Beam failure recovery for secondary cell
Methods, apparatus, and systems for a beam failure recovery on one or more secondary cells are described. In one example aspect, a wireless communication method includes receiving, by a first device, parameters configured to carry out beam failure detection and beam failure recovery for secondary cells associated with the first device, determining, by the first device, whether a beam failure event has occurred on at least one of the secondary cells based on at least one of the parameters, performing, upon a determination that the beam failure event has occurred, a beam failure recovery procedure for the secondary cell with the beam failure event, and terminating the beam failure recovery procedure upon an occurrence of a termination event.
1. A method for wireless communication, comprising:
receiving, by a first device, a maximum number of beam failure recovery request attempt iterations for beam failure recovery for one or more secondary cells associated with the first device;
triggering, upon a determination that a beam failure event has occurred, a beam failure recovery request medium access control (MAC) control element for a beam failure recovery procedure for at least one secondary cell with the beam failure event,
wherein the first device includes a beam failure recovery counter configured to count a number of beam failure recovery request attempt iterations until the number of beam failure recovery request attempt iterations reaches the maximum number of beam failure recovery request attempt iterations; and
triggering, upon a determination that the beam failure recovery procedure is not successful and that the number of beam failure recovery request attempt iterations has not reached the maximum number of beam failure recovery request attempt iterations, another beam failure recovery request MAC control element for the beam failure recovery procedure for the at least one secondary cell with the beam failure event.
2. The method of claim 1 , wherein counting the number of beam failure recovery request attempt iterations includes:
triggering the beam failure recovery request MAC control element so that a beam failure recovery response timer is started; and
increasing the beam failure recovery counter by one in a case that: the first device fails to receive any notification from a second device until an expiration of a beam failure response timer; or the first device receives a notification indicating that the beam failure recovery is not successful.
3. The method of claim 1 , wherein the beam failure recovery procedure includes:
sending, by the first device, the beam failure recovery request MAC control element to a second device; and
determining, by the first device, the beam failure recovery procedure is not successful in a case that: the first device fails to receive any notification from the second device until an expiration of a beam failure response timer; or the first device receives a notification indicating that the beam failure recovery is not successful.
4. The method of claim 1 , wherein the beam failure recovery counter is reset upon occurrence of one or more predetermined reset events, including:
the at least one secondary cell with the beam failure event is recovered;
a failure beam on the at least one secondary cell that triggers the beam failure recovery procedure is recovered;
the beam failure recovery procedure is finished successfully;
the at least one secondary cell with the beam failure event is deactivated or removed;
the at least one secondary cell with the beam failure event is reconfigured;
a radio link failure is triggered; and
the number of beam failure recovery request attempt iterations reaches the maximum number of beam failure recovery request attempt iterations.
5. The method of claim 1 , further comprising terminating the beam failure recovery procedure in a case that the beam failure recovery counter reaches the maximum number of beam failure recovery request attempt iterations.
6. A method for wireless communication, comprising:
triggering, upon a determination that a beam failure event has occurred, by a first device, a beam failure recovery request medium access control (MAC) control element for a beam failure recovery procedure for at least one secondary cell with the beam failure event;
determining, by the first device, the beam failure recovery procedure is not successful in a case that: the first device fails to receive any notification from a second device until an expiration of a beam failure response timer; or the first device receives a notification indicating that the beam failure recovery is not successful; and
triggering, upon a determination that the beam failure recovery procedure is not successful, another beam failure recovery request MAC control element for the beam failure recovery procedure for the at least one secondary cell with the beam failure event,
wherein the first device includes a beam failure recovery counter configured to count a number of beam failure recovery request attempt iterations.
7. The method of claim 6 , wherein counting the number of beam failure recovery request attempt iterations includes:
triggering a beam failure recovery request MAC control element so that a beam failure recovery response timer is started; and
increasing the beam failure recovery counter by one in a case that: the first device fails to receive any notification from the second device until an expiration of a beam failure response timer; or the first device receives a notification indicating that the beam failure recovery is not successful.
8. The method of claim 6 , wherein the beam failure recovery counter is reset upon occurrence of one or more predetermined reset events, including:
the at least one secondary cell with the beam failure event is recovered;
a failure beam on the at least one secondary cell that triggers the beam failure recovery procedure is recovered;
the beam failure recovery procedure is finished successfully;
the at least one secondary cell with the beam failure event is deactivated or removed;
the at least one secondary cell with the beam failure event is reconfigured;
a radio link failure is triggered; and
the number of beam failure recovery request attempt iterations reaches a maximum number of beam failure recovery request attempt iterations.
9. The method of claim 6 , further comprising terminating the beam failure recovery procedure in a case that the beam failure recovery counter reaches a maximum number of beam failure recovery request attempt iterations.
10. A first device for wireless communication, comprising a memory and a processor, wherein the processor reads code from the memory and implements a method, comprising:
receiving, by a first device, a maximum number of beam failure recovery request attempt iterations for beam failure recovery for one or more secondary cells associated with the first device;
triggering, upon a determination that a beam failure event has occurred, a beam failure recovery request medium access control (MAC) control element for a beam failure recovery procedure for at least one secondary cell with the beam failure event,
wherein the first device includes a beam failure recovery counter configured to count a number of a beam failure recovery request attempt iterations until the number of beam failure recovery request attempt iterations reaches the maximum number of beam failure recovery request attempt iterations; and
triggering, upon a determination that the beam failure recovery procedure is not successful and that the number of beam failure recovery request attempt iterations has not reached the maximum number of beam failure recovery request attempt iterations, another beam failure recovery request MAC control element for the beam failure recovery procedure for the at least one secondary cell with the beam failure event.
11. The first device of claim 10 , wherein counting the number of beam failure recovery request attempt iterations includes:
triggering the beam failure recovery request MAC control element so that a beam failure recovery response timer is started; and
increasing the beam failure recovery counter by one in a case that: the first device fails to receive any notification from a second device until an expiration of a beam failure response timer; or the first device receives a notification indicating that the beam failure recovery is not successful.
12. The first device of claim 10 , wherein the beam failure recovery procedure includes:
sending, by the first device, the beam failure recovery request MAC control element to a second device; and
determining, by the first device, the beam failure recovery procedure is not successful in a case that: the first device fails to receive any notification from the second device until an expiration of a beam failure response timer; or the first device receives a notification indicating that the beam failure recovery is not successful.
13. The first device of claim 10 , wherein the beam failure recovery counter is reset upon occurrence of one or more predetermined reset events, including:
the at least one secondary cell with the beam failure event is recovered;
a failure beam on the at least one secondary cell that triggers the beam failure recovery procedure is recovered;
the beam failure recovery procedure is finished successfully;
the at least one secondary cell with the beam failure event is deactivated or removed;
the at least one secondary cell with the beam failure event is reconfigured;
a radio link failure is triggered; and
the number of beam failure recovery request attempt iterations reaches the maximum number of beam failure recovery request attempt iterations.
14. The first device of claim 10 , wherein the method further comprises terminating the beam failure recovery procedure in a case that the beam failure recovery counter reaches the maximum number of beam failure recovery request attempt iterations.
15. A first device for wireless communication, comprising a memory and a processor, wherein the processor reads code from the memory and implements a method, comprising:
triggering, upon a determination that a beam failure event has occurred, a beam failure recovery request medium access control (MAC) control element for a beam failure recovery procedure for at least one secondary cell with the beam failure event;
determining, by the first device, the beam failure recovery procedure is not successful in a case that: the first device fails to receive any notification from a second device until an expiration of a beam failure response timer; or the first device receives a notification indicating that the beam failure recovery is not successful; and
triggering, upon a determination that the beam failure recovery procedure is not successful, another beam failure recovery request MAC control element for the beam failure recovery procedure for the at least one secondary cell with the beam failure event,
wherein the first device includes a beam failure recovery counter configured to count a number of beam failure recovery request attempt iterations.
16. The first device of claim 15 , wherein counting the number of beam failure recovery request attempt iterations includes:
triggering a beam failure recovery request MAC control element so that a beam failure recovery response timer is started; and
increasing the beam failure recovery counter by one in a case that: the first device fails to receive any notification from the second device until an expiration of a beam failure response timer; or the first device receives a notification indicating that the beam failure recovery is not successful.
17. The first device of claim 15 , wherein the beam failure recovery counter is reset upon occurrence of one or more predetermined reset events, including:
the at least one secondary cell with the beam failure event is recovered;
a failure beam on the at least one secondary cell that triggers the beam failure recovery procedure is recovered;
the beam failure recovery procedure is finished successfully;
the at least one secondary cell with the beam failure event is deactivated or removed;
the at least one secondary cell with the beam failure event is reconfigured;
a radio link failure is triggered; and
the number of beam failure recovery request attempt iterations reaches a maximum number of beam failure recovery request attempt iterations.
18. The first device of claim 15 , wherein the method further comprises terminating the beam failure recovery procedure in a case that the beam failure recovery counter reaches a maximum number of beam failure recovery request attempt iterations.