# US 2025/0097808 A1 · Method performed by user equipment and user equipment

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- Number: US 2025/0097808 A1
- Document ID: US20250097808A1
- Status: Published application
- Kind: A1
- Application number: 18/294,146
- Filed: 2022-08-02
- Published: 2025-03-20
- Earliest claimed: 2021-08-04
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: LEI LIU; RENMAO LIU
- Web page: https://patentgrep.com/patent/US20250097808A1

## CPC

- H04W 36/305: {Handover due to radio link failure (control signalling for hand-off failure H04W36/0079)}
- H04W 76/19: Connection re-establishment
- H04B 7/06964: {Re-selection of one or more beams after beam failure}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION

## Abstract

Provided in the present invention are a method performed by user equipment and user equipment. A method performed by user equipment, including: receiving, by user equipment, a configuration by a network for a beam failure recovery procedure/parameter of each transmit/receive point of a serving cell; and for each transmit/receive point configured with a reference signal set for beam failure detection and/or beam failure recovery, if a medium access control entity receives a beam failure instance of a physical layer indicating the transmit/receive point, and if the medium access control entity considers that a beam failure has occurred at the transmit/receive point, initiating, according to a beam failure detection and recovery situation of another transmit/receive point in the serving cell, a random access procedure or a sounding reference procedure to perform beam failure recovery.

## Claims

### Claim at position 1

1-10. (canceled)

### Claim 11

User Equipment (UE), comprising:
a processor;
a memory, wherein instructions stored in the memory are executable to:
trigger a beam failure recovery (BFR) for a beam failure detection (BFD)-reference signal (RS) set of a serving cell; and
in a case where a medium access control (MAC) PDU is transmitted and the MAC PDU includes a BFR MAC control element (CE) or a truncated BFR MAC CE which contains beam failure recovery information of a BFD-RS set of a secondary cell (SCell), cancel all BFRs triggered for the BFD-RS set of the SCell.

### Claim 12 (depends on 11)

User Equipment (UE) according to claim 11, wherein the instructions are further executable to:
if a beam failure recovery procedure determines that at least one BFR for a BFD-RS set has been triggered and not cancelled for an SCell for which evaluation of candidate beams has been completed and if an available uplink shared channel (UL-SCH) resource cannot accommodate the BFR MAC CE plus a subheader of the BFR MAC CE, trigger a scheduling request (SR) for beam failure recovery of the BFD-RS set.

### Claim 13 (depends on 11)

User Equipment (UE) according to claim 11, wherein the instructions are further executable to:
if a special cell (SpCell) is configured with two BFD-RS sets and if a BFR is triggered for both of the two BFD-RS sets of the SpCell and a beam failure recovery procedure is not successfully completed for one of the two BFD-RS sets, initiate a random access procedure.

### Claim 14

A method performed by User Equipment (UE), comprising:
triggering a beam failure recovery (BFR) for a beam failure detection (BFD)-reference signal (RS) set of a serving cell; and
in a case where a medium access control (MAC) PDU is transmitted and the MAC PDU includes a BFR MAC control element (CE) or a truncated BFR MAC CE which contains beam failure recovery information of a BFD-RS set of a secondary cell (SCell), canceling all BFRs triggered for the BFD-RS set of the SCell.