计算机工程 ›› 2019, Vol. 45 ›› Issue (12): 103-108,133.doi: 10.19678/j.issn.1000-3428.0053199

• 移动互联与通信技术 • 上一篇    下一篇

基于二元指数后退算法的LoRaWAN协议

屈春晓, 任久春, 朱谦   

  1. 复旦大学 信息科学与工程学院, 上海 200433
  • 收稿日期:2018-11-22 修回日期:2018-12-27 发布日期:2019-12-10
  • 作者简介:屈春晓(1994-),女,硕士研究生,主研方向为无线通信、物联网技术;任久春,讲师;朱谦,副教授。
  • 基金项目:
    上海市体育科技"综合计划"项目(162019)。

LoRaWAN Protocol Based on Binary Exponential Backoff Algorithm

QU Chunxiao, REN Jiuchun, ZHU Qian   

  1. School of Information Science and Technology, Fudan University, Shanghai 200433, China
  • Received:2018-11-22 Revised:2018-12-27 Published:2019-12-10

摘要: 通过对LoRaWAN协议信道接入过程进行分析,发现其在网络负载大的情况下数据传输成功率较低。考虑到提高传输成功率能够有效减少终端重传的次数,降低功耗从而延长终端寿命,因此将LoRaWAN协议与二元指数后退算法相结合,提出一种改进协议。采用简单状态机描述原始协议和改进协议的数据传输过程,并利用概率分析进行数学建模。基于MATLAB的仿真结果表明,改进协议能够有效提升网络传输成功率,虽然网络平均延时相应增加,但可通过增大带宽补偿此方面不足。

关键词: 低功耗广域网, LoRaWAN协议, LoRa调制, 二元指数后退算法, 信道接入

Abstract: Analysis on the channel access of the LoRaWAN protocol indicates that the success rate of data transmission is low under heavy network load.However,a high success rate of data transmission is required to save energy and extend the life of terminal devices by reducing retransmission times.To address the problem,this paper proposes an improved protocol combining the LoRaWAN protocol and the binary exponential backoff algorithm.Data transmission of the original protocol and the improved protocol are described by using simple state machines,and modeled mathematically by using probability analysis.Matlab-based simulation results show that the constructed mathematical model matches actual states of the system,and the improved protocol can efficiently increase the success rate of network transmission.Though the average network delay is also increased,it can be offset by adding bandwidth.

Key words: Low-Power Wide-Area Network(LPWAN), LoRaWAN protocol, LoRa modulation, binary exponential backoff algorithm, channel access

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