LoRa for the Internet of Things
LoRa for the Internet of Things
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发表时间：
2016-02
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通讯作者：
Martin C. Bor;J. Vidler;U. Roedig
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作者：
Martin C. Bor;J. Vidler;U. Roedig
新的收发器技术已经出现，其使得能够在非常长的距离上进行功率有效的通信。这种低功耗广域网（LPWAN）技术的示例是LoRa、Sigfox和Weightless。这些技术的典型应用场景是城市范围的仪表阅读收集，其中设备以非常低的频率通过长距离将读数发送到数据集中器（单跳网络）。我们认为，这些收发器是潜在的非常有用的构建更通用的物联网（IoT）网络，结合多跳双向通信，使传感和驱动。此外，这些收发器具有用于物联网网络的更传统收发器所不具备的有趣功能，这些功能可以构建新的协议元素。在本文中，我们提出了一个目前可用的LoRa收发器的性能和能力分析。我们描述了它的功能，然后演示如何将这样的收发器可以有效地使用在广域应用场景。特别是，我们展示了如何独特的功能，如并发的非破坏性传输和载波检测可以采用。我们的部署实验表明，6个LoRa节点可以形成一个覆盖1.5公顷的网络，在2节AA电池上实现2年的潜在寿命，并在5秒内提供数据，可靠性为80%。
New transceiver technologies have emerged which enable power efficient communication over very long distances. Examples of such Low-Power Wide-Area Network (LPWAN) technologies are LoRa, Sigfox and Weightless. A typical application scenario for these technologies is city wide meter reading collection where devices send readings at very low frequency over a long distance to a data concentrator (one-hop networks). We argue that these transceivers are potentially very useful to construct more generic Internet of Things (IoT) networks incorporating multi-hop bidirectional communication enabling sensing and actuation. Furthermore, these transceivers have interesting features not available with more traditional transceivers used for IoT networks which enable construction of novel protocol elements. In this paper we present a performance and capability analysis of a currently available LoRa transceiver. We describe its features and then demonstrate how such transceiver can be put to use efficiently in a wide-area application scenario. In particular we demonstrate how unique features such as concurrent non-destructive transmissions and carrier detection can be employed. Our deployment experiment demonstrates that 6 LoRa nodes can form a network covering 1.5 ha in a built up environment, achieving a potential lifetime of 2 year on 2 AA batteries and delivering data within 5 s and reliability of 80%.