Energy optimized beacon transmission rate in a wireless sensor network
Energy optimized beacon transmission rate in a wireless sensor network
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DOI：
10.1109/pimrc.2005.1651645
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发表时间：
2005-09
期刊：
影响因子：
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通讯作者：
M. Kohvakka;Marko Hännikäinen;T. Hämäläinen
中科院分区：
文献类型：
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作者：
M. Kohvakka;Marko Hännikäinen;T. Hämäläinen
资源受限的无线传感器网络（WSN）需要一种节能的介质访问控制（MAC）协议，以最大限度地减少无线电活动时间（占空比）。时隙MAC方案通过将时间划分为连续的数据交换和睡眠时间来提供最低的占空比。数据交换和网络维护的同步是通过交换信标实现的。为了检测网络拓扑结构的变化，节点会周期性地进行扫描，扫描期间节点会接收到来自邻居的信标。这是一种能量消耗，所消耗的能量相当于传输数千个数据包。本文表明，能量消耗主要取决于信标传输速率，最优速率是网络扫描间隔、信标传输能量和无线电接收功率三个参数的函数。通过功率分析和能量模型推导了TUTWSN原型机的最佳信标传输速率。根据分析，优化后的网络平均能耗降低了一个数量级。对于原型，当网络扫描间隔2分钟时，最佳信标传输速率为3.7 Hz
Resource constrained wireless sensor networks (WSN) require an energy efficient medium access control (MAC) protocol that minimizes the radio active time (duty cycle). Time slotted MAC schemes provide lowest duty cycles by dividing time into consecutive data exchange and sleep periods. Synchronization for data exchange and network maintenance is achieved by exchanging beacons. For detecting changes in network topology, nodes periodically perform scanning during which beacons are received from neighbors. This is energy consuming, and the energy required equals to the transmission of thousands of packets. This paper shows that the energy consumption is mainly depending on the beacon transmission rate, and that an optimal rate is a function of three parameters: a network scanning interval, beacon transmission energy, and radio reception power. The optimal beacon transmission rate is derived for a TUTWSN prototype by power analysis and energy models. According to the analysis, the optimization decreases the average network energy consumption up to an order of magnitude. For the prototype, the optimal beacon transmission rate is 3.7 Hz, when network scanning is performed with 2 minutes intervals