"Looking to bridge and eventually transcend the world of traditional mobile networks with IP communications infrastructures ahead of the shutdown of 3G services in the country, leading Swiss national railway operator Schweizerische Bundesbahnen (SBB) has delivered what is claimed to be Europe's first live integration of legacy railway communications system GSM-R with an advanced IP Multimedia Subsystem (IMS) platform with voice over LTE (VoLTE) service using Ericsson technology."
"For years, voice roaming for Swiss rail communication relied on telco Swisscom's public 3G network in areas where GSM-R coverage was not available. GSM-R is the current standard for secure, reliable railway communications, supporting essential voice and data for train control and operations. With Swisscom's decision to decommission its 3G services, Swiss railway operators faced an urgent need to modernise."
Schweizerische Bundesbahnen (SBB) implemented a live integration of legacy GSM-R with an IP Multimedia Subsystem (IMS) platform and voice over LTE (VoLTE) using Ericsson technology. The deployment bridges rail-specific GSM-R functions with modern mobile and fixed telephony systems to maintain secure, nationwide communications across Switzerland's 3,100 km rail network. The move addresses the planned decommissioning of Swisscom's public 3G services by the end of 2025 and replaces reliance on 3G voice roaming where GSM-R coverage was absent. Approximately 1,000 trains received onboard 4G upgrades to enhance connectivity, resilience, and operational reliability. The solution aims to ensure uninterrupted end-to-end rail communications and to establish benchmarks for other European railway operators confronting legacy telecom shutdowns.
Read at ComputerWeekly.com
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