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SIMULATION MODELS AND FRAMEWORK TO SUPPORT CONNECTION POINT SELECTION IN HWNS TO IMPROVE QOS/QOE, REDUCE COST AND INCREASE PROFITS

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Title: SIMULATION MODELS AND FRAMEWORK TO SUPPORT CONNECTION POINT SELECTION IN HWNS TO IMPROVE QOS/QOE, REDUCE COST AND INCREASE PROFITS
Author: Ernst, Jason
Department: School of Computer Science
Program: Computer Science
Advisor: Kremer, Stefan
Abstract: A heterogeneous wireless network (HWN) is made up from multiple radio access technologies (RATs) such as Bluetooth, Wi-Fi, and Long Term Evolution (LTE). The use of multiple RATs may allow for increased capacity, coverage, flexibility, reliability and increased spectral and energy efficiency. One of the most important challenges for the users and operators of HWNs is matching the quality of service (QoS) and quality of experience (QoE) requirements of the user with the particular RATs the operators offer. Furthermore, typical cellular operators have complicated service agreements between the users and other operators. The users wish to select the best network for the lowest cost, while operators wish to select users which maximize their profits. Traditionally, in homogeneous wireless networks such as Wi-Fi, the best access point (AP) is selected based on the strongest signal. This dissertation makes several contributions. First, an in-depth general survey of the state of the art in HWNs is presented, along with many of the current challenges and open research topics, with a particular focus on those which affect QoS and QoE. Next, focus is drawn to how networks are currently measured and optimized, which is typically with only a single metric. The limitations of this methodology are outlined. Since many potential networks involved in a HWN may potentially interfere with one another, such as Wi-Fi and Bluetooth, an experiment was performed to examine what the performance degradation may be in the case where a naı̈ve approach is taken and interference is not avoided between RATs operating in the same frequency range. Next, a module for simulating this behaviour in the NS3 simulation tool is presented. This is followed by an experiment which demonstrates the limitation of choosing an access point (AP) in a homogeneous network, which is a simple case of the more complex problem of RAT selection in heterogeneous networks. Finally, the challenges of selecting a RAT in a HWN are examined with two more simulation experiments which take into account selection criteria other than signal strength, along with the complex relationships between operators and the pricing schemes between operators and users.
URI: http://hdl.handle.net/10214/9494
Date: 2015
Rights: Attribution 2.5 Canada


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Attribution 2.5 Canada Except where otherwise noted, this item's license is described as Attribution 2.5 Canada