计算机科学与探索
計算機科學與探索
계산궤과학여탐색
JOURNAL OF FRONTIERS OF COMPUTER SCIENCE & TECHNOLOGY
2015年
7期
832-838
,共7页
韦娟%薄振雨%刘叶%雷秀英
韋娟%薄振雨%劉葉%雷秀英
위연%박진우%류협%뢰수영
LEO卫星网络%非对称%路由算法%链路检测
LEO衛星網絡%非對稱%路由算法%鏈路檢測
LEO위성망락%비대칭%로유산법%련로검측
LEO satellite networks%asymmetric%routing algorithm%link detection
提出了一种基于分时的LEO卫星网络非对称路由算法A-DTRA(asymmetric discrete time based routing algorithm)。针对网络节点在各时间片内的链路连接状态,该算法通过中心节点两次广播来获取一跳邻节点信<br> 息及其邻节点的邻居节点信息,从而完成了链路检测,得到每个时间片内的有向虚拟拓扑图。通过使用备份路由和路由表压缩机制实现了非对称链路上分组转发的可靠性,失效节点处理的及时性以及星上节点开销的低耗性。通过仿真分析可知,该算法具有较好的数据包转发率和端到端时延性能。此外,利用非对称链路可提高网络的连通性能,该算法适用于存在非对称链路的LEO卫星网络。
提齣瞭一種基于分時的LEO衛星網絡非對稱路由算法A-DTRA(asymmetric discrete time based routing algorithm)。針對網絡節點在各時間片內的鏈路連接狀態,該算法通過中心節點兩次廣播來穫取一跳鄰節點信<br> 息及其鄰節點的鄰居節點信息,從而完成瞭鏈路檢測,得到每箇時間片內的有嚮虛擬拓撲圖。通過使用備份路由和路由錶壓縮機製實現瞭非對稱鏈路上分組轉髮的可靠性,失效節點處理的及時性以及星上節點開銷的低耗性。通過倣真分析可知,該算法具有較好的數據包轉髮率和耑到耑時延性能。此外,利用非對稱鏈路可提高網絡的連通性能,該算法適用于存在非對稱鏈路的LEO衛星網絡。
제출료일충기우분시적LEO위성망락비대칭로유산법A-DTRA(asymmetric discrete time based routing algorithm)。침대망락절점재각시간편내적련로련접상태,해산법통과중심절점량차엄파래획취일도린절점신<br> 식급기린절점적린거절점신식,종이완성료련로검측,득도매개시간편내적유향허의탁복도。통과사용비빈로유화로유표압축궤제실현료비대칭련로상분조전발적가고성,실효절점처리적급시성이급성상절점개소적저모성。통과방진분석가지,해산법구유교호적수거포전발솔화단도단시연성능。차외,이용비대칭련로가제고망락적련통성능,해산법괄용우존재비대칭련로적LEO위성망락。
This paper proposes an asymmetric discrete time based routing algorithm (A-DTRA) for LEO satellite networks. To the links state among each consecutive time intervals, this algorithm realizes links detection for satel-lite networks by central node broadcasting message twice, and each node has the knowledge of its direct 1-hop neighbors and the neighbors of its neighbors. So the directional virtual typology network can be obtained to every consecutive time intervals. The backup routing and routing table compression mechanism are used in routing algo-rithm, which can realize the reliability of the packet forwarding on asymmetric link, the timeliness of failure node disposal and the low consumption of satellite nodes overhead. Simulation results show that the connectivity of the network can be improved by A-DTRA, and the packet delivery ratio and the average end-to-end delay are superior to those by DTRA. It is well suitable for LEO satellite networks with asymmetric links.