基于EDCA协议的视频流自适应映射机制

摘要

For the video packets delivery over 802.11e WLAN networks ,an improved cross‐layer mapping (ICLM) scheme was presented .There were four access categories (ACs) in the 802.11e MAC layer according to EDCA protocol .The ICLM scheme mapped the video packets to the ACs according to both the significance of the video packets and the current network conditions . The simulation results show that this scheme can effectively enhance the video quality over WLAN networks .%为提高802.11无线局域网中视频传输的质量，802.11工作组引入增强的分布式信道接入协议，但是这个协议没有充分考虑视频数据的特点。在研究该网络协议的基础上，提出一个改进的跨层自适应映射策略。在传输控制的过程中考虑视频包的重要性和当前的网络状态，能提高802.11网络中视频传输的质量。将该算法仿真结果与其它算法进行比较，比较结果表明，该算法在802.11无线局域网中的视频传输质量优于其它算法。