Advances in Radio Science www.adv-radio-sci.net 1684-9965 1684-9973 2 Kleinheubacher Berichte 2003 2004 10.5194/ars-2-155-2004 http://www.adv-radio-sci.net/2/155/2004/ http://www.adv-radio-sci.net/2/155/2004/ars-2-155-2004.html http://www.adv-radio-sci.net/2/155/2004/ars-2-155-2004.pdf 155 162 2005-05-27 Applicability of new radio technologies for advanced UMTS networks A. Dekorsy M. Schacht S. Brueck G. Fischer Lucent Technologies Networks System GmbH, Thurn-und-Taxis-Strasse 10, 90411 Nuremberg, Germany An expanded effort is under the way to support the evolution of UMTS (Universal Mobile Telecommunication System). Apart from delivering high data rates, future UMTS releases will also require to provide high network performance in terms of system capacity, low radiated power, and high coverage. Well promising performance-enhancing technologies are smart antennas as well as multiuser detection. Although these new radio technologies have recently been subject to intense research, main UMTS network integration aspects with their specific constraints have been neglected in many cases. Especially the interaction with UMTS radio resource control being required to meet Quality of Service (QoS) constraints has to be included to assess the applicability of these technologies for UMTS.</p><p style="line-height: 20px;"> In this paper, we study the interaction of beamforming concepts as well as multiuser detection with load and power control. We also work out UMTS specific constraints like signal-to-interference-plus-noise ratio (SINR) operating points, pilot power pollution or channel estimation, all strongly limiting network performance. Results are shown for capacity gains and power reduction for all beamforming concepts of interest as well as linear multiuser detection schemes. The results show that fix as well as user-specific beamforming significantly improves network performance gains in downlink. In uplink multiuser detection indicates fairly modest system capacity gains, while it reduces tremendously mobile station power.