Smart TCP Approach to Handle Seamless Vertical Handoff
Mohammad A. Huq Dept. of Computer Science and Engineering, Primeasia University, Dhaka, Bangladesh ariful.huq@primeasia.edu.bd
Keywords:
Vertical Handoff, Freeze, TCP; bandwidth probingAbstract
The coexistence of 3G cellular networks with wireless local area networks (WLAN) has been a topic of great interest to the experts in recent years. Heterogeneous networks can complement each other in terms of data rate and coverage area. WLAN provides a high bandwidth data service over a small area while the 3G cellular network provides a higher mobility with lower bandwidth data service. When a mobile node switches between networks, vertical handoff (VHO) that ensures an uninterrupted data service becomes important. During VHO the conventional TCP scheme suffers packet reordering and premature timeout which causes severe throughput degradation. In this paper we propose a Sender based Freeze-TCP (SFTCP) scheme for seamless vertical handoff. SFTCP stops transmitting packets before the disconnection occurs in a way inspired by Freeze-TCP, then it probes link bandwidth after the reconnection to enable the full use of the newly available bandwidth. Instead of using conventional mechanism of freezing we propose a new technique where the mobile sender controls the freezing behavior. Through this approach we can have an immediate recovery upon reconnection as well as a significantly improved window adjustment to the newly available network conditions. Simulation results show that our proposed scheme can achieve faster recovery and improved throughput.
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