分布式多点控制单元的模型与实现  

Model and Implementation of Distributed Multipoint Control Unit

作　　者：杜瑾[1] 郑庆华[1] 朱晓园[1] 

机构地区：[1]西安交通大学电子与信息工程学院,西安710049

出　　处：《西安交通大学学报》2003年第10期1003-1007,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(60103022);国家"十五"重大科技攻关项目;教育部重大资助项目.

摘　　要：针对集中式多点控制单元(MCU)存在的负载集中、扩展性差、规模受限和故障容错能力差等问题,提出了一种基于软件的分布式MCU模型,它采用组播和单播相结合的数据传输策略,支持跨网段的数据传输.同时,还分析了分布式MCU的群组交互能力和故障恢复机制.测试及实际应用表明:与集中式MCU相比,分布式MCU不仅可以有效地扩大群组交互的规模,而且在故障容忍及恢复方面也有明显改进.目前该模型已在多媒体同步实时授课系统Smart RealClass中得到应用.Aiming at the issues existing in centralized multipoint control unit (MCU), such as concentrated traffic load, limited scale, poor extensibility and faults tolerance and so on, a distributed MCU model is proposed. It utilizes an unicast and multicast data transmission strategy, so that not only can it transmit the media stream across sub networks, but also can decrease the data traffic dramatically. Some performances of distributed MCU, including the scale of group communication and fault tolerance and recovery, are analyzed in detail. The proposed model is already tested and applied to the real-time tele-teaching system named Smart-Real Class. It is shown that the model can support larger scale group communication, balance the communicative traffic among MCUs, and has the ability to tolerate and recover the fault of any MCU.

关 键 词：多点控制单元 群组交互 故障容忍 

分 类 号：TP31[自动化与计算机技术—计算机软件与理论]