data transfer method

Abstract

The invention relates to the technical field of communication, and discloses a data transmission method. In the present invention, the data transmission method includes the following steps: before the terminal side obtains the uplink grant (UL GRANT) for resource scheduling on the network side, preprocess all transmission control protocol TCP confirmation ACK packets and some TCP data packets in the uplink packet , after obtaining the UL GRANT, process the remaining TCP data packets in the uplink packet in real time. In this way, the interference of sending TCP data packets on sending TCP ACK packets can be eliminated, so that the uplink service does not affect the downlink service rate.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a data transmission method. Background technique [0002] When the uplink and downlink are concurrent, the transmission of the uplink TCP (Transmission Control Protocol) data packet of the uplink service will interfere with the transmission of the uplink TCP ACK (acknowledgment) packet triggered by the downlink service, resulting in an increased delay in sending the TCP ACK packet, and the TCP RTT ( (round-trip transmission time) delay increases, and the corresponding downlink rate decreases; if the TCP ACK packet transmission delay jitters, the TCP RTT delay jitters, and the corresponding downlink rate jitters. Among them, the transmission process of TCP data packet and TCP ACK packet is as follows: figure 1 As shown, 101 is a TCP data packet, and 102 is a TCP ACK packet. [0003] Both the uplink TCP ACK packets and TCP data packets of the UE (terminal) are buffered in ...

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of method (1) is that it requires high processing capability of the UE, and usually cannot meet the real-time requirements of processing and sending a large number of TCP ACK packets on a network-side resource scheduling UL GRANT.

[0007] The defect of method (2) is that the Packet Data Convergence Sublayer (PDCP) of the data link layer will number and encrypt each packet (uplink TCP data packet and TCP ACK packet) in sequence, and the peer layer on the network side must also In-sequence delivery, so if the data link layer has packets that have been preprocessed by the packet data convergence sublayer (PDCP) and are waiting to be sent, subsequent TCP ACK packets sent to the packet data convergence sublayer (PDCP) cannot take precedence over these packets to send

[0008] However, there are two problems with the sending of preprocessed packets: (1) The scheduling time of getting the air interface scheduling resource UL GRANT is uncertain. If L2 (Layer 2, the second layer of the protocol stack) preprocesses the data too early, it will be late At the preprocessing time point, but earlier than the air interface scheduling resource UL GRANT time point, the new TCP ACK packet cannot be sent on the ULGRANT prior to the preprocessed packet, but will wait until the next time the air interface scheduling resource UL GRANT is obtained. Only possible when GRANT

(2) The size of the air interface scheduling resource UL GRANT allocated by the network is uncertain and may not match the accumulated total length of the preprocessed packets. If the accumulated total length of the preprocessed packets is too large, the air interface scheduling resource UL GRANT will If it is not completed, the new TCPACK packet will not be able to send the remaining preprocessed packets prior to the UL GRANT when the next time the air interface scheduling resource UL GRANT is obtained, and may need to be delayed until the next time the air interface scheduling resource UL GRANT is obtained and if the total length of the preprocessed packet is too small, some resources will be wasted in this UL GRANT

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