An Evaluation of Media-Oriented Rate Selection Algorithm for Multimedia Transmission in MANETs
An Evaluation of Media-Oriented Rate Selection Algorithm for Multimedia Transmission in MANETs
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MANET 中多媒体传输的面向媒体速率选择算法的评估
DOI：
10.1155/wcn.2005.757
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
N. Goto
中科院分区：
文献类型：
--
作者：
K. Uetsuka;H. Nakayama;N. Goto
我们专注于优化基于802.11的自组织网络上的实时多媒体传输。特别是，我们提出了一种简单有效的跨层机制，该机制考虑了信道条件和媒体特性，以动态选择传输模式。这种被称为面向媒体的速率选择算法（MORSA）的机制针对的是像VoD这样不需要完全可靠传输的容错应用。我们使用NS模拟对该机制进行了评估，并分析了基于运动补偿时空小波变换的细粒度可扩展视频编码器获得的视频质量。我们的结果表明，MORSA实现了高达4 Mbps的吞吐量提高，路由开销显著降低。用MORSA对802.11a无线信道上的视频流传输进行了评估。在保持良好的视频质量水平的同时，在吞吐量、延迟和抖动方面观察到重要的改进。
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.