移动互联网下视频时延的用户体验质量研究

Research on user experience quality about the time delay of videos on mobile internet

随着移动互联网的发展,移动视频业务的迅速爆发,良好的用户体验质量(QoE)成为运营商挽留用户的关键因素。从用户体验角度,建立不同时延下移动视频业务的评价量化标准。通过情景实验模拟的方法,以平均主观意见分(meanopinionscore,MOS)量表建立用户视频体验质量的实数映射关系。针对用户对视频观看时延的有效反应进行分级研究,得到以下结果:单次和多次的初始缓冲时延和卡顿时延对用户观看移动视频的影响并建立用户体验质量评价等级。在短视频中出现单次时延在4s以上,用户会出现负面情绪;在相同延迟时长下,单次的初始缓冲时延的用户体验质量略优于卡顿时延;对于在一定播放时长的移动视频业务中出现多次卡顿,卡顿时延短但是间隔频繁的体验质量比卡顿时延长但是间隔时间长的体验质量要更差。

With the development of mobile Internet and the rapid growth of mobile video services, satisfactory quality of experience(QoE) has become a key factor for operators to retain users. Quantitative evaluation criteria was established for mobile video services with different kinds of time delay from the perspective of user experience. According to the method of scenario simulation, a real mapping relationship of the user experience quality was proposed in the subjective scale form of the mean opinion score(MOS). Then a hierarchical study was taken on users’ effective response to delayed videos. The effect of single and multiple initial buffer time and stalling time on user experience quality was obtained. Besides, the evaluation level system of user experience quality was created. In a short video, negative user experience occurs when there is a single delay longer than four seconds. Under the circumstance of the same delay duration, the user experience quality of the initial buffer time is slightly better than that of the stalling time. If many delays occur in a certain mobile video service, compared with a lower frequency of long delays, the short but frequent delays will bring more negative experience to users.