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Analysis of TCP Performance over Mobile Ad Hoc Networks
Authors:Holland  Gavin  Vaidya  Nitin
Affiliation:(1) Department of Computer Science, Texas A&M University, College Station, TX 77843-3112, USA;(2) Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
Abstract:Mobile ad hoc networks have attracted attention lately as a means of providing continuous network connectivity to mobile computing devices regardless of physical location. Recent research has focused primarily on the routing protocols needed in such an environment. In this paper, we investigate the effects that link breakage due to mobility has on TCP performance. Through simulation, we show that TCP throughput drops significantly when nodes move, due to TCP's inability to recognize the difference between link failure and congestion. We also analyze specific examples, such as a situation where throughput is zero for a particular connection. We introduce a new metric, expected throughput, for the comparison of throughput in multi-hop networks, and then use this metric to show how the use of explicit link failure notification (ELFN) techniques can significantly improve TCP performance.
Keywords:mobile ad hoc networks  wireless networks  transport protocols  performance evaluation  explicit feedback  TCP
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