The role of psychophysics laws in quality of experience assessment: a video streaming case study

S. Khorsandroo, R. M. Noor, Sayid Khorsandroo
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引用次数: 6

Abstract

The wide range of multimedia services has been attracting more users every day, while the increasing number of users plays an important role in the competitive advantage for network/service providers. Due to the fact that the users are the ones who pay for services, their satisfaction is an important goal for each provider in order to survive in the highly competitive market of multimedia services. Because of the nature of multimedia services, users can instantly detect any quality disturbances. For example, users might tolerate several interruptions during a download or upload process, but they may get irritated as soon as they experience a small amount of voice or video disturbance while they are watching their favorite movie through the internet for instance. Thus, quality of experience (QoE) should be maintained at a steady and acceptable level to satisfy users. To do so, it is necessary to identify the contributing factors in the network which affect multimedia quality. Generally speaking, delay, jitter, loss, and bandwidth have considerable impact on multimedia service quality. Because quality of service (QoS) is among the greatest impacting factors of QoE, it seems required to define a quantitative relation between QoE and QoS in order to keep the QoE at an acceptable level. This paper aims to benefit from psychophysics laws to devise quantitative relations which explain the interdependency of QoE and QoS. The proposed quantitative relations are expressed as equations which are then compared in theoretical and experimental setting to indicate which one can better reflect the relationship between QoE and QoS. A video streaming service affected by packet loss was also chosen as a candidate for our test bed. The test-bed results are then estimated by non linear regression and then validated by goodness of fit indexes. In this way, it can be examined how strongly each equation can express the dependency between QoE and QoS.
心理物理学定律在体验质量评估中的作用:视频流案例研究
广泛的多媒体业务吸引了越来越多的用户,而用户数量的增加对网络/服务提供商的竞争优势起着重要的作用。由于用户是为服务付费的主体,因此用户的满意度是每个提供商在竞争激烈的多媒体服务市场中生存的重要目标。由于多媒体业务的性质,用户可以立即检测到任何质量干扰。例如,用户在下载或上传过程中可能会忍受几次中断,但当他们通过互联网观看他们最喜欢的电影时,一旦遇到少量的声音或视频干扰,他们就会感到恼火。因此,体验质量(QoE)应保持在稳定和可接受的水平,以满足用户。要做到这一点,有必要确定网络中影响多媒体质量的因素。一般来说,延迟、抖动、丢失和带宽对多媒体业务质量的影响比较大。由于服务质量(QoS)是影响QoE的最大因素之一,因此为了使QoE保持在可接受的水平上,似乎有必要定义QoE和QoS之间的定量关系。本文旨在利用心理物理学定律设计定量关系来解释QoE和QoS的相互依赖性。将提出的定量关系表示为方程,然后在理论和实验环境中进行比较,以表明哪一个方程能更好地反映QoE和QoS之间的关系。受丢包影响的视频流服务也被选为我们测试平台的候选对象。然后用非线性回归对试验台结果进行估计,再用拟合优度指标进行验证。通过这种方式,可以检查每个方程表达QoE和QoS之间依赖关系的强度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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