A method for selecting a network slice instantiation in a communication network for the transmission of uplink data from a user terminal. The method includes, subsequent to receipt of an uplink packet by a communication module of the user terminal, verification of a correspondence between this uplink packet and at least one rule designating a network slice instantiation able to transmit the uplink packet in the communication network and, when the uplink packet corresponds to a rule designating a network slice instantiation, transmission of the uplink packet to an entity for access to the user plane of the designated network slice instantiation.