Patent ID: RE39735

Claim:
A cellular system using a direct spread code division multiple access system, in which a mobile station performs soft handover with plural base stations, said mobile station comprising: downward reception quality monitoring means for monitoring reception quality of downward signals from the plural base stations that are in the soft handover state; base-station specifying means for comparing reception quality of downward signals from respective base stations monitored at said downward reception quality monitoring means, and for generating a base-station specify signal which specifies a base-station having the best reception quality monitoring result to maintain a signal transmission; multiplexing means for multiplexing the base-station specify signal into an upward signal to be sent to said plural base stations; and reception means for performing combined reception of receive signals from said plural base stations that are in the soft handover state, and said base stations each comprising: demodulation means for demodulating the base-station specify signal multiplexed in the upward signal; and transmission control means for receiving the base-station specifying signal demodulated by said demodulation means, for keeping a downward signal transmission when its own base station is specified in the base-station specify signal, and for stopping a downward signal transmission when its own base station is not specified in the base-station specify signal.