Nowadays, the network traffic has increased
exponentially due to amount of information and number
of users which are connected to Heterogeneous Networks
(HetNets) in this case we focus on LTE-WiFi
technologies. This is an important issue that need to solve
for an efficient network communication process end to
end. The aim of this article is to present the-state-of-theart about performance models for LTE-WiFi HetNets and
a classification of key performance metrics which help to
analyze HetNets behaviour. The article concludes with a
methodology that will be applied later for this research
problem, as well as opened research questions. We
believe, that apply our methodology using accurate and
suitable models in HetNets the transmission process will
have a fairness traffic when both networks coexist.
Spatial Concentration of Caching in Wireless Heterogeneous Networks