Title :
Optimal Distributed Subchannel, Rate and Power Allocation Algorithm in OFDM-Based Two-Tier Femtocell Networks
Author :
Zhang, Jianmin ; Zhang, Zhaoyang ; Wu, Kedi ; Huang, Aiping
Author_Institution :
Inst. of Inf. & Commun. Eng., Zhejiang Univ., Hangzhou, China
Abstract :
In this paper, we address the problem of subchannel, rate and power allocation in OFDM-based two-tier femtocell networks, which comprise a conventional macrocell and multiple femtocells. Our objective is maximizing the multiple femtocell users´ weighted rate sum by jointly adjusting their subchannel, rate and power allocation, under the constraints of cross-tier interference (CTI) between macrocell and multiple femtocells. Then we propose an optimal distributed resource allocation algorithm based on Lagrangian dual method, and interpret it from economics angle. In order to illustrate the benefit of allowing femtocells to share the subchannels occupied by macrocell, we compare our system with another one (macrocell guard system), in which the femtocells can only use the subchannels unoccupied by macrocell. Simulation results validate the proposed algorithm, and show that our system can obtain better performance than the macrocell guard system.
Keywords :
OFDM modulation; cellular radio; channel allocation; interference suppression; Lagrangian dual method; OFDM; cross-tier interference; macrocell; optimal distributed resource allocation; optimal distributed subchannel allocation; power allocation; rate allocation; two-tier femtocell network; Base stations; Distributed algorithms; Femtocell networks; Lagrangian functions; Land mobile radio cellular systems; Macrocell networks; Mobile communication; Radiofrequency interference; Resource management; Signal to noise ratio;
Conference_Titel :
Vehicular Technology Conference (VTC 2010-Spring), 2010 IEEE 71st
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-2518-1
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2010.5493959