Method for supporting indication of a failure event to a source access system

A target base station of a target radio access technology (RAT) system for executing a handover in a communication system, the target base station comprising:

• a transceiver configured to:
• receive, from a source base station of a source RAT system which is different from the target RAT system, source cell information of the source base station including E-UTRAN cell global identifier (CGI) and a tracking area identity (TAI) during handover preparation, and
• transmit a handover report including the ECGI to the source base station of the source RAT system when detecting that the source base station triggers an unnecessary inter-RAT handover to a target cell of the base station;
• and
• at least one processor configured to:
• detect that the source base station triggers the unnecessary inter-RAT handover, and
• control the transceiver,
• wherein the source cell information is used to identify the source cell for the unnecessary inter-RAT handover.

A method for executing a handover in a communication system, the method comprising:

• transmitting, by a source base station of a source radio access technology (RAT) system, to a target base station of a target RAT system which is different from the source RAT system, source cell information of the source base station including E-UTRAN cell global identifier (CGI) and a tracking area identity (TAD;
• triggering, by the source base station, an unnecessary inter-RAT handover to a target cell of the target base station;
• and
• receiving, by the source base station, from the target base station, a handover report including the ECGI,
• wherein the handover report is transmitted from the target base station when it is detected by the target base station that the source base station triggers an unnecessary inter-RAT handover to the target cell of the target base station, and
• wherein the source cell information is used to identify the source cell for the unnecessary inter-RAT handover.

A source base station of a source radio access technology (RAT) system for executing a handover in a communication system, the source base station comprising:

• a transceiver configured to:
• transmit, to a target base station of a target RAT system which is different from the source RAT system, source cell information of the source base station including E-UTRAN cell global identifier (CGI) and a tracking area identity (TAI) during handover preparation, and
• receive a handover report including the ECGI from the target base station;
• and
• at least one processor configured to:
• trigger the unnecessary inter-RAT handover, and
• control the transceiver,
• wherein the handover report is transmitted from the target base station when it is detected by the target base station that the source base station triggers an unnecessary inter-RAT handover to the target cell of the target base station, and
• wherein the source cell information is used to identify the source cell for the unnecessary inter-RAT handover.