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Does Bidirectional Traffic Do More Harm Than Good in LoRaWAN Based LPWA Networks?

机译：双向流量在基于LoRaWAN的LPWA网络中带来的危害是否大于危害？

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摘要

The need for low power, long range and low cost connectivity to meet the requirements of IoT applications has led to the emergence of Low Power Wide Area (LPWA) networking technologies. The promise of these technologies to wirelessly connect massive numbers of geographically dispersed devices at a low cost continues to attract a great deal of attention in the academic and commercial communities. Several rollouts are already underway even though the performance of these technologies is yet to be fully understood. In light of these developments, tools to carry out 'what-if analyses' and predeployment studies are needed to understand the implications of choices that are made at design time. While there are several promising technologies in the LPWA space, this paper specifically focuses on the LoRa/LoRaWAN technology. In particular, we present LoRaWANSim, a simulator which extends the LoRaSim tool to add support for the LoRaWAN MAC protocol, which employs bidirectional communication. This is a salient feature not available in any other LoRa simulator. Subsequently, we provide vital insights into the performance of LoRaWAN based networks through extensive simulations. In particular, we show that the achievable network capacity reported in earlier studies is quite optimistic. The introduction of downlink traffic can have a significant impact on the uplink throughput. The number of transmit attempts recommended in the LoRaWAN specification may not always be the best choice. We also highlight the energy consumption versus reliability trade-offs associated with the choice of number of retransmission attempts.
机译：需要低功耗，远程和低成本连接，以满足物联网应用要求导致了低功率广域（LPWA）网络技术的出现。这些技术的承诺以低成本无线连接大量地理上分散的设备，继续吸引学术和商业社区的大量关注。即使这些技术的性能尚未完全理解，已经进行了几种推出已经开始。鉴于这些开发，需要进行“ - 如果分析”和预先部署研究的工具，以了解设计时间所做的选择的含义。虽然LPWA空间有几种有前途的技术，但本文专注于Lora / Lorawan技术。特别是，我们呈现Lorawansim，该模拟器扩展了Lorasim工具，以增加对使用双向通信的LoraWan MAC协议的支持。这是任何其他LORA模拟器中不可用的突出功能。随后，我们通过广泛的模拟提供基于Lorawan网络的表现的重要见解。特别是，我们表明早期研究中可实现的网络能力非常乐观。下行链路流量的引入可能对上行链路吞吐量产生重大影响。 Lorawan规范中推荐的传输尝试的数量可能并不总是是最佳选择。我们还突出了与选择次数相关的可靠性权衡的能源消耗与可靠性相关的能源消耗。

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