Techniques and apparatuses for sidelink transmissions in unlicensed bands based on priority values

1 . 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, from a base station, one or more radio resource control (RRC) messages comprising configuration parameters of one or more sidelink resource pools configured for a shared spectrum channel access;

receive, from a second wireless device, sidelink control information (SCI) via the one or more sidelink resource pools, wherein the SCI indicates:

one or more sidelink slots that are in a channel occupancy time (COT) initiated by the second wireless device;

a first reserved resource, in a first slot of the one or more sidelink resource pools, for a first sidelink transmission of the second wireless device;

a first channel access priority class (CAPC) value; and

a first priority value for the first sidelink transmission;

determine at least one second resource, prohibited from being used for a second sidelink transmission of the first wireless device, based on:

the first slot of the first reserved resource; and

a listen-before-talk (LBT) procedure prior to the second sidelink transmission; and

transmit, via a third sidelink resource in the one or more sidelink slots, the second sidelink transmission comprising sidelink data, wherein the second sidelink transmission is transmitted based on:

a second CAPC value, of the sidelink data, being lower than the first CAPC value; and

the third sidelink resource being selected, by the first wireless device, based on a threshold determined using the first priority value of the first sidelink transmission and a second priority value of the second sidelink transmission, wherein the at least one second resource does not comprise the third sidelink resource.

2 . The first wireless device of claim 1 , wherein the configuration parameters further indicate:

a sidelink bandwidth part (BWP) comprising the one or more sidelink resource pools; and

the shared spectrum channel access is for the sidelink BWP.

3 . The first wireless device of claim 1 , wherein the instructions further cause the first wireless device to receive a physical sidelink shared channel (PSSCH) comprising the SCI.

4 . The first wireless device of claim 1 , wherein the SCI further indicates COT sharing information of the COT initiated by the second wireless device.

5 . The first wireless device of claim 1 , wherein the SCI further indicates:

a remaining time duration of the COT; and

the remaining time duration of the COT comprises the one or more sidelink slots.

6 . The first wireless device of claim 1 , wherein the instructions further cause the first wireless device to transmit the second sidelink transmission to a third wireless device.

7 . The first wireless device of claim 1 , wherein the instructions further cause the first wireless device to determine a third wireless device as a destination wireless device for the second sidelink transmission, based on the third wireless device having the sidelink data for transmission.

8 . The first wireless device of claim 1 , wherein the instructions further cause the first wireless device to select, from a candidate resource set in the one or more sidelink resource pools, the third sidelink resource for the second sidelink transmission and based on the second priority value.

9 . A method comprising:

receiving, by a first wireless device from a base station, one or more radio resource control (RRC) messages comprising configuration parameters of one or more sidelink resource pools configured for a shared spectrum channel access;

receiving, by the first wireless device and from a second wireless device, sidelink control information (SCI) via the one or more sidelink resource pools, wherein the SCI indicates:

one or more sidelink slots that are in a channel occupancy time (COT) initiated by the second wireless device;

a first reserved resource, in a first slot of the one or more sidelink resource pools, for a first sidelink transmission of the second wireless device;

a first channel access priority class (CAPC) value; and

a first priority value for the first sidelink transmission;

determining at least one second resource, prohibited from being used for a second sidelink transmission of the first wireless device, based on:

the first slot of the first reserved resource; and

a listen-before-talk (LBT) procedure prior to the second sidelink transmission; and

transmitting, by the first wireless device and via a third sidelink resource in the one or more sidelink slots, the second sidelink transmission comprising sidelink data, wherein the transmitting is based on:

a second CAPC value, of the sidelink data, being lower than the first CAPC value; and

the third sidelink resource being selected, by the first wireless device, based on a threshold determined using the first priority value of the first sidelink transmission and a second priority value of the second sidelink transmission, wherein the at least one second resource does not comprise the third sidelink resource.

10 . The method of claim 9 , wherein the configuration parameters further indicate:

a sidelink bandwidth part (BWP) comprising the one or more sidelink resource pools; and

the shared spectrum channel access is for the sidelink BWP.

11 . The method of claim 9 , further comprising receiving, by the first wireless device, a physical sidelink shared channel (PSSCH) comprising the SCI.

12 . The method of claim 9 , wherein the SCI further indicates COT sharing information of the COT initiated by the second wireless device.

13 . The method of claim 9 , wherein the SCI further indicates:

a remaining time duration of the COT; and

the remaining time duration of the COT comprises the one or more sidelink slots.

14 . The method of claim 9 , further comprising transmitting the second sidelink transmission to a third wireless device.

15 . The method of claim 9 , further comprising determining a third wireless device as a destination wireless device for the second sidelink transmission, based on the third wireless device having the sidelink data for transmission.

16 . The method of claim 9 , further comprising selecting, from a candidate resource set in the one or more sidelink resource pools, the third sidelink resource for the second sidelink transmission and based on the second priority value.

17 . A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a first wireless device, cause the first wireless device to:

receive, from a base station, one or more radio resource control (RRC) messages comprising configuration parameters of one or more sidelink resource pools configured for a shared spectrum channel access;

receive, from a second wireless device, sidelink control information (SCI) via the one or more sidelink resource pools, wherein the SCI indicates:

one or more sidelink slots that are in a channel occupancy time (COT) initiated by the second wireless device;

a first reserved resource, in a first slot of the one or more sidelink resource pools, for a first sidelink transmission of the second wireless device;

a first channel access priority class (CAPC) value; and

a first priority value for the first sidelink transmission;

determine at least one second resource, prohibited from being used for a second sidelink transmission of the first wireless device, based on:

the first slot of the first reserved resource; and

a listen-before-talk (LBT) procedure prior to the second sidelink transmission; and

transmit, via a third sidelink resource in the one or more sidelink slots, the second sidelink transmission comprising sidelink data, wherein the second sidelink transmission is transmitted based on:

a second CAPC value, of the sidelink data, being lower than the first CAPC value; and

the third sidelink resource being selected, by the first wireless device, based on a threshold determined using the first priority value of the first sidelink transmission and a second priority value of the second sidelink transmission, wherein the at least one second resource does not comprise the third sidelink resource.

18 . The non-transitory computer-readable medium of claim 17 , wherein the configuration parameters further indicate:

a sidelink bandwidth part (BWP) comprising the one or more sidelink resource pools; and

the shared spectrum channel access is for the sidelink BWP.