Self-adaptively Adjusting the Minimum Contention Windows to Maximizing the Saturated Throughput of IEEE 802.11 DCF
Li Yun①②; Chen Qian-bin①; Long Ke-ping①; Wu Shi-qi②
①Special Research Centre for Optical Internet & Wireless Information Networks, Chongqing University of Posts & Telecommunications, Chongqing 400065, China; ②National Defense Key Lab of Anti-interference Communication Technology,
University of Electronic Science and Technology of China, Chengdu 610054, China
Abstract：It is important to maximize the saturated throughput of 802.11 DCF for fully utilizing wireless bandwidth. The saturated throughput of 802.11 DCF is related to minimum contention windows, maximum backoff stage and the contending nodes in the networks. Based on the analysis to this relationship, this paper induces a simple formula to calculate the optimized minimum contention windows for maximizing the saturated throughput of 802.11 DCF, and gives a self-adaptive contention nodes estimation algorithm, according to which and the simple formula, the optimized minimum contention windows is adapted dynamically. The accuracy of above formula and algorithm is valuated by simulation. The saturated throughput of improved 802.11 DCF and the saturated throughput of 802.11 DCF are compared in this paper. The simulation results prove that the above formula and algorithm are accurate and effective.
2006, Vol. 28 
