Method and apparatus for SR and BSR cancellation
A method for wireless communication performed by a UE is provided. The method includes: triggering a BSR; triggering an SR; receiving a UL grant that allocates a PUSCH duration; performing MAC PDU assembly to obtain a MAC PDU for transmission on the PUSCH duration; and performing an update process after determining that the MAC PDU includes a BSR MAC CE containing buffer status information up to a last event that triggers the BSR prior to the MAC PDU assembly; wherein the update process includes keeping the SR triggered prior to the MAC PDU assembly pending at the start of the PUSCH duration.
1. A user equipment (UE) comprising:
one or more non-transitory computer-readable media having computer-executable instructions embodied thereon; and
at least one processor coupled to the one or more non-transitory computer-readable media, wherein the at least one processor is configured to execute the computer-executable instructions to:
detect arrival of data at a logical channel;
trigger a Buffer Status Report (BSR) from the logical channel;
trigger a Scheduling Request (SR) from the logical channel;
receive an uplink (UL) grant that allocates a Physical Uplink Shared Channel (PUSCH) duration;
perform a Medium Access Control (MAC) Protocol Data Unit (PDU) assembly to obtain a MAC PDU for transmission on the PUSCH duration, wherein the MAC PDU includes the data from the logical channel; and
perform an update process after determining that the MAC PDU comprises a BSR MAC Control Element (CE) containing buffer status information up to a last event that triggers the BSR prior to the MAC PDU assembly;
wherein the update process comprises:
keeping the SR triggered prior to the MAC PDU assembly pending at the start of the MAC PDU transmission on the PUSCH duration, wherein the PUSCH duration overlaps with a Physical Uplink Control Channel (PUCCH) duration, and wherein the start of the MAC PDU transmission on the PUSCH duration occurs prior to the start of the PUCCH duration.
2. The UE of claim 1 , wherein the update process further comprises:
canceling the pending SR triggered prior to the MAC PDU assembly when the MAC PDU transmission on the PUSCH duration is completed.
3. The UE of claim 1 , wherein the update process further comprises:
keeping the SR triggered prior to the MAC PDU assembly pending when the MAC PDU transmission on the PUSCH duration is completed.
4. The UE of claim 1 , wherein the update process further comprises:
keeping the BSR triggered prior to the MAC PDU assembly pending at the start of the MAC PDU transmission on the PUSCH duration; and
canceling the pending BSR triggered prior to the MAC PDU assembly when the MAC PDU transmission on the PUSCH duration is completed.
5. The UE of claim 1 , wherein:
the logical channel is associated with a high priority; and
the MAC PDU does not include data from the logical channel.
6. The UE of claim 5 , wherein the at least one processor is further configured to execute the computer-executable instructions to:
receive, via a Radio Resource Control (RRC) signaling, a configuration that includes a bit indication, wherein:
the bit indication is set to a first value to indicate that the logical channel is associated with the high priority; and
the bit indication is set to a second value to indicate that the logical channel is not associated with the high priority.
7. The UE of claim 6 , wherein the configuration is configured in a scheduling request resource configuration or a logical channel configuration.
8. The UE of claim 1 , wherein the MAC PDU does not include data from a logical channel associated with a high priority.
9. The UE of claim 1 , wherein the UL grant is not associated with a high priority.
10. The UE of claim 9 , wherein the UL grant comprises a bit indication in a Downlink Control Information (DCI) field, wherein:
the bit indication is set to a first value to indicate that the UL grant is associated with the high priority; and
the bit indication is set to a second value to indicate that the UL grant is not associated with the high priority.
11. A method for wireless communication performed by a user equipment (UE), the method comprising:
detecting arrival of data at a logical channel;
triggering a Buffer Status Report (BSR) from the logical channel;
triggering a Scheduling Request (SR) from the logical channel;
receiving an uplink (UL) grant that allocates a Physical Uplink Shared Channel (PUSCH) duration;
performing a Medium Access Control (MAC) Protocol Data Unit (PDU) assembly to obtain a MAC PDU for transmission on the PUSCH duration, wherein the MAC PDU includes the data from the logical channel; and
performing an update process after determining that the MAC PDU comprises a BSR MAC Control Element (CE) containing buffer status information up to a last event that triggers the BSR prior to the MAC PDU assembly;
wherein the update process comprises:
keeping the SR triggered prior to the MAC PDU assembly pending at the start of the MAC PDU transmission on the PUSCH duration, wherein the PUSCH duration overlaps with a Physical Uplink Control Channel (PUCCH) duration, and wherein the start of the MAC PDU transmission on the PUSCH duration occurs prior to the start of the PUCCH duration.
12. The method of claim 11 , wherein the update process further comprises:
canceling the pending SR triggered prior to the MAC PDU assembly when the MAC PDU transmission on the PUSCH duration is completed.
13. The method of claim 11 , wherein the update process further comprises:
keeping the SR triggered prior to the MAC PDU assembly pending when the MAC PDU transmission on the PUSCH duration is completed.
14. The method of claim 11 , wherein the update process further comprises:
keeping the BSR triggered prior to the MAC PDU assembly pending at the start of the MAC PDU transmission on the PUSCH duration; and
canceling the pending BSR triggered prior to the MAC PDU assembly when the MAC PDU transmission on the PUSCH duration is completed.
15. The method of claim 11 , wherein:
the logical channel is associated with a high priority; and
the MAC PDU does not include data from the logical channel.
16. The method of claim 15 , further comprising:
receiving, via a Radio Resource Control (RRC) signaling, a configuration that includes a bit indication, wherein:
the bit indication is set to a first value to indicate that the logical channel is associated with the high priority; and
the bit indication is set to a second value to indicate that the logical channel is not associated with the high priority.
17. The method of claim 16 , wherein the configuration is configured in a scheduling request resource configuration or a logical channel configuration.
18. The method of claim 11 , wherein the MAC PDU does not include data from a logical channel associated with a high priority.
19. The method of claim 11 , wherein the UL grant is not associated with a high priority.
20. The method of claim 19 , wherein the UL grant comprises a bit indication in a Downlink Control Information (DCI) field, wherein:
the bit indication is set to a first value to indicate that the UL grant is associated with the high priority; and
the bit indication is set to a second value to indicate that the UL grant is not associated with the high priority.