Patent ID: 8615245

Claim:
A radio network controller comprising: a determination unit configured to determine a type of transmit diversity method to be used to transmit a signal from a base station to a mobile station, in accordance with a soft handover status of the mobile station; and an instruction unit configured to instruct the type of transmit diversity method to the base station, in accordance with the determination result by the determination unit, wherein the determination unit is configured to determine that the type of transmit diversity method to be used is an open loop transmit diversity, when the mobile station is during inter-base-station soft handover in which the mobile station establishes a plurality of radio links with a plurality of base stations, and the determination unit is configured to determine that the type of transmit diversity method to be used is a closed loop transmit diversity, when the mobile station is during intra-base-station soft handover in which the mobile station establishes a plurality of radio links with a base station, or when the mobile station is not during soft handover.