Data transmission method and system

Abstract

The invention provides a data transmission method and system, and the method comprises the steps: obtaining a plurality of PDCP SDUs in a PDCP layer, and a buffer available memory of the PDCP layer; determining a congestion condition according to the buffer available memory of the PDCP layer, the buffer total memory of the PDCP layer and the memory occupied by a plurality of timeout PDCP SDUs; determining to send a control instruction to an application layer according to whether the congestion condition is satisfied; and by the application layer, updating the transmission rate of transmitting the PDCP SDU to the PDCP layer according to the control instruction. According to the invention, the transmission rate of transmitting the PDCP SDU from the application layer to the PDCP layer is continuously adjusted according to whether the PDCP layer is congested or not. According to the invention, it can be ensured that the serial numbers of the PDCP SDUs received by the receiving end during data transmission are continuous, and the wireless resource overhead is reduced.

Description

technical field [0001] The invention relates to the field of data transmission, in particular to a data transmission method and system. Background technique [0002] During the uplink data transmission process of the NR (New Radio, new radio access technology) network, when the data transmission rate generated by the terminal application is higher than the transmission rate of the air interface, the application layer or the transmission layer does not know and maintains the original speed to the PDCP (Packet Data Convergence Protocol, packet data convergence protocol) layer transmission of data will increase the congestion of the base station, which may eventually lead to buffer overflow and a large number of packet loss, or cause the application layer or transport layer to not retransmit in time, resulting in excessive transmission delay. [0003] In order to avoid this situation, in the data transmission of the radio bearer, when the PDCP layer receives a PDCP SDU (PacketD...

AI Technical Summary

Problems solved by technology

However, this active packet loss method will lead to discontinuity of PDCP SN (Packet Data Convergence Protocol Serial Number, packet data convergence protocol serial number), and the application layer retransmits the data of the lost PDCP SDU at the PDCP layer. The PDCP SDU received for the first time is reordered according to the PDCP SN, which wastes a lot of time and cost. In addition, when a large amount of data is lost, the transmission will even be terminated, so that all data needs to be retransmitted, resulting in wireless resource overhead.

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