Formation satellite routing method based on SDN architecture and adopting SR routing protocol

Abstract

The invention discloses a formation satellite routing method based on SDN architecture, and belongs to the field of satellite communication. According to the invention, a spatial network routing technical scheme based on an SDN architecture and adopting an SR routing protocol is designed, the spatial network adopts the SDN architecture, the main management function of the network is placed in a transport management center on the ground, interaction with users or services is completed at the same time, network topology is saved, and the routing function is completed. The control function is realized in a ground gateway station, the control plane function is enhanced, and the idea of a distributed controller is combined. A satellite then performs the function of a switch. On a user ground orspace access side, writing-in work of source routing information is completed, and a subsequent node completes forwarding by reading the source routing information in a data packet header no matter on a satellite or on the ground, and does not need to maintain forwarding information of each data stream. In this way, most of routing management and control of the space network can be completed on the ground and is not limited by satellite computing resources, so limited satellite resources are used for broadband data transmission, and processing consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of formation satellite network protocols, in particular to a routing method that can be used for formation satellite routing to meet data service transmission of high and low orbit satellite nodes. Background technique [0002] Tiandi network routing is mainly to solve the problem of data transmission between various system segments and between users or nodes within each system segment. Based on complex network topology, among multiple reachable paths between any source node and destination node, Select a reasonable optimal path according to certain rules to ensure that the network delay, throughput, link utilization and other indicators meet the requirements. [0003] Different from the terrestrial network, the space segment network of the space-ground network consists of satellite nodes and inter-satellite links, considering the limited on-board processing and storage capacity, continuous and highly dynami...

AI Technical Summary

Problems solved by technology

[0005] However, due to the high altitude of the satellite orbit and the long transmission path with the ground terminal, satellite communication has the disadvantages of large delay and high bit error rate

In addition, the transmission path of the satellite network is complex, and the relative position of the satellite and the terminal as well as the atmosphere will affect the transmission

Inter-satellite switching is an unavoidable problem in low-orbit satellite networks: the continuous movement of satellites causes users who are occupying resources to leave the current satellite and access the next satellite

[0025] On-star node data plane development is limited by a variety of special processes and environments. The number of label stacks that can be supported may not be as scalable as ground routers. It is easy to cause label stacks that cannot accommodate all routes completely relying on source routing technology. information dilemma

[0026] Due to the frequent changes in the space network topology, it is impossible to use SR technology to directly multiplex one or more paths containing multiple hops at the IP layer like in the ground network, but pressing each node label into the packet header will face the aforementioned first and The second problem, and will cause a large packet header overhead in the space network where bandwidth is precious

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