An Efficient TCP Mechanism to Reduce Out-of-Sequence Packets in Mobile IPv6

The handover latency may cause packet loss as well as packet disruption in standard Mobile IPv6. To mitigate such effects, fast handover for Mobile IPv6 has been developed. Fast Mobile IPv6 can reduce a packet loss using tunnel based handover mechanism which relies on L2 triggers such as transmitting a packet from a previous access router (PAR) to a new access router (NAR). However, this mechanism may result in decreasing the performance of TCP due to the out-of-sequence packets between the tunneling packet from home agent (HA), PAR and directly transmitted packet from correspondent node (CN). In this paper, we propose a new scheme to prevent packet reordering problem using modified snoop protocol. This new scheme can prevent a sequence reordering of data packet and improve the performance of TCP. Simulation results demonstrate that managing the packet sequence in our proposed scheme greatly increases the overall TCP performance in Mobile IPv6 network