Transmission preemption for enhanced component carriers
Techniques are described for preempting resource allocations to one or more UEs in the event that delay sensitive data is received. A resource allocation of a number of symbols may be granted to a first user equipment (UE) for first associated data to be transmitted. Subsequently, data may be received for a second UE that is more delay sensitive than the first data. The resource allocation to the first UE may be preempted, and resources allocated to the second UE for the second data within a variable length transmission time interval (TTI) of the resource allocation to the first UE. UEs may monitor for preemption during transmissions to other UEs in order to receive new resource grants associated with the preempted resource grant. Whether a UE monitors transmissions for preemption may be determined based on a quality or service (QoS) of the UE.
1. A method for wireless communication by a first user equipment (UE) in communication with a base station, comprising:
receiving, at the first UE, a downlink grant that assigns resources for transmission to at least the first UE;
monitoring, at the first UE, for a control signal indicating that a portion of the resources assigned by the downlink grant is to be preempted for transmission to a second UE;
determining, at the first UE based at least in part on the monitoring, whether to process the portion of the resources assigned by the downlink grant indicated to be preempted; and
discontinuing processing, at the first UE based at least in part on the determining, of the portion of the resources assigned by the downlink grant indicated to be preempted.
2. The method of claim 1 , wherein:
the downlink grant assigns resources on a plurality of symbols; and
the control signal indicates that the portion of the resources to be preempted comprises a subset of the plurality of symbols.
3. The method of claim 1 , wherein the first UE is configured to perform the monitoring for the control signal via radio resource control (RRC) signaling.
4. The method of claim 1 , wherein the control signal comprises a common signal decodable by a plurality of UEs including the first UE.
5. The method of claim 1 , wherein the determining comprises:
determining whether to decode the portion of the resources assigned by the downlink grant indicated to be preempted.
6. The method of claim 1 , further comprising:
determining a duration of at least one downlink transmission associated with the control signal;
suspending monitoring of downlink transmissions during the determined duration; and
continuing monitoring of downlink transmissions following the determined duration.
7. The method of claim 1 , wherein the control signal comprises a second downlink grant for at least one downlink transmission to the second UE.
8. The method of claim 7 , wherein the at least one downlink transmission is more delay sensitive than downlink data associated with the resources assigned by the downlink grant to the first UE.
9. The method of claim 1 , wherein the monitoring comprises:
monitoring one or more predetermined symbols subsequent to the downlink grant.
10. The method of claim 9 , wherein the predetermined symbols are designated in one or more of the downlink grant or via radio resource control (RRC) signaling.
11. The method of claim 1 , wherein the control signal comprises an uplink grant for a subsequent symbol.
12. An apparatus for wireless communication by a first user equipment (UE) in communication with a base station, comprising:
means for receiving, at the first UE, a downlink grant that assigns resources for transmission to at least the first UE;
means for monitoring, at the first UE, for a control signal indicating that a portion of the resources assigned by the downlink grant is to be preempted for transmission to a second UE;
means for determining, at the first UE based at least in part on the monitoring, whether to process the portion of the resources assigned by the downlink grant indicated to be preempted; and
means for discontinuing processing, at the first UE based at least in part on the determining, of the portion of the resources assigned by the downlink grant indicated to be preempted.
13. The apparatus of claim 12 , wherein:
the downlink grant assigns resources on a plurality of symbols; and
the control signal indicates that the portion of the resources to be preempted comprises a subset of the plurality of symbols.
14. The apparatus of claim 12 , wherein the means for monitoring is configured to perform the monitoring for the control signal via radio resource control (RRC) signaling.
15. The apparatus of claim 12 , wherein the control signal comprises a common signal decodable by a plurality of UEs including the first UE.
16. The apparatus of claim 12 , wherein the means for determining is configured to determine whether to decode the portion of the resources assigned by the downlink grant indicated to be preempted.
17. The apparatus of claim 12 , further comprising:
means for determining a duration of a second downlink transmission associated with the control signal; and
means for suspending monitoring of downlink transmissions during the determined duration;
wherein the means for monitoring continues monitoring of downlink transmissions following the determined duration.
18. The apparatus of claim 12 , wherein the control signal comprises an uplink grant for a subsequent symbol.
19. An apparatus for wireless communication, comprising:
a processor;
memory in electronic communication with the processor; and
instructions stored in the memory, the instructions being executable by the processor to cause the apparatus to:
receive, at a first user equipment (UE), a downlink grant that assigns resources for transmission to at least the first UE;
monitor, at the first UE, for a control signal indicating that a portion of the resources assigned by the downlink grant is to be preempted for transmission to a second UE;
determine, at the first UE based at least in part on the monitoring, whether to process the portion of the resources assigned by the downlink grant indicated to be preempted; and
discontinue processing, at the first UE based at least in part on the determining, of the portion of the resources assigned by the downlink grant indicated to be preempted.
20. The apparatus of claim 19 , wherein:
the downlink grant assigns resources on a plurality of symbols; and
the control signal indicates that the portion of the resources to be preempted comprises a subset of the plurality of symbols.
21. The apparatus of claim 19 , wherein the first UE is configured to perform the monitoring for the control signal via radio resource control (RRC) signaling.
22. The apparatus of claim 19 , wherein the control signal comprises a common signal decodable by a plurality of UEs including the first UE.
23. The apparatus of claim 19 , wherein the instructions are executable by the processor to cause the apparatus to:
determine whether to process the portion of the resources by determining whether to decode the portion of the resources.
24. The apparatus of claim 19 , wherein the instructions are executable by the processor to cause the apparatus to:
determine a duration of a second downlink transmission associated with the control signal;
suspend monitoring of downlink transmissions during the determined duration; and
continue monitoring of downlink transmissions following the determined duration.
25. The apparatus of claim 19 , wherein the control signal comprises a second downlink grant for at least one downlink transmission to the second UE.
26. The apparatus of claim 25 , wherein the at least one downlink transmission to the second UE is more delay sensitive than downlink data associated with the resources assigned by the downlink grant to the first UE.
27. The apparatus of claim 19 , wherein the instructions are executable by the processor to cause the apparatus to:
monitor one or more predetermined symbols subsequent to the downlink grant.
28. The apparatus of claim 27 , wherein the predetermined symbols are designated in one or more of the downlink grant or via radio resource control (RRC) signaling.
29. The apparatus of claim 19 , wherein the control signal comprises an uplink grant for a subsequent symbol.
30. A non-transitory computer-readable medium storing computer-executable code for wireless communication, the code executable by a processor to:
receive, at a first user equipment (UE), a downlink grant that assigns resources for transmission to at least the first UE;
monitor, at the first UE, for a control signal indicating that a portion of the resources assigned by the downlink grant is to be preempted for transmission to a second UE;
determine, at the first UE based at least in part on the monitoring, whether to process the portion of the resources assigned by the downlink grant indicated to be preempted; and
discontinue processing, at the first UE based at least in part on the determining, of the portion of the resources assigned by the downlink grant indicated to be preempted.