实时环境下一种混合广播调度策略  

Hybrid Broadcast Strategy on Real-time Environment

作　　者：吴海[1] 石磊[1] 卢炎生[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》2009年第5期158-162,共5页Computer Science

基　　金：国家部委重点科技攻关项目(项目号:513150402)资助

摘　　要：在实时的非对称通讯环境下,自适应混合广播策略能够根据数据的请求模式以及时间限制等特征来动态分配周期广播和按需广播的带宽比例。将这一策略推广到基于事务的多数据项广播调度中,同时引入"分布式广播"思想,以更精细的周期广播粒度来解决过长的周期广播与事务及数据的实时要求之间的矛盾,并且动态分配时间槽。实验结果表明:改进的调度策略更适合于实时环境下的数据广播,具有更低的事务失败率以及更小的上行信道负荷。In time-critical asymmetric communication environment, the adaptive hybrid broadcast-- TC-AHB can dynamically assign the bandwidth ratio for periodic broadcast and on-demand broadcast according to data-requested mode and time limit. The paper extended the strategy to the broadcast based on transaction scheduling,adopted an idea called distributed broadcast to solve confliction between a long periodic broadcast interval and real-time requirement of data and transactions and assigned the time slot dynamically. The result of experimentation indicates that the strategies improved on adaptive hybrid broadcast mode are more suitable for data broadcast application in real-time environment and have lower transaction failure ratio and lower uplink load.

关 键 词：混合广播策略 移动事务 分布式广播 事务失败率 

分 类 号：TP393[自动化与计算机技术—计算机应用技术] TP18[自动化与计算机技术—计算机科学与技术]