北京邮电大学学报

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北京邮电大学学报

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基于随机进程代数的Overlay网络上的QoS性能评价

潘耘;王励成;余镇危;梁辉   

  1. 中国传媒大学计算机学院
  • 收稿日期:2009-04-13 修回日期:1900-01-01 出版日期:2009-04-28 发布日期:2009-04-28
  • 通讯作者: 潘耘
  • 基金资助:
     

Based on Stochastic Process Algebra OverlayNetwork QoS Performance Evaluation

    

  1.  
  • Received:2009-04-13 Revised:1900-01-01 Online:2009-04-28 Published:2009-04-28
  • Supported by:
     

摘要: 论述了对Overlay网络中组播的服务质量进行量化评价的必要性,引入了组播树二度同胚约简的概念,推广了Bowman评价单播数据流服务质量的随机进程代数方法,提出用随机进程代数对Overlay网络中组播的服务质量进行评价的建模方案,并用PEPA workbench模拟工具针对具体的组播实例的服务质量进行了定量分析. 模拟结果表明,传统网络中的IP组播抖动小于Overlay网络中的组播抖动;而后者又进一步小于在传统网络中用单播技术来实现组播时的抖动, 与实际情况吻合.

关键词: 随机进程代数, overlay, 服务质量

Abstract: The arguments on the necessary for quantized evaluation toward quality of services (QoS) of multicast in Overlay networks are given. The concept of twodegree homeomorphism reduction multicast tree is introduced, extend Bowman’s method for evaluating QoS of unicast dataflow by using stochastic process algebra (SPA) is promoted, a modeling scheme is proposed for quantized evaluating QoS of concrete multicast instances in Overlay networks with simulation tool PEPA workbench. Simulation suggests that the jitter of IP multicast is lighter than the jitter of Overlay multicast, and the latter is further lighter than the jitter of multicast by using unicast technique.

Key words: stochastic process algebras, overlay, quality of services

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