Ad hoc网络中DCF公平性分析与改进
doi: 10.3724/SP.J.1146.2006.01022
Analyzing and Improving the DCF Fairness in Ad hoc Network
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摘要: 在考虑节点的物理载波检测范围大于通信范围的情况下,该文分析了多跳Adhoc网络中物理载波检测机制对IEEE 802.11DCF协议公平性的影响。针对载波干扰给IEEE802.11DCF协议带来的严重不公平问题,提出了一种基于冲突和干扰感知的退避(CIAB)算法。仿真证明,该算法能有效地改善IEEE802.11DCF协议的公平性,并且没有引起网络吞吐量的严重下降。Abstract: In this paper, the impact of physical carrier-sense mechanism on the fairness of the IEEE 802.11DCF MAC protocol in multi-hop Ad hoc networks is investigated, considering that physical carrier-sense range is much lager than communication range. This paper discovers that the IEEE 802.11 DCF MAC protocol may suffers from a great fairness problem because of the carrier interference. To solve this problem, a Collisions and Interferences Aware Backoff (CIAB) algorithm is then proposed. Simulation results show that this algorithm can greatly improve the fairness of the IEEE 802.11 DCF MAC protocol without significantly impairing aggregate throughput in Ad hoc networks.
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