A New Association Scheme for Handling Node Mobility in Cluster-Tree Wireless Sensor Networks
1
Department of Computer Science, University of the Far South of Santa Catarina, 88806-000 Criciúma, Brazil
2
Department of Automation and Systems, Federal University of Santa Catarina, 88040-900 Florianópolis, Brazil
3
Department of Computing, Federal University of Santa Catarina, 88905-120 Araranguá, Brazil
4
INEGI, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
5
Department of Computing, Federal University of Piauí, 64049-550 Teresina, Brazil
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(19), 5694; https://doi.org/10.3390/s20195694
Received: 3 September 2020
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Revised: 28 September 2020
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Accepted: 1 October 2020
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Published: 6 October 2020
(This article belongs to the Special Issue Sensor Applications in Industrial Automation)
Node mobility in multi-hop communication environments is an important feature of Wireless Sensor Network (WSN)-based monitoring systems. It allows nodes to have freedom of movement, without being restricted to a single-hop communication range. In IEEE 802.15.4 WSNs, nodes are only able to transfer data messages after completing a connection with a coordinator through an association mechanism. Within this context, a handover procedure needs to be executed by a mobile node whenever there is a disconnection from a coordinator and the establishment of a connection to another one. Many applications, such as those found in health monitoring systems, strongly need support for node mobility without loss of data during the handover. However, it has been observed that the time required to execute the handover procedure is one of the main reasons why IEEE 802.15.4 cannot fully support mobility. This paper proposes an improvement to this procedure using a set of combined strategies, such as anticipation of both the handover mechanism and the scan phase enhancement. Simulations show that it is possible to reduce latency during the association and re-association processes, making it feasible to develop WSN-based distributed monitoring systems with mobile nodes and stringent time constraints.
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Keywords:
IEEE 802.15.4; handover; node-mobility; health monitoring; cluster-tree
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MDPI and ACS Style
Casagrande, R.; Moraes, R.; Montez, C.; Vasques, F.; Leão, E. A New Association Scheme for Handling Node Mobility in Cluster-Tree Wireless Sensor Networks. Sensors 2020, 20, 5694. https://doi.org/10.3390/s20195694
AMA Style
Casagrande R, Moraes R, Montez C, Vasques F, Leão E. A New Association Scheme for Handling Node Mobility in Cluster-Tree Wireless Sensor Networks. Sensors. 2020; 20(19):5694. https://doi.org/10.3390/s20195694
Chicago/Turabian StyleCasagrande, Rogério, Ricardo Moraes, Carlos Montez, Francisco Vasques, and Erico Leão. 2020. "A New Association Scheme for Handling Node Mobility in Cluster-Tree Wireless Sensor Networks" Sensors 20, no. 19: 5694. https://doi.org/10.3390/s20195694
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