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Improving TCP Performance by Implicit Priority Packet Forwarding in Mobile IP based Networks with Packet Buffering  

허경 (고려대학교 전자공학과)
이승법 (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. 500-511 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 the wireless link utilization performance degrades due to increased congestion by those forwarded packets. In this paper, considering the case that a mobile user moves to a congested base station in a new foreign subnetwork, we propose an Implicit Priority Packet Forwarding to improve TCP performance in mobile networks. In the proposed scheme, the old base station marks a buffered packet as a priority packet during handoff. In addition, RED (Random Early Detection) at the new congested base station does not include priority packets in queue size and does not drop those packets randomly based on average queue size. Simulation results show that wireless link utilization performance of mobile hosts can be improved without modification to Mobile IP protocol by applying proposed Implicit Priority Packet Forwarding.
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Times Cited By KSCI : 1  (Citation Analysis)
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