Method and device for supporting self-configuration and self-optimization

A method of a third base station in a wireless communication system, the method comprising:

• receiving, from a user equipment (UE), an UE information response message including a radio link failure (RLF) report;
• and
• transmitting, to a second base station where an RLF associated with a mobility failure for a voice fallback is occurred, the RLF report including voice fallback indication information on the mobility failure for the voice fallback,
• wherein the RLF associated with the mobility failure for the voice fallback is detected by the UE, and
• wherein the voice fallback is associated with a handover of the UE from a first base station supporting a new radio (NR) to the second base station supporting an evolved-universal mobile telecommunications system terrestrial radio access network (E-UTRA).

A method of a second base station where a radio link failure (RLF) associated with a mobility failure for a voice fallback is occurred in a wireless communication system, the method comprising:

• receiving, from a third base station, an RLF report including voice fallback indication information on the mobility failure for the voice fallback;
• and
• detecting a cause of the RLF associated with the mobility failure for the voice fallback,
• wherein the RLF associated with the mobility failure for the voice fallback is detected by a user equipment (UE), and
• wherein the voice fallback is associated with a handover of the UE from a first base station supporting a new radio (NR) to the second base station supporting an evolved-universal mobile telecommunications system terrestrial radio access network (E-UTRA).

A user equipment (UE) in a wireless communication system, the UE comprising:

• a transceiver;
• and
• a processor configured to:
• detect a radio link failure (RLF) associated with a mobility failure for a voice fallback, wherein the voice fallback is associated with a handover of the UE from a first base station supporting a new radio (NR) to a second base station supporting an evolved-universal mobile telecommunications system terrestrial radio access network (E-UTRA),
• store voice fallback indication information on the mobility failure for the voice fallback in an RLF report, and
• transmit, to a third base station, an UE information response message including the RLF report.

A third base station in a wireless communication system, the third base station comprising:

• a transceiver;
• and
• a processor configured to:
• receive, from a user equipment (UE), an UE information response message including a radio link failure (RLF) report,
• transmit, to a second base station where an RLF associated with a mobility failure for a voice fallback is occurred, the RLF report including voice fallback indication information on the mobility failure for the voice fallback,
• wherein the RLF associated with the mobility failure for the voice fallback is detected by the UE, and
• wherein the voice fallback is associated with a handover of the UE from a first base station supporting a new radio (NR) to the second base station supporting an evolved-universal mobile telecommunications system terrestrial radio access network (E-UTRA).

A second base station where a radio link failure (RLF) associated with a mobility failure for a voice fallback is occurred in a wireless communication system, the method comprising:

• a transceiver;
• and
• a processor configured to:
• receive, from a third base station, an RLF report including voice fallback indication information on the mobility failure for the voice fallback, and
• detect a cause of the RLF associated with the mobility failure for the voice fallback,
• wherein the RLF associated with the mobility failure for the voice fallback is detected by a user equipment (UE), and
• wherein the voice fallback is associated with a handover of the UE from a first base station supporting a new radio (NR) to the second base station supporting an evolved-universal mobile telecommunications system terrestrial radio access network (E-UTRA).