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Sensors 2011, 11(5), 5229-5252; doi:10.3390/s110505229
Article

Retrieval of the Extreme Values under Deadline Constraints in Wireless Sensor Networks

1,* , 1
, 2
 and 3
Received: 20 April 2011 / Revised: 2 May 2011 / Accepted: 11 May 2011 / Published: 12 May 2011
(This article belongs to the Section Physical Sensors)
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Abstract

We consider a problem of retrieving the extreme value among sensed data under deadline constraints in wireless sensor networks with potential applications to alarm systems. The sensed data is mapped to a score which we adopt as a unified measure of the relative urgency of the data. The objective is to retrieve the data with the maximum score. We propose fully distributed schemes for contention based medium access and data combining. The proposed medium access scheme uses a randomized back-off which is controlled based on the score of the data to be transmitted. Data combining techniques are proposed to further suppress unnecessary traffic and reduce contention. The key observation is that one should aggressively prioritize packets with high score, up to an extent that does not incur excessive contention in channel access. Designed to capture such aspect, the proposed scheme is shown to substantially decrease the latency of the retrieval.
Keywords: wireless sensor networks; medium access control; distributed algorithm; latency wireless sensor networks; medium access control; distributed algorithm; latency
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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Baek, S.J.; Yu, X.; Lee, K.; Kim, H. Retrieval of the Extreme Values under Deadline Constraints in Wireless Sensor Networks. Sensors 2011, 11, 5229-5252.

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