SYSTEM FOR CONTROLLING TRANSMISSION POWER RISE IN WIRELESS CDMA SYSTEM BY USE OF SHORT CODES

摘要

PROBLEM TO BE SOLVED: To improve a method for controlling transmission power rise during setting of a communication channel between a subscriber unit and a base station in a wireless CDMA communication system.

SOLUTION: A system and a method for controlling transmission power during setting of a channel in a CDMA communication system utilize transmission of a short code from a subscriber unit to a base station during initial transmission power rise. The short code, which has a much shorter period than a conventional spreading code, is a sequence for detection by the base station. The transmission power rise starts from a transmission power level being ensured that the transmission power level is lower than a required transmission power level for detection by the base station. The subscriber unit quickly increases the transmission power while repeatedly transmitting the short code until a signal is detected by the base station. Once the base station detects the short code, the base station sends an instruction to the subscriber unit to cease the transmission power rise.

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