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�������պ����ѧѧ�� 2009, Vol. 35 Issue (4) :449-452    DOI:
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Packet scheduling for AFDX switch under hard time constraints
Zhou Qiang, Xiong Huagang, Zhang Xiaolin, Zhang Yanzhong*
School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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ժҪ �о��˺��յ���ȫ˫������ʽ��̫��(AFDX,Avionics Full Duplex Switched Ethernet)������������ȷ�����ʵʱ����,����ʵʱͨ���е�����������ģ��,����AFDXЭ��"ȷ��������"�й��ڽ�����֧��˫���ȼ���Ϣ����ԭ��,�Ƶ�������Ӧ�Ľ������ؼ���������ѧ���,�����ǿʵʱԼ���»���˫���ȼ����ȵĸ���ƥ��ķ�����ȷ���(DP-LM,Dual Priority-Load Match),�Ƚ��˵�/˫���ȼ�������ȵIJ�ͬ(��Ϣ���ȡ��ؼ�������ƥ�䷽��),�����������:���ڵ����ȼ���Ϣ�����뽫��Ը����ȼ���Ϣ��ʵʱ���������ҪӰ��.
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Abstract�� AFDX(avionics full duplex switched Ethernet) is a switched interconnection designed to meet requirements related to the ever increasing demand for civil aircraft such as A380. A packet scheduling scheme on hard real-time performance in AFDX switch was studied. Based on the dual-priority-message scheduling principle of AFDX protocol, an analytical expression of its key parameter was derived, and a new packet scheduling scheme(DP-LM, dual priority-load match) under hard real time constraints was proposed. The different factors such as scheduling progress, key parameter and load-match method between dual-priority-message scheduling and single-priority-message one were deeply compared, and example resultants indicate that low priority message can impact on real time transmission for high priority one.
Keywords�� avionics   packet switching   switch   AFDX(avionics full duplex switched ethernet)     
Received 2008-04-18;
About author: �� ǿ(1974-),��,����֣����,��ʦ,zhouqiang_ee@buaa.edu.cn.
�� ǿ, �ܻ���, ������, ������.AFDX��������ǿʵʱ�����µķ������[J]  �������պ����ѧѧ��, 2009,V35(4): 449-452
Zhou Qiang, Xiong Huagang, Zhang Xiaolin, Zhang Yanzhong.Packet scheduling for AFDX switch under hard time constraints[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2009,V35(4): 449-452
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