Methods and apparatuses for scheduling request resource prioritization for beam failure recovery
A method for Scheduling Request (SR) resource prioritization for Beam Failure Recovery (BFR) includes a User Equipment (UE) receiving a first SR configuration from a Base Station (BS), receiving a second SR configuration from the BS, triggering a first SR procedure for a BFR procedure based on the first SR configuration, triggering a second SR procedure for a Buffer Status Report (BSR) procedure based on the second SR configuration, in a case that the first SR procedure and the second SR procedure are triggered and not cancelled and the first SR resource overlaps the second SR resource in the time domain, prioritizing the first SR resource over the second SR resource, and transmitting an SR on the first SR resource after prioritizing the first SR resource over the second SR resource.
1. A method performed by a User Equipment (UE) for sending a Scheduling Request (SR) for a multiple secondary cell (SCell) beam failure recovery (BFR) procedure, the method comprising:
receiving, from a Base Station (BS), a SR configuration indicating a first SR index associated with a first SR resource and a second SR index associated with a second SR resource;
triggering a first SR procedure for a first BFR procedure for a first SCell, the first SR procedure comprising:
transmitting a first SR on the first SR resource, and
starting a prohibit timer corresponding to the first SR resource, and
triggering a second SR procedure for a second BFR procedure for a second SCell, the first SCell and the second SCell belonging to the same cell group, the first SR resource and the second SR resource overlapping in a time domain, the second SR procedure comprising transmitting a second SR on the second SR resource when the prohibit timer is not running.
2. The method of claim 1 , wherein the prohibit timer is configured by the SR configuration.
3. The method of claim 1 , wherein the first SR resource is a Physical Uplink Control Channel (PUCCH) resource.
4. The method of claim 1 , wherein the cell group for the UE is configured with one SR configuration with the first and second SR indexes.
5. The method of claim 1 , wherein triggering the BFR procedure is in response to detecting a beam failure event on a SCell.
6. The method of claim 1 , further comprising stopping the prohibit timer when the first SR procedure is cancelled.
7. The method of claim 1 , further comprising stopping the prohibit timer in response to a Medium Access Control (MAC) Protocol Data Unit (PDU) that includes a BFR MAC Control Element (CE) being transmitted to the BS.
8. The method of claim 1 , further comprising maintaining a counter for counting how many times SRs for BFR procedures are transmitted.
9. The method of claim 8 , further comprising:
determining whether the counter exceeds a maximum number; and
transmitting an SR on the corresponding SR resource when the count is less than the maximum number.
10. A User Equipment (UAE) comprising:
one or more non-transitory computer-readable media containing computer-executable instructions embodied therein; and
at least one processor coupled to the one or more non-transitory computer-readable media, the at least one processor configured to execute the computer-executable instructions to:
receive, from a Base Station (BS), a SR configuration indicating a first SR index associated with a first SR resource and a second SR index associated with a second SR resource;
trigger a first SR procedure for a first BFR procedure for a first SCell, the first SR procedure comprising:
transmitting a first SR on the first SR resource, and
starting a prohibit timer corresponding to the first SR resource; and
trigger a second SR procedure for a second BFR procedure for a second SCell, the first SCell and the second SCell belonging to the same cell group, the first SR resource and the second SR resource overlapping in a time domain, the second SR procedure comprising transmitting a second SR on the second SR resource when the prohibit timer is not running.
11. The UE of claim 10 , wherein the prohibit timer is configured by the SR configuration.
12. The UE of claim 10 , wherein the first SR resource is a Physical Uplink Control Channel (PUCCH) resource.
13. The UE of claim 10 , wherein the cell group for the UE is configured with one SR configuration with the first and second SR indexes.
14. The UE of claim 10 , wherein the at least one processor is configured to execute the computer-executable instructions to:
trigger the BFR procedure in response to detecting a beam failure event on a SCell.
15. The UE of claim 10 , wherein the at least one processor is further configured to execute the computer-executable instructions to:
stop the prohibit timer when the first SR procedure is cancelled.
16. The UE of claim 10 , wherein the at least one processor is further configured to execute the computer-executable instructions to:
stop the prohibit timer in response to a Medium Access Control (MAC) Protocol Data Unit (PDU) that includes a BFR MAC Control Element (CE) being transmitted to the BS.
17. The UE of claim 10 , wherein the at least one processor is further configured to execute the computer-executable instructions to:
maintain a counter for counting how many times SRs for BFR procedures are transmitted.
18. The UE of claim 17 , wherein the at least one processor is further configured to execute the computer-executable instructions to:
determine whether the counter exceeds a maximum number; and
transmit an SR on the corresponding SR resource when the count is less than the maximum number.