Space delay tolerant network congestion control method based on QoS

Abstract

The invention discloses a space delay tolerant network congestion control method based on QoS. The method comprises the following steps: S1, adding contact congestion level information with a remaining node storage space and a contact remaining available capacity as judgment reference in a contact information format; S2, judging the contact congestion level according to the contact remaining available capacity and the remaining node storage space, and sending a congestion information notification to other nodes; S3, updating the contact congestion level in a contact plan by a node receiving the congestion information notification, calculating an optimal path congestion level by a node requiring a forwarding beam, and forwarding the beams of all priorities in the case of no congestion; forwarding the beams with high priorities and middle priorities in the case of slight congestion; forwarding the beams with high priorities in the case of serious congestion; and in the case of complete congestion, if the judgment reference is the contact remaining available capacity, forwarding the beams with high priorities, and if the judgment reference is the remaining node storage space, forwarding the beams via a secondary optimal path. By adopting the space delay tolerant network congestion control method disclosed by the invention, in the case of network congestion, the data transmission rate is improved, and the transmission delay is shortened.

Description

technical field [0001] The invention relates to the technical field of computer network. More specifically, it relates to a QoS-based spatial delay-tolerant network congestion control method. Background technique [0002] With the rapid development of aerospace, satellite communication and other technologies and the continuous advancement of national information construction, space information networks play an irreplaceable role in many fields such as communication, national defense, navigation, measurement and control, and rescue. The delay tolerant network (Delay Tolerant Network, DTN) proposed by NASA can cope with the characteristics of long end-to-end delay, high bit error rate and frequent link interruption in the space environment, and meet the requirements of establishing an interconnected network in a complex space environment. The DTN architecture adds a bundle layer protocol (BundleProtocol, BP) and a convergence layer protocol (ConvergenceLayerAdapter, CLA) unde...

AI Technical Summary

Problems solved by technology

[0008] When calculating the route, CGR will only consider whether the remaining available capacity of the first contact in the path satisfies the sending conditions of the bundle. When the remaining available capacity of the first contact is smaller than the bundle size, it will choose another path to send, but it does not take the path into consideration. The remaining capacity of other contacts in the middle contact, when the remaining capacity of the middle contact is insufficient, the path calculated at the initial node may be congested in the middle contact, and the optimal path is missed. At this time, the lack of remaining capacity of the contact causes the network congestion situation

[0009] Similarly, when CGR calculates the route, it only considers the remaining capacity of the first contact, and does not consider the remaining storage space of the node. When the remaining storage space of the node is less than the remaining capacity of the contact, the contact obtained by multiplying the remaining contact time by the The capacity can no longer truly reflect the status of the contact capacity. At this time, the real capacity of the contact will become the size of the remaining storage space of the node. If the remaining storage space of the node has been exhausted and there are still bundles arriving, the node will discard the newly received bundle. , at this time, it is the case that the remaining storage space of the node is insufficient and the network is congested

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