Counter initialization, particularly for radio frames

A protection barrier at least two core network wireless network access method in service. The method comprises: Maintaining a core network special protocol authentication radio carrier special encryption processing, and generating counting parameter (C) is an encryption processing, comprising a periodic sequence serial number (43) and when the periodic sequence serial number (43) completes a device is the serial number (HFN) of each time is progressively. Of each core network or a authentication protocol, a surpassing the rotating HFN HFN preset (5-8) session's first radio carrier in the preceding for session. When a novel radio carrier are arranged, mobile station for the core network to the is 5-10) is rotating HFN of for session, then progressively (5-12 the) and HFN (5-14) is provided with a novel radio carrier with a preset the counting parameter. When a session ended, mobile station memory (5-16) is rotating HFN at least a part of the session (41).