A NOVEL FRAMEWORK OF ONLINE NETWORK CODING FOR MULTICAST SWITCHES WITH CONSTRAINED BUFFERS  

作　　者：Wang Wei Yu Li Zhu Guangxi Li Hui 

机构地区：[1]Wuhan National Laboratory for Optoelectronics, Division of Communiction ＆ Intelligent Networks,Department of Electronics and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China [2]Shenzhen Key Lab of Cloud Computing Technology ＆ Application, Shenzhen Graduate School, Peking University, Shenzhen 518055, China

出　　处：《Journal of Electronics(China)》2011年第4期460-467,共8页电子科学学刊（英文版）

基　　金：Supported by the National 863 Projects of China(2009AA01Z205);the Fund of National Laboratory(P080010);the Natural Science Foundation of China(60872010,60972016);the Program for New Century Excellent Talents in University (NCET070339);the Funds for Distinguished Young Scientists of Hubei,China(2009 CDA150)

摘　　要：Network coding is able to address output conflicts when fanout splitting is allowed for multicast switching.Hence,it successfully achieves a larger rate region than non-coding approaches in crossbar switches.However,network coding requires large coding buffers and a high computational cost on encoding and decoding.In this paper,we propose a novel Online Network Coding framework called Online NC for multicast switches,which is adaptive to constrained buffers.Moreover,it enjoys a much lower decoding complexity by a Vandermonde matrix based approach,as compared to conven-tional randomized network coding Our approach realizes online coding with one coding algo-rithm that synchronizes buffering and coding.Therefore,we significantly reduce requirements on buffer space,while also sustaining high throughputs.We confirm the superior advantages of our contributions using empirical studies.Network coding is able to address output conflicts when fanout splitting is allowed for multicast switching.Hence,it successfully achieves a larger rate region than non-coding approaches in crossbar switches.However,network coding requires large coding buffers and a high computational cost on encoding and decoding.In this paper,we propose a novel Online Network Coding framework called Online NC for multicast switches,which is adaptive to constrained buffers.Moreover,it enjoys a much lower decoding complexity by a Vandermonde matrix based approach,as compared to conven-tional randomized network coding Our approach realizes online coding with one coding algo-rithm that synchronizes buffering and coding.Therefore,we significantly reduce requirements on buffer space,while also sustaining high throughputs.We confirm the superior advantages of our contributions using empirical studies.

关 键 词：Packet switching MULTICAST Network coding Vandermonde matrix 

分 类 号：TN911[电子电信—通信与信息系统]