Patent ID: 8880078

Claim:
A method of transmitting a measurement result performed by a user equipment (UE) in a wireless communication system, the method comprising: receiving, from a network, a measurement configuration; receiving, from the serving cell, a RRC connection reconfiguration message related to a handover, the RRC connection reconfiguration message comprising a predetermined timer value; starting a T304 timer with a timer value set to the predetermined timer value; determining a handover failure if a random access procedure is not completed until the T304 timer is expired; storing handover failure information, if it is determined that the handover failure occurs; and transmitting the handover failure information to a network, wherein the handover failure information comprises a measurement result of the serving cell based on measurements collected up to the moment of the occurrence of the handover failure, and a measurement result of at least one neighbor cell based on measurement collected up to the moment of the occurrence of the handover failure.