bittorrent协议中激励机制的设计与分析

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1、ISSN1673．9418CODENJKYTA8E—mail：fcst@vip．163．comJournalofFrontiersofComputerScienceandTechnologyhttp：／／www．ceaj．org1673-9418／2014／O8(03)一0275—13Tel：+86．10．89056056doi：10．37788．issn．1673-9418．1307014BitTorrent协议中激励机制的设计与分析贾垒，刘靖，马燕林，叶新铭内蒙古大学计算机学院，呼和浩特010021DesignandAnalysisofIncentiveMechanisminBitTor

2、rentProtocolJIALei，LIUJing，MAYanlin，YEXinmingCollegeofComputerScience，InnerMongoliaUniversity,Hohhot010021，China+Correspondingauthor：E-mail：liujing@imu．edu．cnJIALei，LIUJing，MAYanlin，eta1．DesignandanalysisofincentivemechanisminBitTorrentprotoco1．JournalofFrontiersofComputerScienceandTechnology,2014，

3、8(a)：275-287．Abstract：IncentivemechanismplaysasignificantpartinBitTorrentprotoco1．Itencouragespeerstouploadmoreresourcesinordertoobtainbetterdownloadrate，andimprovesthewholesystemsharingperformance．However,theoriginalincentivemechanisminBitTorrentprotocolallowssuchkindsoffree—ridingnodes，whichbring

4、badincentiveefects．Thispaperproposesanovelincentivemechanismwithdetailedalgorithmforitspracticalapplication．Inordertomakemoreaccurateandsoundanalysisforthisnovelincentivemechanism，thisP印erfirstlyconstructsitscoloredPetrinets(CPN1basedformalmodel，thenvalidatestheaccuracyofthismodel，finallycarriesout

5、theperformanceanalysisf0rtheBitTorrentprotocolwithnewproposedincentivemechanismusingmodelsimulation．TheperformanceanalysisresultsshowthatthenovelincentivemechanismCanprovidemorestrictrestrictiontofree—ridingnodebehaviorsandarchivebeterincentiveefects．Keywords：BitTorent；incentivemechanism；coloredPet

6、rinets(CPN)；modelsimulation摘要：激励机制是BitT0rrent协议的重要组成部分，它鼓励用户上传以获得更快的下栽速度，并提高系统整体性能。原有BitT0rrent激励机制存在大量的搭便车节点，极大影响了激励效果，因此提出了一种新的激励策略，并给出了具体的实施算法。对应用这种新激励机制的BitTorrent协议进行了详细的着色Petri网(coloredPetri十TheNationalNaturalScienceFoundationofChinaunderGrantNo．61262017(国家自然科学基金)；theKeyProgramofNaatralScienc

7、eFoundationofInnerMongoliaofChinaunderGrantNo．20080404ZD20(内蒙古自然科学基金重点项目)．Received2013-06，Accepted2013-08．CNKI网络优先出版：2013—10．15，http：／／www．cnki．net／kcms／detail／11．5602．TP．20131015．1015．001．html276JournalofF