Mobile IP network supporting private IP addresses utilizing regional registration and NAT function

It is widely recognized that IP-based mobile network will be a dominant trend and that the address starvation problem and scalable mobility management for mobile nodes are important issues for mobile IP networks. In order to cope with these issues, we propose an approach to realize mobile IP network supporting private addresses for mobile nodes. Our approach introduces regional registration of mobile nodes (Hierarchical Mobile IPv4) and coordinates NAT and DNS functions with the mobile IP protocol. It enables a mobile node to be assigned a global address temporally in a visited network and to accept a call initiated by a correspondent node connected to the global IP network. This paper describes the detailed design of our approach.