SYSTEM FOR CONTROLLING INITIAL POWER RAMP-UP IN CDMA SYSTEM BY USING SHORT CODES

摘要

PROBLEM TO BE SOLVED: To improve a control method of transmission power ramp-up during the establishment of a communication channel in a CDMA communication system from a subscriber unit to a base station.

SOLUTION: The system and method for controlling transmission power during the establishment of a channel in the CDMA communication system utilizes transmission of a short code from the subscriber unit to the base station at initial transmission power ramp-up. The short code is a sequence for detection by the base station which has a much shorter period than a conventional spreading code. The ramp-up starts from a power level that is guaranteed to be lower than the required power level for detection by the base station. The subscriber unit quickly increases transmission power while repeatedly transmitting the short code until the signal is detected by the base station. Once the base station detects the short code, it sends an indication to the subscriber unit to cease increasing transmission power.

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