The railway community is considering a successor to GSM-R with first FRMCS trial implementations expected to start
The Future Railway Mobile Communication System (FRMCS) functional working group of the International Union of
Railways (UIC) have investigated and summarised their requirements for the next generation railway communication
system in the Future Railway Mobile Communication User Requirement Specification (URS). The requirements
have been shared with 3GPP.
The present document identifies gaps between the FRMCS requirements and stage 2 mission critical services
specifications. For those gaps that cannot be fulfilled by the existing architecture, functional architecture enhancements,
new procedures and information flows are documented and suggested as candidates for normative specifications.
The study takes existing 3GPP functionality and those specified for Mission Critical Communication in normative
specifications TS 23.379
(Common functional architecture), 23.281
(Mission Critical Video) and TS 23.282
(Mission Critical Data) into account. Studies on migration and
interconnection (TR 23.781
) and interworking between LTE and non-LTE systems (TR 23.782