The present disclosure provides a communication control method, a controller, a user equipment, and a function instance that can meet quality of service requirements of services with different requirements. The communication control method includes: obtaining, by a controller, a first slice identifier corresponding to a first service; determining, by the controller according to the first slice identifier, a first function instance corresponding to the first slice identifier; and separately sending, by the controller, to a first user equipment (UE) and the first function instance, instruction information for setting up a bearer, where the bearer is used to transmit a data packet of the first service corresponding to the first UE, the bearer corresponds to the first slice identifier, and the instruction information carries an identity of the first UE and an identity of the first function instance.