A base station receives from a wireless device channel state information (CSI) fields of a secondary cell via a first cell of a plurality of cells. The base station transmits in a first subframe a message. The message comprises one or more configuration parameters indicating that CSI transmission resources for the secondary cell is via a second cell different from the first cell. The base station stops, in a second subframe occurring a first quantity of subframes after the first subframe, reception of CSI fields of the secondary cell via the first cell from the wireless device. The base station starts, in a third subframe occurring a second quantity of subframes after the first subframe, reception of CSI fields of the secondary cell via the second cell from the wireless device, wherein the second quantity is greater than the first quantity.