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Slotted ALOHA Random Access: Considering Priority, and Energy Efficiency Open Access


Other title
Energy Efficiency
ALOHA Random Access
Type of item
Degree grantor
University of Alberta
Author or creator
Rahimian, Samira
Supervisor and department
Ardakani, Masoud (Electrical and Computer Engineering)
Examining committee member and department
Khabbazian, Majid (Electrical and Computer Engineering)
Tellambura, Chintha (Electrical and Computer Engineering)
Department of Electrical and Computer Engineering
Date accepted
Graduation date
Master of Science
Degree level
ALOHA is a random medium access control (MAC) protocol, designed over 50 years ago. Due to its widespread applications in wireless Machine-to-Machine (M2M) communications, and also deployment of recently developed ideas borrowed from coding theory, ALOHA has recently attracted lots of attention. As a result, different versions of ALOHA that have significantly improved the scheme throughput compared to the original ALOHA have been recently created. This thesis focuses on two of the recent versions of ALOHA protocol. In the first part of our contributions in this thesis, we study the achievable throughput region for a network consisting of more than 1 class of users with different priority, and desire for throughput achievement. Considering framed slotted ALOHA with irregular repetition and successive interference cancellation (SIC), we find the best possible throughput region, and we also show how to achieve this region. We achieve this throughput region by selectively turning users of different groups on and off, based on their desired sets of throughputs. In the second part of this thesis, we investigate several modifications on a recently proposed ALOHA random access protocol, namely frameless slotted ALOHA random access. Frameless slotted ALOHA random access protocol has been able to achieve the highest throughput among all the slotted ALOHA schemes. In frameless slotted ALOHA each user independently accesses the wireless medium and all users have the same probability of access. In this work, we propose two adaptive access techniques that will help reduce the energy consumption of wireless communication networks of relatively small size [25-200] without loss of throughput. The amount of reduction in the energy consumption depends on the number of users in the network.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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