总线控制网络中基于优先级CSMA/CD协议的改进  

Improved Priority-Based CSMA/CD Protocal in Bus-Topology Control Network

作　　者：彭可[1] 陈岚[1] 陈际达[1] 

机构地区：[1]中南大学信息科学与工程学院,湖南长沙410083

出　　处：《小型微型计算机系统》2004年第7期1235-1238,共4页Journal of Chinese Computer Systems

基　　金：湖南省科技厅工业攻关项目 (0 0 GKY2 0 5 3 )资助

摘　　要：总线控制网络的 MAC层协议对网络实时特性具有重要影响 .结合优先级 CSMA/ CD协议的等级原则与 To-ken Bus协议的均衡思想 ,提出了一种改进的总线优先级轮循 CSMA/ CD协议 .其高级别的总线优先级类似于 TokenBus协议中的令牌 ,在各节点之间轮循传递 ;使控制网络在遵循整体分级的原则下 ,相同类型节点的性能局部能够相对均衡 .详细阐明了该改进基本思想 ,概述其具体实现方式 ,并给出了对比仿真结果 .该改进协议对于 CAN等基于优先级 CSMA/The MAC protocol of bus topology control network greatly influences network real time. This paper proposes an improved priority rotated CSMA/CD protocol, based on both hierarchy of priority based CSMA/CD and balance of token bus protocols. The highest priority rotates among all nodes just like the token in token bus protocol. It thus makes them possible, for the whole network to operate hierarchically and for the same nodes to act similarly in local. The outlines of improvement are detailed and the implementation method is summarized. The comparative simulation results are also given. This improved protocol is of applied value to control networks adopting priority based CSMA/CD protocols, such as CAN.

关 键 词：总线控制网络 基于优先级CSMA/CD 令牌总线 优先级轮循CSMA/CD 采样周期 

分 类 号：TP393[自动化与计算机技术—计算机应用技术] TP273[自动化与计算机技术—计算机科学与技术]