Wireless communication has become a hot research topic in the industrial network. The traditional polling method has the advantages of high stability and reliability,but it cannot provide real-time monitoring for abnormal data of subnodes. A method of adaptive keeping-off competition scheduling to guarantee abnormal data′s real-time access to the channel is designed in this paper. In this method,the polling mode is adopted as the basic communication mode,superframe structure is designed to provide the slot time for data access,and the adaptive keeping-off competition method is adopted to avoid channel collisions. The experimental results show that the method of accessing abnormal data to the channel has high real-time performance and reliability,which can satisfy the strict requirements for abnormal data transmission in industry.%在工业网络中,无线通信已经成为一个研究热点.传统的轮询方法具有可靠、稳定的优点,但对于子节点猝发的异常数据不能做到实时监测.设计一种保证工业异常数据实时接入信道的自适应退避竞争调度方法,该方法以轮询方式作为基础通信方式,并设计超帧结构以提供数据接入时隙,同时采用自适应退避竞争的方法避免信道碰撞.实验结果表明,异常数据以此方式接入信道具有较高的实时性和可靠性,满足工业对异常数据传输的苛刻要求.
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