Patent ID: 8184612
Filing Date: 2012-05-22
Classification: H04L,H04W

Abstract:
1. A method for managing a Hyper Frame Number (HFN) for ciphering/deciphering at a Radio Network Controller (RNC) of a mobile communication system, the method comprising: receiving a Timing Adjustment (ToA) value from a base station; correcting a Connection Frame Number (CFN); determining whether correction of the CFN has been generated within the same cycle by comparing a correction CFN with an absolute CFN serving as a reference; determining whether to decrease an HFN value and accordingly decreasing the HFN value in accordance with whether the CFN correction has been generated within the same cycle; and if it is determined not to decrease the HFN value, one of increasing and maintaining the HFN value in accordance with whether the CFN correction has been generated within the same cycle.