Traffic-priority based silencing techniques for interference mitigation
Techniques are described herein to provide priority traffic grant-less access to pre-defined communication resources that are semi-persistently scheduled. A set of semi-persistent communication resources may be reserved for use by priority traffic. If not used for priority traffic, the semi-persistent resources may be scheduled for use by other types of traffic. As priority traffic is identified, the priority traffic may be transmitted using the semi-persistent resource without having those communication resources granted by a scheduling entity. Such grant-less access to the semi-persistent resources may result in interference between the scheduled traffic and the priority traffic communicated without first scheduling the specific communication resources. To mitigate interference between different traffic types, a user equipment (UE) may transmit a device-to-device silencing message to other UEs. Upon receiving the silencing message, the other UEs may release any scheduled communication resources that at least partially overlap with the semi-persistent resources.
1. A method for wireless communication, comprising:
receiving, by a first user equipment (UE), a grant of communication resources;
receiving a silencing message from a second UE, the silencing message indicating that the second UE is to communicate priority traffic using semi-persistent resources, wherein the semi-persistent resources at least partially overlap with the communication resources;
determining a next occurrence of the semi-persistent resources after receiving the silencing message; and
releasing at least a portion of the communication resources that at least partially overlap with the next occurrence of the semi-persistent resources based at least in part on the silencing message.
2. The method of claim 1 , wherein:
the silencing message is received during the same transmission time interval that the portion of the communication resources are released.
3. The method of claim 1 , further comprising:
receiving a discovery message indicating that the second UE is capable of generating priority traffic; and
transmitting a reporting message to a base station indicating that the second UE has received the discovery message from the first UE.
4. The method of claim 3 , wherein:
the discovery message is a device-to-device communication received directly from the second UE.
5. The method of claim 1 , further comprising:
receiving, from a base station, a configuration message indicating a zone assigned to the first UE and that the semi-persistent resources are associated with the zone.
6. The method of claim 5 , wherein:
the zone is based at least in part on the second UE being capable of generating priority traffic.
7. The method of claim 1 , further comprising:
comparing the communication resources allocated to the first UE by the grant to the semi-persistent resources associated with the second UE, wherein releasing the communication resources is based at least in part on the comparing.
8. The method of claim 1 , further comprising:
determining that the communication resources are being used to communicate traffic having a lesser priority than the priority traffic, wherein releasing the communication resources is based at least in part on the determining.
9. The method of claim 1 , further comprising:
refraining, by the first UE, from transmitting traffic during the communication resources based at least in part on releasing the communication resources.
10. The method of claim 9 , further comprising:
receiving, by the first UE, a second grant that includes new communication resources rescheduling the traffic for transmission, wherein the new communication resources are different from the communication resources.
11. The method of claim 1 , wherein:
the second UE is capable of generating priority traffic.
12. The method of claim 1 , wherein:
the priority traffic is low latency traffic.
13. An apparatus for wireless communication, in a system comprising:
a processor;
memory in electronic communication with the processor; and
instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
receive, by a first user equipment (UE), a grant of communication resources;
receive a silencing message from a second UE, the silencing message indicating that the second UE is to communicate priority traffic using semi-persistent resources, wherein the semi-persistent resources at least partially overlap with the communication resources;
determine a next occurrence of the semi-persistent resources after receiving the silencing message; and
release at least a portion of the communication resources that at least partially overlap with the next occurrence of the semi-persistent resources based at least in part on the silencing message.
14. The apparatus of claim 13 , wherein:
the silencing message is received during the same transmission time interval that the portion of the communication resources are released.
15. The apparatus of claim 13 , wherein the instructions are further executable by the processor to:
receive a discovery message indicating that the second UE is capable of generating priority traffic; and
transmit a reporting message to a base station indicating that the second UE has received the discovery message from the first UE.
16. The apparatus of claim 15 , wherein:
the discovery message is a device-to-device communication received directly from the second UE.
17. The apparatus of claim 13 , wherein the instructions are further executable by the processor to:
receive, from a base station, a configuration message indicating a zone assigned to the first UE and that the semi-persistent resources are associated with the zone.
18. The apparatus of claim 17 , wherein:
the zone is based at least in part on the second UE being capable of generating priority traffic.
19. The apparatus of claim 13 , wherein the instructions are further executable by the processor to:
compare the communication resources allocated to the first UE by the grant to the semi-persistent resources associated with the second UE, wherein releasing the communication resources is based at least in part on the comparing.
20. The apparatus of claim 13 , wherein the instructions are further executable by the processor to:
determine that the communication resources are being used to communicate traffic having a lesser priority than the priority traffic, wherein releasing the communication resources is based at least in part on the determining.
21. The apparatus of claim 13 , wherein the instructions are further executable by the processor to:
refrain, by the first UE, from transmitting traffic during the communication resources based at least in part on releasing the communication resources.
22. The apparatus of claim 21 , wherein the instructions are further executable by the processor to:
receive, by the first UE, a second grant that includes new communication resources rescheduling the traffic for transmission, wherein the new communication resources are different from the communication resources.
23. The apparatus of claim 13 , wherein:
the second UE is capable of generating priority traffic.
24. The apparatus of claim 13 , wherein:
the priority traffic is low latency traffic.