  In this paper, we conduct performance evaluation for Ultra-Dense Networks
(UDNs), and identify which modelling factors play major roles and minor roles.
From our study, we draw the following conclusions. First, there are 3
factors/models that have a major impact on the performance of UDNs, and they
should be considered when performing theoretical analyses: i) a multi-piece
path loss model with line-of-sight (LoS) and non-lineof- sight (NLoS)
transmissions; ii) a non-zero antenna height difference between base stations
(BSs) and user equipments (UEs); iii) a finite BS/UE density. Second, there are
4 factors/models that have a minor impact on the performance of UDNs, i.e.,
changing the results quantitatively but not qualitatively, and thus their
incorporation into theoretical analyses is less urgent: i) a general multi-path
fading model based on Rician fading; ii) a correlated shadow fading model; iii)
a BS density dependent transmission power; iv) a deterministic BS/user density.
Finally, there are 5 factors/models for future study: i) a BS vertical antenna
pattern; ii) multi-antenna and/or multi-BS joint transmissions; iii) a
proportional fair BS scheduler; iv) a non-uniform distribution of BSs; v) a
dynamic time division duplex (TDD) or full duplex (FD) network. Our conclusions
can guide researchers to downselect the assumptions in their theoretical
analyses, so as to avoid unnecessarily complicated results, while still
capturing the fundamentals of UDNs in a meaningful way.
