A method performed by a wireless device in a wireless communication system, the method comprising: receiving, from a source cell, a measurement configuration; receiving a first handover command for a dual active protocol stack, DAPS, handover to a target cell; triggering the DAPS handover to the target cell based on the first handover command, while maintaining configurations of the source cell until release of the source cell; detecting a failure of the DAPS handover to the target cell; and after detecting the failure of the DAPS handover: transmitting, to the source cell, information for the failure of the DAPS handover; obtaining radio resource management, RRM, measurement results for one or more neighbor cells based on the measurement configuration received from the source cell; transmitting, to the source cell, a measurement report comprising the RRM measurement results for the one or more neighbor cells based on a condition for transferring the RRM measurement results being satisfied for the one or more neighbor cells; receiving, from the source cell, a second handover command for a neighbor cell; triggering a handover to the neighbor cell as a target cell based on the second handover command; and transmitting a handover complete message based on the handover to the neighbor cell being successful. receiving, from a source cell, a measurement configuration; receiving a first handover command for a dual active protocol stack, DAPS, handover to a target cell; triggering the DAPS handover to the target cell based on the first handover command, while maintaining configurations of the source cell until release of the source cell; detecting a failure of the DAPS handover to the target cell; and after detecting the failure of the DAPS handover: transmitting, to the source cell, information for the failure of the DAPS handover; obtaining radio resource management, RRM, measurement results for one or more neighbor cells based on the measurement configuration received from the source cell; transmitting, to the source cell, a measurement report comprising the RRM measurement results for the one or more neighbor cells based on a condition for transferring the RRM measurement results being satisfied for the one or more neighbor cells; receiving, from the source cell, a second handover command for a neighbor cell; triggering a handover to the neighbor cell as a target cell based on the second handover command; and transmitting a handover complete message based on the handover to the neighbor cell being successful. transmitting, to the source cell, information for the failure of the DAPS handover; obtaining radio resource management, RRM, measurement results for one or more neighbor cells based on the measurement configuration received from the source cell; transmitting, to the source cell, a measurement report comprising the RRM measurement results for the one or more neighbor cells based on a condition for transferring the RRM measurement results being satisfied for the one or more neighbor cells; receiving, from the source cell, a second handover command for a neighbor cell; triggering a handover to the neighbor cell as a target cell based on the second handover command; and transmitting a handover complete message based on the handover to the neighbor cell being successful.