Secondary cell activation

1. 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 configuration parameters of cells grouped into physical uplink control channel (PUCCH) groups comprising:

a primary PUCCH group comprising a primary cell; and

a secondary PUCCH group comprising a PUCCH secondary cell with a secondary PUCCH;

receive, during a first time interval, a first indication to activate a secondary cell of the primary PUCCH group;

start transmission of channel state information of the secondary cell from a second time interval that is a pre-determined number of time intervals after the first time interval;

receive, during a third time interval, a second indication for activation of the PUCCH secondary cell; and

start transmission of channel state information for the PUCCH secondary cell from a fourth time interval that is a number of time intervals after the third time interval, wherein the number is based on when the wireless device successfully detects the PUCCH secondary cell.

2. The wireless device of claim 1 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to start transmission of channel state information of a first secondary cell of the secondary PUCCH group from the fourth time interval, wherein a control element further indicates activation of the first secondary cell.

3. The wireless device of claim 1 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to employ a next available uplink resource for transmitting the channel state information for the PUCCH secondary cell if there are no uplink resources for transmitting the channel state information for the PUCCH secondary cell in the fourth time interval.

4. The wireless device of claim 1 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to start transmission of channel state information of an activated cell of the secondary PUCCH group from the fourth time interval.

5. The wireless device of claim 1 , wherein the PUCCH secondary cell remains detectable during a cell activation delay.

6. The wireless device of claim 1 , wherein the PUCCH secondary cell is detected on a first attempt.

7. The wireless device of claim 1 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to transmit channel state information comprising an out of range channel quality index when no valid channel state information field with a channel quality index different from zero is available.

8. The wireless device of claim 1 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:

start a first deactivation timer associated with the secondary cell in the second time interval; and

start a second deactivation timer associated with the PUCCH secondary cell in a fifth time interval that is eight time intervals after the third time interval.

9. The wireless device of claim 8 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to start transmission of channel state information of a first secondary cell of the secondary PUCCH group from the fourth time interval, wherein a control element further indicates activation of the first secondary cell.

10. The wireless device of claim 9 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to employ a next available uplink resource for transmitting the channel state information for the PUCCH secondary cell if there are no uplink resources for transmitting the channel state information for the PUCCH secondary cell in the fourth time interval.

11. A base station comprising:

one or more processors; and

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

transmit, to a wireless device, configuration parameters of cells grouped into physical uplink control channel (PUCCH) groups comprising:

a primary PUCCH group comprising a primary cell; and

a secondary PUCCH group comprising a PUCCH secondary cell with a secondary PUCCH;

transmit, during a first time interval, a first indication to activate a secondary cell of the primary PUCCH group;

start reception of channel state information of the secondary cell from a second time interval that is a pre-determined number of time intervals after the first time interval;

transmit, during a third time interval, a second indication for activation of the PUCCH secondary cell; and

start reception of channel state information for the PUCCH secondary cell from a fourth time interval that is a number of time intervals after the third time interval, wherein the number is based on when the wireless device successfully detects the PUCCH secondary cell.

12. The base station of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the base station to start reception of channel state information of a first secondary cell of the secondary PUCCH group from the fourth time interval, wherein a control element further indicates activation of the first secondary cell.

13. The base station of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the base station to employ a next available uplink resource for receiving the channel state information for the PUCCH secondary cell if there are no uplink resources for receiving the channel state information for the PUCCH secondary cell in the fourth time interval.

14. The base station of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the base station to start reception of channel state information of an activated cell of the secondary PUCCH group from the fourth time interval.

15. The base station of claim 11 , wherein the PUCCH secondary cell remains detectable during a cell activation delay.

16. The base station of claim 11 , wherein the PUCCH secondary cell is detected on a first attempt.

17. The base station of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the base station to receive channel state information comprising an out of range channel quality index when no valid channel state information field with a channel quality index different from zero is available.

18. The base station of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:

start a first deactivation timer associated with the secondary cell in the second time interval; and

start a second deactivation timer associated with the PUCCH secondary cell in a fifth time interval that is eight time intervals after the third time interval.

19. The base station of claim 18 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to start transmission of channel state information of a first secondary cell of the secondary PUCCH group from the fourth time interval, wherein a control element further indicates activation of the first secondary cell.

20. A system comprising:

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 a base station, configuration parameters of cells grouped into physical uplink control channel (PUCCH) groups comprising:

a primary PUCCH group comprising a primary cell; and

a secondary PUCCH group comprising a PUCCH secondary cell with a secondary PUCCH;

receive, during a first time interval, a first indication to activate a secondary cell of the primary PUCCH group;

start transmission of channel state information of the secondary cell from a second time interval that is a pre-determined number of time intervals after the first time interval;

receive, during a third time interval, a second indication for activation of the PUCCH secondary cell; and

start transmission of channel state information for the PUCCH secondary cell from a fourth time interval that is a number of time intervals after the third time interval, wherein the number is based on when the wireless device successfully detects the PUCCH secondary cell; and

the base station, wherein the base station comprises one or more processors and memory storing instructions that, when executed by the one or more processors, cause the base station to:

send, to the wireless device, the configuration parameters of the cells grouped into the physical uplink control channel (PUCCH) groups;

transmit, during the first time interval, the first indication to activate the secondary cell of the primary PUCCH group;

start reception of the channel state information of the secondary cell from the second time interval that is the pre-determined number of time intervals after the first time interval;

transmit, during the third time interval, the second indication for the activation of the PUCCH secondary cell; and

start reception of the channel state information for the PUCCH secondary cell from the fourth time interval that is the number of time intervals after the third time interval.