From Concept to Reality: 5G Positioning with Open-Source Implementation of UL-TDoA in OpenAirInterface

TL;DR

This paper introduces the first open-source implementation of 3GPP UL-TDoA positioning in 5G networks using OpenAirInterface, validated through simulations and real-world tests, enabling accessible and precise user equipment localization.

Contribution

It provides a comprehensive, 3GPP-compliant open-source UL-TDoA implementation integrated into OAI's RAN and core network, facilitating research and development in 5G positioning.

Findings

Viability demonstrated through simulation and real-world testing.

Achieved precise UE positioning in diverse environments.

Open-source release promotes widespread adoption and innovation.

Abstract

This paper presents, for the first time, an open-source implementation of the 3GPP Uplink Time Difference of Arrival (UL-TDoA) positioning method using the OpenAirInterface (OAI) framework. UL-TDoA is a critical positioning technique in 5G networks, leveraging the time differences of signal arrival at multiple base stations to determine the precise location of User Equipment (UE). This implementation aims to democratize access to advanced positioning technology by integrating UL-TDoA capabilities into both the Radio Access Network (RAN) and Core Network (CN) components of OAI, providing a comprehensive and 3GPP-compliant solution. The development includes the incorporation of essential protocol procedures, message flows, and interfaces as defined by 3GPP standards. Validation is conducted using two distinct methods: an OAI-RF simulator-based setup for controlled testing and an O-RAN-based Localization Testbed at EURECOM in real-world conditions. The results demonstrate the viability of this open-source UL-TDoA implementation, enabling precise positioning in various environments. By making this implementation publicly available, the study paves the way for widespread research, development, and innovation in the field of 5G positioning technologies, fostering collaboration and accelerating the advancement of cellular network positioning.