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Sensors 2011, 11(4), 3852-3873; doi:10.3390/s110403852

An Enhanced Reservation-Based MAC Protocol for IEEE 802.15.4 Networks

1,* , 1
Received: 27 January 2011 / Revised: 24 March 2011 / Accepted: 28 March 2011 / Published: 30 March 2011
(This article belongs to the Section Physical Sensors)
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The IEEE 802.15.4 Medium Access Control (MAC) protocol is an enabling standard for wireless sensor networks. In order to support applications requiring dedicated bandwidth or bounded delay, it provides a reservation-based scheme named Guaranteed Time Slot (GTS). However, the GTS scheme presents some drawbacks, such as inefficient bandwidth utilization and support to a maximum of only seven devices. This paper presents eLPRT (enhanced Low Power Real Time), a new reservation-based MAC protocol that introduces several performance enhancing features in comparison to the GTS scheme. This MAC protocol builds on top of LPRT (Low Power Real Time) and includes various mechanisms designed to increase data transmission reliability against channel errors, improve bandwidth utilization and increase the number of supported devices. A motion capture system based on inertial and magnetic sensors has been used to validate the protocol. The effectiveness of the performance enhancements introduced by each of the new features is demonstrated through the provision of both simulation and experimental results.
Keywords: wireless sensor networks; medium access control; quality of service wireless sensor networks; medium access control; quality of service
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.

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Afonso, J.A.; Silva, H.D.; Macedo, P.; Rocha, L.A. An Enhanced Reservation-Based MAC Protocol for IEEE 802.15.4 Networks. Sensors 2011, 11, 3852-3873.

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