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Google's Pixel Watch 3 skips UWB, uses Bluetooth tracking instead: Report
What is Channel Sounding?
Channel Sounding is part of the Bluetooth 6.0 standard, announced in September 2024. Unlike traditional Bluetooth tracking that relies on signal strength (which can be affected by obstacles like walls or furniture), Channel Sounding measures the time it takes for multiple signals – sent at varying frequencies – to travel between devices.
This allows for:
Although the Pixel Watch 3 supports Channel Sounding, it remains unused for now as it requires multiple devices with the same capability to be effective. Broader adoption is expected with the launch of more Bluetooth 6.0-enabled devices, including the upcoming Pixel Watch 4 in August 2025.
Why Channel Sounding and not UWB (ultrawide-band)
UWB offers precision tracking, but requires a dedicated chip and antenna that adds to the cost. In contrast, Channel Sounding can deliver comparable results using standard Bluetooth hardware already present in most modern smartphones and wearables.
In essence, Google's approach offers the promise of precise, without the added cost or complexity of UWB. Important to note, the Pixel Watch 3 has the UWB hardware.
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