文献类型：会议论文

英文题名：A Novel Feedback Scheduling Approach for Resource-constrained Network Control System

作者：Qi-Zhang[1];Tang, Xian-ming[1];Yu, Jin-shou[1]

机构：[1]E China Univ Sci & Technol, Res Inst Automat, Shanghai 200237, Peoples R China

会议论文集：4th International Conference on Networked Computing and Advanced Information Management

会议日期：SEP 02-04, 2008

会议地点：Gyeongju, SOUTH KOREA

语种：英文

外文关键词：Feedback control - Networked control systems

摘要：In networked control system (NCS), increasing network workload would make network resource scare and yield unaccepted QoC of subsystems. Deadband scheduling is proved a better scheduling method than traditional static schedule to solve the problem by reducing network traffic to improve overall system's QoC. However, fixed deadband range in primal deadband scheduling couldn't be dynamically adjusted with respect to network utilization and control performance variation of each subtask. In the context of control and network scheduling co-design, model based deadband feedback scheduling approach (MBDFS) proposed in this paper is applied to enhance QoC of the overall system under overloaded condition. In this approach, a task that deadband feedback control should be carried on is dynamically selected and the deadband range is adjusted based on a specified mathematic model which takes into account dynamic changes of subtask's own QoC as well as network utilization. Simulation results indicate the scheduling approaches proposed can effectively improve overall system's QoC in the circumstance of narrow network bandwidth and overload network condition.