Despite the tremendous bandwidth increase in 3rd generation (3G) Broadband Wireless
Networks (BWNs) such as Universal Mobile Telecommunication System (UMTS),
maintaining the mobile users’ Quality of Service (QoS) requirements while maximizing
the network operators’ revenues is still a challenging issue. Moreover, spatial
distribution of network traffic has a negative impact on the overall network performance
where network resources are overutilized in parts of the network coverage area
while such resources are underutilized in other network coverage areas. Therefore,
network congestion and traffic imbalance become inevitable. Hence, efficient Radio
Resource Management (RRM) techniques which release congestion and balance
network traffic are of utmost need for the success of such wireless cellular systems.
Congestion control and load balancing in BWNs are, however, challenging tasks due
to the complexity of these systems and the multiple dimensions that need to be taken
into consideration. Examples of such issues include the diverse QoS requirements of
the supported multimedia services, the interference level in the system, which vary
the mobile users and base stations allocated transmission powers and transmission
rates to guarantee certain QoS levels during the lifetime of mobile users connections.
In this thesis, we address the problem of congestion control and load balancing
in BWNs and propose efficient network coverage adaptation solution in order to deal with these issues, and hence enhance the QoS support in these systems. Specifically,
we propose a directional coverage adaptation framework for BWNs. The framework
is designed to dynamically vary the coverage level of network cells to release system
congestion and balance traffic load by forcing mobile users handoff from a loaded
cell to its nearby lightly loaded cell. The framework consists of three related components,
namely directional coverage adaptation module, congestion control and load
balancing protocol, and QoS provisioning module. These components interact with
each other to release system congestion, balance network load, maximize network
resource utilization, while maintaining the required QoS parameters for individual
mobile users. / Thesis (Ph.D, Electrical & Computer Engineering) -- Queen's University, 2009-04-24 12:15:54.582
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:OKQ.1974/1813 |
| Date | 27 April 2009 |
| Creators | Ali, KHALED |
| Contributors | Queen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.)) |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English, English |
| Detected Language | English |
| Type | Thesis |
| Format | 2083895 bytes, application/pdf |
| Rights | This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner. |
| Relation | Canadian theses |
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