Method and apparatus for resource collision avoidance on sidelink
Method and apparatus for resource collision avoidance on sidelink are disclosed. One method of apparatus includes determining reserved resource on SL for a following SL transmission; transmitting information of the reserved resource to a mode 4 UE in a resource reservation field in SCI. Further, the reserved resource on SL is determined according to DCI received from a base station. Further, a resource guarantee indication, which indicates whether the reserved resource indicated in the resource reservation field in the SCI can be occupied by the mode 4 UE, is transmitted to the mode 4 UE.
1. An apparatus comprising:
a processor that determines reserved resource on sidelink for a following sidelink transmission; and
a transceiver that transmits information of the reserved resource to a mode 4 user equipment in a resource reservation field in sidelink control information
wherein the transceiver, transmits a resource guarantee indication to the mode 4 user equipment which indicates whether the reserved resource indicated in the resource reservation field in the sidelink control information can be occupied by the mode 4 user equipment.
2. The apparatus according to claim 1 , wherein the processor determines the reserved resource on sidelink according to downlink control information received from a base station.
3. The apparatus according to claim 1 , wherein, the resource reservation field in the sidelink control information indicates an interval between current scheduled resource and the reserved resource.
4. The apparatus according to claim 3 , the resource reservation field in the sidelink control information has a length of 4 bits and is same with a combination of a sidelink semi-persistent scheduling configuration index of 3 bits and an activation/release indication of 1 bit, wherein decimal values 1-10 equivalent of the resource reservation field of 4 bits indicate a corresponding extent of the interval between the current scheduled resource and the reserved resource, a decimal value 11 equivalent of the resource reservation field of 4 bits indicates 0.5 extent of the interval between the current scheduled resource and the reserved resource, a decimal value 12 equivalent of the resource reservation field of 4 bits indicates 0.2 extent of the interval between the current scheduled resource and the reserved resource, and a decimal value 0 equivalent of the resource reservation field of 4 bits indicates that no reserved resource is kept for the following transmission.
5. The apparatus according to claim 1 , wherein, the resource reservation field in the sidelink control information is set by a sidelink semi-persistent scheduling configuration index and an interval between the current scheduled resource and the reserved resource is same with a semi-persistent scheduling interval corresponding to the sidelink semi-persistent scheduling, configuration index.
6. The apparatus according to claim 5 , wherein, a determination of the reserved resource field in the sidelink control information being set by a sidelink semi-persistent scheduling configuration index is based on an active/release indication for sidelink semi-persistent scheduling configuration index in the downlink control information.
7. The apparatus according to claim 3 , wherein, the reserved resource field in the sidelink control information is set according to a resource reservation field in the downlink control information scrambled with sidelink-vehicle-radio network temporary identity received from the base station.
8. The apparatus according to claim 5 , wherein, the reserved resource field in the sidelink control information is set according to a sidelink semi-persistent scheduling configuration field in the downlink control information scrambled with sidelink-semi-persistent scheduling-vehicle-radio network temporary identity received from the base station.
9. The apparatus according to claim 8 , wherein, a determination of the reserved resource field in the sidelink control information being set according to a sidelink semi-persistent scheduling configuration field in the downlink control information is based on an effective indication for the sidelink semi-persistent scheduling configuration field in the downlink control information.
10. The apparatus according to claim 1 , wherein, the information of the reserved resource is transmitted in the case of resource pool sharing between the apparatus and the mode 4 user equipment.
11. An apparatus comprising:
a processor that determines reserved resource on sidelink for a following sidelink transmission; and
a transceiver that, transmits information of the reserved resource to a mode 3 user equipment in downlink control information
wherein, a resource reservation field in the downlink control information scrambled with sidelink-vehicle-radio network temporary identity is used to transmit the information of the reserved resource and set a reserved resource field in sidelink control information.
12. The apparatus according to claim 11 wherein, the resource reservation field in the downlink control information is used to indicate an interval between current scheduled resource and the reserved resource.
13. The apparatus according to claim 12 , the resource reservation field in the downlink control information has a length of 4 bits and is same with a combination of a sidelink semi-persistent scheduling configuration index of 3 bits and an activation/release indication of 1 bit, wherein decimal values 1-10 equivalent of the resource reservation field of 4 bits indicate a corresponding extent of the interval between the current scheduled resource and the reserved resource, a decimal value 11 equivalent of the resource reservation field of 4 bits indicates 0.5 extent of the interval between the current scheduled resource and the reserved resource, a decimal value 12 equivalent of the resource reservation field of 4 bits indicates 0.2 extent of the interval between the current scheduled resource and the reserved resource, and a decimal value 0 equivalent of the resource reservation field of 4 bits indicates that no reserved resource is kept for the following transmission.
14. The apparatus according to claim 11 , wherein, the resource reservation field in the downlink control information is set by a sidelink semi-persistent scheduling configuration index and an interval between the current scheduled resource and the reserved resource is same with a semi-persistent scheduling interval corresponding to the sidelink semi-persistent scheduling configuration index.
15. The apparatus according to claim 14 , wherein, an active/release indication for sidelink semi-persistent scheduling configuration index in the downlink control information is used to indicate whether the reserved resource held in the sidelink control information is set by the sidelink semi-persistent scheduling configuration index.
16. The apparatus according to claim 11 , wherein, a sidelink semi-persistent scheduling configuration field in the downlink control information scrambled with sidelink-semi-persistent scheduling-vehicle-radio network temporary identity is used to transmit the information of the reserved resource, and a sidelink semi-persistent scheduling configuration index included in the SL sidelink semi-persistent scheduling configuration field in the downlink control information is used to set a reserved resource field in sidelink control information.
17. The apparatus according to claim 16 , wherein, an effective indication for the sidelink semi-persistent scheduling configuration field in the downlink control information is used to indicate whether the reserved resource field in the sidelink control information is set according to the sidelink semi-persistent scheduling configuration field in the downlink control information.
18. The apparatus according to claim 11 , wherein, the information of the reserved resource is transmitted in the case of resource pool sharing between the mode 3 user equipment and a mode 4 user equipment.
19. An apparatus comprising:
a transceiver that receives information of reserved resource on sidelink from a mode 3 user equipment in a resource reservation field in sidelink control information; and
a processor that determines existence of resource collision on sidelink.
20. The apparatus according to claim 19 , wherein the processor, performs resource reselection in the case that the reserved resource has collision with resource used by the apparatus for an ongoing sidelink transmission.
21. The apparatus according to claim 19 , wherein the processor excludes the reserved resource from a resource pool if the reserved resource does not have a collision with resource used by the apparatus for an ongoing sidelink transmission.
22. The apparatus according to claim 19 , wherein the transceiver, receives a resource guarantee indication from the mode 3 user equipment which indicates whether the reserved resource indicated in the resource reservation field in the sidelink control information can be occupied by the apparatus.
23. The apparatus according to claim 19 , wherein, the resource reservation field in the sidelink control information indicates an interval between current scheduled resource and the reserved resource.
24. The apparatus according to claim 23 , the resource reservation field in the sidelink control information has a length of 4 bits and is same with a combination of a sidelink semi-persistent scheduling configuration index of 3 bits and an activation/release indication of 1 bit, wherein decimal values 1-10 equivalent of the resource reservation field of 4 bits indicate a corresponding extent of the interval between the current scheduled resource and the reserved resource, a decimal value 11 equivalent of the resource reservation field of 4 bits indicates 0.5 extent of the interval between the current scheduled resource and the reserved resource, a decimal value 12 equivalent of the resource reservation field of 4 bits indicates 0.2 extent of the interval between the current scheduled resource and the reserved resource, and a decimal value 0 equivalent of the resource reservation field of 4 bits indicates that no reserved resource is kept for the following transmission.
25. The apparatus according to claim 19 , wherein, the resource reservation field in the sidelink control information is set by a SL sidelink semi-persistent scheduling configuration index and an interval between the current scheduled resource and the reserved resource is same with a semi-persistent scheduling interval corresponding to the sidelink semi-persistent scheduling configuration index.
26. The apparatus according to claim 19 , wherein, the information of the reserved resource is received in the case of resource pool sharing between the apparatus and the mode 3 user equipment.