The present invention discloses one method of detecting validity compression mode type sequence, and the method is used in CDMA system for alien frequency measurement or alien system measurement. The measurement includes the gap occupation conflict detection, and detecting of continuous GAP frame number exceeding allowed maximum value. The method can avoid the starting of invalid compression mode type sequence, raise the success rate of starting compression mode type sequence. The detection is performed within certain length to meet the requirement of system real-time property and ensure the transmission quality of system. |