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2.1–2.3Lessons▼

• 2.1FRMCS end-to-end architecture

  You follow voice and data paths through the complete FRMCS architecture.

• 2.2Transport stratum: radio access and 5G Core

  You separate control functions from the user-data path in the 5G system.

• 2.3Spectrum, radio coverage and mobility

  You assess band support, coverage and handover separately.

• 2.4Service stratum: components and cooperation

  You map service components to responsibilities, states and dependencies.

• 2.5SIP and IMS in the FRMCS context

  You read a simplified SIP exchange and place IMS functions in context.

• 2.6MCX: service family and functional architecture

  You distinguish MCX services, common foundations and profile-specific scope.

• 2.7Identities, service registration and functional aliases

  You separate network identity, service access and operational assignment.

• 2.8MCPTT: following a voice call

  You explain a selected MCPTT call with participation, floor and media.

• 2.9MCData: following a data session

  You follow an MCData IPCon session from application request to termination.

• 2.10Priority and end-to-end QoS

  You connect service priority to transport treatment and a load test.

• 2.11On-board FRMCS, TOBA and application integration

  You explain on-board FRMCS, TOBA and the selected coupling variant.

• 2.12Trackside Gateway and trackside integration

  You explain application context, session handling and the data path at the Trackside Gateway.

• 2.13Dispatcher terminal and control-centre integration

  You follow Niko's call intention from the workstation to a usable service.

• 2.14Rail Application Server and railway-specific functions

  You classify a Rail Application Server by evidenced functions.

• 2.15Harmonised and non-harmonised applications

  You distinguish harmonisation status, interoperability, coupling and protection needs.

• 2.16ETCS over FRMCS

  You explain the selected ETCS communication chain over FRMCS.

• 2.17ATO over FRMCS

  You explain ATO communication partners and the boundary of FRMCS provision.

• 2.18Public mobile networks and roaming

  You distinguish public access, roaming, multipath and service access.

• 2.19Service domains and service continuity

  You follow transport- and service-domain transitions using separate states.

• 2.20Interworking Function: connecting FRMCS and GSM-R

  You explain IWF translation, limitations and impact on migration.

• 2.21Protection and lifecycle of communication services

  You connect service protection and availability with lifecycle cases.

• 2.22Final case: three communication paths

  You explain three complete communication paths and assign failures correctly.