物联网的愿景之一是能够测量以前从未测量过的变量。无论应用是监视基础设施老化(例如桥梁、隧道或电力传输线的老化),还是实时提供停车及交通信息,都需要无线传感器网络(WSN)提供与有线网络类似的性能,而且适合实际部署。传感器网络要能够扩展至包含大量无线节点,而且在很多情况下,需要跨越很长的距离。 One of the vision of the Internet of Things is the ability to measure variables that have never been measured before. Whether applications monitor aging of the infrastructure, such as aging of bridges, tunnels, or power transmission lines, or provide parking and traffic information in real time, wireless sensor networks (WSNs) are required to provide similar performance to wired networks and fit for physical deployment. Sensor networks need to be scalable to include a large number of wireless nodes, and in many cases need to span long distances.