High efficient interactive transmission method applicable to deep space interplanetary satellite network

Abstract

The invention belongs to the technical field of deep space interplanetary satellite network transmission. The deep space interplanetary satellite network transmission is characterized by comprising the following steps of: beginning to send information data in a connection establishing stage; adopting a sending strategy of sending three priorities of packet data at equal intervals in a crossed way; adopting an initialization sending strategy; judging data loss reason according to loss situations of different priorities of packet data; analyzing network congestion degree; adopting a corresponding information traffic control algorithm; and adopting an actively and periodically selected receiving and answering strategy. In a deep space interplanetary satellite network with extremely high random error codes, serious burst error codes, extremely long propagation delay and very asymmetric channel width, by using the method, the connection waiting time consumption can be avoided, the information traffic can be rapidly increased, the link error code and congestion situation can be effectively distinguished, and the corresponding information traffic control can be adopted according to the congestion degree of the network to largely reduce the transmission bandwidth requirement of a reverse link.

Description

technical field [0001] The invention belongs to the technical field of deep space interstellar satellite network transmission. Background technique [0002] At present, the TCP protocol, which is widely used on the Internet, was proposed in the 1980s. In the course of decades of development and evolution, there have been protocol versions such as TCP-Tahoe, TCP-Reno, TCP-NewReno, and TCP-SACK. , the application of TCP-Reno is the most common. These different versions of the TCP protocol are designed for wired networks with extremely low bit error rates and very small propagation delays, that is, the possibility of errors caused by bit errors during data transmission is very small, and the waiting time for data reception and response is very small. short. Therefore, once data is lost or damaged and there is no response for a long time, the TCP protocol will consider that the network is congested and adopt flow control algorithms such as congestion avoidance. These assumpti...

AI Technical Summary

Problems solved by technology

[0009] The extremely high link random bit error rate in the deep space interstellar satellite network seriously affects the transmission performance of the TCP protocol, which makes the protocol repeatedly start the slow start algorithm while continuously retransmitting the lost information, which severely limits the high speed of the TCP connection information flow. transmission, sometimes resulting in the inability to transmit information

[0010] 3) Serious channel burst error

[0012] Severe channel burst errors in the deep space interstellar satellite network make the performance of the TCP protocol more unstable, and sometimes even lead to timeout retransmissions, making the performance of TCP the worst

[0013] 4) Serious channel bandwidth asymmetry

[0015] The severe link bandwidth asymmetry in the deep space interstellar satellite network makes the TCP protocol often cause a sharp drop in the throughput of the forward link due to the information congestion of the reverse transmission link during the information transmission process.

[0016] 5) Periodic link interruption

Therefore, the performance of these TCP improvement schemes in the deep space interstellar network is very poor. Now we will analyze the impact of the network characteristics of the deep space interstellar network on the performance of the improved scheme

[0053] 1. The extremely long propagation delay makes typical protocols in various improved schemes such as Fast Start, STP, TCP-Peach, TCP Westwood, TCP-STAR, XCP, and TP-Satellite spend a very long time waiting for the connection to be established Confirmation, but also makes the congestion window grow very slowly, limiting the flow of information;

[0054] 2. The extremely high random bit error rate of the channel causes Fast Start, STP, TCP Westwood, TCP-STAR and other improved protocols to mistakenly believe that the network congestion is serious, which makes the protocol continuously start the slow start algorithm, and the forward throughput of the protocol is greatly affected limit;

[0055] 3. Serious channel burst errors make Fast Start, STP, TCP Westwood, XCP and TCP-STAR protocols unable to transmit data normally, and also make TCP-Peach protocol detect the network link status by sending a large number of invalid data segments It loses its function, and also reduces the accuracy of link state judgment by the TP-Satellite protocol that uses high and low priority to alternately send data;

[0056] 4. Serious channel bandwidth asymmetry makes the reverse link data transmission seriously congested, resulting in extremely low throughput of the forward link of many improved solutions, or even unable to transmit data;

[0057] In addition to the above-mentioned problems, the currently proposed improvement plan cannot make a judgment on the congestion status of the deep space interstellar network, that is, it cannot make corresponding data flow control according to different degrees of network congestion.

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