Oregon State University

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PhD Final Oral Examination – Nessrine Chakchouk


Friday, September 7, 2012 3:00 PM - 5:00 PM

Resource Allocation Design for Next Generation Wireless Networks
The increased use of smartphones and other multimedia-capable mobile devices utilizing Internet applications, video calls and email is driving an unprecedented increase in worldwide wireless network traffic. This massive expansion of the wireless market along with the fast evolution of the wireless multimedia applications has brought about higher capacity, connectivity and Quality of Service (QoS) requirements that can no longer be satisfied with the pre-existing traditional networking paradigms. Next generation wireless networks (NGWNs) have recently emerged as a key solution to these issues by building heterogeneous networks. Achieving the required capacities, QoS at a lower cost in such networks is contingent upon multiple factors such as scheduling, interference management, transmission power control, etc. In this dissertation, we address the problem of resource allocation design in NGWNs, and we distinguish between two architectures: Next Generation Wireless backbone networks, namely Wireless Mesh Networks (WMNs) and Next Generation Wireless Access Networks, namely femtocell (FC) networks. WMNs were first introduced to foster the availability of Internet services (anywhere/anytime). However, capacity limitation presents a fundamental challenge to WMNs due mainly to the interference arising from the wireless nature of the environment as well as the scarcity of the radio/channel resources. To overcome this problem we first propose a scheduling scheme, that eliminates interference among the active links via a wise combination of time and frequency domains assigned to the wireless mesh routers. Our scheme is traffic aware in that it maximizes the capacity of these links with respect to their traffic loads, thus making them meet the end-to-end bandwidth requirements as much as possible. In the second part of this thesis, we direct our attention to an emerging type of next generation cellular/access networks, namely FC networks. FCs have appeared as a solution to improve the capacity and coverage of traditional macro cell (MC) networks, by providing high speed indoor coverage. However, the deployment of these spectrum-sharing licensed networks has brought about new interference problems at both the FCs and the underlying MC. Due to the autonomous nature of the FCs, their random deployment combined with the unreliable nature of the wireless medium; it is much more challenging to provide good performance in these wireless networks. Driven by this fact, in the second part of this thesis, we first design a fully-distributed estimation-based power allocation scheme that aims at fairly maximizing the capacity of FC networks. Second, we propose a novel distributed stochastic power control scheme that aims at sustaining the minimum required QoS at both tiers (i.e. FCs and MC). Finally, we develop a cross-layer UL performance analysis for power-controlled two-tier FC networks, in which we characterize the UL physical interference in FC networks and study its impact on the data-link layer QoS performances.

Major Advisor: Bechir Hamdaoui
Committee: Huaping Liu
Committee: Thinh Nguyen
Committee: Alan Wang
GCR: Oksana Ostroverkhova 


Kelley Engineering Center (campus map)
3114
Shannon Thompson
1 541 737 3617
shannon.thompson at oregonstate.edu
Sch Elect Engr/Comp Sci
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