Data transmission methods, network devices, computer-readable storage media, and communication systems

Abstract

The invention proposes a method for transmitting data, an access network device, a computer-readable storage medium, and a transmission system. The first access network device establishes a DRB (Data Radio Bearer) for both the first and second DRBs; the first access network device receives data packets forwarded from the second access network device; The first access network device maps to the first DRB; the data packets within the forwarded packets do not include the stream identifier, where the first DRB corresponds to the DRB of the second access network device; The first access network device maps to the second DRB based on the second mapping relationship; the data packets in the forwarded packets include the stream identifier, where the second mapping relationship is the mapping relationship between the stream and the DRB in the first access network device. 1 Therefore, the following problems are avoided: In the case of roaming or dual connection or other situations, data packets are lost or retransmitted because each accessing network device independently configures the mapping relationship between the stream and the DRB. This improves the continuity of the end-user service and improves communication quality.