Resource retrieve procedure

1. A method comprising:

initializing a candidate resource set,

wherein the candidate resource set comprises a first resource for a sidelink transmission;

determining not to use the first resource for the sidelink transmission, based on:

the first resource being excluded from the candidate resource set; and

a reference signal received power (RSRP) of the first resource being higher than a RSRP threshold,

wherein the RSRP of the first resource is determined based on a received sidelink control information (SCI) of the first resource; and

transmitting the sidelink transmission via a second resource in the candidate resource set,

wherein the second resource does not comprise the first resource;

wherein the first resource is excluded from the candidate resource set based on:

an offset of the first resource from a third resource by at least one reservation period; and

the third resource not being monitored in a sensing window.

2. The method of claim 1 , wherein the initializing of the candidate resource set is for sidelink pre-emption.

3. The method of claim 2 , wherein the candidate resource set comprises candidate resources in a selection window of a resource selection procedure based on the sidelink pre-emption.

4. The method of claim 3 , wherein the sensing window is of the resource selection procedure.

5. The method of claim 4 , further comprising receiving at least one configuration parameter indicating:

the sensing window of the resource selection procedure;

the selection window of the resource selection procedure; and the at least one reservation period for resource reservation.

6. The method of claim 1 , wherein the determining to not use the first resource for the sidelink transmission is based on a first priority level of the first resource indicated in the SCI being higher than a second priority level of the sidelink transmission.

7. The method of claim 6 , wherein a first priority value indicating the first priority level in the SCI is lower than a second priority value indicating the second priority level.

8. The method of claim 1 , wherein the transmitting, via the second resource, the sidelink transmission is based on a RSRP of the second resource being lower than the RSRP threshold.

9. The method of claim 1 , further comprising incrementing the RSRP threshold.

10. A wireless device comprising:

at least one processor;

memory storing instructions that, when executed by the at least one processor, cause the wireless device to:

initialize a candidate resource set,

wherein the candidate resource set comprises a first resource for a sidelink transmission;

determine not to use the first resource for the sidelink transmission, based on:

the first resource being excluded from the candidate resource set; and

a reference signal received power (RSRP) of the first resource being larger than a RSRP threshold,

wherein the RSRP of the first resource is determined based on a received sidelink control information (SCI) of the first resource; and

transmit the sidelink transmission via a second resource in the candidate resource set, wherein the second resource does not comprise the first resource;

wherein the first resource is excluded from the candidate resource set based on:

an offset of the first resource from a third resource by at least one reservation period; and

the third resource not monitored in a sensing window.

11. The wireless device of claim 10 , wherein the candidate resource set is initialized for sidelink pre-emption.

12. The wireless device of claim 11 , wherein the candidate resource set comprises candidate resources in a selection window of a resource selection procedure based on the sidelink pre-emption.

13. The wireless device of claim 12 , wherein the sensing window is of the resource selection procedure.

14. The wireless device of claim 13 , wherein the instructions, when executed by the at least one processor, further cause the wireless device to receive at least one configuration parameters indicating:

the sensing window of the resource selection procedure;

the selection window of the resource selection procedure; and

the at least one reservation period for resource reservation.

15. The wireless device of claim 10 , wherein the instructions, when executed by the at least one processor, further cause the wireless device to determine to not use the first resource for the sidelink transmission based on a first priority level of the first resource indicated in the SCI being higher than a second priority level of the sidelink transmission.

16. The wireless device of claim 15 , wherein a first priority value indicating the first priority level in the SCI is lower than a second priority value indicating the second priority level.

17. The wireless device of claim 10 , wherein the instructions, when executed by the at least one processor, further cause the wireless device to transmit, via the second resource, the sidelink transmission based on a RSRP of the second resource being lower than the RSRP threshold.

18. The wireless device of claim 10 , wherein the instructions, when executed by the at least one processor, cause the wireless device to increment the RSRP threshold.

19. A computer program stored on a non-transitory medium, wherein the computer program when executed on a processor performs the method as claimed in claim 1 .