Skimming through the article this looks like better signal processing coupled with the usual sensor
fusion (from accelerometers and other sensors).<p>My knowledge of location systems only extends so far, but from what I know 3G, 4G and WiFi have not
introduced anything particularly remarkable here.
Wifi APs and various BSs are used as beacons (a la Skyhook), but their role doesn&#x27;t extend
much beyond that.<p>Anyway, there is still hope that 5G or some IEEE standard will make a difference here.
They could perhaps provide something akin to a ground satellites, maybe at a very low frequency (to
get past obstacles), or&#x2F;and perhaps using UWB (helps with multipath, TOA determination).
And then maybe we would have zeroish-time-to-fix, indoor-location on cheap, low-power devices.