Space-based network PIM-SSM multicast label routing method based on centralized control

Abstract

The invention discloses a space-based network PIM-SSM multicast label routing method based on centralized control, which supports a user network to adopt a standard PIM-SSM multicast routing protocol and a standard multicast group protocol to interact with a space-based network, and realizes routing forwarding of a user IP multicast service in the space-based network. The system and the method are jointly completed by multicast functions on an integrated controller, space-based network satellite nodes and satellite terminals. The satellite terminal completes conversion of a standard PIM-SSM multicast routing protocol signaling, a standard multicast group protocol and a satellite side PIM-SSM multicast label routing signaling, and label encapsulation and de-encapsulation of IP multicast data; the space-based network satellite node completes inter-satellite forwarding of the IP data with the multicast label; and the integrated controller and the satellite terminal complete interaction of satellite side PIM-SSM multicast label routing signaling, calculate a multicast forwarding path, and issue the multicast forwarding path to the satellite terminal and the space-based network satellite node. According to the scheme, the processing pressure and the storage overhead of the satellite-borne equipment can be reduced, and the method is suitable for the space-based network with limited satellite resources and link bandwidth.

Description

technical field [0001] The invention relates to the technical field of space-ground integrated network communication, in particular to a PIM-SSM multicast label routing system and design method based on centralized control in a space-based network. Background technique [0002] The integrated space-earth network is an information network composed of satellites, constellations and corresponding ground infrastructures with different orbits, types and characteristics. They are connected through inter-satellite and satellite-ground links. According to the different functions of satellite nodes, they can be divided into It is a space-based network, a space-based access network and a ground node network. The space-based network mainly adopts the hierarchical deployment of multi-functional satellites or ground gateway stations distributed on different orbital planes such as GEO, IGSO or HEO to achieve seamless global coverage. It is mainly used for the extension and expansion of th...

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Problems solved by technology

[0005] First of all, multicast has the same port communication problem. In the space-based network, the satellite terminal acts as a multicast router to interact with the satellite nodes of the space-based network. Since most of the satellite nodes of the space-based network are high-orbit satellites, multiple beam beams are installed on the satellite. , the area covered by each beam is very large. When the satellite terminals in the beam perform multicast communication with each other, normal multicast routing protocol convergence cannot be performed. This is caused by the different links between the ground network and the wireless network.

The currently known method is to set a switch when the satellite beam is forwarded on the same port, and when multicast communication in the beam is required, turn on the switch, and a copy of the multicast data will be broadcast under the same beam so that the satellite terminals in the beam can receive it. The method cannot achieve dynamic forwarding according to the actual situation of the receiver, which belongs to the method of static configuration

[0006] Secondly, the scalability of the standard multicast routing protocol PIM-SSM in the space-based network is very poor. Space-borne node capabilities are limited and cannot support large-scale terminal networking

[0007] Third, the standard multicast routing protocol PIM-SSM is designed for fixed ground networks and cannot adapt to the characteristics of satellite terminals such as inter-satellite and cross-beam switching. The standard multicast routing protocol PIM-SSM does not support mobility. After the multicast router moves , reconfigure the address, and wait for the convergence of the unicast routing protocol again, which severely limits the use of the standard multicast routing protocol PIM-SSM in space-based networks

[0008] Finally, the standard multicast routing protocol PIM-SSM adopts a distributed design, which cannot effectively control the multicast sources and multicast receivers entering the space-based network. The routing protocol is easy to be attacked and the multicast traffic is easy to be induced. Base Network Security Deterioration

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