The Design of Mobile Router supporting Heterogeneous Access Networks and IPv4 traversal

The roaming (or handover) between heterogeneous networks is an emerging issue of the most recent communication environment. The wide deployment of wireless networks like WLAN, CDMA or WiMax accelerates growth of chance requiring roaming across heterogeneous wireless networks. As a solution of mobility management across heterogeneous networks the MIP6 (mobile IPv6) is used generally and NEMO (network mobility), an extension of the MIP6, is used for network mobility management. In this paper we design a mobile router supporting network mobility and handover between heterogeneous networks. Since The NEMO specification supports only IPv6, the NEMO itself is not enough to be deployed in current Internet environment without the consideration of IPv4 traversal. Thus, we add a feature allowing the mobile router to roam over both IPv6 and IPv4 networks.