Justus Beyer

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With the advent of computer games, game providers try to improve their users’ experience by ensuring high platform and transmission performance, by developing new interaction techniques and more interesting interfaces, or by launching new game ideas. However, it is still unclear how this affects user-perceived Quality of Experience (QoE). In this paper, we(More)
Cloud based games have significantly larger network bandwidth requirements when compared with traditional online games (up to two orders of magnitude). Differences in transmission characteristics can be observed not only between various cloud gaming platforms, but also between different games played on the same platform. As the differences between games on(More)
In this paper, we present initial results from the evaluation of two computer games provided by a prototypical cloud gaming service provider. An experiment is described which addresses the impact of transmission bandwidth and delay on different aspects of user-perceived quality. It is analyzed with respect to the impact of the experimental procedure and(More)
This paper reports on activities in Study Group 12 of the International Telecommunication Union (ITU-T SG12) to define a new Recommendation on subjective evaluation methods for gaming Quality of Experience (QoE). It first resumes the structure and content of the current draft which has been proposed to ITU-T SG12 in September 2014 and then critically(More)
In this paper we present results from the Quality of Experience (QoE) evaluation of two commercially available games on four different smartphones and tablets with screen sizes between 3.27” and 10.1”. The tests were conducted in a neutral lab and a simulated metro environment. Results show a considerable impact of display size on overall quality as well as(More)
Subjective self-assessment is a frequently used method when it comes to Quality of Experience assessment in general. If correctly used a variety of scales can be applied to assess the quality of cloud gaming for different constructs such as experienced quality or flow. Besides self-assessment, physiological correlates are a promising method to measure the(More)
Studying cloud gaming QoE, we found the video compression bitrate and the played game level to significantly influence the system’s feedback delay. We present a novel lowcost approach to accurately measure the latency between a user command and the system response using the popular Arduino microcontroller platform and conclude with lessons learned for(More)
Cloud Gaming is a paradigm shift in that games are not executed on the player's device but on a remote server, which delivers a live video stream of the game over the network to the client and takes input commands in return. We present the first truly mobile open-source cloud gaming system, which runs instances of the Android Open Source Project (AOSP)(More)
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