Novel Cross-Layer QoE-Aware Radio Resource Allocation Algorithms in Multiuser OFDMA Systems

Published by: LTFE | 26. Sep 2014
Authors: Rugelj, M., Sedlar, U., Volk, M., Sterle, J., Hajdinjak, M., Kos, A.

The assurance of quality of experience (QoE) and provisioning of high throughput of the system represent the main goals of future wireless and mobile networks. This paper presents novel and practical cross-layer QoE-aware radio resource allocation (RRA) algorithms for the downlink of a heterogeneous orthogonal frequency division multiple access (OFDMA) system. The objective of the proposed algorithms is to assure the appropriate level of QoE for each user of the system by incorporating application-layer parameters and subjective human perception of quality into the RRA process. We propose two user-oriented joint subcarrier and power allocation algorithms with low complexity for real-time and interactive services. The first algorithm dynamically allocates resources by assuring the same level of QoE to all users of the system, whereas the second algorithm introduces the efficient trade-off between the user’s QoE and the spectral efficiency of the system. By considering application-layer parameters and user’s perception of quality, high users’ QoE and explicit control of data rates can be achieved. The numerical results show that the proposed algorithms achieve significant increase in the level of QoE compared to previous works, a fair distribution of capacity among users and near to optimal solution of QoE for the OFDMA system.


Objavljeno v: IEEE Transactions on Communications publication information (Volume:62, Issue: 9)


WEB on TV: Cross-National User Study for Designing Better User Experience

Published by: LTFE | 04. Okt 2013
Authors: Emilija Stojmenova, Jože Guna, Daniela Hauswirth, Roland Winkler, Manfred Ninaus and Matevž Pogačnik


Na konferenci MindTrek, ki je potekala med 1. in 3. oktobrom v Tampere, na Finskem, smo predstavili prispevek “WEB on TV: Cross-National User Study for Designing Better User Experience”
Avtrorji: Emilija Stojmenova, Jože Guna, Daniela Hauswirth, Roland Winkler, Manfred Ninaus and Matevž Pogačnik
In this paper we present the user studies conducted as a part of an international project EU SEE TV-WEB, funded by the European Union. The project combines the traditional broadcast world with the dynamic web environment while focusing on the aspects of usability and user experience in order to provide the best possible experience for the elderly people, economically weak people and people living in rural areas who do not usually use personal computers and who have no Internet connection. The results of the user studies about the media literacy, media use and the target users’ interest about TV-WEB services, conducted as a part of the project in two different European countries i.e. Austria and Montenegro, are also presented. Additionally, we present the user-centered design process for the service that was conducted as a part of the user study in Slovenia.

In this paper we present the user studies conducted as a part of an international project EU SEE TV-WEB, funded by the European Union. The project combines the traditional broadcast world with the dynamic web environment while focusing on the aspects of usability and user experience in order to provide the best possible experience for the elderly people, economically weak people and people living in rural areas who do not usually use personal computers and who have no Internet connection. The results of the user studies about the media literacy, media use and the target users’ interest about TV-WEB services, conducted as a part of the project in two different European countries i.e. Austria and Montenegro, are also presented. Additionally, we present the user-centered design process for the service that was conducted as a part of the user study in Slovenia.


Prispevek je bil predstavljen na konferenci MindTrek, ki je potekala med 1. in 3. oktobrom v Tampere, na Finskem.


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