Patent ID: 7359355

Claim:
A method for controlling an intersystem connection transfer from a first radiocommunication system having a first transmission method to a second radiocommunication system having a second transmission method, comprising: in a first step, determining a transmission quality at a subscriber station, with respect to transmission characteristics from the subscriber station to a supplying base station of the first radiocommunication system; comparing the transmission quality with a first threshold value; activating a compressed mode if the transmission quality falls below the first threshold value, the compressed mode generating at least one transmission gap in a time frame of the first transmission method; determining transmission characteristics at the subscriber station with respect to a base station of the second radiocommunication system within the at least one transmission gap; comparing the transmission quality with a second threshold value; in a subsequent second step, detecting, at the subscriber station, information sequences transmitted by the base station of the second radiocommunication system in a control channel only if the transmission quality with respect to transmission characteristics from the subscriber station to the supplying base station of the first radiocommunication system falls below the second threshold; and selecting the base station of the second radio communication system for the connection transfer on the basis of the determined transmission characteristics and the detected information sequences.