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Alexandru Coman, Mario A. Nascimento, Jorg Sander CIKM 2005

Exploiting Redundancy in Sensor Networks for Energy Efficient Processing of Spatiotemporal Region Queries. Alexandru Coman, Mario A. Nascimento, Jorg Sander CIKM 2005. Outline. Introduction Energy-aware Flood (EFM) Map-guided Search (MSM) Experiment Conclusion. Introduction.

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Alexandru Coman, Mario A. Nascimento, Jorg Sander CIKM 2005

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  1. Exploiting Redundancy in Sensor Networks for Energy Efficient Processing of Spatiotemporal Region Queries Alexandru Coman, Mario A. Nascimento, Jorg Sander CIKM 2005

  2. Outline • Introduction • Energy-aware Flood (EFM) • Map-guided Search (MSM) • Experiment • Conclusion

  3. Introduction • The spatial distribution of data is more important than individual data values. • Confidence : C(s,l) C(a sensor node, no sensor node)

  4. Introduction 針對sensor而言 針對Query而言

  5. Energy-aware Flood (EFM) • 每個node有三種狀態, open , skip , send. • 若是該node可以被取代的話(與其他的node有重疊的區域),則將自己的state改成skip • 若是該區域所有的node都是skip的話,EFM會將energy最高者的state改成open. • 若是energy最高者,為兩個以上的node時,則由IDs來決定由何者node來open.

  6. Energy-aware Flood (EFM)

  7. Map-guided Search (MSM) • The query is forwarded in a sequential depth-first manner, only one node is processing the query at each point in time.

  8. Map-guided Search (MSM)

  9. Experiment (parameters)

  10. Experiment (Varying the Node Density)

  11. Experiment (Varying the Size of the Query Region)

  12. Conclusion • EFM: we must avoid that two nodes decide to skip and no other node will send information about their overlapping area (symmetric). • MSN的query processing time會比EFM的時間長.

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