Patent ID: 8483172

Claim:
A base station comprising: a) one or more communication interfaces; b) one or more processors; and c) memory storing instructions that, when executed, cause said base station to: i) transmit downlink control information, said downlink control information: (1) transmitted on a first carrier in a plurality of carriers starting from the first OFDM symbol in a plurality of OFDM symbols of a first subframe in a plurality of subframes of said first carrier; and (2) providing first transmission format and scheduling information for a first plurality of data packets transmitted on a first data channel of said first carrier; ii) transmit at least one control message to a wireless device, said at least one control message configured to cause, in said wireless device, configuration of: (1) first radio resources of a second control channel of a second carrier in said plurality of carriers, said first 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: (a) a starting OFDM symbol of said second control channel in said subset of subframes; and (b) a frequency allocation for said second control channel in terms of resource blocks in said subset of subframes; and (2) second radio resources of a second data channel of said second carrier to start from said starting OFDM symbol in said subset of subframes; iii) transmit second scheduling information on said second control channel in a second subframe of said subset of subframes, said scheduling information being for one or more second data packets transmitted on said second data channel of said second carrier; and iv) transmit said one or more second data packets to said wireless device on said second data channel in said second subframe according to said scheduling information.