Method for transmitting data by sliding-window backward mode

Abstract

The invention is concerned with the data transmission method using sliding window backing mode, includes: sending side resends the send data after waiting for the response overtime, sends the data that is from received response frame corresponding with the next frame of the data frame. The invention can not resend the data that the receiving side has send, reduce the inefficacy resend, and improve the transmission efficiency; the invention also can not resend the data immediately, when data frame correspond with the response frame before receiving the last data frame sending from the current windows, but wait for the data response frame of the opposite side continuously, in order to reduce depend on the response frame, improve the transmission efficiency.

Description

A data transmission method adopting sliding window backward mode technical field The invention relates to the technical field of data transmission, in particular to a data transmission method adopting a sliding window retreat method. Background technique During the operation of the base station, due to the randomness of user access, the message flow of communication between base station boards has a probability distribution. When the base station performs software upgrades, the message flow of inter-board communication is increased. The file downloaded by the single-board software is usually relatively large, requiring a large amount of data to be transmitted, and the transmission time is relatively long. The file download may fail due to the loss of inter-board messages. Therefore, when performing a software upgrade, the download of the board software needs to use a more reliable data transmission mechanism to ensure the successful transfer of files between boards. In ...

AI Technical Summary

Problems solved by technology

1. When the sender waits for the response frame to time out and resends the sent data, it will retransmit from the first frame of the current window, resulting in low transmission efficiency

For example, after the sender completes the data of the first to tenth frames and has received the response frame corresponding to the sixth frame, if the response frame is not received subsequently, wait for the response frame timer to expire and resend from the first frame ;In fact, since the response of the sixth frame has been received, there is no need to start sending from the first frame. Therefore, due to the large retreat of the sliding window, the number of retransmitted data frames increases, which reduces the transmission efficiency.

2. The sender relies too much on the response frame returned by the receiver. If the number of frames in the response interval of the receiver is too small, it will cause a large number of response frames and increase the message flow. Therefore, the fault tolerance mechanism of this method is poor.

3. The window size adjustment algorithm is relatively fixed. When reducing the sending window, the window size is simply halved, and the window size is not adjusted according to the actual receiving situation of the other party. The size will still cause a large number of data frame retransmissions, which reduces the transmission efficiency and wastes resources

4. The receiver simply ends the file transfer after the timeout, and there is no mechanism to actively request the sender to retransmit

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