I. Introduction
Researchers are starting to focus on the sixth generation (6G) wireless communication networks. 6G will have requirements of high time and phase synchronization accuracy and will have to provide near full geographical coverage, sub-centimetre geolocation accuracy and millisecond geo-location update rate to meet use cases [1], [2]. Three interesting categories for the upcoming technology, Intelligent Life, Intelligent Production and Intelligent Society, have been proposed in [3]. Health monitoring and primary diseases prevention, "informatization and networkization" in agriculture and industry, super transportation, universal public services and refined social governance fall into the mentioned categories as examples of applications. 6G expects to have many sensors, featuring at the same time massive MIMO deployment schemes, which will eventually evolve into radio stripes, deploying one antenna every few centimetres. This entails the management of huge data amounts for the provisioning of location services based on the footprint of the radio signal into the devices. Thousands of transmitters towards thousands of receivers creating fingerprint vectors of millions of elements.