Patent ID: 8422455

Claim:
A method comprising: a) transmitting a plurality of control format indicators by a base station, said base station configured to communicate employing a plurality of carriers, a control format indicator in said plurality of control format indicators: i) transmitted on a first control channel over the first OFDM symbol in a plurality of OFDM symbols of a first subframe in a plurality of subframes, said plurality of control format indicators transmitted on a first carrier in said plurality of carriers; and ii) indicating a number of OFDM symbols in said first subframe employed for transmission of downlink control information on a second control channel on said first subframe of said first carrier; b) transmitting said downlink control information by said base station on said first subframe of said first carrier, said downlink control information: i) transmitted on said first carrier starting from the first OFDM symbol of said first subframe; and ii) providing first transmission format and scheduling information for a first plurality of data packets to be transmitted on a first data channel of said first carrier, transmission of said first plurality of data packets starting from an OFDM symbol subsequent to said number of OFDM symbols employed for transmission of said downlink control information; c) transmitting at least one control message by said base station, said at least one control message configured to cause, in a wireless device, configuration of radio resources of: i) a second control channel of a second carrier in said plurality of carriers, said radio resources comprising one or more sets of resource blocks in a subset of subframes in said plurality of subframes, said at least one control message indicating, for at least one of said one or more sets of resource blocks: (1) a starting OFDM symbol in a second subframe of said subset of subframes; and (2) a frequency allocation in terms of resource blocks in said second subframe; and ii) a second data channel of said second carrier to start from said starting OFDM symbol of said second subframe; d) transmitting second transmission format and scheduling information by said base station on said second control channel in said second subframe, said second transmission format and scheduling information being for one or more second data packets to be transmitted on said second data channel; and e) transmitting said one or more second data packets by said base station on said second data channel in said second subframe.