计算机工程与设计
計算機工程與設計
계산궤공정여설계
COMPUTER ENGINEERING AND DESIGN
2014年
7期
2447-2452
,共6页
P2P流媒体%数据驱动%数据调度%分片优先级%节点调度
P2P流媒體%數據驅動%數據調度%分片優先級%節點調度
P2P류매체%수거구동%수거조도%분편우선급%절점조도
P2P streaming%data-driven%data scheduling%chunk priority%peer scheduling
对Mesh结构的对等流媒体系统中的数据调度问题进行了研究。进行了优化算法的分析，利用本地多级缓存来提高数据分片在节点间的分发能力，在此基础上通过将分片播放紧急度和稀缺度加权合并来定义数据优先请求级别；分析了影响节点上传能力的多种因素，采用历史信息统计法来估算节点上传能力，提出基于数据优先级和节点能力评估的对等流媒体数据调度算法。仿真结果表明，基于数据优先级和节点能力评估的调度算法在节点扰动性较强的网络环境中能较好保证节点播放的连续性和数据分片上传能力。
對Mesh結構的對等流媒體繫統中的數據調度問題進行瞭研究。進行瞭優化算法的分析，利用本地多級緩存來提高數據分片在節點間的分髮能力，在此基礎上通過將分片播放緊急度和稀缺度加權閤併來定義數據優先請求級彆；分析瞭影響節點上傳能力的多種因素，採用歷史信息統計法來估算節點上傳能力，提齣基于數據優先級和節點能力評估的對等流媒體數據調度算法。倣真結果錶明，基于數據優先級和節點能力評估的調度算法在節點擾動性較彊的網絡環境中能較好保證節點播放的連續性和數據分片上傳能力。
대Mesh결구적대등류매체계통중적수거조도문제진행료연구。진행료우화산법적분석，이용본지다급완존래제고수거분편재절점간적분발능력，재차기출상통과장분편파방긴급도화희결도가권합병래정의수거우선청구급별；분석료영향절점상전능력적다충인소，채용역사신식통계법래고산절점상전능력，제출기우수거우선급화절점능력평고적대등류매체수거조도산법。방진결과표명，기우수거우선급화절점능력평고적조도산법재절점우동성교강적망락배경중능교호보증절점파방적련속성화수거분편상전능력。
The problem of data scheduling in Mesh-pull P2P streaming systems was investigated and the optimization of schedu-ling algorithms were analyzed.A multi-level buffer mechanism was presented to accelerate chunk distributing among peers, which divided the local buffer into receiving buffer,forwarding buffer and playback buffer.Firstly,based on multi-level buffers, the definition of chunk priority was given,according to data emergency degree in local play buffer and scarcity degree in neigh-bor’s forwarding buffer.Secondly,the factors which influence the peer’s upload capacity were analyzed.Then the implementa-tion of algorithm on data scheduling was given based on chunk priority and peer upload capacity in data-driven P2P streaming sys-tems.Simulation results showed that,even in high dynamic circumstances of P2P network,the new scheduling algorithm could provide better playback continuity and upload capacity.
