The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for performing UL packet measurements in a wireless communication system, the method comprising: receiving a measurement configuration including a measurement period and a report unit from an eNB, performing an UL Packet Measurement per the report unit using the measurement period, and generating an UL Packet Measurement report including at least one ID of the report unit and at least one result of the UL Packet Measurement corresponding to the at least one ID of the report unit, and transmitting the UL Packet Measurement report to the eNB.