基于排队论的工业无线传感网超帧结构研究

Research on Super-frame Structure of Industrial Wireless Sensor Network Based on Queuing Theory

随着无线传感器在工业场景中的大量应用,对于工业无线传感器网络的研究变得更加重要。针对目前工业无线传感器网络中数据传输采用的IEEE 802. 15. 4标准超帧结构在数据包排队方式的不足,为了满足工业应用场景中的实时性要求,更加精确地评估数据延迟与占空比等网络指标,提出一种优化排队方式的超帧结构。首先,利用排队论为IEEE802. 15. 4标准超帧结构中的竞争访问控制阶段(CAP)与非竞争访问控制阶段(CFP)建立数学模型,更加合理地分析超帧数据延迟;然后,根据排队论的性能分析,提出一种单队列排队超帧结构,相对于原始超帧结构,单队列排队结构能有效降低数据包的传输延迟,提高网络利用率。仿真结果验证了延迟模型的合理性和优化超帧结构的正确性,能满足工业物联网应用中的实时性要求。

With the application of wireless sensor in industrial environment,the research on industrial wireless sensor network becomes more important.Aiming at the deficiency of packet queuing mode of IEEE 802.15.4 standard super-frame structure in data transmission in industrial wireless sensor network at present,in order to meet the real-time requirements in industrial application environment and accurately evaluate network indexes such as data delay and duty cycle,we propose an optimized queuing super-frame structure.Firstly,the queuing theory is used to establish a mathematical model for the contention access period(CAP)and the contention-free period(CFP)in the IEEE 802.15.4 standard super-frame structure and analyze the super-frame data delay more reasonably.Then,according to the performance analysis of queuing theory,a single-queue queueing super-frame structure is proposed.Compared with the original super-frame structure,the single-queue queuing structure can effectively reduce the transmission delay of packet and improve the network utilization rate.The simulation results verify the rationality of the latency model and the correctness of the optimized super-frame structure,which can meet the real-time requirements in the application of industrial IoT.