CN115915176A

CN115915176A - Method executed by user equipment and user equipment

Info

Publication number: CN115915176A
Application number: CN202110899054.6A
Authority: CN
Inventors: 张崇铭; 刘仁茂
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2021-08-05
Filing date: 2021-08-05
Publication date: 2023-04-04
Also published as: WO2023011517A1

Abstract

The invention provides a method executed by user equipment and the user equipment, the method is a method for executing beam failure report by UE, comprising the following steps: the UE generates an MAC CE for reporting cell-specific beam failure information and TRP-specific beam failure information at the same time; and the UE sends the generated MAC CE to a base station, wherein the MAC CE has domains Ci, TRP, AC, candidate RS ID and R, the Ci domain indicates the beam failure detection condition of the serving cell configured with cell-specific BFR or indicates the beam failure detection condition of the serving cell configured with TRP-specific BFR, and i corresponds to the serial number of the serving cell; this field of TRP indicates the failed detection of the beam at this TRP; the AC field indicates whether a Candidate RS ID exists in the current byte; the Candidate RS ID field is set to the sequence number of the reference signal whose measured value is above a configured threshold; r this field is the reserved bit.

Description

Method executed by user equipment and user equipment

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a method for performing beam failure reporting by a user equipment and a corresponding user equipment.

Background

In 12.2019, at the third Generation Partnership project (3 rd Generation Partnership project:3 GPP) RAN #86, work items for Further enhancement of MIMO (FeMIMO: further enhancements on MIMO) of Release 17 were proposed (see non-patent document: RP-193133New WID. The latest version of this work item is referred to non-patent literature: RP-211586 Revised (2 nd) WID propofol FeMIMO. This work project primarily investigated the enhancement of multi-beam (multi-beam) operation, the enhancement of multi-TRP (multi-TRP) operation, the enhancement of SRS, and the enhancement of CSI measurement and reporting. For multi-beam and multi-TRP operation enhancements, scenarios involving intra-cells also involve inter-cells.

In the prior art, a base station may configure a reference signal for beam failure detection and/or beam failure recovery for each serving cell of a UE, may send cell information including a beam failure to occur to the base station when a beam failure occurs in a currently serving beam through detection, and may detect the reference signal for beam failure detection and/or beam failure recovery to obtain a candidate beam, and notify the network of relevant information through a beam failure recovery process. Such a Cell may be referred to as a Cell configured with a Cell specific BFR (Cell specific BFR).

In FeMIMO, in order to better support multiple TRPs, reference signals for beam failure detection and/or beam failure recovery may be configured for each TRP of a serving cell, respectively, and when a beam failure occurs in a currently serving beam through detection, the reference signals for beam failure detection and/or beam failure recovery may be detected to obtain candidate beams, and relevant information is notified to a network through a beam failure recovery process. In FeMIMO, the process of beam failure recovery can be performed on a per TRP basis. Such a cell may be referred to as a cell configured with a TRP specific BFR (TRP specific BFR).

The invention discusses the relevant problem of how to report beam failure in a Cell configured with Cell specific BFR and TRP specific BFR.

Disclosure of Invention

The invention provides a solution to the problem of how to report beam failure in a Cell configured with Cell specific BFR and TRP specific BFR.

An object of the present invention is to provide a method performed by a user equipment and a corresponding user equipment, which can report a beam failure in a Cell configured with a Cell specific BFR and a TRP specific BFR.

According to an aspect of the present invention, there is provided a method performed by a user equipment, which is a method for performing beam failure reporting by a user equipment UE, including the steps of:

the UE generates an MAC CE for reporting cell-specific beam failure information and TRP-specific beam failure information at the same time; and

the UE transmits the generated MAC CE to the base station,

wherein, the MAC CE has fields Ci, TRP, AC, candidate RS ID and R,

ci: this field indicates a beam failure detection situation of a serving cell configured with a cell-specific BFR, or indicates a beam failure detection situation of a serving cell configured with a TRP-specific BFR, where i corresponds to a sequence number of the serving cell;

a TRP: this field indicates the failed detection of the beam on this TRP;

AC: this field indicates whether a Candidate RS ID exists in the current byte;

candidate RS ID: this field is set to the sequence number of the reference signal for which the measurement value is above a configured threshold;

r: this field is a reserved bit.

In the above-described method performed by the user equipment, preferably,

when Ci is set to 0, if the corresponding serving cell is configured with a cell-specific BFR, it indicates that the serving cell has not detected a beam failure; if the corresponding serving cell is configured with a TRP-specific BFR, it indicates that no beam failure is detected on all TRPs of the serving cell configured;

when Ci is set to 1, if the corresponding serving cell is configured with cell-specific BFR, it indicates that the serving cell has detected a beam failure; if the corresponding serving cell is configured with TRP specific BFR, it indicates that the beam failure is detected on at least one TRP on the serving cell.

In the above-described method performed by the user equipment, preferably,

for a serving cell configured with cell-specific BFR, if its corresponding Ci field is set to 1, there is a corresponding byte containing at least the AC field;

for a serving cell configured with a TRP-specific BFR, if its corresponding Ci field is set to 1, there is a corresponding byte containing at least the TRP field, and the number of bytes does not exceed the number of TRPs configured.

In the above-described method performed by the user equipment, preferably,

when TRP field is set to 0, it indicates that no beam failure is detected on this TRP;

when TRP field is set to 1, it indicates that a beam failure is detected on TRP.

In the above-described method performed by the user equipment, preferably,

when TRP field is set to 0, AC field in the same byte is regarded as absent or as a reserved bit.

In the above-described method performed by the user equipment, preferably,

when the AC field is set to 1, it also indicates that the Candidate RS ID field exists;

when the field AC is set to 0, the byte in which the field Candidate RS ID is located is treated as a reserved bit.

In the method performed by the user equipment, preferably, the method further includes the following steps:

the UE generates two different MAC CEs, namely a cell-specific BFR MAC CE and a TRP-specific BFR MAC CE;

the UE performs MAC PDU packet packing; and

and after the MAC PDU package is completed, the UE sends the MAC PDU to the base station.

In the above-described method performed by the user equipment, preferably,

and the UE performs the operation that the group packet priority of the cell-specific BFR MAC CE is always higher than that of the TRP-specific BFR MAC CE in the process of carrying out MAC PDU group packet.

In the above-described method performed by the user equipment, preferably,

when the special cell is configured with the TRP special BFR, if the generated TRP special BFR MAC CE contains the wave beam failure information of the TRP of the special cell, the UE executes the operation that the group packet priority of the TRP special BFR MAC CE is higher than that of the cell special BFR MAC CE.

According to another aspect of the present invention, there is provided a user equipment comprising:

a processor; and

a memory having instructions stored thereon,

the instructions, when executed by the processor, cause the user equipment to perform the method according to the above description.

According to the method performed by the user equipment and the corresponding user equipment, the beam failure can be reported in the Cell configured with the Cell specific BFR and the TRP specific BFR.

Drawings

Fig. 1 is a flowchart illustrating a method performed by a user equipment according to an embodiment of the present invention.

Fig. 2 is a block diagram schematically illustrating a user equipment UE according to the present invention.

Detailed Description

The invention is described in detail below with reference to the figures and the detailed description. It should be noted that the present invention should not be limited to the specific embodiments described below. In addition, for the sake of brevity, detailed descriptions of well-known technologies not directly related to the present invention are omitted to prevent confusion of understanding of the present invention.

Some terms related to the present invention are described below, and specific meanings of the terms are described in the latest 3GPP standard specification.

UE: user Equipment

NR: new Radio New generation wireless technology

RRC: radio Resource Control

MAC: medium Access Control, medium Access Control

RRC _ CONNECTED: RRC connected state

RRC _ INACTIVE: RRC inactive state

RRC _ IDLE: RRC idle state

RAN: radio Access Network, radio Access Network

And (4) RSRP: reference Signal Receiving Power, reference Signal received Power

AS: access Stratum, access Stratum

PDCCH: physical downlink control channel, physical downlink control channel

BWP: bandwidth Part, bandwidth fragment

DCI: downlink Control Information, downlink Control Information

DL: downlink, downlink

IE: information Element, information Element

And (3) CE: control Element, control Element

MAC CE: MAC control element

PDU: protocol Data Unit

MAC PDU: MAC Protocol Data Unit, MAC Protocol Data Unit

MIB: master Information Block, master Information Block

SIB: system Information Block

RLM: radio Link Monitoring

BFD: beam Failure Detection, beam Failure Detection

RLF: radio Link Failure, radio Link Failure

BFR: beam Failure Recovery, beam Failure Recovery

BLER: block Error Rate, block Error Rate

RRM: radio Resource Management, radio Resource Management

Serving Cell: a PCell, a PSCell, or an SCell, serving cell, which may be PCell, PSCell or SCell

SpCell: the Special Cell may be a PCell or a PSCell.

A PCell: primary Cell, primary Cell

PSCell: primary SCG Cell, primary SCG Cell

SCell: secondary Cell, secondary Cell

SCG: secondary Cell Group, secondary Cell Group

C-RNTI: cell RNTI and Cell RNTI

RNTI: radio Network Temporary Identifier (RNTI)

HARQ: hybrid Automatic Repeat Request, hybrid Automatic Repeat Request retransmission

SINR: signal to Noise and Interference Ratio

DRB: (user) Data Radio Bearer, data Radio Bearer

MIMO: multiple-Input Multiple-Output

TRP: transmit/Receive Point transmitting/receiving port

TCI: transmission Configuration Indicator transmits a Configuration indication

SRS: sounding Reference Signal

CSI: channel-State Information Channel State Information

PDSCH: physical Downlink Shared Channel

PDCCH: physical Downlink Control Channel

PUSCH: physical Uplink Shared Channel

PUCCH: physical Uplink Control Channel

PCI: physical Cell Identifier Physical Cell identity

UL-SCH: uplink Shared Channel

Candidate RS ID: candidate reference signal identification

In the invention, a network, a base station and a RAN can be used interchangeably, and the network can be a Long Term Evolution (LTE) network, a New radio access technology (New RAT, NR) network, an enhanced long term evolution (eLTE) network or other networks defined in subsequent evolution versions of 3 GPP.

In the present invention, the UE may refer to an NR device supporting multi-beam enhancement, an NR device supporting multi-TRP enhancement, an NR device supporting femmimo, an NR device supporting SRS enhancement, an NR device supporting CSI measurement and report enhancement, or other types of NR devices or LTE devices.

Hereinafter, a description will be given of the related art of the present invention.

Beam Failure Detection (BFD) and Beam Failure Recovery (BFR) are performed in the RRC connected state. BFD is where the UE detects beam failure and recovers beam failure from the reference signals configured by the network. The BFD flow may include a SpCell and an SCell for each Serving Cell. The BFR flow includes, in addition to BFD, reporting to the network side of the occurrence or detection of a Beam failure event when a Beam failure occurs. The reference signals configured for the BFD (or BFR) procedure may be SSBs and/or CSI-RS. The reference signal is used for beam detection and may be referred to as reference beam.

In a multi-TRP scenario, there may be multiple TRPs in a cell, and the network may configure a reference signal or a set of reference signals for BFD and/or BFR for each TRP, which may or may not have an overlap therebetween. Each set of reference signals may be represented by an index, each index corresponding to a TRP. Such a cell may be referred to as a cell configured with TRP specific BFR. Each TRP may correspond to a reference signal collection.

When the UE detects that the downlink quality corresponding to a certain TRP is too low (as described above, or a new threshold value for determining the link quality may be defined), the physical layer reports an indication beam failure instance indication to the MAC layer. When the number of the accumulated indication BFIs (beam failure instance) reaches or exceeds the maximum value, the UE may determine that the transmission of the beam on the TRP fails, and further trigger the BFR procedure. And the UE can also detect a reference signal set for BFD and/or BFR corresponding to the TRP so as to find a candidate reference signal in beam failure.

When the MAC initiates a BFR procedure for the TRP, the UE may report the TRP information where the bead failure occurs and possible candidate reference information to the base station. This information may be carried in the MAC CE and transmitted to the base station. Such a MAC CE may be referred to as a TRP specific BFR MAC CE.

In addition, the serving cell of the UE may also be configured with a cell-level set of reference signals for BFD and/or BFR. Such a Cell may be referred to as a Cell configured with Cell specific BFR.

When the UE detects that the downlink quality corresponding to a certain cell is too low (as described above, or a new threshold value for determining the link quality may be defined), the physical layer reports an indication beam failure instance indication to the MAC layer. When the number of the accumulated indication BFIs (beam failure instance) reaches or exceeds the maximum value, the UE may determine that the transmission of the beam on the cell fails, and further trigger a BFR procedure. And the UE can also detect a reference signal set for BFD and/or BFR corresponding to the cell so as to find a candidate reference signal in beam failure.

In the procedure that the MAC initiates a BFR for the cell, the UE may report information of the cell where the bead failure occurs and candidate reference information that may exist to the base station. This information may be carried in the MAC CE and transmitted to the base station. Such a MAC CE may be referred to as a Cell specific BFR MAC CE.

If the number of reference signal sets configured for BFR is large, a cell configured with cell specific BFR is generally configured with only one set of reference signals (or one reference signal set); a cell configured with TRP specific BFR is configured with at least two sets of reference signals for BFR (or multiple sets of reference signals for BFR). Thus, the cell specific BFR and TRP specific BFR may be defined according to the number of reference signal sets configured for BFR. For example, a cell configured with only one set of reference signals for BFR corresponds to a cell configured with cell specific BFR; the cells configured with at least two sets of reference signals for BFRs correspond to cells configured with TRP specific BFRs. Such statements may be used interchangeably.

In the present invention, cancellation, release, deletion, purge, and the like may be substituted for each other. Execution, use, adoption, and application are interchangeable. The configuration and the reconfiguration may be mutually alternative. Indexes, indications, identifications, information, sequence numbers and numbers may be substituted for one another. The "set" and "set" may be substituted for each other.

The "UL-SCH resource" and the "UL assignment (grant)" may be replaced with each other. "TRP", "TRP index", "reference signal set index", "BFD reference signal set", "BFR reference signal set", "BFD reference signal set index", "BFR reference signal set index", "TCI", and "TCI state" may be substituted for each other. "TRP BFR MAC CE" may also have other names as long as it is a MAC CE for indicating the beam failure recovery of a certain TRP.

Hereinafter, several embodiments of the present invention for the above-described problems are described in detail.

Example 1

The present embodiment provides a method performed by a user equipment, which is a method for a UE to perform beam failure reporting, as shown in fig. 1, and includes the following steps:

s101: the UE generates an MAC CE for reporting the Cell specific beam failure information and the TRP specific beam failure information at the same time;

s102: the UE transmits the generated MAC CE to the base station.

In this embodiment, a MAC CE format is designed to simultaneously report Cell specific beam failure information and TRP specific beam failure information.

In this format, at least the fields Ci, TRP, AC, candidate RS ID, R are present.

Wherein Ci indicates the beam failure detection condition of the serving cell configured with the cell specific BFR, or indicates the beam failure detection condition of the serving cell configured with the TRP specific BFR.

Where i corresponds to the serving cell's serial number, e.g., C1 corresponds to the beam failure detection case of the serving cell numbered 1.

When Ci is set to 0, if the corresponding serving cell is configured with a cell specific BFR, it indicates that the serving cell does not detect beam failure; if the corresponding serving cell is configured with a TRP specific BFR, this indicates that no beam failure is detected on all TRPs of the serving cell that are configured, e.g., if the cell is configured with two TRPs, this indicates that no beam failure is detected on both TRPs.

Preferably, when Ci is configured to be 0, it may also indicate that evaluation of the candidate reference signal has not been completed although the corresponding serving cell detected the beam failure. Such a serving cell mainly refers to a serving cell configured with cell specific BFR.

For a serving cell configured with a TRP specific BFR, when the corresponding Ci is set to 0, any of the following information may be indicated:

no beam failure is detected on all TRPs configured for the serving cell;

detecting a beam failure on the configured at least one TRP of the serving cell, but the evaluation of the candidate reference signal has not been completed; no beam failure detected on other TRPs;

the beam failure is detected on all TRPs of the serving cell that are configured, but the evaluation of the candidate reference signals for all TRPs has not been completed.

When Ci is set to 1, if the corresponding serving cell is configured with a cell specific BFR, it indicates that the serving cell detects beam failure; if the corresponding serving cell is configured with a TRP specific BFR, it indicates that the beam failure is detected on at least one TRP on the serving cell, for example, the serving cell is configured with two TRPs, and Ci is set to 1 in the following cases:

wherein the beam failure is detected on one TRP, and the beam failure is not detected on the other TRP;

or the beam failure was detected on both TRPs.

Preferably, when Ci is set to 1, it may also indicate that the corresponding serving cell has detected beam failure and that the evaluation of the candidate reference signal (or candidate beam) has been completed and an AC field may occur. Such a serving cell mainly refers to a serving cell configured with a cell specific BFR. For a serving cell configured with a TRP specific BFR, when the corresponding Ci is set to 1, it may also indicate that a TRP field will occur and may indicate that a beam failure is detected on at least one TRP of the serving cell that is configured and that evaluation of candidate reference signals on the TRP has been completed.

For a Cifield set to 1, there is a corresponding byte or bytes (octets) in which the AC field, described below, may be contained, as well as the TRP field, and/or Candidate RS ID field.

Wherein for a serving Cell configured with Cell specific BFR, if its corresponding Ci field is set to 1, there is a corresponding byte containing at least AC field.

For a serving cell configured with TRP specific BFR, if the corresponding Cifield is set to 1, there is a corresponding byte at least containing TRP field, and the number of the byte does not exceed (is less than or equal to) the number of configured TRP.

This domain of TRP indicates the detection of beam failure on this TRP. For a serving cell configured with TRP specific BFR, there are bytes containing TRP field. And determining the number of bytes of TRP field according to the number of configured TRP. For example, two TRPs are configured in the serving cell UE, and when a certain TRP on the serving cell is detected as beam failure, two bytes containing TRP fields exist in the MAC CE corresponding to the serving cell. Wherein the first byte corresponds to the first TRP and the second byte corresponds to the second TRP. The UE may know the corresponding relationship between the bytes and the TRPs according to convention or pre-configuration. For example, the first byte may correspond to a TRP with number (index) 0, and the second byte may correspond to a TRP with number 1, or vice versa. If the number of TRPs exceeds two, the analogy can be made in a numbering way. Or when configuring related parameters of the TRP specific BFR, configuring one of the parameters as a primary TRP and the other one as a secondary TRP. Then the first byte may correspond to primary TRP and the second byte may correspond to secondary TRP.

The TRP field contained in this byte indicates the detection of the beam failure on its corresponding TRP.

Wherein when TRP is set to 0, then it indicates that no beam failure is detected on this TRP; conversely, when TRP is set to 1, it indicates that beam failure is detected on this TRP.

Preferably, when the TRP is set to 0, it may also indicate that evaluation of the candidate reference signal has not been completed although beam failure is detected on the TRP.

And preferably, when a TRP is set to 1, it may also indicate that a beam failure is detected on the TRP, and that evaluation of the candidate reference signal (or candidate beam) has been completed and an AC field will occur.

Further, when TRP is set to 0, the AC field in the same byte may be considered as not present or as a reserved bit, i.e. the bit does not indicate any information. The TRP field may also indirectly indicate whether an AC field is present in the current byte. Preferably, when TRP is set to 0, the value of AC field in this byte can be set to 0, and then the following Candidate RS IDfield will be considered as a reserved bit.

The AC field indicates whether a Candidate RS ID exists in the current byte. When at least one of the measured values of the reference signals in the candidate reference signal list is above a configured threshold (If at least one of the SSBs with SS-RSRP above rsp-threshold Bfr amplitude the SSBs in candidate BeamSCell or the CSI-RSs with CSI-RSP above rsp-threshold Bfr amplitude the CSI-RSs in candidate BeamSCell is available), the AC field is set to 1, otherwise, to 0.

The presence of a Candidate RS ID field is also indicated when the AC field is set to 1. If the AC field is set to 0, the byte in which the Candidate RS ID field is located is treated as a reserved bit.

Candidate RS ID: this field is set to the sequence number of the reference signal for which the measured value is above a configured threshold value. (This field is set to the index of an SSB with SS-RSRP above RSRP-ThresholdBfr amplitude st the SSBs in a truncated BeamSCell or to the index of a CSI-RS with CSI-RSRP above RSRP-ThresholdBfr amplitude st the CSI-RSs in a truncated BeamSCell. Index of an SSB or CSI-RS is the index of an entry of a truncated BeamSCSCell or CSI-RS).

The rfield is a reserved bit, usually set to 0.

In this context, for example, these fields are set to 0 or 1 in different cases, and accordingly can also be set to 1 or 0 in corresponding cases, or to "yes" and "no", without being limited thereto. Furthermore, depending on the reporting situation, the fields TRP, AC, candidate RS ID, R may not always be present. In a special case, for example, when the UE generates the MAC CE, the cell detected with beam failure has not completed the measurement of the candidate reference signal, and then only the field is included in the reported MAC CE, and the values of the field are all set to "0". For another example, when the UE generates the MAC CE, the cell in which the beam failure is detected is a cell configured with cell specific BFR, and then the MAC CE reported at this time includes AC field in addition to Ci field, and possibly Candidate RS ID but not TRP field.

These field possible distributions are shown in table 1 below, where 32 serving cells are taken as an example.

[ Table 1]

The field distributions may also be as shown in table 2 below.

[ Table 2]

Depending on the configuration of the serving cell, there may be one byte for each cell, and the byte contains at least the AC field. There are cells that can correspond to a plurality of bytes, and the bytes at least include TRP field. The BFR MAC CE is thus of variable length. In the foregoing example, the first four bytes are always present, and the detection situation according to the configuration situation of the serving cell, and beam failure occurs from the fifth byte. The fifth byte always corresponds to the index of the serving cell with the smallest value of i with Ci field set to 1. Then in ascending order of the value of i, the next byte corresponds to the index of the serving cell in Cifield set to 1.

For example: the serving cell-1 corresponding to C1 is configured with a cell specific beam failure detection parameter, and the number of the detected candidate beam ID is 000001.

The serving cell-2 corresponding to C2 is configured with two sets of TRP specific beam failure detection parameters.

At some point the UE detects a beam failure for the serving cell-1 and a beam failure corresponding to the first TRP of the serving cell-2, and there are no candidate beams on the first TRP that satisfy the condition.

Based on this situation, the byte stuffing of the MAC CE is shown in table 3 below.

[ Table 3]

0	0	0	0	0	1(note 2)	1(note 1)	0
								0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	0
								0	0	0	0	0	0	0	0
1(note 3)	0(note 4)	0	0	0	0	0	1(note 5)
								1(note 6)	0(note 7)	0	0	0	0	0	0(note 8)
0(note 9)	0(note 10)	0	0	0	0	0	0(note 11)

Note 1: a value of 1 indicates that the serving cell corresponding to C1 detects beam failure

Note 2: a value of 1 indicates that the serving cell corresponding to C2 detects a beam failure

The fifth byte corresponds to the number of the first beam failure detected serving cell, here C1.

Note3: a value of 1 indicates the presence of a candidate beam

Note 4: for reserving bits

Note 5: index of candidate beam is 000001

The sixth and seventh bytes correspond to the number of the second serving cell, here C2, for which beam failure was detected, and two bytes correspond to this since the cell is configured with two TRPs.

Note6: the value of 1 represents that the first TRP detects the beam failure

Note 7: a value of 0 indicates that there is no candidate beam

Note 8: for reserving bits

Note 9: a value of 0 indicates that no beam failure is detected by the second TRP

Note 10: for bit reservation, or AC field set to 0

Note 11: for reserving bits

The MAC CE is 7 bytes in length.

Furthermore, to distinguish between AC fields, AC fields that appear with TRP fields may also be named AC-TRP fields, which only appear when TRP field is set to "1".

When the TRP is set to 0, the AC-TRP field in the same byte can be considered as absent or as a reserved bit, i.e. the bit does not indicate any information. The TRP field may also indirectly indicate whether an AC-TRP field is present in the current byte. Preferably, when TRP is set to 0, the value of AC-TRP field in this byte can be set to 0, and the next Candidate RS IDfield will be treated as a reserved bit.

The AC-TRP field indicates whether a Candidate RS ID exists in the current byte. When at least one of the measured values of the reference signals in the candidate reference signal list is above a configured threshold (If at least one of the SSBs with SS-RSRP above rsp-threshold Bfr amplitude the SSBs in candidate BeamSCell or the CSI-RSs with CSI-RSP above rsp-threshold Bfr amplitude the CSI-RSs in candidate BeamSCell is available), the AC field is set to 1, otherwise, to 0.

The presence of the Candidate RS ID field is also indicated when AC-TRP field is set to 1. If the AC field is set to 0, the byte in which the Candidate RS ID field is located is treated as a reserved bit.

Table 4 illustrates possible distributions of AC-TRP field.

[ Table 4]

Example 2

In this embodiment, the UE generates two different MAC CEs, cell specific BFR MAC CE and TRP specific BFR MAC CE. When the MAC PDU package is carried out, the UE can firstly place the Cell specific BFR MAC CE in the MAC PDU, and then if the remaining space is enough to contain the TRP specific BFR MAC CE, the UE places the TRP specific BFR MAC CE in the same MAC PDU. If there is no remaining space, or the remaining space is not enough to accommodate the TRP specific BFR MAC CE, then the UE no longer places the TRP specific BFR MAC CE in the same MAC PDU.

And after the MAC PDU assembly is completed, the UE sends the MAC PDU to the base station.

Yet another embodiment of the above operation may be that the UE performs an operation that the packet priority of the Cell specific BFR MAC CE is always higher than that of the TRP specific BFR MAC CE during the MAC PDU grouping process.

In special cases, for example, spcell (Pcell or Pscell) is configured with TRP specific BFR. Then, when the generated TRP specific BFR MAC CE includes the beam failure information of the TRP of the scell, the UE may consider that the packet priority of the TRP specific BFR MAC CE is higher than that of the Cell specific BFR MAC CE in such a case.

The specific operation may be that when the UE performs MAC PDU grouping, for the Cell specific BFR MAC CE and the TRP specific BFR MAC CE which are generated simultaneously or need to be transmitted,

if the TRP specific BFR MAC CE contains the beam failure information of the TRP of the scell, the UE may first place the TRP specific BFR MAC CE in the MAC PDU, and then, if there is a remaining space and the remaining space is sufficient to accommodate the Cell specific BFR MAC CE, the UE places the Cell specific BFR MAC CE in the same MAC PDU.

If the TRP specific BFR MAC CE does not contain the beam failure information of the TRP of the scell, the UE may first place the Cell specific BFR MAC CE in the MAC PDU when performing MAC PDU packing, and then place the TRP specific BFR MAC CE in the same MAC PDU if there is remaining space and the remaining space is sufficient to accommodate the TRP specific BFR MAC CE.

Example 3

In embodiment 1, it is mentioned that when configuring relevant parameters of the TRP specific BFR, one of them may be configured as a primary TRP, and the other may be configured as a secondary TRP. In order to achieve UE energy saving, when the UE is configured with Discontinuous Reception (DRX), for a serving cell, especially a primary serving cell, configured with at least 2 TRP specific BFR related parameters, if the UE is in an active state (active), the UE may perform BFR related detection, reporting, etc. on all configured TRPs; if the UE is in an inactive state (inactive), the UE may perform BFR related detection, reporting, etc. operations only on primary TRP.

It is also possible to operate according to the corresponding sequence number of the TRP. When the UE is configured with Discontinuous Reception (DRX), for a serving cell, in particular a primary serving cell, configured with at least 2 TRP specific BFR related parameters, if the UE is in an active state (active), the UE may perform BFR related detection, reporting, etc. on all configured TRPs; if the UE is in an inactive state (inactive), the UE may perform BFR related detection, reporting, etc. operations only on TRPs with specified sequence numbers. The TRP of the designated sequence number may be a TRP with a sequence number of 0 or a TRP corresponding to a sequence number that is configured or indicated in advance.

Fig. 2 is a block diagram schematically illustrating a user equipment UE according to the present invention. As shown in fig. 2, the user equipment UE200 includes a processor 201 and a memory 202. The processor 201 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like. The memory 202 may include, for example, volatile memory (e.g., random access memory RAM), a Hard Disk Drive (HDD), non-volatile memory (e.g., flash memory), or other memory, among others. The memory 202 has stored thereon program instructions. The instructions, when executed by the processor 201, may perform the above-described method performed by the user equipment as described in detail herein.

The program running on the apparatus according to the present invention may be a program that causes a computer to realize the functions of the embodiments of the present invention by controlling a Central Processing Unit (CPU). The program or information processed by the program may be temporarily stored in a volatile memory (such as a random access memory RAM), a Hard Disk Drive (HDD), a nonvolatile memory (such as a flash memory), or other memory system.

A program for implementing the functions of the embodiments of the present invention may be recorded on a computer-readable recording medium. The corresponding functions can be realized by causing a computer system to read the programs recorded on the recording medium and execute the programs. The term "computer system" as used herein may be a computer system embedded in the device and may include an operating system or hardware (e.g., peripheral devices). The "computer-readable recording medium" may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium that stores a program for short-term dynamics, or any other recording medium that is readable by a computer.

Various features or functional blocks of the devices used in the above-described embodiments may be implemented or performed by circuitry (e.g., a single or multiple chip integrated circuits). Circuitry designed to perform the functions described herein may include a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The circuit may be a digital circuit or an analog circuit. Where new integrated circuit technologies have emerged as a replacement for existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present invention may also be implemented using these new integrated circuit technologies.

Further, the present invention is not limited to the above-described embodiments. While various examples of the embodiments have been described, the present invention is not limited thereto. Fixed or non-mobile electronic devices installed indoors or outdoors may be used as terminal devices or communication devices, such as AV devices, kitchen devices, cleaning devices, air conditioners, office devices, vending machines, and other home appliances.

As above, the embodiments of the present invention have been described in detail with reference to the accompanying drawings. However, the specific configuration is not limited to the above embodiment, and the present invention includes any design modification without departing from the gist of the present invention. In addition, the present invention can be variously modified within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the different embodiments are also included in the technical scope of the present invention. Further, components having the same effects described in the above embodiments may be substituted for each other.

Claims

1. A method performed by User Equipment (UE) is a method for the UE to perform beam failure reporting, and comprises the following steps:

the UE transmits the generated MAC CE to the base station,

wherein, the MAC CE has fields Ci, TRP, AC, candidate RS ID and R,

ci: this field indicates a beam failure detection situation of the serving cell configured with cell-specific BFR, or indicates a beam failure detection situation of the serving cell configured with TRP-specific BFR, where i corresponds to the sequence number of the serving cell;

TRP: this field indicates the detection of a beam failure on this TRP;

AC: this field indicates whether a Candidate RS ID exists in the current byte;

candidate RS ID: this field is set to the sequence number of the reference signal whose measurement value is above a configured threshold value;

r: this field is reserved bits.

2. The method performed by a user equipment of claim 1,

when Ci is set to 0, if the corresponding serving cell is configured with a cell-specific BFR, it indicates that the serving cell has not detected a beam failure; if the corresponding serving cell is configured with a TRP-specific BFR, then it indicates that no beam failure is detected on all TRPs of the serving cell that are configured;

when Ci is set to 1, if the corresponding serving cell is configured with a cell-specific BFR, it indicates that the serving cell has failed to detect a beam; if the corresponding serving cell is configured with TRP-specific BFR, it indicates that the beam failure is detected on at least one TRP on the serving cell.

3. The method performed by the user equipment of claim 2,

for a serving cell configured with cell-specific BFR, if its corresponding Ci field is set to 1, there is a corresponding byte containing at least AC field;

4. The method performed by a user equipment according to any one of claims 1 to 3,

when the TRP field is set to 0, it indicates that no beam failure is detected on this TRP;

when the TRP field is set to 1, it indicates that a beam failure is detected on this TRP.

5. The method performed by a user equipment according to any one of claims 1 to 3,

6. The method performed by a user equipment according to any one of claims 1 to 3,

7. The method performed by the user equipment according to any of claims 1-3, further comprising the steps of:

the UE performs MAC PDU packet packing; and

8. The method performed by the user equipment of claim 7,

9. The method performed by the user equipment of claim 8,

when the special cell is configured with the TRP-specific BFR, if the generated TRP-specific BFR MAC CE includes beam failure information of the TRP of the special cell, the UE performs an operation in which a packet priority of the TRP-specific BFR MAC CE is higher than a packet priority of the cell-specific BFR MAC CE.

10. A user equipment, comprising:

a processor; and

a memory having stored therein, a set of instructions,

the instructions, when executed by the processor, cause the user equipment to perform the method of any of claims 1-9.