Autonomously triggering retransmission of data
Apparatuses, methods, and systems are disclosed for autonomous packet duplication and retransmission. One apparatus includes a processor that generates a first PDU for a first uplink grant associated with a first HARQ process and generates a second MAC PDU for a second uplink grant associated with a second HARQ process. Here, the first uplink grant is a configured grant, the second uplink grant has overlapping PUSCH resources with the first uplink grant, and the second uplink grant has a higher priority than the first uplink grant. The apparatus includes a transceiver that transmits the second MAC PDU according to the second uplink grant and does not transmit the first MAC PDU according to the first uplink grant. The processor autonomously triggers a retransmission of the first MAC PDU for the first HARQ process without receiving network signaling for the retransmission.
1 . A user equipment (“UE”) for wireless communication, comprising:
a memory; and
a processor coupled with the memory and configured to cause the UE to:
generate a first medium access control (“MAC”) protocol data unit (“PDU”) for a first uplink grant associated with an initial transmission for a first hybrid automatic repeat request (“HARQ”) process, wherein the first uplink grant is a configured grant, wherein physical uplink shared channel (“PUSCH”) resources corresponding to the first uplink grant are not dynamically scheduled, and wherein the PUSCH resources are not granted by Downlink Control Information (“DCI”); and
initiate a configured grant timer associated with first HARQ process based on the first uplink grant;
generate a second MAC PDU for a second uplink grant associated with a second HARQ process having overlapping physical uplink shared channel (“PUSCH”) resources with the first uplink grant, wherein data of the second MAC PDU has a higher priority than data of the first MAC PDU;
transmit the second MAC PDU according to the second uplink grant and does not transmit the first MAC PDU according to the first uplink grant;
stop the configured grant timer associated with first HARQ process based on not transmitting the first MAC PDU according to the first uplink grant; and
autonomously trigger a retransmission of the first MAC PDU for the first HARQ process using next available configured grant resources for the first HARQ process and without receiving network signaling for the retransmission.
2 . The UE of claim 1 , wherein to autonomously trigger the retransmission of the first MAC PDU for the first HARQ process, the processor is configured to cause the UE to transmit the first MAC PDU on a subsequent uplink configured grant resource of the first uplink grant on the first HARQ process.
3 . The UE of claim 1 , wherein the second uplink grant is received later than the first uplink grant.
4 . The UE of claim 1 , wherein the first HARQ process and the second HARQ process correspond to different HARQ processes.
5 . A method performed at a user equipment (“UE”), the method comprising:
generating, at the UE, a first medium access control (“MAC”) protocol data unit (“PDU”) for a first uplink grant associated with an initial transmission for a first hybrid automatic repeat request (“HARQ”) process, wherein the first uplink grant is a configured grant, wherein physical uplink shared channel (“PUSCH”) resources corresponding to the first uplink grant are not dynamically scheduled, and wherein the PUSCH resources are not granted by Downlink Control Information (“DCI”);
initiating a configured grant timer associated with first HARQ process based on the first uplink grant;
generating, at the UE, a second MAC PDU for a second uplink grant associated with a second HARQ process having overlapping physical uplink shared channel (“PUSCH”) resources with the first uplink grant, wherein the second uplink grant has a higher priority than the first uplink grant,
transmitting, by the UE, the second MAC PDU according to the second uplink grant and not transmitting the first MAC PDU according to the first uplink grant; and
stopping, by the UE, the configured grant timer associated with first HARQ process based on not transmitting the first MAC PDU according to the first uplink grant; and
autonomously triggering, at the UE, a retransmission of the first MAC PDU for the first HARQ process, wherein autonomously triggering retransmission comprises triggering the retransmission using next available configured grant resources for the first HARQ process and without receiving network signaling for the retransmission.
6 . The method of claim 5 , wherein autonomously triggering the retransmission of the first MAC PDU for the first HARQ process comprises transmitting the first MAC PDU on a subsequent uplink configured grant resource of the first uplink grant on the first HARQ process.
7 . The method of claim 5 , wherein the second uplink grant is received later than the first uplink grant.
8 . The method of claim 5 , wherein the first HARQ process and the second HARQ process correspond to different HARQ processes.