Virtual network mapping method for high-dynamic satellite network

Abstract

The invention discloses a virtual network mapping method for a high-dynamic satellite network. The virtual network mapping method comprises the following steps: establishing a satellite bottom layer network architecture model; acquiring network topology information through a ground controller and a controller borne on a satellite, and maintaining a virtual network statistical topology and an abstract statistical topology for recording a bottom layer network resource state; when a virtual network request arrives, if the controller accepts the virtual network request, allocating bottom layer resources to the virtual network according to the used mapping algorithm, and updating the abstract statistical topology and the virtual network statistical topology; and when one virtual network serviceis completed, releasing the allocated resources from a bottom layer node. According to the algorithm, a ground station and a high-orbit satellite bear main network control functions, process virtualnetwork requests in a unified manner and map the virtual network requests to a physical network, actively sense link state changes and transmit the link state changes to a controller when a network fault occurs, and the controller extracts virtual network requests on a disconnected link and performs remapping.

Description

technical field [0001] The invention relates to the technical field of aerospace communication, in particular to a virtual network mapping method for high dynamic satellite network. Background technique [0002] With the rapid development of the aerospace field, the cost of launching satellites has become lower and lower. At the same time, because the satellite mobile communication system has the characteristics of wide coverage area, little impact from terrain and landform, and no impact from natural disasters, it is very suitable for applications such as border defense, overseas communication, and emergency communication in major disasters. Therefore, each country began to deploy its own satellite network system, the number of satellites began to increase sharply, and the satellite system began to carry complex and changeable communication services, such as space communication, data relay, meteorological observation, deep space communication, relay transmission etc., the ...

AI Technical Summary

Problems solved by technology

[0011](1) Unable to adapt to the actual scene of the satellite network

[0012]The above resource arbitration mechanism is only optimized for the three conflict scenarios that may arise in the virtual network mapping, namely, the underlying resources of the global dispatch center change during the mapping process However, mapping conflicts, mapping conflicts caused by resources other than CPU and bandwidth not considered, and conflicts caused by changes in network request resource requirements are actually only for general network scenarios, and satellites are not considered. Several important characteristics of the network, so when it is actually deployed on the satellite network, many problems will arise

[0013](2) Unable to adapt to the high dynamics of satellites

The virtual resource scheduling mechanism does not consider the remapping of the request when the underlying link topology changes, which will cause the mapping of the virtual network request to fail

[0015](3) The amount of computation on the star is large

However, communication satellites are mainly used for forwarding, and the resources on the satellite are very limited. If a large amount of resources are used for computing and sensing network conditions, then the entire satellite network will be congested

[0017](4) High resource consumption and low reliability

The entire satellite network has many sub-domain dispatch centers, and the cost is very high

In addition, since the satellite network covers the whole world, but the coverage of ground stations is limited, it is necessary to deploy multiple ground stations around the world to achieve true global control

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