Navigation using Positioning Reference Signal in 6G Non -Terresterials-Newtorks (NTN)

6G NTN Non-Terrestrial Network is destined to revolutionize wireless communications and user wireless positioning. It promises not only higher throughput and broader frequency band operations but also enhanced services, including improved localization capabilities. It will also improve services, including enhanced localization services. While 6G systems will continue to evolve and serve different user markets, the 3GPPdefined NTN standard allows for the integration of non-terrestrial components into existing 5G systems, thereby expanding service coverage to underserved or unserved areas. Since Release 15, 3GPP has been defining and standardizing positioning solutions for terrestrial 5G networks to meet various requirements. Positioning signals, standardized by 3GPP, are already used in terrestrial 5G communication networks. With the introduction of non-terrestrial 5G communication networks in Release 17, 3GPP is now focusing on 6G cellular networks under Release 20. This paper reviews the state of 5G positioning and localization, highlights existing challenges, and proposes a signal derived from terrestrial networks for future localization in 6G NTN networks.