A Load-Aware Cache-Limited Intermittent Connectivity Satellite Network Routing Method

Abstract

The invention discloses a satellite network routing method with a load sensing buffer memory limitation and interrupted connection, and mainly at solves the problems that a minimal-time-delay route cannot be found accurately in the satellite network with buffer memory limitation and interrupted connection in the prior art due to loss of available buffer memory size information of loads and nodes of a queuing service of a contact link. The method is realized by the steps that 1) a node route list of the whole network is initialized, and a contact plan is synchronized in the whole network; 2) route calculation is started when a node receives a Bundle packet; 3) a link cost is calculated according to the contact plan; 4) a node of minimal link cost is marked till a target node is obtained; and 5) the Bundle packet is forwarded according to the minimal link cost, and the route list of a present node is updated, and routing information of the whole network is synchronized. According to the invention, the minimal-time-delay route of the satellite network with buffer memory limitation and interrupted connection can be calculated accurately, the data delivery rate is improved, and end-to-end time delay of data is reduced; and the routing method can be applied to the satellite network in which the load senses buffer memory limitation and interrupted connection.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a routing method, which can be used in a satellite network with limited intermittent connection of load-aware cache. Background technique [0002] The satellite network has inherent advantages such as wide coverage and not being restricted by geographical conditions, and plays an irreplaceable role in many fields such as communication, national defense, navigation, measurement and control, and rescue. The satellite network is different from the terrestrial network. The challenges it faces mainly include: 1) The long distance between nodes leads to large and time-varying propagation delays, and severe path loss leads to high bit error rates. At the same time, the periodic movement of nodes makes the network topology time-varying. Satellite shading and limited node power lead to frequent link interruptions; 2) Satellite communication is transmitted through line-of...

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Problems solved by technology

[0007] The purpose of the present invention is to propose a satellite network routing method with load-aware cache-restricted intermittent connectivity, to solve the lack of queuing service load and node available cache size information due to contact links in a satellite network with cache-limited intermittent connectivity. As a result, it is impossible to accurately find the minimum delay route, improve the delivery rate of data, and reduce the end-to-end delay of data

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