What will interference be like in 5G HetNets?

In this paper we discuss challenges in interference modeling for performance analysis of future wireless networks. We show through detailed numerical and simulation case studies as well as through measurements that many of the commonly used models result in potentially highly inaccurate predictions of interference and performance. In particular, we identify correlations in node locations, three-dimensional structure of future network deployments, and complexity of in-building and inter-building radio propagation as key domains where further research is needed. We also discuss in detail potential approaches to be taken as starting points for new research in these domains.