Simplified and accurate analytic model for interference analysis in cellular networks

We propose a simple, yet accurate, interference prediction model using the widely used two-ring hexagonal network layout in the absence or presence of shadowing. The proposed model only considers two dominant interferers out of the 18 ones that surround the serving base station. The proposed model, in contrast to the fluid model, takes the radial direction into account. This makes our proposed model more accurate than the fluid model as is validated by computer simulations. Using the proposed model, the conditional probability of outage in the presence of shadowing is derived and its accuracy is shown to be within a fraction of a dB for most scenarios and no worse than 2 dB for few exceptional ones. The analysis presented in this paper gives useful insight with respect to the role played by interference in cellular networks.