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DecTDMA: A Decentralized-TDMA with Link Quality Estimation for WSNs

Olaf Landsiedel (Institutionen för data- och informationsteknik, Nätverk och system (Chalmers) ) ; Thomas Petig (Institutionen för data- och informationsteknik, Nätverk och system (Chalmers) ) ; Elad Michael Schiller (Institutionen för data- och informationsteknik, Nätverk och system (Chalmers) )
18th International Symposium, SSS 2016, Lyon, France, November 7-10, 2016, Proceedings p. 231-247. (2016)
[Konferensbidrag, refereegranskat]

In wireless sensor networks (WSNs), different motes may transmit packets concurrently, i.e., having overlapping transmission pe- riods. As a result of this contention, there are no packet reception guar- antees and significant bandwidth can be lost. This contention can have a strong impact on the performance together with other kinds of interfer- ence sources, e.g., ambient noise. As a result, WSN’s connectivity tends to have a very dynamic nature. In this paper, we devise DecTDMA (Decentralized-TDMA), a fully de- centralized medium access controller (MAC) that significantly reduces contention. It is based on a self-stabilizing algorithm for time division multiple access (TDMA). This self-stabilizing TDMA algorithm uses no external assistance or external references, such as wireless access points (WAPs) and globally-synchronized clocks. We present the design and implementation of DecTDMA and report encouraging results: our Cooja simulations and Indriya testbed experiments show stable connectivity and high medium utilization in both single and multi-hop networks. Since DecTDMA has favorable characteristics with respect to connection sta- bility, we show that common link quality estimation (LQE) techniques further improve the operation of DecTDMA in the dynamic environment of low-power wireless networks.

Nyckelord: Wireless Sensor Networks, WSN,

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Denna post skapades 2016-11-28. Senast ändrad 2017-01-16.
CPL Pubid: 245695


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