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An Evaluation of Media-Oriented Rate Selection Algorithm for Multimedia Transmission in MANETs

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Author(s): Manshaei Mohammad Hossein | Turletti Thierry | Guionnet Thomas

Journal: EURASIP Journal on Wireless Communications and Networking
ISSN 1687-1472

Volume: 2005;
Issue: 5;
Start page: 375340;
Date: 2005;
Original page

Keywords: ad hoc networks | cross-layer optimization | IEEE 802.11 wireless LAN | MANETs | mode selection algorithms

ABSTRACT
We focus on the optimization of real-time multimedia transmission over 802.11-based ad hoc networks. In particular, we propose a simple and efficient cross-layer mechanism that considers both the channel conditions and characteristics of the media for dynamically selecting the transmission mode. This mechanism called media-oriented rate selection algorithm (MORSA) targets loss-tolerant applications such as VoD that do not require full reliable transmission. We provide an evaluation of this mechanism for MANETs using simulations with NS and analyze the video quality obtained with a fine-grain scalable video encoder based on a motion-compensated spatiotemporal wavelet transform. Our results show that MORSA achieves up to 4 Mbps increase in throughput and that the routing overhead decreases significantly. Transmission of a sample video flow over an 802.11a wireless channel has been evaluated with MORSA. Important improvement is observed in throughput, latency, and jitter while keeping a good level of video quality.
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