异步环境中基于时钟精度差的时钟同步  

Clock Synchronization Based on Clock Precision Difference in Asynchronous Environments

作　　者：赵英[1] 潘立登[1] 

机构地区：[1]北京化工大学网络中心,北京100029

出　　处：《计算机工程》2004年第18期38-40,共3页Computer Engineering

摘　　要：在异步通信模型的基础上,提出了一个基于时钟精度差的时钟同步策略,并给出了一个完整的系统模型。研究的重点有3个方面:(1) 在时钟同步过程中使用单向信息传输策略,可以有效地减少网络负载;(2) 客户机使用本地节点的时间信息和来自于参考时钟的时间戳 信息构造一个线性数学模型,并获得本地时钟与参考时钟的运行精度差;(3) 根据本地节点计算出的时钟精度差,构造一个自适应的容错 模型,能够保证当本地节点与参考节点的连接出现故障时,本地的时钟同步系统还能够正常工作。该文不仅给出了一个详细的数学模型,而且还在实际的Internet环境中进行了模拟试验,取得了满意的结论。This paper presents an innovative strategy and model to synchronize all virtual clocks in asynchronous Internet environments. The paper makes three major contributions to this research area. Firstly, one-way information transmission is applied to reduce traffic overhead on Internet for the purpose of clock synchronization. Secondly, the slave nodes use local virtual time and the arrival timestamp, from the reference node, to create linear mathematical trend models and to retrieve the clock precision differences between reference clock and slave clocks. Finally, a fault-tolerant and self-adaptive model executed by each slave node based on the above linear trend model is created in order to ensure that the virtual clock is running normally, even when the link between the reference node and this slave node has crashed. It also presents detailed simulations of this strategy and mathematical analysis on real Internet environments.

关 键 词：时钟同步 精度差 异步环境 自适应 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]