Abstract
The heterogeneous network (HetNet) deployed small cells technology to overcome the problems of holes "blind spots" coverage in 3G and 4G mobile networks. In this paper, we propose a hierarchical HetNet layout comprises of three layers, macro, metro and femto cells. The interplay between successive layers due to handover (HO) traffic is considered. Accordingly, the femto cell serves indoor traffic activity of femto users, while metro cell serves the outdoor traffic activities as well as the overflow traffic from femto cells. The highest layer in HetNet, macro cell only serves macro users and the overflowed traffic from the lower layer. Then, we develop a realistic teletraffic model in order to measure the performance of the proposed HetNet. The numerical results show the capability of HetNet with coexisting small cells to offload traffic from traditional macro cellular network in terms of reducing the blocking probability.