الفهرس 
THESIS INTRODUCTION AND METHODOLOGYOnly 14 pages are availabe for public view
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Abstract
Nowadays, Next Generation Networks (NGNs) have been candidate
as an appropriate methodology to improve the quality for a variety of
applications and services. In order that, the NGN will accommodate both of
the concurrent technologies and broadband services, this type of integrated
traffic in different Radio Access Technologies (RATs) is commonly
addressed as Heterogeneous Wireless Networks (HWNs). Therefore, the
current thesis investigates the R§:.dioResource Management (RRM) and its
deployment scenarios in such HWNs.
Also, in this thesis, different architectures of HWNs are reviewed as
well as the heterogeneity phenomena. Possible proposed architectures for
such HWNs are mentioned and the main challenges facing HWNs are
briefly discussed. Previous research studies have highlighted the RRM and
its relation for optimal resources utilization. Several RRM techniques are
outlined. One such important RRM technique is Call Admission Control
(CAC). Call admission control plays a great role in such Quality of Service
(QoS) provisioning and cost effectiveness. The thesis offers a survey
covering different types of CACs and the different techniques employed in
each of them.
The Guard Channel (GC) call admission control scheme has been
widely deployed especially, bandwidth allocation for voice and data
integration in HWN. A bandwidth allocation scheme called Multi-threshold
reservation scheme, which is a natural extension from GC scheme, is
proposed. A complete sharing system with multiple thresholds based on the
GC policy is modeled by two-dimensional Markov process to evaluate the
system performance. The model is then used to investigate the optimal
number of guard channels required in wireless networks such that the total
cost function and blocking probabilities of new voice calls, new data
sessions, handoff voice calls and hand off data sessions meet their
corresponding QoS requirements.
Then, in order to achieve a seamless integration between different
RATs, Common Radio Resource Management (CRRM) algorithms are
considered to be deployed in such HWN. The allocation of voice and data
services in both of GSMIEDGE Radio Access Network (GERAN)/ UMTS
Terrestrial Radio Access Network (UTRAN) systems is considered using
multi-dimensional Markov modeIn this thesis, analytical and numerical methods are used to
characterize the performance of HWN cellular networks based on the voice
call and data sessions level. In addition, the effect of multi-threshold
bandwidth reservation scheme, handoff guard channel, call intensity, and
the handoff ratio are presented. A perfect power control scheme is assumed
and HWN handofftypes (both of horizontal and vertical) are considered.
In the presented work, blocking probability as well as forced
termination probability, and utilization are investigated as performance
metrics for both of new and handoffvoice calls and data sessions.
The presented model is concerning with the case of integrated RATs
with different traffic types (voice/data). Cell size and handoff strategies are
considered with the effect of multi-threshold bandwidth reservation
scheme. A detailed derivation for the state probabilities of the presented
birth-death process is considered. Performance parameters are also derived
for both of each traffic type