The Bluetooth Special Interest Group has officially released Bluetooth Core 6.3 as part of its twice-a-year update cycle, bringing a set of under-the-hood upgrades aimed at making Bluetooth more precise, more scalable, and more efficient in real-world hardware deployments.
One of the biggest changes focuses on ranging. According to the announcement, the new specification lets a reflector send phase-aligned signals directly to hardware, which improves the precision and efficiency of Bluetooth channel sounding. By cutting back on unnecessary data reporting, the update is also meant to reduce system overhead and speed up the overall process.
Another addition gives devices a more granular way to report round-trip-time accuracy. Instead of relying on a single shared value, products can now report RTT accuracy separately for each PHY. That should make physical-layer selection smarter in multi-PHY ranging scenarios and improve interoperability between devices using different link conditions.
The update also expands host controller interface capacity by increasing the size of supported command bit masks and LE event masks. In practical terms, that gives the platform more room to accommodate future features while still preserving backward compatibility with existing devices and software stacks.
On the radio side, Bluetooth Core 6.3 further aligns the RF requirements for Bluetooth Classic and Bluetooth Low Energy. The goal is to simplify design targets and enable a more power-efficient radio architecture without sacrificing performance. The SIG also reminded member companies not to market products by citing the core specification version alone. Instead, it says packaging and documentation should clearly describe the actual Bluetooth features a product supports, especially the ones most relevant to users.
