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Basic Limits for LTE-Advanced Radio and HetNet Optimization in the Outdoor-to-indoor Scenario

Velez, F. J. ; Sousa, S. ; Mihovska, A. ; Prasad, R.

Basic Limits for LTE-Advanced Radio and HetNet Optimization in the Outdoor-to-indoor Scenario, Proc IEEE BlackSea Conference on Communications and Networking, Varna, Bulgaria, Vol. -, pp. - - -, June, 2016.

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Abstract
The unplanned deployment of small cells is leading to high levels of intra- and inter-tier interference. An insight on how to manage the interference is vital to reach a significant capacity improvement through ultra-dense networks. This paper considers heterogeneous networks with carrier aggregation, where the macro cells operate at 800 MHz to provide coverage and the small cells operate at 2.6 GHz to provide throughput enhancement at hotspots, including an outdoor-to-indoor scenario. We analyze in detail the values of the carrier-to-noise-plus-interference ratio (CNIR) from/at the user equipment (UE) for bandwidths of 10 and 20 MHz. A rapid decay is observed in the throughput for the small cells at a distance < 300m. Broader bandwidths allow for doubling the capacity only for R>dBP/rcc. For R>250m, the capacity is similar for reuse pattern, K=3 and 7, showing no advantages for higher K. A clear decrease of the supported throughput is verified for the highest coverage distances in non-line-of-sight propagation conditions. Besides, one concludes that outdoor-to-indoor coverage corresponds to slightly worst coverage with less interference.