Improving the QoS in IEEE 802.11e Based on the Method of Virtual Heap Tree

The way in which IEEE 802.11 DCF uses the random back-of scheme to resolve the channel contention leads to inefficient utilization of the channel bandwidth resource, especially in a highly loaded network. The portion of channel bandwidth wasted in collision state is significantly high. In this paper, The VHT (Virtual Heap Tree)-CSMA architecture has been proposed to cope with 802.11e wireless network communication environment. It is based on a forcing collision resolution mechanism, which is able to prioritize RT (real time)-traffic over timing unconstrained traffic. That is, instead of controlling all traffic generated by any nodes, the proposed method will only control the traffic generated by real time nodes.