Methods and apparatuses for uplink transmission prioritization

1. A method performed by a User Equipment (UE) for Uplink (UL) transmission prioritization, the method comprising:

receiving a Radio Resource Control (RRC) message;

detecting a beam failure event on a Special Cell (SpCell); and

performing operations in response to detecting the beam failure event, the operations comprising:

transmitting a preamble to the SpCell;

receiving a Random Access Response (RAR) message from the SpCell;

determining whether a first UL resource is enabled for transmission of a Beam Failure Recovery (BFR) report according to whether the first UL resource is indicated by the RAR message and whether the RRC message is configured with an indication; and

transmitting the BFR report on the first UL resource after determining that the first UL resource is enabled for the transmission of the BFR report.

2. The method of claim 1 , further comprising:

determining that the first UL resource is enabled for the transmission of the BFR report when the first UL resource is indicated by the RAR message and the RRC message is configured with the indication.

3. The method of claim 1 , further comprising:

starting a timer after the preamble is transmitted;

receiving an UL grant that indicates a second UL resource when the timer is not running;

determining that the second UL resource is not enabled for the transmission of the BFR report; and

disabling the UE from transmitting the BFR report on the second UL resource after determining that the second UL resource is not enabled for the transmission of the BFR report.

4. The method of claim 1 , further comprising:

receiving an UL grant that indicates a second UL resource scheduled on a Secondary Cell (SCell);

determining that the second UL resource is not enabled for the transmission of the BFR report; and

disabling the UE from transmitting the BFR report on the second UL resource after determining that the second UL resource is not enabled for the transmission of the BFR report.

5. The method of claim 1 , further comprising:

receiving an UL grant in Downlink Control Information (DCI) that indicates a second UL resource;

determining that the second UL resource is not enabled for the transmission of the BFR report; and

disabling the UE from transmitting the BFR report on the second UL resource after determining that the second UL resource is not enabled for the transmission of the BFR report.

6. The method of claim 1 , wherein the BFR report comprises a bitmap that contains a first bit and at least one second bit, the first bit indicates whether the beam failure event is detected on the SpCell, and each of the at least one second bit indicates whether the beam failure event is detected on a corresponding Secondary Cell (SCell).

7. The method of claim 6 , further comprising:

setting the first bit and one of the at least one second bit to a same value when the beam failure event is detected on the SpCell and an SCell corresponding to the one of the at least one second bit.

8. The method of claim 1 , further comprising:

determining that the first UL resource is not enabled for the transmission of the BFR report in a case that the first UL resource is not indicated by the RAR message or the RRC message is not configured with the indication.

9. The method of claim 8 , further comprising:

disabling the UE from transmitting the BFR report on the first UL resource after determining that the first UL resource is not enabled for the transmission of the BFR report.

10. A User Equipment (UE) comprising:

a memory; and

at least one processor coupled to the memory and configured to:

receive a Radio Resource Control (RRC) message;

detect a beam failure event on a Special Cell (SpCell); and

perform operations in response to detecting the beam failure event, the operations comprising:

transmitting a preamble to the SpCell;

receiving a Random Access Response (RAR) message from the SpCell;

determining whether a first Uplink (UL) resource is enabled for transmission of a Beam Failure Recovery (BFR) report according to whether the first UL resource is indicated by the RAR message and whether the RRC message is configured with an indication; and

transmitting the BFR report on the first UL resource after determining that the first UL resource is enabled for the transmission of the BFR report.

11. The UE of claim 10 , wherein the at least one processor is further configured to:

determine that the first UL resource is enabled for the transmission of the BFR report when the first UL resource is indicated by the RAR message and the RRC message is configured with the indication.

12. The UE of claim 10 , wherein the at least one processor is further configured to:

start a timer after the preamble is transmitted;

receive an UL grant that indicates a second UL resource when the timer is not running;

determine that the second UL resource is not enabled for the transmission of the BFR report; and

disable the UE from transmitting the BFR report on the second UL resource after determining that the second UL resource is not enabled for the transmission of the BFR report.

13. The UE of claim 10 , wherein the at least one processor is further configured to:

receive an UL grant that indicates a second UL resource scheduled on a Secondary Cell (SCell);

determine that the second UL resource is not enabled for the transmission of the BFR report; and

disable the UE from transmitting the BFR report on the second UL resource after determining that the second UL resource is not enabled for the transmission of the BFR report.

14. The UE of claim 10 , wherein the at least one processor is further configured to:

receive an UL grant in Downlink Control Information (DCI) that indicates a second UL resource;

determine that the second UL resource is not enabled for the transmission of the BFR report; and

disable the UE from transmitting the BFR report on the second UL resource after determining that the second UL resource is not enabled for the transmission of the BFR report.

15. The UE of claim 10 , wherein the BFR report comprises a bitmap that contains a first bit and at least one second bit, the first bit indicates whether the beam failure event is detected on the SpCell, and each of the at least one second bit indicates whether the beam failure event is detected on a corresponding Secondary Cell (SCell).

16. The UE of claim 15 , wherein the at least one processor is further configured to:

set the first bit and one of the at least one second bit to a same value when the beam failure event is detected on the SpCell and an SCell corresponding to the one of the at least one second bit.

17. The method of claim 1 , wherein the indication is contained in a beam failure recovery configuration Information Element (IE) in the RRC message in a case that the RRC message is configured with the indication.

18. The UE of claim 10 , wherein the indication is contained in a beam failure recovery configuration Information Element (IE) in the RRC message in a case that the RRC message is configured with the indication.

19. The UE of claim 10 , wherein the at least one processor is further configured to:

determine that the first UL resource is not enabled for the transmission of the BFR report in a case that the first UL resource is not indicated by the RAR message or the RRC message is not configured with the indication.

20. The UE of claim 19 , wherein the at least one processor is further configured to:

disable the UE from transmitting the BFR report on the first UL resource after determining that the first UL resource is not enabled for the transmission of the BFR report.