A method for reporting a Packet Data Convergence Protocol, PDCP, status in a wireless communication system, performed by a wireless device and a base station, the method comprising: setting up a radio bearer that is mapped on one of a Radio Link Control, RLC, Unacknowledged Mode, UM, and an RLC Acknowledged Mode, AM, the RLC AM mode being a mode where the wireless device calculates an amount of downlink or uplink PDCP Service Data Units, SDUs, that are successfully received or transmitted by the wireless device based on both an RLC status Protocol Data Unit, PDU, and Hybrid Automatic Repeat reQuest, HARQ, feedback, the RLC UM mode being a mode where the wireless device calculates the amount of downlink or uplink PDCP SDUs that are successfully received or transmitted by the wireless device only based on HARQ feedback, the RLC UM being a mode that does not provide any retransmission; when the radio bearer is mapped on the RLC UM mode and is not mapped on the RLC AM mode, the radio bearer being a logical path that is mapped from a physical layer of the wireless device to an RLC layer of the wireless device; receiving, by the wireless device, a PDCP configuration via the radio bearer; receiving or transmitting, by the wireless device, at least one PDCP SDU via the radio bearer; and based on the received PDCP configuration, transmitting, by the wireless device, a PDCP status report for the radio bearer to the base station, the PDCP status report indicating which of the at least one PDCP SDU is missing, wherein the PDCP status report includes a first field indicating a Sequence Number, SN, of a first missing PDCP SDU and a second field indicating an SN of a first successfully received PDCP SDU, the method further comprises: calculating, by the base station, at least one missing PDCP SDU and at least one successful PDCP SDU based on the PDCP status report; and calculating, by the base station, a throughput and an error rate. setting up a radio bearer that is mapped on one of a Radio Link Control, RLC, Unacknowledged Mode, UM, and an RLC Acknowledged Mode, AM, the RLC AM mode being a mode where the wireless device calculates an amount of downlink or uplink PDCP Service Data Units, SDUs, that are successfully received or transmitted by the wireless device based on both an RLC status Protocol Data Unit, PDU, and Hybrid Automatic Repeat reQuest, HARQ, feedback, the RLC UM mode being a mode where the wireless device calculates the amount of downlink or uplink PDCP SDUs that are successfully received or transmitted by the wireless device only based on HARQ feedback, the RLC UM being a mode that does not provide any retransmission; when the radio bearer is mapped on the RLC UM mode and is not mapped on the RLC AM mode, the radio bearer being a logical path that is mapped from a physical layer of the wireless device to an RLC layer of the wireless device; receiving, by the wireless device, a PDCP configuration via the radio bearer; receiving or transmitting, by the wireless device, at least one PDCP SDU via the radio bearer; and based on the received PDCP configuration, transmitting, by the wireless device, a PDCP status report for the radio bearer to the base station, the PDCP status report indicating which of the at least one PDCP SDU is missing, wherein the PDCP status report includes a first field indicating a Sequence Number, SN, of a first missing PDCP SDU and a second field indicating an SN of a first successfully received PDCP SDU, the method further comprises: calculating, by the base station, at least one missing PDCP SDU and at least one successful PDCP SDU based on the PDCP status report; and calculating, by the base station, a throughput and an error rate. calculating, by the base station, at least one missing PDCP SDU and at least one successful PDCP SDU based on the PDCP status report; and calculating, by the base station, a throughput and an error rate.