  Common Mobile IPv6 mechanisms, Bidirectional tunneling and Route
optimization, show inefficient packet overhead when both nodes are mobile.
Researchers have proposed methods to reduce packet overhead regarding to
maintain compatible with standard mechanisms. In this paper, three mechanisms
in Mobile IPv6 are discussed to show their efficiency and performance.
Following discussion, a new mechanism called Improved Tunneling-based Route
Optimization is proposed and due to performance analysis, it is shown that
proposed mechanism has less overhead comparing to common mechanisms. Analytical
results indicate that Improved Tunneling-based Route Optimization transmits
more payloads due to send packets with less overhead.
