基于二元指数后退算法的LoRaWAN协议  

LoRaWAN Protocol Based on Binary Exponential Backoff Algorithm

作　　者：屈春晓 任久春[1] 朱谦[1] QU Chunxiao;REN Jiuchun;ZHU Qian(School of Information Science and Technology,Fudan University,Shanghai 200433,China)

机构地区：[1]复旦大学信息科学与工程学院

出　　处：《计算机工程》2019年第12期103-108,133,共7页Computer Engineering

基　　金：上海市体育科技“综合计划”项目(162019)

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。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.

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 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]