Abstract: 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.

Key words: mobile internet, user quality of experience, initial buffer time, stalling time, mean opinion score subjective scale form