Network assisted sidelink beam failure recovery

Patent metadata

Field	Value
Publication number	US-11916726-B2
Application number	US-202117336115-A
Country	US
Kind code	B2
Filing date	Jun 1, 2021
Priority date	Jul 2, 2020
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

A method of wireless communication by a first sidelink user equipment (UE) transmits a sidelink (SL) beam failure recovery (BFR) message to a communications node, indicating a new candidate beam and an identifier (ID) of a second sidelink UE. The method also receives an acknowledgment of the SL BFR message. A communications node receives a sidelink beam failure recovery message from a first sidelink user equipment, indicating a new candidate beam and an ID of a second sidelink UE. The method also transmits information identifying the new candidate beam and the ID to the second sidelink UE. Another method by a first sidelink user equipment receives a sidelink beam failure recovery message from a base station, indicating a new candidate beam and an ID of a second sidelink UE. The method changes a beam used to communicate with the second sidelink UE in response to receiving the BFR message.

First claim

What is claimed is:

1. A method of wireless communication by a first sidelink user equipment (UE), comprising:
transmitting a sidelink (SL) beam failure recovery (BFR) message to a communications node, indicating a new candidate beam and an identifier (ID) of a second sidelink UE; and
receiving an acknowledgment of the SL BFR message, the acknowledgment indicating that information in the SL BFR message was transmitted to the second sidelink UE.

2. The method of claim 1 , wherein the communications node is a base station.

3. The method of claim 2 , wherein the acknowledgment indicates the second sidelink UE successfully received the SL BFR message from the base station.

4. The method of claim 2 , further comprising:
transmitting a sidelink link recovery request (SL-LRR) to the base station; and
receiving an uplink grant for the SL BFR message.

5. The method of claim 4 , further comprising transmitting the SL-LRR to the base station on a physical uplink control channel (PUCCH).

6. The method of claim 2 , wherein the new candidate beam corresponds to a sidelink synchronization signal block (SSB) ID or a sidelink channel state information reference signal (CSI-RS) ID.

7. The method of claim 2 , wherein the SL BFR message is carried in a media access control-control element (MAC-CE).

8. The method of claim 2 , wherein the acknowledgment comprises a physical downlink control channel (PDCCH).

9. The method of claim 1 , wherein the communications node is a third sidelink UE.

10. The method of claim 9 , wherein the acknowledgment indicates the second sidelink UE successfully received the SL BFR message from the third sidelink UE.

11. A method of wireless communication by a communications node, comprising:
receiving a sidelink (SL) beam failure recovery (BFR) message from a first sidelink user equipment (UE), indicating a new candidate beam and an identifier (ID) of a second sidelink UE;
transmitting information identifying the new candidate beam and the ID to the second sidelink UE; and
transmitting, to the first sidelink UE, a response to the SL BFR message in response to receiving an acknowledgement from the second sidelink UE.

12. The method of claim 11 , further comprising transmitting the response to the SL BFR message over a physical downlink control channel (PDCCH).

13. The method of claim 12 , further comprising transmitting the response to the SL BFR message with the PDCCH scrambled by a cell radio network temporary identifier (C-RNTI) associated with the first sidelink UE.

14. The method of claim 11 , further comprising transmitting the response in accordance with a hybrid automatic repeat request (HARQ) process corresponding to the SL BFR message.

15. The method of claim 11 , wherein the communications node is a base station.

16. The method of claim 15 , wherein the base station comprises a primary cell or a secondary cell.

17. The method of claim 11 , wherein the communications node is a third sidelink UE.

18. The method of claim 17 , further comprising transmitting, to the first sidelink UE, a response to the SL BFR message in response to receiving an acknowledgement from the second sidelink UE.

19. The method of claim 11 , further comprising:
receiving a beam failure detection (BFD) message from the first sidelink UE, the BFD message including an ID of the second sidelink UE; and
transmitting the BFD message to the second sidelink UE, triggering the second sidelink UE to transmit reference signals listed in a sidelink candidate beam reference signal list.

20. An apparatus for wireless communications by a communications node, comprising:
a processor;
memory coupled with the processor; and
instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
receive a sidelink (SL) beam failure recovery (BFR) message from a first sidelink user equipment (UE), indicating a new candidate beam and an identifier (ID) of a second sidelink UE;
transmit information identifying the new candidate beam and the ID to the second sidelink UE; and
transmit, to the first sidelink UE, a response to the SL BFR message in response to receiving an acknowledgment from the second sidelink UE.

21. The apparatus of claim 20 , wherein the communications node is a base station.

22. The apparatus of claim 20 , wherein the communications node is a third sidelink UE.

23. The apparatus of claim 20 , wherein the processor causes the apparatus to:
receive a beam failure detection (BFD) message from the first sidelink UE, the BFD message including an ID of the second sidelink UE; and
transmit the BFD message to the second sidelink UE, triggering the second sidelink UE to transmit reference signals listed in a sidelink candidate beam reference signal list.

Assignees

• Qualcomm Inc

Inventors

• Ryu Jung Ho
• Akkarakaran Sony
• Luo Tao
• Li Junyi
• Damnjanovic Jelena
• Zhang Xiaoxia
• Montojo Juan
• Ding Ling

Classifications

• H04B7/06964

  Re-selection of one or more beams after beam failure · CPC title

• H04B7/06954

  Sidelink beam training with support from third instance, e.g. the third instance being a base station · CPC title

• H04L41/0668 Primary

  by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure · CPC title

• H04L1/1812

  Hybrid protocols; Hybrid automatic repeat request [HARQ] · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title