Study on application architecture for the Future Railway Mobile Communication System (FRMCS); Stage 2
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 3GPP TS 23.379 [3] (MCPTT), 3GPP TS 23.280 [4] (Common functional architecture), 3GPP TS 23.281 [5] (Mission Critical Video) and 3GPP TS 23.282 [6] (Mission Critical Data) into account. Studies on migration and interconnection (3GPP TR 23.781 [7]) and interworking between LTE and non-LTE systems (3GPP TR 23.782 [8]) are considered.