Method and communications apparatus for transmitting data packets of a media stream

A method for transmitting a data packet of a media stream, comprising:

• receiving, by an access network element, M data packets of a media stream from a user plane network element, wherein M is a positive integer, and each of the M data packets carries a sequence number representing a sending sequence of a corresponding data packet;
• when a network resource of the access network element cannot satisfy a transmission requirement of a terminal device, dropping, by the access network element, N data packets in the M data packets, wherein N≤M, N is a positive integer, and priorities of the N data packets are lower than priorities of other data packets in the M data packets;
• sending, by the access network element to the terminal device, a data packet in the M data packets that is not dropped and sequence numbers carried in the N data packets;
• and
• receiving, by the access network element from the terminal device, an acknowledge (ACK) feedback for the sequence numbers carried in the N data packets.