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 |