Mobility-Aware Drop Precedence Scheme in DiffServ-Enabled Mobile Network Systems

In DiffServ-enabled mobile network systems, TCP sender may time out if packet loss occurs at handover event. Thus, TCP window size may be reduced temporarily due to packet loss. Under overloaded traffic situation in local IP-managed network right after handover, furthermore, the sending rate of TCP packets that a mobile host generates may not be enough to keep its contract service rate on SLA (service level agreement). Therefore, giving temporal priority to the packets in a handover flow can compensate for the reduction of packet sending rate after handover. In this paper, we propose a mobilityaware drop precedence scheme in order to alleviate the performance loss from temporal disconnection or the reduction of sending rate.