Patent ID: 7532601
Filing Date: 2009-05-12
Classification: H04L,H04W

Abstract:
1. A transmission power control method for controlling the transmission power of packet signals to be transmitted from a mobile station via an upstream radio channel, in a radio communication system for allowing radio communications between a base station and a plurality of mobile stations via code division multiple access (CDMA) radio channels, the method comprising: measuring the traffic volume of the packet signals in the base station; switching between a first control method and a second control method based on the measured traffic volume in the base station, the first control method controlling the transmission power so as to keep the received power of the packet signals in the upstream radio channels constant, the second control method controlling the transmission power so as to keep a ratio between the received power of the packet signals and the interference power in the upstream radio channels constant; transmitting a notification signal for notifying the measured traffic volume of the packet signals and the control method selected by the switching; and judging whether to transmit an acknowledgement signal indicating that a received power of an access control signal received from the mobile station satisfies a predetermined condition.