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The authors consider hybrid wireless experimentation, which has emerged as an alternative and complementary methodology to physical experimentation and simulation for wireless network evaluation. Specifically, the focus in this paper is on WHYNET, a flexible hybrid evaluation framework providing the capability to seamlessly integrate simulated, emulated and physical networks, thereby enabling several ways of realizing a given target wireless network scenario each using physical (operational) and simulated elements in different combinations depending on the evaluation needs and available testbed resources. Using two novel and detailed case studies of WHYNET, they demonstrate the utility of the hybrid approach for realistic, scalable and cost-effective evaluation of heterogeneous wireless network scenarios and cross-layer protocol mechanisms.
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