5G networks switch to island mode with faster crisis connectivity
Island-Ready Communication Networks: Connectivity Monitoring and State Synchronization for 5G Crisis Connectivity at the Edge
Networking and Internet Architecture
Summary
Sometimes during a crisis, people lose access to the Internet because networks get cut off. The authors work on making 5G networks that can keep working locally by switching to an "island mode" that doesn't rely on the global Internet. They focus on two big challenges: how to keep all parts of the network in sync and how to monitor connectivity. They tested their approach on a large simulated 5G network and found that most delay happens when changing the local access and that data traffic for synchronization grows quickly with more network cores.
What this means in practice
- •For emergency communication planners: Set up 5G networks that maintain local service during Internet outages by managing connectivity and synchronizing core network state efficiently.
- •For telecom network operators: Design edge deployments that reduce downtime when switching to island mode by optimizing access network reconfiguration and synchronization overhead.
Authors
Leon Janzen, Maria Koch, Matthias Hollick
Abstract
Island-ready 5G deployments provide edge connectivity for isolated regions in crisis scenarios by switching to island operation when they are cut off from the global Internet. This work addresses open research challenges that hinder the practical realization of island readiness, with a focus on the required state synchronization and connectivity monitoring functionality. As a proof of concept and for performance evaluation, we integrate our solutions in open-source projects and emulate a country-wide 5G communication network with real-world cellular traffic. Our evaluation studies the switching latency of transitions to island operation, showing that most of the transition delay stems from the access network reconfiguration. We study the synchronization overhead of a highly distributed core network, finding that the synchronization traffic grows faster than linearly with the number of 5G cores, reaching peak synchronization data rates of 9.36MB/s for a deployment of 50 cores.