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 of one or more symbols in a variable length downlink transmission time interval (TTI) for transmission to the first UE;
monitoring, at the first UE, one or more of the one or more symbols of the variable length downlink TTI 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 control signal, 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 control signal comprises a second downlink grant for at least one downlink transmission to the second UE.
3. The method of claim 2 , 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.
4. The method of claim 1 , wherein the control signal comprises an uplink grant for a subsequent symbol for at least one uplink transmission from the second UE.
5. The method of claim 1 , wherein the control signal comprises a common signal decoded by a plurality of UEs.
6. The method of claim 5 , wherein the plurality of UEs are configured to monitor for the control signal via radio resource control (RRC) signaling.
7. The method of claim 1 , wherein the monitoring one or more of the one or more symbols comprises:
monitoring one or more predetermined symbols within the one or more symbols.
8. The method of claim 7 , wherein the predetermined symbols are designated in one or more of the downlink grant or via radio resource control (RRC) signaling.
9. The method of claim 1 , further comprising:
determining, at the first UE, a duration of a second downlink transmission associated with the control signal;
suspending monitoring of downlink transmissions during the determined duration; and
resuming monitoring of downlink transmissions following the determined duration.
10. 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 of one or more symbols in a variable length downlink transmission time interval (TTI) for transmission to the first UE;
means for monitoring, at the first UE, one or more of the one or more symbols of the variable length downlink TTI 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 control signal, 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.
11. The apparatus of claim 10 , wherein the control signal comprises a second downlink grant for at least one downlink transmission to the second UE.
12. The apparatus of claim 11 , 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.
13. The apparatus of claim 10 , wherein the means for monitoring one or more of the one or more symbols is operable to monitor one or more predetermined symbols within the one or more symbols.
14. The apparatus of claim 10 , further comprising:
means for determining, at the first UE, a duration of a second downlink transmission associated with the control signal;
means for suspending monitoring of downlink transmissions during the determined duration; and
means for resuming monitoring of downlink transmissions following the determined duration.
15. An apparatus for wireless communication by a first user equipment (UE) in communication with a base station, 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 the first UE, a downlink grant that assigns resources of one or more symbols in a variable length downlink transmission time interval (TTI) for transmission to the first UE;
monitor, at the first UE, one or more of the one or more symbols of the variable length downlink TTI 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 control signal, 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.
16. The apparatus of claim 15 , wherein the control signal comprises a second downlink grant for at least one downlink transmission to the second UE.
17. The apparatus of claim 16 , 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.
18. The apparatus of claim 15 , wherein the control signal comprises an uplink grant for a subsequent symbol for at least one uplink transmission from the second UE.
19. The apparatus of claim 15 , wherein the control signal comprises a common signal decoded by a plurality of UEs.
20. The apparatus of claim 19 , wherein the plurality of UEs are configured to monitor for the control signal via radio resource control (RRC) signaling.
21. The apparatus of claim 15 , wherein the instructions are executable by the processor to cause the apparatus to:
monitor one or more of the one or more symbols by monitoring one or more predetermined symbols within the one or more symbols in the resources assigned by the downlink grant.
22. The apparatus of claim 21 , wherein the predetermined symbols are designated in one or more of the downlink grant or via radio resource control (RRC) signaling.
23. The apparatus of claim 15 , wherein the instructions are executable by the processor to cause the apparatus to:
determine, at the first UE, a duration of a second downlink transmission associated with the control signal;
suspend monitoring of downlink transmissions during the determined duration; and
resume monitoring of downlink transmissions following the determined duration.
24. A non-transitory computer-readable medium storing computer-executable code for wireless communication by a first user equipment (UE) in communication with a base station, the code executable by a processor to:
receive, at the first UE, a downlink grant that assigns resources of one or more symbols in a variable length downlink transmission time interval (TTI) for transmission to the first UE;
monitor, at the first UE, one or more of the one or more symbols of the variable length downlink TTI 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 control signal, 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.