Patent ID: 8126466

Claim:
A method performed by an anchor paging controller for maintaining a current network address for a mobile station in idle mode as the mobile station changes paging groups of different proxy mobile internet protocol (PMIP) enabled access service networks (ASNs) while in idle mode, the method comprising: comparing a network address of a relay paging controller received in a location update request message with a network address stored in a location register of the anchor paging controller of a current ASN to determine whether the mobile station has switched between paging groups of different ASNs while in idle mode; and when the mobile station has switched between paging groups of different ASNs while in idle mode, sending by the anchor paging controller while the mobile station is in idle mode, a handover request message from the anchor paging controller to a proxy mobile client of the mobile station to provide a network address of a foreign agent of a target ASN.