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In this paper, the authors assess how coordination among base stations can be exploited to improve downlink capacity in Fourth Generation (4G) cellular networks. They focus on heterogeneous networks where low-power pico cells are deployed within the coverage area of an existing macro network with the aim of offloading traffic from the (potentially congested) macro cells to low-power cells. Firstly, they describe an enhanced inter-cell interference coordination scheme, which is shown to achieve a significant capacity gain in such deployments by leveraging a loose coordination among neighbor base stations. Secondly, they explore how a tighter coordination among base stations can be exploited to further improve the network capacity.
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