A method for transmitting in a communication network uplink data from an application module in a user terminal. The method includes: determining, by said user terminal, if a correspondence exists between an application module providing at least one uplink packet and at least one rule designating a network slice instantiation to be used for transmitting uplink packets in the communication network; and in response to a determination by said user terminal that the application module providing at least one uplink packet corresponds to a rule designating a network slice instantiation to be used for transmitting the uplink packet in the communication network, transmitting said at least one uplink packet from the user terminal to an entity for access to a user plane of the designated network slice instantiation.