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Mathematical Problems in Engineering
Volume 2014, Article ID 836524, 13 pages
http://dx.doi.org/10.1155/2014/836524
Research Article

Reactive GTS Allocation Protocol for Sporadic Events Using the IEEE 802.15.4

Department of Computer Science, COMSATS Institute of Information Technology, Islamabad 22000, Pakistan

Received 27 March 2014; Accepted 24 June 2014; Published 3 August 2014

Academic Editor: Anand Paul

Copyright © 2014 Mukhtar Azeem et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Wireless sensor networks (WSNs) find applications in the industrial automation where periodic and sporadic events occur. The combined propagation of information generated by periodic and sporadic events from a sensor node to an actuator node is challenging due to random nature of sporadic events, particularly, if the deadlines are hard. The IEEE 802.15.4 standard provides the basis for a real-time communication mechanism between neighboring nodes of the WSN at the media access control layer. However, the standard does not address such communications over multiple hops. To support the industrial applications with such requirements, this work proposes a novel online control protocol that exploits the basis provided by the IEEE 802.15.4 standard. The proposed control protocol ensures that a given offline sporadic schedule can be adapted online in a timely manner such that the static periodic schedule has not been disturbed and the IEEE 802.15.4 standard compliance remains intact. The proposed protocol is simulated in OPNET. The simulation results are analyzed and presented in this paper to prove the correctness of the proposed protocol regarding the efficient real-time sporadic event delivery along with the periodic event propagation.