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Piconet: Embedded Mobile Networking. F. Bennett, D. Clarke, and J. B. Evans in IEEE Personal Communications, Vol. 4, No. 5, Oct. 1997, pp. 8-15 -- presented by Yu-Chee Tseng --. Embedded Mobile Networking. There already exist many simple communication devices around our everyday life:

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piconet embedded mobile networking

Piconet: Embedded Mobile Networking

F. Bennett, D. Clarke, and J. B. Evans

in IEEE Personal Communications, Vol. 4, No. 5, Oct. 1997, pp. 8-15

-- presented by Yu-Chee Tseng --

embedded mobile networking
Embedded Mobile Networking
  • There already exist many simple communication devices around our everyday life:
    • phone, fax, copy machine
    • printer, portable computer, PDA
    • electronic access control to buildings and roads
    • banking machine
    • public information terminal, etc.
  • Imagine how much we may benefit if these devices can TALK with each other.
benefit of embedded networks
Benefit of Embedded Networks
  • Embedded Network:
    • a small, wireless, portable communication device
    • can be embedded in many communication devices
      • and thus connect them together
  • Enhanced personal connectivity
    • we have a multitude of connections to many devices
  • Context awareness
    • the connectivity differs as we move around
piconet of orl
Piconet of ORL
  • Developed by ORL (Olivetti and Oracle Research):
    • general purpose
    • low powered
    • ad-hoc radio
  • Can talk to a multitude of computing and communication devices:
    • static, mobile, or embedded
    • used for sensing, communication, and control
    • to support only a “base level” of connectivity between things.
technological choices of piconet
Technological Choices of Piconet
  • ubiquitous
    • periodically convey its state to others
    • indoor or outdoor, exposed or embedded, line-of-sight or diffused
  • low-power, low-rate, low-range
    • sleep (switched off) most of the time
  • radio-based
    • IrDA (infrared) was not chosen as its inappropriateness in outdoor use
prototype piconet hardware
Prototype Piconet Hardware
  • size: 12cm x 7cm
  • implemented in FPGA
  • major components:
    • radio
    • protocol
    • runtime environment
    • attribute store
  • 418 MHz FM transceiver
  • around 5 meters of transmission range
    • low-powered and cheap
    • greater re-use of radio channel
    • close to human’s definition of “proximity”
  • ad-hoc, without base station
  • for short-lived transaction, not long-lived stream of data
  • 4b6b DC balanced encoding
  • support 2 kinds of multicast:
    • well-known (pre-assigned)
    • transient (dynamically created)
runtime environment
Runtime Environment
  • on-board kernel
    • a message queue
    • a scheduler
  • on-board loader
attribute store
Attribute Store
  • In Piconet, each node is responsible for describing itself to the rest of the world.
    • any other node is thus able to determine what kind of services is provided by the device.
  • A mapping between a device’s name and service type should be supported.
    • called “attribute store” in Piconet

Board and radio


Radio piggy-back

in place

application 1 automatic temperature report
Application #1: Automatic Temperature Report
  • a temperature sensor with a Piconet interface
  • another node coming close to this sensor
  • a communication example:

QuerySensor’s Reply

GetAttribute(“/name”) “/name=Temperature Sensor”

//discover sensor name

GetAttribute(“/temp/C/value”) “/temp/C/value” = “17”

//get temperature

WatchAttribute(“/temp/C/change5”) “WatchHandle 01”

01 “tmp/C” = “24”

//submit a handle, and

//watch for any temperature change


UnwatchAttribute(01) //release handle

//or timeout, if the node disappears

application 2 pico gps in a car
Application #2: Pico + GPS in a Car

an in-car GPS with Pico

(can talk to many devices

in the car)

a map system for


a PDA in briefcase

which logs

a “trace” of this trip

(when returning to

office, the log can

be automatically

entered to database)

an “authorized” mobile phone

which can report the driver’s current

location to someone far away

(or, for location coordination)

application 3 integration with existing services
Application #3: Integration with Existing Services
  • “authorized” phone, printer, etc
  • control of home appliances:
    • VCR, microwave, clock, radio, PDA
    • house heating system, control house lighting
    • connecting to networks for email, WWW, etc.
  • Only your imagination can limit!!
application 4 tour guide
Application #4: Tour Guide

information terminals

at building (museum,

gallery, tourist site)

Pico at road sign and gateway to guide direction and offer tour info.

  • A music CD with a piconet!!