Optimized Path Registration with Prefix Delegation in Nested Mobile Networks

As the need for a solution to support mobile network is consistently increasing, NEtwork MObility (NEMO) Basic Support protocol is proposed by using a bi-directional tunnel between a Mobile Router (MR) and its Home Agent (HA). However, the multiple levels of MR-HA tunnels in nested mobile networks lead to significant suboptimal routing, called pinball routing. In this paper we propose a Route Optimization (RO) scheme based on improved Prefix Delegation in order to pass ingress filtering. In an effort to provide the RO based on the improved procedure, it performs an address translation mechanism and a registration procedure to inform other nodes of an optimal path. The proposed scheme supports nested mobile networks without requiring additional tunneling, thus reducing packet overhead and latency with regard to the NEMO basic solution. We evaluate the proposed scheme with previous schemes by analytical models. According to the results, our newly proposed scheme shows 20% and 50% of performance improvements for the worst case and the best case, respectively.