【摘要】：多層衛(wèi)星網絡的拓撲結構具有明顯的時變特征,難以提供持續(xù)且穩(wěn)定的端到端路徑,導致高效路由問題面臨著巨大的挑戰(zhàn).將衛(wèi)星網絡設計為封閉的體系結構,采用強管理或調度式控制策略會導致其無法自由、高效地實現與其它系統(tǒng)的協(xié)同組網.基于IP的網絡體系結構在應用于多層衛(wèi)星網絡時又存在路由效率不高的問題.基于命名數據網絡NDN(Named Data Networking)體系結構,提出一種多層衛(wèi)星網絡分布式路由方法——SNDN(Satellite Named Data Networking).根據鏈路切換的周期性和可預知性,以時變圖為建模工具,設計一個能自適應稠密和稀疏場景的路由算法來動態(tài)地計算時間相關的最快路徑并附加為源路由信息,充分利用命名數據網絡數據驅動的通信模式、數據包級的安全特性和逐跳轉發(fā)的特點,由節(jié)點在包轉發(fā)的過程中動態(tài)地完成轉發(fā)表(FIB,Forwarding Information Base)和請求狀態(tài)表(PIT,Pending Interest Table)的構建.可為面向未來空、天、地一體化協(xié)同組網的多層衛(wèi)星網絡路由研究提供一種新的思路.通過仿真實驗及對比分析,驗證了SNDN在路由效率和多播性能方面的優(yōu)勢.
[Abstract]:The topology of multilayer satellite networks has obvious time-varying characteristics, and it is difficult to provide continuous and stable end-to-end paths, which leads to great challenges for efficient routing problems. The satellite network is designed as a closed system structure, and the strong management or scheduling control strategy will lead to its freedom and efficient implementation of cooperative networking with other systems. IP-based network architecture has the problem of low routing efficiency when it is applied to multi-layer satellite networks. Based on the NDN (Named Data Networking) architecture of named data network, a distributed routing method for multi-layer satellite network is proposed: SNDN (Satellite Named Data Networking). According to the periodicity and predictability of link switching, using time-varying graph as a modeling tool, a routing algorithm is designed to dynamically calculate the time-dependent fastest path and attach it as source routing information. Taking full advantage of the data driven communication mode of named data network, the security characteristics of data packet level and the characteristics of jump forward, the node dynamically completes the construction of forwarding Information Base) and request pending Interest Table) in the process of packet forwarding. It can provide a new way for the research of multi-layer satellite network routing in the future. The advantages of SNDN in routing efficiency and multicast performance are verified by simulation and comparative analysis.
【作者單位】： 武漢大學計算機學院;地球空間信息技術協(xié)同創(chuàng)新中心;武漢大學測繪學院;
【基金】：國家自然科學基金(No.61373040,No.61572370)
【分類號】：TN927.2

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