Patent ID: 8254929

Claim:
A mobile communication method, comprising: performing location registration of a mobile communication apparatus with a home agent managing the movement of the mobile communication apparatus, through access routers; performing the location registration of the mobile communication apparatus with correspondent nodes communicating with the mobile communication apparatus; communicating between the mobile communication apparatus and the correspondent nodes via an optimized path that does not include the home agent; detecting start of handover of the mobile communication apparatus from a current access router to a new access router; determining whether the current access router performs handover processing using fast mobile IP; instructing the correspondent nodes to cancel the location registration of the mobile communication apparatus and to begin communicating via the home agent when the detecting step detects the start of handover, and the determining step determines that the access router does not perform handover processing using the fast mobile IP; and wherein if the determining step determines that the current access router performs handover processing using fast mobile IP, the correspondent nodes are not instructed to cancel the location registration of the mobile communication apparatus.