06658932.pdf - 2378 IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY VOL 63 NO 5 JUNE 2014 Cluster-Based Resource Management in OFDMA Femtocell Networks With


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2378 IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 63, NO. 5, JUNE 2014 Cluster-Based Resource Management in OFDMA Femtocell Networks With QoS Guarantees Abbas Hatoum, Rami Langar, Member, IEEE , Nadjib Aitsaadi, Member, IEEE , Raouf Boutaba, Fellow, IEEE , and Guy Pujolle, Senior Member, IEEE Abstract —Recently, operators have resorted to femtocell net- works to enhance indoor coverage and increase system capac- ity. Nevertheless, to successfully deploy such solution, efficient resource-allocation algorithms and interference mitigation tech- niques should be deployed. The new applications delivered by operators require large amounts of network bandwidth. Although, some customers may want to pay more in exchange for a better quality of service (QoS), some others need fewer resources and can be charged accordingly. Hence, we consider an orthogonal frequency-division multiple-access (OFDMA) femtocell network serving both QoS-constrained high-priority (HP) and best-effort (BE) users. Our objective is to satisfy a maximum number of HP users while serving BE users as well as possible. This mul- tiobjective optimization problem is NP-hard. For this aim, we propose in this paper a new resource-allocation and admission control algorithm, which is called QoS-based femtocell resource allocation (Q-FCRA), based on clustering and taking into ac- count QoS requirements. We show through extensive network simulations that our proposal outperforms two state-of-the-art schemes [centralized-dynamic frequency planning (C-DFP) and distributed random access (DRA)] and our previous proposal, i.e., femtocell resource allocation (FCRA), in both low- and high- density networks. The results concern the throughput satisfaction rate, spectrum spatial reuse, the rate of rejected users, fairness, and computation and convergence time. Index Terms —Clustering, femtocells, orthogonal frequency- division multiple access (OFDMA), performance evaluation, quality-of-service (QoS) support, resource allocation. I. I NTRODUCTION F EMTOCELLS have recently appeared as a viable solu- tion to enable broadband connectivity in mobile cellular networks. Instead of redimensioning macrocells at the base station level, the modular installation of short-range access Manuscript received September 21, 2012; revised February 18, 2013, May 24, 2013, and September 18, 2013; accepted October 8, 2013. Date of publication November 8, 2013; date of current version June 12, 2014. This paper was presented in part at the IEEE International Conference on Communications, Ottawa, ON, Canada, June 10–15, 2012 [1]. The review of this paper was coordinated by Prof. Y. Qian. A. Hatoum, R. Langar, and G. Pujolle are with the Laboratoire d’informatique de Paris 6 (LIP6), University of Pierre and Marie Curie, Paris 75005, France (e-mail: [email protected]; [email protected]; guy.
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