1. A method for providing on-demand quality-of-service for a data connection of a user equipment to a 3GPP data access network, this method comprising a sending step ( 1 , 2 ), during the attach procedure of the user equipment to the 3GPP data access network, of a message from the user equipment to the 3GPP data access network, this message including an access point name, this access point name comprising an explicit quality-of-service request being requested by the user equipment for the data connection, this explicit quality-of-service request being formatted in a predefined syntax.