WO2022208898A1

WO2022208898A1 - Terminal, base station, and measurement method

Info

Publication number: WO2022208898A1
Application number: PCT/JP2021/014407
Authority: WO
Inventors: 尚哉芝池; 浩樹原田; 聡永田; チーピンピ; ジンワン; ランチン
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2021-04-02
Filing date: 2021-04-02
Publication date: 2022-10-06
Also published as: CN117044279A

Abstract

This terminal comprises: a reception unit for receiving, from a base station, configuration information of a non-periodic reference signal to be used in radio link monitoring or beam failure recovery; and a control unit for executing, on the basis of a trigger due to downlink control information received from the base station, measurement for radio link monitoring or beam failure recovery using the non-periodic reference signal.

Description

Terminal, base station and measurement method

The present invention relates to terminals, base stations, and measurement methods in wireless communication systems.

NR (New Radio) (also known as "5G"), which is the successor system to LTE (Long Term Evolution), requires a large capacity system, high data transmission speed, low latency, simultaneous Techniques satisfying connection, low cost, power saving, etc. are being studied (for example, Non-Patent Document 1). Also, in NR, the use of high frequency bands such as 52.6 to 114.25 GH is under consideration.

In addition, in the NR system, in order to extend the frequency band, a frequency band (unlicensed band) different from the frequency band (licensed band) licensed by the telecommunications carrier (operator), an unlicensed carrier ( Unlicensed carrier), unlicensed CC (also called unlicensed CC)) is supported.

In NR, various functions for radio link failure detection and recovery are defined (eg Non-Patent Documents 2-5). Also, in NR, various functions for beam failure detection and its recovery are defined (for example, Non-Patent Documents 2 to 5).

However, terminals that comply with existing NR regulations that assume frequency bands up to 52.6 GHz will not be able to use radio links/beams in high frequency bands such as 52.6 to 114.25 GH, where the use of the unlicensed band is assumed. Failure detection and recovery may not be performed properly.

The present invention has been made in view of the above points, and aims to provide a technology that enables a terminal to appropriately perform failure detection and recovery in a wireless communication system.

According to the disclosed technique, a receiving unit that receives configuration information of an aperiodic reference signal used for radio link monitoring or beam failure recovery from a base station;
a control unit that performs measurement for radio link monitoring or beam failure recovery using the aperiodic reference signal based on a trigger by downlink control information received from the base station.

According to the disclosed technique, a technique is provided that enables a terminal to appropriately perform failure detection and recovery in a wireless communication system.

1 is a diagram for explaining a radio communication system according to an embodiment of the present invention; FIG. 1 is a diagram for explaining a radio communication system according to an embodiment of the present invention; FIG. FIG. 4 is a diagram showing an example of bands; It is a figure which shows the relationship between SCS and symbol length. It is a figure which shows the example of a basic procedure in embodiment of this invention. It is a figure which shows the procedure example of RLM/RLF. FIG. 3 is a diagram for explaining Rel-15 BFR; FIG. 3 is a diagram for explaining Rel-16 BFR; It is a figure which shows the example of the specification about RLM/BFD. FIG. 4 is a diagram showing an example of a specification for BFR; It is a diagram for explaining the transmission status of CSI-RS / SSB when performing LBT. FIG. 13 is a diagram showing an example of an Aperiodic CSI report triggering procedure of R-16; It is a figure which shows the example of a specification. FIG. 12 is a diagram showing an example of a specification in Example 3; FIG. 12 is a diagram showing an example of a specification in Example 3; FIG. 12 is a diagram showing an example of a specification in Example 3; FIG. 12 is a diagram showing an example of setting information in Example 3; FIG. 12 is a diagram showing an example of setting information in Example 3; FIG. 12 is a diagram showing an example of a specification in Example 3; FIG. 12 is a diagram showing an example of a specification in Example 3; FIG. 13 is a diagram showing an example of a specification in Example 4; It is a figure showing an example of functional composition of base station 10 in an embodiment of the invention. 2 is a diagram showing an example of the functional configuration of terminal 20 according to the embodiment of the present invention; FIG. 2 is a diagram showing an example of hardware configuration of base station 10 or terminal 20 according to an embodiment of the present invention; FIG.

Embodiments of the present invention will be described below with reference to the drawings. In addition, the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

Existing technologies are appropriately used for the operation of the wireless communication system according to the embodiment of the present invention. The existing technology is, for example, existing NR. The wireless communication system (base station 10 and terminal 20) in this embodiment basically operates according to existing regulations (eg, Non-Patent Documents 1 to 5). However, the base station 10 and the terminal 20 also perform operations that are not covered by the existing regulations in order to solve problems when using a high frequency band or unlicensed band. In the description of the embodiments to be described later, operations that are not covered by the existing regulations are mainly described. Numerical values described below are all examples.

Further, in the embodiment of the present invention, the duplex system may be a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, or other (for example, Flexible Duplex, etc.) method may be used.

Further, in the embodiment of the present invention, "configuring" the wireless parameters and the like may mean that predetermined values are preset (Pre-configure), or the base station 10 or A wireless parameter notified from the terminal 20 may be set.

In the embodiments described later, Apriodic CSI-RS is taken as an example of the reference signal used for RLM/BFR, but the aperiodic reference signal to which the technology according to the present invention can be applied is Apriodic CSI-RS. It is not limited to RS. For example, as an aperiodic reference signal to which the technology according to the present invention can be applied, an aperiodic synchronization signal may be used, or a reference signal other than SCI-RS may be used.

(System configuration)

FIG. 1 is a diagram for explaining a wireless communication system according to an embodiment of the present invention. A wireless communication system according to an embodiment of the present invention includes a base station 10 and terminals 20, as shown in FIG. Although one base station 10 and one terminal 20 are shown in FIG. 1, this is an example and there may be more than one.

The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. A physical resource of a radio signal is defined in the time domain and the frequency domain.

　OFDM is used as the radio access method. In the frequency domain, subcarrier spacings (SCS) of at least 15 kHz, 30 kHz, 120 kHz and 240 kHz are supported. In addition, regardless of the SCS, a resource block is composed of a predetermined number (for example, 12) of continuous subcarriers.

Terminal 20 detects SSB (SS/PBCH block) when performing initial access, and identifies SCS in PDCCH and PDSCH based on PBCH included in SSB.

Also, in the time domain, a slot is composed of a plurality of OFDM symbols (for example, 14 regardless of subcarrier intervals). An OFDM symbol is hereinafter referred to as a "symbol". A slot is a scheduling unit. Also, a subframe of 1 ms interval is defined, and a frame composed of 10 subframes is defined. Note that the number of symbols per slot is not limited to 14.

As shown in FIG. 1, the base station 10 transmits control information or data to the terminal 20 via DL (Downlink) and receives control information or data from the terminal 20 via UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to transmit and receive signals. Also, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output) communication to DL or UL. Also, both the base station 10 and the terminal 20 may communicate via SCell (Secondary Cell) and PCell (Primary Cell) by CA (Carrier Aggregation).

The terminal 20 is a communication device having a wireless communication function, such as a smartphone, mobile phone, tablet, wearable terminal, or M2M (Machine-to-Machine) communication module. As shown in FIG. 1 , the terminal 20 receives control information or data from the base station 10 on the DL and transmits control information or data to the base station 10 on the UL, thereby performing various functions provided by the wireless communication system. Use communication services.

The terminal 20 can perform carrier aggregation in which multiple cells (multiple CCs (component carriers)) are bundled and communicated with the base station 10 . In carrier aggregation, one PCell (primary cell) and one or more SCells (secondary cells) are used. A PUCCH-SCell with PUCCH may also be used.

FIG. 2 shows a configuration example of a radio communication system when NR-DC (NR-Dual connectivity) is executed. As shown in FIG. 2, a base station 10A serving as MN (Master Node) and a base station 10B serving as SN (Secondary Node) are provided. The base station 10A and base station 10B are each connected to a core network. Terminal 20 communicates with both base station 10A and base station 10B.

A cell group provided by the MN base station 10A is called MCG (Master Cell Group), and a cell group provided by the SN base station 10B is called SCG (Secondary Cell Group). In DC, MCG is composed of one PCell and one or more SCells, and SCG is composed of one PSCell (Primary SCell) and one or more SCells. In this specification, CC (component carrier) and cell may be used synonymously. Also, PCell and PSCell may be called SPCell.

In the wireless communication system according to the present embodiment, LBT (Listen Before Talk) is performed when an unlicensed band is used. The base station 10 or the terminal 20 performs signal sensing, and transmits when the sensing result is idle, and does not transmit when the sensing result is busy. In addition, LBT is not necessarily performed in the unlicensed band, and LBT may not be performed in the unlicensed band.

(About frequency band)
FIG. 3 shows examples of frequency bands used in existing NR and frequency bands used in the radio communication system according to this embodiment. There are two frequency bands, FR1 (0.41 GHz to 7.125) and FR2 (24.25 GHz to 52.6 GHz), as frequency bands (which may be called frequency ranges) in the existing NR. As shown in FIG. 3, FR1 supports SCS of 15 kHz, 30 kHz, and 60 kHz, and a bandwidth (BW) of 5 to 100 MHz. FR2 supports 60 kHz, 120 kHz and 240 kHz (SSB only) as SCS, and 50-400 MHz as bandwidth (BW).

In the radio communication system according to the present embodiment, it is assumed that a frequency band higher than 52.6 GHz (for example, 52.6 GHz to 114.25 GHz), which is not used in existing NR, will also be used. This frequency band may be referred to as FR4.

Also, in the present embodiment, it is assumed that an SCS wider than the existing SCS will be used as the frequency band is expanded as described above. For example, 480 kHz or an SCS wider than 480 kHz is used as the SCS of SSB and PDCCH/PDSCH.

In the high frequency band, it is assumed that many narrow beams will be used to compensate for the large propagation loss. As the SCS, an SCS wider than the existing SCS of FR2 (for example, 480 kHz and 960 kHz) is used.

FIG. 4 is a diagram showing the relationship between SCS and symbol length (time length of symbol). As shown in FIG. 4, the wider the SCS, the shorter the symbol length (symbol time length). Also, if the number of symbols per slot is constant (that is, 14 symbols), the wider the SCS, the shorter the slot length.

Thus, when the number of narrow beams increases and the SCS widens, there is a possibility that radio link/beam failure detection and recovery may not be performed properly if the terminal 20 and the base station 10 operate according to conventional regulations. be. For example, as will be described later, it is also assumed that LBT failures occur frequently, in which case reference signals for radio link/beam failure detection and recovery may not be properly measured.

Techniques for the terminal 20 and the base station 10 to appropriately detect and recover radio link/beam failures will be described below.

(basic behavior)
First, a basic operation example in the wireless communication system of this embodiment will be described with reference to FIG. Since the present embodiment uses Aperiodic CSI-RS in which transmission from the base station 10 and reception (and measurement) at the terminal 20 are performed by a DCI trigger, first, the basics related to Aperiodic CSI-RS An operation example will be described.

In S100, the terminal 20 transmits capability information (UE capability) to the base station 10. Based on this capability information, the base station 10 can determine information to be transmitted to the terminal 20 in S101 and S102 below, for example.

At S101, the base station 10 transmits configuration information to the terminal 20 by means of an RRC message, and the terminal 20 receives the configuration information. The setting information is, for example, setting information related to Aperiodic CSI-RS as described later.

At S102, the base station 10 transmits a DCI trigger to the terminal 20, and the terminal 20 receives the trigger. The trigger is, for example, a trigger for measuring Aperiodic CSI-RS by the terminal 10 for RLM/BFR, as described later. In this embodiment, "A/B" means either A or B, or both A and B. Also, "BFR" means "BFD/new beam selection".

After DCI is received, the terminal 20 receives Aperiodic CSI-RS in S103 after a prescribed time, and performs measurements for radio link/beam failure detection and recovery in S104, for example.

　RLM/RLF and BFR will be described as examples of operations using CSI-RS. Here, operations based on existing technologies disclosed in Non-Patent Documents 1 to 5, etc. will be described.

(RLM/RLF)
First, RLM/RLF will be described. When the terminal 20 (and the base station 10) performs RLM (Radio Link Monitoring) and detects an RLF (Radio Link Failure), RRC connection re-establishment and the like are executed.

In RLM, counter values N310, N311, timers T310, T311, etc., which are thresholds for the number of times, are used. These parameters are received by the terminal 20 from the base station 10 via RRC signaling.

N310 is the threshold for the number of consecutive out-of-sync indications, and when the number of consecutive out-of-sync indications reaches N310, the T310 timer is started.

T310 starts with the above trigger and stops when N311 consecutive in-sync indications are notified. When T310 expires, for example, perform RRC connection re-establishment. T311 starts at the beginning of the RRC connection re-establishment procedure in cell reselection and stops when cell reselection is successful. When T311 expires, the terminal 20 enters the RRC idle state.

An example of RLM procedures in the terminal 20 will be described with reference to FIG. In the terminal 20, when the lower layer (for example, physical layer functional unit) detects an out-of-sync (degradation of radio link quality), it notifies the upper layer (for example, RRC functional unit) of the out-of-sync indication.

When the terminal 20 detects that N310 consecutive out-of-sync indications have been notified from the lower layer to the upper layer, it starts timer T310. When the terminal 20 detects that the lower layer has notified the upper layer of N311 consecutive in-sync indications (radio link normal notification) while the timer T310 is operating, the terminal 20 stops T310. If T310 expires, it is determined that RLF has occurred and the RRC connection re-establishment procedure is performed.

The above in-sync indication is, for example, information defined as follows.

"Upon request from higher layers, the UE provides to higher layers the periodic CSI-RS configuration indexes and/or SS/PBCH block indexes from the set q1~ and the corresponding radio link quality measurements that are larger than or equal to Qin."
That is, in-sync indication is the index of P-CSI-RS for which a radio quality measurement value equal to or greater than a certain threshold Q _in is obtained, or (and may be), SS/PBCH block (hereinafter referred to as SSB). is the index of Also, the target P-CSI-RS index and SSB index are within the set of "q1~". q1 to are parameters notified by RRC signaling from the base station 10 to the terminal 20 by candidateBeamRSList for radio link quality measurement, for example. Note that the radio link quality may be RSRP or RSRQ.

The above out-of-sync indication is defined, for example, by the following.

"PHY in the UE provides an indication to higher layers when the radio link quality for all corresponding resource configurations in the set q0~ that the UE uses to assess the radio link quality is worse than the threshold Qout"
That is, the out-of-sync indication is notified when the radio link quality of all resources in the set "q0~" used by the terminal 20 for radio link quality evaluation is worse than a certain threshold Q _out . Information. q0~ is, for example, a set of P-CSI-RS indices notified by RRC signaling from the base station 10 to the terminal 20 by failureDetectionResources.

(BFD/BFR)
Next, BFD/BFR will be described. Here, a technique for detecting beam failure (BFD) and performing beam recovery (BFR) will be described. First, a basic operation example in the BFD/BFR of this embodiment will be described with reference to FIGS. 7 and 8. FIG.

First, an operation example of BFD/BFR in PCell/PSCell (BFR of R-15) will be described with reference to FIG.

In S10, the terminal 20 receives the reference signal (CSI-RS, SSB, or both CSI-RS and SSB) transmitted for each beam from the base station 10, and measures its quality (RSRP, RSRQ, etc.) . Here, when the terminal 20 determines that the quality of all reference signals (that is, beams) has deteriorated a predetermined number of times, the terminal 20 searches for a new beam in S11.

All reference signals in S10 are sets (failure detection resources) of (indexes of) reference signals set in the terminal 20 from the base station 10, which are measured for beam failure detection, and are referred to as q0. call. For example, 8 is set for this.

In S11, the terminal 20 measures the L1-RSRP of the candidate reference signal (candidateBeamRSList set by the base station 10 and is referred to as q1), and newly selects the reference signal (beam) with the maximum L1-RSRP. Select as beam.

At S12, the terminal 12 transmits PRACH (preamble) in the PRACH occurrence corresponding to the selected new beam. The terminal 20 monitors the BFR response (PDCCH) in the BFR response window starting after 4 slots.

Terminal 20 assumes that the PDCCH monitored by CORESET#0 has a QCL relationship with the new beam (reference signal) 28 symbols after receiving the BFR response (of the PDCCH) in S13, and CORESET#0 to monitor the PDCCH.

Next, an operation example of BFD/BFR for SCell (BFR introduced in R-16) will be described with reference to FIG. In FIG. 8, it is assumed that the SCell is provided by the base station 30 .

In S21, the terminal 20 receives the reference signal (CSI-RS, SSB, or both CSI-RS and SSB) transmitted for each beam from the base station 30, and measures its quality (RSRP, RSRQ, etc.) . Here, the terminal 20 transmits an SR (scheduling request) in S21 when the number of times the terminal 20 determines that the quality of all reference signals (that is, beams) has deteriorated reaches a predetermined threshold. Also, in S23, a search for a new beam is performed.

All reference signals in S20 are sets (failure detection resources) of (indexes of) reference signals set in the terminal 20 from the base station 10, which are measured for beam failure detection, and are referred to as q0. call. For example, 8 is set for this.

In S23, the terminal 20 measures the L1-RSRP of the candidate reference signal (candidateBeamRSList set by the base station 10 and is called q1), and newly selects the reference signal (beam) with the maximum L1-RSRP. Select as beam.

At S22, the terminal 20 has received the UL-grant, and uses the resources allocated there to transmit the MAC CE at S24. The MAC CE includes the index of the CC with the beam failure and the index of the new reference signal for each CC (that is, the beam index). The terminal 20 receives the BFR response (PDCCH) in S25.

After 28 symbols from receiving the PDCCH (PDCCH in S25) for scheduling the PUSCH, the terminal 20 assumes that the PDCCH monitored by the SCell thereafter has a QCL relationship with the new beam (reference signal), and sets the PDCCH. Monitor. In addition, the terminal 20 transmits PUSCH transmitted in the SCell after 28 symbols using a spatial domain filter corresponding to the spatial domain filter of the new beam (reference signal). That is, QCL is updated also for PUSCH.

(Regarding setting information such as reference signals)
FIG. 9 shows an example of setting information related to RLM/BFD (Non-Patent Document 2). As shown in FIG. 9, the RadioLinkMonitoringRS can set the purpose, resource, etc. of the reference signal. FIG. 10 shows an example of setting information related to BFR (Non-Patent Document 2).
(Regarding the use of aperiodic reference signals)
Since an unlicensed spectrum (unlicensed band) is included in the 52.6 to 71 GHz frequency band that is assumed to be used in the wireless communication system of the present embodiment, in the wireless communication system of the present embodiment, LBT may be required.

In the RLM and BFR based on the existing technology described above, the terminal 20 receives reference signals (CSI-RS, SSB, or CSI-RS and SSB) periodically transmitted from the base station 10, and measures quality. I do.

However, when LBT is performed in the base station 10, for example, as shown in FIG. 11, LBT may or may not succeed at each transmission timing of the reference signal. Therefore, it is assumed that the base station 10 will not be able to periodically transmit the reference signal, and the terminal 20 will be able to receive the reference signal less frequently. Therefore, there is a possibility that RLM and BFR cannot be executed properly.

In order to solve the above problems, the reference signal that the terminal 20 uses for beam monitoring/selection in RLM or BFR is not a periodic reference signal, but an aperiodic reference signal based on a DCI trigger is used. . The aperiodic reference signal is, for example, Aperiodic CSI-RS.

For example, when terminal 20 and base station 10 use an unlicensed band (or perform LBT), base station 10 transmits a reference signal at the timing when LBT succeeds.

The terminal 20 performs RLM and BFR by measuring the reference signal received aperiodically based on the trigger, for example, by performing the counting process described in FIGS. This allows proper execution of RLF, BFR when LBT is required, without being affected by LBT failure. In addition, the technique which concerns on this invention is applicable also when LBT is not premised.

(About Aperiodic CSI report triggering)
Here, setting information and the like of Aperiodic CSI report triggering based on existing technologies (

Non-Patent Documents

2, 5, etc.) will be described with reference to FIG. 12 .

In order to implement Aperiodic CSI reporting triggering, first, CSI-Aperiodic TriggerStateList is set from the base station 10 to the terminal 20 by RRC. CSI-AperiodicTriggerStateList contains one or more indexed CSI-AperiodicTriggerStates.

Thereafter, one CSI-AperiodicTriggerState in the CSI-AperiodicTriggerStateList is specified by the CSI request field of the DCI transmitted from the base station 10 to the terminal 20 . Note that MAC CE is also used when the number of bits (N _TS ) of the CSI request field is shorter than the length that can specify all of the configured CSI-AperiodicTriggerStates.

One CSI-Aperiodic Trigger State is linked to one or more Report settings, and a Report setting is linked to one or more Resource settings. One resource setting includes one or more CSI-RS resource sets. One CSI-RS resource set contains one or more CSI-RS resources. That is, the terminal 20 can receive the CSI-RS using one or more CSI-RS resources linked to the CSI-AperiodicTriggerState specified by the CSI request field.

FIG. 13 shows an example of CSI-AperiodicTriggerStateList (Non-Patent Document 2). As shown in FIG. 13, CSI-AperiodicTriggerStateList contains one or more CSI-AperiodicTriggerStates, and CSI-AperiodicTriggerState contains one or more resourceSets. resourceSet indicates the NZP-CSI-RS-ResourceSet for channel measurement.

(Detailed issues)
Whether to apply Perioic CSI-RS/SSB to RLM/BFR in the case of applying Aperiodic CSI-RS to RLM/BFR in order to properly execute RLM/BFR even in situations where LBT failure occurs , and how to trigger Aperiodic CSI-RS for RLM/BFR.

That is, if the existing Aperiodic CSI reporting triggering is applied as is, the triggered CSI-RS will be used for CSI/beam reporting or tracking according to ReportQuantity. Therefore, in order to support Aperiodic CSI-RS for RLM/BFR, it is necessary to specify for what purpose (CSI/beam reporting, tracking, or RLM/BFR) triggered Aperiodic CSI-RS is used. The terminal 20 needs to be notified.

For this reason, the present embodiment proposes extension of trigger DCI and extension of RRC setting. Details will be described later.

Although the following Alt1 and Alt2 are conceivable methods for supporting the Aperiodic CSI-RS trigger for RLM/BFR, in this embodiment, Alt1 is adopted in consideration of the impact on the specifications.

Alt1: Reuse the R-16 Aperiodic CSI report triggering procedure as a baseline and extend it.

Atl2: Design a new procedure to support Aperiodic CSI-RS triggers for RLM/BFR.

Examples 1 to 4 and modifications will be described below as specific examples of the present embodiment. Any one or more of Examples 1 to 4 or all of them can be implemented in combination.

(Example 1)
Example 1 is an example from the viewpoint of whether to use only the Aperiodic CSI-RS or to use the Periodic CSI-RS together with the Aperiodic CSI-RS for the measurement in RLM/BFR. Examples 1-1, 1-2, and 1-3 are described below.

<Example 1-1>
In Example 1-1, only Aperiodic CSI-RS is used for measurements in RLM/BFR. In this case, there are variations of Alt1 and Alt2 below for beam selection applied to the Aperiodic CSI-RS.

Alt1: The Aperiodic CSI-RS beam used shall be the same as the beam set in CORESET.

In this case, for example, from the base station 10 to the terminal 20, information indicating the same beam as the beam set in the CORESET is set as setting information (eg, TCI state) regarding the Aperiodic CSI-RS beam.

Alt2: No restrictions are given to the Aperiodic CSI-RS beams used.

<Example 1-2>
In Example 1-2, both Aperiodic CSI-RS and Periodic CSI-RS/SSB can be used for RLM/BFR. That is, the existing Periodic CSI-RS/SSB can be used for RLM/BFR in addition to being used for existing applications such as CSI/beam reporting, and furthermore, Aperiodic CSI-RS can be used for RLM/ Can be used for BFR.

There are variations of Alt1 and Alt2 below for beam selection applied to Aperiodic CSI-RS in Example 1-2.

Alt1: The Aperiodic CSI-RS beam used in RLM/BFR shall be the same as the beam set in the Periodic CSI-RS also used in RLM/BFR. This case assumes the use of Aperiodic CSI-RS as an aid during periods in which Periodic CSI-RS is not transmitted.

In this case, for example, information indicating the same beam as the beam set in Periodic CSI-RS is set from the base station 10 to the terminal 20 as setting information (eg, TCI state) regarding the Aperiodic CSI-RS beam. be done.

Alt2: The Aperiodic CSI-RS beam used in RLM/BFR shall be the same as the beam set in CORESET.

Note that the Aperiodic CSI-RS beam may be the same as or different from the Periodic CSI-RS beam set for BFD. Also, more PDCCH beams may be assumed in BFD.

Alt3: No restrictions are given to the Aperiodic CSI-RS beams used in RLM/BFR.

<Example 1-3>
In Examples 1-3, whether to use Aperiodic CSI-RS or Periodic CSI-RS for RLM/BFR is selected based on conditions.

For example, when LBT is required for signal transmission, the base station 10 determines to use Aperiodic CSI-RS for RLM/BFR, and uses Aperiodic CSI-RS for RLM/BFR for terminal 20 (depending on DCI or RRC settings, which will be described later).

Also, when using a carrier in a specific band (eg, unlicensed band), the base station 10 determines that Aperiodic CSI-RS is used for RLM/BFR, and Aperiodic CSI-RS is used for RLM/BFR. An operation that causes the terminal 20 to use the RS may be performed.

Note that the same embodiment (Example 1-1, Example 1-2, or Example 1-3) may be applied to RLM and BFR, and separate embodiments may be applied to RLM and BFR. may be applied.

(Example 2)
Next, Example 2 will be described. In Example 2, a DCI that extends the existing DCI is used to trigger the Aperiodic CSI-RS for RLM/BFD.

An operation example of the second embodiment will be described with reference to FIG. 5 mentioned above. In S101, configuration information regarding Aperiodic CSI-RS is transmitted from the base station 10 to the terminal 20 by means of an RRC message. The setting information here may be, for example, existing information disclosed in Non-Patent Document 2 (such as CSI-AperiodicTriggerStateList shown in FIG. 11).

In S102, an Aperiodic CSI-RS trigger (measurement trigger for the terminal 20) is transmitted from the base station 10 to the terminal 20 by the extended DCI in the second embodiment. This DCI contains information indicating the use of Aperiodic CSI-RS for the purpose of RLM/BFD.

The terminal 20 receives the Aperiodic CSI-RS after a certain period of time from receiving the DCI and performs measurement (S103, S104). This measurement is the measurement done for RLM/BFD. From the standpoint of the base station 10, the DCI transmission is used as a trigger to transmit the Aperiodic CSI-RS after a certain period of time.

More specific examples will be described below as Examples 2-1, 2-2, and 2-3. Any two or all of Examples 2-1, 2-2, and 2-3 may be combined for implementation.

<Example 2-1>
In Example 2-1, the fields of DCI are extended (by adding new fields, etc.). Existing formats (eg, DCI format 0_1, DCI format 0_2) and existing RNTIs may be used as the DCI format and the RNTI for scrambling the DCI.

Also, instead of extending the DCI field, an interpretation (reinterpretation) different from the existing interpretation (reinterpretation) is applied to the existing DCI field (value), and the Aperiodic CSI-RS trigger for RLM/BFD may be realized.

As an extension of the DCI field, for example, a purpose indication field (purpose indication field) may be provided, and the purpose of the trigger may be indicated by (the value of) the purpose indication field.

A plurality of purposes (purpose sets) that can be indicated by the purpose indication field may be defined in the specifications, or may be set from the base station 10 to the terminal 20 by RRC. The purpose set may consist of one or more of purposes 1-7 below.

purpose 1: triggers for existing purposes (e.g. beam/CSI reporting, tracking) purpose 2: triggers for RLM measurements purpose 3: triggers for BFD measurements purpose 4: for both RLM and BFD measurements purpose 5: trigger for RLM or BFD measurements or both RLM and BFD measurements purpose 6: purpose 1+purpose 2/3/4
purpose 7: purpose 1 + purpose 5
For purpose 5 of purposes 1 to 7 above, the terminal 20 that receives the DCI may refer to the RRC settings to identify its purpose (RLM, BFD, or both). Also, purposes 6, 7 indicate that it can be used for both existing and RLM/BFD purposes.

<Example 2-2>
Example 2-2 uses a novel DCI format for triggering Aperiodic CSI-RS for RLM/BFD. When using the new DCI format, the new fields of Example 2-1 may or may not be included.

Upon detecting the new DCI format, the terminal 20 that received the DCI in the new DCI format from the base station 10 determines that the DCI is the DCI for triggering the Aperiodic CSI-RS for RLM/BFD. , the CSI-RS specified in the DCI is used for RLM/BFD measurement.

<Example 2-3>
In Example 2-3, the base station 10 scrambles the existing DCI format with a new RNTI (eg, RLM-BFR-CSI-RNTI) for triggering the Aperiodic CSI-RS for RLM/BFD. Send.

Since the terminal 20 was able to decode the DCI using the new RNTI, the terminal 20 determines that the DCI is the DCI for triggering the Aperiodic CSI-RS for RLM/BFD, and CSI-RS is used for measurements for RLM/BFD.

<Other examples (variations)>
Any DCI of Examples 2-1, 2-2, and 2-3 may be UE specific (terminal specific), may be group common (group common), or may be common within the cell good too.

Also, in either of Examples 2-2 and 2-3, the purpose indication field of Example 2-1 may or may not be included. When the purpose indication field is included in the DCI of Examples 2-2 and 2-3, the purpose set may be any one or more or all of purposes 2 to 7.

<Effect of Example 2>
The terminal 20 that has received the DCI of the second embodiment can determine whether the DCI-triggered Aperiodic CSI-RS is used for CSI/beam reporting or RLM/BFD. In addition, since DCI can accurately determine the purpose of triggering, existing procedures (Rel-16 A-CSI report triggering procedure) can be used, and existing RRC configuration information can be used.

(Example 3)
Next, Example 3 will be described. In the third embodiment, RRC configuration information, which is an extension of existing RRC configuration information, is used in order to trigger an Aperiodic CSI-RS for RLM/BFD.

An operation example of the third embodiment will be described with reference to FIG. In S101, configuration information regarding Aperiodic CSI-RS is transmitted from the base station 10 to the terminal 20 by means of an RRC message. The setting information here is expanded (or changed) from the existing setting information disclosed in Non-Patent Document 2, for example.

In S102, for example, an Aperiodic CSI-RS trigger (measurement trigger for the terminal 20) is transmitted from the base station 10 to the terminal 20 by the existing DCI. This DCI includes the CSI request field described in FIG.

A certain CSI-AperiodicTriggerState is specified by the CSI request field.

In Example 3, the CSI-AperiodicTriggerState specified by the CSI request field is associated with the Aperiodic CSI-RS setting information for RLM/BFD. Therefore, the terminal 20 can receive the Aperiodic CSI-RS and perform measurements for RLM/BFD based on the Aperiodic CSI-RS setting information (S103, S104).

More specific examples will be described below as Examples 3-1, 3-2, 3-3, and 3-4. Any two, any three, or all of Example 3-1, Example 3-2, Example 3-3, and Example 3-4 may be combined.

<Example 3-1>
Conventionally, only periodic measurements were possible for measurements for RLM and BFD. Therefore, in Example 3-1, it is possible to set Aperipdic for CSI-RS for RLM and BFD.

That is, in Example 3-1, Aperipdic CSI-RS configuration information is included in reference signal configuration information for RLM and BFD. When the terminal 20 detects that the Aperipdic CSI-RS associated with the CSI-Aperiodic Trigger State specified by the CSI request field is configured for RLM/BFD, the terminal 20 uses the Aperipdic CSI-RS to , RLM/BFD. There are the following variations Alt1 and Alt2 regarding the use of Aperipdic CSI-RS set for RLM/BFD.

Alt1: Aperipdic CSI-RS for RLM/BFD linked to CSI-AperiodicTriggerState may also be used for existing uses (CSI/beam reporting, etc.).

Alt2: Whether or not Aperipdic CSI-RS for RLM/BFD linked to CSI-Aperiodic Trigger State can also be used for existing purposes (CSI/beam reporting, etc.) is determined by the RRC parameter in the Aperipdic CSI-RS setting information may be specified in

<Specific example of Example 3-1>
A specific example of setting information in the embodiment 3-1 will be described.

For example, a new IE parameter (eg RadioLinkMonitoringRS-r17) is used as Aperipdic CSI-RS resource configuration information for RLM/BFD. That is, configuration information having a new IE parameter (eg, RadioLinkMonitoringRS-r17) is transmitted from the base station 10 to the terminal 20 as configuration information for Aperipdic CSI-RS resources for RLM/BFD.

RadioLinkMonitoringRS-r17 is set as Aperipdic CSI-RS setting information for RLM/BFD linked to CSI-AperiodicTriggerState. As a result, the terminal 20 triggered by the DCI can perform RLM/BFD measurements using the Aperipdic CSI-RS set by the RadioLinkMonitoringRS-r17, which is linked to the specified CSI-AperiodicTriggerState.

When Alt1 above is applied, Aperipdic CSI-RS for RLM/BFD linked to CSI-AperiodicTriggerState can also be used for existing applications. When Alt2 above is applied, RadioLinkMonitoringRS-r17 sets whether or not Aperipdic CSI-RS for RLM/BFD linked to CSI-AperiodicTriggerState can also be used for existing applications.

An example of RadioLinkMonitoringRS-r17 assuming Alt2 is shown in FIG. Specify whether the purpose of Aperipdic CSI-RS set in RadioLinkMonitoringRS-r17 is RLM (rlf in FIG. 14), BFR (beamFailure in FIG. 14), or both by the purpose shown in FIG. can be done.

<Example 3-2>
In Example 3-2, setting information extended from the existing setting information disclosed in Non-Patent Document 2 is used as setting information for CSI-AperiodicTriggerState. FIG. 15 shows CSI-AperiodicTriggerState-r17, which is an example of setting information of CSI-AperiodicTriggerState in Example 3-2.

As shown in FIG. 15, TriggeringPurpose is included. TriggeringPurpose indicates the purpose (application) of all Aperipdic CSI-RSs linked to this CSI-AperiodicTriggerState-r17. As TriggeringPurpose, RLM/BFD, existing purpose (CSI/beam report), etc. can be set. The example of FIG. 15 shows that subsets of purposes 1 to 7 described in the second embodiment can be set.

Assume that the terminal 20 in which setting information including the above CSI-AperiodicTriggerState-r17 is set is specified with a specific CSI-AperiodicTriggerState-r17 by the DCI CSI request field.

For example, when the terminal 20 determines that the purpose is RLM/BFD from the TriggeringPurpose in the CSI-AperiodicTriggerState-r17, it uses the Aperipdic CSI-RS associated with the CSI-AperiodicTriggerState-r17 to measure RLM/BFD. .

Also, for example, when the terminal 20 determines that the purpose is both RLM and CSI reporting from the TriggeringPurpose in the CSI-AperiodicTriggerState-r17, the Aperipdic CSI-RS associated with the CSI-AperiodicTriggerState-r17 is used for RLM measurement. It is also used for CSI reporting.

<Effect of Example 3-2>
In Example 3-2, Aperipdic CSI-RS for RLM/BFD can be realized while using the existing (Rel-16) Aperipdic CSI-RS report triggering procedure as it is.

<Example 3-3>
Next, Example 3-3 will be described. In Example 3-3, setting information of CSI-AperiodicTriggerState is expanded as in Example 3-2. More specifically, in Example 3-3, setting information extended from the existing setting information disclosed in Non-Patent Document 2 is used as setting information for reporting settings in CSI-AperiodicTriggerState.

FIG. 16 shows CSI-AperiodicTriggerState-r17, which is an example of CSI-AperiodicTriggerState in Example 3-3.

As shown in FIG. 16, TriggeringPurpose can be set for each CSI-AssociatedReportConfigInfo in the associatedReportConfigInfoList. TriggeringPurpose indicates the purpose (use) of Aperipdic CSI-RS linked to the corresponding CSI-AssociatedReportConfigInfo. As TriggeringPurpose, RLM/BFD, existing purpose (CSI/beam report), etc. can be set. The example of FIG. 16 shows that subsets of purposes 1 to 7 described in the second embodiment can be set.

For example, when the terminal 20 determines that the purpose is RLM/BFD from the TriggeringPurpose of a certain CSI-AssociatedReportConfigInfo in the CSI-AperiodicTriggerState-r17, the terminal 20 detects the measurement of the Aperipdic CSI-RSFDM linked to the CSI-AssociatedReportConfigInfo. use for

For example, when the terminal 20 determines from the TriggeringPurpose of a certain CSI-AssociatedReportConfigInfo in the CSI-AperiodicTriggerState-r17 that the purpose is both RLM and CSI reporting, the terminal 20 sets the Aperipdic measurement linked to the CSI-AssociatedReportConfigInfo to It is also used for CSI reporting measurements.

<Effects of Example 3-3>
In Example 3-3 as well, Aperipdic CSI-RS for RLM/BFD can be realized while using the existing (Rel-16) Aperipdic CSI-RS report triggering procedure as it is.

Also, in Example 3-3, purpose can be set for each of a plurality of different report settings in one CSI-AperiodicTriggerState. Therefore, for each of multiple different report settings in one CSI-Aperiodic TriggerState, the associated Aperipdic CSI-RS can be used for each purpose.

On the other hand, in Example 3-2, one purpose is set for one CSI-AperiodicTriggerState. That is, the same purpose is set for all reporting settings included in one CSI-AperiodicTriggerState. Therefore, all Aperipdic CSI-RSs associated with different multiple report settings in one CSI-Aperiodic TriggerState are used for the same purpose.

<Example 3-4>
Next, Example 3-4 will be described. In Example 3-4, setting information is expanded so that CSI-AperiodicTriggerStateList includes TriggerState for RLM/BFD. Also, a new structure is used as the structure of TriggerState.

Alt1 and Alt2 will be described as examples of the CSI-AperiodicTriggerStateList used in Example 3-4.

Alt1: Alt1 uses a CSI-AperiodicTriggerStateList containing only the new CSI-AperiodicTriggerState for RLM/BFD. FIG. 17 shows an example of CSI-AperiodicTriggerStateList of Alt1. As shown in FIG. 17, Alt1's CSI-AperiodicTriggerStateList contains only CSI-AperiodicTriggerStateRlm-r17, which is a new CSI-AperiodicTriggerState for RLM/BFD.

At Alt1, for example, the terminal 20 determines whether to use the existing CSI-AperiodicTriggerStateList or the new CSI-AperiodicTriggerStateList based on the DCI received as the Aperipdic CSI-RS trigger. For example, the DCI may include instruction information indicating whether to use the existing CSI-AperiodicTriggerStateList or the new CSI-AperiodicTriggerStateList, and the terminal 20 may make a decision based on the instruction information.

Also, for example, indicating that the interpretation of the value of the CSI request field of DCI is different from the conventional interpretation, for example, if the value of the CSI request field of DCI is greater than or equal to a certain value, a new CSI-Aperiodic Trigger StateList is used, Otherwise, it may indicate that the existing CSI-AperiodicTriggerStateList is used.

Alt2: Alt12 uses CSI-AperiodicTriggerStateList, which includes CSI-AperiodicTriggerState for existing purposes (CSI reporting, etc.) and new CSI-AperiodicTriggerState for RLM/BFD. FIG. 18 shows an example of CSI-AperiodicTriggerStateList of Alt2. As shown in FIG. 18, Alt1's CSI-AperiodicTriggerStateList includes an existing CSI-AperiodicTriggerState and a new CSI-AperiodicTriggerState for RLM/BFD, CSI-AperiodicTriggerStateRlm-r17.

An existing DCI can be used as the trigger DCI in Alt2. The terminal 20 uses the existing CSI-AperiodicTriggerState or CSI-AperiodicTriggerStateRlm-r17 according to the CSI request field of the DCI received from the base station 10 .

<Regarding CSI-AperiodicTriggerState in Example 3-4>
The new CSI-AperiodicTriggerState for RLM/BFD in Example 3-4 may contain a list of Aperipdic CSI-RS resources for RLM/BFD without containing information related to reporting. Examples 1 and 2 are shown below as structural examples of CSI-AperiodicTriggerStateRlm-r17, which is a new CSI-AperiodicTriggerState for RLM/BFD.

Example 1: FIG. 19 shows CSI-AperiodicTriggerStateRlm-r17 of Example 1. In Example 1, each CSI-AperiodicTriggerStateRlm-r17 is associated with a list of Aperipdic CSI-RS resources for RLM/BFD.

In the example of FIG. 19, RadioLinkMonitoringRS-r17 corresponds to the list. Example 1 is also an example of Example 3-1. As the RadioLinkMonitoringRS-r17 shown in FIG. 19, for example, the one shown in FIG. 14 of Example 3-1 can be used.

Example 2: FIG. 20 shows CSI-AperiodicTriggerStateRlm-r17 of Example 2. In Example 2, each CSI-AperiodicTriggerStateRlm-r17 is associated with a list of Aperipdic CSI-RS resources for RLM/BFD.

In the example of FIG. 20, the list indicated by NZP-CSI-RS-ResourceId corresponds to the list. The purpose of Aperipdic CSI-RS resources for RLM/BFD can be set commonly for a set of Aperipdic CSI-RS resource lists (using Purpose Common), or set for individual Aperipdic CSI-RS resource lists (using PurposeSeparate).

<Effect of Example 3-4>
According to Example 3-4, separate CSI-AperiodicTriggerStates can be used for RLM/BFD and for legacy purposes (such as CSI reporting).

(Example 4)
Next, Example 4 will be described. Example 4 is an example of new beam selection in BFR. In other words, Example 4 is an example that enables the terminal 20 to perform measurement using Aperiodic CSI-RS for the purpose of selecting a new beam in BFR.

The techniques described in Examples 2 and 3 can be applied to enable the terminal 20 to perform measurements using Aperiodic CSI-RS for the purpose of new beam selection in BFR. That is, the fourth embodiment is obtained by replacing "RLM/BFD" with "new beam selection" in the contents described in the second and third embodiments. More specifically, it is as described in Examples 4-1 and 4-2 below.

<Example 4-1>
Example 4-1 corresponds to Example 2. That is, the extension of DCI allows terminal 20 to make measurements with Aperiodic CSI-RS for the purpose of new beam selection in BFR. Example 4-1 is obtained by replacing "RLM/BFD" in Example 2 with "new beam selection".

<Example 4-2>
Example 4-2 corresponds to Example 3. That is, the extension of the RRC configuration information enables the terminal 20 to perform measurements by Aperiodic CSI-RS for the purpose of new beam selection in BFR. Basically, Example 4-2 is obtained by replacing "RLM/BFD" in Example 3 with "new beam selection".

As a more specific example, FIG. 21 shows an example of setting information used in Example 4-2 for Example 3-1. As shown in FIG. 21, candidateBeamRSList-r17, which is a list of beams detected by Aperiodic CSI-RS measurement, is set. Individual Aperiodic CSI-RS resources in candidateBeamRSList-r17 are set by PRACH-A-CSI-ResourceDedicatedBFR-r1.

In Example 4-2 for Example 3-1, the terminal 20 detects a new beam by measuring the Aperiodic CSI-RS specified by candidateBeamRSList-r17 linked to the triggering state specified by DCI.

As for Examples 3-2 to 3-4, Example 4-2 is obtained by replacing "RLM/BFD" as the purpose with "new beam selection" in Examples 3-2 to 3-4. Also, a correspondence relationship between Aperiodic CSI-RS resources that can be used in new beam selection and PRACH resources may be set.

(Modification)
Next, an example that can be applied to any of the first to fourth embodiments will be described as a modified example.

<Modification 1>
A relationship may be established between the beams of Aperiodic CSI-RS triggered for RLM/BFR and the beams used during LBT sensing. The relationship may be defined in specifications, or may be set from the base station 10 to the terminal 20 . Examples of such relationships include Examples 1 to 3 below.

Example 1: The Aperiodic CSI-RS beam triggered for RLM/BFR and the beam used for LBT sensing have the same direction and width (thickness).

Example 2: The Aperiodic CSI-RS beam triggered for RLM/BFR and the beam used for LBT sensing shall have the same direction and different widths. For example, make the beam width of Aperiodic CSI-RS narrower than the beam width used for LBT sensing.

Example 3: The Aperiodic CSI-RS beam triggered for RLM/BFR and the beam used for LBT sensing shall have different directions and different widths. For example, the space defined by the direction and width of the Aperiodic CSI-RS beam is included in the space defined by the direction and width of the beam used for LBT sensing corresponding to COT.

<Modification 2>
Each example in Examples 1 to 4 may be applied when the base station 10 and the terminal 20 use frequencies in a specific frequency range. A particular frequency range may be 52.6-71 GHz.

<Modification 3>
Each embodiment in Examples 1-4 may be applied when certain conditions are met. For example, whether or not the operation of using Aperiodic CSI-RS for RLM/BFR may be determined depending on whether the LBT operation is ON or OFF, or whether the band to be used is an unlicensed band or a licensed band.

For example, when the LBT operation is ON (or when the band to be used is the unlicensed band), the base station 10 transmits the DCI described in the second embodiment, and the Aperiodic CSI-RS is transmitted to the terminal 20 by RLM/ It may be used by the BFR.

In addition, when the LBT operation is ON (or when the band to be used is the unlicensed band), the base station 10 performs the RRC setting described in the third embodiment, so that the terminal 20 receives Aperiodic CSI-RS as RLM/BFR may be used for

<Modification 4>
Example 2 (DCI extension) and Example 3 (RRC extension) may be combined and implemented. The same applies to Example 4 corresponding to Example 2 (DCI extension) and Example 3 (RRC extension).

<Modification 5>
For each of the examples described in Examples 1-4, whether or not terminal 20 uses it may be set/indicated/reported, etc., according to Examples 1-4 below.

Example 1: Settings are made to the terminal 20 using upper layer parameters (eg RRC, MAC CE).

Example 2: Report from terminal 20 to base station 10 by UE capability.

Example 3: Stipulated in the specifications.

Example 4: Determined by setting by higher layer parameters and reported UE capabilities (combination of example 1 and example 2).

<Modification 6>
Modification 6 is an example of UE capability. UE capabilities shown in Examples 1 to 8 below are defined, and any of the UE capabilities may be reported from the terminal 20 to the base station 10 . This operation corresponds to the operation of S100 in FIG.

Example 1: UE capability indicating whether terminal 20 supports Aperiodic CSI-RS for RLM/BFR.

Example 2: UE capability indicating whether the terminal 20 supports only Aperiodic CSI-RS for RLM/BFR.

Example 3: UE capability indicating whether the terminal 20 supports Periodic CSI-RS in addition to Aperiodic CSI-RS for RLM/BFR.

Example 4: UE capability indicating whether the terminal 20 supports a new DCI format that triggers Aperiodic CSI-RS for RLM/BFR.

Example 5: UE capability indicating whether terminal 20 supports existing DCI format with new RNTI to trigger Aperiodic CSI-RS for RLM/BFR.

Example 6: UE capability indicating whether terminal 20 supports existing DCI format with existing RNTI to trigger Aperiodic CSI-RS for RLM/BFR.

Example 7: UE capability indicating whether or not the terminal 20 supports Aperiodic CSI-RS for RLM/BFR measurement purposes in addition to existing purposes (eg beam/CSI reporting, tracking).

Example 8: UE capability indicating whether or not the terminal 20 supports RRC configuration information for determining for which purpose the Aperiodic CSI-RS is to be used.

The technology according to the present embodiment described above provides a technology that enables a terminal to appropriately perform failure detection and recovery in a wireless communication system.

(Device configuration)
Next, functional configuration examples of the base station 10 and the terminal 20 that execute the processes and operations described above will be described.

<Base station 10>
FIG. 22 is a diagram showing an example of the functional configuration of the base station 10. As shown in FIG. As shown in FIG. 22, the base station 10 has a transmitting section 110, a receiving section 120, a setting section 130, and a control section 140. The functional configuration shown in FIG. 22 is merely an example. As long as the operation according to the embodiment of the present invention can be executed, the functional division and the names of the functional units may be arbitrary. Also, the transmitting unit 110 and the receiving unit 120 may be collectively referred to as a communication unit.

The transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and wirelessly transmitting the signal. The receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, higher layer information from the received signals. Further, the transmission section 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL/UL control signals, DCI by PDCCH, data by PDSCH, and the like to the terminal 20 .

The setting unit 130 stores preset setting information and various types of setting information to be transmitted to the terminal 20 in a storage device included in the setting unit 130, and reads them from the storage device as necessary.

The control unit 140 schedules DL reception or UL transmission of the terminal 20 via the transmission unit 110 . Also, the control unit 140 includes a function of performing LBT. A functional unit related to signal transmission in control unit 140 may be included in transmitting unit 110 , and a functional unit related to signal reception in control unit 140 may be included in receiving unit 120 . Also, the transmitter 110 may be called a transmitter, and the receiver 120 may be called a receiver.

<Terminal 20>
FIG. 23 is a diagram showing an example of the functional configuration of the terminal 20. As shown in FIG. As shown in FIG. 23 , the terminal 20 has a transmitter 210 , a receiver 220 , a setter 230 and a controller 240 . The functional configuration shown in FIG. 12 is merely an example. As long as the operation according to the embodiment of the present invention can be executed, the functional division and the names of the functional units may be arbitrary. The transmitting unit 210 and the receiving unit 220 may be collectively referred to as a communication unit.

The transmission unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal. The receiving unit 220 wirelessly receives various signals and acquires a higher layer signal from the received physical layer signal. The receiving unit 220 also has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL/UL/SL control signals, DCI by PDCCH, data by PDSCH, and the like transmitted from the base station 10 . In addition, for example, the transmission unit 210, as D2D communication, to the other terminal 20, PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Channel) etc., and the receiving unit 120 may receive PSCCH, PSSCH, PSDCH, PSBCH, or the like from another terminal 20 .

The setting unit 230 stores various types of setting information received from the base station 10 or other terminals by the receiving unit 220 in the storage device provided in the setting unit 230, and reads them from the storage device as necessary. The setting unit 230 also stores preset setting information. The control unit 240 controls the terminal 20 . Also, the control unit 240 includes a function of performing LBT.

The terminals and base stations of this embodiment may be configured as the terminals and base stations shown in the following items. Also, the following measuring method may be implemented.

<Configuration for Examples 2 and 4>
(Section 1)
a receiving unit that receives downlink control information from a base station;
a control unit that performs measurements for radio link monitoring or beam failure recovery using aperiodic reference signals received from the base station, based on triggers based on the downlink control information.
(Section 2)
The downlink control information includes the purpose of the aperiodic reference signal,
2. The terminal according to claim 1, wherein the control unit determines, based on the purpose, that the aperiodic reference signal is a reference signal used for radio link monitoring or beam failure recovery.
(Section 3)
The control unit determines that the aperiodic reference signal is a reference signal used for radio link monitoring or beam failure recovery, based on the format of the downlink

control information Item

1 or 2 terminal described in .
(Section 4)
The control unit determines that the aperiodic reference signal is a reference signal used for radio link monitoring or beam failure recovery based on the RNTI used for scrambling the downlink control information. The terminal according to any one of items 1 to 3.
(Section 5)
A transmission unit that transmits downlink control information to the terminal,
The transmitting unit transmits an aperiodic reference signal based on a trigger by the downlink control information, and the terminal performs measurement for radio link monitoring or beam failure recovery using the aperiodic reference signal. base station.
(Section 6)
receiving downlink control information from a base station;
and measuring for radio link monitoring or beam failure recovery using an aperiodic reference signal received from the base station based on the trigger by the downlink control information.

Any of the above configurations provides a technology that enables a terminal to appropriately perform failure detection and recovery in a wireless communication system. According to the second term, the purpose can be explicitly grasped. According to

items

3 and 4, the terminal can grasp the purpose even if the purpose is not explicitly included.

<Configuration for Examples 3 and 4>
(Section 1)
a receiving unit that receives configuration information of an aperiodic reference signal used for radio link monitoring or beam failure recovery from a base station;
A terminal, comprising: a control unit that performs measurement for radio link monitoring or beam failure recovery using the aperiodic reference signal, based on a trigger based on downlink control information received from the base station.
(Section 2)
a receiver that receives configuration information including the purpose of the aperiodic reference signal from the base station;
Based on the trigger by the downlink control information received from the base station, control to perform measurement for radio link monitoring or beam failure recovery using an aperiodic reference signal specified by the configuration information according to the purpose. A terminal comprising a part and .
(Section 3)
3. The terminal according to claim 2, wherein the purpose is included in each triggering state in the configuration information.
(Section 4)
The configuration information has a list of triggering states,
All triggering states in the list are information specifying aperiodic reference signals for radio link monitoring or beam failure recovery, or
A part of triggering states among all triggering states in the list is information designating an aperiodic reference signal for radio link monitoring or beam failure recovery. terminal.
(Section 5)
A transmitting unit configured to transmit configuration information including the purpose of the aperiodic reference signal to the terminal;
The transmitting unit transmits downlink control information, and in the terminal, radio link monitoring is performed by an aperiodic reference signal specified by the configuration information according to the purpose based on a trigger by the downlink control information. or the base station where measurements are made for beam failure recovery.
(Section 6)
receiving configuration information from a base station including the purpose of the aperiodic reference signal;
A step of performing measurements for radio link monitoring or beam failure recovery using an aperiodic reference signal specified by the configuration information according to the purpose, based on a trigger by downlink control information received from the base station. A terminal-performed measurement method comprising and .

Any of the above configurations provides a technology that enables a terminal to appropriately perform failure detection and recovery in a wireless communication system. According to the third term, a purpose can be set in each triggering state. According to the fourth item, variations of the triggering state list can be realized.

(Hardware configuration)
The block diagrams (FIGS. 22 and 23) used to describe the above embodiments show blocks in functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of implementing each functional block is not particularly limited. That is, each functional block may be implemented using one device that is physically or logically coupled, or directly or indirectly using two or more devices that are physically or logically separated (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices. A functional block may be implemented by combining software in the one device or the plurality of devices.

Functions include judging, determining, determining, calculating, calculating, processing, deriving, investigating, searching, checking, receiving, transmitting, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, assuming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. can't For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. In either case, as described above, the implementation method is not particularly limited.

For example, the base station 10, the terminal 20, etc. according to the embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. FIG. 24 is a diagram illustrating an example of a hardware configuration of base station 10 and terminal 20 according to an embodiment of the present disclosure. The base station 10 and terminal 20 described above are physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. good too.

In the following explanation, the term "apparatus" can be read as a circuit, device, unit, or the like. The hardware configuration of the base station 10 and terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.

Each function of the base station 10 and the terminal 20 is performed by the processor 1001 performing calculations and controlling communication by the communication device 1004 by loading predetermined software (programs) onto hardware such as the processor 1001 and the storage device 1002. or by controlling at least one of data reading and writing in the storage device 1002 and the auxiliary storage device 1003 .

The processor 1001, for example, operates an operating system and controls the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, the control unit 140 , the control unit 240 and the like described above may be implemented by the processor 1001 .

In addition, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes according to them. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. For example, control unit 140 of base station 10 shown in FIG. 22 may be implemented by a control program stored in storage device 1002 and operated by processor 1001 . Also, for example, the control unit 240 of the terminal 20 shown in FIG. 23 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001 . Although it has been explained that the above-described various processes are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. FIG. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via an electric communication line.

The storage device 1002 is a computer-readable recording medium, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. may be configured. The storage device 1002 may also be called a register, cache, main memory (main storage device), or the like. The storage device 1002 can store executable programs (program code), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

The auxiliary storage device 1003 is a computer-readable recording medium, for example, an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disc, a magneto-optical disc (for example, a compact disc, a digital versatile disc, a Blu -ray disk), smart card, flash memory (eg, card, stick, key drive), floppy disk, magnetic strip, and/or the like. The storage medium described above may be, for example, a database, server, or other suitable medium including at least one of storage device 1002 and secondary storage device 1003 .

The communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of, for example, frequency division duplex (FDD) and time division duplex (TDD). may consist of For example, a transmitting/receiving antenna, an amplifier section, a transmitting/receiving section, a transmission path interface, etc. may be implemented by the communication device 1004 . The transceiver may be physically or logically separate implementations for the transmitter and receiver.

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

Each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between devices.

In addition, the base station 10 and the terminal 20 include microprocessors, digital signal processors (DSPs), ASICs (Application Specific Integrated Circuits), PLDs (Programmable Logic Devices), FPGAs (Field Programmable Gates and other hardware arrays). , and part or all of each functional block may be implemented by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

(Supplement to the embodiment)
Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art can understand various modifications, modifications, alternatives, replacements, and the like. be. Although specific numerical examples have been used to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified. The division of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, and the items described in one item may be used in another item. may apply (unless inconsistent) to the matters set forth in Boundaries of functional or processing units in functional block diagrams do not necessarily correspond to boundaries of physical components. The operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components. As for the processing procedures described in the embodiments, the processing order may be changed as long as there is no contradiction. Although the base station 10 and the terminal 20 have been described using functional block diagrams for convenience of explanation of processing, such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to the embodiment of the present invention and the software operated by the processor of the terminal 20 according to the embodiment of the present invention are stored in random access memory (RAM), flash memory, read-only memory, respectively. (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other appropriate storage medium.

Also, notification of information is not limited to the aspects/embodiments described in the present disclosure, and may be performed using other methods. For example, notification of information includes physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof.Also, RRC signaling may be called an RRC message, for example, RRC It may be a connection setup (RRC Connection Setup) message, an RRC connection reconfiguration message, or the like.

Each aspect/embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark) )), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other suitable systems and extended It may be applied to at least one of the next generation systems. Also, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G, etc.).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this specification may be changed as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps using a sample order, and are not limited to the specific order presented.

A specific operation performed by the base station 10 in this specification may be performed by its upper node in some cases. In a network consisting of one or more network nodes with a base station 10, various operations performed for communication with the terminal 20 may be performed by the base station 10 and other network nodes other than the base station 10 ( (eg, but not limited to MME or S-GW). Although the case where there is one network node other than the base station 10 is illustrated above, the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW). .

Information, signals, etc. described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It may be input and output via multiple network nodes.

Input/output information may be stored in a specific location (for example, memory) or managed using a management table. Input/output information and the like can be overwritten, updated, or appended. The output information and the like may be deleted. The entered information and the like may be transmitted to another device.

The determination in the present disclosure may be performed by a value represented by 1 bit (0 or 1), may be performed by a boolean (Boolean: true or false), or may be a numerical comparison (for example , comparison with a predetermined value).

Software, whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

In addition, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, if the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.), the website, Wired and/or wireless technologies are included within the definition of transmission medium when sent from a server or other remote source.

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

The terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, the channel and/or symbols may be signaling. A signal may also be a message. A component carrier (CC) may also be called a carrier frequency, cell, frequency carrier, or the like.

The terms "system" and "network" used in this disclosure are used interchangeably.

In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. may be represented. For example, radio resources may be indexed.

The names used for the parameters described above are not restrictive names in any respect. Further, the formulas, etc., using these parameters may differ from those expressly disclosed in this disclosure. Since the various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are in no way restrictive names. is not.

In the present disclosure, "base station (BS)", "radio base station", "base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB ( gNB)", "access point", "transmission point", "reception point", "transmission/reception point", "cell", "sector", " Terms such as "cell group", "carrier", "component carrier" may be used interchangeably. A base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, and the like.

A base station can accommodate one or more (eg, three) cells. When a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being associated with a base station subsystem (e.g., an indoor small base station (RRH: The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base stations and base station subsystems serving communication services in this coverage. point to

In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" may be used interchangeably.

A mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

At least one of the base station and mobile station may be called a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like. The mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ). Note that at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

Also, the base station in the present disclosure may be read as a terminal. For example, a configuration in which communication between a base station and a terminal is replaced with communication between a plurality of terminals 20 (for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.) Each aspect/embodiment of the present disclosure may be applied to. In this case, the terminal 20 may have the functions of the base station 10 described above. Also, words such as "up" and "down" may be replaced with words corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may be read as side channels.

Similarly, a terminal in the present disclosure may be read as a base station. In this case, the base station may have the functions that the terminal has.

The terms "determining" and "determining" used in this disclosure may encompass a wide variety of actions. "Judgement" and "determination" are, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (eg, lookup in a table, database, or other data structure); Also, "judgment" and "determination" are used to refer to receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access (Accessing) (for example, accessing data in memory) may include deeming that a "judgment" or "decision" has been made. In addition, "judgment" and "decision" refer to resolving, selecting, choosing, establishing, comparing, etc. as "judgment" and "decision". can contain. In other words, "judgment" and "decision" may include considering that some action is "judgment" and "decision". Also, "judgment (decision)" may be read as "assuming", "expecting", "considering", or the like.

The terms "connected," "coupled," or any variation thereof, mean any direct or indirect connection or coupling between two or more elements, It can include the presence of one or more intermediate elements between two elements being "connected" or "coupled." Couplings or connections between elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in this disclosure, two elements are defined using at least one of one or more wires, cables, and printed electrical connections and, as some non-limiting and non-exhaustive examples, in the radio frequency domain. , electromagnetic energy having wavelengths in the microwave and optical (both visible and invisible) regions, and the like.

The reference signal can also be abbreviated as RS (Reference Signal), and may also be called Pilot depending on the applicable standard.

The term "based on" as 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."

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

"Means" in the configuration of each device described above may be replaced with "unit", "circuit", "device", or the like.

Where "include," "including," and variations thereof are used in this disclosure, these terms, like the term "comprising," are inclusive. is intended. Furthermore, the term "or" as used in this disclosure is not intended to be an exclusive OR.

A radio frame may consist of one or more frames in the time domain. Each frame or frames in the time domain may be referred to as a subframe. A subframe may also consist of one or more slots in the time domain. A subframe may be of a fixed length of time (eg, 1 ms) independent of numerology.

A numerology may be a communication parameter that applies to the transmission and/or reception of a signal or channel. Numerology, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI: Transmission Time Interval), number of symbols per TTI, radio frame configuration, transceiver It may indicate at least one of certain filtering operations performed in the frequency domain, certain windowing operations performed by the transceiver in the time domain, and/or the like.

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

A slot may contain multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist of fewer symbols than a slot. PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (or PUSCH) mapping type A. PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (or PUSCH) mapping type B.

Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations.

For example, one subframe may be called a Transmission Time Interval (TTI), a plurality of consecutive subframes may be called a TTI, and one slot or one minislot may be called a TTI. may That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms may be Note that the unit representing the TTI may be called a slot, mini-slot, or the like instead of a subframe. Also, one slot may be called a unit time. The unit time may differ from cell to cell depending on the neurology.

Here, TTI refers to, for example, the minimum scheduling time unit in wireless communication. For example, in the LTE system, the base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each terminal 20) to each terminal 20 on a TTI basis. Note that the definition of TTI is not limited to this.

A TTI may be a transmission time unit such as a channel-encoded data packet (transport block), code block, or codeword, or may be a processing unit such as scheduling and link adaptation. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.

When one slot or one minislot is called a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum scheduling time unit. Also, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, or the like. A TTI that is shorter than a normal TTI may also be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, and the like.

Note that the long TTI (e.g., normal TTI, subframe, etc.) may be replaced with a TTI having a time length exceeding 1 ms, and the short TTI (e.g., shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms A TTI having the above TTI length may be read instead.

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

Also, the time domain of an RB may include one or more symbols and may be 1 slot, 1 minislot, 1 subframe, or 1 TTI long. One TTI, one subframe, etc. may each consist of one or more resource blocks.

One or more RBs are physical resource blocks (PRB: Physical RB), sub-carrier groups (SCG: Sub-Carrier Group), resource element groups (REG: Resource Element Group), PRB pairs, RB pairs, etc. may be called.

Also, a resource block may be composed of one or more resource elements (RE: Resource Element). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

A bandwidth part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of contiguous common resource blocks (RBs) for a certain numerology in a certain carrier. Here, the common RB may be identified by an RB index based on the common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

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

At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

The structures such as radio frames, subframes, slots, minislots and symbols described above are only examples. For example, the number of subframes contained in a radio frame, the number of slots per subframe or radio frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, the number of Configurations such as the number of subcarriers, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, etc. can be varied.

In this disclosure, when articles are added by translation, such as a, an, and the in English, the disclosure may include that nouns following these articles are plural.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean that "A and B are different from C". Terms such as "separate," "coupled," etc. may also be interpreted in the same manner as "different."

Each aspect/embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching along with execution. In addition, the notification of predetermined information (for example, notification of “being X”) is not limited to being performed explicitly, but may be performed implicitly (for example, not notifying the predetermined information). good too.

Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be practiced with modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Accordingly, the description of the present disclosure is for illustrative purposes and is not meant to be limiting in any way.

10 base station 110 transmitting unit 120 receiving unit 130 setting unit 140 control unit 20 terminal 210 transmitting unit 220 receiving unit 230 setting unit 240 control unit 1001 processor 1002 storage device 1003 auxiliary storage device 1004 communication device 1005 input device 1006 output device

Claims

a receiving unit that receives configuration information of an aperiodic reference signal used for radio link monitoring or beam failure recovery from a base station;
A terminal, comprising: a control unit that performs measurement for radio link monitoring or beam failure recovery using the aperiodic reference signal, based on a trigger based on downlink control information received from the base station.
a receiver that receives configuration information including the purpose of the aperiodic reference signal from the base station;
Based on the trigger by the downlink control information received from the base station, control to perform measurement for radio link monitoring or beam failure recovery using an aperiodic reference signal specified by the configuration information according to the purpose. A terminal comprising a part and .
The terminal according to claim 2, wherein the purpose is included in each triggering state in the configuration information.
The configuration information has a list of triggering states,
All triggering states in the list are information specifying aperiodic reference signals for radio link monitoring or beam failure recovery, or
The terminal according to claim 2 or 3, wherein some triggering states among all triggering states in the list are information specifying aperiodic reference signals for radio link monitoring or beam failure recovery. .
A transmitting unit configured to transmit configuration information including the purpose of the aperiodic reference signal to the terminal;
The transmitting unit transmits downlink control information, and in the terminal, radio link monitoring is performed by an aperiodic reference signal specified by the configuration information according to the purpose based on a trigger by the downlink control information. or the base station where measurements are made for beam failure recovery.
receiving configuration information from a base station including the purpose of the aperiodic reference signal;
A step of performing measurements for radio link monitoring or beam failure recovery using an aperiodic reference signal specified by the configuration information according to the purpose, based on a trigger by downlink control information received from the base station. A terminal-performed measurement method comprising and .