Design and analysis of communication scheduling applied in water inrush perception layer of mine Internet of things

摘要

Aiming to improve the deterministic and real-time performance of information sharing among dispersed measure-nodes of a traditional mine water inrush monitoring platform, a communication scheduling controlled by a static message matrix is presented in this paper, which is designed in the model of Time-triggered Controller Area Network (TTCAN). Nine parameters are covered in our monitoring system and four kinds of signal period and priority are allocated to corresponding messages respectively in order to enhance the real-time performance of information transmission, allowing for the fact that each kind of parameter in the measuring system has its own rate of change and affects measurement process diversely. In addition, this paper cites a scheduling algorithm based on average amount analysis to build a matrix cycle applied in TTCAN protocol and appends redundant time-master nodes, so that all messages can be exchanged timely in the order of their priority and transmission process can be anticipated through the matrix cycle. The results of analysis demonstrate that the scheduling strategy meet real-time requirements and bandwidth availability ratio can be 57.77% theoretically. Besides, the addition of redundant time-master nodes has improved the reliability of message transmission.