Patent ID: 8913592

Claim:
A method comprising: a) receiving, by a serving base station, a first message from a wireless device on a carrier, said first message comprising one or more parameters implicitly or explicitly indicating whether said wireless device supports configuration of: i) a maximum of k channel state information reference signals for said carrier, k being an integer greater than one; and ii) a maximum of n channel state information interference measurement resources for said carrier, n being an integer greater than one; b) transmitting, by said serving base station to said wireless device, at least one second message, at least some parameters in said at least one second message depend at least in part on said first message, said at least one second message: i) comprising: (1) one or more channel state information reference signals parameters; (2) one or more channel state information interference measurement resources parameters; and (3) a plurality of measurement parameters; ii) configured to cause: (1) configuration of j channel state information reference signals for said carrier, j being an integer smaller than or equal to k; and (2) configuration of m channel state information interference measurement resources for said carrier, m being an integer smaller than or equal to n; and (3) said wireless device measuring signal quality of at least one carrier of one or more target base stations in response to said measurement parameters; c) receiving, by said serving base station, at least one measurement report from said wireless device in response to said at least one second message, said at least one measurement report comprising signal quality information of at least one carrier 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, by said serving base station, based at least in part on said at least one measurement report; e) transmitting, by said serving base station, in response to said serving base station making a handover decision for said wireless device, at least one third message to at least one target base station, said at least one third message comprising: i) said one or more parameters implicitly or explicitly indicating whether said wireless device supports said configuration of: (1) said maximum of k channel state information reference signals; and (2) said maximum of n channel state information interference measurement resources; ii) configuration parameters of: (1) said j channel state information reference signals for said carrier; and (2) said m channel state information interference measurement resources for said carrier.