考虑链路重传的工业无线网络确定性调度算法

Orchestration Methods With Determinacy in Wireless Industrial Network by Considering Repeat Transmissions

作为工业网络的关键技术,确定性调度通过合理安排网络传输资源,满足工业数据在规定时间内到达目标设备的实时性要求.工业网络往往部署在环境恶劣、电磁情况复杂的工业现场,与有线网络相比,工业无线网络还面临着严重的丢包问题.考虑到重传是克服链路丢包的简便高效方法,本文提出了支持持续重传和区间重传两种策略的确定性调度算法.基于链路时槽松弛度和动态优先级,调度算法在每个时槽按照调度规则为重传链路配置通信资源,缓解丢包对数据传输的影响,并围绕对应重传策略进行相应的时槽、频点优化分配,保障数据端到端按时到达.仿真结果表明,所提调度算法在满足传输确定性的前提下,有效提升了数据传输的可靠性.

As a key technology of industrial networks,orchestration with determinacy meets the real-time requirement of the industrial data arriving at target device within a specified time by arranging the network transmission resources reasonably.In most cases,the filed environment and electromagnetic situation of industrial networks are harsh and complex.Moreover,compared with the wired networks,the packet loss is a significant problem in industrial wireless networks.Considering that repeat transmission is a simple and efficient method to overcome link packet loss,this paper optimizes link retransmission in the process of orchestration and proposes orchestration methods with determinacy that support consequent retries and interval-working retries respectively.Based on time slot laxities and dynamic priorities of links,the two orchestration algorithms allocate communication resources for the retransmission link in accordance with the orchestration rules at each time slot to alleviate the impact of packet loss on data transmission,and optimize the allocation of time slot and channel resources according to the two retransmission strategies to ensure the timely arrival of end-to-end data.Extensive simulations demonstrate that our orchestration methods enhance communication reliability while the deterministic characteristic is maintained.