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e are back this month with a sequel to our May 2013 Feature Topic on heterogeneous and small cell networks (Het- SNets). In this follow-up, we have six more articles that address cognitive radio, moving cells, WiFi offloading, and energy efficiency aspects of HetSNets. The first article, by Song et al., provides a holistic view of hyper-dense HetSNet deployments by comparing massive antenna and dense...
In a typical macrocell network, all macrocell mobile stations (mMSs) are synchronized to the macrocell base station (mBS) during the uplink. The mMSs that are closer to the mBS transmit their signals at a later time instant so that signals of all the all mMSs arrive at the mBS at the same time. However, signals of the mMSs reach at the femtocell base stations (fBSs) with different delays, which may...
Femtocell networks have the potential of significantly improving the capacity of next-generation cellular systems. However, interference to/from the macrocell network is a critical problem affecting the capacity. Co-channel operation with closed-subscriber group (CSG) access offers a large bandwidth to be shared by the users of the femtocell network; however, it also introduces significant interference...
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