Defence of dissertation in the field of Computer Science, Teemu Kämäräinen, M.Sc.

In the dissertation "Understanding and Optimizing Delay-Sensitive Interactive Mobile Application Systems" we dissect the entire delay pipeline in latency critical mobile video applications through extensive measurements. We study the server-side architecture possibilities, introduce novel ways to measure the client hardware delays and perform a latency study to determine the impact of data center location count to the overall latency.

Mobile video services are usually offered through centralized cloud servers and account for over half of the total data consumption of mobile networks. In addition to the traditional video applications, new types of latency critical video services have emerged in recent years which also require or would benefit from cloud deployment. These applications include mobile cloud gaming and mobile aug-mented and virtual reality. The latency from user input to response needs to be low for all of the example applications to ensure a good quality of experience.

In this thesis, we dissect the entire delay pipeline in latency critical mobile video applications through extensive measurements. Regarding cloud gaming, we per-form a Europe-wide latency study to determine the impact of data center location count to the overall latency. We also study the server-side architecture possibilities and introduce novel ways to measure the client hardware delays.

In addition, we present specific methods to extend remote rendering also to virtual reality applications. Using the findings of this thesis, service providers can design the architecture and distribution of their systems based on the specific latency requirements of their application.

Opponent: Professor Gwendal Simon, IMT Atlantique, France

Custos: Professor Antti Ylä-Jääski, Aalto University School of Science, Department of Computer Science

Contact information: M.Sc. Teemu Kämäräinen, Department of Computer Science, [email protected], tel. 040 7600 684

Electronic dissertation: http://urn.fi/URN:ISBN:978-952-60-8767-2

The dissertation is publicly displayed at the noticeboard of the School of Science, Konemiehentie 2, Espoo ten days before the public defence.