移动视频体验质量的量化评价模型

摘要

The research on mobile video Quality of Experience(QoE)is becoming increasingly important, but the exist-ing QoE evaluation models lack the appropriate quantitative methodology. Considering the characteristics of mobile video services, a two-level weighting QoE quantitative evaluation model has been proposed in this paper. The proposed QoE model is made up of six kinds of influence levels according to their first-level weights;further, each influence level con-sists of multiple influence factors. In addition to packet loss and jitter factors, other influence factors have their second-level weights. This paper utilizes the Analytic Hierarchy Process(AHP)method to calculate all first-level weights, and then calculate most of second-level weights in addition to packet loss and jitter factors. Since packet loss and jitter are inter-dependent, it is unable to directly calculate their weights. Therefore, this paper finds their function f(packet loss, jitter)by network simulation experiments, and thus obtains a complete QoE quantitative evaluation model. By the QoE score testing, the proposed QoE quantitative evaluation model achieves a high precision, which proves the reliability of this methodology.%移动视频体验质量(QoE)的研究正变得日益重要,现有的QoE评价模型缺少相应的量化方法.结合移动视频业务的特点,提出了两层权值的QoE量化评价模型,即QoE由六种"影响层面"按各自的一级权值叠加而成;进一步地,每个"影响层面"又由多个"影响因素"构成.除了丢包和抖动两个"影响因素"外,其他"影响因素"均具有独立的二级权值.提出通过层次分析法(AHP)计算出所有的一级权值,并且进一步计算出除了丢包、抖动外的其他二级权值.由于丢包和抖动这两个影响因素相互依赖,无法计算各自的二级权值,因此通过网络模拟实验,找出两者的双变量函数f(丢包,抖动),由此得到完整的两层权值QoE量化评价模型.所提QoE量化评价模型通过测评人员的QoE评分进行验证,实验结果表明该模型获得了较高的准确度,证明了上述模型量化方法的可靠性.