MAC specifications for a WPAN allowing both energy saving and guaranteed delay
Industrials have been increasingly interested in sensor and actuator networks to monitor and control installations. The recent IEEE 802.15.4 standard has been developed to address vital issues of these networks, such as limited battery power and low processing capabilities. However, the standard does not meet all the requirements of industrial networks. For example, only some of the IEEE 802.15.4 nodes save en-ergy, and the delay for the computer running the monitoring application to retrieve the sensor data or to activate an actuator is not bounded. Our research on energy-efficient MAC protocol is divided into two parts: Part A is the proposal of a flexible, synchronized tree-based MAC pro-tocol called MaCARI and Part B deals with optimizations that can be performed within each cell.
This paper focuses on Part A, that is, on the description of the MaCARI protocol. MaCARI is designed to tolerate scheduled activities such as sensor data retrieval and unscheduled activities such as complex rout-ing. MaCARI achieves this flexibility by using a tree-based centralized mechanism. We show the benefits of MaCARI by ensuring all nodes sleep regularly and by proving that the maximum end-to-end delay is bounded.
Keywordswireless sensor networks IEEE 802.15.4 tree-based synchro-nization energy efficient MAC
- 1.Halkes, G.P., Van Dam, T., Langendoen, K.G.: Comparing energy-saving MAC protocols for wireless sensor networks. Mobile Networks and Applications (10) (2005) 783–791Google Scholar
- 2.IEEE 802.15: Part 15.4: Wireless medium access control (MAC) and physical layer (PHY) specifications for low-rate wireless personal area networks (WPANs). Standard 802.15.4 R2006, ANSI/IEEE (2006)Google Scholar
- 3.The OCARI project: The ocari project web site http://ocari.lri.fr.Google Scholar
- 4.Livolant, E., Van den Bossche, A., Val, T.: MAC specifications for a WPAN allowing both energy saving and guaranteed delay - Part B: Optimisation of the intra-star exchanges for MaCARI. In: Submitted to WSAN 2008Google Scholar
- 5.IEEE 802.15 Task Group 4b: TG4b contributions http://grouper.ieee.org/groups/802/15/pub/TG4b.html.Google Scholar
- 6.Cunha, A., Alves, M., Koubaa, A.: Implementation details of the time division beacon scheduling approach for ZigBee cluster-tree networks. Technical Report TR-070102, Polytechnic Institute of Porto (November 2007)Google Scholar
- 7.Koubaa, A., Cunha, A., Alves, M.: A time division beacon scheduling mechanism for IEEE 802.15.4/Zigbee cluster-tree wireless sensor networks. Technical Report TR-070401, Polytechnic Institute of Porto (April 2007)Google Scholar
- 8.Elson, J., Girod, L., Estrin, D.: Fine-grained network time synchronization using reference broadcasts. In: Symposium on Operating Systems Design and Implemen-tation (OSDI). (December 2002)Google Scholar
- 9.Freescale: Zigbee / IEEE 802.15.4 Freescale solution. Technology General Infor-mation, Freescale Semiconductor (2004)Google Scholar