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

Setting up and maintaining wireless communication connections with end user's terminals (301) on board a predictably moving vehicle (303) is shown with mechanisms for correcting for Doppler effects. A central device (302) within the vehicle (303) acts as a hub of a wireless network. There are a number of fixed transceivers (304). A connection arrangement (305, 306, 705, 706, 1001, 1101, 1122) connects the fixed transceivers (304) to an external packet-switched data network. The central device (302) within the vehicle (303) is a mobile router (302) equipped with routing capability (407). The connection arrangement (305, 306, 705, 706, 1001, 1101, 1122) includes a connection (705, 706, 1001) between a number of fixed transceivers (304) and a fixed central device (305) The fixed central device (305) has routing capability (1007), and together with the mobile router (302) implement routing of packets between the packet-switched network and an end user's terminal (301).