Rfid topics
This presentation is the property of its rightful owner.
Sponsored Links
1 / 18

RFID Topics PowerPoint PPT Presentation


  • 100 Views
  • Uploaded on
  • Presentation posted in: General

RFID Topics. Temporal Management of RFID Data. Mo Liu Bart Shappee. OUTLINE. RFID Background DRER Model Overview of Syntax Data Acquisition Tool for efficiency Siemens Work. RFID - Background. Radio Frequency Identification Major Characteristics: Streaming Data

Download Presentation

RFID Topics

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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Rfid topics

RFID Topics

Temporal Management of RFID Data

Mo Liu

Bart Shappee


Outline

OUTLINE

  • RFID Background

  • DRER Model

  • Overview of Syntax

  • Data Acquisition

  • Tool for efficiency

  • Siemens Work

Worcester Polytechnic Institute


Rfid background

RFID - Background

  • Radio Frequency Identification

  • Major Characteristics:

    • Streaming Data

      • Temporal and Dynamic

    • Unreliable Data

      • Mainly Missed Reads & Duplicates

    • Very Large Volume of Information

    • Integration

      • RFID Data needs to be handled by existing applications

Worcester Polytechnic Institute


Cont d

Cont’d

  • Integration & Information - What we need to consider:

    • Time

    • Location

      • Being in the physical world

    • Aggregation

Worcester Polytechnic Institute


Dynamic relationship er model drer

Dynamic Relationship ER Model (DRER)

  • RFID entities are static and are not altered in the businessprocesses

  • RFID relationships: dynamic and change all the time

  • Dynamic Relationship ER Model

    – Simple extension of ER model

    Two types of dynamic relationships added:

    – Event-based dynamic relationship. A timestamp attribute added torepresent the occurring timestamp of the event

    – State-based dynamic relationship. tstart and tend attributes addedto represent the lifespan of a state

Worcester Polytechnic Institute


Dynamic relationship er model drer cont d

Dynamic Relationship ER Model (DRER) (cont’d)

Worcester Polytechnic Institute


Cont d1

cont’d

  • Static entity tables

    OBJECT (epc, name, description)

    SENSOR (sensor_epc, name, description)

    LOCATION (location_id, name, owner)

    TRANSACTION (transaction_id, transaction_type)

Worcester Polytechnic Institute


Cont d2

cont’d

  • Dynamic relationship tables

    OBSERVATION (sensor_epc, value, timestamp)

SENSORLOCATION (sensor_epc, location_id, position, tstart, tend)

Worcester Polytechnic Institute


Rfid topics

OBJECTLOCATION(epc, location id, tstart,tend)

CONTAINMENT(epc, parent epc, tstart,tend)

TRANSACTIONITEM(transaction_id, epc, timestamp)

Worcester Polytechnic Institute


Tracking and monitoring rfid data

Tracking and Monitoring RFID Data

  • RFID object tracking:find the location history of object“EPC”

    SELECT * FROM OBJECTLOCATION WHERE epc='EPC‘

    Missing RFID object detection: find when and where object“mepc” was lost

    SELECT location_id, tstart, tend

    FROM OBJECTLOCATION

    WHERE epc='mepc' and tstart =(SELECT MAX(o.tstart)

    FROM OBJECTLOCATION o

    WHERE o.epc=‘mepc')

  • RFID object identification: a customer returns a product

    “XEPC”. Check if the product was sold from this store

    SELECT * FROM OBJECTLOCATION

    WHERE epc='XEPC' AND location_id='L003'

Worcester Polytechnic Institute


Cont d3

Cont’d

  • Temporal aggregation of RFID data: find how many itemsloaded into the store “L003” on the day of 11/09/2004

    SELECT count(epc)FROM OBJECTLOCATION

    WHERE location_id = 'L003'

    AND tstart <= '2004-11-09 00:00:00.000'

    AND tend >= '2004-11-09 00:00:00.000‘

  • RFID Data Monitoring—monitor the states of RFID objects

    RFID object snapshot query: find the direct container of object “EPC” at time T

    SELECT parent_epc FROM CONTAINMENT

    WHERE epc='EPC' AND tstart <= 'T' AND tend >= 'T'

Worcester Polytechnic Institute


Rfid data acquisition

Data is automatically generated from the physical world through Readers and Tags

Modes if Acquisition

Full/Half Duplex

Sequential Mode

This information includes EPCs and timestamps

Other stored values may also be transmitted

PHYSICAL WORLD

TAG

2

Antenna (interface)

2

Controller

2

Application

RFID - Data Acquisition

Worcester Polytechnic Institute


Rfid data acquisition part 2

RFID - DATA Acquisition Part 2

How do we improve on this?

Data is also pre-porocessed

  • Data Filtering

  • Local Transformation

  • Data Aggregation

OBSERVATION(Rx, e, Tx),

OBSERVATION(Ry, e, Ty), Rx<>Ry,

within(Tx, Ty, T) -> DROP:OBSERVATIONS(Rx, e, Tx)

Seq(s,”r2”);OBSERVATION(“r2”. E. t) ->

INSERT:CONTAINMENT(seg(s, “r2”, Tseq), e, t, “UC”)

OBSERVATION(“R2”, e, t) ->

UPDATE:OBJECTLOCATION(e, “L002”, t, “UC”)

Worcester Polytechnic Institute


Rfid data acquisition part 3

RFID - DATA Acquisition Part 3

How do we improve on this (even more)?

Data is also handled with rules

some examples are:

  • Sate Modification (i.e. time at toll)

    • Creation

    • Deletion

  • Containment (1000 ipods in a case)

    • Change location of the 1000 ipods

Worcester Polytechnic Institute


A tool to improve query efficiency

A Tool to improve query efficiency

Worcester Polytechnic Institute


Data partitioning

Increase of data volumes slows down queries

Data have a limited active cycle

– Non-active objects can be periodicallyarchived into historysegments

– Active segments with a high active object ratio is used for updates

This partition technique assures efficient update andqueries

Data Partitioning

Worcester Polytechnic Institute


Siemens s product

Siemens's Product

  • Middleware

    • Automatic acquisition and filtering

    • Have built a working prototype

Worcester Polytechnic Institute


Conclusion

Conclusion

  • Laid a framework for the problems of RFID data acquisition and handling

  • This paper introduced and pushed the DRER model

Worcester Polytechnic Institute


  • Login