On interaction between MAC and transport layers for media streaming in 802.11 Ad-hoc networks

Kitae Nahm; Ahmed Helmy; C.-C. Jay Kuo

doi:10.1117/12.572064

25 October 2004 On interaction between MAC and transport layers for media streaming in 802.11 ad hoc networks

Kitae Nahm, Ahmed Helmy, C.-C. Jay Kuo

Proceedings Volume 5600, Multimedia Systems and Applications VII; (2004) https://doi.org/10.1117/12.572064
Event: Optics East, 2004, Philadelphia, Pennsylvania, United States

Abstract

We examine the validity of TCP-friendliness and the utility of equation-based congestion control as a mean for the media streaming service in 802.11 multi-hop networks. Our investigation is motivated by the recent findings of the bandwidth-delay product of 802.11 multi-hop networks via intensive computer simulations. We show that TCP behavior in 802.11 multi-hop networks is generally inefficient and unstable because the standard TCP is too aggressive considering the low bandwidth-delay product of 802.11 networks. We introduce the concept of the `fractional window' mechanism (which resembles the stop-and-go protocol) for TCP, and show that the modified TCP is more stable and efficient while outperforming the legacy TCP in 802.11-based ad hoc networks. Finally, we show that many of the typical problems of TCP protocol (performance, network fairness, and TCP-friendliness) in 802.11 networks can be solved simply by increasing the bandwidth-delay product of 802.11 networks without any TCP modification. Based on this observation, we conclude that the assumption of the ideal steady-state TCP behavior is generally invalid in 802.11 multi-hop networking environment, and that congestion control based on TCP-friendly equation can hardly provide TCP-fair throughput and smoothness in 802.11 multi-hop networking environment.

Citation Download Citation

Kitae Nahm, Ahmed Helmy, and C.-C. Jay Kuo "On interaction between MAC and transport layers for media streaming in 802.11 ad hoc networks", Proc. SPIE 5600, Multimedia Systems and Applications VII, (25 October 2004); https://doi.org/10.1117/12.572064

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