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Author Ghidini, Giacomo ♦ Das, Sajal K.
Source ACM Digital Library
Content type Text
Publisher Association for Computing Machinery (ACM)
File Format PDF
Copyright Year ©2012
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Wireless sensor networks ♦ Connection delay ♦ Duty cycling ♦ Media access control ♦ Time synchronization
Abstract To extend the lifetime of a wireless sensor network, sensor nodes usually duty cycle between dormant and active states. Duty cycling schemes are often evaluated in terms of connection delay, connection duration, and duty cycle. In this article, we show with experiments on Sun SPOT sensors that duty cycling time (energy) efficiency, that is, the ratio of time (energy) employed in ancillary operations when switching from and into deep sleep mode, is an important performance metric too. We propose a novel randomized duty cycling scheme based on Markov chains with the goal of (i) reducing the connection delay, while maintaining a given time (energy) efficiency, or (ii) keeping a constant connection delay, while increasing the time (energy) efficiency. Analytical and experimental results demonstrate that the Markov chain-based scheme can improve the performance in terms of connection delay without affecting the time efficiency, or vice versa, as opposed to the trade-off observed in traditional schemes. We extend the proposed duty cycling scheme to a partially randomized scheme, where wireless nodes can switch into active state beyond their schedules when their neighbors are active to anticipate message forwarding. The analytical and experimental results confirm the relationship between connection delay and time efficiency also for this scheme.
ISSN 15504832
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2012-11-01
Publisher Place New York
e-ISSN 15504840
Journal ACM Journal on Emerging Technologies in Computing Systems (JETC)
Volume Number 8
Issue Number 4
Page Count 32
Starting Page 1
Ending Page 32


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Source: ACM Digital Library