| 并发多媒体服务系统超载模型分析 |
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| 引用本文： | 张明龙,冯博琴,王雪平.并发多媒体服务系统超载模型分析[J].西安交通大学学报,2006,40(2):161-164. |
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| 作者姓名： | 张明龙 冯博琴 王雪平 |
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| 作者单位： | 1. 西安交通大学电子与信息工程学院,710049,西安
2. 西安电子科技大学应用数学系,710071,西安 |
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| 摘 要： | 在超载的情况下根据排队论理论对多媒体应用服务器建模，即将视频点播系统归结为一个受限源为N的M／M／1排队和多个串行封闭排队队列．通过对模型的分析表明：系统的服务质量（QoS）和高可靠性与系统中并发的数据服务器数目N、单个数据服务器提供的媒体数据服务实例数n相关，通过正确调整N与n之间的比率，系统可以获得较高的QoS；按照不同比率调整N与n的关系，系统将获得不同的可靠性服务．仿真实验表明，在超载情况下所建模型的理论计算与实验结果的吻合度可达到95％以上，利用它可以指导设计并发多媒体服务系统．
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| 关 键 词： | 超载模型 排队论 视频点播 |
| 文章编号： | 0253-987X（2006）02-0161-04 |
| 收稿时间： | 2005-05-31 |
| 修稿时间： | 2005年5月31日 |
Analysis of Overloaded Model of Concurrent Multimedia Service Systems |
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| Zhang Minglong,Feng Boqin,Wang Xueping.Analysis of Overloaded Model of Concurrent Multimedia Service Systems[J].Journal of Xi'an Jiaotong University,2006,40(2):161-164. |
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| Authors: | Zhang Minglong Feng Boqin Wang Xueping |
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| Abstract: | An abstract model of multimedia servers was built under the condition of overload according to the queuing theory.Thus,the VOD(video on demand) system was reduced to an M/M/1 queue and many closed-queues with limited resources N.By analyzing the model,it shows that the available QoS(quality of service) and service with high reliability are related to the number of concurrent multimedia servers N and the number of service instances n provided by a multimedia server in the system.The higher QoS can be obtained by adjusting the ratio of N to n,with which the different high reliability services are achieved.Simulation tests indicate that the coincidence between the theoretical and experimental results of the model is up to 95% under the overload condition.This model can guide the design of multimedia systems effectively. |
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| Keywords: | overloaded model queuing theory video on demand |
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