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Study on QoS of Multimedia Traffics in MAC Layer Based on 802.11

With the development of wireless networks, the requirements on multimedia traffics, such as data, audio and video are more and more intensive. However, it is a difficult question to guarantee the Quality of Service (QOS) in the system. Based on the 802.11b/g multimedia communication system, this article brings forward 802.11UEDCF extensible protocol by analyzing the principles of 802.11DCF and 802.11EDCF MAC protocol. Proven by simulation, it can be seen clearly that QOS of audio and video is promoted by 802.11EDCF comparing to 802.11DCF. Furthermore, 802.11UEDCF which is proposed by this paper can further guarantee the QOS of video and audio requiring higher real time comparing to 802.11EDCF.