Time-varying Opportunistic Protocol for maximizing sensor networks lifetime

Authors:
Kobi Cohen;Amir Leshem
Affiliations:
School of Engineering, Bar-Ilan university, Ramat-Gan, 52900, Israel;School of Engineering, Bar-Ilan university, Ramat-Gan, 52900, Israel
Venue:
ICASSP '09 Proceedings of the 2009 IEEE International Conference on Acoustics, Speech and Signal Processing
Year:
2009

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A time-varying opportunistic approach to lifetime maximization of wireless sensor networks

IEEE Transactions on Signal Processing

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Abstract

We consider transmission scheduling by medium access control (MAC) protocols for energy limited wireless sensor networks (WSN) in order to maximize the network lifetime. Time-varying Opportunistic Protocol (TOP) for maximizing the network lifetime is proposed. By executing TOP each sensor exploits local channel state information (CSI) and local residual energy information (REI). TOP implements opportunistic strategy in terms of favoring sensors with better channels when the network is young, while less opportunistic and more conservative strategy in terms of prioritizing sensors with higher residual energy when the network is old. TOP significantly simplifies the implementation of carrier sensing as compared to other distributed MAC protocols. Simulation results show that TOP achieves significant performance gains over other distributed MAC protocols.