Signaling for multiplexing of low latency communication and sidelink communications
Methods, systems, and devices for wireless communication are described. In an FDD system, a UE may identify an indicator associated with ultra-reliable low latency communications (URLLC) while communicating in a sidelink channel. The UE may also identify dedicated uplink resources in the sidelink channel, and reserve the dedicated uplink resources. The dedicated uplink resources may be reserved for an acknowledgement/negative acknowledgement (ACK/NACK) feedback or for a scheduling request (SR). URLLC data may be communicated, and the reserved uplink resources may be utilized to transmit an ACK/NACK feedback or a SR. In a TDD system, a base station may transmit information identifying dedicated resources for URLLC data. In some cases, a base station may transmit an indicator channel, which a sidelink UE may monitor to determine the presence of URLLC data, and respond accordingly.
1. A method for wireless communication, comprising:
identifying an indicator associated with wireless communications having a first transmission time interval (TTI) duration in a sidelink channel while performing device-to-device (D2D) wireless communications in the sidelink channel using a second TTI duration, wherein the first TTI duration is shorter than the second TTI duration;
identifying dedicated uplink resources for scheduling requests (SRs) for wireless uplink communications having the first TTI duration in the sidelink channel;
reserving the dedicated uplink resources for a transmission of SRs for wireless uplink communications having the first TTI duration in the sidelink channel;
monitoring a downlink indication channel in each TTI having the first TTI duration in a plurality of successive first TTIs;
detecting a scheduling grant based on the monitoring; and
suspending the D2D wireless communication in the sidelink channel during a single TTI having the first TTI duration in the plurality of successive first TTIs based on detecting the scheduling grant.
2. The method of claim 1 , wherein the dedicated uplink resources comprise a resource in each TTI having the first TTI duration in a plurality of successive first TTIs.
3. The method of claim 1 , wherein the dedicated uplink resources comprise a resource in a subset of TTIs having the first TTI duration in a plurality of successive first TTIs.
4. The method of claim 1 , wherein the single TTI having the first TTI duration comprises a next TTI having the first TTI duration in the plurality of successive first TTIs.
5. An apparatus for wireless communication at a user equipment (UE), comprising:
a processor,
memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
identify an indicator associated with wireless communications having a first transmission time interval (TTI) duration in a sidelink channel while performing device-to-device (D2D) wireless communications in the sidelink channel using a second TTI duration, wherein the first TTI duration is shorter than the second TTI duration;
identify dedicated uplink resources for scheduling requests (SRs) for wireless uplink communications having the first TTI duration in the sidelink channel;
reserve the dedicated uplink resources for a transmission of SRs for wireless uplink communications having the first TTI duration in the sidelink channel;
monitor a downlink indication channel in each TTI having the first TTI duration in a plurality of successive first TTIs;
detect a scheduling grant based on the monitoring; and
suspend the D2D wireless communication in the sidelink channel during a single TTI having the first TTI duration in the plurality of successive first TTIs based on detecting the scheduling grant.
6. The apparatus of claim 5 , wherein the dedicated uplink resources comprise a resource in each TTI having the first TTI duration in a plurality of successive first TTIs.
7. The apparatus of claim 5 , wherein the dedicated uplink resources comprise a resource in a subset of TTIs having the first TTI duration in a plurality of successive first TTIs.
8. The apparatus of claim 5 , wherein the single TTI having the first TTI duration comprises a next TTI having the first TTI duration in the plurality of successive first TTIs.
9. An apparatus for wireless communication at a user equipment (UE), comprising:
means for identifying an indicator associated with wireless communications having a first transmission time interval (TTI) duration in a sidelink channel while performing device-to-device (D2D) wireless communications in the sidelink channel using a second TTI duration, wherein the first TTI duration is shorter than the second TTI duration;
means for identifying dedicated uplink resources for scheduling requests (SRs) for wireless uplink communications having the first TTI duration in the sidelink channel;
means for reserving the dedicated uplink resources for a transmission of SRs for wireless uplink communications having the first TTI duration in the sidelink channel;
means for monitoring a downlink indication channel in each TTI having the first TTI duration in a plurality of successive first TTIs;
means for detecting a scheduling grant based on the monitoring; and
means for suspending the D2D wireless communication in the sidelink channel during a single TTI having the first TTI duration in the plurality of successive first TTIs based on detecting the scheduling grant.
10. The apparatus of claim 9 , wherein the dedicated uplink resources comprise a resource in each TTI having the first TTI duration in a plurality of successive first TTIs.
11. The apparatus of claim 9 , wherein the dedicated uplink resources comprise a resource in a subset of TTIs having the first TTI duration in a plurality of successive first TTIs.
12. The apparatus of claim 9 , wherein the single TTI having the first TTI duration comprises a next TTI having the first TTI duration in the plurality of successive first TTIs.
13. A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to:
identify an indicator associated with wireless communications having a first transmission time interval (TTI) duration in a sidelink channel while performing device-to-device (D2D) wireless communications in the sidelink channel using a second TTI duration, wherein the first TTI duration is shorter than the second TTI duration;
identify dedicated uplink resources for scheduling requests (SRs) for wireless uplink communications having the first TTI duration in the sidelink channel;
reserve the dedicated uplink resources for a transmission of SRs for wireless uplink communications having the first TTI duration in the sidelink channel;
monitor a downlink indication channel in each TTI having the first TTI duration in a plurality of successive first TTIs;
detect a scheduling grant based on the monitoring; and
suspend the D2D wireless communication in the sidelink channel during a single TTI having the first TTI duration in the plurality of successive first TTIs based on detecting the scheduling grant.
14. The non-transitory computer-readable medium of claim 13 , wherein the dedicated uplink resources comprise a resource in each TTI having the first TTI duration in a plurality of successive first TTIs.
15. The non-transitory computer-readable medium of claim 13 , wherein the dedicated uplink resources comprise a resource in a subset of TTIs having the first TTI duration in a plurality of successive first TTIs.
16. The non-transitory computer-readable medium of claim 13 , wherein the single TTI having the first TTI duration comprises a next TTI having the first TTI duration in the plurality of successive first TTIs.