Low Delay Marking for TCP in Wireless Ad Hoc Networks

Low Delay Marking for TCP in Wireless Ad Hoc Networks


Choong-Soo Lee, Mingzhe Li, Emmanuel Agu, Mark Claypool, and Robert Kinicki

In Proceedings of IEEE Workshop on Multihop Wireless Networks
Phoenix, Arizona, USA
April 2004


End-hosts on wireless ad hoc networks typically use TCP as their transport layer protocol. Being designed for wired networks, TCP can perform poorly over wireless networks. Research that has proposed ways to improve TCP performance over wireless networks has concentrated primarily on improving TCP throughput. However, emerging applications, such as interactive multimedia and network games, require reduced delay at least as much as increased throughput. This paper presents LDM (Low Delay Marking), an IP layer queue marking mechanism that uses estimates of the number of hops and flows at each wireless node to approximate the optimal marking probability. Analysis of NS-2 simulation results indicates that LDM greatly reduces the round-trip time of TCP connections while improving throughput under many configurations.


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See also:

  • Mingzhe Li, Choong-Soo Lee, Emmanuel Agu, Mark Claypool, and Robert Kinicki. Performance Enhancement of TFRC in Wireless Ad Hoc Networks, In Proceedings of the 10th International Conference on Distributed Multimedia Systems (DMS), San Francisco, California, September 2004. Online at: http://www.cs.wpi.edu/~claypool/papers/re-tfrc/