基于SPN的IMS系统可生存性建模及分析  

Modeling and Analysis of Survivability of IP Multimedia Subsystem Based on SPN

作　　者：赵明峰[1,2] 周亚建[2] 任东晓[1] 杨义先[1,2] 

机构地区：[1]电子科技大学计算机科学与工程学院,成都610054 [2]北京邮电大学灾备技术国家工程实验室,北京100876

出　　处：《应用科学学报》2012年第3期239-244,共6页Journal of Applied Sciences

基　　金：国家重大科技专项基金(No.2009ZX03004-003-03;No.2010ZX03003-003-01);国家"973"重点基础研究发展计划基金(No.2007CB310704)资助

摘　　要：IP多媒体子系统(IP multimedia subsystem,IMS)作为网络与业务融合的标准将会在三网融合中扮演重要的角色,因此研究其认证注册过程的可生存性具有重要意义.文中首先给出可生存性概念与评价指标以及I.MS的认证注册过程,然后建立相应的随机Petri网(stochastic Petri net,SPN)模型和简化的可生存性SPN模型,并给出可生存性的主要指标——可靠性、可维护性及可用性.对所建模型的可靠性及可维护性评价指标进行了仿真,表明可靠性分别随时间及失效率的增加而显著降低,可维护性随时间及修复率的增加而明显增强并最终趋于稳定.这些结论为增强IMS系统可生存性能力提供了有效的数值参考依据.As one of network and business integration standard, IP multimedia subsystem （IMS） plays an important role in network convergence. It is important to anMyze the authentication and registration process, and build a survivability model for IMS. Having defined survivability and its attributes, this paper proposes a survivability stochastic Petri net （SPN） model and its simplified version, and analyzes the survivability attributes including reliability, maintainability and availability. Simulation results show that the measures of survivability vary with time, failure rate and repair rate, respectively. Reliability is reduced with the increase of time and failure rate, and maintainability enhanced with the increase of time and repair rate. This study provides useful clue for improving survivability of IMS systems.

关 键 词：随机PETRI网 IP多媒体子系统 可生存性 

分 类 号：TP371.9[自动化与计算机技术—计算机系统结构]