Resource pool sharing between network scheduled UE and autonomous scheduled UE transmissions
A wireless transmit/receive unit (WTRU) operating in an autonomous-scheduled mode may select a first resource from a resource pool. The WTRU may determine that the first resource is reserved for at least one sidelink transmission scheduled via a network-scheduled mode. The WTRU may evaluate the availability of resources in the resource pool based on determining that the first resource is reserved for the sidelink transmission. The WTRU may determine that a resource is available based on a measurement comparison to one or more thresholds. For example, there may be a first threshold for resources reserved by WTRUs operating using the network-scheduled mode and a second threshold for resources reserved by WTRUs operating using the autonomous-scheduled mode. The first threshold may be determined based on the second threshold and an offset value. The WTRU may reselect to a second resource in the resource pool based on the evaluated resource availability.
1. A method implemented in a wireless transmit/receive unit (WTRU), the method comprising:
selecting a first resource from a resource pool, wherein the first resource is associated with a first sidelink scheduling mode, and wherein the first resource is selected based on a scheduling indication;
transmitting a first resource reservation message, wherein the first resource reservation message indicates that the first resource is reserved;
selecting a second resource from the resource pool, wherein the second resource is associated with a second sidelink scheduling mode;
transmitting a second resource reservation message, wherein the second resource reservation message indicates that the second resource is reserved;
determining whether the second resource from the resource pool overlaps with the first resource from the resource pool
based on the determination that the second resource from the resource pool overlaps with the first resource from the resource pool, evaluating availability of resources in the resource pool, wherein:
availability of the first resource in the resource pool is determined based on a comparison of a first measurement to a first threshold, and
availability of the second resource in the resource pool is determined based on a comparison of a second measurement to a second threshold;
re-selecting at least one of the first resource or the second resource from the resource pool based on the evaluated availability of resources; and
re-transmitting at least one of the first resource reservation message or the second resource reservation message based on the re-selection.
2. The method of claim 1 , wherein the second resource reservation message indicates a forward booking of the second resource.
3. The method of claim 1 , wherein transmitting the first resource reservation message comprises transmitting the first resource reservation message via first sidelink control information (SCI), and wherein transmitting the second resource reservation message comprises transmitting the second resource reservation message via second SCI.
4. The method of claim 1 , wherein the second measurement is a second reference signal received power (RSRP) measurement associated with the second resource, and wherein the second resource is considered available if the second RSRP measurement is less than the second threshold.
5. The method of claim 1 , wherein the first measurement is a first RSRP measurement associated with the first resource, and wherein the first resource is considered available if the first RSRP measurement is less than the first threshold.
6. The method of claim 1 , wherein the first threshold is determined based on the second threshold and an offset value, and wherein the first threshold is lower than the second threshold.
7. The method of claim 1 , wherein the scheduling indication is received via SCI, and the SCI comprises an indication indicating that the SCI corresponds to the first sidelink scheduling mode.
8. The method of claim 1 , wherein the method comprises:
reserving the first resource associated with the first sidelink scheduling mode for a sidelink transmission if a comparison of a reference signal received power (RSRP) measurement associated with the first resource is above a third threshold.
9. The method of claim 1 , wherein the method is implemented by the WTRU operating in the second sidelink scheduling mode.
10. The method of claim 1 , wherein the WTRU is a first WTRU, and the scheduling indication is received from at least one of a network or a second WTRU.
11. The method of claim 1 , the method comprises:
re-selecting at least one of the first resource or the second resource from the resource pool such that the first resource and the second resource avoid a collision.
12. A wireless transmit/receive unit (WTRU) comprising:
a processor configured to:
select a first resource from a resource pool, wherein the first resource is associated with a first sidelink scheduling mode, and wherein the first resource is selected based on a scheduling indication;
transmit a first resource reservation message wherein the first resource reservation message indicates that the first resource is reserved;
select a second resource from the resource pool, wherein the second resource is associated with a second sidelink scheduling mode;
transmit a second resource reservation message, wherein the second resource reservation message indicates that the second resource is reserved;
determine whether the second resource from the resource pool overlaps with the first resource from the resource pool;
based on the determination that the second resource from the resource pool overlaps with the first resource from the resource pool, evaluate availability of resources in the resource pool, wherein:
availability of the first resource in the resource pool is determined based on a comparison of a first measurement to a first threshold, and
availability of the second resource in the resource pool is determined based on a comparison of a second measurement to a second threshold;
re-select at least one of the first resource or the second resource from the resource pool based on the evaluated availability of resources; and
re-transmit at least one of the first resource reservation message or the second resource reservation message.
13. The WTRU of claim 12 , wherein the second resource reservation message indicates a forward booking of the second resource.
14. The WTRU of claim 12 , wherein the first resource reservation message is transmitted via first sidelink control information (SCI), and the second resource reservation message is transmitted via second SCI.
15. The WTRU of claim 12 , wherein the second measurement is a second reference signal received power (RSRP) measurement associated with the second resource, and wherein the second resource is considered available if the second RSRP measurement is less than the second threshold.
16. The WTRU of claim 12 , wherein the first measurement is a first RSRP measurement associated with the first resource, and wherein the first resource is considered available if the first RSRP measurement is less than the first threshold.
17. The WTRU of claim 12 , wherein the first threshold is determined based on the second threshold and an offset value, and the first threshold is lower than the second threshold.
18. The WTRU of claim 12 , wherein the scheduling indication is received via sidelink control information (SCI).
19. The WTRU of claim 12 , wherein the WTRU is a first WTRU, and the scheduling indication is received from at least one of a network or a second WTRU.
20. The WTRU of claim 12 , wherein the processor is configured to:
re-reselect at least one of the first resource or the second resource from the resource pool such that the first resource and the second resource avoid a collision.