Toward Ubiquitous Connectivity via LoRaWAN: An Overview of Signal Collision Resolving Solutions
Toward Ubiquitous Connectivity via LoRaWAN: An Overview of Signal Collision Resolving Solutions
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通过 LoRaWAN 实现无处不在的连接：信号冲突解决方案概述
DOI：
10.1109/iotm.001.2100114
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
and Wonjun Lee
中科院分区：
文献类型：
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作者：
Chenglong Shao;Osamu Muta;Wenjie Wang;and Wonjun Lee
对节能、远程和免许可物联网（IoT）通信网络的需求不断增长，激发了人们对免许可低功率广域网（LPWAN）的极大兴趣。这种革命性的技术代表了无线网络发展的范式转变，因为它可以使低功率（毫瓦）物联网设备能够在长距离（几公里）上以低数据速率（每秒200比特）进行传输，这显然不同于传统的物联网网络技术（例如，Wi-Fi和ZigBee），仅支持短距离通信。具体来说，远程广域网（LoRaWAN）是一种领先的和具有代表性的LPWAN技术，由于其开源软件和安装方便，一直受到学术界和工业界的关注。然而，尽管有这种兴趣，但目前的LoRaWAN还不是一个成熟的通信平台，无法为各种物联网应用提供无处不在的连接。这主要是因为LoRaWAN通常服务于大量共存的终端设备，其中在LoRaWAN的物理层（LoRa）处频繁发生信号冲突，从而导致整体网络容量的严重下降。在这种情况下，本文的目的是全面概述LoRa冲突解决方案的最新物理层解决方案。我们特别研究了由扩频因子网络参数引起的不同类型的LoRa冲突。此外，还讨论了物理层设计解决LoRa冲突的潜在愿景，可能会被考虑用于未来的研究。
The ever increasing demand for energy-efficient, long-range, and license-free Internet of Things (IoT) communication networks has spurred great interest in unlicensed low-power wide area networks (LPWANs). Such a revolutionary technology represents a paradigm shift in the development of wireless networks, as it can enable low-power (milliwatts) IoT devices to transmit at low data rates (kilobits per second) over long distances (several kilometers), which is clearly different from conventional IoT networking technologies (e.g., Wi-Fi and ZigBee) that only support short-range communications. Specifically, long-range WAN (LoRaWAN) is a leading and representative LPWAN technology that has been gathering remarkable attention from both academia and industry because of its open source software and installation ease. Despite this interest, however, current LoRaWAN is not yet a mature communication platform to provide ubiquitous connectivity for a wide variety of IoT applications. This is mainly because LoRaWAN typically serves a large volume of coexisting end devices among which signal collisions frequently occur at the physical layer (LoRa) of LoRaWAN, thereby leading to severe degradation of overall network capacity. In this context, the aim of this article is to provide a comprehensive overview of up-to-date physical-layer solutions for LoRa collision resolution. We particularly investigate different types of LoRa collisions resulting from the spreading factor network parameter. Moreover, the potential visions of physical-layer design to resolve LoRa collisions that might be considered for future research are also discussed.