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Delay determinacy message retransmission method with local cache

A local caching and deterministic technology, applied in the transmission system, radio transmission system, error prevention/detection using the return channel, etc., can solve the problems of low message retransmission efficiency, waste of channel resources, etc. Transmission efficiency, improvement of satellite channel utilization, and the effect of reducing frequency and quantity

Active Publication Date: 2014-05-28
PLA UNIV OF SCI & TECH
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Problems solved by technology

[0005] The present invention provides a delayed and deterministic message retransmission method with local buffering, which solves the problems of low message retransmission efficiency and serious waste of channel resources caused by the long delay of the satellite link

Method used

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  • Delay determinacy message retransmission method with local cache
  • Delay determinacy message retransmission method with local cache
  • Delay determinacy message retransmission method with local cache

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Embodiment

[0044] Embodiment A delayed deterministic message retransmission method with local cache, by recording the specific packet loss of message transmission, when packet loss occurs, the receiving end sends a deterministic retransmission request to the sending end, requesting transmission of lost message, the request carries information about one or more lost messages; a retransmission delay is set for a newly lost message, and when a new message is lost, the receiving end sends a request to the sending end to transmit a new message after the retransmission delay Lost message: A local buffer is set at the gateway of the receiving end of the satellite link. When the reverse link ACK transmission sent by the receiving node is lost, the gateway of the receiving end resends the message.

[0045]The deterministic retransmission request option is activated through the TCP connection establishment process, the deterministic retransmission request option is located in the option field of th...

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Abstract

The invention provides a delay determinacy message retransmission method with a local cache. A receiving end requests data which needs retransmitted from a sending end unequivocally, and information of more than one lost data section is included in a request. The local cache is arranged, lost messages can be subjected to local retransmission, and accordingly the phenomenon of packet loss of a reverse link ACK can be avoided. The method is a strategy through which loss restoring is carried out quickly with limited bandwidth, on a channel with large delay and error rate and asymmetric link bandwidth, the frequency and the amount of message retransmission are reduced, and the problem of channel efficiency lowering during packet loss caused by reverse channel bandwidth limiting on the channel is avoided. By arranging the local cache, the problem that channel transmission efficiency is low due to large delay when reverse ACK messages are lost can be solved. According to the method, satellite link message retransmission efficiency can be greatly improved, and satellite channel using rate is greatly improved.

Description

technical field [0001] The invention relates to a delayed and deterministic message retransmission method with local cache. Background technique [0002] Because satellite links have the characteristics of extended propagation time, large bandwidth and delay product, and high bit error rate, the performance of the widely used TCP protocol in the Internet is greatly affected when it is applied to satellite links, which seriously limits the performance of satellite links. Resource utilization and transmission efficiency cannot meet various business needs. The TCP protocol, Transmission Control Protocol, is a protocol for feedback and response. The receiving end will return the data reception status to the sending end through an ACK message, especially when the message is lost due to link error or network congestion. ACK information understands packet loss and triggers packet retransmission. In the satellite link, the large delay makes the above retransmission efficien...

Claims

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Application Information

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IPC IPC(8): H04L1/18H04B7/185
Inventor 汤凯续欣
Owner PLA UNIV OF SCI & TECH
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