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I think trains are kind of a special case in telephony when it comes to handoffs. It’s a unique situation where you have hundreds and hundreds of UEs[0] having

by teeray 5y ago

I think trains are kind of a special case in telephony when it comes to handoffs. It’s a unique situation where you have hundreds and hundreds of UEs[0] having to detach and re-attach, which makes for a very busy MME[1]. Sometimes those phones are only briefly connected to a given eNB[2] too, which makes all that effort for naught. [0] Phones [1] The system which sits immediately behind cell towers and coordinates handoffs [2] Tower

exikyut 5y ago
The canonical solution in train/subway/metro systems seems to be full-length antennas that span the tunnel corridor. The cool solution would be base stations built into train carriages that then uplink through some kind of backhaul. I think (but need to properly evaluate) that some Australian trains use something like this. EDIT: Nooope nope nope, horribly misread. https://goughlui.com/2014/03/23/random-post-railcorp-gsm-r-rollout-opal-stuff-and-other-observations/ https://goughlui.com/2014/03/23/random-post-railcorp-gsm-r-r...