranged).

[0124] This embodiment allows for proper counting / location of multiple PDCCH candidates within the same (single) slot / span but in different (multiple) SS sets.

[0125] <Analysis> According to the above aspects 2-3 and 2-4, if two PDCCH candidates are in the same slot / span, the PDCCH candidates in the two SS sets with linkage are counted together. PDCCH candidates are configured or dropped at the SS set level. As in Rel.15 / 16, if two linked SS sets cannot be configured, all subsequent SS sets cannot be configured.

[0126] However, with two SS sets counted together, the possibility that there is not enough PDCCH candidate room (remaining PDCCH candidates up to the maximum number) is higher than in Rel.15 / 16. Further enhancements may be made to the overbooking (PDCCH candidate allocation) procedure to ensure that more PDCCH candidates are allocated. The following assumption 3 may be assumed:

[0127] [Assumption 3] ·Two PDCCH candidates in two SS sets with corresponding multiple CORESETs are used for multi-TRP PDCCH repetition. · Two PDCCH candidates / two SS sets / two CORESETs are explicitly linked to each other. The linkage may be determined by rules defined in the specification or may be set by higher layer signaling. · The two linked PDCCH candidates for a repetition are in the same slot / span.

[0128] <Third embodiment> If both of the two linked PDCCH candidates cannot be configured, it is allowed to fall back to the existing procedure. This embodiment may be applied to scenario 3.

[0129] The UE may follow at least one of the following aspects 3-1 and 3-2.

[0130] <<Aspect 3-1>> Two SS sets with linkage (e.g., SS set x and SS set y) are counted together and arranged together. This is an extension based on aspect 2-3.

[0131] If all PDCCH candidates in the two SS sets can be configured, then all PDCCH candidates in both of the two SS sets may be configured.

[0132] After the two sets are configured, the UE / base station may proceed to step 3-1-1 below (reuse existing procedure).

[0133] [Step 3-1-1] The UE / base station may determine whether the next SS set of the two SS sets with the lower ID (e.g., SS set x) can be deployed. The order of deployment / determination may be based on the order of SS set IDs from lower ID to higher ID. If there is enough PDCCH candidate room (number of remaining PDCCH candidates up to maximum) / non-overlapping CCE room (number of remaining non-overlapping CCEs up to maximum), the next SS set may be deployed.

[0134] 8A and 8B, PDCCH candidates #1 and #2 in SS set #0 (SS set ID=0) and PDCCH candidates #1 and #2 in SS set #2 (SS set ID=2) are configured. PDCCH candidate #1 in SS set #0 and PDCCH candidate #1 in SS set #2 have a linkage, and PDCCH candidate #2 in SS set #0 and PDCCH candidate #2 in SS set #2 have a linkage.

[0135] In the example of FIG. 8A, if there is room for sufficient PDCCH candidates / non-overlapping CCEs for SS sets #0 and #2, then SS sets #0 and #2 are deployed.

[0136] If there is not enough room for PDCCH candidates (remaining number of PDCCH candidates up to the maximum number) / non-overlapping CCEs (remaining number of non-overlapping CCEs up to the maximum number) for all PDCCH candidates in the two SS sets, the UE / base station may fall back to the following existing procedure 3-1-2 (reuse of existing procedure).

[0137] [Step 3-1-2] If there is enough PDCCH candidate room (number of remaining PDCCH candidates up to the maximum) / non-overlapping CCE room (number of remaining non-overlapping CCEs up to the maximum) for the PDCCH candidates in the SS set with the lower ID of the two SS sets (e.g., SS set x), then SS set x may be deployed. After SS set x is deployed, the UE / base station may determine whether the next SS set of SS set x can be deployed. The order of deployment may be based on the order of SS set IDs from low ID to high ID. If there is enough PDCCH candidate room (number of remaining PDCCH candidates up to the maximum) / non-overlapping CCE room (number of remaining non-overlapping CCEs up to the maximum), then the next SS set may be deployed.

[0138] In the example of Figure 8B, if there is not enough room for PDCCH candidates / non-overlapping CCEs for SS sets #0 and #2, and there is enough room for PDCCH candidates / non-overlapping CCEs for PDCCH candidates in SS set #0 (lower ID), then SS set #0 is configured and SS set #2 is dropped (not configured).

[0139] "Aspect 3-2" Two PDCCH candidates in two SS sets that have linkage (eg, SS set x and SS set y) are counted together and co-located, which is an extension based on aspect 2-4.

[0140] If all PDCCH candidates (e.g., multiple PDCCH candidates a) in the SS set with a lower ID (e.g., SS set x) of the two SS sets and the PDCCH candidates (e.g., multiple PDCCH candidates b) linked to those PDCCH candidates a in the SS set with a higher ID (e.g., SS set y) can be configured, PDCCH candidates a and PDCCH candidates b may be configured.

[0141] After that placement, it may be determined whether the next SS set of SS set x can be placed. The placement order may be based on the order of SS set IDs from low ID to high ID. If there is enough PDCCH candidate room (number of remaining PDCCH candidates up to the maximum) / non-overlapping CCE room (number of remaining non-overlapping CCEs up to the maximum), the next SS set may be placed.

[0142] 9A and 9B, PDCCH candidates #1 and #2 in SS set #0 (SS set ID=0) and PDCCH candidates #1, #2, and #3 in SS set #2 (SS set ID=2) are configured. PDCCH candidate #1 in SS set #0 and PDCCH candidate #1 in SS set #2 have a linkage, and PDCCH candidate #2 in SS set #0 and PDCCH candidate #2 in SS set #2 have a linkage.

[0143] In the example of Figure 9A, if there is room for sufficient PDCCH candidates / non-overlapping CCEs for PDCCH candidates #1, #2 in SS set #0 and PDCCH candidates #1, #2 in SS set #2 linked thereto, then PDCCH candidates #1, #2 in SS set #0 and PDCCH candidates #1, #2 in SS set #2 linked thereto are arranged. For PDCCH candidate #3 in SS set #2, the existing procedure is followed.

[0144] If there is not enough PDCCH candidate room (remaining number of PDCCH candidates up to the maximum number) / non-overlapping CCE room (remaining number of non-overlapping CCEs up to the maximum number) for all PDCCH candidates (e.g., multiple PDCCH candidates a) in the SS set with a lower ID (e.g., SS set x) of the two SS sets and for the PDCCH candidates (e.g., multiple PDCCH candidates b) linked to those PDCCH candidates a in the SS set with a higher ID (e.g., SS set y), the UE / base station may fall back to the following existing procedure 3-2 (reuse of existing procedure).

[0145] [Step 3-2] If there is enough PDCCH candidate room (number of remaining PDCCH candidates up to the maximum) / non-overlapping CCE room (number of remaining non-overlapping CCEs up to the maximum) for the PDCCH candidates in the SS set with the lower ID of the two SS sets (e.g., SS set x), then SS set x may be deployed. After SS set x is deployed, the UE / base station may determine whether the next SS set of SS set x can be deployed. The order of deployment may be based on the order of SS set IDs from low ID to high ID. If there is enough PDCCH candidate room (number of remaining PDCCH candidates up to the maximum) / non-overlapping CCE room (number of remaining non-overlapping CCEs up to the maximum), then the next SS set may be deployed.

[0146] In the example of Figure 9B, if there is not enough room for PDCCH candidates / non-overlapping CCEs for PDCCH candidates #1, #2 in SS set #0 and PDCCH candidates #1, #2 in SS set #2 linked to them, and there is enough room for PDCCH candidates / non-overlapping CCEs for the PDCCH candidates in SS set #0 (lower ID), then SS set #0 will be configured and SS set #2 will be dropped (not configured).

[0147] This embodiment allows for proper counting / location of multiple PDCCH candidates within the same (single) slot / span but in different (multiple) SS sets.

[0148] <Fourth embodiment> A plurality of PDCCH candidates are configured or dropped at the PDCCH candidate level (as a unit of the PDCCH candidate). This embodiment may be applied to Assumption 3.

[0149] The UE / base station may configure PDCCH candidates at the PDCCH candidate level (PDCCH candidate unit). Two PDCCH candidates that have linkage may be counted together and configured together.

[0150] The UE / base station may arrange the PDCCH candidates within each SS set based on the order of PDCCH candidate IDs from lowest ID to highest ID.

[0151] If the order reaches a PDCCH candidate that does not have linkage, the UE / base station may determine whether the PDCCH can be placed. If there is enough room for PDCCH candidates (number of remaining PDCCH candidates up to the maximum number) / room for non-overlapping CCEs (number of remaining non-overlapping CCEs up to the maximum number) for the PDCCH candidate, the PDCCH candidate may be placed. If there is not enough room for PDCCH candidates (number of remaining PDCCH candidates up to the maximum number) / room for non-overlapping CCEs (number of remaining non-overlapping CCEs up to the maximum number) for the PDCCH candidate, the PDCCH candidate and the following PDCCH candidates may not be placed.

[0152] If the order reaches a PDCCH candidate (e.g., PDCCH candidate x) that is linked with another PDCCH candidate, the UE / base station may determine whether the two linked PDCCH candidates can be placed. If there is enough PDCCH candidate room (number of remaining PDCCH candidates up to the maximum number) / non-overlapping CCE room (number of remaining non-overlapping CCEs up to the maximum number) for the two linked PDCCH candidates, the two linked PDCCH candidates may be placed. If there is not enough PDCCH candidate room (number of remaining PDCCH candidates up to the maximum number) / non-overlapping CCE room (number of remaining non-overlapping CCEs up to the maximum number) for the two linked PDCCH candidates, the UE / base station may follow either of the following options 1 and 2.

[0153] [Option 1] The two linked PDCCH candidates and the subsequent PDCCH candidates are not placed.

[0154] 10A and 10B, PDCCH candidates #1 (PDCCH candidate ID=1) and #2 (PDCCH candidate ID=2) in SS set #0 (SS set ID=0) and PDCCH candidates #1 (PDCCH candidate ID=1) and #2 (PDCCH candidate ID=2) in SS set #2 (SS set ID=2) are set. PDCCH candidate #1 in SS set #0 and PDCCH candidate #1 in SS set #2 have a linkage, and PDCCH candidate #2 in SS set #0 and PDCCH candidate #2 in SS set #2 have a linkage.

[0155] In the example of Figure 10A, if there is room for sufficient PDCCH candidates / non-overlapping CCEs for PDCCH candidate #1 in SS set #0 and PDCCH candidate #1 in SS set #2 linked to it, and there is not room for sufficient PDCCH candidates / non-overlapping CCEs for PDCCH candidate #1 in SS set #0 and PDCCH candidate #1 in SS set #2 linked to it, and PDCCH candidate #2 in SS set #0 and PDCCH candidate #2 in SS set #2 linked to it, then PDCCH candidate #1 in SS set #0 and PDCCH candidate #1 in SS set #2 are configured, and PDCCH candidate #2 in SS set #0 and PDCCH candidate #2 in SS set #2 are dropped (not configured).

[0156] [Option 2] The UE / base station determines whether PDCCH candidate x can be configured. If there is enough PDCCH candidate room (number of remaining PDCCH candidates up to the maximum number) / non-overlapping CCE room (number of remaining non-overlapping CCEs up to the maximum number) for PDCCH candidate x, PDCCH candidate x may be configured. After PDCCH candidate x is configured, the UE / base station may determine whether the next PDCCH candidate of PDCCH candidate x can be configured based on the order of PDCCH candidate IDs.

[0157] In the example of Figure 10B, if there is room for sufficient PDCCH candidates / non-overlapping CCEs for PDCCH candidate #1 in SS set #0, PDCCH candidate #1 in its linked SS set #2, and PDCCH candidate #2 in SS set #0, but there is not room for sufficient PDCCH candidates / non-overlapping CCEs for PDCCH candidate #1 in SS set #0, PDCCH candidate #1 in its linked SS set #2, PDCCH candidate #2 in SS set #0, and PDCCH candidate #2 in its linked SS set #2, then PDCCH candidate #1 in SS set #0, PDCCH candidate #1 in SS set #2, and PDCCH candidate #2 in SS set #0 are configured, and PDCCH candidate #2 in SS set #2 is dropped (not configured).

[0158] This embodiment allows for proper counting / location of multiple PDCCH candidates within the same (single) slot / span but in different (multiple) SS sets.

[0159] <Fifth embodiment> An upper layer parameter (RRC information element) / UE capability corresponding to at least one function (feature) in the first to fourth embodiments may be defined. The UE capability may indicate that the function is supported.

[0160] A UE in which a higher layer parameter corresponding to the function is configured may perform the function. It may be specified that "a UE in which a higher layer parameter corresponding to the function is not configured does not perform the function."

[0161] A UE that has reported a UE capability indicating that it supports the function may perform the function. It may also be specified that "a UE that has not reported a UE capability indicating that it supports the function shall not perform the function."

[0162] If the UE reports a UE capability indicating that the UE supports the function and a corresponding upper layer parameter is configured, the UE may perform the function. It may also be specified that "if the UE does not report a UE capability indicating that the UE supports the function or a corresponding upper layer parameter is not configured, the UE shall not perform the function."

[0163] The UE capabilities may indicate whether PDCCH repetition is supported or not.

[0164] The UE capabilities may indicate whether or not it supports falling back to existing procedures (third embodiment / aspect 3-1) in the case of SS set level PDCCH configuration when both of the two linked SS sets / PDCCH candidates cannot be configured.

[0165] The UE capability may indicate whether or not it supports, in the case of SS set level PDCCH configuration, one of two linked SS sets / PDCCH candidates being configured when both of the linked SS sets / PDCCH candidates cannot be configured (third embodiment / aspect 3-2).

[0166] The UE capability may indicate whether or not it supports PDCCH candidate placement at the PDCCH candidate level (fourth embodiment).

[0167] The UE capabilities may indicate whether, in the case of PDCCH candidate level PDCCH configuration, it supports one of the two linked SS sets / PDCCH candidates being configured if both of the linked SS sets / PDCCH candidates cannot be configured (fourth embodiment / option 2).

[0168] According to this embodiment, the UE can achieve the above functions while maintaining compatibility with existing specifications.

[0169] (Wireless communication systems) A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination of these methods.

[0170] 11 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), or the like, which are specified by the Third Generation Partnership Project (3GPP).

[0171] Furthermore, the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0172] 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.

[0173] The wireless communication system 1 may support dual connectivity between multiple base stations in the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0174] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged in the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1. A user terminal 20 may be located in at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as a base station 10.

[0175] 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).

[0176] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0177] Furthermore, the user terminal 20 may perform communication in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0178] The multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0179] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0180] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0181] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

[0182] The radio access scheme may be called a waveform. In the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0183] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as a downlink channel.

[0184] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0185] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0186] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information of at least one of the PDSCH and the PUSCH.

[0187] In addition, DCI for scheduling PDSCH may be called DL assignment, DL DCI, etc., and DCI for scheduling PUSCH may be called UL grant, UL DCI, etc. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

[0188] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or multiple search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0189] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in the present disclosure may be read as interchangeable terms.

[0190] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and a scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0191] In the present disclosure, a downlink, an uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning of the channels.

[0192] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0193] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) may be called an SS / PBCH block, an SS Block (SSB), or the like. In addition, the SS, SSB, and the like may also be called a reference signal.

[0194] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may be called a user equipment specific reference signal (UE-specific reference signal).

[0195] (base station) 12 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may be provided.

[0196] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0197] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0198] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission and reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0199] 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.

[0200] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0201] The transmitting / receiving antenna 130 can be composed of an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0202] 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.

[0203] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0204] 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.

[0205] The transceiver 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0206] The transceiver unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna .

[0207] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna .

[0208] 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.

[0209] 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.

[0210] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data) for the user terminal 20, control plane data, etc.

[0211] 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.

[0212] The control unit 110 may determine whether two physical downlink control channel (PDCCH) candidates can be configured among a plurality of PDCCH candidates. If it is determined that the two PDCCH candidates can be configured, the transceiver unit 120 may transmit a PDCCH in at least one of the two PDCCH candidates. The two PDCCH candidates may be in the same slot or the same span. The two PDCCH candidates may be associated with two search space sets, respectively. The two PDCCH candidates may be linked to each other. If it is determined that the two PDCCH candidates cannot be configured, the control unit 110 may determine whether one or more PDCCH candidates can be configured among the plurality of PDCCH candidates.

[0213] (User terminal) 13 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230.

[0214] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0215] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0216] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission / reception unit 220.

[0217] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting / receiving circuit, and the like, which are described based on common understanding in the technical field related to the present disclosure.

[0218] 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.

[0219] The transmitting / receiving antenna 230 can be composed of an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.

[0220] 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.

[0221] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0222] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0223] The transceiver 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0224] Whether or not to apply the DFT process may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver 220 (transmission processor 2211) may perform the DFT process as the transmission process to transmit the channel using a DFT-s-OFDM waveform, and may not perform the DFT process as the transmission process if transform precoding is enabled for the channel.

[0225] The transceiver unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna 230.

[0226] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna 230.

[0227] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0228] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0229] In addition, the transmitting section and the receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0230] The control unit 210 may determine whether two physical downlink control channel (PDCCH) candidates can be configured among a plurality of PDCCH candidates. If it is determined that the two PDCCH candidates can be configured, the transceiver unit 220 may receive the two PDCCH candidates. The two PDCCH candidates may be in the same slot or the same span. The two PDCCH candidates may be associated with two search space sets, respectively. The two PDCCH candidates may be linked to each other. If it is determined that the two PDCCH candidates cannot be configured, the control unit 210 may determine whether one or more PDCCH candidates can be configured among the plurality of PDCCH candidates.

[0231] The one or more PDCCH candidates may be two PDCCH candidates associated with one search space set (third embodiment), or one PDCCH candidate (fourth embodiment).

[0232] The two PDCCH candidates may be associated with two control resource sets, respectively.

[0233] The two PDCCH candidates may be two repetitions.

[0234] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0235] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission may be called a transmitting unit, a transmitter, and the like. In either case, as described above, the method of realization is not particularly limited.

[0236] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 14 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0237] In this disclosure, the terms "apparatus," "circuit," "device," "section," "unit," and the like can be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0238] For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processes may be performed by one processor, or the processes may be performed by two or more processors simultaneously, sequentially, or in other manners. Also, the processor 1001 may be implemented by one or more chips.

[0239] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading a specific software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communications via a communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0240] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0241] Moreover, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to the programs. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks may be realized in a similar manner.

[0242] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be called a register, a cache, a main memory (primary storage device), and the like. The memory 1002 can store a program (program code), a software module, and the like that is executable to implement a wireless communication method according to an embodiment of the present disclosure.

[0243] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0244] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0245] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one (e.g., a touch panel).

[0246] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0247] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0248] (Modification) In addition, the terms explained in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be read as mutually interchangeable. A signal may also be a message. A reference signal may also be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applied standard. A component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, etc.

[0249] 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.

[0250] Here, the numerology may be a communication parameter applied to at least one of the transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0251] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may also be a time unit based on numerology.

[0252] A slot may include multiple minislots. Each minislot may be composed of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0253] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. A different name may be used for the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be read as interchangeable with each other.

[0254] For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0255] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0256] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0257] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0258] A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0259] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0260] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0261] In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0262] In addition, one or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0263] 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.

[0264] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0265] The BWP may include a UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0266] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0267] The above-mentioned structures of radio frames, subframes, slots, minislots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

[0268] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0269] The names used for parameters and the like in this disclosure are not limiting in any way. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0270] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0271] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via a plurality of network nodes.

[0272] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0273] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0274] The physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. The MAC signaling may be notified, for example, by using a MAC Control Element (CE).

[0275] 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).

[0276] The determination may be made based on a value represented by a single bit (0 or 1), a Boolean value represented as true or false, or by comparing numerical values ​​(e.g., with a predetermined value).

[0277] 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.

[0278] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0279] 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).

[0280] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," and the like may be used interchangeably.

[0281] In this disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0282] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services in this coverage.

[0283] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0284] 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.

[0285] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0286] Furthermore, the base station in the present disclosure may be read as a user terminal. For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, an uplink channel, a downlink channel, etc. may be read as a sidelink channel.

[0287] Similarly, the user terminal in the present disclosure may be interpreted as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0288] In the present disclosure, an operation performed by a base station may be performed by its upper node in some cases. It is clear that in a network including one or more network nodes having base stations, various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0289] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to implementation. In addition, the processing procedures, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be reordered unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0290] Each aspect / embodiment described in the present disclosure may be implemented using any of a wide variety of standards, including Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems using 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other appropriate wireless communication methods, next-generation systems that are based on these, etc. Also, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0291] 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."

[0292] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0293] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, and the like.

[0294] A "determining" may also be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.

[0295] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. That is, "determination" may be considered to be "deciding" to perform some action.

[0296] Additionally, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," etc.

[0297] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.

[0298] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0299] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, and the like, as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, and the like, as some non-limiting and non-exhaustive examples.

[0300] 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."

[0301] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0302] In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0303] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modified and altered forms without departing from the spirit and scope of the invention defined based on the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the invention according to the present disclosure.

Claims

1. A transmitter for reporting UE capabilities for decoding two linked physical downlink control channel (PDCCH) candidates among a plurality of PDCCH candidates; A control unit that determines whether the two PDCCH candidates can be configured based on the UE capability; A receiving unit that receives the two PDCCH candidates when it is determined that the two PDCCH candidates can be configured, The two PDCCH candidates are in the same slot, The two PDCCH candidates are associated with two search space sets, respectively; When it is determined that the two PDCCH candidates cannot be configured, the control unit determines whether one or more PDCCH candidates among the multiple PDCCH candidates can be configured based on the UE capability.

2. The terminal of claim 1 , wherein the two PDCCH candidates are associated with two control resource sets, respectively.

3. The terminal according to claim 1 or 2, wherein the two PDCCH candidates are two repetitions.

4. A wireless communication method for a terminal, comprising: reporting UE capability for decoding two linked physical downlink control channel (PDCCH) candidates among a plurality of PDCCH candidates; determining whether the two PDCCH candidates can be configured based on the UE capability; if it is determined that the two PDCCH candidates can be configured, receiving the two PDCCH candidates; The two PDCCH candidates are in the same slot, The two PDCCH candidates are associated with two search space sets, respectively; When it is determined that the two PDCCH candidates cannot be configured, the terminal determines, based on the UE capabilities, whether one or more PDCCH candidates among the multiple PDCCH candidates can be configured.

5. A receiving unit for receiving UE capabilities for decoding two mutually linked physical downlink control channel (PDCCH) candidates among a plurality of PDCCH candidates; A control unit that determines whether the two PDCCH candidates can be configured based on the UE capability; A transmitter that transmits a PDCCH in at least one of the two PDCCH candidates when it is determined that the two PDCCH candidates can be arranged, The two PDCCH candidates are in the same slot, The two PDCCH candidates are associated with two search space sets, respectively; When it is determined that the two PDCCH candidates cannot be configured, the control unit determines whether one or more PDCCH candidates among the multiple PDCCH candidates can be configured based on the UE capabilities.

6. A system having a terminal and a base station, The terminal includes a transmitter for reporting UE capabilities regarding decoding of two mutually linked physical downlink control channel (PDCCH) candidates among a plurality of PDCCH candidates; A control unit that determines whether the two PDCCH candidates can be configured based on the UE capability; A receiving unit that receives the two PDCCH candidates when it is determined that the two PDCCH candidates can be configured, The two PDCCH candidates are in the same slot, The two PDCCH candidates are associated with two search space sets, respectively; When it is determined that the two PDCCH candidates cannot be configured, the control unit determines whether one or more PDCCH candidates among the plurality of PDCCH candidates can be configured based on the UE capability; The base station includes a receiver for receiving the UE capabilities; A control unit that determines whether the two PDCCH candidates can be configured based on the UE capability; A transmitter that transmits a PDCCH in at least one of the two PDCCH candidates when it is determined that the two PDCCH candidates can be arranged, When it is determined that the two PDCCH candidates cannot be configured, the control unit determines whether or not the one or more PDCCH candidates among the multiple PDCCH candidates can be configured based on the UE capabilities.

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