This letter aims at providing a cell selection scheme to improve the system energy efficiency of small cell networks under both user equipment and backhaul link data rate constraints. The system energy efficiency optimization problem is formulated as a mixed integer linear fractional problem, which is NP-hard. To reduce the complexity, a stable sub-optimal solution named energy efficient cell selection (EECS) is proposed. The minimum achievable maximum system energy efficiency in EECS is proved to converge into the state that has no incentive to shut down or switch on more small cells. Simulation results indicate that shutting down as many as possible small cells is not always beneficial to system energy efficiency, and EECS is an effective scheme to improve the system energy efficiency.
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Nie et al. (2016) studied this question.
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