A formation satellite routing method based on sdn architecture and using sr routing protocol

Abstract

The invention discloses a formation satellite routing method based on the SDN architecture, which belongs to the field of satellite communication; the invention designs a set of space network routing technology solutions based on the SDN architecture and adopts the SR routing protocol, the space network adopts the SDN architecture, and the main management of the network The function is placed in the operation and management center on the ground. At the same time, it completes the interaction with users or services, saves the network topology and completes the routing function. The control function is placed in the ground gateway station, which strengthens the control plane function and combines the idea of ​​distributed controller. The satellite performs the switch function. On the ground or space access side of the user, the source routing information is written. Subsequent nodes, whether on the star or on the ground, complete the forwarding by reading the source routing information in the data packet header, and there is no need to maintain each data flow. forwarding information. In this way, most of the routing control of the space network can be completed on the ground without being bound by on-board computing resources, so that the limited on-board resources can be used for broadband data transmission and reduce processing consumption.

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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