支持断接的移动实时事务调度  

Scheduling Strategies of Real-Time Transactions with Disconnections in Mobile Computing Environment

作　　者：刘云生[1] 王丽娜[1] 廖国琼[1] 

机构地区：[1]华中科技大学计算机学院,武汉430074

出　　处：《计算机科学》2005年第4期155-157,162,共4页Computer Science

基　　金：国家自然科学基金(编号60073045);国防预研基金(编号00J15.3.3.JW0529);中国博士后科学基金(2003034482);华中科技大学博士后科学基金(2003021)

摘　　要：在移动计算环境中,事务移动性和频繁断接使得传统实时事务调度机制不足以支持移动实时事务的执行。该文给出了一个支持无线网络频繁断接的软实时事务调度协议SSRTD。该协议是基于事务具有扩展截止期和结果相似性进行设计的,并可根据移动主机的连接状况决定事务执行结果的发送时间。通过性能测试,表明所提出的调度策略能提高移动实时事务的成功率。In mobile computing environment, for transaction's mobility and frequent discormection, the traditional re- al-time scheduling mechanisms are not suitable for the execution of mobile real-time transactions. In this paper a scheduling protocol SSRTD for soft real-time transactions is proposed, which is designed based on the extended dead- line and result similarity. The transmitting time of transaction's results from base servers to mobile hosts is deter- mined by the connection status of mobile hosts. According to the performance tests, the suggested scheduling strate- gy can improve the success ratio of real-time transactions.

关 键 词：无线网络 移动实时数据库系统 软实时事务调度协议 执行模型 并发控制机制 

分 类 号：TN929.5[电子电信—通信与信息系统] TP311.13[电子电信—信息与通信工程]