Resource selection window for sidelink inter-UE coordination
A first wireless device receives, from a second wireless device, a first medium access control (MAC) control element (CE) requesting for an inter-UE coordination between the first wireless device and the second wireless device, wherein the first MAC CE indicates a start time and an end time of a selection window for a resource selection procedure of the second wireless device to select resources for one or more sidelink transmissions by the second wireless device. The first wireless device selects a preferred resource set or a non-preferred resource set during the selection window. The first wireless device transmits, to the second wireless device, a second MAC CE indicating the preferred resource set or the non-preferred resource set for the second wireless device to select resources for the one or more sidelink transmissions. The first wireless device receives the one or more sidelink transmissions.
1. A method comprising:
receiving, by a first wireless device, a radio resource control (RRC) message comprising configuration parameters indicating:
a first reference signal received power (RSRP) threshold value for a resource selection for inter-UE coordination; and
a second RSRP threshold value for a resource selection for transmission by the first wireless device;
receiving, by the first wireless device from a second wireless device, a first medium access control (MAC) control element (CE) requesting for the inter-UE coordination, wherein the first MAC CE indicates a start time and an end time of a selection window for a resource selection procedure of the second wireless device to select resources for one or more sidelink transmissions by the second wireless device;
selecting, by the first wireless device, a non-preferred resource set, wherein the selecting is based on comparing a RSRP, associated with a resource during the selection window, with the first RSRP threshold value for the resource selection for the inter-UE coordination;
transmitting, to the second wireless device, a second MAC CE indicating the non-preferred resource set for the second wireless device to select resources for the one or more sidelink transmissions; and
receiving, by the first wireless device, the one or more sidelink transmissions.
2. The method of claim 1 , wherein:
the end time comprises a first reference time, n+T2, of the selection window;
a slot with a slot index n indicates a time for triggering a second resource selection procedure by the second wireless device for the one or more sidelink transmissions; and
T2 is determined by the second wireless device, based on T2≥T2 min, wherein T2 min is associated with a priority value of the one or more sidelink transmissions.
3. The method of claim 2 , wherein the first reference time is based on a first slot index.
4. The method of claim 2 , wherein:
the start time comprises a second reference time, n+T1, of the selection window;
T1 is determined, by the second wireless device, based on T1≤ T proc,1 ; and
T proc,1 is a maximum processing latency for completing the second resource selection procedure being triggered at the slot index n for the one or more sidelink transmissions.
5. The method of claim 4 , wherein the second reference time is indicated by a second slot index.
6. The method of claim 1 , further comprising determining, by the first wireless device and based on the first MAC CE, the selection window.
7. The method of claim 1 , wherein the selecting of the non-preferred resource set during the selection window is based on a first resource selection procedure.
8. A first wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the first wireless device to:
receive a radio resource control (RRC) message comprising configuration parameters indicating:
a first reference signal received power (RSRP) threshold value for a resource selection for inter-UE coordination; and
a second RSRP threshold value for a resource selection for transmission by the first wireless device;
receive, from a second wireless device, a first medium access control (MAC) control element (CE) requesting for the inter-UE coordination, wherein the first MAC CE indicates a start time and an end time of a selection window for a resource selection procedure of the second wireless device to select resources for one or more sidelink transmissions by the second wireless device;
select a non-preferred resource set, wherein the selecting is based on comparing a RSRP, associated with a resource during the selection window, with the first RSRP threshold value for the resource selection for the inter-UE coordination;
transmit, to the second wireless device, a second MAC CE indicating the non-preferred resource set for the second wireless device to select resources for the one or more sidelink transmissions; and
receive the one or more sidelink transmissions.
9. The first wireless device of claim 8 , wherein:
the end time comprises a first reference time, n+T2, of the selection window;
a slot with a slot index n indicates a time for triggering a second resource selection procedure by the second wireless device for the one or more sidelink transmissions; and
T2 is determined by the second wireless device, based on T2≥T2 min, wherein T2 min is associated with a priority value of the one or more sidelink transmissions.
10. The first wireless device of claim 9 , wherein the first reference time is based on a first slot index.
11. The first wireless device of claim 9 , wherein:
the start time comprises a second reference time, n+T1, of the selection window;
T1 is determined, by the second wireless device, based on T1≤T proc,1 ; and
T proc,1 is a maximum processing latency for completing the second resource selection procedure being triggered at the slot index n for the one or more sidelink transmissions.
12. The first wireless device of claim 11 , wherein the second reference time is indicated by a second slot index.
13. The first wireless device of claim 8 , further comprising determining, by the first wireless device and based on the first MAC CE, the selection window.
14. The first wireless device of claim 8 , wherein the selecting of the non-preferred resource set during the selection window is based on a first resource selection procedure.
15. A non-transitory computer readable medium comprising instructions that, when executed by a processor, cause a first wireless device to:
receive a radio resource control (RRC) message comprising configuration parameters indicating:
a first reference signal received power (RSRP) threshold value for a resource selection for inter-UE coordination; and
a second RSRP threshold value for a resource selection for transmission by the first wireless device;
receive, from a second wireless device, a first medium access control (MAC) control element (CE) requesting for the inter-UE coordination, wherein the first MAC CE indicates a start time and an end time of a selection window for a resource selection procedure of the second wireless device to select resources for one or more sidelink transmissions by the second wireless device;
select a non-preferred resource set, wherein the selecting is based on comparing a RSRP, associated with a resource during the selection window, with the first RSRP threshold value for the resource selection for the inter-UE coordination;
transmit, to the second wireless device, a second MAC CE indicating the non-preferred resource set for the second wireless device to select resources for the one or more sidelink transmissions; and
receive the one or more sidelink transmissions.
16. The computer readable medium of claim 15 , wherein:
the end time comprises a first reference time, n+T2, of the selection window;
a slot with a slot index n indicates a time for triggering a second resource selection procedure by the second wireless device for the one or more sidelink transmissions; and
T2 is determined by the second wireless device, based on T2≥T2 min, wherein T2 min is associated with a priority value of the one or more sidelink transmissions.
17. The computer readable medium of claim 16 , wherein the first reference time is based on a first slot index.
18. The computer readable medium of claim 16 , wherein:
the start time comprises a second reference time, n+T1, of the selection window;
T1 is determined, by the second wireless device, based on T1≤T proc,1 ; and
T proc,1 is a maximum processing latency for completing the second resource selection procedure being triggered at the slot index n for the one or more sidelink transmissions.
19. The computer readable medium of claim 18 , wherein the second reference time is indicated by a second slot index.
20. The computer readable medium of claim 15 , further comprising determining, by the first wireless device and based on the first MAC CE, the selection window.