MOBNET: The Design and Implementation of Network Mobility Testbed for NEMO Protocol Kunchan Lan, Era

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MOBNET The Design and Implementation of Network
Mobility Testbed for NEMO ProtocolKun-chan Lan,
Eranga Perera, Henrik Petander, Christoph
Dwertmann, Lavy Libman, Mahbub HassanNational
ICT Australia (NICTA)Presented by Athanassios
Boulis
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Mobile Network

• Growing interest in provide broadband service for
  public transport passengers
• Mobile Network
• Mobile Router (MR)
• Home Agent (HA)
• OnBoard LAN, a collection of mobile network nodes
  (MNN)
• Local fixed node (LFN)
• Visiting mobile node (VMN)
• Standardized protocol NEMO
• Extension of MIPv6

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NEMO overview

• Home Agent (HA) a mobility anchor point that
  delivers packets destined to MN to the
  care-of-address of MR
• When MR starts up, it setup an bi-directional
  tunnel with HA and advertise its prefix
• For packet destined to MNN, it is encapsulated in
  another IP packet with destination address as
  Care-of-address (COA) of MR

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Network Mobility Testbed

• Physical layer models in wireless simulations are
  typically over-simplified
• Need realistic testbed
• Existing wireless testbed
• CMU (ad-hoc routing)
• TAP, Roofnet (mesh network)
• ORBIT (generic testbed)
• Existing work does not support testing of network
  mobility protocols

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Our Contribution

• Identification of a minimum set of features for
  network mobility testbed
• Design and implementation of a network mobility
  testbed
• Preliminary results from the testbed (not covered
  by this presentation)

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Mobile Network Testbed Functionality

• Emulation of a mobile network
• Experimental control
• Topology control
• Mobility control
• Management of the testbed

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Logical Structure
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Physical Structure
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Emulation of a Mobile Network

• A NEMO-based mobile router
• Extended from HUT MIPv6 for Linux
• Support NEMO implicit mode
• Can use link layer information to trigger handoff
• Support Optimistic DAD
• Support Route Optimization

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Experimental Control

• Topology control
• NIST Net WAN network emulator
• Mobility control
• Mobility emulator (MobE)
• Emulate the movement of MR
• Emulate the variations of radio propagation by
  changing the transmission power of the AP
• Can be driven used pre-made mobility patterns
• Markov Chains model
• Signal strength traces

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Mobility Emulator

• Architecture
• Input parser
• Graphical interface
• AP power level controller
• AP power level control
• web interface
• telnet
• Modeling signal strength variations
• Discrete markov chain
• Continuous
• Discrete

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Architecture of the Mobility Emulator
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Snapshot of the Emulator
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Example of Measurements
effect of network mobility using standard DAD
effect of network mobility using Optimistic DAD
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Conclusions

• A mobility testbed can be used for understanding
  the effects of network mobility on applications.
• We have used this understanding to improve
  performance of network mobility.
• On-going work
• Test bed remote management
• Virtual nodes

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Thank You!

• Questions/Comments?