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�������պ����ѧѧ�� 2012, Vol. 38 Issue (5) :648-653    DOI:
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Network coding-aware opportunistic forwarding mechanism in wireless multi-hop networks
Yuan Yongqiong, Zhang Jun, Wang Yun*
School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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ժҪ ���һ�����������߶����������������֪�Ļ���ת������(NCAOF, Network Coding-Aware Opportunistic Forwarding).NCAOF���������ŵ��Ĺ㲥����,��ϻ���ת�����������,��̬ȷ���б������Ľڵ���б�������ת��,�Ӷ��ȴ�ͳ�IJ���Ԥ���ڵ��ת�����ƻ�ø���������.����ת��������,�м�ڵ㿼�Ǿֲ�������Ϣ�����������,ͨ������ı������溯�������ڵ�Ļ���ת��Ч��,��̬ѡ���ܻ�ȡ�������ܸ��õķ�����л������,�����ڱ������渳�Ա�����鶯̬��ת�����ȼ�,��Ч���ñ������ͬʱ��������ת��.ʵ��������,��ȴ�ͳ�Ļ�����������ת������,NCAOF�ܻ�ø��õı������,����Ч�����������������ͷ����ʹ���.
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Abstract�� A network coding-aware opportunistic forwarding (NCAOF) mechanism was proposed to overcome the defects of COPE with passive coding. Taking advantage of broadcast characteristic of wireless channel, NCAOF combines the features of opportunistic forwarding and network coding. Compared with traditional methods using predetermined route forwarding mechanism, NCAOF can create more coding opportunities. In delivering packets process, the intermediate node employs the defined coding gain function to evaluate how much the opportunistic coding gain can be obtained if some packets are coded together. Then some packets are selected to encode together based on the computed coding gain, dynamically and intelligently. NCAOF assigns a higher dynamic priority according to coding gain function to forwarding the encoded packets than the native packets. The simulation results show that NCAOF can achieve a remarkable improvement in terms of the network throughput and packet delivery fraction for delivering packets in wireless multi-hop networks.
Keywords�� wireless network   network coding   opportunistic forwarding     
Received 2011-10-08;
Fund:������Ȼ��ѧ����������Ŀ (60921001); �����ص�����о���չ�ƻ�(973)������Ŀ(2011CB707000); �����ش�ר��������Ŀ (2009ZX03006-001-003)
Ԭ����, �ž�, ���S.���߶�����������������֪�Ļ���ת������[J]  �������պ����ѧѧ��, 2012,V38(5): 648-653
Yuan Yongqiong, Zhang Jun, Wang Yun.Network coding-aware opportunistic forwarding mechanism in wireless multi-hop networks[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2012,V38(5): 648-653
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2012/V38/I5/648
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