Patent ID: 7292853
Filing Date: 2007-11-06
Classification: H04W

Abstract:
1. A synchronization method of subscriber information for a roaming service of wireless private network systems in a multi-zone, the method comprising steps of: (a) performing initial system synchronization by initially synchronizing subscriber information of wireless terminals registered in each wireless private network system with associated wireless private network systems in the multi-zone at system initialization by updating the subscriber information in their respective subscriber information databases and into subscriber information databases of the associated wireless private network systems via a first network; and (b) if it is judged that a wireless terminal registered in a first wireless private network system moved to a service area of a second wireless private network system based upon location information contained in a location registration message received from the wireless terminal, updating, by the second wireless private network system, subscriber information of the wireless terminal into its subscriber information database by re-registrating the location information of the wireless terminal to synchronize the location re-registered subscriber information of the wireless terminal with associated wireless private network systems in the multi-zone via the first network, wherein the initial system synchronization step (a) comprises steps of: