US Patent 7359355 Method for transferring intersystem connections

To transfer intersystem connections, the quality of a transfer to a supplying base station in a first radiocommunication system is determined at a given moment by a subscriber station and compared to a threshold value. If the value falls below said threshold, a compressed mode is activated and measurements are carried out by the subscriber station in relation to the transfer qualities to neighboring base stations in a second radiocommunication network. On the basis of said measurements, the subscriber station selects a base station for the transfer of a connection. If the value falls below the second threshold, information sequences in the organization channels of the selected base stations are detected by the subscriber station.