Radio Resource Management in 3G+ Systems
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Editorial Radio Resource Management in 3G+ Systems Alagan Anpalagan,1 Rath Vannithamby,2 Weihua Zhuang,3 and Sonia A¨ıssa4 1 Department
of Electrical and Computer Engineering, Ryerson University, Toronto, ON, Canada, M5B 2K3 Corporation, 2111 NE 25th Avenue, Hillsboro, OR 97229, USA 3 Department of Electrical and Computer Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1 4 INRS-EMT, Universit´ e du Qu´ebec, Place Bonaventure, 800 de la Gauchetiere Ouest, Suite 6900, Montreal, QC, Canada H5A 1K6 2 Intel
Received 9 July 2006; Accepted 9 July 2006 Copyright © 2006 Alagan Anpalagan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The 3G+ wireless systems can be characterized by aggregate bit rates in the range of Mbps, quality-of-service (QoS) support for interactive multimedia services, global mobility, service portability, enhanced ubiquity, and larger user capacity and coverage. All digital entirely packet-switched radio networks involving hybrid networking and access technologies are envisioned in 3G+ systems. In such systems, radio resource management (RRM) plays a major role in the provision of QoS and efficient utilization of scarce radio resources. With the required support for multimedia services to multiple users over diverse wireless networks and the ever-increasing demand for high-quality wireless services, the need for effective and efficient RRM techniques becomes more important than ever. The addition of efficient packet data channels in both forward and reverse directions and QoS support in 3G standards lead to a more flexible network, but at the same time increase the complexity of determining the optimal allocation of resources especially on the radio interface. This special issue is devoted to addressing the urgent and important need for efficient RRM techniques in the evolving next-generation wireless systems. This special issue consists of thirteen papers that have been selected following an extensive review process. Of those papers, two papers are on capacity prediction and outage analysis, two are on downlink power minimization algorithms, three are on rate scheduling based on real-time channel conditions, two are on multicast multimedia service delivery, three are on cross-layer design, and one is on vertical handoff mechanism. All of the papers are within the framework of the radio resource management and are summarized as follows.
In the first paper “Space-time water-filling for composite MIMO fading channels,” Shen et al. analyze the ergodic capacity and outage probability of the MIMO fading channel. The above capacity and probability with space-time waterfilling are evaluated through numerical integration which is simplified by the approximation of the eigenvalue distribution of the composite MIMO fading channel. The authors compare the performance of space-time water-filling with that
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