Beam failure recovery in millimeter wave systems with network assisted user equipment cooperation
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may detect a beam failure associated with a millimeter wave link between the first UE and a base station; and transmit, to a second UE and via a millimeter wave link between the first UE and the second UE, a communication associated with performing a beam failure recovery (BFR) for the millimeter wave link between the first UE and the base station, wherein the second UE is capable of communicating with the base station via a millimeter wave link between the second UE and the base station. Numerous other aspects are provided.
1. A method of wireless communication performed by a first user equipment (UE), comprising:
detecting a beam failure associated with a millimeter wave link between the first UE and a base station (BS); and
transmitting, to a second UE and via a millimeter wave link between the first UE and the second UE, a communication associated with performing a beam failure recovery (BFR) for the millimeter wave link between the first UE and the BS,
wherein the second UE is capable of communicating with the BS via a millimeter wave link between the second UE and the BS, and
wherein the communication includes information regarding a switch to an alternate beam pair to be used in association with performing the BFR for the millimeter wave link between the first UE and the BS.
2. The method of claim 1 , further comprising establishing the millimeter wave link between the first UE and the second UE.
3. The method of claim 1 , wherein the communication includes information indicating the beam failure associated with the millimeter wave link between the first UE and the BS.
4. The method of claim 1 , wherein the communication is transmitted to the second UE based at least in part on identifying a maximum permissible exposure (MPE) constraint associated with the alternate beam pair.
5. The method of claim 4 , wherein the communication is transmitted with a reduced transmit power based at least in part on identifying the MPE constraint.
6. The method of claim 1 , wherein the communication includes information that identifies a set of candidate beam pairs, associated with performing the BFR, identified by the first UE.
7. The method of claim 1 , wherein the communication is transmitted to the second UE based at least in part on unsuitability of alternate beam pairs, associated with performing the BFR, being identified by the first UE.
8. The method of claim 1 , wherein the communication includes a request to terminate the millimeter wave link between the first UE and the BS.
9. The method of claim 1 , wherein the second UE is one of a set of UEs with which the first UE has established a millimeter wave link.
10. The method of claim 1 , wherein the first UE and the second UE are configured to communicate according to a protocol associated with network assisted UE cooperation, a protocol associated with network controlled interactive services, or a protocol associated with millimeter wave relaying.
11. The method of claim 1 , wherein a response is received from the second UE via the millimeter wave link between the first UE and the second UE,
wherein the response is provided by the BS.
12. The method of claim 11 , wherein the response includes information associated with terminating the millimeter wave link between the first UE and the BS.
13. The method of claim 11 , wherein the response includes information associated with an allocation of reference signal resources to the first UE in association with performing alternate beam pair identification.
14. The method of claim 11 , wherein the response includes a beam pair switching message.
15. A method of wireless communication performed by a second user equipment (UE), comprising:
receiving, from a first UE and via a millimeter wave link between the first UE and the second UE, a communication associated with performing a beam failure recovery (BFR) for a millimeter wave link between the first UE and a base station (BS); and
transmitting the communication via a millimeter wave link between the second UE and the BS,
wherein the communication includes information regarding a switch to an alternate beam pair to be used in association with performing the BFR for the millimeter wave link between the first UE and the BS.
16. The method of claim 15 , further comprising establishing the millimeter wave link between the first UE and the second UE.
17. The method of claim 15 , wherein the communication includes at least one of:
information indicating a beam failure associated with the millimeter wave link between the first UE and the BS,
information that identifies a set of candidate beam pairs, associated with performing the BFR, identified by the first UE, or
a request to terminate the millimeter wave link between the first UE and the BS.
18. The method of claim 15 , wherein the second UE is one of a set of UEs with which the first UE has established a millimeter wave link.
19. The method of claim 15 , wherein the first UE and the second UE are configured to communicate according to a protocol associated with network assisted UE cooperation, a protocol associated with network controlled interactive services (NCIS), or a protocol associated with millimeter wave relaying.
20. The method of claim 15 , wherein a response is received from the BS via the millimeter wave link between the second UE and the BS.
21. The method of claim 20 , wherein the response is transmitted to the first UE via the millimeter wave link between the first UE and the second UE.
22. The method of claim 20 , wherein the response includes at least one of:
information associated with terminating the millimeter wave link between the first UE and the BS, or
information associated with an allocation of reference signal resources to the first UE in association with performing alternate beam pair identification.
23. A method of wireless communication performed by a base station (BS), comprising:
receiving, a communication associated with performing a beam failure recovery (BFR) for a millimeter wave link between a first user equipment (UE) and the BS,
wherein the communication is received via a millimeter wave link between a second UE and the BS; and
transmitting, based at least in part on the communication, a response associated with performing the BFR for the millimeter wave link between the first UE and the BS,
wherein the response is transmitted via the millimeter wave link between the second UE and the BS, and
wherein the second UE is capable of communicating with the first UE via a millimeter wave link between the second UE and the first UE, and
wherein the communication includes information regarding a switch to an alternate beam pair to be used in association with performing the BFR for the millimeter wave link between the first UE and the BS.
24. The method of claim 23 , wherein the communication includes at least one of:
information indicating a beam failure associated with the millimeter wave link between the first UE and the BS,
information that identifies a set of candidate beam pairs, associated with performing the BFR, identified by the first UE, or
a request to terminate the millimeter wave link between the first UE and the BS.
25. The method of claim 23 , wherein the second UE is one of a set of UEs with which the first UE has established a millimeter wave link.
26. The method of claim 23 , wherein the first UE and the second UE are configured to communicate according to a protocol associated with network assisted UE cooperation, a protocol associated with network controlled interactive services (NCIS), or a protocol associated with millimeter wave relaying.
27. The method of claim 23 , wherein the response includes at least one of:
information associated with terminating the millimeter wave link between the first UE and the BS, or
information associated with an allocation of reference signal resources to the first UE in association with performing alternate beam pair identification.
28. A first user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to:
detect a beam failure associated with a millimeter wave link between the first UE and a base station (BS); and
transmit, to a second UE and via a millimeter wave link between the first UE and the second UE, a communication associated with performing a beam failure recovery (BFR) for the millimeter wave link between the first UE and the BS,
wherein the second UE is capable of communicating with the BS via a millimeter wave link between the second UE and the BS, and
wherein the communication includes information regarding a switch to an alternate beam pair to be used in association with performing the BFR for the millimeter wave link between the first UE and the BS.
29. The first UE of claim 28 , wherein the first UE and the second UE are configured to communicate according to a protocol associated with network assisted UE cooperation, a protocol associated with network controlled interactive services, or a protocol associated with millimeter wave relaying.
30. The first UE of claim 28 , wherein the communication includes information indicating the beam failure associated with the millimeter wave link between the first UE and the BS.