论文标题
Lorawan通道访问的数学模型
Mathematical model of LoRaWAN channel access
论文作者
论文摘要
虽然3GPP一直在开发NB-iot，但低功率广泛的网络市场已由廉价且简单的Sigfox和Lora/Lorawan技术掌握。洛万（Lorawan）被定位为具有开放标准的地方，也吸引了研究界的兴趣。具体而言，许多论文介绍了其PHY层的效率。但是，MAC仍被评估不足。现有对洛但的研究没有考虑到确认和重新启动政策，这可能会导致结果不正确。在本文中，我们仔细考虑了Lorawan传播的特殊性，并表明这是该技术最薄弱的问题，这大大提高了检索的故障概率。本文的主要贡献是一个数学模型，该模型准确估计数据包错误率如何取决于所提供的负载。与其他论文相反，这些论文像最大吞吐量一样评估洛万容量，我们的模型可用于查找最大负载，从而允许可靠的数据包交付。
While 3GPP has been developing NB-IoT, the market of Low Power Wide Area Networks has been mastered by cheap and simple Sigfox and LoRa/LoRaWAN technologies. Being positioned as having an open standard, LoRaWAN has attracted also much interest from the research community. Specifically, many papers address the efficiency of its PHY layer. However MAC is still underinvestigated. Existing studies of LoRaWAN do not take into account the acknowledgement and retransmission policy, which may lead to incorrect results. In this paper, we carefully take into account the peculiarities of LoRaWAN transmission retries and show that it is the weakest issue of this technology, which significantly increases failure probability for retries. The main contribution of the paper is a mathematical model which accurately estimates how packet error rate depends on the offered load. In contrast to other papers, which evaluate LoRaWAN capacity just as the maximal throughput, our model can be used to find the maximal load, which allows reliable packet delivery.
