Background: The fast emerging Wireless Sensor Networks (WSNs) and its
growing demand in each and every sphere of our lives has shifted our focus on the performance
of the networks involved in varied fields. Recent studies depict that the performance
of network and its utilization can be enhanced by QoS (Quality of Service)
routing protocol. Thus, QoS is the essence of the WSNs. So, in this paper, we would
like to present a detailed survey of the various routing protocols which play a vital role
in attaining the QoS in WSNs. Methods: There are various levels of QoS which are required by the
WSNs depending on the applications that they focus upon. The QoS support to WSNs can be achieved
by various routing protocols. Thus, a detailed research on various routing protocols is done depicting
their strengths and weakness and a comparison table of various protocols on various parameters is provided.
Results: The QoS basically aims to focus on the quality that is perceived by the users of various
applications. The QoS facilitates the above aim in terms of delay, packet delivery ratio, reduction in
power of the sensor nodes, energy efficiency, bandwidth utilization, amount of through put generated
and many other factors. However, there are few challenges faced by QoS which may occur due to dynamic
topology and constrained resources. Even after these challenges the research suggests QoS is
undisputedly the essence of WSNs. Conclusion: The QoS is very advantageous as it helps in improving
the service provided to the users, and is accountable in improving the quality of output perceived by the
users of various applications. Researchers have started working to overcome the challenges of QoS with
the aim to minimize its constraints and maximize its multiple objectives.
Keywords: Delay, QoS, Quality, Reduction, Routing, Vital.
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