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Advisor(s)
Abstract(s)
The Internet of Things (IoT) has emerged as a paradigm over the last few years as a result of
the tight integration of the computing and the physical world. The requirement of remote
sensing makes low-power wireless sensor networks one of the key enabling technologies
of IoT. These networks encompass several challenges, especially in communication and
networking, due to their inherent constraints of low-power features, deployment in harsh
and lossy environments, and limited computing and storage resources. The IPv6 Routing
Protocol for Low Power and Lossy Networks (RPL) [1] was proposed by the IETF ROLL
(Routing Over Low-power Lossy links) working group and is currently adopted as an
IETF standard in the RFC 6550 since March 2012. Although RPL greatly satisfied the
requirements of low-power and lossy sensor networks, several issues remain open for
improvement and specification, in particular with respect to Quality of Service (QoS) guarantees and support for mobility.
In this paper, we focus mainly on the RPL routing protocol. We propose some enhancements to the standard specification in order to provide QoS guarantees for static as well as
mobile LLNs. For this purpose, we propose OF-FL (Objective Function based on Fuzzy Logic),
a new objective function that overcomes the limitations of the standardized objective functions that were designed for RPL by considering important link and node metrics, namely
end-to-end delay, number of hops, ETX (Expected transmission count) and LQL (Link
Quality Level). In addition, we present the design of Co-RPL, an extension to RPL based
on the corona mechanism that supports mobility in order to overcome the problem of slow
reactivity to frequent topology changes and thus providing a better quality of service
mainly in dynamic networks application. Performance evaluation results show that both
OF-FL and Co-RPL allow a great improvement when compared to the standard specification, mainly in terms of packet loss ratio and average network latency.
2015 Elsevier B.V. Al
Description
Keywords
LLNs RPL QoS Objective function Mobility
Citation
Publisher
Elsevier