What is it about?

Bluetooth 6.0 introduces Channel Sounding, which lets two BLE devices exchange signals and report fine‑grained measurements (such as phase and amplitude) across multiple radio channels. This paper experimentally explores whether those standard Channel Sounding measurements can act as a “wireless sensing signal”: when a person moves or stands nearby, the indoor reflections and propagation paths change, and the reported measurements change accordingly. We show early evidence of (1) stability in static conditions and (2) consistent, human‑induced variations that can be used for device‑free activity sensing.

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Why is it important?

Many device‑free sensing systems rely on Wi‑Fi CSI or SDR‑style data collection, which often requires special hardware, custom drivers, or non‑standard data access—making real‑world deployment difficult. In contrast, Bluetooth 6.0 Channel Sounding is a standardized capability designed for fine ranging (Phase‑Based Ranging and Round‑Trip Timing) and can be exposed through standard host‑controller interfaces on CS‑capable BLE platforms. This opens a path toward lower‑cost, easier‑to‑deploy sensing on widely available BLE devices and IoT hardware.

Perspectives

It is a great honor to have this work published, and I deeply appreciate the recognition of the ideas behind it. Although Bluetooth is widely used in everyday life, it has received relatively little attention in the device-free sensing community. BLE-based sensing may still have limitations today, but it also offers unique strengths. I hope that, through continued exploration and reflection, we can help BLE sensing find a fitting and practical role in device-free sensing.

cheng wang

Read the Original

This page is a summary of: Exploration of Device-Free Sensing Ability Based on Bluetooth 6.0 Channel Sounding, October 2025, ACM (Association for Computing Machinery),
DOI: 10.1145/3714394.3754369.
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