Academic research in mobile wireless networks relies largely on simulation. However, fidelity of simulation results has always been a concern, especially when the protocols being studied are affected by the propagation and interference characteristics of the radio channels. Inherent difficulty in faithfully modeling the wireless channel behaviors has encouraged several researchers to build wireless testbeds. One key difficulty of setting up a multi-hop wireless testbed is that it must be spread over a large physical space to introduce non-overlapping collision domains. This makes the setup, management and configuration of these testbeds challenging. In this thesis we focus on alleviating the space problem by designing a miniaturized 802.11b based, multi-hop wireless network testbed, called MiNT. MiNT occupies significantly smaller space compared to existing testbeds in use for mobile wireless experiments. Engineered completely from off-the-shelf components, each node in MINT supports untethered mobility that is controlled remotely. We also present solutions for problems associated with node mobility, namely node tracking in the testbed arena, and collision free node movement.
In order to provide flexibility in terms of setup, management and reconfigurability, MiNT provides a graphical interface for getting complete view of the testbed. Mint cOntrol and Visualization InterfacE (MOVIE) provides a suite of necessary controls for configuring each node, the entire topology, as well as, collects and displays experiment related statistics in real-time as well as offline. In addition to supporting the regular features for remotely operating the testhed, MiNT also supports two novel features: (i) hybrid simulation capability, and (ii) a fault injection and analysis tool (FIAT). Hybrid simulation allows execution of simulation experiments on MiNT with the modeled link, MAC and physical layer replaced by real hardware. Our results show that hybrid simulation provides more accurate results compared to pure simulation. Our hybrid simulation technique implemented on top of ns-2 has rich functionalities, like execution rollback, pause and breakpointing execution on flagged events, that makes debugging easier. The fault injection and analysis tool helps in debugging implementations of network protocols by introducing user-specified network faults without requiring any code instrumentation.
In the thesis we demonstrate the fidelity of our miniaturization approach by comparing experimental results on it with similar experiments conducted on a non-miniaturized testbed. Evaluations of hybrid simulation results against pure simulation results show the efficacy of the new approach in evaluating wireless protocols and applications. Evaluations of MOVIE and FIAT is intended to highlight the correctness and usability of the tools. Finally, we also a present a case study to underline the usefulness of MiNT, and a critique on remote usability of MiNT.
|School:||State University of New York at Stony Brook|
|School Location:||United States -- New York|
|Source:||DAI-B 69/01, Dissertation Abstracts International|
|Keywords:||Attenuation, Mobility, Testbed, Wireless networks|
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