# US 11,444,675 B2 · Beam failure recovery request transmission method, reception method, devices and system

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- Number: US 11,444,675 B2
- Document ID: US11444675B2
- Status: Granted
- Kind: B2
- Application number: 16/760,116
- Filed: 2018-10-10
- Published: 2020-08-13
- Granted: 2022-09-13
- Earliest claimed: 2017-11-17
- Assignees: Vivo Mobile Communication Co., Ltd.
- Applicants: Vivo Mobile Communication Co., Ltd.
- Inventors: Yu Yang; Peng Sun; Jingzhi Ma
- Web page: https://patentgrep.com/patent/US11444675B2

## CPC

- H04B 7/06964: {Re-selection of one or more beams after beam failure}
- H04W 76/19: Connection re-establishment
- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04B 7/0639: {Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection}
- H04W 16/28: using beam steering
- H04W 24/08: Testing, {supervising or monitoring} using real traffic
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04W 48/16: Discovering, processing access restriction or access information
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A beam failure recovery request transmission method, reception method, devices, and systems relating to a communication technology field are provided to solve a problem that UE cannot transmit a beam failure recovery request to a base station when UE detects failure of only parts of PDCCH beams, resulting that beam failure cannot be recovered in time. The transmission method performed by UE includes: detecting whether each of all PDCCH beams fails, the all PDCCH beams being configured by base station for UE to monitor; if UE determines that the quantity of failed PDCCH beams is within a preset range greater than 0 and less than a total quantity of all PDCCH beams, transmitting a first beam failure recovery request to base station; if UE determines failure of all PDCCH beams, transmitting a second beam failure recovery request different from the first beam failure recovery request to base station.

## Claims

### Claim 1

A beam failure recovery request transmission method, comprising:
detecting, by user equipment (UE), whether each physical downlink control channel (PDCCH) beam of all PDCCH beams fails, wherein the all PDCCH beams are PDCCH beams configured by a base station for the UE to monitor;
if the UE determines that a quantity of PDCCH beams that fail is within a preset range, transmitting, by the UE, a first beam failure recovery request to the base station, wherein the preset range is greater than 0 and less than a total quantity of the all PDCCH beams;
if the UE determines that the all PDCCH beams fail, transmitting, by the UE, a second beam failure recovery request to the base station,
wherein the second beam failure recovery request is different from the first beam failure recovery request,
wherein both the first beam failure recovery request and the second beam failure recovery request comprise indication information for indicating a message type of a report message, the indication information comprises a signaling bit added in uplink control information (UCI) or an unused state of a signaling bit in the UCI; and the indication information in the first beam failure recovery request in different from the indication information in the second beam failure recovery request.

### Claim 2 (depends on 1)

The beam failure recovery request transmission method according to claim 1, wherein a reference signal of the each PDCCH beam is detected by the UE to determine whether the each PDCCH beam fails, and the reference signal is a beam failure detection reference signal, a reference signal for beam measurement in beam management, or a reference signal for channel state information (CSI) measurement.

### Claim 3 (depends on 1)

The beam failure recovery request transmission method according to claim 1, wherein the first beam failure recovery request is transmitted on a first uplink resource, the second beam failure recovery request is transmitted on a second uplink resource,
the first uplink resource, the second uplink resource and a designated uplink resource are different from each other, and the designated uplink resource comprises uplink resources for transmitting a beam report and uplink resources for transmitting a CSI report.

### Claim 4 (depends on 1)

The beam failure recovery request transmission method according to claim 1, wherein at least one group of uplink resources is selected by the UE from the uplink resources for transmitting the beam report and the uplink resources for transmitting the CSI report in accordance with a first preset rule to transmit a beam failure recovery request to the base station, and the beam failure recovery request is the first beam failure recovery request or the second beam failure recovery request.

### Claim 5 (depends on 4)

The beam failure recovery request transmission method according to claim 4, wherein the first preset rule comprises:
selecting all the uplink resources for transmitting the beam report and/or all the uplink resources for transmitting the CSI report; or,
selecting closest available uplink resources from the uplink resources for transmitting the beam report and/or the uplink resources for transmitting the CSI report; or,
selecting uplink resources with a shortest period from the uplink resources for transmitting the beam report and/or the uplink resources for transmitting the CSI report; or,
selecting uplink resources whose signaling bit lengths are closest to a signaling bit length of the beam failure recovery request from the uplink resources for transmitting the beam report and/or the uplink resources for transmitting the CSI report; or,
selecting uplink resources whose indices meet a preset condition from the uplink resources for transmitting the beam report and/or the uplink resources for transmitting the CSI report.

### Claim 6 (depends on 1)

The beam failure recovery request transmission method according to claim 1, wherein the second beam failure recovery request is transmitted by the UE to the base station through at least one of a physical uplink control channel (PUCCH) and a physical random access channel (PRACH) in accordance with a second preset rule.

### Claim 7 (depends on 6)

The beam failure recovery request transmission method according to claim 6, wherein the second preset rule comprises:
if a quantity of signaling bits of the second beam failure recovery request is greater than a first threshold, transmitting the second beam failure recovery request to the base station through the PUCCH, if the quantity of signaling bits of the second beam failure recovery request is less than or equal to the first threshold, transmitting the second beam failure recovery request to the base station through the PRACH; or,
if it is determined that the PUCCH is available currently, transmitting the second beam failure recovery request to the base station through the PUCCH, if it is determined that the PUCCH is unavailable currently, transmitting the second beam failure recovery request to the base station through the PRACH; or,
transmitting the second beam failure recovery request to the base station through the PUCCH and the PRACH.

### Claim 8 (depends on 1)

The beam failure recovery request transmission method according to claim 1, wherein the first beam failure recovery request comprises at least one of: identifiers of one or more PDCCH beams that fail, quality information about the one or more PDCCH beams that fail, identifiers of one or more downlink beams whose qualities meet a preset condition, or quality information about the one or more downlink beams whose qualities meet the preset condition.

### Claim 9 (depends on 8)

The beam failure recovery request transmission method according to claim 8, wherein a quantity of the downlink beams whose qualities meet the preset condition is configured by the base station for the UE.

### Claim 10 (depends on 8)

The beam failure recovery request transmission method according to claim 8, wherein the downlink beam whose quality meets the preset condition is determined by the UE through measuring a beam failure detection reference signal, a reference signal for beam measurement in beam management, or a reference signal for candidate beam identification.

### Claim 11 (depends on 1)

The beam failure recovery request transmission method according to claim 1, wherein the second beam failure recovery request comprises:
an identifier of a candidate beam determined by the UE; or,
the identifier of the candidate beam determined by the UE and quality information about the candidate beam.

### Claim 12

A beam failure recovery request reception method, comprising:
receiving, by a base station, a report message from user equipment (UE);
determining, by the base station, a message type of the report message in accordance with the report message,
wherein the message type of the report message comprises a first beam failure recovery request transmitted by the UE to the base station when a quantity of physical downlink control channel (PDCCH) beams that fail is within a preset range and a second beam failure recovery request transmitted by the UE to the base station when all PDCCH beams fail, the preset range is greater than 0 and less than a total quantity of the all PDCCH beams, and the first beam failure recovery request is different from the second beam failure recovery request;
wherein both the first beam failure recovery request and the second beam failure recovery request comprise indication information, the message type of the report message is determined by the base station in accordance with the indication information in the report message;
the indication information is used to indicate the message type of the report message, the indication information comprises a signaling bit added in uplink control information (UCI) or an unused state of signaling bit in the UCI, and the indication information in the first beam failure recovery request is different from the indication information in the second beam failure recovery request.

### Claim 13 (depends on 12)

The beam failure recovery request reception method according to claim 12, wherein uplink resources used by the first beam failure recovery request, the second beam failure recovery request and a designated report message are different from each other, the message type of the report message is determined by the base station in accordance with an uplink resource on which the report message is received, and the designated report message comprises a beam report and a channel state information (CSI) report.

### Claim 14 (depends on 12)

The beam failure recovery request reception method according to claim 12, wherein message formats of the first beam failure recovery request, the second beam failure recovery request and a designated report message are different from each other, the message type of the report message is determined by the base station in accordance with the message format of the report message, and the designated report message comprises a beam report and a CSI report.

### Claim 15

User equipment (UE), comprising a processor, a storage, and a computer program stored in the storage and configured to be executed by the processor, wherein the processor is configured to execute the computer program, to implement following steps:
detecting whether each physical downlink control channel (PDCCH) beam of all PDCCH beams fails, wherein the all PDCCH beams are PDCCH beams configured by a base station for the UE to monitor;
if it is determined that a quantity of PDCCH beams that fail is within a preset range, transmitting a first beam failure recovery request to the base station, wherein the preset range is greater than 0 and less than a total quantity of the all PDCCH beams;
if it is determined that the all PDCCH beams fail, transmitting a second beam failure recovery request to the base station,
wherein the second beam failure recovery request is different from the first beam failure recovery request;
wherein both the first beam recovery requestand the second beam failure recovery request comprise indication information for indicating a message type of a report message, the indication information comprises a signaling bit added in uplink control information (UCI) or an unused state of a signaling bit in the UCI; and the indication information in the first beam failure revoery request is different from the indication information in the second beam failure recovery request.

### Claim 16 (depends on 12)

A base station, comprising a processor, a storage, and a computer program stored in the storage and configured to be executed by the processor, wherein the processor is configured to execute the computer program, to implement steps of the beam failure recovery request reception method according to claim 12.

### Claim 17 (depends on 1)

A non-transitory computer-readable storage medium storing therein a computer program, wherein the computer program is configured to be executed by a processor, to implement steps of the beam failure recovery request transmission method according to claim 1.

### Claim 18 (depends on 12)

A non-transitory computer-readable storage medium storing therein a computer program, wherein the computer program is configured to be executed by a processor, to implement steps of the beam failure recovery request reception method according to claim 12.