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In order to cope with the expected future growth of mobile broadband traffic, network operators will be forced to dramatically increase their Radio Access Network (RAN) capacities. As neither the purchase of additional spectrum nor the deployment of new radio technologies will be able to solve this problem in the long run, the authors focus on a strategy for offloading the macro-infrastructure by introducing small cell sites of high spatial density (e.g., femto-cells) or by shifting significant volumes of traffic towards connections operating in the unlicensed bands (e.g., IEEE 802.11 Wi-Fi). In this paper, they address related coverage and interference issues, based on a recent measurement campaign conducted in a representative district of the city of Vienna, Austria.
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