A method includes receiving, by an access gateway device, a fixed network packet included in a first fixed network session. The fixed network packet includes fixed network session characteristic information useable to identify the fixed network packet. The method further includes sending, by the access gateway device, the fixed network packet to a user plane function network element based on information of a first interface corresponding to the fixed network session characteristic information. The first interface is an interface between the access gateway device and the user plane function network element. The method further includes receiving, by the user plane function network element, the fixed network packet.