Patent ID: 7349715

Claim:
A mobile communication terminal, comprising: a radio unit for receiving a broadcast control channel signal that includes cell information and transmitting a random access channel signal for a call allocation request; a reception power level measurement unit for measuring reception power levels of the broadcast control channel signal received in the radio unit; a transmission power level calculation unit for calculating a transmission power level of the random access channel signal based on the measured reception power levels and the cell information; a key input unit for outputting a signal corresponding to a network connection request by a user; and a controller for acquiring system information after synchronizing with a strongest broadcast control channel signal according to the measured reception power level, and controlling the random access channel signal for the call allocation request to be transmitted at the calculated transmission power level when the signal corresponding to the network connection request is input, wherein the transmission power level (Ptx) of the random access channel signal is calculated by, Ptx =min{ ra−rb −( C +48), PMAX} wherein ra is a maximum transmission power level of the mobile communication terminal, rb is a reception characteristic level of the cell contained in the system information of the acquired corresponding cell, C is a measured reception power level of the broadcast control channel signal, and PMAX is a permissible maximum output power level of the cell.