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Congestion Control Algorithm for TCP Performance Enhancement by Bandwidth Measurement in Vertical Handoffs between Heterogeneous Wireless Networks  

Hwang An-Kyu (Department of Information and Communications Engineering, Chungnam National University)
Lee Jae-Yong (Division of Electrical and Computer Engineering, Chungnam National University)
Jung Whoi-Jin (Department of Information and Communications Engineering, Chungnam National University)
Kim Byung-Chul (Division of Electrical and Computer Engineering, Chungnam National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.43, no.8, 2006 , pp. 84-90 More about this Journal
Abstract
With the widespread of the wireless Internet and wireless LAN, different wireless technologies such as 3G cellular networks and WLAN will cooperate to support more users and applications with higher data rate over wider areas. When a mobile node moves around in the hybrid networks, it needs to perform seamless vertical handoffs between different wireless networks to provide high performance data transmission. When an application with TCP connection in a mobile node performs a vertical handoff, TCP performance is degraded due to packet losses even though it maintains the previous TCP state information during handoff, because 3G and WLAN have different available bandwidth. In this paper, we propose a new congestion control algorithm for vertical handoff to improve the TCP performance by measuring the rough end-to-end available bandwidth and calculating the slow-start threshold. By ns-2 simulation, we show that the proposed algorithm enhances the TCP performance during vertical handoffs compared to the previous algorithms.
Keywords
Wireless LAN; Vertical handoff; TCP performance; BW measurement;
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