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首页> 外文会议>IEEE International Conference on Distributed Computing Systems >Contact-Aware Opportunistic Data Forwarding in Disconnected LoRaWAN Mobile Networks
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Contact-Aware Opportunistic Data Forwarding in Disconnected LoRaWAN Mobile Networks

机译：断开连接的Lorawan移动网络中的联系机会机会数据转发

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LoRaWAN is one of the leading Low Power Wide Area Network (LPWAN) architectures. It was originally designed for systems consisting of static sensor or Internet of Things (IoT) devices and static gateways. It was recently updated to introduce new features such as nano-second timestamps which open up applications to enable LoRaWAN to be adopted for mobile device tracking and localisation. In such mobile scenarios, devices could temporarily lose communication with the gateways because of interference from obstacles or deep fading, causing throughput reduction and delays in data transmission. To overcome this problem, we propose a new data forwarding scheme. Instead of holding the data until the next contact with gateways, devices can forward their data to nearby devices that have a higher probability of being in contact with gateways. We propose a new network metric called Real-Time Contact-Aware Expected Transmission Count (RCA-ETX) to model this contact probability in real-time. Without making any assumption on mobility models, this metric exploits data transmission delays to model complex device mobility. We also extend RCA-ETX with a throughput-optimal stochastic backpressure routing scheme and propose Real-Time Opportunistic Backpressure Collection (ROBC), a protocol to counter the stochastic behaviours resulting from the dynamics associated with mobility. To apply our approaches seamlessly to LoRaWAN-enabled devices, we further propose two new LaRaWAN classes, namely Modified Class-C and Queue-based Class-A. Both of them are compatible with LoRaWAN Class-A devices. Our data-driven experiments, based on the London bus network, show that our approaches can reduce data transmission delays up to 25% and provide a 53% throughput improvement in data transfer performance.
机译：Lorawan是领先的低电源广域网（LPWAN）架构之一。它最初设计用于由静态传感器或物联网（物联网）设备和静态网关组成的系统。它最近更新以引入新的功能，如纳米第二时间戳，打开应用程序以使Lorawan能够用于移动设备跟踪和本地化。在这种移动方案中，由于障碍或深度衰落的干扰，设备可以暂时丢失与网关的通信，导致数据传输中的吞吐量和延迟。为了克服这个问题，我们提出了一种新的数据转发计划。在与网关的下一个联系之前，设备可以将其数据转发到附近具有与网关接触的概率的附近设备的数据。我们提出了一种称为实时联系人预期传输计数（RCA-ETX）的新网络度量，以实时模拟该联系概率。在不对移动模型进行任何假设，该度量可以利用数据传输延迟来模拟复杂设备移动性。我们还将RCA-ETX扩展了​​具有吞吐量最优随机背压路由路由方案，并提出了实时机遇的背压收集（ROBC），一种协议，用于抵消由与移动性相关的动态产生的随机行为。要将我们的方法无缝应用于支持LoraWan的设备，我们还提出了两个新的Larawan类，即修改了Class-C和基于队列的类。它们都与Lorawan类 - 一个设备兼容。我们的数据驱动实验基于伦敦总线网络，表明我们的方法可以将数据传输延迟降低25％，并提供数据传输性能的53％的吞吐量提高。

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