A wireless device receives, in subframe n, a media-access-control control element indicating activation of a secondary cell in a secondary physical uplink control channel (PUCCH) group. The wireless device starts transmission of channel state information (CSI) fields for the secondary cell from subframe n+8+k. k is equal to zero if the activation of the PUCCH secondary cell is completed before subframe n+8. k is greater than 0 and depends on when the activation of the PUCCH secondary cell is completed if the activation of the PUCCH secondary cell is completed on or after subframe n+8.