Apparatus and method for supporting one-to-one communication service in wireless communication system

A first user equipment (UE) for performing unicast communication, the first UE comprising:

• a transceiver;
• and
• at least one processor coupled with the transceiver and configured to:
• transmit a direct communication request message including information about a PC5 Quality of Service (QoS) Flow for establishing a PC5 unicast link;
• receive, from a second UE, a response message including a corresponding information about the PC5 QoS Flow requested by the first UE based on a result of an establishment of a the PC5 unicast link;
• and
• transmit, to the second UE, a data message over the PC5 unicast link by using a profile for the PC5 unicast link,
• wherein the information about PC5 QoS Flow includes a PC5 QoS Flow identifier (PFI) and a PC5 5th generation (5G) QoS Indicator (PQI), and
• wherein the profile includes at least one of:
• a Layer-2 identifier (ID) of the first UE, an application layer ID of the first UE, a Layer-2 ID of the second UE, an application layer ID of the second UE, a PC5 5th generation (5G) Quality of Service (QoS) Indicator (PQI), or a PC5 QoS Flow identifier (PFI) associated with the PQI.