Slotted ALOHA Random Access: Considering Priority, and Energy Efficiency

  • Author / Creator
    Rahimian, Samira
  • 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.

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  • Graduation date
  • Type of Item
  • Degree
    Master of Science
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    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.