CN117044279A

CN117044279A - Terminal, base station and measurement method

Info

Publication number: CN117044279A
Application number: CN202180096054.0A
Authority: CN
Inventors: 芝池尚哉; 原田浩树; 永田聪; 皮启平; 王静; 陈岚
Original assignee: NTT Docomo Inc
Current assignee: NTT Docomo Inc
Priority date: 2021-04-02
Filing date: 2021-04-02
Publication date: 2023-11-10
Also published as: WO2022208898A1

Abstract

A terminal, having: a receiving unit that receives, from a base station, setting information of an aperiodic reference signal used for radio link monitoring or beam failure recovery; and a control unit that performs measurement for radio link monitoring or beam fault recovery by the aperiodic reference signal according to a trigger based on the downlink control information received from the base station.

Description

Terminal, base station and measurement method

Technical Field

The present invention relates to a terminal, a base station, and a measurement method in a wireless communication system.

Background

In NR (New Radio: new air interface) which is a subsequent system of LTE (Long Term Evolution: long term evolution) (also referred to as "5G"), as a requirement, a technology satisfying a large-capacity system, a high data transmission rate, low delay, simultaneous connection of a plurality of terminals, low cost, power saving, and the like is being studied (for example, non-patent document 1). In NR, a technique using a high frequency band such as 52.6 to 114.25GH is being studied.

In the NR system, a band (also referred to as an unlicensed band), an unlicensed carrier (unlicensed carrier), and an unlicensed CC (unlicensed CC)) different from a band (licensed band) licensed by a communication carrier (operator) is supported for extension of the band.

Prior art literature

Non-patent literature

Non-patent document 1:3GPP TS 38.300V16.4.0 (2020-12)

Non-patent document 2:3GPP TS 38.331V16.3.0 (2020-12)

Non-patent document 3:3GPP TS 38.213V16.4.0 (2020-12)

Non-patent document 4:3GPP TS 38.321V16.3.0 (2020-12)

Non-patent document 5:3GPP TS 38.214V16.4.0 (2020-12)

Disclosure of Invention

Problems to be solved by the invention

Various functions relating to the failure detection of a radio link and the recovery thereof are specified in NR (for example, non-patent documents 2 to 5). Further, various functions concerning beam failure detection and recovery are also specified in NR (for example, non-patent documents 2 to 5).

However, a terminal conforming to the conventional NR assuming a frequency band up to 52.6GHz may not be able to properly perform failure detection and recovery of a radio link/beam in a high frequency band such as 52.6 to 114.25GH assuming use of an unlicensed band.

The present invention has been made in view of the above-described aspects, and an object thereof is to provide a technique by which a terminal can appropriately perform failure detection and recovery in a wireless communication system.

Means for solving the problems

According to the disclosed technology, there is provided a terminal having: a receiving unit that receives, from a base station, setting information of an aperiodic reference signal used for radio link monitoring or beam failure recovery; and a control unit that performs measurement for radio link monitoring or beam fault recovery by the aperiodic reference signal according to a trigger based on the downlink control information received from the base station.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the disclosed technology, a technology is provided in which a terminal can properly perform fault detection and recovery in a wireless communication system.

Drawings

Fig. 1 is a diagram for explaining a wireless communication system according to an embodiment of the present invention.

Fig. 2 is a diagram for explaining a wireless communication system in an embodiment of the present invention.

Fig. 3 is a diagram showing an example of a band.

Fig. 4 is a diagram showing the relationship between SCS and symbol length.

Fig. 5 is a diagram showing a basic process example in the embodiment of the present invention.

Fig. 6 is a diagram showing a procedure example of RLM/RLF.

Fig. 7 is a diagram for explaining the version 15 BFR.

Fig. 8 is a diagram for explaining the version 16 BFR.

Fig. 9 is a diagram showing an example of a specification book regarding RLM/BFD.

Fig. 10 is a diagram showing an example of a specification book regarding BFR.

Fig. 11 is a diagram for explaining a transmission state of CSI-RS/SSB in the case of LBT.

Fig. 12 is a diagram showing an example of the aperiodic CSI report triggering procedure (Aperiodic CSI report triggering procedure) of release 16;

fig. 13 is a diagram showing an example of a specification.

Fig. 14 is a diagram showing an example of a specification book in embodiment 3.

Fig. 15 is a diagram showing an example of a specification book in embodiment 3.

Fig. 16 is a diagram showing an example of a specification book in embodiment 3.

Fig. 17 is a diagram showing an example of setting information in embodiment 3.

Fig. 18 is a diagram showing an example of setting information in embodiment 3.

Fig. 19 is a diagram showing an example of a specification book in embodiment 3.

Fig. 20 is a diagram showing an example of a specification book in embodiment 3.

Fig. 21 is a diagram showing an example of a specification book in embodiment 4.

Fig. 22 is a diagram showing an example of the functional configuration of the base station 10 in the embodiment of the present invention.

Fig. 23 is a diagram showing an example of the functional configuration of the terminal 20 according to the embodiment of the present invention.

Fig. 24 is a diagram showing an example of a hardware configuration of the base station 10 or the terminal 20 according to the embodiment of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

In the operation of the wireless communication system according to the embodiment of the present invention, the conventional technology is appropriately used. This prior art is for example the existing LTE. The wireless communication system (base station 10 and terminal 20) in the present embodiment basically performs operations in accordance with conventional regulations (for example, non-patent documents 1 to 5). However, in order to solve the problem in the case of using a high-frequency band or an unlicensed band (unlicensed band), the base station 10 and the terminal 20 also perform operations not found in the conventional regulations. In the description of the embodiments described below, the operation not existing in the conventional specification will be mainly described. In addition, the numerical values described below are examples.

In the embodiment of the present invention, the Duplex (Duplex) scheme may be a TDD (Time Division Duplex: time division Duplex) scheme, an FDD (Frequency Division Duplex: frequency division Duplex) scheme, or a scheme other than this (for example, flexible Duplex) scheme.

In the embodiment of the present invention, the radio parameter "configured" may be a predetermined value set in advance (Pre-configuration), or may be a radio parameter notified from the base station 10 or the terminal 20.

In the embodiments described below, aperiodic CSI-RS is exemplified as a reference signal used in RLM/BFR, but the aperiodic reference signal to which the technique of the present invention can be applied is not limited to aperiodic CSI-RS. For example, as an aperiodic reference signal to which the technique of 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 architecture)

Fig. 1 is a diagram for explaining a wireless communication system according to an embodiment of the present invention. As shown in fig. 1, the wireless communication system in the embodiment of the present invention includes a base station 10 and a terminal 20. In fig. 1, 1 base station 10 and 1 terminal 20 are shown, but this is only an example, and a plurality of base stations and 1 terminal 20 may be used.

The base station 10 is a communication device that provides 1 or more cells and performs wireless communication with the terminal 20. The physical resources of the wireless signal are defined in the time and frequency domains.

OFDM is used as a radio access scheme. In the frequency domain, the subcarrier spacing (SCS: subCarrier Spacing) supports at least 15kHz, 30kHz, 120kHz, 240kHz. Furthermore, regardless of the SCS, the resource block is composed of a predetermined number (e.g., 12) of consecutive subcarriers.

When the terminal 20 performs initial access, it detects SSB (SS/PBCH block: SS/PBCH block), and identifies SCS in PDCCH and PDSCH based on PBCH included in SSB.

Further, in the time domain, a slot is constituted by a plurality of OFDM symbols (e.g., 14 regardless of subcarrier spacing). Hereinafter, the OFDM symbol is referred to as a "symbol". The time slot is a scheduling unit. Further, subframes of a 1ms section are defined, and a frame composed of 10 subframes is defined. In addition, the number of symbols per slot is not limited to 14.

As shown in fig. 1, a base station 10 transmits control information or data to a terminal 20 through DL (Downlink: uplink) and receives control information or data from the terminal 20 through UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to transmit and receive signals. In addition, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output: multiple input multiple output) based communication to DL or UL. The base station 10 and the terminal 20 may communicate with each other via an SCell (Secondary Cell) and a PCell (Primary Cell) based on CA (Carrier Aggregation: carrier aggregation).

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

The terminal 20 can perform carrier aggregation for bundling a plurality of cells (a plurality of CCs (component carriers)) and communicating with the base station 10. In carrier aggregation, 1 PCell (primary cell) and 1 or more scells (secondary cells) are used. In addition, PUCCH-SCell having PUCCH may be used.

Fig. 2 shows a configuration example of a wireless communication system in the case of performing NR-DC (NR-Dual connectivity: NR dual connectivity). As shown in fig. 2, there is a base station 10A as an MN (Master Node: master Node) and a base station 10B as an SN (Secondary Node). The base stations 10A and 10B are connected to a core network, respectively. The terminal 20 communicates with both the base station 10A and the base station 10B.

The cell group provided by the base station 10A as MN is referred to as MCG (Master Cell Group: primary cell group), and the cell group provided by the base station 10B as SN is referred to as SCG (Secondary Cell Group: secondary cell group). In DC, the MCG is composed of 1 PCell and 1 or more scells, and the SCG is composed of 1 PSCell (Primary SCell: primary SCell) and 1 or more scells. In this specification, CC (component carrier) and cell may be used synonymously. The PCell and PSCell may also be referred to as an SPcell.

In the wireless communication system of the present embodiment, LBT (Listen Before Talk: listen before talk) is performed in the case of using an unlicensed band. The base station 10 or the terminal 20 listens for a signal, transmits when the listening result is idle, and does not transmit when the listening result is busy. In addition, LBT may not be necessarily performed in an unauthorized band, and LBT may not be performed in an unauthorized band.

(regarding frequency bands)

Fig. 3 shows an example of a frequency band used in the conventional NR and a frequency band used in the wireless communication system according to the present embodiment. 2 bands having FR1 (0.41 GHz to 7.125) and FR2 (24.25 GHz to 52.6 GHz) are used as bands (may also be referred to as frequency ranges) in the conventional NR. As shown in fig. 3, in FR1, 15kHz, 30kHz, 60kHz are supported as SCS, and 5 to 100MHz is supported as Bandwidth (BW). In FR2, 60kHz, 120kHz, 240kHz (SSB only) are supported as SCS, and 50-400 MHz is supported as Bandwidth (BW).

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

In the present embodiment, it is assumed that SCS having a wider bandwidth than the conventional SCS is used as the bandwidth is extended as described above. For example, 480kHz or SCS wider than 480kHz is used as SCS of SSB and PDCCH/PDSCH.

In the high frequency band, in order to compensate for large propagation losses, it is envisaged to use a plurality of narrow beams. Further, as the SCS, SCS wider than that of the conventional FR2 was used (for example, 480kHz, 960 kHz).

Fig. 4 is a diagram showing a relationship between SCS and symbol length (time length of symbol). As shown in fig. 4, when the SCS becomes wider, the symbol length (time length of symbol) becomes shorter. In addition, assuming that the number of symbols per 1 slot is constant (i.e., 14 symbols), the slot length becomes shorter when the SCS becomes wider.

As described above, if the number of beams is reduced and the SCS is increased, if the terminal 20 and the base station 10 operate in accordance with the conventional specifications, the failure detection and recovery of the radio link and the beams may not be properly performed. For example, as will be described later, it is also assumed that LBT failure is frequently performed, and in this case, there is a possibility that measurement of a reference signal for failure detection and recovery of a radio link/beam cannot be properly performed.

Hereinafter, a technique for properly performing failure detection and recovery of a radio link/beam by the terminal 20 and the base station 10 will be described.

(basic action)

First, a basic operation example in the wireless communication system according to the present embodiment will be described with reference to fig. 5. In the present embodiment, since aperiodic CSI-RS that are transmitted from base station 10 and received (and measured) at terminal 20 are implemented using a trigger by DCI, a basic operation example related to the aperiodic CSI-RS will be described first.

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

In S101, the base station 10 transmits setting information to the terminal 20 by an RRC message, and the terminal 20 receives the setting information. The setting information is, for example, setting information related to aperiodic CSI-RS as described below.

In S102, the base station 10 transmits a trigger to the terminal 20 through DCI, and the terminal 20 receives the trigger. The trigger is, for example, a trigger for measurement of the aperiodic CSI-RS by the terminal 10 for RLM/BFR, which will be described later. In the present embodiment, "a/B" means a or B, or both a and B. In addition, "BFR" refers to "BFD/new beam selection".

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

As an example of actions using CSI-RS, RLM/RLF and BFR are explained. The operation based on the prior art disclosed in non-patent documents 1 to 5 and the like will be described.

(RLM/RLF)

First, RLM/RLF will be described. The terminal 20 (and the base station 10) performs RLM (Radio Link Monitoring: radio link monitoring), and when RLF (Radio Link Failure: radio link failure) is detected, RRC connection reestablishment (RRC connection re-neighbor) or the like is performed.

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

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

T310 starts by the trigger described above and stops when N311 consecutive in-sync indications are notified. When T310 expires, RRC connection reestablishment (RRC connection re-establischent) is performed, for example. T311 starts when the RRC connection reestablishment procedure in cell reselection starts and stops when cell reselection is successful. When T311 expires, terminal 20 enters an RRC idle state.

An example of the procedure of RLM in the terminal 20 is described with reference to fig. 6. In the terminal 20, when the lower layer (e.g., a functional part of the physical layer) detects out-of-sync (radio link quality degradation), the higher layer (e.g., a functional part of the RRC) is notified of out-of-sync indication.

The terminal 20 starts a timer T310 when it detects that N310 consecutive out-of-sync indications are notified from the lower layer to the upper layer. When the terminal 20 detects that N311 consecutive in-sync indications (radio link normal notification) are notified from the lower layer to the higher layer in the timer T310 operation, T310 is stopped. When T310 expires, it is determined that RLF has occurred, and an RRC connection reestablishment procedure is performed.

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

"upon request from higher layers, the UE provides to higher layers periodic CSI-RS configuration indexes from sets Q1-and/or SS/PBCH block indexes and Q greater than or equal to _in Corresponding radio link quality measurements (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 q 1-and the corresponding radio link quality measurements that are larger than or equal to Q) _in )”

That is, the in-sync indication is given a certain threshold Q _in The above index of the P-CSI-RS of the radio quality measurement value or (or "sum") index of the SS/PBCH block (hereinafter, may be referred to as SSB). The index of the P-CSI-RS and the index of the SSB of the object are indexes in the set of "q1 to" respectively. q1 to q are parameters to be notified from the base station 10 to the terminal 20 by RRC signaling through, for example, candidatebeam rslist for radio link quality measurement. The radio link quality may be RSRP or RSRQ.

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

"when the radio link quality for all corresponding resource configurations of the set Q0-Q for evaluating the radio link quality for the UE is worse than the threshold Q _out When the PHY in the UE provides an indication to higher layers (PHY in the UE provides an indication to higher layers when the radio link quality for all corresponding resource configurations in the set q 0-that the UE uses to assess the radio link quality is worse than the threshold Q _out )”

That is, out-of-sync indication is the radio link quality ratio of all resources in the sets "Q0 to" used by the terminal 20 for radio link quality evaluation to a certain threshold value Q _out And information notified in the case of a difference. q0 to q is, for example, a set of indexes of the P-CSI-RS that are notified from the base station 10 to the terminal 20 through RRC signaling by failuredetection resources.

(BFD/BFR)

Next, BFD/BFR will be described. Here, a technique of detecting a failure (BFD) of a beam and performing recovery (BFR) of the beam is described. First, a basic operation example of BFD/BFR according to the present embodiment will be described with reference to fig. 7 and 8.

First, an example of the operation of BFD/BFR in PCell/PSCell (BFR of release 15) will be described with reference to fig. 7.

In S10, the terminal 20 receives reference signals (CSI-RS, SSB, or both CSI-RS and SSB) transmitted from the base station 10 for each beam, and measures the quality (RSRP, RSRQ, etc.). Here, if it is determined that the number of times the quality of all the reference signals (i.e., beams) has been deteriorated reaches the predetermined number of times, the terminal 20 performs the search for a new beam at S11.

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

In S11, the terminal 20 measures L1-RSRP of a reference signal (called q 1) as a candidate (candidatebeam rslist set from the base station 10), and selects a reference signal (beam) for which L1-RSRP is the largest as a new beam.

In S12, the terminal 12 transmits PRACH (preamble) with PRACH timing (PRACH occision) corresponding to the selected new beam. The terminal 20 monitors a BFR response (PDCCH) in a BFR resource window (BFR response window) that begins 4 slots later.

After receiving (PDCCH of) the BFR response in S13, the terminal 20 assumes that the PDCCH monitored in coreset#0 is in QCL relation with the new beam (reference signal), and monitors the PDCCH in coreset#0.

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

In S21, the terminal 20 receives reference signals (CSI-RS, SSB, or both CSI-RS and SSB) transmitted from the base station 30 for each beam, and measures the quality (RSRP, RSRQ, etc.). Here, if it is determined that the number of times the quality of all the reference signals (i.e., beams) has been degraded reaches the predetermined threshold, the terminal 20 transmits an SR (scheduling request) in S21. In S23, a new beam is searched.

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

In S23, the terminal 20 measures L1-RSRP of a candidate reference signal (candidatebeam rslist, referred to as q 1) set from the base station 10, and selects a reference signal (beam) for which L1-RSRP is the largest as a new beam.

In S22, the terminal 20 receives the UL-grant and transmits the MAC CE in S24 using the resources allocated thereto. The MAC CE includes an index of CCs in which a beam failure exists and an index of a new reference signal (i.e., an index of a beam) for each CC. The terminal 20 receives a BFR response (PDCCH) in S25.

After receiving 28 symbols from the PDCCH (PDCCH of S25) for scheduling PUSCH, the terminal 20 assumes that the PDCCH monitored in the SCell thereafter is in QCL relation with a new beam (reference signal), and monitors the PDCCH. After the above 28 symbols, the terminal 20 uses a spatial domain filter corresponding to the spatial domain filter of the new beam (reference signal) to transmit PUSCH transmitted in the SCell thereafter. That is, QCL is also updated for PUSCH.

(setting information on reference Signal, etc.)

Fig. 9 shows an example of setting information related to RLM/BFD (non-patent document 2). As shown in fig. 9, the purpose, resource, and the like of the reference signal can be set by the radio link monitor. Fig. 10 shows an example of setting information related to BFR (non-patent document 2).

(regarding the utilization of aperiodic reference signals)

Since unlicensed spectrum (unlicensed band) is included in the frequency band of 52.6GHz to 71GHz that is assumed to be used in the wireless communication system according to the present embodiment, LBT may be required in the wireless communication system according to the present embodiment.

In the RLM and BFR based on the prior art described above, the terminal 20 receives reference signals (CSI-RS, SSB or CSI-RS and SSB) periodically transmitted from the base station 10, and performs quality measurement.

However, when LBT is performed in the base station 10, for example, as shown in fig. 11, there are cases where LBT is successful and cases where LBT is unsuccessful at each transmission timing of the reference signal. Therefore, it is assumed that the reference signal cannot be periodically transmitted from the base station 10, and the frequency of the reception of the reference signal in the terminal 20 becomes low. Therefore, RLM, BFR may not be properly performed.

In order to solve the above problem, as a reference signal used for beam monitoring and selection in RLM or BFR by the terminal 20, a reference signal having no periodicity is used, and a reference signal having no periodicity based on DCI triggering is used. The aperiodic reference signal is, for example, an aperiodic CSI-RS.

For example, in the case where the terminal 20 and the base station 10 use an unlicensed band (or in the case of LBT), the base station 10 transmits a reference signal at timing when LBT is successful.

The terminal 20 performs RLM, BFR by measuring reference signals received based on triggers instead of periodically, for example, performing the counting process described in fig. 6, 7, 8, etc. Thus, in case that LBT is required, RLF, BFR can be properly performed without being affected by LBT failure. The technique of the present invention can be applied without assuming LBT.

(aperiodic CSI reporting trigger (Aperiodic CSI report triggering))

Here, setting information and the like of aperiodic CSI report trigger based on the related art (non-patent documents 2 and 5 and the like) will be described with reference to fig. 12.

To implement the aperiodic CSI report trigger (Aperiodic CSI report triggering), first, CSI-apeeriodics triggerstatelist is set from the base station 10 to the terminal 20 through RRC. The CSI-apiodictriggerstatelist contains more than 1 CSI-apiodictriggerstate with an index added.

Then, the CSI request field (CSI requ) of the DCI transmitted from the base station 10 to the terminal 20est field), designates one CSI-apeeriodicttriggerstate in the CSI-apeeriodicttriggerstatelist. In addition, the bit number (N _TS ) The MAC CE is also used when the set CSI-apersidiodctriggerstates can be specified to be shorter than the entire set CSI-apersidiodconstates.

1 CSI-apeeriodics triggerstate is associated with more than 1 Report setting (reporting setting), and a Report setting is associated with more than 1 Resource setting (Resource setting). One resource setting contains more than one CSI-RS resource set (CSI-RS resource set). One CSI-RS resource set contains more than one CSI-RSresource (CSI-RS resource). That is, the terminal 20 can perform reception of CSI-RS through one or more CSI-RS resources associated with the CSI-apeeriodicdigerstate specified by the CSI request field.

Fig. 13 shows an example of CSI-apeeriodicttriggerstatelist (non-patent document 2). As shown in fig. 13, CSI-AperiodicTriggerState, CSI-apeeriodictriggerstate containing 1 or more CSI-apeeriodictriggerstatelist contains 1 or more resourceSet. The resourceSet represents NZP-CSI-RS-resourceSet for channel measurement.

(detailed problems)

In order to properly perform RLM/BFR even in the case where LBT failure occurs, whether or not to apply periodic CSI-RS/SSB to RLM/BFR and how to trigger aperiodic CSI-RS to RLM/BFR becomes an issue in the case where aperiodic CSI-RS are applied to RLM/BFR.

That is, when the existing aperiodic CSI reporting trigger (Aperiodic CSI report triggering) is directly applied, the triggered CSI-RS is used for CSI/beam reporting or tracking according to the reportquality. Thus, in order to support aperiodic CSI-RS for RLM/BFR, it is necessary to inform the terminal 20 of what purpose the triggered aperiodic CSI-RS is used for (CSI/beam reporting, tracking, or RLM/BFR).

Therefore, in the present embodiment, an extension of DCI for triggering and an extension of RRC setting are proposed. Details will be described later.

In addition, as a method of supporting aperiodic CSI-RS triggering for RLM/BFR, alt1 and Alt2 described below may be considered, but in the present embodiment, alt1 is employed in consideration of influence on specifications.

Alt1: as a baseline, release 16 aperiodic CSI report triggering procedure is re-utilized and extended.

Alt2: a new procedure is designed to support aperiodic CSI-RS triggering for RLM/BFR.

Examples 1 to 4 and modifications will be described below with respect to specific examples of the present embodiment. Any or all of embodiments 1-4 may be implemented in combination.

Example 1

Embodiment 1 is an embodiment based on the following point of view: for measurement in RLM/BFR, either only aperiodic CSI-RS is used or periodic CSI-RS is also used together with aperiodic CSI-RS. Examples 1-1, 1-2 and 1-3 are described below.

< examples 1 to 1>

In example 1-1, measurements in RLM/BFR were made using only aperiodic CSI-RS. In this case, there are variations (changes) of Alt1 and Alt2 described below for selection of a beam applied to the aperiodic CSI-RS.

Alt1: the aperiodic CSI-RS beam used is assumed to be the same as the beam set by CORESET.

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

Alt2: no limitation is made to the aperiodic CSI-RS beam used.

< examples 1 to 2>

In embodiments 1-2, both aperiodic CSI-RS and periodic CSI-RS/SSB may be used for RLM/BFR. That is, the existing periodic CSI-RS/SSB may be used for RLM/BFR in addition to the existing uses such as CSI/beam reporting, and further, aperiodic CSI-RS may be used for RLM/BFR.

For the selection of beams applied to aperiodic CSI-RS in embodiments 1-2, there are the following changes in Alt1 and Alt 2.

Alt1: the beams of the aperiodic CSI-RS used in RLM/BFR are assumed to be the same as the beams set for the periodic CSI-RS also used in RLM/BFR. The situation is as follows: it is contemplated to use aperiodic CSI-RS as an aid to periods during which periodic CSI-RS are not transmitted.

In this case, for example, information indicating the same beam as the beam set in the periodic CSI-RS is set from the base station 10 to the terminal 20 as setting information (for example, TCI state) on the beam of the aperiodic CSI-RS.

Alt2: it is assumed that the beam of the aperiodic CSI-RS used in RLM/BFR is the same as the beam set by CORESET.

The beam of the aperiodic CSI-RS may be the same as or different from the beam of the periodic CSI-RS set for BFD. Further, more PDCCH beams may also be envisaged in BFD.

Alt3: the aperiodic CSI-RS beam used in RLM/BFR is not limited.

< examples 1 to 3>

In embodiments 1-3, whether aperiodic or periodic CSI-RS is used for RLM/BFR is selected depending on the conditions.

For example, when LBT is required for signal transmission, the base station 10 determines to use aperiodic CSI-RS for RLM/BFR, and performs an operation (based on DCI or RRC settings described below) of using aperiodic CSI-RS for RLM/BFR by the terminal 20.

In the case of using a carrier of a specific band (for example, an unlicensed band), the base station 10 may determine to use an aperiodic CSI-RS for RLM/BFR and perform an operation of using the aperiodic CSI-RS by the terminal 20 for RLM/BFR.

In addition, the same embodiment (embodiment 1-1, embodiment 1-2, or embodiment 1-3) may be applied to RLM and BFR, or different embodiments may be applied to RLM and BFR.

Example 2

Next, example 2 is described. In embodiment 2, in order to trigger aperiodic CSI-RS for RLM/BFD, DCI extended with existing DCI is used.

An operation example of embodiment 2 will be described with reference to fig. 5. In S101, setting information related to the aperiodic CSI-RS is transmitted from the base station 10 to the terminal 20 through an RRC message. The setting information here may be, for example, conventional information (CSI-apeeriodicdigerstatelist or the like shown in fig. 11) disclosed in non-patent document 2.

In S102, the trigger of the aperiodic CSI-RS (trigger of measurement for the terminal 20) is transmitted from the base station 10 to the terminal 20 through the extended DCI in embodiment 2. The DCI includes information indicating that the aperiodic CSI-RS is used for RLM/BFD.

After a certain time has elapsed since the DCI was received, the terminal 20 receives the aperiodic CSI-RS and performs measurement (S103, S104). The measurement is that made for RLM/BFD. From the perspective of the base station 10, DCI transmission is used as a trigger, and aperiodic CSI-RS is transmitted after a certain time.

Hereinafter, more specific examples will be described as examples 2-1, 2-2 and 2-3. Any 2 or all of examples 2-1, 2-2 and 2-3 may be combined.

< example 2-1>

In embodiment 2-1, the field of the DCI is extended (a new field is added, etc.). As DCI formats and RNTI for scrambling the DCI, existing formats (for example, DCI format 0_1 and DCI format 0_2) and existing RNTIs may be used.

In addition, instead of extending the field of DCI, (a value of) the field of DCI may be interpreted (re) differently from the existing interpretation, so that aperiodic CSI-RS triggering for RLM/BFD is achieved.

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

The plurality of purposes (purpose sets) indicated by the purpose indication field may be specified in the specification, or may be set from the base station 10 to the terminal 20 by RRC. The destination set may consist of one or more of the following destinations 1 to 7.

Purpose 1: triggering for existing purposes (e.g. beam/CSI reporting, tracking)

Purpose 2: triggering for RLM measurements

Purpose 3: triggering for BFD measurements

Purpose 4: triggering for both RLM measurements and BFD measurements

Purpose 5: triggering purpose 6 for RLM measurement or BFD measurement, or both RLM measurement and BFD measurement: destination 1+destination 2/3/4

Purpose 7: destination 1+destination 5

Regarding the purpose 5 of the above-described purposes 1 to 7, the terminal 20 that receives the DCI may refer to the setting of RRC for specifying the purpose (RLM, BFD, or both). Further, purpose 6 and purpose 7 are used for both the existing purpose and the purpose of RLM/BFD.

< example 2-2>

In embodiment 2-2, a new DCI format for aperiodic CSI-RS triggering for RLM/BFD is used. In the case of using a new DCI format, the new field of embodiment 2-1 may or may not be included.

When detecting the new DCI format, the terminal 20 that has received the DCI of 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, and uses the CSI-RS specified by the DCI for RLM/BFD measurement.

< examples 2 to 3>

In embodiments 2-3, the base station 10 scrambles and transmits the existing DCI format with a new RNTI (e.g., RLM-BFR-CSI-RNTI) for triggering of the aperiodic CSI-RS for RLM/BFD.

The terminal 20 can decode the DCI using the new RNTI, determine that the DCI is a DCI for triggering an aperiodic CSI-RS for RLM/BFD, and use a CSI-RS designated by the DCI for RLM/BFD measurement.

< other examples (variants) >

The DCIs of embodiments 2-1, 2-2, and 2-3 may be ue specific (terminal specific), group common (group common), or intra-cell common.

In addition, the destination instruction field of embodiment 2-2 may or may not be included in either of embodiments 2-2 and 2-3. When the DCI of embodiments 2-2 and 2-3 includes the destination indication field, the destination set may be any one or any plurality or all of the destinations 2 to 7.

< Effect of example 2 >

The terminal 20 receiving the DCI of embodiment 2 can determine which aperiodic CSI-RS triggered by the DCI is used for CSI/beam reporting and RLM/BFD. Further, since the purpose of triggering can be accurately determined by DCI, an existing procedure (release 16A-CSI report triggering procedure (Rel-16A-CSI report triggering procedure)) can be used, and existing RRC setting information can be used.

Example 3

Next, example 3 is described. In embodiment 3, in order to realize triggering of aperiodic CSI-RS for RLM/BFD, RRC setting information that extends existing RRC setting information is used.

An example of the operation of embodiment 3 will be described with reference to fig. 5. In S101, setting information related to the aperiodic CSI-RS is transmitted from the base station 10 to the terminal 20 through an RRC message. The setting information here is, for example, information that is expanded (or changed) from the conventional setting information disclosed in non-patent document 2.

In S102, a trigger of the aperiodic CSI-RS (trigger of measurement for the terminal 20) is transmitted from the base station 10 to the terminal 20, for example, through existing DCI. The DCI includes the CSI request field (CSI request field) illustrated in fig. 11.

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

In embodiment 3, the CSI-apeeriodicttriggerstate specified by the CSI request field is associated with the setting information of the aperiodic CSI-RS for RLM/BFD. Therefore, the terminal 20 can receive the aperiodic CSI-RS based on the setting information of the aperiodic CSI-RS and perform measurement for RLM/BFD (S103, S104).

Hereinafter, more specific examples will be described as examples 3-1, 3-2, 3-3 and 3-4. Any 2, any 3 or all of examples 3-1, 3-2, 3-3 and 3-4 may be combined.

< example 3-1>

In the past, measurements for RLM and BFD were only periodic. Therefore, in embodiment 3-1, aperiodic setup can be performed for CSI-RS for RLM and BFD.

That is, in embodiment 3-1, the setting information of the aperiodic CSI-RS is included in the setting information of the reference signals for RLM and BFD. The terminal 20 performs measurement in RLM/BFD using an aperiodic CSI-RS corresponding to the CSI-apeeriodictriggerstate specified by the CSI request field in case that it is detected that the aperiodic CSI-RS is set for RLM/BFD. The aperiodic CSI-RS set for RLM/BFD may be used in the following changes Alt1 and Alt2.

Alt1: aperiodic CSI-RS for RLM/BFD associated with CSI-apiodics triggerstate may also be used for existing purposes (CSI/beam reporting, etc.).

Alt2: whether or not the aperiodic CSI-RS for RLM/BFD associated with CSI-aperiodics triggerstate can be used for existing purposes (CSI/beam reporting, etc.) may be specified by the RRC parameter in the aperiodic CSI-RS setting information.

< concrete example of example 3-1 >

Specific examples of the setting information in example 3-1 are described.

For example, as the setting information of the resources of the aperiodic CSI-RS for RLM/BFD, a new IE parameter (for example: radioLinkMonitoringRS-r 17) is used. That is, the base station 10 transmits setting information having a new IE parameter (for example, radio LinkMonitoringRS-r 17) as setting information of the resource of the aperiodic CSI-RS for RLM/BFD to the terminal 20.

The radio link monitor RS-r17 is set as the setting information of the aperiodic CSI-RS for RLM/BFD associated with CSI-apiodictriggerstate. Thus, the terminal 20 that has received the trigger through DCI can perform measurement for RLM/BFD by the aperiodic CSI-RS set in the RadioLinkMonitoringRS-r17 in association with the designated CSI-apiodicdigerstate.

In the case of application of Alt1 described above, the aperiodic CSI-RS for RLM/BFD associated with CSI-AperiodicTriggerState can also be used for existing purposes. In the case of applying Alt2 described above, whether or not the aperiodic CSI-RS for RLM/BFD associated with the CSI-AperiodicTriggerState can be used for the existing use is set by the radio LinkMonitoringRS-r 17.

Fig. 14 shows an example of the radiolinkmonitorings-r 17 assuming Alt 2. By the purpose shown in fig. 14, it is possible to specify which of RLM (rlf in fig. 14), BFR (beam failure in fig. 14) and both uses of the aperiodic CSI-RS set in the radio link monitor RS-r 17.

< example 3-2>

In example 3-2, as the setting information of CSI-apeeriodictriggerstate, setting information expanded from the conventional setting information disclosed in non-patent document 2 is used. Fig. 15 shows CSI-apiodictriggerstate-r 17 as an example of the setting information of CSI-apiodictriggerstate in embodiment 3-2.

As shown in fig. 15, triggeringpurose is contained. TriggeringPurpose represents the purpose (use) of all aperiodic CSI-RSs associated with the CSI-AperiodicTriggerState-r17. As triggeringpurose, RLM/BFD, a conventional purpose (CSI/beam report), and the like can be set. Fig. 15 shows a subset of the objects 1 to 7 described in example 2.

It is assumed that the terminal 20, which is set with the setting information including the above-described CSI-apiodicdigerstate-r 17, designates a specific CSI-apiodicdigerstate-r 17 by the CSI request field of the DCI.

For example, terminal 20 uses aperiodic CSI-RS associated with CSI-apiodictriggerstate-r 17 for RLM/BFD measurements when it is determined from triggeringunits in CSI-apiodictggerstate-r 17 that RLM/BFD is the object.

Further, for example, when determining that the purpose is both RLM and CSI reporting based on TriggeringPurpose in the CSI-apeeriodictriggerstate-r 17, the terminal 20 uses aperiodic CSI-RS associated with the CSI-apeeriodictriggerstate-r 17 for measurement of RLM and also for CSI reporting.

< Effect of example 3-2 >

In embodiment 3-2, aperiodic CSI-RS for RLM/BFD can be implemented while directly utilizing the existing (release 16) aperiodic CSI-RS reporting triggering procedure.

< examples 3 to 3>

Next, examples 3 to 3 are explained. In example 3-3, the setting information of CSI-apiodictriggerstate was also expanded in the same manner as in example 3-2. More specifically, in examples 3 to 3, as setting information of report setting in CSI-apersidiodic trigger, setting information expanded from the conventional setting information disclosed in non-patent document 2 is used.

FIG. 16 shows an example of the CSI-AperiodicTriggerState in examples 3-3, namely CSI-AperiodicTriggerState-r17.

As shown in fig. 16, triggeringpurpsoe may be set for each CSI-associteddreportconfigmnfo in the associteddreportconfigmnfoslist. Triggeringpurbasis represents the purpose (use) of the aperiodic CSI-RS associated with the corresponding CSI-associpedreportconfigmnfo. As triggeringpurose, RLM/BFD, a conventional purpose (CSI/beam report), and the like can be set. Fig. 16 shows a subset of the objects 1 to 7 described in example 2.

For example, terminal 20 uses aperiodic CSI-RS associated with a certain CSI-associtreportconfigmnfo in CSI-associtreggerstate-r 17 for RLM/BFD measurement when triggeringset according to the CSI-associtreportconfigmnfo in the CSI-associtreggerstate-r 17 determines that RLM/BFD is the object.

For example, when triggeringunits of a certain CSI-associtreggerstate-r 17 is determined to be both of RLM and CSI report, the terminal 20 uses aperiodic CSI-RS associated with the CSI-associtreportconfigmnfo for measurement of RLM and also for measurement of CSI report.

< Effect of example 3-3, etc.)

In embodiments 3-3, aperiodic CSI-RS for RLM/BFD can also be implemented while directly utilizing the existing (release 16) aperiodic CSI-RS reporting triggering procedure.

In addition, in embodiment 3-3, in one CSI-apersidiodic trigger, the purpose can be set for different multiple report settings (reporting settings) respectively. Thus, with respect to each of a different plurality of report setups in 1 CSI-apersidctriggerstate, an associated aperiodic CSI-RS can be used for its respective purpose.

On the other hand, in example 3-2, one purpose was set for one CSI-apeeriodics triggerstate. That is, the same purpose is set for all report settings contained in 1 CSI-apersidctriggerstate. Thus, all aperiodic CSI-RSs associated with different multiple reporting settings in one CSI-aperictriggerstate are used for the same purpose.

< examples 3 to 4>

Next, examples 3 to 4 are explained. In embodiments 3-4, the setting information is extended such that TriggerState for RLM/BFD is included in CSI-apeeriodics triggerstatelist. In addition, as the configuration of TriggerState, a new configuration is used.

Alt1 and Alt2 are illustrated as examples of CSI-AperiodicTriggerStateList used in examples 3-4.

Alt1: in Alt1, CSI-AperiodicTriggerStateList including only new CSI-AperiodicTriggerState for RLM/BFD is used. Fig. 17 shows an example of CSI-apeeriodicttriggerstatelist for Alt 1. As shown in fig. 17, only new CSI-apeeriodictriggerstatelist for RLM/BFD, i.e., CSI-apeeriodictriggerstaterlm-r 17, is included in the CSI-apeeriodictriggerstatelist of Alt 1.

In Alt1, for example, terminal 20 determines whether to use an existing CSI-apeeriodictriggerstatelist or a new CSI-apeeriodictriggerstatelist by DCI received as a trigger of aperiodic CSI-RS. For example, the DCI includes instruction information indicating whether to use the existing CSI-apeeriodictriggerstatelist or the new CSI-apeeriodictriggerstatelist, and the terminal 20 may determine based on the instruction information.

For example, the interpretation of the value of the CSI request field of the DCI may be different from the previous interpretation, for example, if the value of the CSI request field of the DCI is a certain value or more, it may be indicated that a new CSI-apeeriodicdigerstatelist is used, or else, it may be indicated that an existing CSI-apeeriodicdigerstatelist is used.

Alt2: in Alt12, a CSI-apeeriodicttriggerstatelist including a CSI-apeeriodicttriggerstate for an existing purpose (CSI report or the like) and a new CSI-apeeriodicttriggerstate for RLM/BFD is used. Fig. 18 shows an example of CSI-apeeriodicttriggerstatelist for Alt 2. As shown in fig. 18, the CSI-apeeriodicttriggerstatelist of Alt1 includes the existing CSI-apeeriodicttriggerstate and a new CSI-apeeriodicttriggerstate for RLM/BFD, that is, CSI-apeeriodicttriggerstaterlm-r 17.

As the DCI for triggering in Alt2, a conventional DCI can be used. The terminal 20 uses the existing CSI-apeeriodictriggerstate or CSI-apeeriodictriggerstaterlm-r 17 according to the CSI request field of the DCI received from the base station 10.

< CSI-AperiodicTriggerState > in examples 3-4

In the new CSI-apeeriodicttriggerstate for RLM/BFD in embodiments 3-4, the information associated with reporting may not be included, but a list of aperiodic CSI-RS resources for RLM/BFD may be included. Examples 1 and 2 are shown below as structural examples of a new CSI-apeeriodictriggerstate, i.e., CSI-apeeriodictriggerstaterlm-r 17 for RLM/BFD.

Example 1: the CSI-AperiodicTriggerStateRLm-r17 of example 1 is shown in FIG. 19. In example 1, each CSI-AperiodicTriggerStateRLm-r17 is associated with a list of aperiodic CSI-RS resources for RLM/BFD.

In the example of FIG. 19, the radioLinkMonitoringRS-r17 corresponds to the list. This example 1 is also an example of example 3-1. As the radio LinkMonitoringRS-r17 shown in FIG. 19, for example, the structure shown in FIG. 14 of example 3-1 can be used.

Example 2: the CSI-AperiodicTriggerStateRLm-r17 of example 2 is shown in FIG. 20. In example 2, each CSI-apeeriodictriggerstaterlm-r 17 is associated with a list of aperiodic CSI-RS resources for RLM/BFD.

In the example of fig. 20, the information represented by NZP-CSI-RS-resource id corresponds to the list. The purpose of aperiodic CSI-RS resources for RLM/BFD may be set (using purposilomon) in a common manner in the set of the list of aperiodic CSI-RS resources, or may be set (using purposismarate) in a separate manner in the list of aperiodic CSI-RS resources.

< Effect of examples 3-4 >

According to embodiments 3-4, different CSI-apeeriodictriggerstate can be used in RLM/BFD use and existing purpose (CSI report etc.) use.

Example 4

Example 4 is described next. Embodiment 4 is an embodiment with respect to new beam selection in BFR. That is, embodiment 4 is an embodiment in which the terminal 20 can perform aperiodic CSI-RS based measurement for the purpose of new beam selection in BFR.

In order to enable the terminal 20 to perform aperiodic CSI-RS based measurement for the purpose of new beam selection in BFR, the techniques described in embodiment 2 and embodiment 3 can be applied. That is, in the descriptions in embodiment 2 and embodiment 3, the embodiment in which "RLM/BFD" is replaced with "new beam selection" is referred to as embodiment 4. More specifically, examples 4-1 and 4-2 described below are shown.

< example 4-1>

Example 4-1 corresponds to example 2. That is, by the extension of DCI, the terminal 20 can perform aperiodic CSI-RS based measurement for the purpose of new beam selection in BFR. In embodiment 2, the embodiment in which "RLM/BFD" is replaced with "new beam selection" is referred to as embodiment 4-1.

< example 4-2>

Example 4-2 corresponds to example 3. That is, by expanding the RRC setting information, the terminal 20 can perform aperiodic CSI-RS based measurement for the purpose of new beam selection in the BFR. Basically, in embodiment 3, the embodiment in which "RLM/BFD" is replaced with "new beam selection" becomes embodiment 4-2.

As a more specific example, an example of setting information used in embodiment 4-2 for embodiment 3-1 is shown in fig. 21. As shown in fig. 21, a candidatebeam rslist-r17, which is a list of beams detected by measurement of the aperiodic CSI-RS, is set. The resources of each aperiodic CSI-RS in candidatebeam rslist-r17 are set by PRACH-a-CSI-resource dedicatedbfr-r 1.

In embodiment 4-2 for embodiment 3-1, the terminal 20 performs detection of a new beam by measuring an aperiodic CSI-RS specified by candidatebeam rslist-r17 associated with a trigger state (trigger state) specified by DCI.

With respect to embodiments 3-2 to 3-4, in embodiments 3-2 to 3-4, the embodiment in which the purpose is replaced with "new beam selection" from "RLM/BFD" is referred to as embodiment 4-2. Further, a correspondence relationship between aperiodic CSI-RS resources and PRACH resources that can be used for new beam selection may be set.

(modification)

Next, examples applicable to any one of embodiments 1 to 4 will be described as modified examples.

< modification 1>

The relationship between the beam of the aperiodic CSI-RS triggered for RLM/BFR and the beam used at LBT listening can be determined. The relationship may be defined by a specification, or may be set from the base station 10 to the terminal 20. Examples of the relationship include examples 1 to 3 described below.

Example 1: the beam of the aperiodic CSI-RS triggered for RLM/BFR is the same as the beam direction used at LBT interception, and the width (thickness) is also the same.

Example 2: the beam of the aperiodic CSI-RS triggered for RLM/BFR is the same as the beam direction used for LBT interception, and the width is different. For example, the beam width of the aperiodic CSI-RS is made narrower than that used in LBT interception.

Example 3: the beam of the aperiodic CSI-RS triggered for RLM/BFR is different from the direction of the beam used for LBT interception, and the width is also different. For example, a space defined by the direction and width of the beam of the aperiodic CSI-RS is made to be included in a space defined by the direction and width of the beam used for LBT listening corresponding to the COT.

< modification example 2>

Each of embodiments 1 to 4 can also be applied to a case where frequencies in a specific frequency range are used in the base station 10 and the terminal 20. The specific frequency range may also be 52.6-71 GHz.

< modification example 3>

Each of embodiments 1 to 4 can also be applied to a case where a specific condition is satisfied. For example, implementation availability of the action of using the aperiodic CSI-RS for RLM/BFR may also be determined according to whether the LBT action is ON (ON) or OFF (OFF), or whether the used band is an unlicensed band or an licensed band.

For example, when the LBT process is on (or the used band is an authorized band), the base station 10 may transmit DCI described in embodiment 2, so that the terminal 20 uses the aperiodic CSI-RS for RLM/BFR.

In addition, when the LBT process is turned on (or when the used band is an unlicensed band), the base station 10 may perform RRC setting described in embodiment 3, thereby enabling the terminal 20 to use the aperiodic CSI-RS for RLM/BFR.

< modification 4>

Embodiment 2 (DCI extension) and embodiment 3 (RRC extension) may be implemented in combination. The same is true for example 4 corresponding to example 2 (DCI extension) and example 3 (RRC extension).

< modification 5>

Whether or not the terminal 20 uses the examples described in examples 1 to 4 may be set, instructed, reported, or the like by examples 1 to 4 described below.

Example 1: the setting of the terminal 20 is performed by higher layer parameters (e.g., RRC, MAC CE).

Example 2: reporting from the terminal 20 to the base station 10 through UE capability (UE capability).

Example 3: are specified in the specification.

Example 4: the determination is made based on the setting of the higher layer parameters and the reported UE capabilities (combination of examples 1 and 2).

< modification 6>

Modification 6 is an example of UE capability. UE capabilities shown in examples 1 to 8 below may be defined, and any UE capability may be reported from the terminal 20 to the base station 10. This operation corresponds to the operation of S100 in fig. 5.

Example 1: indicating whether the terminal 20 supports UE capabilities for aperiodic CSI-RS for RLM/BFR.

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

Example 3: indicating whether the terminal 20 supports UE capabilities of periodic CSI-RS in addition to aperiodic CSI-RS for RLM/BFR.

Example 4: indicating whether the terminal 20 supports UE capability of a new DCI format triggering an aperiodic CSI-RS for RLM/BFR.

Example 5: indicating whether the terminal 20 supports UE capability of an existing DCI format using a new RNTI triggering an aperiodic CSI-RS for RLM/BFR.

Example 6: indicating whether the terminal 20 supports UE capability of an existing DCI format using an existing RNTI, which triggers an aperiodic CSI-RS for RLM/BFR.

Example 7: indicating whether the terminal 20 supports UE capabilities of aperiodic CSI-RS for RLM/BFR measurement purposes in addition to existing purposes (e.g., beam/CSI reporting, tracking).

Example 8: indicating whether the terminal 20 supports UE capability for deciding which purpose to use RRC setup information of the aperiodic CSI-RS.

According to the technique of the present embodiment described above, a technique is provided in which a terminal can perform failure detection and recovery appropriately in a wireless communication system.

(device Structure)

Next, a functional configuration example of the base station 10 and the terminal 20 that execute the above-described processing and operation 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. 22, the base station 10 includes a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in fig. 22 is merely an example. The names of the functional sections and the functional distinction may be arbitrary as long as the operations according to the embodiments of the present invention can be executed. The transmitting unit 110 and the receiving unit 120 may be collectively referred to as a communication unit.

The transmitting unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly. 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. The transmitting unit 110 also has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL/UL control signals, DCI based on PDCCH, data based on PDSCH, and the like to the terminal 20.

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

The control unit 140 performs scheduling of DL reception or UL transmission by the terminal 20 via the transmission unit 110. The control unit 140 also includes a function of performing LBT. The transmitting unit 110 may include a function unit related to signal transmission in the control unit 140, and the receiving unit 120 may include a function unit related to signal reception in the control unit 140. The transmitter 110 may be referred to as a transmitter, and the receiver 120 may be referred to as a receiver.

< terminal 20>

Fig. 23 is a diagram showing an example of the functional configuration of the terminal 20. As shown in fig. 23, the terminal 20 includes a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in fig. 12 is merely an example. The names of the functional sections and the functional distinction may be arbitrary as long as the operations according to the embodiments of the present invention can be executed. The transmitting unit 210 and the receiving unit 220 may be collectively referred to as a communication unit.

The transmitting unit 210 generates a transmission signal from the transmission data, and transmits the transmission signal wirelessly. The receiving unit 220 receives various signals wirelessly and acquires a higher layer signal from the received physical layer signal. The reception unit 220 also has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL/UL/SL control signals, DCI based on PDCCH, data based on PDSCH, and the like transmitted from the base station 10. For example, as D2D communication, the transmitting unit 210 may transmit PSCCH (Physical Sidelink Control Channel: physical side link control channel), PSSCH (Physical Sidelink Shared Channel: physical side link shared channel), PSDCH (Physical Sidelink Discovery Channel: physical side link discovery channel), PSBCH (Physical Sidelink Broadcast Channel: physical side link broadcast channel), or the like to the other terminal 20, and the receiving unit 120 may receive PSCCH, PSSCH, PSDCH, PSBCH, or the like from the other terminal 20.

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

The terminal and the base station according to the present embodiment may be configured as a terminal or a base station shown below. In addition, the following measurement method may be also implemented.

< Structure relating to examples 2 and 4 >

(item 1)

A terminal, having:

a receiving unit that receives downlink control information from a base station; and

and a control unit that performs measurement for radio link monitoring or beam fault recovery by an aperiodic reference signal received from the base station, based on a trigger based on the downlink control information.

(item 2)

The terminal according to claim 1, wherein,

the downlink control information includes the purpose of the aperiodic reference signal,

the control unit determines that the aperiodic reference signal is a reference signal used for radio link monitoring or beam fault recovery according to the purpose.

(item 3)

The terminal according to claim 1 or 2, wherein,

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 4)

The terminal according to any one of items 1 to 3, wherein,

The control unit determines that the aperiodic reference signal is a reference signal used for radio link monitoring or beam failure recovery, based on an RNTI used for scrambling the downlink control information.

(item 5)

A base station, wherein,

the base station includes a transmitting unit configured to transmit downlink control information to a terminal,

the transmitting unit transmits an aperiodic reference signal in response to a trigger based on the downlink control information, and the terminal performs measurement for radio link monitoring or beam fault recovery using the aperiodic reference signal.

(item 6)

A measurement method in a terminal, having the steps of:

receiving downlink control information from a base station; and

and according to the trigger based on the downlink control information, performing measurement for radio link monitoring or beam fault recovery through an aperiodic reference signal received from the base station.

With any of the above configurations, a technique by which a terminal can perform failure detection and recovery appropriately in a wireless communication system can be provided. According to item 2, the object can be grasped explicitly. According to items 3 and 4, the terminal can grasp the destination even if the destination is not explicitly included.

< Structure relating to examples 3 and 4 >

(item 1)

A terminal, having:

a receiving unit that receives, from a base station, setting information of an aperiodic reference signal used for radio link monitoring or beam failure recovery; and

and a control unit that performs measurement for radio link monitoring or beam fault recovery by the aperiodic reference signal according to a trigger based on the downlink control information received from the base station.

(item 2)

A terminal, having:

a receiving unit that receives, from a base station, setting information including the purpose of an aperiodic reference signal; and

and a control unit that performs measurement for radio link monitoring or beam fault recovery by means of an aperiodic reference signal specified by the setting information according to the purpose, in response to a trigger based on downlink control information received from the base station.

(item 3)

The terminal according to claim 2, wherein,

the purpose is included in each trigger state of the setting information.

(item 4)

The terminal according to claim 2 or 3, wherein,

the setting information has a list of trigger states,

all trigger states in the list are information specifying aperiodic reference signals for radio link monitoring or beam fault recovery; or alternatively

The partial trigger state of all trigger states in the list is information specifying an aperiodic reference signal for radio link monitoring or beam fault recovery.

(item 5)

A base station, wherein,

the base station includes a transmitting unit that transmits setting information including a purpose of an aperiodic reference signal to a terminal,

the transmitting unit transmits downlink control information, and the terminal performs measurement for radio link monitoring or beam fault recovery by using an aperiodic reference signal specified by the setting information according to the destination, based on a trigger based on the downlink control information.

(item 6)

A measurement method performed by a terminal, having the steps of:

receiving, from a base station, setting information including an object of an aperiodic reference signal; and

according to a trigger based on the downlink control information received from the base station, measurement for radio link monitoring or beam fault recovery is performed by an aperiodic reference signal specified by the setting information in correspondence with the purpose.

With any of the above configurations, a technique by which a terminal can perform failure detection and recovery appropriately in a wireless communication system can be provided. According to item 3, the purpose can be set in each trigger state. According to item 4, a change of the trigger state list can be achieved.

(hardware construction)

The block diagrams (fig. 22 and 23) used in the description of the above embodiment show blocks in units of functions. These functional blocks (structures) are realized by any combination of at least one of hardware and software. The implementation method of each functional block is not particularly limited. That is, each functional block may be realized by using one device physically or logically combined, or may be realized by directly or indirectly (for example, by using a wire, a wireless, or the like) connecting two or more devices physically or logically separated from each other, and using these multiple devices. The functional blocks may also be implemented in combination with software in the apparatus or apparatuses.

The functions include, but are not limited to, judgment, decision, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, view, broadcast (broadcast), notification (notification), communication (communication), forwarding (forwarding), configuration (configuration), reconfiguration (allocation (allocating, mapping), assignment (assignment), and the like. For example, a functional block (configuration unit) that causes transmission to function is called a transmitter (transmitting unit) or a transmitter (transmitter). In short, the implementation method is not particularly limited as described above.

For example, the base station 10, the terminal 20, and the like in one embodiment of the present disclosure may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig. 24 is a diagram showing an example of the hardware configuration of the base station 10 and the terminal 20 according to one embodiment of the present disclosure. The base station 10 and the terminal 20 may be configured as a computer device physically 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.

In addition, in the following description, the term "means" may be replaced with "circuit", "device", "unit", or the like. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the illustrated devices, or may be configured to include no part of the devices.

The functions in the base station 10 and the terminal 20 are realized by the following methods: predetermined software (program) is read into hardware such as the processor 1001 and the storage device 1002, and the processor 1001 performs an operation to control communication by the communication device 1004 or to control at least one of reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a central processing unit (CPU: central Processing Unit) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, the control unit 140, the control unit 240, and the like may be realized by the processor 1001.

Further, the processor 1001 reads out a program (program code), a software module, data, or the like from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes accordingly. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiment is used. For example, the control unit 140 of the base station 10 shown in fig. 22 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. 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 the above-described various processes are described as being executed by 1 processor 1001, the above-described various processes may be executed simultaneously or sequentially by 2 or more processors 1001. The processor 1001 may also be implemented by more than one chip. In addition, the program may also be transmitted from the network via a telecommunication line.

The storage device 1002 is a computer-readable recording medium, and may be configured by at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM: erasable programmable Read Only Memory), EEPROM (Electrically Erasable Programmable ROM: electrically erasable programmable Read Only Memory), RAM (Random Access Memory: random access Memory), and the like. The storage 1002 may also be referred to as a register, a cache, a main memory (main storage), or the like. The storage device 1002 can store a program (program code), a software module, or the like that can be executed to implement a communication method according to an embodiment of the present disclosure.

The auxiliary storage device 1003 is a computer-readable recording medium, and may be constituted by at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a Floppy disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk, a smart card, a flash memory (for example, a card, a stick, a Key drive), a Floppy (registered trademark) disk, a magnetic stripe, and the like).

The communication device 1004 is hardware (transceiver) for performing communication between computers via at least one of a wired network and a wireless network, and may be referred to as a network device, a network controller, a network card, a communication module, or the like, for example. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like, for example, to realize at least one of frequency division duplexing (FDD: frequency Division Duplex) and time division duplexing (TDD: time Division Duplex). For example, a transmitting/receiving antenna, an amplifier unit, a transmitting/receiving unit, a transmission path interface, and the like may be realized by the communication device 1004. The transmitting/receiving unit may be physically or logically implemented as a separate unit.

The input device 1005 is an input apparatus (for example, a keyboard, a mouse, a microphone, a switch, a key, a sensor, or the like) that receives an input from the outside. The output device 1006 is an output apparatus (for example, a display, a speaker, an LED lamp, or the like) that performs output to the outside. The input device 1005 and the output device 1006 may be integrally formed (for example, a touch panel).

The processor 1001 and the storage device 1002 are connected by a bus 1007 for communicating information. The bus 1007 may be formed by a single bus or may be formed by different buses between devices.

The base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP: digital Signal Processor), an ASIC (Application Specific Integrated Circuit: application specific integrated circuit), a PLD (Programmable Logic Device: programmable logic device), an FPGA (Field Programmable Gate Array: field programmable gate array), or may be configured to implement a part or all of the functional blocks by the hardware. For example, the processor 1001 may also be implemented using at least one of these hardware.

(supplement of the embodiment)

While 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 will appreciate various modifications, substitutions, alternatives, and the like. Specific numerical examples are described for the purpose of promoting the understanding of the present invention, but these numerical values are merely examples unless otherwise indicated, and any appropriate values may be used. The distinction between items in the above description is not essential to the present invention, and two or more items described in one item may be used in combination as required, or items described in another item may be applied (unless contradiction arises). The boundaries of functional units or processing units in the functional block diagrams do not necessarily correspond to the boundaries of physical components. The operation of the plurality of functional units may be performed by one physical component, or the operation of one functional unit may be performed by a plurality of physical components. With regard to the processing steps described in the embodiments, the order of processing may be exchanged without contradiction. For ease of illustration, the base station 10 and the terminal 20 are illustrated using functional block diagrams, but such means may also be implemented in hardware, software, or a combination thereof. The software operating according to the embodiment of the present invention by the processor of the base station 10 and the software operating according to the embodiment of the present invention by the processor of the terminal 20 may be stored in Random Access Memory (RAM), flash memory, read Only Memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), a removable disk, a CD-ROM, a database, a server, and any other suitable storage medium, respectively.

The information is not limited to the form and embodiment described in the present disclosure, and other methods may be used. For example, the notification of the information may be implemented by physical layer signaling (e.g., DCI (Downlink Control Information: downlink control information), UCI (Uplink Control Information: uplink control information)), higher layer signaling (e.g., RRC (Radio Resource Control: radio resource control) signaling, MAC (Medium Access Control: medium access control) signaling, broadcast information (MIB (Master Information Block: master information block), SIB (System Information Block: system information block)), other signals, or a combination thereof.

The various forms/embodiments described in the present disclosure may also be applied to at least one of systems using LTE (Long Term Evolution: long term evolution), LTE-a (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4 th generation mobile communication system: fourth generation mobile communication system), 5G (5 th generation mobile communication system: fifth generation mobile communication system), FRA (Future Radio Access: future wireless access), NR (new Radio: new air interface), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband: ultra mobile broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-wide-band), bluetooth (registered trademark), other suitable systems, and next generation systems extended accordingly. Further, a plurality of systems (for example, a combination of 5G and at least one of LTE and LTE-a) may be applied in combination.

The processing steps, sequences, flows, and the like of the respective modes/embodiments described in the present specification may be exchanged without contradiction. For example, for the methods described in this disclosure, elements of the various steps are presented using an illustrated order, but are not limited to the particular order presented.

In the present specification, the specific operation performed by the base station 10 may be performed by an upper node (upper node) thereof, as the case may be. In a network composed of one or more network nodes (network nodes) having a base station 10, it is apparent that various actions performed for communication with a terminal 20 may be performed by at least one of the base station 10 and other network nodes (for example, MME or S-GW, etc. are considered but not limited thereto) other than the base station 10. In the above, the case where 1 other network node is exemplified except the base station 10, but the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW).

Information, signals, and the like described in the present disclosure can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). Or may be input or output via a plurality of network nodes.

The input or output information may be stored in a specific location (for example, a memory), or may be managed using a management table. Information input or output, etc. may be rewritten, updated, or recorded. The output information and the like may also be deleted. The input information and the like may also be transmitted to other devices.

The determination in the present disclosure may be performed by a value (0 or 1) represented by 1 bit, may be performed by a Boolean value (true or false), and may be performed by a comparison of numerical values (e.g., a comparison with a predetermined value).

With respect to software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, should be broadly interpreted to refer to a command, a set of commands, code, a code segment, program code, a program (program), a subroutine, a software module, an application, a software package, a routine, a subroutine, an object, an executable, a thread of execution, a procedure, a function, or the like.

In addition, software, commands, information, etc. may be transmitted and received via a transmission medium. For example, in the case where software is transmitted from a web page, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL: digital Subscriber Line), etc.) and a wireless technology (infrared, microwave, etc.), at least one of the wired and wireless technologies is included within the definition of transmission medium.

Information, signals, etc. described in this disclosure may also be represented using any of a variety of different technologies. For example, data, commands, instructions (commands), information, signals, bits, symbols, chips (chips), and the like may be referenced throughout the above description by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

In addition, the terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and the symbol may be a signal (signaling). In addition, the signal may also be a message. In addition, the component carrier (CC: component Carrier) may also be referred to as a carrier frequency, a cell, a frequency carrier, etc.

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

In addition, information, parameters, and the like described in this disclosure may be expressed using absolute values, relative values to predetermined values, or other information corresponding thereto. For example, the radio resource may be indicated with an index.

The names used for the above parameters are non-limiting names in any respect. Further, the numerical formulas and the like using these parameters may also be different from those explicitly disclosed in the present disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by all appropriate names, and thus the various names assigned to the various channels and information elements are non-limiting names in any respect.

In the present disclosure, terms such as "Base Station", "radio Base Station", "fixed Station", "NodeB", "eNodeB (eNB)", "gndeb (gNB)", "access point", "transmission point (transmission point)", "reception point", "transmission point", "reception point", "cell", "sector", "cell group", "carrier", "component carrier", and the like may be used interchangeably. The terms macrocell, microcell, femtocell, picocell, and the like are also sometimes used to refer to a base station.

The base station can accommodate one or more (e.g., 3) cells. In the case of a base station accommodating a plurality of cells, the coverage area of the base station can be divided into a plurality of smaller areas, each of which can also provide communication services through a base station subsystem (e.g., a small base station RRH: remote Radio Head (remote radio head) for indoor use). The term "cell" or "sector" refers to a part or the whole of a coverage area of at least one of a base station and a base station subsystem that perform communication services within the coverage area.

In the present disclosure, terms such as "Mobile Station", "terminal", "User Equipment", "terminal", and the like may be used interchangeably.

For mobile stations, those skilled in the art are sometimes referred to by the following terms: a subscriber station, mobile unit (mobile unit), subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, or some other suitable terminology.

At least one of the base station and the mobile station may be referred to as a transmitting apparatus, a receiving apparatus, a communication apparatus, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The mobile body may be a vehicle (e.g., an automobile, an airplane, etc.), a mobile body that moves unmanned (e.g., an unmanned aerial vehicle, an autopilot, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station also includes a device that does not necessarily move during a communication operation. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things: internet of things) device such as a sensor.

In addition, the base station in the present disclosure may be replaced with a terminal. For example, the structure of replacing communication between a base station and a terminal with communication between a plurality of terminals 20 (e.g., may also be referred to as D2D (Device-to-Device), V2X (Vehicle-to-evaluation), etc.) may also be applied to various forms/embodiments of the present disclosure. In this case, the terminal 20 may have the functions of the base station 10. Further, the terms "upstream" and "downstream" may be replaced with terms (e.g., "side") corresponding to the inter-terminal communication. For example, the uplink channel, the downlink channel, and the like may be replaced with side channels.

Likewise, the terminals in the present disclosure may be replaced with base stations. In this case, the base station may have the functions of the terminal.

The terms "determining" and "determining" used in the present disclosure may include various operations. The "judgment" and "decision" may include, for example, a matter in which judgment (determination), calculation (calculation), processing (processing), derivation (development), investigation (investigation), search (lookup up, search, inquiry) (for example, a search in a table, database, or other data structure), confirmation (evaluation), or the like are regarded as a matter in which "judgment" and "decision" are performed. Further, "determining" or "deciding" may include a matter in which reception (e.g., reception of information), transmission (e.g., transmission of information), input (input), output (output), access (e.g., access of data in a memory) is performed as a matter in which "determining" or "deciding" is performed. Further, "judging" and "determining" may include matters of solving (resolving), selecting (selecting), selecting (setting), establishing (establishing), comparing (comparing), and the like as matters of judging and determining. That is, "determining" or "determining" may include treating certain actions as being "determined" or "decided". The "judgment (decision)" may be replaced by "assumption", "expectation", "consider", or the like.

The terms "connected", "coupled" and "coupled" or any variation of these terms refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intervening elements between two elements "connected" or "coupled" to each other. The combination or connection of the elements may be physical, logical, or a combination of these. For example, "connection" may be replaced with "access". As used in this disclosure, two elements may be considered to be "connected" or "joined" to each other using at least one of one or more wires, cables, and printed electrical connections, and as some non-limiting and non-inclusive examples, electromagnetic energy or the like having wavelengths in the wireless frequency domain, the microwave region, and the optical (including both visible and invisible) region.

The reference signal may be simply referred to as RS (Reference Signal) or may be referred to as Pilot (Pilot) depending on the standard applied.

As used in this disclosure, the recitation of "according to" is not intended to mean "according to" unless explicitly recited otherwise. In other words, the term "according to" means "according to" and "according to" at least.

Any reference to elements referred to using "1 st", "2 nd", etc. as used in this disclosure also does not entirely define the number or order of these elements. These calls may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, references to elements 1 and 2 do not indicate that only two elements can be taken or that in any form element 1 must precede element 2.

The "unit" in the structure of each device may be replaced with "part", "circuit", "device", or the like.

Where the terms "include", "comprising" and variations thereof are used in this disclosure, these terms are intended to be inclusive as well as the term "comprising". Also, the term "or" as used in this disclosure does not refer to exclusive or.

A radio frame may be made up of one or more frames in the time domain. In the time domain, one or more of the frames may be referred to as subframes. A subframe may also be composed of one or more slots in the time domain. The subframes may also be a fixed length of time (e.g., 1 ms) independent of the parameter set (numerology).

The parameter set may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The parameter set may represent, for example, at least one of a subcarrier spacing (SCS: subCarrier Spacing), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI: transmission Time Interval), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by the transceiver in the frequency domain, a specific windowing process performed by the transceiver in the time domain, and the like.

A slot may be formed in the time domain from one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing: orthogonal frequency division multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access: single carrier frequency division multiple access) symbols, etc.). A slot may be a unit of time based on a set of parameters.

A slot may contain multiple mini-slots. Each mini-slot may be made up of one or more symbols in the time domain. In addition, the mini-slot may also be referred to as a sub-slot. Mini-slots may be made up of a fewer number of symbols than slots. PDSCH (or PUSCH) transmitted in units of time greater than the mini-slot may be referred to as PDSCH (or PUSCH) mapping type (type) a. PDSCH (or PUSCH) transmitted using mini-slots may be referred to as PDSCH (or PUSCH) mapping type (type) B.

The radio frame, subframe, slot, mini-slot, and symbol each represent a unit of time when a signal is transmitted. The radio frame, subframe, slot, mini-slot, and symbol may each use corresponding other designations.

For example, 1 subframe may be referred to as a transmission time interval (TTI: transmission Time Interval), a plurality of consecutive subframes may also be referred to as TTIs, and 1 slot or 1 mini slot may also be referred to as TTIs. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the conventional LTE, may be a period (for example, 1 to 13 symbols) shorter than 1ms, or may be a period longer than 1 ms. In addition, the unit indicating the TTI may be referred to not as a subframe but as a slot, a mini-slot, or the like. In addition, 1 slot may also be referred to as a unit time. The unit time may be different for each cell according to the parameter set.

Here, TTI refers to, for example, a scheduled minimum time unit in wireless communication. For example, in the LTE system, the base station performs scheduling for allocating radio resources (bandwidth, transmission power, and the like that can be used in each terminal 20) to each terminal 20 in TTI units. In addition, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a data packet (transport block), a code block, a codeword, or the like after channel coding, or may be a processing unit such as scheduling or link adaptation. In addition, when a TTI is given, the time interval (e.g., number of symbols) in which a transport block, a code block, a codeword, etc. is actually mapped may be shorter than the TTI.

In addition, in the case where 1 slot or 1 mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may become a minimum time unit of scheduling. Further, the number of slots (mini-slots) constituting the minimum time unit of scheduling can be controlled.

TTIs with a time length of 1ms are also referred to as normal TTIs (TTIs in LTE rel.8-12), normal TTI (normal TTI), long TTIs (long TTIs), normal subframes (normal subframes), long (long) subframes, time slots, etc. A TTI that is shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI (short TTI), a partial or fractional TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

In addition, for a long TTI (long TTI) (e.g., a normal TTI, a subframe, etc.), a TTI having a time length exceeding 1ms may be understood, and for a short TTI (short TTI) (e.g., a shortened TTI, etc.), a TTI having a TTI length less than the long TTI (long TTI) and a TTI length greater than 1ms may be understood.

A Resource Block (RB) is a resource allocation unit of a time domain and a frequency domain, in which one or more consecutive subcarriers (subcarriers) may be included. The number of subcarriers included in the RB may be the same regardless of the parameter set, for example, may be 12. The number of subcarriers included in the RB may also be determined according to the parameter set.

Further, the time domain of the RB may contain one or more symbols, which may be 1 slot, 1 mini slot, 1 subframe, or 1 TTI in length. 1 TTI, 1 subframe, etc. may be respectively composed of one or more resource blocks.

In addition, one or more RBs may also be referred to as Physical resource blocks (PRB: physical RBs), subcarrier groups (SCG: sub-Carrier groups), resource element groups (REG: resource Element Group), PRB pairs, RB peering.

Furthermore, a Resource block may be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

The Bandwidth Part (BWP: bandwidth Part) (which may also be referred to as partial Bandwidth etc.) may also represent a subset of consecutive common RBs (common resource blocks: common resource blocks) for a certain parameter set in a certain carrier. Here, the common RB may be determined by an index of the RB with reference to a common reference point of the carrier. PRBs may be defined in a certain BWP and numbered within the BWP.

BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP). One or more BWP may be set for the UE within 1 carrier.

At least one of the set BWP may be active, and a case where the UE transmits and receives a predetermined signal/channel outside the active BWP may not be envisaged. In addition, "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

The above-described structures of radio frames, subframes, slots, mini-slots, symbols, and the like are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, and the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and the like may be variously changed.

In the present disclosure, for example, where an article is added by translation as in a, an, and the in english, the present disclosure also includes a case where a noun following the article is in plural.

In the present disclosure, the term "a and B are different" may mean that "a and B are different from each other". The term "a and B are different from C" may also be used. The terms "separate," coupled, "and the like may also be construed as" different.

The various forms and embodiments described in this disclosure may be used alone, in combination, or switched depending on the implementation. Note that the notification of the predetermined information is not limited to being performed explicitly (for example, notification of "yes" or "X"), and may be performed implicitly (for example, notification of the predetermined information is not performed).

The present disclosure has been described in detail above, but it should be 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 implemented as 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 intended to be illustrative, and not in any limiting sense.

Description of the reference numerals

10: base station

110: transmitting unit

120: receiving part

130: setting part

140: control unit

20: terminal

210: transmitting unit

220: receiving part

230: setting part

240: control unit

1001: processor and method for controlling the same

1002: storage device

1003: auxiliary storage device

1004: communication device

1005: input device

1006: output device

Claims

1. A terminal, having:

2. A terminal, having:

3. The terminal of claim 2, wherein,

the purpose is included in each trigger state of the setting information.

4. A terminal according to claim 2 or 3, wherein,

the setting information has a list of trigger states,

5. A base station, wherein,

6. A measurement method performed by a terminal, having the steps of: