標題: Downlink Optimization and Performance of Relay-Assisted Cellular Networks in Multicell Environments
作者: Sheen, Wern-Ho
Lin, Shiang-Jiun
Huang, Chia-Chi
電信工程研究所
Institute of Communications Engineering
關鍵字: Downlink performance;genetic algorithm (GA)-based optimization;relay-assisted cellular system
公開日期: 1-六月-2010
摘要: Deploying fixed relay stations (RSs) in traditional mobile cellular networks is widely recognized as a promising technology to improve cell coverage, user throughput, and system capacity, to save the transmit power of a mobile station (MS) in the uplink, and to provide a low-cost deployment for coverage extension. One crucial step toward developing such a relay-assisted cellular network is to fully evaluate its performance from both theoretical and practical viewpoints. In the literature, however, the system has only been evaluated for very limited system configurations: with a fixed number of RSs and locations and/or a fixed frequency-reuse pattern. This paper aims to investigate the downlink performance limits of a general relay-assisted network with optimized system parameters in a multicell environment. A genetic algorithm (GA) is proposed for the joint optimization of system parameters, including the number of RSs and their locations, frequency-reuse pattern, path selection, and resource allocation to maximize the system spectral efficiency (SE). Two types of quality of end-user experience (QoE), i.e., 1) fixed-bandwidth allocation (FBA) and 2) fixed-throughput allocation (FTA), are investigated along with two path-selection methods, i.e., 1) SE based and 2) signal-to-interference-plus-noise ratio (SINR) based. Numerical results show that significant improvement on system performance can be achieved with the optimized system parameters.
URI: http://dx.doi.org/10.1109/TVT.2010.2042739
http://hdl.handle.net/11536/5292
ISSN: 0018-9545
DOI: 10.1109/TVT.2010.2042739
期刊: IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Volume: 59
Issue: 5
起始頁: 2529
結束頁: 2542
顯示於類別:期刊論文


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