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Enhancing ASSERT: Accurate & User-Friendly Wireless Testbed

Learn about ASSERT propositions, hardware design, software slices, feedback analysis, and data collection in this detailed guide to building an advanced wireless testbed for network experimentation. Discover how to improve accuracy, controllability, mobility, repeatability, cost-effectiveness, data collection, resource sharing, multi-nodal capability, and scalability.

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Enhancing ASSERT: Accurate & User-Friendly Wireless Testbed

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  1. Enhancing ASSERT: Making an Accurate Testbed Friendly EhsanNourbakhsh, Ryan Burchfield, S. Venkatesan, Neeraj Mittal, Ravi Prakash Department of Computer Science University of Texas at Dallas

  2. Motivation • Made observations in [RFiJ] regarding experimentation • In [ASSERT] we proposed nine main propositions, and built a testbed based on them • Advanced wireleSSEnvironment Research Testbed • Our focus changed from only fidelity to also include usability • Proper usage of the testbed should not require comprehensive knowledge of the design and implementation of the testbed.

  3. Propositions • Accuracy • accurately reflect wireless network behavior • Controllability • provide enough control to configure topology and environment conditions • Mobility • emulate mobility of the nodes • Repeatability • conduct experiments that are reproducible and easily repeatable • Cost effectiveness • be cost effective in terms of hardware, manpower, space and time requirements to set up, run experiments on and maintain • Data collection • provide necessary tools to collect and analyze data • Resource sharing • be able to share the available resources to conduct multiple experiments without interfering with each other • Multi-nodal capability • support many types of nodes • Scalability • have the ability to scale to a large number of nodes

  4. Hardware Design • Site: unit for hardware design • Microprocessor runs Linux • Black-box view of Unit Under Test (UUT) • Control and interaction with the UUT

  5. Hardware Design (contd.)

  6. Hardware Design (contd.) • RF board

  7. Hardware Design(contd.)

  8. Hardware Design (contd.)

  9. Software Slices • software is divided into slices • each slice implements a specific functionality • Some of the major ones • diagnostics • user interface • experiment control • topology mapper • attenuator • UUT control

  10. Software Slices (contd.)

  11. Feedback Analysis • Graduated from “functionality centric” to “user centric” • “it works” vs. “it is easy to work with” • Ease of running experiments results in expectation of enhanced tools • easily upload their custom images to UUTs • ability to verify proper experiment start and progress • tools for debugging and investigating collected data • possibility of creating customized distribution models.

  12. Capability and Flexibility • Cable Map • Topology Maker • Topology Mapping • Distribution Cleanup • Application Parameters

  13. Cable Map

  14. Topology Maker

  15. Topology Mapping Time

  16. Verification • Log Viewer • Remote Access

  17. Log Viewer

  18. Run Time Average time for each task over three runs for a 30 minute experiment with 24 nodes

  19. Data Collection • Timestamp Adjustments in UUT Logs • Log Download • RSS Log

  20. RSS Log Viewer Unicast by 1013 ACK by 1007 Reception by 1007, 1016 Broadcast by 1007 Broadcast by 1013

  21. References • [RFiJ] Ryan Burchfield and EhsanNourbakhsh and Jeff Dix and KunalSahu and S. Venkatesan and Ravi Prakash, “RF in the Jungle: Effect of Environment Assumptions on Wireless Experiment Repeatability,” ICC 2009 • [ASSERT] EhsanNourbakhsh and Jeff Dix and Paul Johnson and Ryan Burchfield and S. Venkatesan and Neeraj Mittal and Ravi Prakash, “ASSERT: A Wireless Networking Testbed,”TridentCom2010

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