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TCP Performance Study in Vertical Handoff across Heterogeneous Wireless Networks  

Pack Sangheon (서울대학교 전기컴퓨터공학부)
Choi Yanghee (서울대학교 전기컴퓨터공학부)
Publication Information
Journal of KIISE:Information Networking / v.32, no.1, 2005 , pp. 20-28 More about this Journal
Abstract
TCP(Transmission Control Protocol) is one of the most important Internet protocols, which is widely used in wireless networks as well as wired networks. However, when TCP is deployed for wireless networks, it takes severe performance degradation because TCP was designed for wired network. To overcome this drawback, a number of TCP variants have been proposed in the literature. However, most previous schemes did not consider TCP enhancement over heterogeneous networks. In heterogeneous networks, an mobile node (MN) may move from one access network to another(i.e., vertical handover). In the case of vertical handover, an MN experiences a TCP performance degradation caused by the packet loss and the sudden change of link characteristics between two different access networks. In this work, we investigate the TCP performance degradation occurred in vortical handover across heterogeneous networks. First, we have conducted the measurement study over GPRS-WLAN testbed. In the measurement study. we observed the TCP performance degradation in the case of handover from WLAN to GPRS. In order to study more different TCP behaviors during vertical handover, we performed comprehensive simulations using a network simulator 2(ns-2). Based on measurement and simulation results, we investigated how to improve TCP performance in vertical handover and we concluded that the existing mechanisms cannot be perfect solutions and new mechanisms are strongly required.
Keywords
TCP; Performance analysis; Vortical handoff; Heterogeneous wireless networks; Simulation;
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