Method and device for supporting configuration of time synchronization network in mobile communication network

A network side time synchronization network (TSN) translator (NW-TT) comprising:

• a plurality of ports comprising a first port and a second ports;
• and
• a processor configured to:
• control the first port of the plurality of the ports to receive a first announce message via user plane from a first device side TSN translator (DS-TT) using a first packet data unit (PDU) session between the NW-TT and the first DS-TT,
• control the second port of the plurality of the ports to receive a second announce message from a N6 interface,
• determine port states for each port of the first DS-TT and the NW-TT with the first announce message and the second announce message using a best master clock algorithm (BMCA) procedure,
• if grandmaster clock (GM) is external to a time synchronization network including the NW-TT and the first DS-TT, generating a third announce message based on the first announce message and the second announce message for each master port in the first DS-TT and the NW-TT, and
• control the first port of the plurality of the ports to transmit the third announce message to the first PDU session related to the master port in the first DS-TT.