What is the easiest method for determining location?

Question

Bluetooth

What is the easiest way to get the location of the device (using wi-fi routers, iBeacon tags or other methods) inside the building (the layout is known in advance, there will be many devices, therefore interference too), with maximum accuracy, the number of tags or access points is unlimited.
For example, arrange several wi-fi points and make fingerprints or put a lot of bluetooth tags and, again, determine the location with fingerprints.
What can be read about this?

Answer 1

Если внутри здания, то вижу выход только в iBeacon