A base station for controlling transmission power during the establishment
of a communication channel utilizes the reception of a short code during
initial power ramp-up. The short code is a sequence for detection by the
base station which has a much shorter period than a conventional access
code. The ramp-up starts from a power level that is lower than the
required power level for detection by the base station. The power of the
short code is quickly increased until the signal is detected by the base
station. Once the base station detects the short code, it transmits an
indication that the short code has been detected.