视频业务的分布式协同接入控制建模  

Distributed Collaborative Admission Control Model of Video Service

作　　者：刘兴华[1] 奚宏生[2] 

机构地区：[1]中国科学技术大学信息学院自动化系,合肥230027 [2]中国科学技术大学信息科学技术学院自动化系,合肥230027

出　　处：《新型工业化》2013年第1期68-78,共11页The Journal of New Industrialization

基　　金：国家重点基金专项(61233003);教育部博士点基金(20093402110019)

摘　　要：基于三层架构的映射框架,本文研究了分布式协同接入控制的建模和调控机理。因为视频业务已成为引起接入网性能瓶颈的主要因素,所以本文以视频业务为主要研究对象。假设视频业务需求近似服从泊松分布,而服务时间服从指数分布,将一个资源节点上的业务接入状态的演化用Markov过程来描述,则所有的N个资源节点的分布式协同接入控制可以由一个马尔可夫切换空间控制过程来阐述。针对构建的马尔可夫切换空间控制系统,基于系统灵敏度的观点对系统性能进行优化,本文提出了基于策略梯度的随机逼近算法。同时,本文给出了一个仿真算例来说明此随机逼近算法的有效性。最后对本文进行了简单的总结。Based on the three layer structure of the mapping framework, this paper studies the modeling of distributed collaborative admission control and mechanism. Since the video service has become the main factors of performance bottleneck about access network, then the video service is considered as the main research object in this paper. We assume that video service requirements approximate poisson distribution and service time obeys exponential distribution. Then a resource node in the evolution of the state of the service has access to Markov process. Accordingly, all the N resource nodes of distributed collaborative admission control can be made by a Markov switching space control system to elaborate. According to the Markov switching system, we optimize the performance of the system from the point of view of sensitivity and this paper puts forward the stochastic approximation algorithm based on the strategy of the gradient. Finally, we give an example to show the effectiveness of the method in this paper.

关 键 词：控制理论与控制工程 马尔可夫决策过程 马尔可夫切换系统 性能势 策略迭代 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术] TN9[电子电信—信息与通信工程]