基于LoRaWAN的自适应多帧高效传输方法  

Method of adaptive multi-frame efficient transmission based on LoRaWAN

作　　者：任智[1] 秦军 姜楠 王坤龙 Ren Zhi;Qin Jun;Jiang Nan;Wang Kunlong(School of Communication&Information Engineering,Chongqing University of Posts&Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《计算机应用研究》2020年第5期1518-1521,1540,共5页Application Research of Computers

基　　金：国家自然科学基金资助项目(61379159);长江学者和创新团队发展计划基金资助项目(IRT1299)。

摘　　要：针对LoRaWAN协议中LoRa网关与LoRa终端间数据多帧传输方式存在控制开销和传输时延较大的问题,提出一种基于LoRaWAN的自适应多帧高效传输方法(adaptive multi-frame efficient transmission,AMFET),包含自适应多帧发送机制、自适应多帧接收确认机制和丢帧识别机制。自适应多帧发送机制对需确认数据消息设置优先等级,对高级需确认数据消息进行立即确认,对低级需确认数据消息在自适应发送模式结束后统一进行确认,同时将Fpending机制引入LoRaWAN上行多帧传输;自适应多帧接收确认机制通过位向量压缩技术记录已接收数据帧信息,从而单次对多个需确认数据消息进行合并确认;丢帧识别机制利用需确认帧编号(confirmed data identity,CDID)识别低级需确认消息是否丢失,避免终端异常进入休眠模式。通过数学分析和实验测试,分别对AMFET方法的性能进行了理论验证和实验验证,验证结果表明,相对于原LoRaWAN多帧传输方式,AMFET方法在保证数据传输可靠性的前提下,有效降低了数据传输时延和数据传输能耗。As for the problem that the control overhead and transmission delay are large in multi-frame transmission mode between LoRa gateway and LoRa terminal in LoRaWAN protocol,this paper proposed an adaptive multi-frame transmission method,which included adaptive multi-frame sending mechanism,adaptive multi-frame receiving confirmation mechanism and frame loss recognition mechanism.The first mechanism set priority level of the confirmed messages,it made confirm immediately for high-level confirmed messages,and confirmed for low-level confirmed messages uniformly after the end of adaptive sending mode.At the same time,it introduced the Fpending mechanism into LoRaWAN uplink multi-frame transmission.The second mechanism recorded the received message frame information by bit vector compression technology,so as to merge to confirm for multiple confirmed messages once.The third mechanism used the CDID value to identify whether the low-level acknowledgment message was lost,and prevented the terminal from entering the sleep mode abnormally.The mathematical analysis and experimental test results show that,compared to the original mechanism,the AMFET mechanism can effectively reduce data transmission delay and data transmission energy consumption on the premise of guaranteeing the reliability of data transmission.

关 键 词：LoRaWAN协议 Fpending机制 位向量压缩 自适应多帧传输 合并确认 

分 类 号：TN915.06[电子电信—通信与信息系统]