Patent ID: 7411983

Claim:
A method for acquiring frame synchronization of a broadcasting channel (BCH) in an asynchronous mobile communication system, the method comprising: acquiring synchronization of a radio frame having a predetermined duration through a synchronization channel; decoding a predetermined position of the radio frame having the predetermined duration for a double duration and performing a Cyclic Redundancy Check (CRC) on the decoding result at a time that the synchronization is acquired wherein when the CRC fails, the CRC is performed by demodulating again from a succeeding 10 msec duration of the CRC 20 msec duration, increasing a CRC counter if the CRC passes, and then determining whether a value of the CRC counter is larger than 2 performing the CRC by demodulating the 20 msec duration after the CRC duration, when the value of the CRC counter is less than 2; acquiring frame synchronization of the BCH if the value of the CRC counter is larger than 2; and if the CRC is consecutively passed at least twice, adding up two frames received from the synchronization acquired time and decoding the added frames for one duration thereby acquiring synchronization of the BCH.