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TCP Performance Analysis of Packet Buffering in Mobile IP based Networks  

허경 (고려대학교 전자공학과)
노재성 (서일대학 정보통신시스템)
조성준 (한국항공대학교 전자정보통신 컴퓨터공학부)
엄두섭 (고려대학교 전자공학과)
차균현 (고려대학교 전자공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.28, no.5B, 2003 , pp. 475-488 More about this Journal
Abstract
To prevent performance degradation of TCP due to packet losses in the smooth handoff by the route optimization extension of Mobile IP protocol, a buffering of packets at a base station is needed. A buffering of packets at a base station recovers those packets dropped during handoff by forwarding buffered packets at the old base station to the mobile user. But, when the mobile user moves to a congested base station in a new foreign subnetwork, those buffered packets forwarded by the old base station are dropped and TCP transmission performance of a mobile user in the congested base station degrades due to increased congestion by those forwarded burst packets. In this paper, considering the general case that a mobile user moves to a congested base station, we analyze the influence of packet buffering on TCP performance according to handoff arrival distribution for Drop-tail and RED (Random Early Detection) buffer management schemes. Simulation results show that RED scheme can reduce the congestion increased by those forwarded burst packets comparing Drop-Tail, but RED scheme cannot avoid Global Synchronization due to forwarded burst packets by the old base station and new buffer management scheme to avoid it is needed in Mobile IP based networks.
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