提出了一种适合VoWLAN技术DEDCA接入机制,引入了信道状态CS因子,提出了基于信道状态的动态的退避窗口机制和一种新的退避方式。确立了退避窗户最大值和最小值的与信道关系的公式,确立了退避方式阀值的公式,最后通过进行了仿真,DEDCA不但对视频和音频有QoS保证,整个信道的性能都提高了,验证了DEDCA的正确性和适合在VoWLAN技术中的应用。 A DEDCA access mechanism suitable for VoWLAN technology is proposed. The channel state CS factor is introduced. A dynamic backoff window mechanism based on channel state and a new way of backoff are proposed. Established the relation between the maximum and the minimum of the window and the channel, established the formula of the threshold of the evasion mode, and finally, through the simulation, DEDCA not only guarantees the QoS of video and audio, but also improves the performance of the whole channel. The correctness of DEDCA and its application in VoWLAN technology.