A communication method, comprising: determining, by a session management network element, that a first session is a multi-access protocol data unit, MA-PDU, session, wherein data flows of the first session are transmitted on a data transmission channel of a first access technology and data transmission channels of a second access technology, the data transmission channels of the second access technology comprise a first data transmission channel and a second data transmission channel, an aggregation point of the data transmission channel of the first access technology and the first data transmission channel is a first user plane network element, and an aggregation point of the first data transmission channel and the second data transmission channel is an uplink classifier, UL CL; sending, by the session management network element, first indication information to the first user plane network element, wherein the first indication information is used to indicate the first user plane network element to determine a first aggregate maximum bit rate, AMBR, and the first AMBR is used by the first user plane network element to control one or more data flows that are in the data flows of the first session and that are transmitted on the data transmission channel of the first access technology; and sending, by the session management network element, second indication information to the UL CL, wherein the second indication information is used to indicate the UL CL to determine a second AMBR, and the second AMBR is used by the UL CL to control data flows that are in the data flows of the first session and that are transmitted on the data transmission channels of the second access technology. determining, by a session management network element, that a first session is a multi-access protocol data unit, MA-PDU, session, wherein data flows of the first session are transmitted on a data transmission channel of a first access technology and data transmission channels of a second access technology, the data transmission channels of the second access technology comprise a first data transmission channel and a second data transmission channel, an aggregation point of the data transmission channel of the first access technology and the first data transmission channel is a first user plane network element, and an aggregation point of the first data transmission channel and the second data transmission channel is an uplink classifier, UL CL; sending, by the session management network element, first indication information to the first user plane network element, wherein the first indication information is used to indicate the first user plane network element to determine a first aggregate maximum bit rate, AMBR, and the first AMBR is used by the first user plane network element to control one or more data flows that are in the data flows of the first session and that are transmitted on the data transmission channel of the first access technology; and sending, by the session management network element, second indication information to the UL CL, wherein the second indication information is used to indicate the UL CL to determine a second AMBR, and the second AMBR is used by the UL CL to control data flows that are in the data flows of the first session and that are transmitted on the data transmission channels of the second access technology.