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Multicast routing algorithms with low tree cost for LEO satellite networks
Cheng Lianzhen, Zhang Jun, Liu Kai*
School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ Ϊ�˽���͹��������������е���Դ�鲥�㷨���ŵ���Դ�˷�����,�����һ�׵��˹������鲥�㷨,������Ⱥ�ϲ�������(CCST)�ͼ�Ȩ����Ⱥ�ϲ�������(��w��-CCST)�㷨.CCST�㷨������̬��������(DAC)ѡ�˷����ͺ���Ⱥ�ϲ��鲥·����������.�ں���Ⱥ�ϲ�������,�Ժ˽ڵ���Ϊ��ʼ����Ⱥ,ͨ������Ⱥ��ʣ�����Ա�����·����������չֱ�������鲥���������,�Ӷ����������������������.�ڪ�w��-CCST�㷨��,ͨ��������Ȩ���ӿ����ʶ����������ۡ����Ͷ˵��˴���ʱ��,��֧��ijЩʱ������Ҫ���ϸ��ʵʱҵ��.������˵��,CCST�㷨�����������ܱ������㷨����������,��w��-CCST�㷨�Ķ˵��˴���ʱ�����ܺ���CCST�㷨.
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Abstract�� To resolve the channel resources waste problem of the typical source-based multicast routing algorithm in low earth orbit (LEO) satellite networks, a new core-based shared tree algorithm called the core-cluster combination shared tree (CCST) algorithm and its improved one (i.e. ��w��-CCST algorithm) were proposed. The (��w��-)CCST algorithm consists of the dynamic approximate center (DAC) core selection method and the (weighted) core-cluster combination multicast routing construction method. The core-cluster combination method takes core node and its nearest group member in hops as initial core-cluster, and extends it to construct entire multicast tree step by step by a shortest path scheme between newly-generated core-cluster and surplus group members, which can greatly improve transport bandwidth utilization. In the ��w��-CCST algorithm, a weighted factor was proposed to decrease end-to-end propagation delay and meanwhile increase tree cost a bit to support some real-time applications with strict delay requirements. Simulation results show that tree cost performance of the CCST algorithm is greatly better than that of other algorithms, while end-to-end propagation delay performance of the ��w��-CCST algorithm is better than that of the CCST algorithm.
Keywords�� satellite networks   LEO   multicast   shared tree   core selection     
Received 2006-07-01;
Fund:

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������, �ž�, ����.�������۵ĵ͹����������鲥�㷨[J]  �������պ����ѧѧ��, 2007,V33(07): 821-825
Cheng Lianzhen, Zhang Jun, Liu Kai.Multicast routing algorithms with low tree cost for LEO satellite networks[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2007,V33(07): 821-825
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