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Interference modelling for soft frequency reuse in irregular heterogeneous cellular networks

机译：不规则异构蜂窝网络中软频率复用的干扰建模

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摘要

Soft frequency reuse (SFR) has been proposed as a technique to address the problem of intercell interference (ICI) in cellular networks. A major challenge facing SFR implementation is the efficient allocation of scarce base station (BS) resources like bandwidth and power. This challenge further motivates the need for accurate network modelling, a requirement for optimal SFR algorithms. Particularly, the modelling and optimization of SFR in complex Heterogeneous cellular networks (HetNets) is a current problem in academia and the industry. In this paper, we present a new interference model for HetNets which considers the probabilistic nature of ICI in SFR. The interference probabilities from different BS tiers to the various user (UE) classes are computed. In combination with the analysis of macro BS transmit powers and distance relationships, new equations are also derived for UE signal-to-interference-ratio (SINR) and capacity. A detailed performance analysis is then presented for cases of both Hexagonal and Irregular macro BS placements. Our results show how macro and pico UE perform with respect to the BS power ratios, edge frequencies and placement of BS. This provides useful insights into the development of optimal SFR techniques for HetNets.
机译：已经提出软频率复用（SFR）作为解决蜂窝网络中的小区间干扰（ICI）问题的技术。 SFR实施面临的主要挑战是有效分配带宽和功率等稀缺基站（BS）资源。这一挑战进一步激发了对精确网络建模的需求，这是最佳SFR算法的要求。尤其是，复杂异构蜂窝网络（HetNets）中SFR的建模和优化是学术界和行业中的当前问题。在本文中，我们提出了一种针对HetNets的新干扰模型，该模型考虑了SFR中ICI的概率性质。计算从不同的BS层到各种用户（UE）类别的干扰概率。结合对宏BS发射功率和距离关系的分析，还可以得出关于UE信号干扰比（SINR）和容量的新公式。然后针对六角形和不规则宏BS放置的情况提供了详细的性能分析。我们的结果表明，宏和微微UE在BS功率比，边缘频率和BS位置方面的性能如何。这为开发适用于HetNets的最佳SFR技术提供了有用的见识。

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