L. Bölöni and D. Turgut

Should I send now or send later? A decision-theoretic approach to transmission scheduling in sensor networks with mobile sinks


Cite as:

L. Bölöni and D. Turgut. Should I send now or send later? A decision-theoretic approach to transmission scheduling in sensor networks with mobile sinks. Special Issue of Wiley's Wireless Communications and Mobile Computing Journal (WCMC) on Mobility Management and Wireless Access, 8(3):385–403, March 2008.

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Abstract:

Mobile sinks can significantly extend the lifetime of a sensor network by eliminating the need for expensive hop-by-hop routing. However, a sensor node might not always have a mobile sink in transmission range, or the mobile sink might be so far that the data transmission would be very expensive. In the latter case, the sensor node needs to make a decision whether it should send the data now, or take the risk to wait for a more favorable occasion. Making the right decisions in this transmission scheduling problem has significant impact on the performance and lifetime of the node. In this paper,we investigate the fundamentals of the transmission scheduling problem for sensor networks with mobile sinks. We first develop a dynamic programming-based optimal algorithm for the case when the mobility of the sinks is known in advance. Then, we describe two decision theoretic algorithms which use only probabilistic models learned from the history of interaction with the mobile sinks, and do not require knowledge about their future mobility patterns. The first algorithm uses Markov Decision Processes with states without history information, while the second algorithm encodes some elements of the history into the state. Through a series of experiments, we show that the decision theoretic approaches significantly outperform naive heuristics, and can have a performance close to that of the optimal approach, without requiring an advance knowledge of the mobility.

BibTeX:

@article{Boloni-2008-WCMC, 
   author = "L. B{\"o}l{\"o}ni and D. Turgut",
   title = "Should I send now or send later? A decision-theoretic approach to 
   transmission scheduling in sensor networks with mobile sinks",
   journal = "Special Issue of Wiley's Wireless Communications and Mobile 
   Computing Journal (WCMC) on Mobility Management and Wireless Access",
   volume = "8",
   number = "3",
   pages = "385-403",
   month = "March",
   year = "2008",
   abstract = {
      Mobile sinks can significantly extend the lifetime of a sensor network by
      eliminating the need for expensive hop-by-hop routing. However, a sensor
      node might not always have a mobile sink in transmission range, or the
      mobile sink might be so far that the data transmission would be very
      expensive. In the latter case, the sensor node needs to make a decision
      whether it should send the data now, or take the risk to wait for a more
      favorable occasion. Making the right decisions in this transmission
      scheduling problem has significant impact on the performance and lifetime
      of the node. In this paper,we investigate the fundamentals of the
      transmission scheduling problem for sensor networks with mobile sinks. We
      first develop a dynamic programming-based optimal algorithm for the case
      when the mobility of the sinks is known in advance. Then, we describe two
      decision theoretic algorithms which use only probabilistic models learned
      from the history of interaction with the mobile sinks, and do not require
      knowledge about their future mobility patterns. The first algorithm uses
      Markov Decision Processes with states without history information, while
      the second algorithm encodes some elements of the history into the state.
      Through a series of experiments, we show that the decision theoretic
      approaches significantly outperform naive heuristics, and can have a
      performance close to that of the optimal approach, without requiring an
      advance knowledge of the mobility.},
}

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