Over the past twenty years Integra Systems, Inc. has been involved in the RTLS (Real Time Location System) space around the timing of the approval of 802.11b in 1999.
This has included but has not been limited to ultra wideband, Zigbee, ultrasound, Wi-Fi, low frequency RF, and UHF.
Our opinion with BTLE becoming the dominant PAN (personal area network) a lot has changed. What has moved the needle across the RTLS landscape was the smart phone validation as the standard incorporating BTLE. Add on to this the continued revolution of BTLE across multiple enterprise vertical markets.
Also the major WLAN manufactures are also now incorporating BTLE into their enterprise solutions both at the AP and WLAN controller for location based services.
Just like Wi-Fi becoming the standard in wireless networking; the same case is happening that BTLE 5.1 will become the standard for indoor RTLS.
According to ABI Research, over 400 million Bluetooth locations service devices are forecasted to be shipped per year 2022.
See the attached white paper: "Enhancing Bluetooth Location Services with Direction Finding"