Method and device for managing HARQ process in NR V2X
A method for performing wireless communication by a first device is provided. The method may include: receiving, from one or more second devices, one or more physical sidelink control channels (PSCCHs); receiving, from the one or more second devices, one or more physical sidelink shared channels (PSSCHs) related to the one or more PSCCHs; and performing one or more hybrid automatic repeat request (HARQ) process related to the one or more PSSCHs with the one or more second devices.
1. A method performed by a first device, the method comprising:
receiving, from one or more second devices, one or more control channels;
receiving, from the one or more second devices, one or more shared channels related to the one or more control channels; and
performing one or more hybrid automatic repeat request (HARQ) processes related to the one or more shared channels with the one or more second devices,
wherein, based on a generation of a new sidelink packet while the one or more HARQ processes are maintained, a HARQ process among the one or more HARQ processes is terminated, and
wherein the HARQ process is a randomly selected HARQ process, a HARQ process with a fewest number of receptions, a HARQ process with a lowest priority, or a HARQ process with a lower priority than a priority related to the new sidelink packet.
2. The method of claim 1 , wherein the one or more HARQ processes are shared based on at least one of a cast type or a resource allocation mode related to one HARQ entity.
3. The method of claim 1 , wherein the one or more HARQ processes are independently configured based on at least one of a cast type or a resource allocation mode related to one HARQ entity.
4. The method of claim 3 , wherein a number of the one or more HARQ processes for the at least one of the cast type or the resource allocation mode related to the one HARQ entity is pre-configured.
5. The method of claim 1 , wherein the one or more HARQ processes are terminated based on the one or more second devices receiving HARQ feedback.
6. The method of claim 1 , wherein the one or more HARQ processes are terminated based on the first device receiving the one or more shared channels from the one or more second devices by a maximum number of retransmissions, and
wherein the maximum number of retransmissions is configured by a base station or the one or more second devices.
7. The method of claim 1 ,
wherein the HARQ process with the lowest priority is selected based on priorities included in control information received on the one or more control channels.
8. The method of claim 1 , further comprising:
receiving an indication value on a last shared channel among the one or more shared channels from the one or more second devices.
9. The method of claim 8 , further comprising:
terminating the HARQ process related to the last shared channel based on the indication value,
wherein the indication value includes 1 bit.
10. A first device, comprising:
at least one transceiver;
at least one processor; and
at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause the first device to perform operations comprising:
receiving, from one or more second devices, one or more control channels,
receiving, from the one or more second devices, one or more shared channels related to the one or more control channels; and
performing one or more hybrid automatic repeat request (HARQ) processes related to the one or more shared channels with the one or more second devices,
wherein, based on a generation of a new sidelink packet while the one or more HARQ processes are maintained, a HARQ process among the one or more HARQ processes is terminated, and
wherein the HARQ process is a randomly selected HARQ process, a HARQ process with a fewest number of receptions, a HARQ process with a lowest priority, or a HARQ process with a lower priority than a priority related to the new sidelink packet.
11. The first device of claim 10 , wherein the one or more HARQ processes are shared based on at least one of a cast type or a resource allocation mode related to one HARQ entity.
12. The first device of claim 10 , wherein the one or more HARQ processes are independently configured based on at least one of a cast type or a resource allocation mode related to one HARQ entity.
13. The first device of claim 12 , wherein a number of the one or more HARQ processes for the at least one of the cast type or the resource allocation mode related to the one HARQ entity is pre-configured.
14. The first device of claim 10 , wherein the one or more HARQ processes are terminated based on the one or more second devices receiving HARQ feedback.
15. The first device of claim 10 , wherein the one or more HARQ processes are terminated based on the first device receiving the one or more shared channels from the one or more second devices by a maximum number of retransmissions, and
wherein the maximum number of retransmissions is configured by a base station or the one or more second devices.
16. The first device of claim 10 , wherein the HARQ process with the lowest priority is selected based on priorities included in control information received on the one or more control channels.
17. The first device of claim 10 , wherein the operations further comprise receiving an indication value on a last shared channel among the one or more shared channels from the one or more second devices.
18. The first device of claim 17 , wherein the operations further comprise terminating the HARQ process related to the last shared channel based on the indication value, and
wherein the indication value includes 1 bit.
19. A processing device adapted to control a first device, the processing device comprising:
at least one processor; and
at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause the first device to perform operations comprising:
receiving, from one or more second devices, one or more control channels;
receiving, from the one or more second devices, one or more shared channels related to the one or more control channels; and
performing one or more hybrid automatic repeat request (HARQ) processes related to the one or more shared channels with the one or more second devices,
wherein, based on a generation of a new sidelink packet while the one or more HARQ processes are maintained, a HARQ process among the one or more HARQ processes is terminated, and
wherein the HARQ process is a randomly selected HARQ process, a HARQ process with a fewest number of receptions, a HARQ process with a lowest priority, or a HARQ process with a lower priority than a priority related to the new sidelink packet.
20. The processing device of claim 19 , wherein the HARQ process with the lowest priority is selected based on priorities included in control information received on the one or more control channels.