School of Information and Communication Engineering, Sungkyunkwan University, Suwon 440-774, Korea.
Sensors (Basel). 2011;11(3):2875-84. doi: 10.3390/s110302875. Epub 2011 Mar 3.
Wireless sensor networks require energy-efficient data transmission because the sensor nodes have limited power. A cluster-based routing method is more energy-efficient than a flat routing method as it can only send specific data for user requirements and aggregate similar data by dividing a network into a local cluster. However, previous clustering algorithms have some problems in that the transmission radius of sensor nodes is not realistic and multi-hop based communication is not used both inside and outside local clusters. As energy consumption based on clustering is dependent on the number of clusters, we need to know how many clusters are best. Thus, we propose an optimal number of cluster-heads based on multi-hop routing in wireless sensor networks. We observe that a local cluster made by a cluster-head influences the energy consumption of sensor nodes. We determined an equation for the number of packets to send and relay, and calculated the energy consumption of sensor networks using it. Through the process of calculating the energy consumption, we can obtain the optimal number of cluster-heads in wireless sensor networks.
无线传感器网络需要节能的数据传输，因为传感器节点的功率有限。基于簇的路由方法比平面路由方法更节能，因为它只能根据用户要求发送特定的数据，并通过将网络划分为本地簇来聚合相似的数据。然而，以前的聚类算法存在一些问题，即传感器节点的传输半径不切实际，并且在本地簇内外都不使用多跳通信。由于基于聚类的能量消耗取决于簇的数量，我们需要知道最佳的簇数量。因此，我们提出了一种基于无线传感器网络中多跳路由的最佳簇头数。我们观察到，簇头形成的本地簇会影响传感器节点的能量消耗。我们确定了一个用于发送和中继数据包数量的方程，并使用它计算了传感器网络的能量消耗。通过计算能量消耗的过程，我们可以获得无线传感器网络中的最佳簇头数。
