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Double-deck satellite load balancing method based on link cost conversion

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

Active Publication Date: 2014-10-01
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-deck satellite load balancing method based on link cost conversion
  • Double-deck satellite load balancing method based on link cost conversion
  • Double-deck satellite load balancing method based on link cost conversion

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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 Show. 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 satelli...

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Abstract

The invention provides a double-deck satellite load balancing method based on link cost conversion. According to the method, on the basis of the virtual topology strategy of a satellite, low earth orbit (LEO) layer link cost conversion and layered flow division are conducted on a topology snapshoot. Thus, by means of predictability and periodicity of constellation running of the satellite, system running time is divided into a plurality of same time periods, each time period is divided into n gaps tp, and link overload judgment is conducted on an inter-satellite link in each time gap. Congestion grading is conducted on a global coverage area, cost regulation and route optimization are conducted in cooperation with the real-time flow of the LEO satellite link when the link is congested, and therefore flow of the whole network is balanced. On this basis, reasonable route selection is conducted on transmission service with different qualities of service (QoS) in cooperation with the MEO layer satellite network, and the throughput of the whole network is improved while the requirement for the high priority service time delay is met.

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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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
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