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Quick retransmission technique based on packet switching network

A packet switching network and fast retransmission technology, applied in the field of network communication, can solve the problems of long delay, occupying bandwidth, and reducing communication quality, etc., and achieve the effect of fast data transmission speed, fast initiation of retransmission, and bandwidth saving

Active Publication Date: 2009-11-25
ZHEJIANG NEW ZAILING TECH CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

This will lead to too long delay and reduce the communication quality, or even fail to meet the communication requirements
At the same time, it causes a waste of bandwidth in the overall communication system
[0008]The current algorithm uses independent ACK packets, which will occupy bandwidth; and it is judged by the sender. When the sender retransmits data, it receives 3 ACK and judge before sending, resulting in too long delay

Method used

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  • Quick retransmission technique based on packet switching network
  • Quick retransmission technique based on packet switching network
  • Quick retransmission technique based on packet switching network

Examples

Experimental program
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Embodiment Construction

[0024] The present invention adopts the digital logic circuit in the Field Programmable Gate Array (hereinafter referred to as FPGA) to realize fast retransmission in the packet network to ensure the integrity of the data and ensure the reliable transmission of the data in the unreliable packet switching network.

[0025] See figure 1 , the data packet with sequence number 2 in the data packet sent from device A to device B is lost; when device B sends the data packet with sequence number 3, it sends a resend request; after receiving the resend request, device A The data packet with the number 2 is resent; the data packets received by device B are continuous at this time, thus ensuring the reliable transmission of data;

[0026] Work process of the present invention:

[0027] ● see figure 1 , when the data packet is sent, each data packet is affixed with a serial number (SN, SerialNumber), and the serial numbers of the data packets sent to the same user are guaranteed to be ...

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Abstract

This invention belongs to the technical field of network communication, in particular to a quick retransmission technique based on packet switching network, mainly comprising steps as follows: 1) sticking a serial number on each data packet during data packet transmission, and ensuring that serial numbers of data packets transmitted to the same user are continuous; 2) requiring for continuous serial numbers and field for confirming reception serial numbers while transmitting data packets; 3) checking continuous serial numbers in the transmitted data packets and checking continuity of serial numbers on reception side, thereby judging whether there is lost data packet, if so, transmitting a data packet retransmission request using the field for confirming reception serial numbers; 3) adopting original serial number and mark of retransmitted data by the retransmitted data packet. Accordingly, this invention saves bandwidth and achieves high data transmission speed, through which it quickly initiates retransmission to lost data packets in unreliable packet switching network, thereby achieving reliable transmission of data packets.

Description

technical field [0001] The invention belongs to the technical field of network communication, in particular to a fast retransmission technology based on packet switching network. Background technique [0002] A packet-switched network is a network that provides connectivity between any location. Network packets from many users are sent to a packet-switched network where they can be delivered to any remote location connected to the network. [0003] Data integrity cannot be well maintained in packet-switched networks due to packet loss during network transmission. The currently researched fast retransmission algorithm is: when receiving an out-of-sequence message segment, TCP needs to generate an ACK (a repeated ACK) immediately. This duplicate ACK should not be delayed. The purpose of the repeated ACK is to let the other party know that an out-of-sequence message segment has been received, and tell the other party the sequence number it wishes to receive. In this retrans...

Claims

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Application Information

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IPC IPC(8): H04L1/16
Inventor 朱仁昌
Owner ZHEJIANG NEW ZAILING TECH CO LTD
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