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An E2E Mobility Management and TCP Flow Control Scheme in Vertical Handover Environments  

Seo Ki-nam (KTF Technologies 연구소)
Lim Jae-Sung (아주대학교 정보통신전문대학원)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.6B, 2005 , pp. 387-395 More about this Journal
Abstract
In this paper, we propose an end-to-end mobility management and TCP flow control scheme which considers different link characteristics for vertical handover environments. The end-to-end mobility management is performed by using SIP protocol. When a mobile node moves to a new network, it informs its movement of the correspondent node by sending SIP INFO message containing a new IP address which will be used in the new network. And then the corresponding node encapsulates all packets with the new IP address and sends them to the mobile node. in general, RTT of WLAN is shorter than RTT of cdma2000. when the MN moves from WLAN network to cdma2000 network, TCP retransmission timeout will be occurred in spite of non congestion situations. Thus, TCP congestion window size will be decreased and TCP throughput will be also decreased. To prevent this phenomenon, we propose a method using probe packets after handover to estimate a link delay of the new network. We also propose a method using bandwidth ratio of each network to update RTT. It is shown through NS-2 simulations that the proposed schemes can have better performance than the previous works.
Keywords
Vertical Handover; Mobility Management; TCP Flow Control; SIP;
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