Date of Award

5-26-2015

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Systems Engineering

First Advisor

SESHADRI MOHAN

Abstract

In this thesis, we propose a novel game theoretic model to determine optimal pilot power for femtocells in a WCDMA heterogeneous network (HetNet) deployment. The proposed utility function takes proportional fairness into consideration in pilot power allocation of Femto APs and accepts Common Pilot Channel (CPICH) measurements of femtocell user equipment (FUE) with co-channel interference values as input parameters. We prove that the proposed game model is supermodular and converges to a Nash Equilibrium. Furthermore, since Femto APs are designed for indoor use, we propose an algorithm to regulate femtocell range by adjusting converged pilot transmit power in response to unwanted mobility events by passing users. Results indicate that our Distributed Power Control algorithm converges quickly and is sensitive to interference and load variations within the femtocells. Also, our proposed Unwanted Mobility Events algorithm further optimizes the converged Femto AP power to reduce core network signaling overhead caused by frequent handovers by passing users. In addition, we propose a load balancing algorithm through dynamic relocation of FAPs in a facility in a bid to enhance mobile user experience in such environment. Our results show improved load balancing between FAPs and also improved QoS in reallocated FUEs.

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