Efficient VoIP support in OFDMA-based packet radio networks
Supporting voice service through VoIP protocol in cellular packet radio networks inevitably encounters different challenges caused by inherent VoIP traffic characteristics, strict QoS criteria, and high capacity demand.
With the convergence of all mobile services into all-IP networks, the circuit switched domain will no longer exist in future cellular networks and thus voice service will also be provided in the packet switched domain only. Supporting voice service through VoIP protocol in cellular packet radio networks inevitably encounters different challenges caused by inherent VoIP traffic characteristics, strict QoS criteria, and high capacity demand.
Thesis of MSc (Tech) Yong Fan considers the efficient support of voice service in OFDMA-based packet radio networks, using UTRAN LTE radio network as an application example. The biggest challenge in conveying voice service through VoIP protocol in UTRAN LTE networks is the large amount of physical layer control signaling overhead associated with huge VoIP capacity demand. Three distinctly different solutions are then proposed to handle this challenge.
The first two solutions, fully dynamic scheduling with packet bundling and semi-persistent scheduling, both aim at reducing the consumption of physical control channel resources. The third one, PDCCH power control, targets actively conducting effective physical control channel resource allocation instead. All the related VoIP-specific RRM algorithms supporting these solutions are also presented. Altogether they form a framework for efficient VoIP support in the UTRAN LTE network, which can naturally be applied to other emerging OFDMA-based packet radio systems.
The effectiveness of the proposed solutions is validated through large-scale quasi-static system level simulations and the obtained simulation results further confirm their effectiveness. Based on the simulated performance results, flexible utilization of different VoIP packet scheduling algorithms is discussed and a possible switching mechanism in between is also proposed.
Public defence of a doctoral dissertation on Monday, 4 June
The doctoral dissertation of MSc (Tech) Yong Fan “Efficient VoIP Support in OFDMA-based Packet Radio Networks" will be publicly examined at the Faculty of Computing and Electrical Engineering of Tampere University of Technology (TUT) in room TB109 in the Tietotalo building (address: Korkeakoulunkatu 1, Tampere, Finland) on Monday, 4 June at 12:00.
The opponent will be Professor Savo Glisic (University of Oulu). Professor Mikko Valkama from the Department of Communications Engineering at TUT will act as Chairperson.
Further information:
Yong Fan, Department of Communications Engineering, tel. +358 41 7018801, yong.fan@tut.fi