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    Directional Cell Breathing - A Framework for Congestion Control and Load Balancing in Broadband Wireless Networks

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    Date
    2009-04-27
    Author
    Ali, Khaled
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    Abstract
    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.
    URI for this record
    http://hdl.handle.net/1974/1813
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    • Queen's Graduate Theses and Dissertations
    • Department of Electrical and Computer Engineering Graduate Theses
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