远程NCS的QoS调度策略研究  

Research on QoS Scheduling Strategies for Remote NCS

作　　者：邬春学[1] 郭贤辉[1] 

机构地区：[1]上海理工大学计算机与电气工程学院,上海200093

出　　处：《计算机科学》2009年第5期56-59,共4页Computer Science

基　　金：国家自然科学基金项目(60573142);湖北省自然科学基金项目(2004ABA076);湖北省教育基金重点项目(2004D003;D200512002);科学研究计划技术创新基金项目(J200512001)资助

摘　　要：由于Internet只提供尽力而为服务,其随机、不确定的延时,不能保证基于Internet的远程NCS实时性等QoS要求,使得控制系统的稳定性很差。在IP网传统分布式QoS路由策略的基础上,提出一种基于数据优先级机制和指令推测技术的远程NCS的QoS调度策略。通过NS2仿真实验表明,在网络负载不过大时,该QoS调度策略能有效保证远程NCS的系统延时,有助于提高网络的带宽接纳率和控制系统的可靠性。As Internet only provides best effort service,its random and uncertain delay can not guarantee QoS requirements, such as real-time performance, for remote networked control systems based on Internet, making the stability performance of control systems poor. On the basis of the traditional distributed QoS routing strategies for IP-network,we put forward an QoS scheduling strategy, based on data priority mechanism and instruction speculate technology, for remote NCS. It was illustrated through the NS2 simulation experiments that the proposed QoS scheduling strategy can guarantee the delay of remote NCS effectively when the network is not overloaded. It is helpful to improve network bandwidth acceptance rate and the reliability of control systems.

关 键 词：网络控制系统 调度策略 QOS约束 优先级 指令推测 NS2仿真 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]