Radio link monitoring and radio link failure recovery

Patent metadata

Field	Value
Publication number	US-11064376-B2
Application number	US-201916430733-A
Country	US
Kind code	B2
Filing date	Jun 4, 2019
Priority date	Jun 8, 2018
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

Methods, systems, and devices for wireless communications are described. A base station may transmit, to a user equipment (UE), a configuration of a radio link monitoring resource for a radio link that transports downlink traffic for a first type of service, the first type of service having a higher reliability specification and a lower latency specification than a second type of service offered by the base station. The UE may receive the configuration, and detect that the radio link satisfies a failure condition for the first type of service based on monitoring the RLM resource. The UE may transmit a radio link failure (RLF) indication for the first type of service to the base station based on detecting that the radio link satisfies the failure condition for the first type of service. The base station may receive the RLF from the UE, and transmit an RLF response to the UE.

First claim

What is claimed is:

1. A method for wireless communication at a user equipment (UE), comprising:
receiving, from a base station, a configuration of at least one radio link monitoring resource for a radio link that transports downlink traffic for a first type of service, the first type of service having a higher reliability specification and a lower latency specification than a second type of service offered by the base station;
detecting that the radio link satisfies a failure condition for the first type of service based at least in part on monitoring the at least one radio link monitoring resource;
transmitting a radio link failure indication for the first type of service to the base station based at least in part on detecting that the radio link satisfies the failure condition for the first type of service;
receiving, from the base station, a radio link failure response indicating a change to a communication parameter of the radio link for the first type of service via a control channel or a data channel associated with the second type of service based at least in part on transmitting the radio link failure indication; and
monitoring the radio link for subsequent downlink traffic of the first type of service based at least in part on the changed communication parameter.

2. The method of claim 1 , further comprising:
determining a target block error rate for an out of synchronization indication for a hypothetical physical downlink control channel (PDCCH) based at least in part on the configuration, wherein the radio link is detected to satisfy the failure condition for the first type of service based at least in part on the target block error rate.

3. The method of claim 1 , further comprising:
measuring a set of parameters of a reference signal communicated by the base station via the at least one radio link monitoring resource; and
mapping the set of parameters to a block error rate.

4. The method of claim 3 , wherein detecting that the radio link satisfies the failure condition for the first type of service further comprises:
detecting that the radio link satisfies the failure condition for the first type of service based at least in part on the block error rate.

5. The method of claim 3 , wherein the set of parameters comprise at least one of a block error rate parameter, a delay spread parameter, a Doppler parameter, a repetition factor parameter, a signal to noise ratio parameter, a signal to noise plus interference parameter, or any combination thereof.

6. The method of claim 3 , wherein mapping the set of parameters to the block error rate further comprises:
predicting the block error rate for a future hypothetical physical downlink control channel (PDCCH) transmission based at least in part on the set of parameters, wherein the radio link is detected to satisfy the failure condition for the first type of service based at least in part on the predicted block error rate.

7. The method of claim 1 , further comprising:
transmitting a new resource indication requesting a new resource for the radio link based at least in part on detecting that the radio link satisfies the failure condition for the first type of service and based at least in part on detecting that a quality parameter of the new resource satisfies a quality parameter target.

8. The method of claim 7 , wherein the new resource indication indicates a carrier, a beam, a transmission/reception point, a repetition factor, a diversity order, or any combination thereof.

9. The method of claim 1 , wherein the first type of service and the second type of service are provided by the base station or configured on a same component carrier, and wherein the monitoring the at least one radio link monitoring resource further comprises:
monitoring the at least one radio link monitoring resource to determine a first parameter for the radio link for the first type of service; and
monitoring the at least one radio link monitoring resource to determine a second parameter for the second type of service.

10. The method of claim 1 , wherein the first type of service and the second type of service are provided by different base stations or configured on a different component carriers, and wherein monitoring the at least one radio link monitoring resource further comprises:
monitoring the at least one radio link monitoring resource to determine a first set of parameters for the radio link for the first type of service; and
monitoring a second radio link monitoring resource to determine a second parameter for a second radio link for the second type of service.

11. The method of claim 1 , wherein detecting that the radio link satisfies the failure condition for the first type of service further comprises:
determining a hypothetical block error rate for an autonomous downlink transmission or a semi-persistently scheduled downlink transmission via a physical downlink shared channel (PDSCH);
identifying an out of synchronization indication based at least in part on the hypothetical block error rate; and
detecting that the radio link satisfies the failure condition for the first type of service based at least in part on the out of synchronization indication.

12. The method of claim 1 , further comprising:
receiving a configuration message indicating a failure indication resource, wherein the radio link failure indication is transmitted via the failure indication resource.

13. The method of claim 12 , wherein the failure indication resource is a dedicated physical random access channel, a scheduling request resource, a physical uplink control channel resource, or a combination thereof.

14. The method of claim 12 , wherein transmitting the failure indication for the first type of service further comprises:
transmitting, via a physical uplink shared channel (PUSCH) associated with the second type of service, a medium access control (MAC) control element comprising the radio link failure indication.

15. The method of claim 1 , further comprising:
receiving a configuration message indicating a plurality of failure indication resources, wherein transmitting the radio link failure indication further comprises:
transmitting the radio link failure indication via a first failure indication resource of the plurality of failure indication resources to request a new resource for the radio link corresponding to the first failure indication resource.

16. The method of claim 1 , wherein transmitting the radio link failure indication further comprises:
transmitting an indicator that indicates a failure type for the radio link from a plurality of different failure types.

17. The method of claim 1 , further comprising:
transmitting an in-synchronization indication to indicate that the radio link no longer satisfies the failure condition for the first type of service.

18. The method of claim 1 , wherein the change to the communication parameter indicates a change to a carrier, a beam, a transmission/reception point, or any combination thereof, for the radio link.

19. The method of claim 1 , wherein the radio link failure response is received in downlink control information signaling via a physical downlink control channel (PDCCH) associated with the second type of service or a medium access control (MAC) control element via a physical downlink shared channel (PDSCH) associated with the second type of service.

20. The method of claim 1 , further comprising:
detecting that the radio link does not satisfy a second failure condition for the second type of service wi

Assignees

• Qualcomm Inc

Inventors

• Yang Wei
• Jiang Jing
• He Linhai
• Chen Wanshi
• Ji Tingfang

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W24/08 Primary

  Testing, {supervising or monitoring} using real traffic · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04L1/203

  Details of error rate determination, e.g. BER, FER or WER · CPC title