Abstract: A first base station receives an application protocol message from a second base station. The second base station communicates employing at least one backward compatible carrier and at least one non-backward compatible carrier. The application protocol message comprises a identifier of the second base station, cell identifiers, and information identifying a carrier type. The base station operates a wireless device handover based, at least in part, on information in the second application protocol message.

Abstract: A base station transmits downlink control information on a first carrier starting from the first symbol of a first subframe and provides first transmission format and scheduling information for first data packets to be transmitted on a first data channel of the first carrier. The base station transmits control message(s) configuring radio resources of a second control channel of a second carrier. The radio resources comprise one or more sets of resource blocks in a subset of subframes. The control message indicates a starting OFDM symbol in a subframe and a frequency allocation for said second control channel.