Patent ID: 7865209

Claim:
A method for controlling transmission power of a physical random access channel in a mobile communication terminal, the mobile communication terminal setting an initial transmission power according to received signal code power when a preamble of the physical random access channel is transmitted to a mobile communication network, the method comprising the steps of: identifying a wireless channel environment on a basis of a value of the received signal code power when the preamble must be retransmitted; and variably increasing transmission power used in a previous preamble according to the identified wireless channel environment, and setting retransmission power, wherein the setting step includes increasing the retransmission power by a value greater than a predefined power ramping step when the value of the received signal code power is greater than an upper limit value of a reference range, and increasing the retransmission power by a value less than the predefined power ramping step when the value of the received signal code power is less than the lower limit value of the reference range.