tive specification work to support NTN, based on the outcome of the studies described in this section. This initial normative work to be done in Release-17 should cover some of the scenarios outlined above, specifically: GEO, LEO, and HAPS; Transparent payload only (formally this implies that a gNB is deployed on a ground sta- tion, however the same system most likely will be able to support gNBs deployed on a satellite); UEs with GNSS; Satellite-specific RRM requirements. References 3GPP R1-1904225 (2019). Timing Advance Adjustments for Satellite Communications (NTN), Fraunhofer IIS, Fraunhofer HHI, 3GPP TSG-RAN WG1 Meeting #96bis, Xi'an, April 2019. 3GPP R1-1904650 (2019). Doppler Compensation, Uplink Timing Advance, Random Access and UE Location in NTN, Nokia, Nokia Shanghai Bell, 3GPP TSG RAN WG1 Meeting #96bis, Xi'an, China, April 2019. 3GPP R2-1817757 (2018). NR-NTN: HARQ in Satellite Systems, Fraunhofer IIS, Fraunhofer HHI, 3GPP TSG-RAN WG2 Meeting #104, Spokane, November 2018. References 3GPP R2-1818050 (2018). Satellite Ephemeris Data and their Use for Handover Decisions between Satellites, Hughes, 3GPP TSG-RAN WG2 Meeting # 104, Spokane, USA, November 2018. 3GPP R2-1818510 (2018). Initial Random Access Procedure in Non-Terrestrial Networks (NTN), Nomor Research GmbH, 3GPP TSG-RAN WG2 Meeting # 104, Spokane, USA, November 2018. 3GPP R2-1818511 (2018). Considerations on MAC Timers and on RTD Compensation Offset in Non-Terrestrial Networks (NTN), Nomor Research GmbH, 3GPP TSG-RAN WG2 Meeting # 104, Spokane, USA, November 2018. 3GPP R2-1818512 (2018). Considerations on RLC Control Loops and Timings in Non-Terrestrial Networks (NTN), Nomor Research GmbH, 3GPP TSG-RAN WG2 Meeting # 104, Spokane, USA, November 2018. 3GPP R2-1818513 (2018). Considerations on PDCP Control Loops and Timings in Non-Terrestrial Networks (NTN), Nomor Research GmbH, 3GPP TSG-RAN WG2 Meeting # 104, Spokane, USA, November 2018. 3GPP R2-1818514 (2018). Considerations on SDAP in Non-Terrestrial Networks (NTN), Nomor Research GmbH, 3GPP T