Data transmission method, access network equipment, terminal and communication system

Abstract

The invention provides a data transmission method, access network equipment, a terminal and a communication system. The data transmission method comprises the following steps: first access network equipment establishes a first data radio bearer (DRB) and a second DRB; the first access network equipment receives forwarded data packets from second access network equipment; the first access network equipment maps data packets not containing flow identifiers in the forwarded data packets to the first DRB, wherein the first DRB corresponds to a DRB of the second access network equipment; and the first access network equipment maps data packets containing flow identifiers in the forwarded data packets to the second DRB according to a second mapping relation, wherein the second mapping relation is the mapping relation between flows and the DRBs in the first access network equipment. Accordingly, the problem of data packet loss or repeat packet sending caused by the fact that each access network is independently configured with a mapping relation between the flows and the DRBs in a handover or dual connection scene is avoided, and the terminal service continuity and the communication quality are improved.

Description

technical field [0001] The present application relates to the field of wireless communication, in particular to a data transmission method, an access network device, a terminal and a communication system. Background technique [0002] With the continuous improvement of user needs, the research on new radio access network (New RAN) is getting more and more in-depth. Compared with the existing wireless communication system, the new radio access network can provide shorter delay , greater bandwidth, and supports a large number of connections to meet the growing needs of mobile communications. [0003] In the new wireless access network, quality of service (QoS) management is based on flow (flow), including establishing a protocol data unit (protocol data unit, PDU) session between the access network device and the core network, The PDU session may include multiple streams, and different streams may have different QoS requirements. The core network provides the QoS requirements...

AI Technical Summary

Problems solved by technology

Since the target base station and the source base station will configure different mapping relationships between streams and DRBs, problems such as packet loss and repeated packet transmission will occur during the transmission of terminal data packets to the target base station or subsequent air interface transmission, which will affect the communication continuity of the terminal

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