Uplink power control for a secondary cell in carrier aggregation

1. A method comprising:

receiving, by a wireless device, at least one message comprising configuration parameters of a physical uplink control channel (PUCCH) secondary cell with a secondary PUCCH;

transmitting first uplink control information (UCI) on the secondary PUCCH employing an adjustment factor, the adjustment factor is determined based on a received first transmit power control command for the secondary PUCCH;

receiving a first media access control (MAC) command indicating deactivation of the PUCCH secondary cell;

in response to the deactivation of the PUCCH secondary cell, stopping transmission of uplink signals on the PUCCH secondary cell and storing a current value of the adjustment factor determined based on the received first transmit power control command;

receiving a second transmit power control command for the secondary PUCCH;

ignoring the second transmit power control command for the secondary PUCCH when the PUCCH secondary cell is in a deactivated state;

receiving a second MAC command indicating activation of the PUCCH secondary cell; and

after the activation of the PUCCH secondary cell, transmitting a second UCI on the secondary PUCCH employing the stored current value of the adjustment factor.

2. The method of claim 1 , further comprising:

transmitting a random access preamble on the PUCCH secondary cell; and

initializing the adjustment factor employing a transmit power control value received in a random access response to the random access preamble.

3. The method of claim 1 , further comprising:

transmitting a random access preamble on the PUCCH secondary cell; and

initializing the adjustment factor employing at least one power ramp-up value.

4. The method of claim 1 , wherein the at least one message comprises configuration parameters of a plurality of cells grouped into a plurality of PUCCH groups comprising:

a primary PUCCH group comprising a primary cell with a primary PUCCH transmitted to a base station; and

a secondary PUCCH group comprising the PUCCH secondary cell with the secondary PUCCH transmitted to the base station.

5. The method of claim 1 , wherein the first transmit power control command is received on a common search space of a primary cell.

6. The method of claim 1 , wherein the first transmit power control command is received on a dedicated search space of a secondary cell.

7. The method of claim 1 , wherein the at least one message comprises random access resource parameters of the PUCCH secondary cell.

8. The method of claim 1 , wherein the at least one message comprises a pathloss reference parameter indicating a pathloss reference cell of the PUCCH secondary cell.

9. The method of claim 1 , further comprising ignoring, by the wireless device, the first power control command for the secondary PUCCH when the PUCCH secondary cell is in a timing advance group that is not uplink synchronized.

10. 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 at least one message comprising configuration parameters of a physical uplink control channel (PUCCH) secondary cell with a secondary PUCCH;

transmit first uplink control information (UCI) on the secondary PUCCH employing an adjustment factor, the adjustment factor is determined based on a received first transmit power control command for the secondary PUCCH;

receive a first media access control (MAC) command indicating deactivation of the PUCCH secondary cell;

in response to the deactivation of the PUCCH secondary cell, stop transmission of uplink signals on the PUCCH secondary cell and store a current value of the adjustment factor determined based on the received first transmit power control command;

receive a second transmit power control command for the secondary PUCCH;

ignore the second transmit power control command for the secondary PUCCH when the PUCCH secondary cell is in a deactivated state;

receive a second MAC command indicating activation of the PUCCH secondary cell; and

after the activation of the PUCCH secondary cell, transmit a second UCI on the secondary PUCCH employing the stored current value of the adjustment factor.

11. The wireless device of claim 10 , wherein the transmit power control command is received via a group power control command on a common search space of a primary cell.

12. The wireless device of claim 10 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to initialize the adjustment factor employing a transmit power control value received in a random access response if the wireless device transmits a random access preamble on the PUCCH secondary cell.

13. The wireless device of claim 10 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to initialize the adjustment factor employing at least one power ramp-up value if the wireless device transmits a random access preamble on the PUCCH secondary cell.

14. The wireless device of claim 10 , wherein the at least one message comprises configuration parameters of a plurality of cells grouped into a plurality of PUCCH groups comprising:

a primary PUCCH group comprising a primary cell with a primary PUCCH transmitted to a base station; and

a secondary PUCCH group comprising the PUCCH secondary cell with the secondary PUCCH transmitted to the base station.

15. The wireless device of claim 10 , wherein the first transmit power control command is received on a common search space of a primary cell.

16. The wireless device of claim 10 , wherein the first transmit power control command is received on a dedicated search space of a secondary cell.

17. The wireless device of claim 10 , wherein the at least one message comprises random access resource parameters of the PUCCH secondary cell.

18. The wireless device of claim 10 , wherein the at least one message comprises a pathloss reference parameter indicating a pathloss reference cell of the PUCCH secondary cell.

19. The wireless device of claim 10 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to ignore the first power control command for the secondary PUCCH when the PUCCH secondary cell is in a timing advance group that is not uplink synchronized.