Micromobility using multicast

摘要

The invention is a method and apparatus for registering a mobile node in both home and in foreign domains. A base station informs a base station router of the presence of a mobile entering the base station's coverage area by sending a mobile node advertisement message to a base station router. In addition, the mobile node sends a mobile IP registration request to the base station router. The base station router appends a base station router extension message to the mobile IP registration request (which contains an IP address of the base station router) and forwards the mobile IP registration request to a main access router. The main access router appends a multicast address extension to the mobile IP registration reply. The multicast address extension contains the multicast address allocated for the mobile node.