The Research of Network-induced Delay Measurement Methods in Wireless Networked Control Systems based on Zigbee Network

6th Annual 2018 International Conference on Geo-Spatial Knowledge and Intelligence

Lu, Feiping^1 ; Xue, Wen^1 ; Zeng, Zhaozhou^1

Shanghai Electric Control Institution, Shanghai

200092, China^1

关键词: Clock Synchronization;    Compensation measures;    Measurement precision;    Network data transmission;    Network-induced delays;    Real time measurements;    Wireless networked control systems;    ZigBee wireless networks;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/234/1/012113/pdf
DOI  :  10.1088/1755-1315/234/1/012113

来源: IOP

【 摘 要 】

The large and random network-induced delay in ZigBee wireless network seriously reduce the performance of wireless networked control systems (WiNCS) based on ZigBee network, due to unreliable communication, limited bandwidth, as well as high bit error rate of ZigBee network. Compared with other methods, such as converting time-varying network-induced delay into a fixed value, assuming network-induced delay under a certain statistical law, real-time measurement and compensation of random network-induced delay can effectively improve the performance of WiNCS. In order to obtain the network-induced delay of WiNCS based on ZigBee network on-line, this paper deeply analyzes the composition of delay, provides three delay measurement methods, clock synchronization method, confirm mechanism method and online estimation method, and designs a WiNCS network data transmission experimental platform. Then measurement precision of this measurement methods are analyzed by experiments that based on the experimental platform. The experiments show that, these measurement methods achieve very high measurement precision by taking compensation measures.