A communication system for supporting communication between an end node of a vehicle and a remote correspondent node via a fixed network , the communication system comprising: a plurality of wireless access points of the fixed network , each wireless access point having a directional antenna arrangement for mm wave radio communication using directional beams; and characterised by comprising: a plurality of wireless modems arranged to establish mm wave radio communication links to wireless access points of the plurality of wireless access points , the mm wave radio communication links supporting a data session between the end node and the remote correspondent node , the plurality of wireless modems being located on the vehicle and employing electronically steerable beamforming directional antennas for establishing the mm wave radio communication links; wherein a first wireless modem of the plurality of wireless modems is arranged to establish a first mm wave radio communication link to a first access point of the plurality of access points using a first main beam being directed in a forward direction for the vehicle ; a second wireless modem of the plurality of wireless modems is arranged to establish a second mm wave radio communication link to a second access point of the plurality of access points using a second main beam being directed in a rearward direction for the vehicle; and the communication system further comprises: a link manager arranged to terminate the second mm wave radio communication link in response to a link failure for the first mm wave radio communication link, and to initialize setup of a third mm wave radio communication link between the second wireless modem and a candidate access point in response to the termination of the second mm wave radio communication link. a plurality of wireless modems arranged to establish mm wave radio communication links to wireless access points of the plurality of wireless access points , the mm wave radio communication links supporting a data session between the end node and the remote correspondent node , the plurality of wireless modems being located on the vehicle and employing electronically steerable beamforming directional antennas for establishing the mm wave radio communication links; wherein a first wireless modem of the plurality of wireless modems is arranged to establish a first mm wave radio communication link to a first access point of the plurality of access points using a first main beam being directed in a forward direction for the vehicle ; a second wireless modem of the plurality of wireless modems is arranged to establish a second mm wave radio communication link to a second access point of the plurality of access points using a second main beam being directed in a rearward direction for the vehicle; and the communication system further comprises: a link manager arranged to terminate the second mm wave radio communication link in response to a link failure for the first mm wave radio communication link, and to initialize setup of a third mm wave radio communication link between the second wireless modem and a candidate access point in response to the termination of the second mm wave radio communication link. <EOS>