MADHUSANKA LIYANAGE, D.Sc (Tech), is Assistant Professor, School of Computer Science, University College Dublin, Ireland; Centre for Wireless Communications, University of Oulu, Finland. AN BRAEKEN, PHD, is Professor, Industrial Sciences Department, Vrije Universiteit Brussels, Belgium. PARDEEP KUMAR, PHD, is Lecturer/Assistant Professor, Department of Computer Science, Swansea University, Wales, UK MIKA YLIANTTILA, D.Sc (Tech), is Associate Professor, Centre for Wireless Communications, University of Oulu, Finland.