| Summary: | 碩士 === 國立成功大學 === 電腦與通信工程研究所 === 98 === This thesis is mainly proposing a protection mechanism for video streaming over IEEE 802.11e wireless network. In the proposed Cross-Layer Mapping Unequal Error Protection (CLM-UEP) mechanism, the lost packets caused by wireless transmission are against by employing Unequal Error Protection (UEP) which gives differential level of transmission protection based on the significance of video coding. Moreover, our proposing CLM-UEP adopts an adaptive Cross-Layer Mapping algorithm to effectively utilizes queue space and reduce the network congestion. According to hierarchical video coding features, the CLM-UEP scheme generates differential amounts of redundant packets to different video frame types in the Application Layer. After that, in the Media Access Control layer, the video and redundant packets are mapped to proper AC queues with a dynamic mapping method based on video coding significance and network load to achieve the higher transmission priority to the more important video and redundant packets. The numerical results show that our proposed CLM-UEP mechanism improves the video transmission quality over IEEE 802.11e network by reducing the wireless transmission loss with UEP, but also avoiding network congestion with adaptive queue mapping.
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