Power scaling of uplink signals in a transmission burst

1. A method comprising:

determining, by a wireless device, a total transmission power for transmission of uplink signals in a subframe of subframes of an uplink transmission burst;

scaling, based on a subframe position of the subframe in the subframes of the uplink transmission burst, a transmission power value of an uplink signal of the uplink signals in response to the total transmission power exceeding a first value so that an updated total transmission power does not exceed the first value; and

transmitting the uplink signal in the subframe and with the transmission power value.

2. The method of claim 1 , further comprising receiving downlink control information indicating resource assignments for transmission of the uplink transmission burst.

3. The method of claim 2 , wherein the downlink control information comprises:

a resource assignment field indicating resource blocks in the subframes of the uplink transmission burst; and

a transmit power control field indicating a power control value for determining the transmission power value of the uplink signal.

4. The method of claim 2 , wherein the downlink control information comprises a field indicating a number of subframes in the subframes of the uplink transmission burst.

5. The method of claim 2 , wherein the downlink control information comprises one or more fields indicating transmission parameters of the uplink signal.

6. The method of claim 1 , wherein the scaling is based on whether the subframe position is the earliest subframe of the subframes of the uplink transmission burst.

7. The method of claim 1 , further comprising performing a listen before talk procedure prior to a transmission of the uplink transmission burst.

8. The method of claim 1 , further comprising receiving one or more messages comprising the first value.

9. The method of claim 1 , wherein the uplink signal comprises at least one of:

an uplink shared channel signal; or

an uplink sounding reference signal.

10. The method of claim 1 , wherein the transmitting the uplink signal is via cells comprising unlicensed cells.

11. 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:

determine a total transmission power for transmission of uplink signals in a subframe of subframes of an uplink transmission burst;

scale, based on a subframe position of the subframe in the subframes of the uplink transmission burst, a transmission power value of an uplink signal of the uplink signals in response to the total transmission power exceeding a first value so that an updated total transmission power does not exceed the first value; and

transmit the uplink signal in the subframe and with the transmission power value.

12. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive downlink control information indicating resource assignments for transmission of the uplink transmission burst.

13. The wireless device of claim 12 , wherein the downlink control information comprises:

a resource assignment field indicating resource blocks in the subframes of the uplink transmission burst; and

a transmit power control field indicating a power control value for determining the transmission power value of the uplink signal.

14. The wireless device of claim 12 , wherein the downlink control information comprises a field indicating a number of subframes in the subframes of the uplink transmission burst.

15. The wireless device of claim 12 , wherein the downlink control information comprises one or more fields indicating transmission parameters of the uplink signal.

16. The wireless device of claim 11 , wherein the scaling is based on whether the subframe position is the earliest subframe of the subframes of the uplink transmission burst.

17. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to perform a listen before talk procedure prior to a transmission of the uplink transmission burst.

18. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive one or more messages comprising the first value.

19. The wireless device of claim 11 , wherein the uplink signal comprises at least one of:

an uplink shared channel signal; or

an uplink sounding reference signal.

20. The wireless device of claim 11 , wherein the transmission of the uplink signal is via cells comprising unlicensed cells.