Preventing Out-of-Sequence Packets on the Route Optimization Procedure in Proxy Mobile IPv6

Proxy mobile IPv6 is one of network-based mobility support protocols which does not require a mobile host to be involved in mobility support signaling. Even though proxy mobile IPv6 has many advantages than client-based mobility support protocols such as mobile IPv6, unfortunately, it may cause an out-of-sequence problem during its route optimization procedure. Thus, in this paper, we develop an estimation function for an out- of-sequence time period and reveal the out-of-sequence problem caused by the route optimization procedure. Then we propose a scheme which minimizes the arrival of out-of-sequence packets to the mobile host and analyze the impact of out-of-sequence packets. The performance evaluation results demonstrate that the traffic rate and out-of-sequence time period mainly have an effect on the out-of-sequence problem.