Control method, device and computer system for data transmission

Abstract

The invention relates to the field of communication and discloses a control method, a control device and a computer system for data transmission. The control method comprises the following steps of: detecting the current jam parameter of each connection; determining the size of a sending window of each connection; judging that the connection is in a non-jam state at present if the jam parameter of any connection is smaller than a top jam parameter limit of the current connection, sending data of the connection according to the size of the sending window of the connection in a current control period, and returning to the step of detecting the current jam parameter of each connection; and judging that the connection is in a jam state at present if the jam parameter of any connection is equal to or greater than the top jam parameter limit of the current connection, respectively sending data of the connection according to the size of the sending window of the connection in the current control period, and returning to the step of detecting the current jam parameter of each connection. With the adoption of the technical scheme, the stability of data transmission is improved and the bandwidth utilization is increased.

Description

technical field [0001] The invention relates to the communication field, in particular to a data transmission control method and device and a computer system. Background technique [0002] With the development of communication technology, data transmission is an important component of the current communication network. In the network, data transmission is completed through the network sending device, and in the network topology, a network sending device is often connected to multiple peers. A network The sending device performs a data sending service for multiple connections. [0003] figure 1 For a common structural diagram of a data transmission system that implements multiple connections on a bandwidth-limited network link, see figure 1 As shown, the network sending device (also called the root host 101) is connected to the opposite end (also called the leaf host 102), and the root host 101 and each leaf host 102 share the trunk link 103 (the trunk link 103 is relativel...

AI Technical Summary

Problems solved by technology

[0007] First: According to the ACK message fed back by the receiving end, the prior art network sending device estimates whether the data of this connection is lost and whether the delay exceeds the predetermined range through the determination signal in the ACK message. However, the network transmission itself has a delay, which is likely The data that has not received the ACK feedback signal is currently in the network transmission and will effectively arrive at the receiving end after a certain period of time; when the sending end does not receive the ACK feedback message of the data within the predetermined time, it will determine that the data is lost Congestion control is activated due to packet loss, which leads to a significant drop in network transmission speed due to misjudgment of the occurrence of packet loss in the network, which is not conducive to data transmission and effective use of bandwidth.

[0008] Second: In particular, in the long-fat pipeline network with a large network transmission delay, due to the large delay in network transmission, the sending end is likely to keep most of the data still in transmission according to the ACK message fed back by the receiving end. The data in the process is misjudged as unsuccessfully sent data, resulting in a high misjudgment of packet loss rate, and the above-mentioned transmission speed control will cause data transmission in the network to exist due to sporadic packet loss or misjudgment of packet loss rate. Large shock, which affects the sending of data

[0009] Third: The congestion control in the prior art is to control the transmission of the next control cycle according to the ACK feedback confirmation information of the receiving end, and its control has a large hysteresis

Moreover, in the network, there may be new users joining at any time, and the control method of the above-mentioned scheme 1 is not suitable for a network that changes at any time, and its applicable flexibility is poor

[0010] In fact, a certain user in the network currently has no data transmission service, and the existing technical solutions cannot dynamically use the current idle bandwidth for the user to improve the data service transmission efficiency of each current connection according to the current network status changes

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