面向空地网络的逻辑扁平化路由设计

发布时间：2018-10-25 19:17

【摘要】：为实现地面通信网络对高山、海洋的全域覆盖,应对地震、飓风等自然灾害对地面通信网络造成的损坏,有必要研究和构建空天地一体化网络。空天地一体化网络中的临近空间网络,处于卫星网络与地面网络中间的位置,在空天地一体化网络中起着重要的承上启下的作用。本文以空天地一体化网络作为整体研究背景,主要研究由临近空间网络与地面网络构成的双层空地网络,同时将卫星网络作为空地网络的重要补充,重点研究空地网络的路由问题。本文首先介绍了空地网络系统,其中包括网络架构和各个子网的特点等。为在这样的系统下进行路由,本文对现有路由进行了概述,综合空地网络的特点,说明了空地网络中需要采用动态的半集中半分布的一体化路由设计方法。然后根据空地网络路由研究现状,结合空地网络对路由的要求,设计得到逻辑扁平化路由机制。该机制将空地双层网络拓扑进行扁平化,形成包含整个空地网络拓扑信息的单层网络拓扑。利用此拓扑进行路由计算可以得到最优路由。为实现逻辑扁平化路由机制,需要将不同性质的链路通过相同的衡量方法加以度量,即链路质量度量。为充分度量空地网络中有线链路与无线链路的区别,本文提出了一种新的度量方式mETT(mobility ETT),该度量方法能够同时反映链路在时延、带宽、丢包和稳定度方面的性能。最后利用OPNET仿真工具对扁平化路由机制和综合度量方式mETT进行了仿真验证。最终证明扁平化路由机制在包发送率和时延等性能上优于传统的分层路由机制,mETT能够综合度量链路在丢包、时延、带宽和稳定度四方面的性能。将逻辑扁平化路由机制与mETT应用于空地网络,可以减小临近空间平台的设计复杂度,并提升空地网络的传输性能。
[Abstract]:In order to realize the global coverage of the land communication network to the mountains and oceans, and to deal with the damage caused by natural disasters such as earthquakes and hurricanes, it is necessary to study and construct the integrated network of space and earth. The adjacent space network in the integrated air space network is located in the middle of the satellite network and the ground network, and plays an important role in the integration of space and earth networks. In this paper, the integrated network of space and earth is taken as the whole research background, and the two-layer air-to-ground network composed of the adjacent space network and the ground network is mainly studied, and the satellite network is taken as the important supplement of the air-to-ground network at the same time. This paper focuses on the routing problem of air-to-ground networks. This paper first introduces the open-ground network system, including the network architecture and the characteristics of each subnet. In order to route in such a system, this paper summarizes the existing routing, synthesizes the characteristics of the air-to-ground network, and explains the need to adopt dynamic semi-centralized and semi-distributed integrated routing design method in the air-to-ground network. Then according to the current situation of the research on the air-to-ground network routing and the requirements of the air-to-ground network routing the logical flattening routing mechanism is designed. This mechanism flattens the air-ground double-layer network topology and forms a single-layer network topology containing the topology information of the whole air-ground network. The optimal routing can be obtained by using this topology for routing computation. In order to realize the logical flattening routing mechanism, it is necessary to measure the different nature of the link through the same measurement method, that is, the link quality measurement. In order to fully measure the difference between wired and wireless links in air-ground networks, a new measurement method, mETT (mobility ETT), is proposed, which can simultaneously reflect the performance of links in terms of delay, bandwidth, packet loss and stability. Finally, the flat routing mechanism and synthetic metric mETT are simulated with OPNET simulation tools. Finally, it is proved that the flat routing mechanism is superior to the traditional hierarchical routing mechanism in packet sending rate and delay, and mETT can comprehensively measure the performance of the link in terms of packet loss, delay, bandwidth and stability. The application of logical flattening routing mechanism and mETT to the air-to-ground network can reduce the design complexity of the adjacent space platform and improve the transmission performance of the air-to-ground network.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN915.02

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