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DOI:
Journal of Software:2009.20(7):1895-1908

面向多跳无线网络的无冲突MAC协议
张克旺,张德运,杜君
(西安交通大学 电子与信息学院,陕西 西安 710049; 西北工业大学 计算机学院,陕西 西安 710072)
Collision Free MAC Protocol for Multi-Hop Wireless Networks
ZHANG Ke-Wang,ZHANG De-Yun,DU Jun
()
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Received:February 27, 2008    Revised:June 11, 2008
> 中文摘要: 多跳无线网络中隐藏节点导致节点之间的冲突频繁、数据重传率高、网络吞吐量下降.而802.11 DCF 中 的RTS/CTS(ready-to-send/clear-to-send)机制不能有效地防止隐藏节点,特别是随着网络中节点通信速率的提高,由于节点的信噪比要求也相应提高,接收节点受到更大范围内隐藏节点的干涉,RTS/CTS 机制防止隐藏节点的效率急 剧降低.首先,在考虑网络积累干涉以及环境噪音的情况下分析了多跳无线网络中的隐藏节点问题.然后,提出一种 双信道无冲突MAC(media access control)协议DCCFMA(double channel collision free media access).DCCFMA 协议采用双信道结构,接收节点根据数据信道中发送节点的信号强度动态调节控制信道的发射功率,以完全覆盖接收节 点周围所有的隐藏节点,保证接收节点在接收过程中不受干涉.DCCFMA 协议能够有效地解决多跳无线网络中的隐藏节点问题.仿真结果表明,与802.11DCF 相比,DCCFMA 机制下的平均网络吞吐量增加了24%.
Abstract:Collision rate increases significantly with the appearance of hidden nodes in multi-hop wireless network, which results in unsuccessful transmissions and leads to performance degradation of the network. The RTS/CTS handshakes of 802.11DCF can not eliminate hidden nodes, and the situation becomes worse when the nodes are equipped with higher speed wireless devices, which require higher signal to interference and noise ratio (SINR) for successful reception. This paper analyzes the prevalence of hidden nodes in multi-hop wireless network and proposes an MAC protocol named double channel collision free media access protocol—DCCFMA to solve the hidden nodes problem. DCCFMA is a dual channel MAC (media access control) protocol, receiver adjusts the transmitting power of the control channel according to the signal power received from the transmitter so as to cover all hidden nodes around the receiver. Simulation results show that DCCFMA solves hidden nodes problem better than RTS/CTS (ready-to-send/clear-to-send) handshakes and achieves 24% additional network throughput as compared to that of 802.11 DCF.
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基金项目:Supported by the National High-Tech Research and Development Plan of China under Grant No.2005AA121130 (国家高技术研究发展计划(863)) Supported by the National High-Tech Research and Development Plan of China under Grant No.2005AA121130 (国家高技术研究发展计划(863))
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张克旺,张德运,杜君.面向多跳无线网络的无冲突MAC协议.软件学报,2009,20(7):1895-1908

ZHANG Ke-Wang,ZHANG De-Yun,DU Jun.Collision Free MAC Protocol for Multi-Hop Wireless Networks.Journal of Software,2009,20(7):1895-1908