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Improving TCP Performance for Downward Vertical Handover  

Kim, Ho-Jin (연세대학교 컴퓨터과학과 무선네트워킹연구실)
Lee, Su-Kyoung (연세대학교 컴퓨터과학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.32, no.10B, 2007 , pp. 638-643 More about this Journal
Abstract
Interconnecting wireless local area networks (WLANs) with third generation (3G) cellular networks has become an issue of great interest. However, a Vertical Handover (VHO) causes an abrupt change in link bandwidth. Due to such a change, TCP triggers unnecessary fast retransmission during a Downward VHO (DVHO) from a cellular network to a WLAN, causing throughput degradation. Thus, we propose a new reordering mechanism for DVHO that suppresses unnecessary retransmission due to the spurious duplicate acknowledgments. We analytically investigate the throughput of TCP in the literature and our proposed scheme. Through the numerical and simulation results, it is shown that our proposed TCP achieves better performance in terms of throughput, compared with Nodupack with SACK.
Keywords
TCP; Reordering; Downward Vertical Handover; False Fast Retransmission;
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