Embodiments of the present invention disclose a communication method and a device. The method includes: determining a first CU-UP and a UPF network element that correspond to a QoS flow, where an access network device to which the first CU-UP belongs supports at least two CU-UPs; determining a first PDB for transmitting the QoS flow between the first CU-UP and the UPF network element; and sending the first PDB to the access network device, where the first PDB is used by the access network device to schedule an air interface resource. In the embodiments of the present invention, after the CU-UP corresponding to the QoS flow is determined, the PDB of the CU-UP corresponding to the QoS flow may be sent to the RAN device.