TL;DR
This paper introduces WACA, a system that measures energy across all Wi-Fi channels at 5 GHz with microsecond precision, enabling detailed analysis of Wi-Fi spectrum usage in various environments.
Contribution
WACA is the first system capable of simultaneous, high-resolution measurement of all Wi-Fi channels at 5 GHz, facilitating new insights into multi-channel Wi-Fi performance.
Findings
Non-contiguous channel bonding can outperform contiguous bonding in peak throughput.
Average throughputs of contiguous and non-contiguous bonding are similar.
WACA provides a valuable dataset for Wi-Fi spectrum analysis.
Abstract
In this paper, we present WACA, the first system to simultaneously measure the energy in all 24 Wi-Fi channels that allow channel bonding at 5 GHz with microsecond scale granularity. With WACA, we perform a first-of-its-kind measurement campaign in areas including urban hotspots, residential neighborhoods, universities, and a sold-out stadium with 98,000 fans and 12,000 simultaneous Wi-Fi connections. The gathered dataset is a unique asset to find insights otherwise not possible in the context of multi-channel technologies like Wi-Fi. To show its potential, we compare the performance of contiguous and non-contiguous channel bonding using a trace-driven framework. We show that while non-contiguous outperforms contiguous channel bonding's throughput, occasionally bigger by a factor of 5, their average throughputs are similar.
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