A mobile station for communicating with a radio base station including one or more cells, the mobile station communicating over a shared physical channel for communicating with one cell of the one or more cells and a dedicated physical channel for communicating with a plurality of the one or more cells simultaneously, wherein a closed loop transmit diversity for transmission with use of a plurality of antennas is applied to the radio base station, characterised by: a feedback information control unit for determining whether the mobile station is communicating to multiple cells in handover within a base station, that is, intra-BS handover, or in handover between base stations (403b, 403c), that is, inter-BS handover, calculating antenna weights of the antennas based on the determination, and generating feedback information based on the calculated antenna weights, wherein the feedback information control unit is configured to generate the feedback information by means of a vector w such that a parameter P in a formula is maximized: P = w ̲ H α H 1 H H 1 + 1 − α H 2 H H 2 + H 3 H H 3 +... w ̲ where H 1 is an estimated channel impulse response regarding the cell communicating to the shared physical channel, and H 2, H 3,... are estimated channel impulse responses regarding the cells communicating to the dedicated physical channel, wherein if the mobile station is communicating to the multiple cells in inter-BS handover, the feedback information control unit sets the value of α to a value optimized for the dedicated physical channel, and if the mobile station is communicating to multiple cells in intra-BS handover, the feedback information control unit sets the value of α to a value optimized for the shared physical channel. a feedback information control unit for determining whether the mobile station is communicating to multiple cells in handover within a base station, that is, intra-BS handover, or in handover between base stations (403b, 403c), that is, inter-BS handover, calculating antenna weights of the antennas based on the determination, and generating feedback information based on the calculated antenna weights, wherein the feedback information control unit is configured to generate the feedback information by means of a vector w such that a parameter P in a formula is maximized: P = w ̲ H α H 1 H H 1 + 1 − α H 2 H H 2 + H 3 H H 3 +... w ̲ where H 1 is an estimated channel impulse response regarding the cell communicating to the shared physical channel, and H 2, H 3,... are estimated channel impulse responses regarding the cells communicating to the dedicated physical channel, wherein if the mobile station is communicating to the multiple cells in inter-BS handover, the feedback information control unit sets the value of α to a value optimized for the dedicated physical channel, and if the mobile station is communicating to multiple cells in intra-BS handover, the feedback information control unit sets the value of α to a value optimized for the shared physical channel. determining whether the mobile station is communicating to multiple cells in handover within a base station, that is, intra-BS handover, or in handover between base stations (403b, 403c), that is, inter-BS handover, calculating antenna weights of the antennas based on the determination, and generating feedback information based on the calculated antenna weights,