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Dawud Gordon TU Braunschweig Institute of Operating Systems and Computer Networks www.ibr.cs.tu-bs.de/dus. A Study on the Use of Wireless Sensor Networks in a Retail Store. Table of Contents. Introduction Trial Setup Requirements Analysis Results Conclusion Work in Progress

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Presentation Transcript
slide1
Dawud Gordon

TU Braunschweig

Institute of Operating Systems

and Computer Networks

www.ibr.cs.tu-bs.de/dus

A Study on the Use of Wireless Sensor Networks in a Retail Store
table of contents
Table of Contents
  • Introduction
  • Trial Setup
  • Requirements Analysis
  • Results
  • Conclusion
  • Work in Progress
  • Question and Answer
introduction
Introduction
  • Evaluate WSNs in retail enviroment
  • Authors
    • Dawud Gordon
    • Masayuki Iwai
    • Michael Beigl
  • Trial implementation in Akihabara town, Tokyo
    • Created by Masayuki Iwai
introduction cont
Introduction (cont.)
  • Goals of study
    • Gather experience
    • Reduce development effort
    • Open market for high-level developers
  • Methods: Requirements analysis
    • Improve requirement definition
    • Specify weak spots
trial setup
Trial Setup
  • In-store front-end
    • Network
      • Objects + nodes
      • Sink nodes/bridges
    • Display
      • Monitor
      • Countertop
  • Central back-end
    • Server-based client analysis
    • Feedback to in-store system
  • Output
    • To owner
    • To client
setup cont
Setup (cont.)

Firewall

XBridge

Client analysis

XBridge

WWW server

XBridge

requirements
Requirements
  • Phase 1:
    • Mr. Iwai – application requirements
    • Eliminates client/user stakeholder from this analysis
  • Phase 2:
    • After Akihabara trial
    • Document Mr. Iwai‘s needs
requirements configuration
Requirements - Configuration
  • Application needs to adapt
    • Changing conditions in store
    • Market analysis
  • Dynamic changes during runtime
  • By developer/SmartStore server
    • Remote access from WWW (through firewall)
    • OTAC
  • By store owner
    • Remotely from application within LAN
    • OTAC
  • Multiple nodes at once + acked config
    • Allows reconfig of entire application
    • Saves time during development
requirements sensors
Requirements - Sensors
  • Vibration
    • Think ballswitch
    • Differentiation:
      • At rest
      • In user‘s hand
  • Light sensor
    • Large lux ranges
      • Bottoming out
      • Saturation
    • Differentiation
    • Store interior
    • Store front
requirements interactivity
Requirements - Interactivity
  • Realtime input event reporting
    • Allows systems to have interactive feel
    • Delay detracts from user experience
requirements power
Requirements - Power
  • Battery changes effort-expensive
  • Store‘s hours
    • System not active
    • Sleep mode
      • Save battery
      • Reduce maintenance
      • Manual override higher priority
  • Battery
    • TTD
    • Alert @ TTD = 24 hrs
requirements range
Requirements - Range
  • 2 scenarios present
  • High-density
    • 10m sink-to-node
  • Low-density
    • 40m sink-to-node

Client analysis

Client analysis

WWW Server

WWW server

requirements security
Requirements - Security
  • Problem: Config interference
    • Broadcast affects all in range
    • multiple apps
    • multiple apps
  • Grouping mechanism
  • Inclusion
  • NOT real security
    • Prevents interference, not attack
conclusion
Conclusion
  • Trial provided good results
    • Sensory
    • Interactivity
    • Power
    • Range
  • System still too technical
    • Programming @ HW
      • Bridge
      • Node
    • Not accessable to high-level developers
work in progress
Work in Progress
  • Abstraction from HW level
    • Think: HTML
    • Point + click
  • Akiba Sensor Node
    • In development
    • Will fulfill requirements
  • D-Bridge
    • Prototype
    • Embedded application
    • Webserver