Evaluation on the impact of topological variation on energy efficiency in Zigbee networks.

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Masarira, Tafadzwa
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The University of Zambia
A Wireless sensor network (WSN) is a fast-developing technology which can monitor, calculate, and communicate wirelessly thereby finding it’s place in areas such as defence, home automation, medical care and environmental sciences which demands better security, throughput, energy efficiency and cost effectiveness. One of the leading WSN is Zigbee as it offers greater range than its counterparts of 10 – 100 metres with proven methods to extend, has low power consumption and can also connect to 64000 nodes which is far greater than its counterparts. The year 2020 saw an increase in the use of networks as governments all over the world enforced lockdowns to limit the movement of people in order to contain COVID 19 pandemic. There was tremendous increase in use of networks, and this resulted in more traffic or unprecedented use of networks. Thereby making it necessary to testing and validating the QoS i.e. throughput, packet loss, end to end delay. In previous research work, QoS has been of paramount importance. Growth in traffic and network size has shifted focus from QoS to energy efficiency and security. Therefore, key in this research is the need to improve energy efficiency. Different scenarios were simulated using different parameters. Topologies examined were star , tree and mesh. Focus was on QoS , Energy Efficiency and Security based on topological variation. QoS the focus was on throughput and data sent. MATLAB was then used to analyse results obtained from simulations. Performance evaluations show that the ZigBee can only be use for low-data rate and low-power smart grid applications not having very high reliability requirements and real-time deadlines. Star performed the best on small networks of ten (10) or less nodes. As the network get bigger i.e. more than 20 nodes tree and mesh perform better depending on parameters. This research analysed several QoS factors in different topologies. However, it is observed that decision on topology to implement should be based on the priorities of QoS and the three have different strengths and weaknesses. Mesh and Tree topologies perform well on energy efficiency depending on the parameters. Mesh is also very resilient when attacked as it proved to be secure. The researcher is confident that this work would benefit other researchers and/or ICT professionals in enhancing QoS , energy efficiency and security through topological variation of ZigBee networks.
Wireless sensor network. , Improving energy efficiency. , Wireless sensor network (WSN)--Zigbee. , Communication--Wireless.