Femtocells in centralized systems: green operation and radio resource management techniques


In this paper, a system of femtocells controlled by a single controller is investigated. In such a scenario, femtocell access points (FAPs) are assumed connected via wired links to a central controller within a certain vicinity (e.g., building, compound, hotel, and campus.). Thus, radio resource management (RRM) and green network operation of LTE femtocell networks are investigated in an integrated wired/wireless system. Consequently, it becomes possible to perform RRM in a centralized and controlled way in order to enhance the quality of service (QoS) performance for the users in the network. Furthermore, energy-efficient operation consisting of switching off redundant FAPs can be implemented. A utility maximization framework is presented, and an RRM algorithm that can be used to maximize various utility functions is proposed. Another algorithm is presented for the scenario of FAP on/off switching to achieve green operation. It consists of selecting the best FAP to switch off, then moving the femto user equipments (FUEs) to other active FAPs without compromising their quality of service (QoS). Simulation results show that the proposed algorithms lead to significant performance gains.

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The author would like to thank the Editor and the Reviewers for their feedback and comments, which helped in increasing the clarity and quality of this paper.

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Correspondence to Elias Yaacoub.

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Part of this work was published in [1].

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Yaacoub, E. Femtocells in centralized systems: green operation and radio resource management techniques. Ann. Telecommun. 72, 679–691 (2017). https://doi.org/10.1007/s12243-017-0565-8

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  • Femtocell
  • Energy efficiency
  • Resource allocation
  • Interference mitigation
  • LTE