Analytical Modelling for Quality of Service and Energy Efficiency of Small Scale Cellular Networks

In recent years, with the rapid increase in the number of mobile-connected devices and mobile data traffic, mobile operators have been trying to find solutions to provide better coverage and capacity along with higher Quality of Service (QoS). One promising solution in this regard is deployment of small cells such as femtocells. This thesis presents performability analysis of small cells in terms of various performance metrics like throughput, Mean Queue Length (MQL), Response Time (RT), and energy consumption. The model developed in this thesis considers mobility of the users, multiple channels (servers) for the small cells as well as failure and repair behavior of the channels (servers) since failure may also occur in the system. Numerical results are presented for the developed model by applying the spectral expansion solution approach for a typical scenario in smart-cities towards more green future Heterogeneous Network (HetNets). In this scenario a hybrid wireless cellular HetNet consisting of a macrocell and several small cells is considered as a case study in smart-cities. In this work, simulations are also accomplished to confirm the accuracy of the findings obtained from the numerical solution approaches.