The 802.11e EDCA Network Based on CFB Mode
Jing Wei · Journal of Liaoning University · 2012
IEEE 802.11 DCF is one of WLAN MAC(medium access control) layer protocol which hasn't considered the priority.The IEEE 802.11e EDCA standard introduces different ACs(access categories) and each AC has different priority and channel access parameters.When the CFB(contention free burst) mode for EDCA can be employed,in the entire TXOP time,the access stations can control the connected media traffics which can save some time to compete the channel.However,whether the different priority traffics for their QoS can be guaranteed in above three kinds of MAC layers of network is the problem to be solved in this paper.The access mechanisms of three kinds of MAC layers of network: DCF,EDCA and EDCA + CFB mode are studied,and simulated in the complex topology network,the system performance comparisons under three MAC layers of network are provided.The simulation results reveal that the EDCA + CFB mode can provide multi-priority traffics with QoS support and ensure the system throughput and packet loss rate,delay performance for higher priority traffics.