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A Novel Sender-Based TCP Congestion Control for Downward Vertical Handover  

Choi, Yeo-Min ((주) 제이투엠소프트)
Song, Joo-Seok (연세대학교 정보통신연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.6B, 2008 , pp. 430-439 More about this Journal
Abstract
In this paper, we propose a sender-based TCP congestion control scheme for downward vertical handover (DVHO), in which mobile node moves from a cellular network to a wireless LAN. DVHO can give rise to severe performance problems in TCP throughput because it causes a drastic change of link characteristics. Particularly, TCP executes falsely congestion control by packet reordering, which is occurred from link delay difference between a cellular link and a wireless LAN link. Therefore, the congestion window is reduced. And unnecessary retransmissions wastes bandwidth. To solve these problems, we propose a method using estimated round-trip time in cellular link to process duplicated ACKs from reordering. Furthermore, the duplicated ACKs are used to the control congestion window size. Simulation result shows that the proposed scheme can solve problems. Moreover, the proposed scheme can have better performance than TCP New Reno and nodupack.
Keywords
TCP; Vertical handover; Downward vertical handover; Reordering; Congestion control;
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