Terminal, wireless communication method and base station

Abstract

A terminal according to one embodiment of the present disclosure includes: a control unit, which uses one or more reference signals for an activation transmission configuration indication (TCI) state associated with a lowest CORESET pool index for radio link monitoring when two or more different control resource set (CORESET) pool indexes are set and a radio link monitoring reference signal (RLM-RS) is not set; and a receiving unit, which receives 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] In existing LTE systems (e.g., 3GPP Rel. 8-14), user equipment (UE) uses at least one of an UL data channel (e.g., a physical uplink shared channel (PUSCH)) and an UL control channel (e.g., a physical uplink control channel (PUCCH)) to transmit uplink control information (UCI).

[0005] In existing LTE systems (LTE Rel. 8-14), radio link quality is monitored (Radio Link Monitoring (RLM)). When a Radio Link Failure (RLF) is detected based on RLM, the user equipment (UE) requests re-establishment of a Radio Resource Control (RRC) connection.

[0006] Prior art literature

[0007] Non-patent literature

[0008] 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

[0009] Problems to be solved by the invention

[0010] The use of Radio Link Monitoring (RLM) is also being studied in future wireless communication systems (e.g., NR). In NR, the base station can also use higher-layer signaling to configure the Radio Link Monitoring Reference Signal (RLM-RS) for each BWP of the UE.

[0011] 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.

[0012] 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 may be a discrepancy between the base station and the UE regarding the parameters, which may lead to a decrease in RLM performance and communication throughput.

[0013] 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.

[0014] Means for solving problems

[0015] A terminal in one embodiment of the present invention includes: a control unit that uses one or more reference signals for an activation transmission configuration indication (TCI) state associated with a lowest CORESET pool index for radio link monitoring when two or more different control resource set (CORESET) pool indices are set and a radio link monitoring reference signal (RLM-RS) is not set; and a receiving unit that receives the one or more reference signals.

[0016] Effects of the Invention

[0017] According to one embodiment of the present disclosure, a wireless link can be appropriately monitored. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figures 1A to 1D This is a diagram showing an example of a multi-TRP scenario.

[0019] Figure 2 This is a diagram showing an example of RLM-RS determination according to the first embodiment.

[0020] Figure 3 This is a diagram showing an example of RLM-RS determination according to the third embodiment.

[0021] Figure 4 This is a diagram showing an example of RLM-RS determination according to the fourth embodiment.

[0022] Figure 5 This is a diagram showing an example of RLM-RS determination according to the fifth embodiment.

[0023] Figure 6 This is a diagram showing an example of a schematic configuration of a wireless communication system according to one embodiment.

[0024] Figure 7 This is a diagram showing an example of the configuration of a base station according to one embodiment.

[0025] Figure 8 This is a diagram showing an example of the configuration of a user terminal according to one embodiment.

[0026] Figure 9 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

[0027] (Multiple TRP)

[0028] In NR, one or more Transmission / Reception Points (TRPs) (multi-TRPs) are being studied using one or more panels (multi-panels) to perform DL transmissions to the UE. In addition, the UE is being studied to perform UL transmissions to one or more TRPs.

[0029] 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.

[0030] Figures 1A to 1D This is a diagram showing an example of a multi-TRP scenario. In these examples, it is assumed that each TRP can transmit four different beams, but this is not limited to this.

[0031] Figure 1A This example shows a situation where only one TRP (in this example, TRP1) among multiple TRPs transmits to the UE (also referred to as single mode, single TRP, etc.). In this case, TRP1 transmits both control signals (PDCCH) and data signals (PDSCH) to the UE.

[0032] Figure 1B This is an example of a situation where only one TRP (TRP1 in this example) among multiple TRPs sends a control signal to the UE, and the multiple TRPs send data signals (also called single-master mode). The UE receives each PDSCH sent from the multiple TRPs based on a downlink control information (Downlink Control Information (DCI)).

[0033] Figure 1C This section shows an example of a scenario (also called master-slave mode) in which each of multiple TRPs transmits a portion of a control signal to the UE, while the multiple TRPs transmit data signals. Alternatively, TRP1 transmits portion 1 of the control signal (DCI), while TRP2 transmits portion 2 of the control signal (DCI). Portion 2 of the control signal (DCI) may also depend on portion 1. Based on these portions of the DCI, the UE receives each PDSCH transmitted from the multiple TRPs.

[0034] Figure 1D This is an example of a scenario (also called multi-master mode) in which multiple TRPs, each of which sends a different control signal to the UE, transmit data signals. Alternatively, a first control signal (DCI) may be transmitted in TRP1, and a second control signal (DCI) may be transmitted in TRP2. The UE receives the PDSCHs transmitted from the multiple TRPs based on these DCIs.

[0035] exist Figure 1B In such a case, when one DCI is used to schedule multiple PDSCHs from multiple TRPs (also called multiple PDSCHs), the DCI can also be called a single DCI (single PDCCH). Figure 1D In such a case where multiple DCIs are used to schedule multiple PDSCHs from multiple TRPs respectively, these multiple DCIs can also be called multiple DCIs (multiple PDCCHs).

[0036] Based on such a multi-TRP scenario, more flexible transmission control using channels of good quality can be performed.

[0037] Different code words (CW) and different layers can also be transmitted from each TRP of the multi-TRP. As one method of multi-TRP transmission, non-coherent joint transmission (NCJT) is being studied.

[0038] In NCJT, for example, TRP1 performs modulation mapping on the first codeword and layer mapping to transmit the first PDSCH using the first precoding for the first number of layers (e.g., 2 layers). Furthermore, TRP2 performs modulation mapping on the second codeword and layer mapping to transmit the second PDSCH using the second precoding for the second number of layers (e.g., 2 layers).

[0039] In addition, multiple PDSCHs (multi-PDSCHs) subjected to NCJT 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.

[0040] It is also possible to assume 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 QCL type D.

[0041] As in the multi-master mode, 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 used to link multiple PDCCH / PDSCH pairs with multiple TRPs, a control resource set (CORESET) in the PDCCH setting information (PDCCH-Config) can also correspond to one TRP.

[0042] In NR Rel.15, the maximum number of CORESETs for each PDCCH configuration information is 3. In multiple TRP operations based on multiple PDCCHs, the maximum number of CORESETs for each PDCCH configuration information or each BWP can also be increased to 5 according to UE capabilities.

[0043] (TCI, QCL)

[0044] In NR, research is being conducted on controlling the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and coding) of at least one of a signal and a channel (expressed as signal / channel) in the UE based on the transmission configuration indication state (TCI state).

[0045] The TCI state may also represent elements applied to downlink signals / channels. Elements corresponding to the TCI state used for uplink signals / channels may also be expressed as spatial relations.

[0046] The so-called TCI status refers to information related to Quasi-Co-Location (QCL) of signals / channels, and can also be called spatial reception parameters, spatial relationship information, etc. The TCI status can also be set for each channel or each signal for the UE.

[0047] QCL refers to an indicator that indicates the statistical properties of a signal / channel. For example, when a signal / channel is in a QCL relationship with another signal / channel, it can also indicate that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameters (e.g., spatial Rx parameters) can be assumed to be the same for these different signals / channels (at least one of these is QCL).

[0048] In addition, the spatial reception parameter may also correspond to the UE's receive beam (e.g., receive analog beam), or the beam may be determined based on spatial QCL. The QCL (or at least one element of QCL) in this disclosure may also be replaced with sQCL (spatial QCL).

[0049] Multiple types (QCL types) may be specified for QCLs. For example, the following four QCL types AD may be provided: In these four QCL types, parameters (or parameter sets) that can be assumed to be the same are different. These parameters (also referred to as QCL parameters) are represented below:

[0050] QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread;

[0051] QCL type B (QCL-B): Doppler shift and Doppler spread;

[0052] QCL type C (QCL-C): Doppler shift and average delay;

[0053] QCL type D (QCL-D): spatial reception parameters.

[0054] The UE assumes that a certain Control Resource Set (CORESET), channel or reference signal is in a specific QCL (e.g., QCL type D) relationship with other CORESETs, channels or reference signals, which can also be called QCL assumption.

[0055] The UE may also determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of the signal / channel based on the TCI status or QCL assumption of the signal / channel.

[0056] The TCI status may also include, for example, information about the QCL of the target channel (in other words, the reference signal (RS) used for the channel) and other signals (e.g., other RSs). The TCI status may also be set (indicated) via higher layer signaling, physical layer signaling, or a combination thereof.

[0057] In the present disclosure, the higher layer signaling may also be, for example, one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0058] MAC signaling may also use, for example, MAC control elements (MAC Control Element (MAC CE)), MAC Protocol Data Unit (PDU), etc. Broadcast information may also include, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), and Other System Information (OSI).

[0059] The physical layer signaling may also be, for example, downlink control information (DCI).

[0060] The channel for which the TCI state or spatial relationship is set (specified) may also be, for example, at least one of the downlink shared channel (Physical Downlink Shared Channel (PDSCH)), the downlink control channel (Physical Downlink Control Channel (PDCCH)), the uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and the uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0061] In addition, the RS that has a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SynchronizationSignal 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 QRS).

[0062] The SSB is a signal block that includes at least one of the primary synchronization signal (PSS), the secondary synchronization signal (SSS), and the broadcast channel (Physical Broadcast Channel (PBCH)). The SSB may also be referred to as an SS / PBCH block.

[0063] The UE may also receive configuration information of a list of information elements containing TCI states (e.g., PDSCH-Config, tci-StatesToAddModList) through higher layer signaling.

[0064] The TCI state information element (RRC's "TCI-state IE") set through higher-layer signaling may also include a TCI state ID and one or more QCL information ("QCL-Info"). The QCL information may also include at least one of information related to the RS that forms a QCL relationship (RS relationship information) and information about the QCL type (QCL type information). The RS relationship information may also include information such as the RS index (for example, SSB index, non-zero-power CSI-RS (Non-Zero-Power (NZP) CSI-RS) resource ID (Identifier)), the index of the cell where the RS is located, and the index of the broadband part (Bandwidth Part (BWP)) where the RS is located.

[0065] In Rel.15NR, as at least one TCI state of PDCCH and PDSCH, both QCL type A RS and QCL type D RS can be set for the UE, or only QCL type A RS can be set.

[0066] When TRS is configured as a QCL Type A RS, it is assumed that the TRS is different from the demodulation reference signal (DMRS) of PDCCH or PDSCH, and the same TRS is transmitted periodically over a long period of time. The UE can measure the TRS and calculate average delay, delay spread, etc.

[0067] A UE for which the TRS RS is configured as QCL Type A in the TCI state of the DMRS of the PDCCH or PDSCH can assume that the parameters of the QCL Type A of the DMRS of the PDCCH or PDSCH and the TRS (average delay, delay spread, etc.) are the same. Therefore, the parameters of the Type A of the DMRS of the PDCCH or PDSCH (average delay, delay spread, etc.) can be determined from the measurement results of the TRS. The UE can use the measurement results of the TRS to perform more accurate channel estimation when performing channel estimation on at least one of the PDCCH and PDSCH.

[0068] A UE configured with a QCL type D RS can use the QCL type D RS to determine a UE reception beam (spatial filter, UE spatial filter).

[0069] The RS of QCL type X in the TCI state may mean an RS that is in a QCL type X relationship with a certain channel / signal (DMRS), and the RS may also be referred to as a QCL source of QCL type X in the TCI state.

[0070] <TCI status for PDCCH>

[0071] The information about QCL between the PDCCH (or the DeModulation Reference Signal (DMRS) antenna port associated with the PDCCH) and a certain RS may also be referred to as the TCI state for the PDCCH, etc.

[0072] The UE may also determine the TCI state for a UE-specific PDCCH (CORESET) based on higher layer signaling. For example, the UE may also configure one or more (K) TCI states for each CORESET via RRC signaling.

[0073] For each CORESET, the UE can also activate one of multiple TCI states set by RRC signaling through a MAC CE. 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.

[0074] (RLM)

[0075] Radio Link Monitoring (RLM) is also used in NR.

[0076] 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).

[0077] 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).

[0078] Parameters related to RLM-RS may also include information indicating the purpose of supporting 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).

[0079] The UE may also determine the RLM-RS resource based on the index corresponding to the RLM-RS resource and implement RLM using the RLM-RS resource.

[0080] In the case where the UE is not provided with 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 perform the following operations.

[0081] When the activated TCI state for PDCCH reception includes only one RS, the UE may use the RS provided for the TCI state for the activated TCI state for PDCCH reception for RLM.

[0082] When the activated TCI state for PDCCH reception includes two RSs, the UE assumes that one RS has QCL type D (expect) and uses the RS with QCL type D for RLM. The UE does not assume that both RSs have QCL type D (not expected).

[0083] • The UE may not need to use aperiodic or semi-persistent RS for RLM.

[0084] ·For L max (Maximum number of SS / PBCH block candidates per half frame) = 4. The UE may also select N blocks provided for the activated TCI state for PDCCH reception in the CORESET associated with the search space set in the order of the search space set from the shortest monitoring period. RLM In the case that more than one CORESET is associated with a search space set with the same monitoring period, the UE may also determine the order of the CORESETs from the highest CORESET. The UE may also select N CORESETs according to the order of the CORESETs. RLM RS.

[0085] In the case that the UE is not provided with RadioLinkMonitoringRS, the UE may not be assumed to be RLM A RadioLinkMonitoringRS is used for RLM.

[0086] 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.

[0087] 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.

[0088] In Rel. 16, a maximum of five CORESETs are configured for multi-TRP transmission using multiple PDCCHs (the aforementioned multi-master mode). A CORESET pool index (CORESETPoolIndex) is configured for each CORESET.

[0089] When the UE is not provided with information about the RLM RS (when the UE is not explicitly notified of information about the RLM RS), the following questions 1 and 2 are considered as to how the UE determines the RLM-RS.

[0090] <Question 1>

[0091] 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 L is 4. In Rel.16, the maximum number of CORESETs is 5. However, for L 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.

[0092] Question 2

[0093] In NR Rel.15, the UE determines the CORESET with the TCI state for RLM-RS based on the following two factors.

[0094] The monitoring periods of the search spaces associated with the CORESET (in order from the shortest monitoring period);

[0095] CORESET ID (in order from the highest CORESET ID if there is more than one CORESET corresponding to the same monitoring period).

[0096] However, information related to the TRP is not considered in the RLM-RS determination. Regarding the RLM-RS determined by the UE based on the rules of NR Rel.15, the case where it corresponds to only one of the TRPs or is randomly selected from two TRPs is considered. This is inappropriate for multiple PDSCH transmissions based on multiple PDCCHs in a multi-TRP scenario.

[0097] If the RLM-RS determination method is unclear, RLM cannot be performed appropriately, and there is a concern that system performance may be degraded.

[0098] Therefore, the inventors of the present invention have devised a method for determining an RLM-RS when the UE is not provided with an RLM-RS (when the UE is not explicitly configured with the RLM-RS through RRC signaling).

[0099] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the various embodiments may be applied individually or in combination.

[0100] In the present disclosure, "A / B" and "at least one of A and B" may be used interchangeably. In the present disclosure, cell, CC, carrier, BWP, and band may be used interchangeably. In the present disclosure, index, ID, indicator, and resource ID may be used interchangeably. In the present disclosure, RRC parameters, higher layer parameters, RRC information elements (IEs), and RRC messages may be used interchangeably.

[0101] (Wireless Communication Method)

[0102] In the present disclosure, a UE with multiple TRPs set can also determine at least one of the TRP 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.

[0103] The value of a specific field included in the DCI (e.g., a field specifying the TRP, an antenna port field, a PRI).

[0104] DMRS corresponding to the scheduled PDSCH / PUSCH (e.g., the DMRS sequence, resources, CDM group, DMRS port, DMRS port group, antenna port group, etc.).

[0105] DMRS corresponding to the PDCCH on which the DCI is transmitted (for example, the DMRS sequence, resources, CDM group, DMRS port, DMRS port group, etc.).

[0106] 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 the sequence ID), resources, etc.).

[0107] RS (RS related groups, etc.) for TCI status, QCL assumptions, spatial relationship information, etc.

[0108] 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)).

[0109] In the present disclosure, it is also conceivable that when multiple TRPs utilize an ideal backhaul, a single PDCCH is supported, and when multiple TRPs utilize a non-ideal backhaul, multiple PDCCHs are supported.

[0110] 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.

[0111] In the present disclosure, TRP and panel may be interchangeable. TRP association ID may also correspond to at least one of the TRP and the panel. In the present disclosure, TRP association ID, TRP ID representing the TRP, panel ID representing the panel, CORESET pool ID for the CORESET of the PDCCH from the TRP or panel, CORESET ID representing the CORESET of the PDCCH from the TRP or panel, and other indexes corresponding to the TRP or panel (such as DMRS port group ID) may also be interchangeable.

[0112] 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.

[0113] <Implementation Method 1>

[0114] It is also possible to define operations when the UE is not configured with a CORESET pool index and operations when the UE is configured with a CORESET pool index.

[0115] In the case where 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-RSs for PDCCH reception, the UE may also perform the following operations.

[0116] When the activated TCI state for PDCCH reception includes only one RS, the UE may use the RS provided for the TCI state for the activated TCI state for PDCCH reception for RLM.

[0117] When the activated TCI state for PDCCH reception includes two RSs, the UE assumes that one RS has QCL type D (expect) and uses the RS with QCL type D for RLM. The UE does not assume that both RSs have QCL type D (not expected).

[0118] • The UE may not need to use aperiodic or semi-persistent RS for RLM.

[0119] ·For L max (Maximum number of SS / PBCH block candidates per half frame) = 4. The UE may also select N blocks provided for the activated TCI state for PDCCH reception in the CORESET associated with the search space set in the order of the search space set starting from the shortest monitoring period (in ascending order of the monitoring period). RLM In the case that 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 select N CORESETs according to the order of the CORESETs. RLM RS.

[0120] When PDCCH setting information (higher layer parameter PDCCH-Config) is set by two different values ​​of the CORESET pool index (CORESETPoolIndex) within the CORESET information (ControlResourceSet) and the UE is not provided with RLM-RS information (RadioLinkMonitoringRS), and the UE is provided with a TCI state including one or more CSI-RS for PDCCH reception, the UE may also perform the following operations.

[0121] When 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 in the CORESET associated with the lowest CORESET pool index for RLM.

[0122] When the activated TCI state for PDCCH reception in the CORESET associated with the lowest CORESET pool index 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.

[0123] • The UE may not need to use aperiodic or semi-persistent RS for RLM.

[0124] ·For L max = 4, the UE selects the CORESET associated with the lowest CORESET pool index and the N provided for the activated TCI state for PDCCH reception within the CORESET associated with the search space set in the order of the search space sets from the shortest monitoring period. RLM In the case that more than one CORESET associated with the lowest CORESET pool index 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. The UE may also select N CORESETs according to the order of the CORESETs. RLM RS.

[0125] In the present disclosure, PDCCH configuration information (PDCCH-Config) and CORESET lists (controlResourceSetToAddModList) may also be interchangeable. In the present disclosure, PDCCH configuration information including two different values ​​of the CORESET pool index within the CORESET information, PDCCH configuration information including two different values ​​of the CORESET pool index, two CORESET information each including two different values ​​of the CORESET pool index, and PDCCH configuration information including two CORESET information each including two different values ​​of the CORESET pool index may also be interchangeable.

[0126] exist Figure 2 In this example, CORESET pool 0, 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.

[0127] In this example, L max =4, N RLM =2.

[0128] Since CORESET pool 0 has the lowest CORESET pool index, the UE selects TCI state 2 for the PDCCH in CORESET 0 that is associated with the search space set with the shortest monitoring period of 10ms in the CORESETs in CORESET pool 0 in the order of monitoring period. Since CORESET 1 and 2 in CORESET pool 0 are associated with the search space set with the same monitoring period of 20ms, the UE selects TCI state 3 for the PDCCH in CORESET 2 in the order from the highest CORESET index. Through this operation, the UE determines the RSs of the selected TCI states 2 and 3 as N RLM (2) RLM-RS.

[0129] 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.

[0130] <Implementation Method 2>

[0131] The UE may also not assume that the CORESET pool index is not configured (not provided).

[0132] In the case where the UE is not provided with RLM-RS information (Radio Link Monitoring RS) and the UE is provided with a TCI state including one or more CSI-RSs for PDCCH reception, the UE may also perform the following operations.

[0133] When the activated TCI state for PDCCH reception includes only one RS, the UE may use the RS provided for the TCI state for the activated TCI state for PDCCH reception in the CORESET associated with the lowest CORESET pool index for RLM.

[0134] When the activated TCI state for PDCCH reception in the CORESET associated with the lowest CORESET pool index 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.

[0135] • The UE may not need to use aperiodic or semi-persistent RS for RLM.

[0136] ·For L max = 4, the UE selects the CORESET associated with the lowest CORESET pool index and the N provided for the activated TCI state for PDCCH reception in the CORESET associated with the search space set in the order of the search space sets from the shortest monitoring period. RLM In the case that more than one CORESET associated with the lowest CORESET pool index 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. The UE may also select N CORESETs according to the order of the CORESETs. RLM RS.

[0137] According to the above-described second embodiment, the UE assumes that the CORESET pool index is set, and can appropriately select the RLM-RS.

[0138] <Implementation Method 3>

[0139] In the case that the UE is not provided with RLM-RS (in the case that it is not explicitly set through RRC signaling), the UE may also select N according to the RLM-RS decision rule in NR Rel.15. RLM RLM-RS. In this case, the UE may also determine the RS in TCI state associated with at least one TRP as the RLM-RS.

[0140] Can also be used with L max = 4, the RLM-RS decision rule is the same as that of L max =8 or L max =64 equal to more than 4 L max The corresponding N RLM RS.

[0141] The RLM-RS determination rule may be one of the following rules 1-1 to 1-4.

[0142] Rule 1-1 (same as the RLM-RS decision rule in NR Rel.15)

[0143] The UE may also select N provided for the activated TCI state for PDCCH reception in the CORESET associated with the search space set in the order of the search space set from the shortest monitoring period. RLMIn case more than one CORESET is associated with a search space set with the same monitoring period, the UE may also determine the order of the CORESETs starting from the highest CORESET index.

[0144] Rules 1-2

[0145] The UE may also select N provided for the activated TCI state for PDCCH reception in the CORESET associated with the search space set in the order of the search space set from the shortest monitoring period. RLM In the case that more than one CORESET is associated with a search space set with the same monitoring period, the UE may also determine the order of the CORESETs starting from the lowest CORESET index.

[0146] Rules 1-3

[0147] The UE may also select N provided for the activated TCI state for PDCCH reception in the CORESET associated with the search space set in the order of the search space set from the longest monitoring period. RLM In case more than one CORESET is associated with a search space set with the same monitoring period, the UE may also decide the order of the CORESETs from the highest CORESET index.

[0148] Rules 1-4

[0149] The UE may also select N provided for the activated TCI state for PDCCH reception in the CORESET associated with the search space set in the order of the search space set from the longest monitoring period. RLM In the case that more than one CORESET is associated with a search space set with the same monitoring period, the UE may also determine the order of the CORESETs starting from the lowest CORESET index.

[0150] When selecting in order from the longest monitoring period (rules 1-3, 1-4), if failures frequently occur in the PDCCH having the longest monitoring period, the failures can be reduced by RLM.

[0151] When selecting in order from the lowest CORESET ID (rules 1-2, 1-4), a specific CORESET such as CORESET0 can be preferentially selected.

[0152] exist Figure 3In the example, the monitoring period of TRP, CORESET pool, CORESET, search space set, and the structure of TCI state are Figure 2 same.

[0153] In this example, L max =4, N RLM =2, UE uses rule 1-1.

[0154] The UE selects TCI states 2 and 4 for PDCCH in CORESETs 0 and 3 associated with the search space set with the shortest monitoring period of 10ms from among all CORESETs in the CORESET pool. Through this operation, the UE determines the RS of the selected TCI states 2 and 4 as N RLM (2) RLM-RS.

[0155] According to the above embodiment 3, in L max =8 and N RLM =4, the UE can also determine the RLM-RS.

[0156] <Implementation Method 4>

[0157] For any of the RLM-RS determination rules in NR Rel.15 and Implementation Methods 1 to 3, the following restriction may be added, namely, using the activated TCI state for PDCCH reception within the CORESET with the lowest or highest TRP association ID.

[0158] PDCCH configuration information (e.g., PDCCH-Config) may also include CORESET information (e.g., controlResourceSet) and search space information (e.g., searchSpace). The CORESET information may also include a CORESET ID (index, e.g., controlResourceSetId) and a CORESET pool index. The CORESET pool index (CORESET group ID) may also be an ID corresponding to at least one of a PDSCH, a codeword, a DMRS port group, a panel, and a TRP.

[0159] In case the UE is not provided with RadioLinkMonitoringRS and the UE is provided with a TCI state containing more than one CSI-RS for the PDCCH within the CORESET with the lowest or highest TRP Association ID:

[0160] When the activated TCI state for PDCCH reception in the CORESET with the lowest or highest TRP association ID includes only one RS, the UE may use the RS provided for the TCI state for the activated TCI state for the PDCCH for RLM.

[0161] ·When the activated TCI state for PDCCH reception within the CORESET with the lowest or highest TRP association ID includes two RSs, the UE assumes that one RS has QCL type D, and the UE uses the RS of QCL type D for RLM. The UE does not assume that both RSs have QCL type D.

[0162] • The UE may not be requested to use aperiodic or semi-persistent RS for RLM.

[0163] ·For L max =4, the UE may also select N provided for the activated TCI state for PDCCH reception in the CORESET associated with the search space set in the order from the shortest monitoring period of the search space set in the CORESET with the lowest or highest TRP association ID. RLM In case more than one CORESET is associated with a search space set with the same monitoring period, the UE may also determine the order of the CORESETs starting from the highest CORESET index.

[0164] In the case that the UE is not provided with RadioLinkMonitoringRS, the UE may not assume that the N RLM Multiple RadioLinkMonitoringRS are used for RLM.

[0165] exist Figure 4 In the example, the monitoring period of TRP, CORESET pool, CORESET, search space set, and the structure of TCI state are Figure 2 same.

[0166] In this example, L max =4, N RLM =2, the UE uses rule 1-1. In this example, the TRP association ID is the CORESET pool index.

[0167] In this example, the RLM-RS determination rule is restricted to the PDCCH being the PDCCH within the CORESET with the lowest CORESET pool ID. In this example, the UE restricts the RLM-RS to the activated TCI state for the PDCCH within the CORESET within CORESET pool 0 (TRP0).

[0168] In the CORESET with the lowest CORESET pool ID, the UE selects TCI state 2 for the PDCCH in CORESET0 associated with the search space set with the shortest monitoring period of 10ms in the order of monitoring period, and selects TCI state 3 for the PDCCH in CORESET2 with the highest CORESET index among the two CORESETs associated with the search space set with the second shortest monitoring period of 20ms. Through this operation, the UE determines the RS of TCI states 2 and 3 from CORESET pool 0 corresponding to one TRP as N RLM (2) RLM-R.

[0169] In NR Rel.15, the UE has an RRC connection for one TRP, so the RLM-RS is associated only with that TRP. According to implementation 4, multiple RLM-RSs associated with a specific TRP (connected TRP, default TRP) are selected, so that RLM for a specific TRP can be reliably performed.

[0170] <Implementation Method 5>

[0171] For NR Rel.15, any of the RLM-RS determination rules in Implementation Methods 1 to 3, the following extension can be added: the UE will use the two RSs provided for the activated TCI state for PDCCH reception within the CORESET with two TRP association IDs as RLM-RS.

[0172] Step 1

[0173] The UE may also use at least two RSs for RLM-RS in the activated TCI state for PDCCH reception from different TRP association IDs. The UE may also select RLM-RS within each TRP association ID using the RLM-RS determination rule of NR Rel.15 or any of Embodiments 1 to 3.

[0174] Step 2

[0175] After the UE determines at least two RLM-RSs from different TRP association IDs, the UE may also determine the remaining RLM-RSs based on one of the following steps 2-1 and 2-2.

[0176] <<Step 2-1>>

[0177] The UE may determine the remaining RLM-RSs based on the RLM-RS determination rule of NR Rel.15 or any one of Implementation Methods 1 to 3.

[0178] <<Step 2-2>>

[0179] The UE may determine the remaining RLM-RSs sequentially from two TRPs or different TRP association IDs. The UE may also determine the RLM-RSs in each TRP association ID based on any one of the RLM-RS determination rules in NR Rel.15 and Implementations 1 to 3.

[0180] exist Figure 5 In the example, the monitoring period of TRP, CORESET pool, CORESET, search space set, and the structure of TCI state are Figure 2 same.

[0181] In this example, L max =8, N RLM =4, the UE uses rule 1-1. In this example, the TRP association ID is the CORESET pool index.

[0182] In step 1, the UE determines the RLM-RS from each of the different CORESET pools based on rule 1-1. In this example, the UE selects TCI state 2 for the PDCCH in CORESET0 associated with the search space set with the shortest monitoring period of 10ms in CORESET pool 0 as the RLM-RS, and selects TCI state 4 for the PDCCH in CORESET3 associated with the search space set with the shortest monitoring period of 10ms in CORESET pool 1 as the RLM-RS. Through this operation, the UE selects N RLM Two RLM-RSs among the four RLM-RSs are selected, and the remaining two RLM-RSs are selected in step 2.

[0183] When using step 2-1, the UE determines the remaining RLM-RSs based on rule 1-1. In this example, the UE selects TCI states 3 and 1 for PDCCH within CORESET pool 0, starting from the CORESET with the highest CORESET ID among CORESETs 1 and 2 associated with the search space set with the next monitoring period of 20ms, as RLM-RSs.

[0184] When using step 2-2, the UE determines RLM-RSs from different CORESET pools based on rule 1-1. In this example, the UE selects TCI state 3 for the PDCCH in the CORESET with the highest CORESET ID in CORESETs 1 and 2, which are associated with the search space set with the second shortest monitoring period of 20 ms, within CORESET pool 0, as the RLM-RS, and selects TCI state 5 for the PDCCH in CORESET 4, which is associated with the search space set with the second shortest monitoring period of 40 ms, within CORESET pool 1, as the RLM-RS.

[0185] According to the above embodiment 5, when the UE needs to monitor PDCCHs from two TRPs, since the RLM-RS includes RSs from the two TRPs, it can reliably perform RLM for the two TRPs. For example, when switching between the two TRPs, the wireless link with the two TRPs can be maintained.

[0186] <Implementation Method 6>

[0187] The UE may also report UE capability information (UE capability) including information related to at least one of the following to the network:

[0188] Whether at least one RLM-RS selection operation of the above-mentioned embodiments is supported.

[0189] 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.

[0190] The maximum number of CORESET pool indices supported by the RLM-RS selection operation. The CORESET pool indices may also be at least one of the number per BWP, the number per CC, the number per band, and the number per UE.

[0191] The maximum number of CORESETs supported by the RLM-RS selection operation. The CORESET 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.

[0192] 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).

[0193] Whether to support simultaneous reception of multiple DCIs that are not of a specific QCL relationship (e.g., not QCL type D).

[0194] 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)).

[0195] Whether single DCI is supported.

[0196] Whether multiple DCIs are supported.

[0197] • 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).

[0198] • 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).

[0199] • The number of PDSCHs (or codewords) that a UE can detect (or decode) in the same symbol (eg, OFDM symbol).

[0200] • 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).

[0201] • The number, or maximum number, of RLM-RSs selected by the UE in the event that no RLM-RSs are provided.

[0202] 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.

[0203] The UE may also be considered to select the RLM-RS using a value within the range of values ​​(numbers) reported by the UE capability information.

[0204] According to the above embodiment 6, the UE can appropriately select the RLM-RS according to its capabilities.

[0205] <Other Implementation Methods>

[0206] In each of the above embodiments, at least any one of the following may be applied.

[0207] The operations of each embodiment may also be applied only in a specific frequency range (for example, outside Frequency Range 2 (FR2) and FR1). Such operations can reduce the complexity of the UE.

[0208] The UE can also be assumed to have the RLM-RS number N RLM Not greater than the number of CORESETs.

[0209] In N RLM When the number of CORESETs is greater than the number of UEs, UE can also replace N RLM The number of activated TCI states (the number of TCI states activated by MACCE) is used to determine the RLM-RS with the maximum number of activated TCI states. Consider that the number of activated TCI states is greater than the number of CORESETs.

[0210] 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.

[0211] 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 when at least one of the following conditions is met: receiving DCI scheduling PDSCH, receiving PDSCH from multiple TRPs, and the UE having a TCI state for each TRP; and when the condition is not met.

[0212] (Wireless Communication System)

[0213] 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 one or a combination of the wireless communication methods according to the above-described embodiments of the present disclosure.

[0214] Figure 6 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) or the fifth generation mobile communication system New Radio (5G NR).

[0215] In addition, the wireless communication system 1 can also support dual connectivity between multiple radio access technologies (Radio Access Technologies) (RATs) (Multi-RAT Dual Connectivity (MR-DC)). 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.

[0216] 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.

[0217] 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)).

[0218] 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 located 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 arrangement 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.

[0219] 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).

[0220] 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 (above-24 GHz)). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to this. For example, FR1 may also correspond to a frequency band higher than FR2.

[0221] Furthermore, in each CC, the user terminal 20 may communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0222] 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 can also be called an IAB node.

[0223] 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).

[0224] The user terminal 20 may also be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0225] 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.

[0226] 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 applied to the UL and DL radio access schemes.

[0227] 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.

[0228] 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.

[0229] The PDSCH is used to transmit user data, higher-layer control information, and system information blocks (SIBs). The PUSCH can also be used to transmit user data, higher-layer control information, and the PBCH can also be used to transmit master information blocks (MIBs).

[0230] 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.

[0231] 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, PDSCH may also be replaced by DL data, and PUSCH may also be replaced by UL data.

[0232] 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.

[0233] 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. Furthermore, 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.

[0234] 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 (HARQ-ACK)), ACK / NACK, etc.), and scheduling request (SR) may also be transmitted via the PUCCH. A random access preamble used to establish a connection with a cell may also be transmitted via the PRACH.

[0235] 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.

[0236] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. In the wireless communication system 1, as DL-RS, 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. may also be transmitted.

[0237] 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.

[0238] In addition, as an uplink reference signal (UL-RS), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted in the wireless communication system 1. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0239] (Base Station)

[0240] Figure 7 A diagram showing an example of the configuration of a base station according to one embodiment. Base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission path interface (transmission line interface) 140. Furthermore, more than one of each of control unit 110, transceiver unit 120, transceiver antenna 130, and transmission path interface 140 may be provided.

[0241] 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 be omitted.

[0242] 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 the common knowledge in the technical field to which this disclosure relates.

[0243] 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.

[0244] 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 the common knowledge in the technical field involved in this disclosure.

[0245] 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.

[0246] The transmitting and receiving antenna 130 can be formed of an antenna described based on the common knowledge in the technical field to which this disclosure relates, such as an array antenna.

[0247] 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.

[0248] 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.

[0249] 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.

[0250] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filtering, 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.

[0251] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filtering, 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 .

[0252] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filtering, and demodulation into a baseband signal on the radio frequency band signal received via the transmitting and receiving antenna 130 .

[0253] 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), filtering 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.

[0254] 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.

[0255] 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.

[0256] In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 120 , the transmitting and receiving antenna 130 , and the transmission path interface 140 .

[0257] When two or more different control resource set (CORESET) pool indices are configured for the terminal and a radio link monitoring reference signal (RLM-RS) is not configured for the terminal, the control unit 110 may use one or more reference signals for the activated transmission configuration indication (TCI) state associated with the lowest CORESET pool index for radio link monitoring. The transmitting and receiving unit 120 may also transmit the one or more reference signals.

[0258] (User Terminal)

[0259] Figure 8This 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.

[0260] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, but 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 be omitted.

[0261] 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.

[0262] 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.

[0263] 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 the common knowledge in the technical field involved in this disclosure.

[0264] 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.

[0265] The transmitting and receiving antenna 230 can be formed of an antenna described based on the common knowledge in the technical field to which this disclosure relates, such as an array antenna.

[0266] 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.

[0267] 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.

[0268] 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.

[0269] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filtering, 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.

[0270] 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 activated (enabled), the transmitting / receiving unit 220 (transmitting processing unit 2211) may also 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 also perform DFT processing as the aforementioned transmission processing without performing DFT processing.

[0271] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filtering, 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 .

[0272] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may also perform amplification, filtering, and demodulation into a baseband signal on the radio frequency band signal received via the transmitting and receiving antenna 230 .

[0273] The transmitting and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filtering 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.

[0274] 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.

[0275] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0276] When two or more different control resource set (CORESET) pool indices are configured and the radio link monitoring reference signal (RLM-RS) is not configured, the control unit 210 may use one or more reference signals for the activated transmission configuration indication (TCI) state associated with the lowest CORESET pool index for radio link monitoring. The transmitting and receiving unit 220 may also receive the one or more reference signals.

[0277] When the maximum number of candidates for synchronization signal blocks per half frame is 4, the control unit 210 may select one or more reference signals from the CORESET associated with the lowest CORESET pool index in order from the lowest monitoring period of the corresponding search space set.

[0278] When more than one CORESET is associated with the lowest CORESET pool index and associated with a search space set having the same monitoring period, the control unit 210 may select the one or more reference signals from the CORESET associated with the lowest CORESET pool index in the order from the highest CORESET index.

[0279] The transmitting and receiving unit 220 may also receive physical downlink control channel configuration information (eg, PDCCH-Config) including a CORESET pool index.

[0280] The one or more reference signals may also be two reference signals.

[0281] (Hardware Structure)

[0282] 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.

[0283] 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.

[0284] 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 9 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.

[0285] In addition, in this disclosure, the terms "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 figures, or may exclude some of the devices.

[0286] 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.

[0287] 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.

[0288] 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 aforementioned control unit 110 (210) and the transmitting and receiving unit 120 (220) may also be implemented by the processor 1001.

[0289] 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 the program. 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.

[0290] The memory 1002 may also be a computer-readable recording medium, for example, composed 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 appropriate 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 can store executable programs (program code), software modules, etc. for implementing the wireless communication method according to one embodiment of the present disclosure.

[0291] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical / magnetic 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 appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0292] 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 be configured to 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) and the transmitting and receiving antenna 130 (230) may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be physically or logically separated from the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0293] 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).

[0294] 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.

[0295] Furthermore, the base station 10 and 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). Such hardware may be used to implement part or all of each functional block. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0296] (Variation)

[0297] 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.

[0298] 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).

[0299] 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, specific windowing processing performed by the transmitter and receiver in the time domain, and the like.

[0300] 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.

[0301] A time slot may also contain multiple mini-slots. Each mini-slot may also be composed 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 be composed 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 a mini-slot may also be referred to as PDSCH (PUSCH) mapping type B.

[0302] 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.

[0303] For example, a subframe can also be called a TTI, multiple consecutive subframes can also be called a TTI, and a time slot or a mini-time slot can also be called a TTI. In other words, at least one of the subframe and the TTI can be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. In addition, the unit representing the TTI can also be called a time slot, a mini-time slot, etc. instead of a subframe.

[0304] 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.

[0305] 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.

[0306] Furthermore, when a time slot or a mini-time slot is referred to as a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) may also be the minimum time unit for scheduling. Furthermore, the number of time slots (mini-time slots) constituting the minimum time unit for scheduling may also be controlled.

[0307] 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.

[0308] In addition, long TTI (for example, normal TTI, subframe, etc.) can also be interpreted as TTI with a time length exceeding 1ms, and short TTI (for example, shortened TTI, etc.) can also be interpreted as TTI with a TTI length smaller than long TTI and greater than 1ms.

[0309] 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 contained in an RB can also be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers contained in an RB can also be determined based on the parameter set.

[0310] 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.

[0311] 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.

[0312] 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.

[0313] 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 parameter set within a 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.

[0314] 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.

[0315] 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, "cell," "carrier," etc. in this disclosure may also be interpreted as "BWP."

[0316] 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.

[0317] 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.

[0318] In this disclosure, the names used for parameters, etc., are not intended to be limiting in any respect. Furthermore, the mathematical formulas for these parameters, etc., 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.

[0319] 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.

[0320] 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.

[0321] Input and output information, signals, etc. can be stored in a specific location (e.g., memory) or managed using a management table. Input and output information, signals, etc. can be overwritten, updated, or appended. Output information, signals, etc. can also be discarded. Input information, signals, etc. can also be sent to other devices.

[0322] 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.

[0323] 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.

[0324] 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).

[0325] 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).

[0326] Whether software is called software, firmware, middleware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software module, application, software application, software package, routine, sub-routine, object, executable file, execution thread, procedure, function, etc.

[0327] 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.

[0328] 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).

[0329] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)" "Transmission Configuration Indication state (TCI state)" "spatial relation", "spatial domain filter", "transmit power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0330] 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, a small cell, a femto cell, or a pico cell.

[0331] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the base station's overall coverage area 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 (Remote Radio Head (RRH)) for indoor use). Terms such as "cell" or "sector" refer to a portion or the entire coverage area of ​​at least one of a base station and a base station subsystem providing communication services within that coverage area.

[0332] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” are used interchangeably.

[0333] A mobile station is also sometimes referred to as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other appropriate terminology.

[0334] 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 vehicle (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 may also include 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.

[0335] In addition, the base station in the present disclosure can also be interpreted as a user terminal. For example, the various methods / implementations of the present disclosure can 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, it can also be called device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it can also be set as a structure in which the user terminal 20 has the functions of the above-mentioned base station 10. In addition, expressions such as "uplink" and "downlink" can also be interpreted as expressions corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can also be interpreted as side channels.

[0336] Likewise, the user terminal in the present disclosure may also be interpreted as a base station. In this case, the base station 10 may also have the functions of the user terminal 20 described above.

[0337] 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 including a base station, various actions 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.

[0338] 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 elements of various steps described in this disclosure are presented in an illustrative order, but are not limited to the specific order presented.

[0339] 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), 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 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. Furthermore, multiple systems may be combined (for example, LTE or LTE-A in combination with 5G, etc.) for application.

[0340] 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.”

[0341] 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 necessarily imply that only two elements may be used, or that the first element necessarily takes precedence over the second element in some manner.

[0342] The term "determining" as used in this disclosure may encompass a variety of actions. For example, "determining" may also be considered as "judging," calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), ascertaining, etc.

[0343] In addition, "judgment (decision)" can also be regarded as a situation of "judgment (decision)" on receiving (for example, receiving information), transmitting (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc.

[0344] In addition, "judgment (decision)" can also be regarded as a situation in which "judgment (decision)" is made on resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can also be regarded as a situation in which "judgment (decision)" is made on some actions.

[0345] In addition, "judgment (decision)" can also be interpreted as "assuming", "expecting", "considering", etc.

[0346] The “maximum transmit power” recorded in this disclosure may mean 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).

[0347] As used in this disclosure, the terms "connected," "coupled," and all variations 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 also be interpreted as "access."

[0348] In the present disclosure, when two elements are connected, it can be considered that they are "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.

[0349] 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 way as "different."

[0350] In this disclosure, when the terms "include," "including," and variations thereof are used, these terms, like the term "comprising," have an inclusive meaning. Furthermore, the term "or" used in this disclosure does not mean an exclusive OR.

[0351] 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.

[0352] 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 having: A control unit, when two or more different control resource set CORESET pool indexes are set and the reference signal for monitoring the quality of the radio link is not set, uses one or more reference signals for an activated transmission setting indication state, i.e., an activated TCI state, associated with the CORESET pool index for monitoring the quality of the radio link; and a receiving unit, receiving the one or more reference signals, Based on the number of the activated TCI states, the control unit selects the one or more reference signals of the activated TCI state for PDCCH reception in the CORESET associated with the search space set in ascending order of monitoring period.

2. The terminal according to claim 1, wherein: In the case where more than one CORESET is associated with a search space set having the same monitoring period, selecting the one or more reference signals in descending order of the CORESETs associated with the CORESET pool index, When the number of the activated TCI states within a CORESET among the more than one CORESETs is greater than a specific number, the control unit selects, in ascending order of the monitoring period, the one or more reference signals of the activated TCI state for PDCCH reception within the CORESET associated with the search space set.

3. A wireless communication method of a terminal, comprising: When two or more different control resource set CORESET pool indexes are set and the reference signal for monitoring the quality of the radio link is not set, a step of using one or more reference signals for an activated transmission configuration indication state, i.e., an activated TCI state, associated with the CORESET pool index, for monitoring the quality of the radio link; and the step of receiving said one or more reference signals, Based on the number of the activated TCI states, the terminal selects the one or more reference signals of the activated TCI state for PDCCH reception in the CORESET associated with the search space set in ascending order of monitoring period.

4. A system having a terminal and a base station, wherein: The terminal has: A control unit, when two or more different control resource set CORESET pool indexes are set and the reference signal for monitoring the quality of the radio link is not set, uses one or more reference signals for an activated transmission setting indication state associated with the CORESET pool index, i.e., an activated TCI state, for monitoring the quality of the radio link; as well as a receiving unit, receiving the one or more reference signals, The control unit selects, based on the number of the activated TCI states, the one or more reference signals of the activated TCI states for PDCCH reception in the CORESET associated with the search space set in ascending order of monitoring periods, The base station includes a transmission unit that transmits the one or more reference signals.

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