Increased coverage and operating capacity are sorely needed if future cellular networks are to provide adequate service. With more than one billion mobile-broadband users worldwide, heterogeneous-network (HetNet) technology is progressing rapidly to meet that goal. HetNet will provide substantial numbers of macro-networks and a large number of small cells, including femtocells. In the past, large cells encountered problems when they handled large numbers of users, which reduced the operating capacity per customer....
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