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Satellite reliability routing method and system based on link survival duration weighting

A time-to-live, reliable technology, applied in the routing field of low-orbit satellite communication systems, can solve problems such as packet loss, and achieve the effect of reducing the convergence time

Active Publication Date: 2021-08-27
XI AN JIAOTONG UNIV +1
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a satellite reliability routing method and system weighted by link survival time to solve the problem of packet loss caused by disconnection of links between adjacent satellites at high latitudes

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  • Satellite reliability routing method and system based on link survival duration weighting
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  • Satellite reliability routing method and system based on link survival duration weighting

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Embodiment Construction

[0045] combine Figure 1 to Figure 3 , the present invention is further described:

[0046] Step 1: Build a network model. The network architecture of the present invention is as figure 1 As shown, the two-tier satellite architecture is realized based on the idea of ​​software-defined satellite network. The software-defined satellite network mainly includes three types of nodes: controllers, switches, and terminal hosts, forming a top-down three-tier architecture.

[0047] The specific functional design of the three types of nodes includes the following:

[0048] Controller: GEO satellites are used as the controller, and three GEO satellites form a distributed controller, which is responsible for collecting satellite data and link data of each LEO switch node, and generating flow table items according to the pre-configured control management strategy and sending them to the corresponding LEO satellites.

[0049] Switch: LEO satellites are used as switching nodes and conne...

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Abstract

The invention relates to a link survival duration weighted satellite reliability routing method and system, and the method comprises the following steps: satellite network topology division: obtaining satellite network ephemeris data according to low-orbit satellite constellation parameters, and converting a complete operation period of a satellite network into a discrete static network time slice topology; a satellite network time slice topology is simplified into a weighted model graph, bottleneck link time BLT of a path is introduced, and an optimal path considering time delay and packet loss in a balanced manner is generated through a time delay parameter w1 of a link and a survival time parameter w2 of the link; and routing decision forwarding: based on a GEO + LEO double-layer satellite architecture, issuing a routing decision in a multicast form by means of a GEO geostationary satellite. According to the invention, the shortest path with the longest effective survival time can be generated; the path is not easily influenced by disconnection of the inter-satellite link in network topology updating, so that the problem of packet loss caused by switching of the inter-satellite link is solved, and the stability and the reliability of the routing path are improved.

Description

technical field [0001] The invention belongs to the routing field of low-orbit satellite communication systems, and in particular relates to a satellite reliability routing method and system weighted by link survival time. Background technique [0002] Satellite routing technology has always been a key research content in satellite communication networks, especially in low-orbit satellite mobile communication systems. The state of motion causes the link state between satellites to change continuously, including link on-off state, link length state and other information. Satellite routing technology needs to select the optimal path according to the given path cost index among the many reachable paths between the source host and the destination host. Due to the difficulty in path selection and maintenance due to the movement of satellites, it is necessary to design a routing strategy that can ensure the performance and timeliness of the forwarding path in order to improve the...

Claims

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Application Information

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IPC IPC(8): H04B7/185H04L12/721H04L12/727H04L12/733H04L45/121H04L45/122
CPCH04B7/18584H04B7/18521H04B7/18519H04L45/122H04L45/124H04L45/121
Inventor 苏园梦闫长江陈立水唐亚哲焦利彬王斌
Owner XI AN JIAOTONG UNIV
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