ASSERT: System Level Wireless Networking Testbed 11/22/2018 ASSERT: System Level Wireless Networking Testbed Ehsan Nourbakhsh, Jeff Dix, Paul Johnson, Ryan Burchfield, S. Venkatesan, Neeraj Mittal, and Ravi Prakash Distributed Systems Laboratory The University of Texas at Dallas

Research in wireless networking and distributed systems 11/22/2018 DSLab @ UTD Research in wireless networking and distributed systems MAC layer protocols Autoconfiguration Routing Transport layer MANET/VANET/SensorNets Algorithm design, simulations, implementation Before we dive into the design of the testbed it is better to understand WHY we want the testbed. Our research group works in these fields. LIST Increasing awareness the simulators for these technologies have there unique simplifying assumptions and differences. (Cavin et al.) D. Cavin, Y. Sasson, and A. Schiper, “On the Accuracy of MANET Simulators,” in Proceedings of the Second ACM International Workshop on Principles of Mobile Computing (POMC), 2002, pp. 38–43 5/19/2010

Goals of Wireless Networking Experiments 11/22/2018 Goals of Wireless Networking Experiments Accuracy Controllability Mobility Repeatability Cost effectiveness Data collection Resource sharing Multi-nodal capability Scalability With those uses in mind our goal was to develop a flexible wireless network testbed with fewer assumptions. We specifically enumerated these goals. 5/19/2010

Wireless Experiment Fidelity Outdoor: Softball Field Public Park Indoor: EE to CS CS to EE Coaxial Testbed: 5/19/2010

Testbed: Site Conceptual View 11/22/2018 Testbed: Site Conceptual View Each site will be a minimal linux device, controlling a unit under test; multiple RF links to neighbors in a “grid”; controlled by a bigger testbed control; controlling attenuators will control the way connections to neighbors is seen by UUT hence a topology is shaped; 5/19/2010 5

Testbed: Site Hardware View 11/22/2018 Testbed: Site Hardware View 5/19/2010

Example Interconnection 5/19/2010

11/22/2018 Digital Board 5/19/2010

11/22/2018 RF Board 5/19/2010

Assembled Testbed 5/19/2010

Testbed Site 5/19/2010

Testbed: Software Architecture 11/22/2018 Testbed: Software Architecture 5/19/2010 12

Software Architecture 11/22/2018 Software Architecture Diagnostics Test links and sites between experiments. Update the View of test-bed. User Interface Show a GUI to user for designing and initiating experiments. Web based. Stateless. 5/19/2010

Software Architecture (cont.) 11/22/2018 Software Architecture (cont.) Topology Mapper Map the request of user to currently available sites. Instruct how to change attenuation levels to emulate different scenarios. Reservation Reserve available sites for specific experiment. Inform control center of expired sites. Handle cancellations. 5/19/2010

Software Architecture (cont.) 11/22/2018 Software Architecture (cont.) Attenuator Control Set attenuation value on sites Handle requests to set attenuation values UUT Control Communicate with UUT to start and end experiments. System state is intentionally stale, uses heartbeat messages to update periodically as it goes 5/19/2010 15

Software Architecture (cont.) 11/22/2018 Software Architecture (cont.) System State Database of system condition Sites Links Experiments Logging Log software messages Internal to test-bed control 5/19/2010

… … … … Experiment Setup Testbed Super-Graph Testbed Super-Graph ∞ δ Testbed Super-Graph … Experiment Desired Topology … … 5/19/2010

Mobility Base Station Atten. UUT/CPE Atten. 5/19/2010

Scalable Architecture No replacement for field-tests Future work 11/22/2018 Conclusion Platform for: Repeatable experiments Mobility experiments Protocol stress testing Heterogeneous nodes Scalable Architecture No replacement for field-tests Future work Multi-path effects MIMO Greater range of frequency bands External users Information: http://dslab.utdallas.edu Email: ryanb@utdallas.edu 5/19/2010