Patent ID: 6157629
Filing Date: 2000-12-05
Classification: H04W

Abstract:
A code division multiple access (CDMA) mobile communication system of automatically changing a frequency, wherein a base transceiver station of the CDMA mobile communication system comprises: a radio frequency card (RFC) for converting an intermediate frequency (IF) signal into a signal of ultrahigh frequency (UHF); band and performing administration, coordination, and monitoring with respect to each module in a radio frequency rack; an analog common card (ACC) for receiving and supplying timing signals to remaining parts of a digital shelf, performing routing between processors for communication with a base control processor (BCP), and supplying system clocks to a channel common card (CCC); a sector interface card (SIC) for combining baseband forward signals, up-converting a combined result into the IF frequency, and supplying timing; and the base control processor (BCP) for periodically checking the states of the RFC, ACC, and SIC thus cutting off parts where errors are detected, detecting a frequency processed by the part having the error and excluding it from overhead data, and, when the frequency is a fundamental frequency, making other part take charge of the fundamental frequency, and, reversely, turning ""ON"" parts which are restored from an error state to a normal state, making the restored part process the fundamental frequency and a part which currently processes the fundamental frequency process its original frequency when the restored part is one for the fundamental frequency originally, and controlling and monitoring each unit constituting the base transceiver station.