The document discusses advancements in LTE technology, particularly LTE-Advanced, which introduces features like carrier aggregation and enhanced support for MIMO to improve energy efficiency in wireless access networks. It highlights the significance of base station types, noting that macrocell stations tend to be more energy efficient at higher bit rates compared to femtocell stations. The conclusion emphasizes the improvements in energy efficiency, with carrier aggregation and MIMO enhancing performance significantly when implemented in networks.
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