Spatial network transmission control protocol

Abstract

The invention discloses a spatial network transmission control protocol. The spatial network transmission control protocol comprises the following steps: a congestion control algorithm of a TCP Hyblais used, wherein after a congestion window is adjusted each time, a timer is started, a congestion window is added again by taking half of an RTT as an interval, and a high-delay network new congestion control mechanism is achieved; occurrence of congestion is explicitly notified to a sender by configuring a router or a switch, wherein when the sender receives an explicit congestion notification,the sending rate is decreased according to a preset provision, and ECN-based congestion determination is achieved; and a connection keep-alive minimum time parameter is provided by an application process, wherein the application process configures the shortest survival time of long connection of the spatial network transmission control protocol by setting the parameter. The method is more suitablefor a spatial network environment on the aspects of congestion control and reliable transmission, effectively improves the applicability, the stability and the reliability of transmission control andis simple and easy to achieve.

Description

technical field [0001] The invention relates to the technical field of the Internet, in particular to a space network transmission control protocol. Background technique [0002] The characteristics of the communication channel in the space network are different from those of the ground network. The space network will pose severe challenges to the reliable transmission protocol of TCP (Transmission Control Protocol) used by the ground network: [0003] (1) High link bit error rate: TCP uses packet loss as a signal of congestion, and when packet loss occurs, the speed will decrease. But the cause of packet loss in the space network also includes the wrong transmission of the link. For satellite links, the bit error probability is approximately 10-7. In case of rain fading, the bit error rate will increase greatly, and the packet loss due to bit errors can even exceed 50%. In extreme cases, the channel cannot communicate normally. In this case, frequent packet loss will mak...

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Problems solved by technology

In case of rain attenuation, the bit error rate will increase greatly, and the packet loss due to bit errors can even exceed 50%. In extreme cases, the channel cannot communicate normally.

In this case, frequent packet loss will make TCP unable to maintain a high sending window, and will perform a large number of retransmissions

The final transfer throughput will drop significantly

[0004] (2) Large propagation delay: Affected by the distance between communication devices, the delay between space network end systems will be much larger than that of the ground network

In particular, the slow start of TCP will be greatly affected by high latency, and the sender needs a longer time to converge to a stable state; high latency also makes the information on the path, such as: packet loss, delay changes, etc. Slow, indirectly affects performance

[0005] (3) Link bandwidth asymmetry: limited by the size of the transmitting antenna of satellites and other spacecraft equipment, the link will appear asymmetrical

In extreme cases, the uplink and downlink bandwidth ratio of the satellite channel can reach 1:1000, which may cause congestion caused by ACK when using TCP

[0006] (4) The link is easily interrupted: because the carrier of the space network may move during communication, the space link may not be stable

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