TRANSMISSION POWER CONTROL METHOD IN MOBILE COMMUNICATIONS SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a transmission power control method in a CDMA mobile communications system for solving a distance problem by controlling the transmission power of a radio base station or a mobile equipment to be an interference source in the case that the plural mobile communications systems using a direct spread CDMA system coexist. SOLUTION: All the radio base stations 51 and 61 of the coexisting respective systems periodically report interference wave total reception power information and the transmission power information of the control channel to the mobile equipments 52 and 62 of the respective systems by using the respective control channels. By utilizing the information, the mobile equipments 52 and 62 calculate maximum transmission power at the time of starting communication, and in the case that the transmission power at present exceeds the maximum transmission power, lower the transmission power. When it is needed, the maximum transmission power is calculated by receiving the information even after starting the communication.