Methods for performing a handover in wireless communications for a user plane function (UPF) are disclosed. In an aspect, the method includes establishing a tunnel between the UPF and a target base station based on information in a path switch preparation request for a make before break handover of a user equipment (UE) from a source base station to the target base station, the path switch preparation request being received in response to a request originating by the target base station. The method further includes bi-casting a downlink data packet unit (PDU) to a source base station and to the target base station with a same sequence number (SN) in a tunnel protocol, receiving PDUs from the source base station and the target base station with corresponding PDUs having the same SNs in the tunnel protocol and discarding received duplicate PDUs based on the SNs in the tunnel protocol.

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for processing a PDCP SDU in a dual connectivity system, the method comprising: receiving a PDCP SDU (Packet Data Convergence Protocol Service Data Unit) from a upper layer; starting a timer associated with the PDCP SDU; checking whether a certain condition related to the PDCP SDU process is satisfied or not if the timer expires; and discarding the PDCP SDU if the certain condition related to the PDCP SDU process is satisfied.

A method and apparatus for processing a plurality of data packets. A data packet is received. A determination is made as to whether a portion of the data packet follows a selected digital recorder standard protocol based on a header of the data packet. Raw data in the data packet is converted into human-readable information in response to a determination that the portion of the data packet follows the selected digital recorder standard protocol.