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Query Optimization in Sensor Networks

Explore the use of query optimization in wireless sensor networks to improve accuracy and efficiency in monitoring environmental phenomena over time, addressing key issues like power management and data redundancy.

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Query Optimization in Sensor Networks

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  1. Query Optimization in Sensor Networks Mark Rossman Iris Bass Supervised by: Dr. Fatma Milli

  2. Wireless Sensors Networks • Definition: A sensor network consists of many spatially distributed sensors, which are used to monitor or detect phenomena at different locations, such as temperature changes or pollutant levels. • How Sensor Networks are used: • Time Critical Projects • Situations where timeliness and accuracy is more important. • Collect lots of the data immediately because sensors are not needed later. • Monitoring Long Term Projects (our focus) • Get an accurate global model of the environment . • Collecting data throughout a lengthy period of time.

  3. Issues • Sensors • Power • Multiple sensors coordinating communication • Changes in the environment • Phenomena / Environmental Monitoring • Accuracy • Redundancy • Space-wise • Time-wise

  4. Lengthening The Life of a Network • Rotating which nodes are active • Knowledge about space redundancy • Local information • Local Strategies • Knowledge about time redundancy • Get accurate data • Maximize the life of the network

  5. Utility Based Optimization • Terms • Usefulness: Potential Contribution of the node to the query. • Utility: Cost effectiveness of interrogating the node, Usefulness/cost. • Usability: Ability of the node to contribute, Utility * Processing time remaining

  6. Process

  7. 10 20 30 5 10 Percent 20 40 30 40 Percent 50 50 Results 10 20 10 30 20 Percent 40 30 40 50 50 Percent

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