Patent ID: 8531990

Claim:
A method comprising: a) receiving, by a serving base station, a first radio resource control (RRC) message from a wireless device, said first RRC message comprising one or more parameters indicating whether said wireless device supports an enhanced physical downlink control channel (ePDCCH), said ePDCCH being a downlink channel configured to carry scheduling information for a plurality of downlink packets and a plurality of uplink packets; b) transmitting, by said serving base station, selectively and if said one or more parameters indicates support of said ePDCCH, at least one second RRC message configured to cause, in said wireless device, configuration of: i) first radio resources of a first ePDCCH of a first carrier, said first radio resources comprising one or more sets of resource blocks in a subset of subframes in a plurality of subframes, said at least one second RRC message indicating frequency resources for said first ePDCCH in terms of resource blocks in said subset of subframes; ii) second radio resources of a first data channel, said first radio resources and said second radio resources starting from the same OFDM symbol of each subframe in said subset of subframes; and iii) measurement parameters for measuring signal quality of at least one carrier of one or more target base stations; c) receiving, by said serving base station, at least one measurement report from said wireless device, said at least one measurement report comprising signal quality information of at least one of said at least one carrier of at least one of said one or more target base stations, said signal quality information derived at least in part employing measurements of at least one OFDM subcarrier; d) making a handover decision for said wireless device, by said serving base station, based at least in part on said at least one measurement report; and e) transmitting, by said serving base station and in response to said serving base station making said handover decision, at least one third message to at least one target base station, said at least one third message comprising at least one of: i) said one or more parameters indicating whether said wireless device supports said ePDCCH; and ii) configuration information of said first ePDCCH of said first carrier.