—In wireless broadband access networks, almost indoor environment encounters serious coverage problem due to non-line of sight transmission. To improve the coverage, femtocell has been introduced as a promising technology. However, the deployment of femtocells may introduce extra interference to macrocell base stations. An effective interference management mechanism is required to optimize the system performance. In this paper, a resource allocation algorithm is proposed to resolve the two-tier downlink interference problem. The proposed scheme combines fractional frequency reuse (FFR) in macrocell and a heuristic graph-based channel assignment algorithm in femtocell to reduce the interference problem. Simulation results reveal that the proposed approach significantly improves the system throughput of the two-tier OFDMA networks.
—Femtocells, interference management, resource allocation, Frational Frequence Reuse (FFR).
Gwo-Jong Yu and Hoai Nam Bui Khac are with the Department of Computer Science and Information Engineering, Aletheia University, New Taipei City, 251 Taiwan (e-mail: firstname.lastname@example.org, email@example.com).
Cite:Gwo-Jong Yu and Hoai Nam Bui Khac, "A Novel Downlink Interference Management Mechanism for Two-Tier OFDMA Femtocell Networks ," Journal of Advances in Computer Networks vol. 4, no. 2, pp. 80-85, 2016.