Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure includes: a control unit for using, for radio link monitoring, one or more reference signals for an active transmission configuration indication (TCI) state associated with one or more first control resource sets (CORESETs) when a CORESET pool index of 0 is not set for the first CORESETs, a CORESET pool index other than 0 is set for the second CORESETs, and a radio link monitoring reference signal (RLM-RS) is not set; and a receiving unit for receiving the one or more reference signals. According to one embodiment of the present disclosure, a radio link can be appropriately monitored.

Description

Technical Field

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

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized to achieve even higher data rates and lower latency (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) has been standardized to further enhance the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Releases (Rel.) 8 and 9).

[0003] Successor systems to LTE (e.g., also known as the fifth generation mobile communication system (5G), 5G+ (plus), the sixth generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.) are also being studied.

[0004] Prior art literature

[0005] Non-patent literature

[0006] 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

[0007] Problems to be solved by the invention

[0008] In existing LTE systems (LTE Rel. 8-14), radio link quality is monitored (Radio Link Monitoring (RLM)). If a Radio Link Failure (RLF) is detected based on RLM, a request is made to the user equipment (UE) to re-establish a Radio Resource Control (RRC) connection.

[0009] Research is underway to utilize RLM in future wireless communication systems (e.g., NR). In NR, the base station can also use higher-layer signaling to configure a Radio Link Monitoring Reference Signal (RLM-RS) for each BWP for the UE.

[0010] If RLM-RS-related parameters are not provided, the UE may use the RS provided for the activated TCI state for PDCCH reception as the RLM-RS. Here, there is a case where the UE determines the RLM-RS based on the search space set with the shortest monitoring period.

[0011] However, if the UE is not provided with RLM-RS-related parameters, it may be unclear how the UE determines the parameters. If this operation is unclear, there is a concern that the base station and the UE may have inconsistent parameters, which may degrade RLM performance and communication throughput.

[0012] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately monitor a wireless link.

[0013] Means for solving problems

[0014] A terminal involved in one embodiment of the present disclosure includes: a control unit that uses one or more reference signals for activating a transmission configuration indication (TCI) state associated with one or more first control resource sets (CORESETs) in radio link monitoring when a CORESET pool index of 0 is not set for one or more first control resource sets (CORESETs) and a CORESET pool index of a value other than 0 is set for one or more second CORESETs, and no radio link monitoring reference signal (RLM-RS) is set; and a receiving unit that receives the one or more reference signals.

[0015] Effects of the Invention

[0016] According to one aspect of the present disclosure, a wireless link can be appropriately monitored. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a diagram showing an example of a multi-TRP scenario.

[0018] Figure 2 This is a diagram showing an example of RLM-RS determination according to the first embodiment.

[0019] Figure 3 This is a diagram showing another example of RLM-RS determination according to the first embodiment.

[0020] Figure 4 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0021] Figure 5 This is a diagram showing an example of the configuration of a base station according to one embodiment.

[0022] Figure 6 This is a diagram showing an example of the configuration of a user terminal according to an embodiment.

[0023] Figure 7 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to one embodiment. DETAILED DESCRIPTION

[0024] (Multiple TRP)

[0025] In NR, one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi TRP (MTRP)) using one or more panels (multi-panels) to perform DL transmissions to the UE are being studied. In addition, the UE is studying the use of one or more panels to perform UL transmissions to one or more TRPs.

[0026] In addition, 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] Figure 1 The following diagrams illustrate an example of a multi-TRP scenario. In these examples, it is assumed that each TRP and UE can utilize two different beams, but the present invention is not limited to this.

[0028] Multiple TRPs (TRP#1, #2) can also be connected via ideal / non-ideal backhaul to exchange information, data, etc. Different code words (CW) and different layers can also be sent from each TRP in the multiple TRPs. As a method of sending multiple TRPs, non-coherent joint transmission (NCJT) can also be used.

[0029] In NCJT, for example, TRP#1 performs modulation mapping and layer mapping on a first codeword, and uses a first precoding method to transmit a first PDSCH for a first number of layers (e.g., two layers). In addition, TRP#2 performs modulation mapping and layer mapping on a second codeword, and uses a second precoding method to transmit a second PDSCH for a second number of layers (e.g., two layers).

[0030] In addition, multiple PDSCHs (multi-PDSCHs) being NCJTed may also be defined to partially or completely overlap with respect to at least one of the time domain and the frequency domain. That is, at least one of the time and frequency resources of the first PDSCH from the first TRP and the second PDSCH from the second TRP may also overlap.

[0031] It is also conceivable that the first PDSCH and the second PDSCH are not in a quasi-co-location (QCL) relationship (not quasi-co-located). Reception of multiple PDSCHs can also be replaced by simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0032] Multiple PDSCHs from multiple TRPs (also referred to as multiple PDSCHs) can also be scheduled using one DCI (single DCI, single PDCCH) (single-master mode). Multiple PDSCHs from multiple TRPs can also be scheduled separately using multiple DCIs (multiple DCIs, multiple PDCCHs) (multiple-master mode).

[0033] Based on such a multi-TRP scenario, more flexible transmission control using channels of good quality can be performed.

[0034] In order to support the transmission of multiple TRPs within a cell (intra-cell, with the same cell ID) and between cells (inter-cell, with different cell IDs) based on multiple PDCCHs, in the RRC setting information for linking multiple pairs of PDCCHs and PDSCHs with multiple TRPs, a control resource set (CORESET) in the PDCCH setting information (PDCCH-Config) can also correspond to one TRP.

[0035] In NR Rel.15, the maximum number of CORESETs per PDCCH setting information is 3. In multiple TRP operation based on multiple PDCCHs, the maximum number of CORESETs per PDCCH setting information or BWP can also be increased to 5 according to UE capabilities.

[0036] (TCI status of PDCCH)

[0037] The information related to the QCL between the PDCCH (or the DMRS antenna port associated with the PDCCH) and a certain RS can also be called the TCI state for the PDCCH, etc.

[0038] The UE may also determine the TCI state for a UE-specific PDCCH (CORESET) based on higher layer signaling. For example, one or more (K) TCI states (lists) may be configured for each CORESET for the UE via RRC signaling.

[0039] The UE can also be activated via a MAC CE: one of multiple TCI states configured for each CORESET via RRC signaling. This MAC CE is also called a TCI State Indication for UE-specific PDCCH MAC CE. The UE can also monitor the CORESET based on the activated TCI state corresponding to the CORESET.

[0040] (RLM)

[0041] In NR, Radio Link Monitoring (RLM) is also used.

[0042] In NR, the base station can also use higher layer signaling to configure the Radio Link Monitoring Reference Signal (RLM-RS) for each BWP for the UE. The UE can also receive the configuration information for RLM (for example, the "RadioLinkMonitoringConfig" information element of RRC).

[0043] The RLM configuration information may include failure detection resource configuration information (e.g., "failureDetectionResourcesToAddModList" in a higher layer parameter). The failure detection resource configuration information may include parameters related to RLM-RS (e.g., "RadioLinkMonitoringRS" in a higher layer parameter).

[0044] Parameters related to RLM-RS may also include information indicating the purpose of RLM, an index corresponding to the RLM-RS resource (for example, an index included in the "failureDetectionResources" parameter of a higher layer), etc. This index may be, for example, an index of a CSI-RS resource configuration (for example, a non-zero power CSI-RS resource ID) or an SS / PBCH block index (SSB index).

[0045] The UE may also determine the RLM-RS resource (RLM-RS selection operation, RLM-RS decision rule) based on the index corresponding to the RLM-RS resource, and implement RLM using the RLM-RS resource.

[0046] If the UE is not provided with a Radio Link Monitoring RS (RLM-RS), and the UE is provided with a TCI state including one or more CSI-RS for PDCCH reception, the UE may also follow the following procedure.

[0047] If the activated TCI state for PDCCH reception includes only one RS, the UE uses the RS provided for the TCI state for the activated TCI state for PDCCH reception for RLM.

[0048] If the activated TCI state for PDCCH reception includes two RSs, the UE expects that one RS has QCL type D and uses the RS with QCL type D for RLM. The UE does not expect that both RSs have QCL type D.

[0049] • The UE does not need to use aperiodic or semi-persistent RS for RLM.

[0050] ·For L max (Maximum number of SS / PBCH block candidates per half-frame) = 4. The UE follows the order of the search space sets from the shortest monitoring period and selects N active TCI states provided for PDCCH reception in the CORESET associated with the search space set. RLM RS. If more than one CORESET is associated with a search space set with the same monitoring period, the UE determines the order of the CORESETs from the highest CORESET. The UE may also follow the order of the CORESETs to select N RLM RS.

[0051] In the case that the UE is not provided with RadioLinkMonitoringRS, the UE may not assume that more than N RLM A RadioLinkMonitoringRS is used for RLM.

[0052] In L max =4, it can also be N RLM =2. In L max =8, it can also be N RLM =4. In L max =64, it can also be N RLM =8.

[0053] If the UE is not provided with the reference signal (RS) information for RLM (e.g., Radiolink Monitoring RS), the UE determines the RLM-RS based on the TCI state for PDCCH. The number of RLM-RS should be N RLM the following.

[0054] In Rel. 16, a maximum of five CORESETs are configured for multi-TRP transmission based on multiple PDCCHs (multi-DCIs), and a CORESET pool index (CORESETPoolIndex) is configured for each CORESET.

[0055] When the UE is not provided with information on the RLM RS (when the UE is not explicitly notified of information on the RLM RS), the following questions 1 and 2 may be considered regarding how the UE determines the RLM-RS.

[0056] <Question 1>

[0057] NR Rel.15 only stipulates N RLM When the value is 2 and the maximum number of CORESETs is 3, for L max RLM-RS decision (narrowing) rule (UE operation) for the case where the maximum number of CORESETs is 5. max =4 and N RLM =2 and L max =8 and N RLM The RLM-RS determination rule for the case where =4 is not clear.

[0058] Question 2

[0059] In NR Rel.15, the UE determines the CORESET with the TCI state used for RLM-RS based on the following two factors.

[0060] Monitoring period of the search space associated with CORESET (in order from the shortest monitoring period)

[0061] CORESET ID (If there are more than one CORESET corresponding to the same monitoring period, the CORESET IDs are listed in order from the highest one)

[0062] However, information related to the TRP is not considered in RLM-RS determination. Regarding the RLM-RS determined by the UE based on the rules of NR Rel.15, when it corresponds to only one TRP, it is considered that it is randomly selected from two TRPs. This is sometimes inappropriate for multiple PDSCH transmissions based on multiple PDCCHs in a multi-TRP scenario.

[0063] Furthermore, it is possible that the CORESET pool index is not set for some CORESETs. For example, the CORESET pool index is not set for CORESET #1 and #2, but the CORESET pool index of 1 is set for CORESET #3. In this case, it is unclear which CORESET is being used.

[0064] If the method for determining RLM-RS is unclear, RLM may not be performed appropriately, which may degrade system performance.

[0065] Therefore, the inventors of the present invention have conceived a method for determining the RLM-RS when the UE is not provided with the RLM-RS (when the UE is not explicitly configured with the RLM-RS through RRC signaling).

[0066] In the present disclosure, “A / B” and “at least one of A and B” may be used interchangeably.

[0067] In the present disclosure, panel, uplink (Uplink (UL)) transmitting entity, TRP, spatial relationship, control resource set (COntrol REsource SET (CORESET)), PDSCH, codeword, base station, antenna port of a certain signal (for example, demodulation reference signal (DeModulation Reference Signal (DMRS)) port), antenna port group of a certain signal (for example, DMRS port group), group for multiplexing (for example, code division multiplexing (Code Division Multiplexing (CDM)) group, reference signal group, CORESET group), CORESET pool, CW, redundancy version (RV)), layer (MIMO layer, transmission layer, spatial layer) can also be replaced with each other. In addition, panel identifier (Identifier (ID)) and panel can also be replaced with each other. In the present disclosure, TRP ID and TRP can also be replaced with each other.

[0068] In the present disclosure, index, ID, indicator, resource ID, etc. can also be replaced with each other.

[0069] In the present disclosure, cell, CC, carrier, BWP, activated DL BWP, activated UL BWP, and band may also be used interchangeably. In the present disclosure, RRC parameters, higher layer parameters, RRC information elements (IEs), and RRC messages may also be used interchangeably.

[0070] In the present disclosure, lowest, highest, smallest, and largest can also be replaced with each other. In the present disclosure, shortest, longest, smallest, and largest can also be replaced with each other.

[0071] In the present disclosure, the terms beam, TCI state, QCL assumption, QCL parameter, spatial domain receive filter, UE spatial domain receive filter, UE receive beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS of QCL type D according to TCI state or QCL assumption, and RS of QCL type A according to TCI state or QCL assumption may also be used interchangeably. In the present disclosure, the terms QCL type X-RS, DL-RS associated with QCL type X, DL-RS having QCL type X, DL-RS source, SSB, and CSI-RS may also be used interchangeably.

[0072] (Wireless Communication Method)

[0073] In the present disclosure, a UE with multiple TRPs set can also determine at least one of the TRPs corresponding to the DCI, the TRP corresponding to the PDSCH or UL transmission (PUCCH, PUSCH, SRS, etc.) scheduled by the DCI, etc. based on at least one of the following.

[0074] The value of a specific field included in the DCI (e.g., a field specifying the TRP, an antenna port field, a PRI).

[0075] DMRS corresponding to the scheduled PDSCH / PUSCH (e.g., the DMRS sequence, resources, CDM group, DMRS port, DMRS port group, antenna port group, etc.).

[0076] DMRS corresponding to the PDCCH on which DCI is transmitted (for example, the DMRS sequence, resources, CDM group, DMRS port, DMRS port group, etc.).

[0077] The CORESET that received the DCI (e.g., the CORESET pool ID of the CORESET, the ID of the CORESET, the scrambling ID (which may also be replaced by a sequence ID), resources, etc.).

[0078] RS (RS related groups, etc.) used for TCI status, QCL assumptions, spatial relationship information, etc.

[0079] In the present disclosure, a single PDCCH (DCI) may also be referred to as a PDCCH (DCI) of a first scheduling type (e.g., scheduling type A (or type 1)). In addition, a multiple PDCCH (DCI) may also be referred to as a PDCCH (DCI) of a second scheduling type (e.g., scheduling type B (or type 2)).

[0080] In the present disclosure, it is also conceivable that a single PDCCH is supported when multiple TRPs utilize an ideal backhaul. It is also conceivable that multiple PDCCHs are supported when multiple TRPs utilize a non-ideal backhaul.

[0081] In addition, the ideal backhaul may also be referred to as DMRS port group type 1, reference signal association group type 1, antenna port group type 1, CORESET pool type 1, etc. The non-ideal backhaul may also be referred to as DMRS port group type 2, reference signal association group type 2, antenna port group type 2, CORESET pool type 2, etc. The names are not limited to these.

[0082] <Implementation Method 1>

[0083] The RLM-RS determination method (RLM-RS selection operation, RLM-RS determination rule) when the UE is not provided with RLM-RS may also differ according to the setting of the CORESET pool index.

[0084] For RLM-RS, the UE may also follow the following procedures 1 and 2.

[0085] [Process 1]

[0086] If the UE is not provided with Radio Link Monitoring RS (RLM-RS) and the UE is provided with a TCI state including more than one CSI-RS for PDCCH reception, the UE may also follow the following procedures 1-1 to 1-4.

[0087] [[Process 1-1]]

[0088] If the activated TCI state for PDCCH reception includes only one RS, the UE uses the RS provided for the TCI state of the activated TCI state for PDCCH reception for RLM.

[0089] [[Process 1-2]]

[0090] If the activated TCI state for PDCCH reception includes two RSs, the UE expects that one RS has QCL type D and uses the RS with QCL type D for RLM. The UE does not expect that both RSs have QCL type D.

[0091] [[Process 1-3]]

[0092] The UE does not need to use aperiodic or semi-persistent RS for RLM.

[0093] [[Process 1-4]]

[0094] For L max (Maximum number of SS / PBCH block candidates per half-frame) = 4. The UE follows the order of the search space sets from the shortest monitoring period (in ascending order of monitoring period) and selects N blocks provided for the activated TCI state for PDCCH reception in the CORESET associated with the search space set. RLMRS. If more than one CORESET is associated with a search space set with the same monitoring period, the UE determines the order of the CORESETs from the highest CORESET index (in descending order of CORESET index). The UE may also follow the order of the CORESETs to select N RLM RS.

[0095] [Process 2]

[0096] If the UE that satisfies the following conditions 2-1 and 2-2 is not provided with RLM-RS information (RadioLinkMonitoringRS) and the UE is provided with a TCI state including one or more CSI-RSs for PDCCH reception, the UE may also follow the following procedures 2-1 to 2-4.

[0097] [[Condition 2-1]]

[0098] The UE is not provided with a CORESET pool index (CORESETPoolIndex) for the (one or more) first CORESETs on the (one or more) active DL BWPs of the (one or more) serving cells, or the UE is provided with a CORESET pool index having a value of 0 for the (one or more) first CORESETs on the active DL BWPs of the serving cells.

[0099] [[Condition 2-2]]

[0100] The UE is provided with a CORESET pool index having a value of 1 for the second CORESET(s) on the activated DL BWP(s) of the serving cell(s).

[0101] [[Process 2-1]]

[0102] If the activated TCI state for PDCCH reception includes only one RS, the UE uses the RS provided with the TCI state for the activated TCI state for PDCCH reception in the first CORESET for RLM.

[0103] [[Process 2-2]]

[0104] If the activated TCI state for PDCCH reception in the first CORESET includes two RSs, the UE assumes that one RS has QCL type D and uses the RS with QCL type D for RLM. The UE does not assume that both RSs have QCL type D.

[0105] [[Process 2-3]]

[0106] The UE does not need to use aperiodic or semi-persistent RS for RLM.

[0107] [[Process 2-4]]

[0108] For L max = 4, the UE follows the order of the search space sets from the shortest monitoring period and selects the N active TCI state provided for PDCCH reception in the CORESET associated with the search space set as the first CORESET. RLM RS. If more than one CORESET within the first CORESET is associated with a search space set with the same monitoring period, the UE determines the order of the CORESETs from the highest CORESET. The UE may also follow the order of the CORESETs to select N RLM RS.

[0109] The CORESET pool index set for the second CORESET may not be 1, may be a number other than 0, or may be greater than 1.

[0110] A CORESET pool index for at least one of the first CORESET and the second CORESET may also be provided through PDCCH configuration information.

[0111] In the present disclosure, PDCCH configuration information (PDCCH-Config) and CORESET list (controlResourceSetToAddModList) may also be used interchangeably.

[0112] exist Figure 2 In the example, CORESET pool 0 (the first CORESET) with a CORESET pool index of 0 corresponds to TRP0 and includes CORESETs 0, 1, and 2. CORESET pool 1 with a CORESET pool index of 1 corresponds to TRP1 and includes CORESETs 3 and 4. The monitoring periods of the search space sets associated with CORESETs 0, 1, 2, 3, and 4 are 10, 20, 20, 10, and 40 ms, respectively. The activated TCI states of the PDCCHs in CORESETs 0, 1, 2, 3, and 4 are TCI states 2, 1, 3, 4, and 5, respectively.

[0113] In this example, L max =4, N RLM =2.

[0114] Since CORESET pool 0 (the first CORESET) has the lowest CORESET pool index, the UE selects TCI state 2 for PDCCH in CORESET 0 that is associated with the search space set with the shortest monitoring period of 10ms among the CORESETs in CORESET pool 0 (the first CORESET). Since CORESETs 1 and 2 in CORESET pool 0 (the first CORESET) are associated with the same search space set with a monitoring period of 20ms, the UE selects TCI state 3 for PDCCH in CORESET 2 in the order from the highest CORESET index. Through this process, the UE determines the RSs of the selected TCI states 2 and 3 as N RLM Two RLM-RS.

[0115] exist Figure 3 In the example, the first CORESET that has not been set to the CORESET pool index includes CORESET0, 1, and 2. Other settings and processes are the same as Figure 2 same.

[0116] According to the above embodiment 1, the UE can appropriately select RLM-RS even when the CORESET pool index is set. In addition, the UE can appropriately select RLM-RS even when the CORESET pool index is not set, thereby ensuring compatibility with Rel.15.

[0117] [Variations of the First and Second Coresets]

[0118] In the above-mentioned embodiments, the first CORESET corresponds to a CORESET that is not provided with a CORESET pool index or is provided with a CORESET pool index value = 0, and the second CORESET corresponds to a CORESET that is provided with a CORESET pool index value = 1, but the present invention is not limited thereto.

[0119] For example, the first CORESET may be replaced with a CORESET to which a CORESET pool index is not provided, and the second CORESET may be replaced with a CORESET to which a CORESET pool index value = 1 is provided.

[0120] For example, the first CORESET may be replaced by a CORESET that is not provided with a CORESET pool index, and the second CORESET may be replaced by a CORESET that is provided with a CORESET pool index (the value may be any value).

[0121] In addition, in the present disclosure, the second CORESET and the final CORESET can also be replaced with each other.

[0122] In addition, in the present disclosure, “if the UE is not providedCORESETPoolIndex or is provided CORESETPoolIndex with value 0 for one or morefirst CORESETs and is provided CORESETPoolIndex with value 1 for one or moresecond CORESETs on an active DL BWP of a serving cell” is consistent with “if the UE is not provided CORESETPoolIndex or is provided CORESETPoolIndex with value 0 for one or morefirst CORESETs and is provided CORESETPoolIndex with value 1 for one or moresecond CORESETs on an active DL BWP of a serving cell”. more first CORESETs on an active DL BWP of a serving cell, and is provided CORESETPoolIndex with value1for one or more second CORESETs on an active DL BWP of a serving cell") can also be replaced with each other.

[0123] In addition, in the present disclosure, serving cell and one or more serving cells (serving cells) may be interchangeable. In addition, in the present disclosure, activated DL BWP and one or more activated DL BWPs (active DL BWPs) may be interchangeable. In addition, in the present disclosure, the "activated DL BWP of a certain serving cell" to which the first CORESET belongs (or is associated) and the "activated DL BWP of a certain serving cell" to which the second CORESET belongs (or is associated) may be the same or different.

[0124] <Other Implementation Methods>

[0125] The UE may also report UE capability information (UE capability) to the network including information related to at least one of the following:

[0126] Whether the RLM-RS selection operation of at least one of the aforementioned embodiments is supported.

[0127] The number of RLM-RSs supported by the RLM-RS selection operation (maximum number) The number of RLM-RSs may also be at least one of the number per BWP, the number per CC, the number per band, and the number per UE.

[0128] The maximum number of CORESET pool indexes supported by the RLM-RS selection operation. The CORESET pool index number may also be at least one of the number per BWP, the number per CC, the number per band, and the number per UE.

[0129] The maximum number of core sets supported by the RLM-RS selection operation. The core set number may also be at least one of the number per BWP, the number per CC, the number per band, and the number per UE.

[0130] Whether simultaneous reception of multiple DCIs (multi-DCI, multi-PDCCH) is supported (e.g., whether detection of two or more DCI formats of multiple PDCCHs whose first symbols are received in the same symbol in the same slot is allowed).

[0131] Whether to support simultaneous reception of multiple DCIs that are not of a specific QCL relationship (e.g., not QCL type D).

[0132] Whether NCJT of PDSCH is supported (in other words, simultaneous reception of multiple PDSCHs (codewords) that are not of a specific QCL relationship (eg, not QCL type D)).

[0133] Whether single DCI is supported.

[0134] Whether multiple DCIs are supported.

[0135] • The number of DCIs that the UE can detect (or decode) during a specific PDCCH monitoring period or in the same symbol (eg, OFDM symbol).

[0136] • The number of DCIs that are not of a specific QCL relation (eg, not QCL type D) that the UE is able to detect (or decode) during a specific PDCCH monitoring period or in the same symbol (eg, OFDM symbol).

[0137] • The number of PDSCHs (or codewords) that a UE can detect (or decode) in the same symbol (eg, OFDM symbol).

[0138] • The number of PDSCHs (or codewords) that are not of a specific QCL relation (eg, not QCL type D) that the UE can detect (or decode) in the same symbol (eg, OFDM symbol).

[0139] • The number, or maximum number, of RLM-RSs selected by the UE if no RLM-RSs are provided.

[0140] The UE may also be configured to apply (or be configured to apply) at least one of the above-mentioned embodiments when reporting at least one of the above-mentioned UE capabilities. The network may also notify the UE that has reported at least one of the above-mentioned UE capabilities of information for activating an operation based on at least one of the above-mentioned embodiments.

[0141] The UE may also assume that it selects the RLM-RS using a value within the range of values (numbers) reported in the UE capability information.

[0142] In each of the above embodiments, at least any one of the following may also be applied.

[0143] The operations of each embodiment may be applied only in a specific frequency range (for example, outside of Frequency Range 2 (FR2) and FR1). Such operations can reduce the complexity of the UE.

[0144] The UE can also be assumed to have the RLM-RS number N RLM No more than the number of CORESETs.

[0145] In N RLM When the number of CORESETs exceeds N, UE can also replace N RLMThe number of activated TCI states (the number of TCI states activated by MACCE) is used to determine the RLM-RS with the largest number of activated TCI states. It is assumed that the number of activated TCI states is greater than the number of CORESETs.

[0146] The UE may also use different RLM-RS determination rules between the case of using a single TRP and the case of using multiple TRPs.

[0147] The UE may also change the RLM-RS determination rule based on at least one of RRC signaling, MAC CE, and DCI. For example, the RLM-RS determination rule may be different between the case where at least one of the following conditions is met: receiving DCI scheduling PDSCH, receiving PDSCHs from multiple TRPs simultaneously, and the case where the UE has a TCI state for each TRP, and the case where these conditions are not met.

[0148] (Wireless Communication System)

[0149] The following describes a configuration of a wireless communication system according to an embodiment of the present disclosure. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above-described embodiments of the present disclosure or a combination thereof.

[0150] Figure 4 This figure shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), or the like.

[0151] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also 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 (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0152] 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.

[0153] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0154] The wireless communication system 1 may also include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) that are deployed within the macrocell C1 and form small cells C2 that are narrower than the macrocell C1. User terminals 20 may also be located within at least one of the cells. The configuration and number of cells and user terminals 20 are not limited to those shown in the figure. Hereinafter, when not distinguishing between base stations 11 and 12, they are collectively referred to as base stations 10.

[0155] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0156] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also be equivalent to a frequency band higher than FR2.

[0157] Furthermore, in each CC, the user terminal 20 may communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0158] Multiple base stations 10 can also be connected by wired (for example, optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (for example, NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 equivalent to the upper station can also be called an integrated access backhaul (IAB) donor, and the base station 12 equivalent to the relay station (relay) can also be called an IAB node.

[0159] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0160] The user terminal 20 may also be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0161] In the wireless communication system 1, a radio access scheme based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), or single carrier frequency division multiple access (SC-FDMA) may be used.

[0162] The radio access scheme may also be referred to as a waveform. In addition, 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.

[0163] As downlink channels, the wireless communication system 1 may use 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.

[0164] In addition, as uplink channels, the wireless communication system 1 can also use 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.

[0165] User data, higher-layer control information, and system information blocks (SIBs) are transmitted via the PDSCH. User data, higher-layer control information, and the like can also be transmitted via the PUSCH. Furthermore, the Master Information Block (MIB) can also be transmitted via the PBCH.

[0166] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information for at least one of the PDSCH and the PUSCH.

[0167] In addition, the DCI that schedules the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI that schedules the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be replaced by DL data, and the PUSCH may also be replaced by UL data.

[0168] In PDCCH detection, a control resource set (CORESET) and a search space can also be used. A CORESET corresponds to the resources for searching for DCI. A search space corresponds to the search area and search method for PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space settings.

[0169] A search space may also correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in this disclosure may be used interchangeably.

[0170] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also known as hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) can also be transmitted via the PUCCH. The random access preamble used to establish a connection with a cell can also be transmitted via the PRACH.

[0171] In the present disclosure, downlink, uplink, etc. may be expressed without the word "link." Furthermore, various channels may be expressed without the word "physical" at the beginning.

[0172] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. can also be transmitted. As DL-RS, in the wireless communication system 1, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. can also be transmitted.

[0173] For example, a synchronization signal may be at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block containing SSs (PSS, SSS) and PBCHs (and DMRS for PBCHs) may also be referred to as an SS / PBCH block or an SS block (SSB). Furthermore, SSs and SSBs may also be referred to as reference signals.

[0174] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0175] (Base Station)

[0176] Figure 5 This figure shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface (transmission line interface) 140. Furthermore, more than one of each of the control unit 110, the transmitting / receiving unit 120, the transmitting / receiving antenna 130, and the transmission path interface 140 may be provided.

[0177] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0178] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which this disclosure relates.

[0179] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. It may also control transmission and reception, measurement, etc., using the transmission and reception unit 120, the transmission and reception antennas 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting up, releasing, etc.) of communication channels, manage the status of the base station 10, manage radio resources, etc.

[0180] The transceiver unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may include a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transceiver circuit, and the like, which are described based on common knowledge in the technical fields involved in this disclosure.

[0181] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0182] The transmitting and receiving antenna 130 can be formed of an antenna described based on common knowledge in the technical field to which this disclosure relates, such as an array antenna.

[0183] The transmitting and receiving unit 120 may also transmit the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the aforementioned uplink channel, uplink reference signal, etc.

[0184] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmit beam and a receive beam.

[0185] The sending and receiving unit 120 (sending processing unit 1211) can also perform processing on the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (for example, RLC retransmission control), the Medium Access Control (MAC) layer (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0186] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (DFT) processing (as needed), inverse fast Fourier transform (IFFT) processing), precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0187] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0188] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, and demodulation into a baseband signal on the radio frequency band signal received by the transmitting and receiving antenna 130 .

[0189] The transmitting and receiving unit 120 (receiving processing unit 1212) can also apply receiving processing such as analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0190] The transmitting and receiving unit 120 (measuring unit 123) may also perform measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also 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 also be output to the control unit 110.

[0191] The transmission path interface 140 can also send and receive signals (return signaling) between the devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0192] In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 120 , the transmitting and receiving antenna 130 , and the transmission path interface 140 .

[0193] When a CORESET pool index of 0 is not set for one or more first control resource sets (CORESETs), a CORESET pool index other than 0 is set for one or more second CORESETs, and a radio link monitoring reference signal (RLM-RS) is not set, the control unit 110 may use one or more reference signals for an active transmission configuration indication (TCI) state associated with the first CORESET for radio link monitoring. The transmitting and receiving unit 120 may also transmit the one or more reference signals.

[0194] (User Terminal)

[0195] Figure 6This figure shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Furthermore, more than one of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0196] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is also assumed that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0197] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which this disclosure relates.

[0198] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission, reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals and forward them to the transmission and reception unit 220.

[0199] The transceiver unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may include a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, and the like, which are described based on common knowledge in the technical fields involved in this disclosure.

[0200] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit or may be composed of a transmitting unit and a receiving unit. The transmitting unit may also be composed of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0201] The transmitting and receiving antenna 230 can be formed of an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0202] The transmitting and receiving unit 220 may also receive the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the aforementioned uplink channel, uplink reference signal, etc.

[0203] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0204] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0205] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0206] In addition, whether or not to apply DFT processing may also be based on the transform precoding setting. For a certain channel (e.g., PUSCH), if transform precoding is valid (enabled), the transmitting / receiving unit 220 (transmitting processing unit 2211) may perform DFT processing as the aforementioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting / receiving unit 220 (transmitting processing unit 2211) may perform DFT processing as the aforementioned transmission processing without performing DFT processing.

[0207] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0208] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may also perform amplification, filter processing, and demodulation into a baseband signal on the radio frequency band signal received by the transmitting and receiving antenna 230 .

[0209] The transmitting and receiving unit 220 (receiving processing unit 2212) can also apply receiving processing such as analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0210] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to received signals. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signals. The measuring unit 223 may also 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 also be output to the control unit 210.

[0211] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 , the transmitting and receiving antenna 230 , and the transmission path interface 240 .

[0212] In addition, when a CORESET pool index of 0 is not set for one or more first control resource sets (CORESETs), a CORESET pool index other than 0 is set for one or more second CORESETs, and a radio link monitoring reference signal (RLM-RS) is not set, the control unit 210 may use one or more reference signals for the activation transmission configuration indication (TCI) state associated with the first CORESET in radio link monitoring (processes 1 and 2). The transmitting and receiving unit 220 may also receive the one or more reference signals.

[0213] When the maximum number of candidates for the synchronization signal block per half frame is 4, the control unit 210 may also select one or more reference signals from the first CORESET in the order of the corresponding search space set starting from the lowest monitoring period (process 4).

[0214] In the case where the first CORESET is more than one CORESET and is associated with a search space set having the same monitoring period, the control unit 210 may also select the more than one reference signals from the first CORESET in the order derived from the highest CORESET index (process 4).

[0215] The CORESET pool index set in the second CORESET may also be 1.

[0216] (Hardware Structure)

[0217] In addition, the block diagrams used in the description of the above embodiments show blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly connected (for example, by wired, wireless, etc.) and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0218] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, resolving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any of them are as described above, and the implementation method is not particularly limited.

[0219] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 7 This figure shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. The base station 10 and user terminal 20 described above can also 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, and the like.

[0220] In addition, in this disclosure, the terms such as device, circuit, equipment, section, and unit are interchangeable. The hardware structure of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0221] For example, although only one processor 1001 is shown, multiple processors may be provided. Furthermore, processing may be performed by a single processor, or by two or more processors simultaneously, sequentially, or using other methods. Furthermore, processor 1001 may be implemented using more than one chip.

[0222] Regarding the various functions in the base station 10 and the user terminal 20, for example, they are achieved by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0223] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, a computing device, registers, etc. For example, at least a portion of the control unit 110 (210) and the transmitting and receiving unit 120 (220) described above may also be implemented by the processor 1001.

[0224] In addition, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and performs various processes based on them. As a program, a program that causes a computer to perform at least a portion of the operations described in the above embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks can also be implemented similarly.

[0225] The memory 1002 may also be a computer-readable recording medium, for example, comprised of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 may store executable programs (program code), software modules, etc., for implementing the wireless communication method according to an embodiment of the present disclosure.

[0226] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), etc.), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, or a key drive), a magnetic stripe, a database, a server, or other suitable storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0227] The communication device 1004 is hardware (a transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. To implement at least one of frequency division duplex (FDD) and time division duplex (TDD), the communication device 1004 may also include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like. For example, the aforementioned transmitting and receiving unit 120 (220), transmitting and receiving antenna 130 (230), and the like may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be implemented by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0228] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to the outside (e.g., a display, speaker, light emitting diode (LED) lamp, etc.). Alternatively, the input device 1005 and the output device 1006 may be integrated (e.g., a touch panel).

[0229] Furthermore, the processor 1001, memory 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0230] Furthermore, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and may use such hardware to implement part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware components.

[0231] (Variation)

[0232] In addition, the terms described in this disclosure and the terms required for understanding this disclosure may also be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, or may be referred to as a pilot, pilot signal, etc. depending on the applied standard. In addition, a component carrier (CC) may also be referred to as a cell, frequency carrier, carrier frequency, etc.

[0233] A radio frame can also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) that constitute a radio frame can also be called a subframe. Furthermore, a subframe can also be composed of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) that is independent of the parameter set (numerology).

[0234] Here, a parameter set may also refer to communication parameters applied to at least one of the transmission and reception of a signal or channel. For example, a parameter set may also represent at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, radio frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, and specific windowing processing performed by the transmitter and receiver in the time domain.

[0235] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0236] A time slot may also contain multiple mini-slots. Each mini-slot may also consist of one or more symbols in the time domain. Furthermore, a mini-slot may also be referred to as a sub-slot. A mini-slot may also consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.

[0237] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units used for signal transmission. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective equivalents. Furthermore, the terms frame, subframe, time slot, mini-time slot, and symbol may be used interchangeably in this disclosure.

[0238] For example, a subframe can be called a TTI, multiple consecutive subframes can be called a TTI, and a slot or a mini-slot can be called a TTI. That is, at least one of a subframe and a TTI can be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Furthermore, the unit representing a TTI can be called a slot, a mini-slot, or the like, rather than a subframe.

[0239] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communications. For example, in the LTE system, a base station schedules each user terminal by allocating radio resources (such as the frequency bandwidth and transmit power available to each user terminal) in TTI units. The definition of TTI is not limited to this.

[0240] The TTI may also be a unit of time for transmitting channel-coded data packets (transport blocks), code blocks, code words, etc., and may also be a unit of processing for scheduling, link adaptation, etc. Furthermore, when a TTI is given, the time interval (e.g., the number of symbols) to which the transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI.

[0241] In addition, when a time slot or a mini-time slot is called a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) can also be the minimum time unit for scheduling. In addition, the number of time slots (mini-time slots) that constitute the minimum time unit for scheduling can also be controlled.

[0242] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a subslot, a time slot, etc.

[0243] In addition, long TTI (for example, normal TTI, subframe, etc.) can also be replaced by TTI with a time length exceeding 1ms, and short TTI (for example, shortened TTI, etc.) can also be replaced by TTI with a TTI length smaller than long TTI and greater than 1ms.

[0244] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it may also include one or more consecutive subcarriers (subcarriers). The number of subcarriers included in an RB may be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0245] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks.

[0246] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0247] 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.

[0248] A Bandwidth Part (BWP) (also referred to as a fractional bandwidth) can also represent a subset of contiguous common resource blocks (RBs) used for a particular parameter set within a particular carrier. Common RBs can also be identified by their index relative to the common reference point of the carrier. PRBs can also be defined within a BWP and numbered within that BWP.

[0249] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured within one carrier.

[0250] At least one of the configured BWPs may be activated, and the UE may not assume that it will transmit or receive specific signals / channels outside of the activated BWP. In addition, the terms "cell," "carrier," and the like in this disclosure may be replaced with "BWP."

[0251] The above-mentioned structures of radio frames, subframes, slots, mini-slots, and symbols are merely examples. For example, various modifications may be made to the number of subframes in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots within a slot, the number of symbols and RBs within a slot or mini-slot, the number of subcarriers within an RB, the number of symbols within a TTI, the symbol length, and the cyclic prefix (CP) length.

[0252] Furthermore, the information and parameters described in this disclosure may be expressed as absolute values, relative values relative to a specific value, or other corresponding information. For example, wireless resources may be indicated by specific indexes.

[0253] The names used for parameters, etc. in this disclosure are not intended to be limiting in any respect. Furthermore, the mathematical formulas for these parameters may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not intended to be limiting in any respect.

[0254] Information, signals, and the like described in this disclosure may also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that may be referred to throughout the foregoing description may also be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0255] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0256] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or appended. Output information, signals, etc. may also be deleted. Input information, signals, etc. may also be sent to other devices.

[0257] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0258] In addition, physical layer signaling may also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as RRC message, for example, RRC Connection Setup message, RRC Connection Reconfiguration message, etc. In addition, MAC signaling may also be notified using MAC Control Element (CE), for example.

[0259] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0260] The determination can be made by a value represented by a bit (0 or 1), a true or false value (Boolean value) represented by true (true) or false (false), or by comparison of numerical values (for example, comparison with a specific value).

[0261] The term “software” or “firmware” shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, or the like.

[0262] Furthermore, software, instructions, information, and the like may also be transmitted and received via a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and a wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0263] The terms "system" and "network" used in this disclosure can be used interchangeably. "Network" may also refer to devices included in the network (eg, base stations).

[0264] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)" "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0265] In this disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP))", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" are used interchangeably. In some cases, a base station may be referred to as a macro cell, small cell, femto cell, or pico cell.

[0266] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of the base station can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entire coverage area of at least one of a base station and a base station subsystem that provides communication services within that coverage area.

[0267] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0268] 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, hand set, user agent, mobile client, client, or several other appropriate terms.

[0269] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Furthermore, at least one of the base station and the mobile station may also be a device mounted on a mobile object, a mobile object itself, etc. The mobile object may be a means of transportation (e.g., a vehicle, an aircraft, etc.), a mobile object that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Furthermore, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0270] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by communication between multiple user terminals (for example, which may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be configured such that the user terminal 20 has the functions of the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0271] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0272] In the present disclosure, actions are assumed to be performed by a base station, and sometimes, depending on the circumstances, by its upper node. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME)), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0273] The various methods / implementations described in this disclosure may be used individually or in combination, and may be switched between them during execution. Furthermore, the processing procedures, sequences, flow charts, and the like of the various methods / implementations described in this disclosure may be reversed as long as they do not conflict. For example, the methods described in this disclosure use an illustrative order to present elements of various steps, but are not limited to the specific order presented.

[0274] The various modes and embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER3G, 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 (Ultra Mobile Broadband), and other technologies. Broadband (UMB)), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB)), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems based on these. In addition, multiple systems can also be combined for application (for example, LTE or LTE-A, combination with 5G, etc.).

[0275] The phrase “based on” used in this disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on.”

[0276] Any reference to an element using the designations "first," "second," etc., as used in this disclosure, does not necessarily define the quantity or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, reference to a first and a second element does not imply that only two elements may be used or that the first element must in some way take precedence over the second element.

[0277] The term "determining" as used in this disclosure may encompass a variety of actions. For example, "determining" may also include judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), ascertaining, etc. as performing a "determination."

[0278] In addition, "judgment (decision)" can also be a situation where receiving (for example, receiving information), transmitting (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0279] Furthermore, "judgment (decision)" can also refer to situations where resolving, selecting, choosing, establishing, comparing, etc. can be considered as "judgment (decision)". In other words, "judgment (decision)" can also refer to situations where certain actions can be considered as "judgment (decision)".

[0280] In addition, “judgment (decision)” can also be replaced by “assuming (assuming)”, “expecting (expecting)”, “considering (considering)” and so on.

[0281] The "maximum transmit power" recorded in this disclosure may refer to the maximum value of the transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated UE maximum transmit power).

[0282] 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 the two elements being "connected" or "coupled." The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be replaced by "access."

[0283] In the present disclosure, when two elements are connected, it is possible to consider them being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0284] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other." Alternatively, the term may also mean "A and B are each different from C." Terms such as "separate" and "bound" may also be interpreted in the same manner as "different."

[0285] When the terms "include," "including," and variations thereof are used in this disclosure, these terms, like the term "comprising," have an inclusive meaning. Furthermore, the term "or" used in this disclosure does not mean an exclusive OR.

[0286] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure may also include a case where the noun following the article is in a plural form.

[0287] While the inventions disclosed herein have been described in detail above, it will be apparent to those skilled in the art that the inventions disclosed herein are not limited to the embodiments described herein. The inventions disclosed herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the claims. Therefore, the descriptions in this disclosure are for illustrative purposes only and are not intended to limit the inventions disclosed herein in any way.

Claims

1. A terminal comprising: a control unit that, when a CORESET pool index is not set for one or more first control resource sets (CORESETs) and a CORESET pool index is set to 1 for one or more second CORESETs, determines, based on the number of active transmission configuration indication (TCI) states associated with the first CORESET, a reference signal for the active TCI state as a reference signal for failure detection in ascending order of a monitoring period of a search space set, and, when the first CORESET is associated with a search space set having the same monitoring period, performs a determination operation on the reference signal for failure detection in descending order of the index of the first CORESET; and a receiving unit, receiving the reference signal for failure detection, The control unit performs the determination operation when communicating with multiple transmission and reception points TRP, and performs a determination operation of a reference signal for failure detection that is different from the determination operation when communicating with a single TRP.

2. A wireless communication method for a terminal, comprising: When a CORESET pool index is not set for one or more first control resource sets (CORESETs) and a CORESET pool index is set to 1 for one or more second CORESETs, a reference signal for the activated TCI state is determined as a reference signal for failure detection in ascending order of a monitoring period of a search space set based on the number of activated transmission configuration indication TCI states associated with the first CORESET, and when a search space set having the same monitoring period is associated with the first CORESET, a determination operation of determining the reference signal for failure detection is performed in descending order of the index of the first CORESET; and receiving a reference signal for failure detection, In the step of performing the decision operation, the decision operation is performed when communicating with multiple transmitting and receiving points TRP, and when communicating with a single TRP, a decision operation of a reference signal for failure detection that is different from the decision operation is performed.

3. A system having a terminal and a base station: The terminal has: a control unit that, when a CORESET pool index is not set for one or more first control resource sets (CORESETs) and a CORESET pool index is set to 1 for one or more second CORESETs, determines, based on the number of active transmission configuration indication (TCI) states associated with the first CORESET, a reference signal for the active TCI state as a reference signal for failure detection in ascending order of a monitoring period of a search space set, and, when the first CORESET is associated with a search space set having the same monitoring period, performs a determination operation on the reference signal for failure detection in descending order of the index of the first CORESET; and a receiving unit, receiving the reference signal for failure detection, The control unit performs the decision operation when communicating with multiple transmission and reception points TRP, and performs a decision operation of a reference signal for failure detection different from the decision operation when communicating with a single TRP. The base station has: The sending unit sends the reference signal for failure detection.

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