Procedure for handover from a UMTS radio network to a GSM radio network, including the steps to; - for each connection between a user equipment and a base station (Node B) in the UMTS radio network initiate a state model including a start state (NO_IRAT_MEAS), an uplink state (IRAT_MEAS_UL), a downlink state (IRAT_MEAS_DL), an up-/downlink state (IRAT_MEAS_UL/DL), and a handover state (IRAT_HO), - in the start state execute power measurements and change to the uplink state if the power of the user equipment exceeds a threshold value, or to the downlink state if the power of the base station exceeds a threshold value, - in the uplink state or in the downlink state execute a new power measurement and threshold check for the user equipment respective base station, and check if received signal strength in a GSM neighbor cell list exceeds a threshold value, and from there a) either go to the handover state (K,N) if both measured output power and received signal strength exceeds respective threshold value, or b) go to the up-/downlink state if measurement report is coming in, in the uplink state, that the output power of the base station exceeds its threshold value, or if measurement report is coming in, in the downlink state that the output power of the user equipment exceeds its threshold value, - in the uplink-/downlink state execute new power measurements and threshold check for the user equipment and base station, and check if received signal strength in a GSM neighbor cell list exceeds a threshold value, and if all threshold values are exceeded, go to the handover state, - in the handover state a Radio Network Controller communicates with a Base Station Controller to reserve resources for a connection, and if this succeeds, transmit a HANDOVER FROM UTRAN COMMAND to the user equipment to execute handover, and if the user equipment fails to get into contact with the GSM network, and a handover by that is not possible, the procedure will proceed in the state in the state model that preceded the handover state (L,M,P). - for each connection between a user equipment and a base station (Node B) in the UMTS radio network initiate a state model including a start state (NO_IRAT_MEAS), an uplink state (IRAT_MEAS_UL), a downlink state (IRAT_MEAS_DL), an up-/downlink state (IRAT_MEAS_UL/DL), and a handover state (IRAT_HO), - in the start state execute power measurements and change to the uplink state if the power of the user equipment exceeds a threshold value, or to the downlink state if the power of the base station exceeds a threshold value, - in the uplink state or in the downlink state execute a new power measurement and threshold check for the user equipment respective base station, and check if received signal strength in a GSM neighbor cell list exceeds a threshold value, and from there a) either go to the handover state (K,N) if both measured output power and received signal strength exceeds respective threshold value, or b) go to the up-/downlink state if measurement report is coming in, in the uplink state, that the output power of the base station exceeds its threshold value, or if measurement report is coming in, in the downlink state that the output power of the user equipment exceeds its threshold value, a) either go to the handover state (K,N) if both measured output power and received signal strength exceeds respective threshold value, or b) go to the up-/downlink state if measurement report is coming in, in the uplink state, that the output power of the base station exceeds its threshold value, or if measurement report is coming in, in the downlink state that the output power of the user equipment exceeds its threshold value, - in the uplink-/downlink state execute new power measurements and threshold check for the user equipment and base station, and check if received signal strength in a GSM neighbor cell list exceeds a threshold value, and if all threshold values are exceeded, go to the handover state, - in the handover state a Radio Network Controller communicates with a Base Station Controller to reserve resources for a connection, and if this succeeds, transmit a HANDOVER FROM UTRAN COMMAND to the user equipment to execute handover, and if the user equipment fails to get into contact with the GSM network, and a handover by that is not possible, the procedure will proceed in the state in the state model that preceded the handover state (L,M,P).