1 / 13

ECET 581

ECET 581. Wireless Sensor Networks Sensor Network Data Management December 5, 2006 Fall 2006 http://www.etcs.ipfw.edu/~lin References:

winifred-vazquez
Télécharger la présentation

ECET 581

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ECET 581 Wireless Sensor Networks Sensor Network Data Management December 5, 2006 Fall 2006 http://www.etcs.ipfw.edu/~lin References: **Ch 6 Sensor Network Databases of the book: "Wireless Sensor Networks - An Information Processing Approach," by Feng Zhao and Leonidas Guibas, from Morgan Kaufmann/Elsevier inc, 2004 ** Ch 10 Data Management of the book: Principles of Embedded Networked System Design, by Gregory and William Kaiser, from Cambridge University Press **TMote Sky Web site: www.moteiv.com WSN Mote- MCU & Sensor Hardware

  2. Sensor Networks Data Management • Traditional Database Management System • Sensor Data & Database • Sensor data organization • Distributed storage • Query & access • Wireless Sensor Database Design • Data Flow in Sensor Networks • High-level Reasoning WSN Mote- MCU & Sensor Hardware

  3. Traditional Database Management System – an overview • Layered Architecture • Database • DBMS (Database Management System) • Communication Network • Client WSN Mote- MCU & Sensor Hardware

  4. Traditional Database Management System – an overview • Database Schema – the structure and constraints of the data format defined through Data Definition Language (DDL) • Table • Rows - record tuples • Column – data attributes • DDL Compiler • Translates these definitions into Metadata • Metadata – a data structure describing the structure of database and constraints WSN Mote- MCU & Sensor Hardware

  5. Traditional Database Management System – an overview • Transactions - a sequence of operations • Retrieving data • Database updating • Producing new tables • ACID Properties • Atomicity – all of the transaction takes place or nothing changes in the DB • Consistency – correctness (from begin to end) • Isolation – the transaction is concealed from other transactions until it commits • Durability – update effected by a transaction survive until affected by other transactions WSN Mote- MCU & Sensor Hardware

  6. Traditional Database Management System – an overview • Query • Query Language – SQL (Structured Query Language) • Join, group-by, sort, scan • Query processor • Execution engine • Data storage • Geographically distributed at various locations • Robust to failure • Web-based access, remote access WSN Mote- MCU & Sensor Hardware

  7. Sensor Data & Database • Data Info of Sensor Network • Time-stamped measurements of physical phenomena • Heat, sound, light, pressure, motion, etc • Abstract data representation • Detection, classification, tracking, etc • Sensor Description: location, types, etc • Database? • Traditional DBMS system • DB within the network WSN Mote- MCU & Sensor Hardware

  8. Sensor Data & Database • Challenges • The system is highly volatile • Relational data tables are not static – new data is continuously being sensed • High energy cost in communication – encourage in network query • Long delay, need to continuously monitor the rates and availability of data • Maintain high-level statistical summaries: Limited storage on node and high communication cost • Sensor queries: queries from others, and self generated queries • Metrics of performance WSN Mote- MCU & Sensor Hardware

  9. Distributed Database – Wireless Sensor Network • A set of database sites, each is a complete database system • Local DB – store frequently used data to minimize long-distance retrieval of large quantities of data • Fault tolerant • Primary copy, Secondary copies • Data object naming: • Creator ID • Creator Site ID • Local name • Birth site ID WSN Mote- MCU & Sensor Hardware

  10. Data Flow in Sensor Networks • Data Management • Queries should direct • collection, storage, and transport of data and geographical and temporal scope • Signal processing, aggregation, and routing strategies • Must still consider • Concurrency • Integrity • Security • Efficiency WSN Mote- MCU & Sensor Hardware

  11. Data Flow in Sensor Networks • Dealing with the infinite • Probabilistic data collection • Sensor networks as data compression engine • Interest diffusion • Adaptive data collection • Standards vs. custom design WSN Mote- MCU & Sensor Hardware

  12. TinyDB Features • Metadata management • High-level queries: SQL like • Network topology • Tracking neighbors, and maintaining routing tables to determine how to deliver data efficiently • Multiple queries • diff sample rate and access diff sensors • Incremental deployment using query sharing WSN Mote- MCU & Sensor Hardware

  13. High-Level Reasoning • Data Mining • Logic: if, then, else, not, therefore • Bayesian Networks – Belief networks • Language • Prolog WSN Mote- MCU & Sensor Hardware

More Related