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Title: Adaptive receiver-based preamble-sampling MAC protocol for low power and lossy wireless sensor networks
Author: Akhavan, Mohammad Reza
ISNI:       0000 0004 5368 1858
Awarding Body: King's College London
Current Institution: King's College London (University of London)
Date of Award: 2014
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Low-power and lossy Wireless Sensor Networks (WSNs) consist of a large number of resource constrained sensors nodes communicating over a lossy wireless channel. The key design criteria in low-power and lossy WSNs are energy-efficiency and reliability of data delivery. Sensors are low-cost, battery-powered electronic devices with limited computational and communication capabilities. They are prone to failure due to energy depletion, hardware malfunction, etc. This causes links to create or break and hence the connectivity graph to change. In addition, path loss, shadowing and multipath fading make the links unstable. The main energy savings in sensors can be achieved by keeping the radio in sleep mode for maximum possible duration. The Medium Access Control (MAC) protocol is responsible for controlling the status of the radio; its behaviour consequently affects the energy-efficiency of the sensors. In this work a set of energy-efficient and reliable communication mechanisms for low-power and lossy WSNs are proposed. It can also be applicable for Internet of Things (IoT) and Machine-to-Machine (M2M) systems. The contributions of this thesis are: We propose a Receiver-Based MAC (RB-MAC) which is a preamble-sampling protocol that dynamically elects the next receiver among potential neighbours, based on current channel conditions. The proposed scheme is resilient to lossy links, and hence reduces the number of retransmissions. We show by analysis, simulation, and practical implementation how it outperforms the state-of-the-art sender-based MAC protocols in terms of energy-efficiency, delay and reliability. We introduce two extensions of RB-MAC: adaptive preamble MAC (ap-MAC) and adaptive sampling MAC (as-MAC) protocols. We demonstrate through analytical and simulation that the proposed extensions improve the end-to-end energy efficiency and delay while maintaining comparable reliability of data delivery. We apply RB-MAC to IETF ROLL’s RPL routing protocol [RFC6550] to study the multi-hop performance of RB-MAC. The analytical and simulation-based results show significant improvement in energy-efficiency, delay and reliability against sender-based MAC.
Supervisor: Aghvami, Abdol-Hamid ; Friderikos, Vasilis Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available