PhD ThesisThis thesis uniquely addresses challenges of bandwidth management in
cellular networks. The need for enhanced frequency assignment strategies
in Long term evolution (LTE) systems arises due to the limiting
e ects of intercell interference (ICI). In this study, the realistic scenario
of irregular network coverage patterns is considered, and in addition,
Heterogeneous cellular networks (HetNets). Firstly, extensive analysis
using simulations is presented for static frequency reuse (FR) techniques
in irregular Homogeneous (single-tier) cellular networks. Investigation
was carried out over several network positional and deployment layouts.
Second, a model is developed for irregular networks by de ning frameworks
for their location parameters and relationships, FR bandwidth and
power assignment, and the probability of interference in partitioned FR
schemes. A novel Geometric FR (GeoFRe) algorithm is then proposed
for single-tier networks with random BS placements. Third, an optimization
framework based on user fairness is proposed and implemented
for single-tier networks based on the concept of virtual UEs in di erent
BS regions. Finally, a framework for HetNets is presented where macro
and small BS deployments have imperfect coverage grid patterns. Performance
analysis is then carried out for two implementations of the Soft
FR (SFR) algorithm. Results from this research provide detailed analysis
on impact of BS irregularity on UE performance under FR schemes, a
simpli ed framework for modelling irregular macro BS, an improved FR
model, accurate computations for the area of irregular network coverage
patterns for intelligent bandwidth assignment, an optimization framework
to improve user fairness (and edge UE performance) in single-tier
networks and an FR model with performance analysis for irregular Het-
Nets.National Information Technology Development Agency (NITDA) and
Federal University of Technology Minna, both in Nigeria for o ering me
scholarship and support
