RAN Rel-18: Requirements for Railway from UIC

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RAN Rel-18: Requirements for Railway from UIC

Ingo Wendler from the worldwide railway organisation, UIC, presented challenges and requirements in view of the upcoming Future Railway Mobile Communication System (FRMCS)*.


  • Limited spectrum in 900 MHz FDD and a need for lasting coexistence 
    • GSM-R is in operation and will remain operational alongside FRMCS
    • Railway's constraints imply to preserve at least 10-14 GSM-R carriers dependent on the traffic demands in specific railway environments.
    • Use case envisions co-location of GSM-R & FRMCS at similar power.

Study Item Objectives

  • Identify the range of channel bandwidths less than 5 MHz to meet regulatory spectrum block allocations (with limitation to FDD).
  • Identify limitations to NR physical layer to support narrowband channel bandwidth (i.e., channel design synchronisation, train speed);

FRMCS deployments in Europe will start in 2025.

  • The use of FRMCS, as opposed to the use of GSM-R, will increase significantly because it will also go hand in hand with the digitisation and automation of rail traffic.
  • The challenge is to coordinate the different roadmaps of the European countries in the rail ecosystem through technological adjustments (e.g., use of 5G NR).
  • The provision of the CBW <5MHz is a global initiative together with partners like Anterix, Qualcomm and Nokia.
  • Study proposal is an opportunity to design the 3GPP 5GS ecosystem for an even broader user community.

* Editorial note: 

GSM-R, Global System for Mobile Communications – Railway or GSM-Railway is an international wireless communications standard for railway communication and applications. It will be gradually replaced by FRMCS. 

Download the presentation here.

Requirements Tracking
Rail and Mobility
Mapping of Common Requirements
RAN Rel-18

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