Radio link monitoring and beam failure recovery resource configuration and operation
Certain aspects of the present disclosure provide to techniques for radio link monitoring (RLM), detecting beam failure, and beam failure recovery (BFR) using radio link monitoring reference signal (RML-RS) resources and beam failure recovery reference signal (BFR-RS) resources. An exemplary method by a user equipment (UE) may include obtaining a first configuration indicating one or more radio link monitoring reference signal (RLM-RS) resources and one or more beam failure recovery reference signal (BFR-RS) resources, wherein each RLM-RS resource corresponds to at least a first link, and each BFR-RS resource corresponds to at least a second link, obtaining a first indication that a first link quality for the first link is below a first threshold and a second link quality for the second link is above a second threshold, and taking action regarding a radio link failure (RLF) based on the indication.
1. A method for wireless communications performed by a user equipment (UE), comprising:
obtaining a first configuration indicating one or more radio link monitoring reference signal (RLM-RS) resources and one or more beam failure recovery reference signal (BFR-RS) resources;
transmitting a beam failure recovery request via at least a first resource;
taking action regarding a radio link failure (RLF) when the first resource is not included in the one or more RLM-RS resources or when the UE receives a response for the beam failure recovery request;
receiving a second configuration from a network, wherein the second configuration indicates one or more other RLM-RS resources different from the RLM-RS resources in the first configuration; and
performing radio link monitoring using the one or more other RLM-RS resources.
2. The method of claim 1 , wherein the first resource is included in at least one of:
the one or more RLM-RS resources, or
the one or more BFR-RS resources.
3. The method of claim 1 , wherein the first configuration indicates suitability criteria for selecting a candidate beam for sending the beam failure recovery request.
4. The method of claim 1 , wherein taking action comprises:
ceasing counting out-of-synchronization (OOS) indications based on the RLM-RS resources.
5. The method of claim 4 , further comprising:
starting a timer; and
continuing counting the OOS indications based on the RLM-RS resources upon expiration of the timer.
6. The method of claim 4 , further comprising:
receiving a message from the network; and
continuing counting the OOS indications based on the RLM-RS resources in response to the message.
7. The method of claim 1 , wherein taking action comprises:
pausing an out-of-synchronization (OOS) timer.
8. The method of claim 1 , wherein taking action comprises:
increasing a threshold number of out-of-synchronization (OOS) indications.
9. The method of claim 1 , wherein taking action comprises:
increasing a limit of an out-of-synchronization (OOS) timer.
10. A method for wireless communications performed by a base station (BS), comprising:
providing, to a user equipment (UE), a first configuration indicating one or more radio link monitoring reference signal (RLM-RS) resources and one or more beam failure recovery reference signal (BFR-RS) resources;
receiving a beam failure recovery request from the UE via a first resource included in the one or more BFR-RS resources; and
providing a second configuration to the UE, wherein the second configuration includes the first resource as an RLM-RS resource, and wherein the second configuration indicates one or more RLM-RS resources that are not indicated in the first configuration.
11. The method of claim 10 , wherein the first configuration indicates suitability criteria for selecting a candidate beam for sending the beam failure recovery request.
12. The method of claim 10 , wherein providing the second configuration comprises:
transmitting a response to the beam failure recovery request, wherein the response implicitly indicates the second configuration includes the first resource as an RLM-RS resource.