Patent ID: 8320333
Filing Date: 2012-11-27
Classification: H04W

Abstract:
1. In a wireless communication network that uses hyper frame numbers for synchronization, a method of preserving hyper frame number synchronization between a mobile station and a handover target base station, the method comprising: for a given radio bearer, initializing the hyper frame numbers used at the mobile station and at the handover target base station to the same value; selecting a value from two or more possible values in a packet transmission sequence space to be used as a triggering value for incrementing the hyper frame numbers at the mobile station and at the handover target base station; and signaling the selected triggering value between the mobile station and the handover target base station, such that they both operate with the same triggering value; wherein the selecting the value comprises selecting the value that is at or about a maximum distance from a last known or expected value used for transmitting packet data on the given radio bearer with respect to a handover source base station.