电子技术
電子技術
전자기술
ELECTRONIC TECHNOLOGY
2014年
8期
15-20
,共6页
POMDP%接入控制%请求调度%梯度优化
POMDP%接入控製%請求調度%梯度優化
POMDP%접입공제%청구조도%제도우화
POMDP%admission control%request scheduling%policy-gradient approach
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。
由于多媒體業務需要更大的帶寬和更高的實時性,所以對服務繫統和接入控製提齣瞭更高的要求。文章針對分佈式媒體服務繫統提齣瞭一種新穎的接入控製方法,與以往方法不同之處在于將請求調度融閤在接入控製之中,從而提高瞭繫統的服務性能。我們先為繫統建立部分可觀Markov決策過程(POMDP)模型,併將請求調度融閤在決策中,然後使用基于觀測的隨機接入控製策略,通過策略梯度優化算法倣真求解模型的最優策略。倣真結果錶明,與其他分佈式接入控製方法相比,該文所提方法在有效利用繫統資源的同時,提高瞭繫統性能。
유우다매체업무수요경대적대관화경고적실시성,소이대복무계통화접입공제제출료경고적요구。문장침대분포식매체복무계통제출료일충신영적접입공제방법,여이왕방법불동지처재우장청구조도융합재접입공제지중,종이제고료계통적복무성능。아문선위계통건립부분가관Markov결책과정(POMDP)모형,병장청구조도융합재결책중,연후사용기우관측적수궤접입공제책략,통과책략제도우화산법방진구해모형적최우책략。방진결과표명,여기타분포식접입공제방법상비,해문소제방법재유효이용계통자원적동시,제고료계통성능。
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's performance compared with other distributed admission control methods.