Connection establishment method and system and storage medium

The invention provides a connection establishment method and system and a storage medium, and the method comprises the steps that relay UE sends a discovery message to service UE in a terminal-to-terminal relay discovery process, the discovery message carries an indication parameter, and the indication parameter is used for representing a relay service authentication and authorization process indicated and supported by the relay UE; the traffic UE determines to use a relay service authentication and authorization procedure with or without network assistance based on the indication parameter. According to the invention, the discovery message carrying the indication parameter is sent to the service UE through the relay UE, so that the service UE determines to use a relay service authentication and authorization process with network assistance or without network assistance based on the indication parameter, and a network assistance and network assistance-free establishment mode can be provided for establishment