1. Department of Networked Systems and Services, Faculty of Electrical Engineering and Informatics, Budapest University of Technology and Economics, Műegyetem rkp. 3., 1111 Budapest, Hungary
2. Wireless Multimedia and Networking Research Group, Department of Computer Science, School of Computer Science and Mathematics, Faculty of Science, Engineering and Computing, Kingston University, Penrhyn Road Campus, Kingston upon Thames, London KT1 2EE, UK
3. Sigma Technology, Közraktár Str. 30-32, 1093 Budapest, Hungary