Indoor Positioning in 5G-Advanced: Challenges and Solution towards Centimeter-level Accuracy with Carrier Phase Enhancements (2209.01183v3)
Abstract: After robust connectivity, precise positioning is evolving into an innovative component of 5G service offerings for industrial use-cases and verticals with challenging indoor radio environments. In this direction, the 3GPP Rel-16 standard has been a tipping point in specifying critical innovations, followed by enhancements in Rel-17 and Rel-18. In this article, we elaborate on the 5G positioning framework, measurements, and procedures before shifting the focus mainly to recently identified carrier-phase (CP) measurements in Rel-18 as a complementary measure for time- and angular-based positioning methods. We discuss the associated challenges and potential solutions for exploiting CP, including integer ambiguity, multipath sensitivity, and signaling aspects. Furthermore, we study how phase-continuous reference signaling can counter noisy phase measurements using realistic simulations to achieve centimeter-level accuracy in indoor factory (InF) scenarios.
- S. Dwivedi et al., “Positioning in 5G networks,” IEEE Commun. Mag., vol. 59, no. 11, pp. 38–44, 2021.
- 3GPP WID RP-222616, “Revised SID on study on expanded and improved NR positioning,” Sept. 2022.
- 3GPP TR 38.857, “Study on NR positioning enhancements,” Mar. 2021.
- A. Fouda et al., “Toward cm-level accuracy: Carrier phase positioning for IIoT in 5G-advanced NR networks,” in IEEE PIMRC, 2022.
- K. Shamaei et al., “Receiver design and time of arrival estimation for opportunistic localization with 5G signals,” IEEE Trans. Wireless Commun., vol. 20, no. 7, pp. 4716–4731, 2021.
- Z. Zhang et al., “Indoor carrier phase positioning technology based on OFDM system,” Sensors, vol. 21, no. 20, 2021.
- 3GPP Tdoc R1-2104844, “Carrier phase based downlink angle of departure measurement,” May 2021.
- O. Kanhere et al., “Position location for futuristic cellular communications: 5G and beyond,” IEEE Commun. Mag., vol. 59, no. 1, pp. 70–75, 2021.
- S. Fan et al., “Carrier phase-based synchronization and high-accuracy positioning in 5G new radio cellular networks,” IEEE Trans. Commun., vol. 70, no. 1, pp. 564–577, 2022.
- F. Mogyorósi et al., “Positioning in 5G and 6G networks—A survey,” Sensors, vol. 22, no. 13, p. 4757, 2022.
- X. Li, “Gnss repeater based differential indoor positioning with multi-epoch measurements,” IEEE Transactions on Intelligent Vehicles, vol. 8, no. 1, pp. 803–813, 2023.
- 3GPP Tdoc R1-2104880, “Carrier/subcarrier phase based enhancement for 5G NR positioning,” May 2021.
- 3GPP Tdoc R1-2104909, “Mitigation of NLOS problem for NR positioning,” May 2021.
- D. Tso et al., “D-DMTD: Digital dual mixer time difference,” Sandia National Laboratories, Report SAND2017-10097, August 2017.
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