Carrier Aggregation in Heterogeneous Cellular Networks

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Heterogeneous base stations (HetNets) and Carrier Aggregation (CA) are two distinct features of next-generation cellular networks. Small cells in HetNets are vital for data off-loading and can significantly improve area and cell edge spectral efficiency compared to using just macrocells. CA further increases the transmission bandwidth and thus network capacity by aggregating multiple component carriers on the physical layer. In this paper, the authors propose a tractable multi-band multi-tier model to study both multi-flow and single flow CA in HetNets, where base station positions in each tier follow an independent Poisson point process.