Patent ID: 7450582
Filing Date: 2008-11-11
Classification: H04L,H04W

Abstract:
1. A method for calculating a cost of a mobile node (MN) in an Internet Protocol (IP) network communicating with the MN having a mobile IP and including a plurality of access routers, the method comprising the steps of: if the MN moves to a new access router, generating by the MN a distance measurement request message including an initial hop limit field value and a hop limit value and transmitting to an access router serving as a regional anchor point (RAP) of the MN the generated distance measurement request message; upon receiving the distance measurement request message, calculating, by the access router serving as the RAP, a hop count using the initial hop limit field value and the hop limit value, and sending to the MN as an acknowledgement signal the calculated hop count; and generating by the MN a binding update message and sending to a correspondent node and a home agent the generating binding update message, if it is determined from the hop count that a distance between the new access router and the RAP exceeds a distance limitation.