IP组播行为的生灭模型  

Birth-death model of IP multicast group behavior

作　　者：杜可亮[1] 张轩[1] 李星[1] 李崇荣[1] 

机构地区：[1]清华大学信息网络工程研究中心,北京100084

出　　处：《清华大学学报（自然科学版）》2004年第1期134-137,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(69999610)

摘　　要：为了组播应用尤其是组播安全,研究IP组播的用户的动态行为规律具有重要的意义。以组播应用中组成员加入和退出组的动态过程为研究对象,根据组用户加入和退出组行为的无记忆性,认为组播组的成员数为一个连续时间、离散状态的Markov过程,采用概率论方法,推出IP组播行为的生灭模型。模型表明,单位时间内用户加入和退出组的次数正比于组成员数。用MBone运行的实测数据对模型进行验证,证明生灭模型能够很好地近似组播成员的加入和退出行为。The dynamic behavior law of IP multicast group members is valuable for multicast application especially multicast security. This paper focuses on the dynamic join-leave process of multicast group members, supposes the number of members be a time continuous, state discrete Markov process according to the non-mnemonic property of the members' join-leave behavior, and deduces the birth-death model of IP multicast group behavior using probability mathematic method. The model shows that times of members' joining and leaving group in a unit time are proportional to the number of multicast group members. The data collected from MBone was used to verify the modeling. The results prove the birth-death model can perfectly descript the join-leave behavior of the multicast group members.

关 键 词：IP组播 网络应用 组播用户行为 生灭过程 组播安全 生灭模型 组播通信 

分 类 号：TN915.08[电子电信—通信与信息系统]