| CPC H04W 4/40 (2018.02) [H04W 8/22 (2013.01); H04W 76/14 (2018.02)] | 14 Claims |

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1. A method for performing unicast communication by a first user equipment (UE), the method comprising:
transmitting a request message for establishing a PC5 unicast link, the request message including information about a PC5 Quality of Service (QoS) Flow;
receiving, from a second UE, a response message for establishing the PC5 unicast link, the response message including including a corresponding information about the PC5 QoS Flow requested by the first UE; and
transmitting, to the second UE, a data 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 5G QoS Indicator (PQI), or a PC5 QoS Flow Identifier (PFI) associated with the PQI.
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