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近年来,随着无线传感技术的快速发展和人们对医疗服务需求的增加,人体局域网(BAN)逐渐成为国内外研究的热点。在人体局域网中,各种体征信号采集节点要求植入体内或置于体表,并长时间对人的体征信号进行采集,这需要节点有足够长的生命周期。因此人体局域网节能机制研究是人体局域网研究中的重点之一。人体局域网MAC层决定着无线信道的使用,因此对MAC层协议的研究与优化是功耗控制的重点。本文系统地介绍了MAC层节能机制的原理,重点研究了通过降低数据包冲突降低功耗的方法,提出了一种基于预约机制的MAC协议,在IEEE 802.15.6标准基础上,新定义了预约类型帧,调整了超帧结构。仿真结果证明在节点数目较多或数据量较大的情况下,能有效避免数据包冲突,节能效果明显。
In recent years, with the rapid development of wireless sensor technology and the increasing demand for medical services, human local area network (BAN) has become a hot research field at home and abroad. In the human body local area network, a variety of signs signal acquisition node implants in the body or placed in the body surface, and for a long time on the human sign signal acquisition, which requires nodes have a long enough life cycle. Therefore, the research on energy saving mechanism of human local area network is one of the focuses in the study of human local area network. The human body area network MAC layer decides the use of wireless channel, so research and optimization of MAC layer agreement are the key point of power consumption control. This paper systematically introduces the principle of MAC layer energy-saving mechanism, focuses on reducing the power consumption by reducing data packet collision, and proposes a MAC protocol based on reservation mechanism. Based on the IEEE 802.15.6 standard, a new definition of a reservation Type frame, adjusted superframe structure. Simulation results show that in the case of a large number of nodes or a large amount of data, data packet conflicts can be effectively avoided and the energy saving effect is obvious.