A pim-dm multicast label routing method based on centralized control in space-based network

Abstract

The invention discloses a space-based network PIM-DM multicast label routing method based on centralized control, which supports the user network to adopt the standard PIM-DM multicast routing protocol and the standard multicast group protocol to interact with the space-based network to realize the user IP group Routing and forwarding of broadcast services in the space-based network. The method is jointly completed by a centralized controller, a space-based backbone satellite, and a multicast function on a satellite terminal. The satellite terminal completes the conversion of standard PIM‑DM multicast routing protocol signaling, standard multicast group protocol and satellite side PIM‑DM multicast label routing signaling, and label encapsulation and decapsulation of IP multicast data; space-based backbone satellites Complete the inter-satellite forwarding of IP data with multicast labels; the centralized controller and satellite terminals complete the interaction of satellite-side PIM-DM multicast label routing signaling, calculate the multicast forwarding path, and send it to satellite terminals and space-based backbone satellites . This solution can reduce the processing pressure and storage overhead of spaceborne equipment, and is suitable for space-based networks with limited on-board 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-DM multicast label routing method based on centralized control in a space-based network. Background technique [0002] The space-ground integrated network is an information network composed of satellites with different orbits, types and characteristics, constellations and corresponding ground infrastructure. They are connected together through inter-satellite and satellite-ground links. According to the different functions of satellite nodes, they can be divided into It is space-based network, space-based access network and ground node network. The space-based network mainly adopts layered deployment of multi-functional satellites or ground gateway stations distributed on different orbital planes such as GEO, IGSO or HEO to achieve global seamless coverage. Provides functions such as traffic sharing, communication guarantee in hostile ...

AI Technical Summary

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 backbone satellite nodes. Since most of the backbone nodes are high-orbit satellites, multiple beams are installed on the satellite, and each beam covers The area 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 standard multicast routing protocol PIM-DM has poor scalability in space-based networks. The standard multicast routing protocol PIM-DM belongs to service-driven multicast forwarding. When the multicast stream arrives, the multicast stream information needs to be reported to the CPU, and the CPU generates a multicast routing table in real time. At the same time, the PIM-DM protocol depends on the unicast routing protocol, and needs to refresh the status periodically and maintain the status of the multicast stream periodically. The above processing All of them cause a huge processing burden on the space-borne nodes, and the capacity of the space-borne nodes is very limited, so it cannot support large-scale terminal networking under the existing conditions

[0007] Third, the standard multicast routing protocol PIM-DM is designed for fixed ground networks and cannot adapt to the characteristics of satellite terminals such as cross-satellite and cross-beam switching. The standard multicast routing protocol PIM-DM 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-DM in space-based networks

[0008] Finally, the standard multicast routing protocol PIM-DM 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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