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Transmission agreement special for TP-S satellite channel

A satellite channel and transmission protocol technology, applied in transmission systems, radio relay systems, active electrical relay systems, etc., can solve the problem of high burst error rate, high burst error rate, and insufficient channel capacity of satellite channels. use, etc.

Inactive Publication Date: 2003-03-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the 64KB sending window cannot make full use of the satellite channel bandwidth
[0007] 3) High burst error rate: The burst error rate of the satellite channel is high. Due to the use of wireless channels, the satellite communication system is easily affected by natural factors such as weather, and burst errors occur
Therefore, the time required for the congestion control mechanism to recover the transmission rate from an error on the satellite channel is much longer than that of the terrestrial channel, and the channel capacity has not been fully utilized during such a long period of time.

Method used

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  • Transmission agreement special for TP-S satellite channel
  • Transmission agreement special for TP-S satellite channel
  • Transmission agreement special for TP-S satellite channel

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Experimental program
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Embodiment Construction

[0067] The invention is in figure 2 Used in the external interactive satellite communication system shown, the basic data transmission process is as follows image 3 As shown, it is described as follows:

[0068] image 3 It is a schematic diagram of the basic transmission process of the protocol. For simplicity, the data in this diagram is transmitted in one direction. This figure mainly wants to illustrate the error retransmission process in the transmission, so it does not include the connection establishment and termination part. The sender sends data frames continuously, and the sequence number of the data frame increases one by one from 0. After the fourth FD data frame is sent, a POLL data frame is sent. The reason for the sending may be that the POLL timer expires or the number of sent data frames exceeds the preset threshold. This POLL frame tells the receiving end that the next FD sequence number to be sent is 5, so the receiving end should receive FD numbers 0...

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Abstract

The character of the invention are as follows. The response mechanism of the TCP protocol is changed to the choice passive response. The sending ned only retransmits the data frames that the receiving end requests for re-transmitting definitely. The following measures change the conservative congestion control mechanism of TCP protocol to the active congestion control mechanism. The size of the slide window is set up as 32bit. When the congestion being detected, the decrement of the congestion window is 2 / 3 in TCP. In the congestion elusion stage, the congestion window takes on the non-linear growth. The rearward facing explicit congestion indicator is adopted so that the router informs the data-sending end directly that the network is about to be congested.

Description

Technical field: [0001] The TP-S satellite channel dedicated transmission protocol and transmission method belong to the satellite channel transmission protocol and technical field. Background technique: [0002] Because the satellite channel has some characteristics different from the terrestrial channel, and the TCP / IP protocol was originally designed for the terrestrial network, the transmission performance of the TCP / IP protocol on the satellite channel is relatively poor. Several factors that have a greater impact on TCP are: [0003] 1) Long delay: The delay of the satellite channel is very long. In the GEO system, the transmission round-trip time (the time required for the sender to send data to receive the response) is 540 milliseconds, while the transmission round-trip time of the general ground network is several to tens of milliseconds. Such a large delay makes TCP's slow start take a long time. Mechanisms such as congestion control also take several round trip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/59H04B7/15H04L29/06
Inventor 龙飞曹志刚
Owner TSINGHUA UNIV
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