A control method and device, SMF, UPF, UE, PCF, and AN are provided. It relates to the field of communications, and solves the problem that the network cannot perform QoS control on unstructured data packets in related art. The control method includes: when establishing a session for transferring unstructured data for a user equipment, determining indication information related to a QoS of the session; transmitting the indication information to a target node, determining, by the target node, a QoS corresponding to the session according to the indication information. The target node can determine the QoS of the session for transferring unstructured data according to the indication information sent by the SMF, thereby realizing the QoS control of unstructured data packets by the network, and ensuring the QoS of the unstructured data transmission and improving network performance.