无线物联网连接：许多选择，许多权衡

　　无线物联网连接：许多选择，许多权衡

　　物联网（物联网）得到了很多值得关注的，因为它提供了许多潜在的好处。虽然安装在五，十，或更多年的物联网连接节点的数量是许多投机和市场研究的主题（以及大量的猜测，以及），有一件事是明确的：数字将是巨大的。物联网是密切相关的工业兄弟机到机（M2M）的应用程序，所以有许多技术的相似性和实现重叠的两个类别之间。

　　从高层次的角度来看，安iot consists of三节点系统功能块（图1）：（1）温度传感器，或transducer门开/关闭位置流，as the examples）；2）数字处理器单元（microcontroller）captures the which does the处理和传感器数据和分析港口；和3）which can be the连通，有线或无线。is an option the前if there is an可用低成本的网络或一个“if is installed，安全是关键consideration if the setting，EMI / RFI是严格区分，or if only一些它是连通的。不管一个人多，设施iot for most is the preferred，无线链路选择装置和两个学院的整体灵活性和轻松安置和在初始relocating甚至if needed the iot节点。

　　Figure 1： The high-level system block diagram of an IoT or M2M node shows the three primary functions： sensor， processor， and connectivity interface.

　　Choosing a standard wireless link does not mean that the design decisions are done and the design process is trivial. Wireless links must adhere to industry and regulatory standards， and regional approval in many cases. There are many wireless IoT options which designers may have to consider. In some installations， the decision is already made due to a mandate or existing network. In others， the designer can evaluate the options and make a choice based on the trade-offs and priorities of performance， network type （mesh， WLAN， point-to-point）， range， power， frequency band（s）， robustness and， of course， cost. There are also major issues of security， authentication， and encryption.