基于H.323协议的分布式网守研究

基于H.323协议的视讯会议系统的可扩展性与网守(GK,Gatekeeper)结构密切相关.提出了一种多区域分 布式网守架构, 提供了多媒体视讯会议系统在大规模网络部署的方案.这种分布式结构不仅 克服了集中式和分层式模型的缺点,还很好地解决了网守之间的负载平衡问题.终端之间的 跨区域通信通过基于别名规则的信令消息路由方法来实现,网守通过扩散和逆向学习法自动 生成信令消息散列表.考虑到网守之间的负载平衡问题,本架构在区域内采用集中式管理模 型,并提出了基于负载因子最小平衡算法(BLFA,Balancing Load Factor Algorithm)的网守负载平衡解决方案.

Study on H.323-based distributed gatekeepers

The scalability of H.323-based video conferencing system is closely related to the architecture of gatekeeper(GK).A distributed H.323 gatekeeper architecture based on multiple zones was proposed,providing the solution for the deployment of multimedia video conferencing system on the large scale network.This architecture did not only conquer the drawback of centralized architecture and hierarchical architecture,but could balance the load between gatekeepers.Design of GK-level signaling message routing based on alias format was used to solve the communication problem between endpoints registered in different zones.In the zone,the centralized architecture was adopted and the main-GK managed the slave-GKs.Balancing load factor algorithm(BLFA) was presented to balance the load between gatekeepers.