Abstract
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.
Graphical Abstract
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