Dynamic Scatternet Modeling

1
Dynamic Scatternet Modeling

• Hanit Elisha 033963935
• Yuval Papish 032439929
• Supervisor
• Gil Zusman

2
Project Goals

• Implement a mobile model of bluetooth units, over
  a static model developed by Ronen Kofman and
  Liron Har-Shai.
• Implement routing protocol of BT Scatternet on
  OPNet simulator.
• Allow further investigation of routing protocols
  performance on mobile scatternet.

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BlueTooth Overview

• Bluetooth is the codename for a technology
  specification for small form factor, low-cost,
  low-power, short range radio links between mobile
  PCs, mobile phones and other portable devices.
• A global specification for wireless connectivity.
  Bluetooth is a cable replacement technology that
  simplifies the interaction between people as well
  as machines.

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Scatternet Structure
bridge
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ISSUES

• The bridge functionality
• How to maintain connection with more than one
  piconet.
• How frequently the bridge should switch between
  piconets.
• Bridges state when switching between piconets.
• Mobility model of bluetooth units.
• The scheduling policy inside the piconet
• Round Robin policy
• Fixed/Adjusted Priority to bridge within the
  piconet

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RESOLUTIONS

• The bridge node will go into HOLD mode for a
  fixed given time when switching between piconets.
• Well implement routing algorithms such as AODV,
  DSDV, DSR..
• Usage of wireless LAN mobility model. The model
  guidelines are
• Units moves to a random directions for a random
  period.
• Then stops for a random period.
• And so on . . .
• The scheduling policy inside the piconet
• Round Robin policy
• Fixed/Adjusted Priority to bridge within the
  piconet

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Movement

• Movement is implemented on the baseband process
  of each device. The baseband also verifies which
  packages were sent from proper distance.

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Piconets management

• The piconet management is done in the application
  process. In the master, it includes connecting
  and disconnecting of slaves, as well as
  assignment of piconets addresses (am_addr). In
  slaves, the application process handles masters
  polling packages.

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Mobility

• Mobility is crucial for investigating routing
  protocols over scatternet. A static model cannot
  be used for this purpose.
• Our mobility includes disconnecting and
  reconnecting of units from piconets, as a
  function of their distance from each other.
• The devices movement cant be predicted, and
  piconets are been created and destroyed like in
  the real world.

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Enviroment CAD Tools

• Network Simulator OPNet- simulation platform
  based on C.
• Bluetooth model developed by Comnet students
  Ronen Kofman and Liron Har-Shai.