Patent ID: 7912493

Claim:
A base-station selection transmission power control method for controlling downlink transmission from each of a plurality of base stations to a mobile station depending on a base station identification received from the mobile station, wherein the mobile station and the plurality of base stations are in a soft handover state, wherein the mobile station selects one or more primary base station from the plurality of base stations to generate the base station identification and transmits the base station identification to the plurality of base stations, wherein, at each of the plurality of base stations receiving the base station identification, when the received base station identification indicates the base station, the base station sets its own state to a primary base station state to normally perform the downlink transmission and, when the received base station identification does not indicate the base station, the base station sets the own state to a non-primary base station state to halt or suppress the downlink transmission, wherein each of the plurality of base stations updates its own state at a slot number (j+Tos) mod Fn (where Tos is number of waiting slots and Fn is number of slots included in a single frame), which is determined based on a slot number j at which the base station identification is received from the mobile station.