Personal%20Server%20Model%20for%20Real-Space%20Networking

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Personal Server Model for Real-Space Networking

• Shirou WAKAYAMA
• shirou_at_sfc.keio.ac.jp
• KEIO University Japan.

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Motivation

• Attain Computing Environment using information in
  Real-Space
• Active Bat (Location-aware system using RF)
• GUIDE(Location-aware system using Wireless LAN)
• Oxygen(Location-sensing and using embedded
• computers around the user)

Can not utilize various sensors in each system ?
Limited system availability and sensor
variation We want to use various sensors in more
Wide-area
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Sample Applications

• Autonomous information obtainment
• current location
• name of the person standing before the user
• Autonomous health-care support
• Call ambulance automatically, when users
  physical condition change suddenly
• Autonomous diary generation
• Log users daily activity automatically

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Assumed Environment

• Pervasive/Ubiquitous Computing environment
• Users can be unaware of computers and devices
• Surrounding environment should care
• Centralization to Distribution!
• Users move in wide-area
• Outside of lab, campus, town, everywhere
• Various public sensors are setup everywhere
• Sensors differ depending on places
• Sensors nearby user will sense and inform
• The Internet is used to connect sensors each other

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Problem statement

• No common interfaces between each
  research/sensors
• Each research has own Sensor information managers
  and models
• No work has done to provide interoperability
• No model to make use of various sensors while
  moving anywhere
• No overarching model

Sensor information Management Model is required
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Model Requirements

• Sensor information be obtained anywhere
• Location Independent
• Various sensor-devices be utilized
• Sensor-type Independent
• Information be shared between people requested
• Only authorized people could request

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Existing model consideration

• Aggregate/Manage all sensor information to one
  Central Server
• Less scalability
• Manage sensor information by servers
  corresponding to each sensor
• As users move, surrounding sensors will change
  accordingly
• Other users may not know where to request sensor
  information of specific user

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Personal Server Model(1/2)

• Manage Sensor information by servers
  corresponding to each user
• Manager can be set anywhere on the Internet
• Manager can aggregate/manage information from
  various sensors bound to each user
• Other users can request sensor information by
  user specified

Location/Sensor-type Independency in Pervasive
Computing environment provided
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Personal Server Model(2/2)
Globally Unique ID GUID
Real-Space
Sensors
Middle Sensor Layer
C
B
A
Virtual-Space
Personal Server Sensor information manager
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Experimentation

• Experimentation
• 2002 Sep. , with 274 people , 4days 3night
• In the WIDE Project meeting
• Sensor information
• Location-information from RF-ID and IP address
• Temperature information of electric hot-water pot
• Information service via Web interface
• Locate a person
• List people in a room specified
• Temperature information of pot

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System overview
PS Personal Server
Users
SQL
Other Application
PS
PS
HTTPD
PS
HTTP
RF-ID
IP Address
Pot
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Location Sensing by RF-ID
Sensor device(1/3)
RF Base Stations
Antenna
Antenna Cable
All User had RF-tag, that Send GUID through RF.
RF-tag Sensor
RS-232C
Send Sensor Information to Personal Server of
GUID owner
To Personal Server
Ethernet
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RF Base Station
Coverage
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Sensing by IP Address
Sensor device(2/3)

• IP address for location sensing
• IPv6 segment(prefix) differ per room
• DB has binding of prefix and room name

Location information of Note PC per room can be
provided
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Pot (Temperature Information)
Sensor Device(3/3)
Temperature Sensor
Micro Node
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Locating a person
Service(1/2)
Locate your friend
Find out from GUID
Find out from Name
Find out from Organization
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Listing people in a room specified
Service(2/2)
List people
Click the room,
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Sensed Movement
Actual Movement
Sensed Movement
NOC
PLENARY2
PLENARY1
LOBBY4
LOBBY3
LOBBY2
LOBBY1
BOF3
BOF2
BOF1
000
1200
2400
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Location Informationfrom RF-ID and IP addr.
IP addr
RFID
NOC
PLENARY2
PLENARY1
LOBBY4
LOBBY3
LOBBY2
Divide One large room to Two
LOBBY1
BOF3
BOF2
BOF1
000
1200
2400
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Future Work

• Test scalability of Personal Server Model
• Not evaluated about Scalability with large number
  of Personal Servers and users
• Not evaluated about Scalability of mechanism that
  resolves IP address of Personal Server from GUID
• Privacy Protection
• Secure communication between Sensor and Personal
  Server
• Secure user authentication

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Conclusion

• Personal Server Model
• Personal Server manage sensor information per
  user
• Personal Server Model realizes
• Location independency
• Sensor-type independency
• Pervasive Computing environment
• Sharing information between people
• Experimentation
• Multiple sensor devices used for information
  acquisition
• Web interface used
• Personal Server Model can apply to the everyday
  use