一种基于EDCA的视频数据包动态映射算法

为了改善无线局域网中视频流的传输性能，该文提出一种基于增强分布式协调接入机制(EDCA)的动态映射算法。该算法首先建立视频数据包重要性排序模型，统计EDCA各个访问类的平均服务率，然后根据其可用资源动态地将排序后的视频数据包映射到不同的访问类中进行传输。该方法改进了EDCA机制中对数据包的静态映射机制，能够充分利用网络资源，从而改善了视频流在无线局域网中的传输性能。实验结果表明，该文提出的方法降低了数据包的传输延迟，提高了重建图像的质量。

An EDCA-based Dynamic Mapping Scheme for Video Streaming Packets

To improve the performance of video transmission over Wireless Local Area Networks (WLAN), a dynamic mapping scheme based on Enhanced Distributed Channel Access (EDCA) is proposed. This scheme builds initially the importance-based sorting model for video data packets and computes statistically the average service rate for each access category of EDCA, and then sends dynamically the sorted video packets into different access category for transmission according to the available resources. Because the proposed scheme that modifies the still mode of packets mapping scheme in EDCA can make full use of the network resources, it improves the transmission performance for video transmission over WLAN. The experiment results show that the proposed scheme can reduces the transmission delay of packets and increases the quality of reconstruction images.