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For satisfying rapidly increasing data rates at hotspots and enhancing coverage in buildings, small cells, such as femtocells, picocells, and microcells, are deployed in LTE-A. Femtocells are typically installed at hotspots and overlay with the macrocell to improve energy efficiency and data rates. In macro-femto HetNets, the handover issue is more important than that in macrocell networks. On one...
Radio spectrum underutilization and energy inefficiency become urgent bottleneck problems to the sustainable development of wireless technologies. The research philosophies of wireless communications have been shifted from balancing reliability-efficiency tradeoff in the link level to seeking spectrum-energy efficiency in the network level. Global spectrum-energy efficient designs attract significant...
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