Method and system for mobile communications

The present invention relates to a method for determining a radio zone and an uplink transmission power, wherein each of base stations transmits broadcast information indicating a perch channel transmission power level and an uplink interference level via a corresponding perch channel, and a mobile station receives the broadcast information from near base stations around the mobile station, detects respective reception levels of the perch channels for the near base stations, calculates respective path losses between the mobile station and respective near base stations on the basis of the respective reception levels and the respective perch channel transmission power levels within the broadcast information, calculates respective uplink transmission power levels between the mobile station and respective near base stations on the basis of the calculated respective path losses, the respective uplink interference levels within the broadcast information, and required signal-to-interference ratios involved in reception by the near base stations, selects a radio zone in which the necessary uplink transmission power level is minimum among the respective necessary uplink transmission power levels, the base station of the selected radio zone being ready for communication with the mobile station or being able to commence communication with the mobile station after handover, and controls an uplink transmission power in the selected radio zone based on the necessary uplink transmission power level of the selected radio zone.