分布式媒体服务系统结合请求调度的接入控制研究  

Admission Control of Distributed Media Service System Combined with Request Scheduling

作　　者：尚书楠 殷保群[1] 陆效农[1] 

机构地区：[1]中国科学技术大学自动化系

出　　处：《电子技术（上海）》2014年第8期15-20,共6页Electronic Technology

基　　金：国家自然科学基金(61174124;61233003);高等学校博士学科点专项科研基金(20123402110029);安徽省高等学校自然科学重点项目(KJ2012A286)

摘　　要：由于多媒体业务需要更大的带宽和更高的实时性,所以对服务系统和接入控制提出了更高的要求。文章针对分布式媒体服务系统提出了一种新颖的接入控制方法,与以往方法不同之处在于将请求调度融合在接入控制之中,从而提高了系统的服务性能。我们先为系统建立部分可观Markov决策过程(POMDP)模型,并将请求调度融合在决策中,然后使用基于观测的随机接入控制策略,通过策略梯度优化算法仿真求解模型的最优策略。仿真结果表明,与其他分布式接入控制方法相比,该文所提方法在有效利用系统资源的同时,提高了系统性能。Multimedia services require larger bandwidth and less response time, which raises higher requirements on the service system and admission control policies. This paper presents a novel admission control method aiming at the distributed media service system, which integrates request scheduling into the admission control, so that improving the system performance. The partially observable Markov decision process is built up to model the service system and the request scheduling is integrated into decision-making, and then the random admission control policy based on observation is used to solve the optimal admission policy of the model by applying the policy-gradient approach through computer simulation. The simulation result shows this policy can make efficient use of system resources and improve system＆#39;s performance compared with other distributed admission control methods.

关 键 词：接入控制 请求调度 梯度优化 

分 类 号：TN915[电子电信—通信与信息系统]