URLLC in unlicensed bands

1. A method comprising:

receiving, by a wireless device, a downlink control information indicating an assignment for a transport block (TB) or release of a semi-persistent scheduling (SPS) configuration;

wherein the TB or the SPS configuration is associated with a first priority or a second priority; and

transmitting a feedback via an unlicensed cell and based on:

a first value of an unlicensed parameter in response to the TB or the SPS configuration being associated with the first priority; and

a second value of the unlicensed parameter in response to the TB or the SPS configuration being associated with the second priority.

2. The method of claim 1 , wherein the unlicensed parameter is a listen-before-talk (LBT) parameter.

3. The method of claim 2 , wherein the LBT parameter indicates one of a contention window size and a channel access priority class.

4. The method of claim 2 , further comprising performing an LBT procedure, wherein:

the transmitting the feedback is based on the LBT procedure indicating a clear channel;

the LBT procedure is based on the LBT parameter with the first value in response to the TB or the SPS configuration being associated with the first priority; and

the LBT procedure is based on the LBT parameter with the second value in response to the TB or the SPS configuration being associated with the second priority.

5. The method of claim 1 , wherein:

the downlink control information comprises a field; and

a value of the field indicates one of the first priority and the second priority.

6. The method of claim 1 , further comprising receiving configuration parameters, of the SPS configuration, comprising one or more parameters indicating that the SPS configuration is associated with one of the first priority and the second priority.

7. The method of claim 1 , wherein the feedback is a hybrid automatic repeat request feedback.

8. A wireless device comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the wireless device to:

receive a downlink control information indicating an assignment for a transport block (TB) or release of a semi-persistent scheduling (SPS) configuration;

wherein the TB or the SPS configuration is associated with a first priority or a second priority; and

transmit a feedback via an unlicensed cell and based on:

a first value of an unlicensed parameter in response to the TB or the SPS configuration being associated with the first priority; and

a second value of the unlicensed parameter in response to the TB or the SPS configuration being associated with the second priority.

9. The wireless device of claim 8 , wherein the unlicensed parameter is a listen-before-talk (LBT) parameter.

10. The wireless device of claim 9 , wherein the LBT parameter indicates one of a contention window size and a channel access priority class.

11. The wireless device of claim 9 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to perform an LBT procedure, wherein:

transmitting the feedback is based on the LBT procedure indicating a clear channel;

the LBT procedure is based on the LBT parameter with the first value in response to the TB or the SPS configuration being associated with the first priority; and

the LBT procedure is based on the LBT parameter with the second value in response to the TB or the SPS configuration being associated with the second priority.

12. The wireless device of claim 8 , wherein:

the downlink control information comprises a field; and

a value of the field indicates one of the first priority and the second priority.

13. The wireless device of claim 8 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive configuration parameters, of the SPS configuration, comprising one or more parameters indicating that the SPS configuration is associated with one of the first priority and the second priority.

14. The wireless device of claim 8 , wherein the feedback is a hybrid automatic repeat request feedback.

15. A system comprising:

a base station; and

a wireless device comprising: one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the wireless device to receive, from the base station, a downlink control information indicating an assignment for a transport block (TB) or release of a semi-persistent scheduling (SPS) configuration; wherein the TB or the SPS configuration is associated with a first priority or a second priority; and transmit a feedback via an unlicensed cell and based on: a first value of an unlicensed parameter in response to the TB or the SPS configuration being associated with the first priority; and a second value of the unlicensed parameter in response to the TB or the SPS configuration being associated with the second priority.

16. The system of claim 15 , wherein the unlicensed parameter is a listen-before-talk (LBT) parameter.

17. The system of claim 16 , wherein the LBT parameter indicates one of a contention window size and a channel access priority class.

18. The system of claim 16 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to perform an LBT procedure, wherein:

transmitting the feedback is based on the LBT procedure indicating a clear channel;

the LBT procedure is based on the LBT parameter with the first value in response to the TB or the SPS configuration being associated with the first priority; and

the LBT procedure is based on the LBT parameter with the second value in response to the TB or the SPS configuration being associated with the second priority.

19. The system of claim 15 , wherein:

the downlink control information comprises a field; and

a value of the field indicates one of the first priority and the second priority.

20. The system of claim 15 , wherein the feedback is a hybrid automatic repeat request feedback.