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Heterogeneous networks (HetNets) have been considered as a promising technique for improving spectral efficiency, but the energy efficiency influenced by the fluctuation of user numbers should not be neglected to achieve green communications. We introduce the energy-efficient switch-off mode algorithm for pico cells to reduce power consumption in the self-organizing network (SON). Once the switch-off...
Cost is an important factor in anti-air missile system reliability allocation. Reliability and cost mathematical relation model is established in this paper, ant colony algorithm is used to solve the optimization problem. This article also offers an optimum plan, which is calculated by use of some practical examples, and the results show that ant colony algorithm is effective to deal with reliability...
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