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中文摘要：
无线媒体访问控制（MAC）协议通常使用分布式竞争机制来共享无线信道,但在动态和开放的网络环境中,部分违规节点会有意识地抢占信道以获取更多的信道资源.为此,通过对IEEE 802.11协议的DCF机制进行修改,提出一种改进的退避算法,可实现对网络中违规行为节点的有效检测,并通过惩罚机制加以纠正.仿真结果表明,该方法能够更有效地检测出无线网络中的违规行为,提高整个网络的吞吐量.
英文摘要：
Wireless medium access control （MAC） usually uses distributed contention resolution mechanisms for sharing the wireless channel. However, in an open and dynamic wireless network, to obtain more bandwidth resources, some nodes may preempt channel resource. Modifications to the distributed coordination function （DCF） mechanism of IEEE 802. 11 protocol are presented, and an improved algorithm to implement the detection of misbehavior is proposed. The penalty measures are taken further to correct the misbehavior. Simulation results show that the ratio of correctly detecting the misbehavior is improved and the throughput of the whole networks is increased by using the proposed mechanism.
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