Patent ID: 7242959
Filing Date: 2007-07-10
Classification: H04B,H04W

Abstract:
1. A method for controlling transmission power of a downlink signal which is transmitted in frames from a base station to a mobile station depending on a base station selection signal, wherein the mobile station selects at least one primary base station among a plurality of base stations which are connected to the mobile station for soft handover to produce the base stations selection signal designating said at least on primary base station, wherein an uplink signal including the base station selection signal is transmitted in frames to the base stations, the method comprising the steps of: at each of the base stations, a) receiving the uplink signal including the base station selection signal from the mobile station; b) determining a transmission power update timing so that the downlink signal received at the mobile station changes in transmission power at a predetermined timing synchronized with that of other base stations; and c) when reaching the transmission power update timing, setting the transmission power of the downlink signal to a selected one of a normally controlled level and a minimum level depending on the base station selection signal.