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Double-layer Satellite Load Balancing Method Based on Link Cost Transformation

A link cost and load balancing technology, applied in the field of transforming application prospects, can solve problems such as data service congestion, limited processing capacity, and small coverage, and achieve queuing delay and packet loss rate improvement, easy implementation, and simple mechanism Effect

Active Publication Date: 2017-02-22
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0003] In the system architecture with LEO (low-orbit satellite) as the backbone network transmission and MEO (medium-orbit satellite) offloading, due to the limited on-board processing capacity and small coverage of low-orbit satellites, data services are in some local links. Congestion occurs; in addition, medium-orbit satellites have larger coverage than low-orbit satellites, but the propagation delay is larger

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  • Double-layer Satellite Load Balancing Method Based on Link Cost Transformation
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  • Double-layer Satellite Load Balancing Method Based on Link Cost Transformation

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Embodiment Construction

[0034] 1. Congestion estimation

[0035] In order to enable the entire network to better adapt to traffic changes, we plan the traffic distribution of the entire network. According to the regional population distribution estimation, combined with satellite distribution rules, this paper divides the world into 12*6 regions, each cell occupies 30° longitude and 30° latitude, so that the satellites in the constellation can be evenly divided. are distributed in these districts. Each LEO satellite is assigned a traffic estimate w i , when the satellite enters a different cell, the traffic estimate will be updated immediately. According to the basic law of satellite network user distribution and traffic demand, the estimated traffic value of each cell is divided into estimated grades from 0 to 8, such as figure 1 shown. The estimated traffic value indicates the general traffic trend of an area, and it reflects the approximate traffic situation of the current links of the satell...

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Abstract

The invention is a satellite load balancing method based on link cost conversion. The method is based on the satellite virtual topology strategy, and carries out LEO (low orbit) layer link cost conversion and layered distribution on the topology snapshot. Therefore, using the predictability and periodicity of satellite constellation operation, the system running time is divided into several equal time periods, and each time period is divided into n gaps tp, and the inter-satellite link Perform link overload judgment. Carry out congestion level division for the global coverage area, cooperate with LEO satellite link real-time traffic, carry out cost adjustment and path optimization when the link is congested, and balance the traffic of the entire network. And on this basis, cooperate with the MEO layer satellite network to select reasonable paths for transmission services with different quality of service (QoS), and improve the throughput of the entire network while meeting the delay of high-priority services.

Description

technical field [0001] The present invention relates to a satellite load balancing method applied to a double-layer satellite system. The present invention is based on a LEO / MEO double-layer satellite network, and uses the idea of ​​link cost conversion to realize satellite data service distribution, and to adjust the cost when the link is congested And path optimization, improve the balance of the entire network, while reducing the transmission delay and loss probability of data packets in the satellite network. It has good prospects for transformation and application in the fields of aviation, aerospace, military-level satellite architecture, and social economy, and belongs to the field of satellite communication technology. Background technique [0002] With the recent development of satellite return channel and on-board processing technology, satellites are now able to provide two-way communication services with ground stations, and can provide coverage of a wide geograp...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/803H04W28/08H04B7/185
Inventor 孙力娟郭俞江王汝传周剑肖甫叶晓国郭剑
Owner NANJING UNIV OF POSTS & TELECOMM