Satellite network routing method based on control point optimization of software-defined network

Abstract

This invention relates to the technical field of satellite communication, and specifically relates to the satellite network routing method based on control point optimization of software-defined network. The method comprises the following steps: satellite node sets different path cost functions according to different types of communication services; initialize network and maintain basic routing table; real-time monitor self-service and transmit service load; according to the feedback result of load state of a satellite link, judge whether the link is jammed or not; and if so, start a bypassing mechanism for avoiding the jam till the link in the jam area is less than a jam relief threshold. The method provided by the invention combines the characteristic of centralized control of the software-defined network and the prior satellite routing technology, avoids the jam and balances the load of the network by using a lower overhead, considers the QoS (Quality of Service) requirements of different service types, and preferentially bypasses the service with a lower priority; based on the service flow, the bypassing service is realized; and according to the rate of the bypassing service, reasonable hash function is set to select the bypassing service flow ID (Identification), so that the group with same one service flow is arrived according to the order of the sequence.

Description

technical field [0001] The invention belongs to the technical field of satellite communication, and in particular relates to a satellite network routing method based on software-defined network control point optimization. Background technique [0002] With the development of global communication technology, satellite communication plays an increasingly important role in global communication. The satellite network has the advantages of seamless global coverage and little restriction by the geographical conditions of the earth. The multi-layer satellite network consists of various satellite constellations such as low-orbit satellites (LEO), medium-orbit satellites (MEO) and geosynchronous orbit satellites (GEO). The satellites in the layer are connected by Inter-Satellite Link (ISL). The layers are connected by Inter-Layer Link (IIL). Compared with the traditional single-layer satellite network, the multi-layer satellite network has better flexibility, wider coverage, larger ...

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Problems solved by technology

[0004] However, the above method still faces challenges in practice. Specifically, the MLSR algorithm only uses the upper-layer satellites to calculate the distribution routing table, which requires the upper-layer satellites to have strong computing capabilities, and does not make full use of their ability to transmit services. The current lower-layer network is heavily loaded. When congestion occurs, it cannot be effectively alleviated, and network load balancing cannot be achieved; the second method classifies and classifies services according to the delay requirements of services, but does not fully consider the different requirements of different types of services for other service qualities (such as bandwidth); In the HDRP algorithm, if two adjacent satellite groups are different, routing needs to be forwarded by upper-layer satellites, which will generate greater delay and cause network performance to degrade

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