Method, system and arrangements for setting up and maintaining a WLAN connection within predictably moving vehicles

Acommunication system is disclosed for setting up and maintaining wireless communication connections with end user's terminals on board a predictably moving vehicle. A central device within the vehicle acts as a hub of a wireless network. There are a number of fixed transceivers. A connection arrangement connects the fixed transceivers to an external packet-switched data network. The central device within the vehicle is a mobile router equipped with routing capability. The connection arrangement comprises an optical connection between a number of fixed transceivers and a fixed central device, which optical connection goes through an optical fibre or a small number of optical fibres taken from a long-distance optical cable running along a predicted route of movement of the vehicle. Said fixed central device has routing capability, and said fixed central device together with said mobile router implement routing of data packets between the packet-switched data network and an end user's terminal.