Patent ID: 6418320
Filing Date: 2002-07-09
Classification: H04W

Abstract:
A method of controlling transmission power in a mobile station which is used in a CDMA cellular mobile radio communication system, said CDMA cellular mobile radio communication system comprising a plurality of base stations each of which transmits a pilot signal pre-assigned to each base station and a control signal for power control of the mobile station, said mobile station successively controlling transmission power in response to the control signal sent from each of the base stations during communication with the base stations, comprising the steps of:detecting, in the mobile station, a level of each pilot signal sent from the plurality of base stations; determining whether or not the mobile stations is connected to the plurality of the base stations; discriminating between a first group of the base stations under connection and a second group of the base stations under non-connection; comparing a first reception level of the pilot signals concerned with the first group of the base stations with a second reception level of the pilot signals concerned with the second group of the base stations to determined whether or not the first reception level is higher than the second reception level; and limiting an increase of the transmission power in the mobile station in response to the second reception level exceeding the first reception level.