THESIS
2015
xv, 147 pages : illustrations ; 30 cm
Abstract
The growing demand for wireless communications poses great challenges for the current wireless
network infrastructure. The risk of spectrum crutch, where the user demand outstrips the available
spectrum, motivates the research on dynamic access to improve the usage of the under-utilized
spectrum. In addition, video streaming has dominated the wireless traffic, and it is important to
understand video Quality-of-Experience to efficiently improve video service quality over wireless
network.
In this thesis, we first study the spectrum management for dynamic spectrum access networks
from three aspects: spectrum auction, spectrum allocation between licensed and unlicensed use,
and hybrid access in femtocell networks. We identify the challenges under each scenario, and
propose solut...[
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The growing demand for wireless communications poses great challenges for the current wireless
network infrastructure. The risk of spectrum crutch, where the user demand outstrips the available
spectrum, motivates the research on dynamic access to improve the usage of the under-utilized
spectrum. In addition, video streaming has dominated the wireless traffic, and it is important to
understand video Quality-of-Experience to efficiently improve video service quality over wireless
network.
In this thesis, we first study the spectrum management for dynamic spectrum access networks
from three aspects: spectrum auction, spectrum allocation between licensed and unlicensed use,
and hybrid access in femtocell networks. We identify the challenges under each scenario, and
propose solutions to address the problem. Then, we conduct a measurement study to analyze video
Quality-of-Experience, represented by Quality-of-Engagement (QoE), in wireless network based
on a real-world data set.
For the spectrum auction, we propose two mechanisms. First, we design a double auction mechanism
for heterogeneous spectrums, dealing with the problem of heterogeneous interference graphs
and heterogeneous buyers’ valuations. Second, we design an online double auction mechanism for
dynamic spectrum access, taking into consideration the location-determined interference relationship
among buyers. For the spectrum allocation between licensed and unlicensed use, we build a
three-stage game model to characterize the interaction among the spectrum regulator, the licensed
and the unlicensed operators, and the end users. The target is a balance of allocation income for the spectrum regulator and social welfare for the end users. For the hybrid access in femtocell networks,
we establish a utility-aware refunding framework, in which the macrocell operator refunds
the femtocell owners for sharing their femtocell resources. All of the above studies achieve a more
efficient utilization of the spectrum resources in the dynamic spectrum access networks.
For the measurement study on video QoE over the wireless network, we deploy an experimental
platform to collect video session data and conduct a survey to solicit users’ subjective opinions. We
first analyze the influence of each factor on user QoE, then build a QoE prediction model based on
regression tree.
keywords: Wireless Network, Spectrum Management, Video Quality-of-Experience
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