Mobile Ad Hoc Network is a kind of wireless communication network, which is set up by the mobile hosts with no fixed wired infrastructure and dynamic topology. It has increasingly become a very active research field, because it can be widely used in such as: the wedding dresses 2nd military, disaster rescue and so on.At MAC layer, the IEEE802.11 MAC protocol is in fact the current standards for mobile Ad Hoc networks. Because it is designed for single-hop WLAN and has not been optimized for the multi-hop networks, there are many questions when the current IEEE 802.11 cheap nike shoes MAC is used in the multi-hop networks. Especially: 802.11 MAC protocol uses an unfair BEB (Binary Exponential back-off) algorithm to carry out the process of random back-off, and this causes cheap womens nike shoes significant unfairness problems between different nodes. In networks the hidden terminal and exposed terminal problem, as well as the unfair random back-off algorithm make the networks which chi straightener uses 802.11 MAC protocol has capture problems. That is, some nodes comer the shared channel, while the other nodes are in a state of "starvation".This article analyses and studies the BEB back-off algorithm of 802.11 MAC protocol and some other back-off algorithms. On back-off algorithms, many innovative lace wedding dresses algorithms have been proposed, but some of them only improve one aspect, other aspects are decreased, and some of them are hard to be carried out. For the characteristics of wireless Ad Hoc networks, many aspects are manual constraints. So, proposing a simple algorithm achieving a good compromise between all aspects is hard, and it's one of the research focuses. Based on these, we propose an adaptive competition window back-off algorithm. We compare the stability, fairness and network throughput of these two algorithms with TCP flows using NS2 simulation system. Simulation results show that: our algorithm has obvious effects on improving stability, fairness and reducing the average access delay. And at the same time, it doesn't cause the throughput decreasing obviously, and achieve a good compromise among space reuse、static and fair.
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