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A Subchannel Allocation Algorithm for Femtocells in OFDMA Cellular Systems  

Kwon, Jeong-Ahn (연세대학교 전기전자공학과 통신망 연구실)
Kim, Byung-Gook (연세대학교 전기전자공학과 통신망 연구실)
Lee, Jang-Won (연세대학교 전기전자공학과 통신망 연구실)
Lim, Jae-Won (LG전자)
Kim, Byoung-Hoon (LG전자)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.35, no.4A, 2010 , pp. 350-359 More about this Journal
Abstract
In this paper, we provide a subchannel allocation algorithm for a femtocell system with OFDMA. This algorithm aims to maximize the minimum number of allocated subchannels among all femtocells and in addition, to maximize the total usage of subchannels in all femtocells. The subchannel allocation algorithm consists of three steps: constructing an interference graph, coloring algorithm, and mapping subchannels to colors. In the first step, the femtocell system is modelled by an interference graph, in which each femtocell is modeled as a node and two nodes that interfere with each other are connected by an edge. Based on this interference graph, by using a coloring scheme and mapping subchannels to each color, we can allocate subchannels to each femtocell. Finally, the performance of this algorithm is provided by simulation.
Keywords
OFDMA; Femtocell; Dedicated Channel; Coloring;
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