RADIO TELEPHONE SYSTEMS AND METHODS OF OPERATION

摘要

A radio telephone system is installed in an underground railway having adjacent railway stations (3, 4), served by respective base stations (1, 2) which also serve adjacent lengths of an interconnecting tunnel bore (5). When an underground train (8) travels from the area served by base station (1) to the area served by base station (2), a telephone call from a mobile telephone (14) on the train is handed over from base station (1) to base station (2). The setting up of the call on one channel between the mobile telephone (14) and the base station (1) causes the infrastructure of the telephone system to reserve the same channel at the next base station (2), ready for the call handover procedure to be effected.