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�������պ����ѧѧ�� 2006, Vol. 32 Issue (07) :788-792    DOI:
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LEO/MEO˫���������ķֲ㶯̬·���㷨
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Dynamic routing algorithm for LEO/MEO double-layered satellite networks
Yuan Zhe, Zhang Jun, Liu Zhongkan*
School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ �ɵ͹�LEO(Low Earth Orbit)���й�MEO(Medium Earth Orbit)���ǹ��ɵ�˫������������нϺõ�����ͨ������.����MEO��LEO�����ڳ����̾�ͨ���е�����,���һ�ֲַ㡢�ֲ�ʽ��˫����������̬·���㷨.ͨ��������·״̬��Ϣ�ĺ鷺,LEO����ֻ�����վֲ����˼�����ɶ̾�ҵ��ͨ��,����ͨ��ҵ������MEO���dz���.���Ǽ���·��ʣ������ʱ����������·��Ȩ����,·�ɼ����·�����ۺϿ�����ʱ�������ʱ��˫�����ص�����·��.�������������㷨��ʱ�ӡ�·�ɿ���������ҵ�����ֲ��ȷ��涼���нϺõ�����,��������ϵͳʵ��.
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Abstract�� Double-Layered satellite networks consisting of LEO(low earth orbit) and MEO(medium earth orbit) satellites have advantages on networking and communication performances. Based on the advantages of MEO and LEO satellites in long-distance and short-distance communications respectively, a hierarchical and distributed dynamic routing algorithm named DLRA (double-layered satellite-network routing algorithm) was proposed. By controlling flood of link state information, LEO satellites could acquire local topology information to route the short-distance traffics. The long-distance traffics were routed in MEO layer. The residual lifetime of the ISL (inter-satellite link) was considered in the path weight calculation in this algorithm. The selected path was optimal in path delay and duration. The simulation results show that DLRA has better performances in end-to-end delay, routing overhead and traffic flow distribution, and is easy to be applied.
Keywords�� satellite communication systems   network protocols   inter-satellite links   routing algorithm     
Received 2005-08-11;
Fund:

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About author: Է ��(1977-),��,����������,��ʿ��,yuan zhe1977@yahoo.com.cn.
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Է��, �ž�, ���ؿ�.LEO/MEO˫���������ķֲ㶯̬·���㷨[J]  �������պ����ѧѧ��, 2006,V32(07): 788-792
Yuan Zhe, Zhang Jun, Liu Zhongkan.Dynamic routing algorithm for LEO/MEO double-layered satellite networks[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2006,V32(07): 788-792
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