Method for calculating hop count of mobile ip in an ip network

Abstract

Disclosed is a method for calculating a routing cost or a hop count of a mobile IP (Internet Protocol) in an IP network. The IP network can communicate with the MN having a mobile IP and includes a plurality of access routers. If the MN moves to a new access router, the MN generates a distance measurement request message and transmits the generated distance measurement request message to an access router serving as a regional anchor point (RAP) of the MN. Upon receiving the distance measurement request message, the access router serving as the RAP generates an acknowledgement message having an initial hop limit field value and a hop limit value, and transmits the acknowledgement message. The MN calculates a hop count using the initial hop limit field value and the hop limit value.

1 . A method for calculating a cost by a regional anchor point (RAP) in an Internet Protocol (IP) network capable of communicating with a mobile node (MN) having a mobile IP and including a plurality of access routers, the method comprising the steps of: 
 receiving from the MN a distance measurement request message including an initial hop limit field value and a hop limit value;    calculating a hop count using the initial hop limit field value and the hop limit value included in the received distance measurement request message; and    transmitting an acknowledgement message including the calculated hop count to the MN.    
   
   
       2 . A method for calculating a cost by a regional anchor point (RAP) in an Internet Protocol (IP) network capable of communicating with a mobile node (MN) having a mobile IP and including a plurality of access routers, the method comprising the steps of: 
 receiving a distance measurement request message from the MN; and    generating an acknowledgement message including an initial hop limit field value and a hop limit value and transmitting the generated acknowledgement message.    
   
   
       3 . A method for calculating a cost by a regional anchor point (RAP) in an Internet Protocol (IP) network capable of communicating with a mobile node (MN) having a mobile IP and including a plurality of access routers, the method comprising the steps of: 
 receiving from the MN a distance measurement request message including an initial hop limit field value and a hop limit value;    calculating a first hop count using the initial hop limit field value and the hop limit value included in the received distance measurement request message; and    transmitting to the MN an acknowledgement message including the calculated first hop count, a second initial hop limit field value, and a hop limit value.