一种基于遗传算法的半动态应用层多播协议

将半动态应用层多播通信分解为静态起始和动态维护两种阶段交替出现的过程．在起始阶段．采用基于遗传算法的多播路由机制构建优化的静态多播树；在维护阶段，采用拓扑维护机制、路由性能监控机制和路由更新机制．对多播拓扑的动态进行快速响应．仿真结果表明．该协议同时具备优化多播树性能和快速维护多播拓扑的能力，改善了通信过程中多播树的整体性能．

An unitary dynamic application layer multicast protocol based on genetic algorithms

Application layer multicasting process is divided into two phases, starting phase and maintaining phase. Based on system modeling and performance evaluating analysis, a protocol based on genetic algorithms is proposed to handle the both phases. During the starting phase, routing scheme based on genetic algorithms is used to optimize the overall performance of original multicast tree under several constraints. During the maintaining phase, topology recovery scheme, performance watching scheme and route updating scheme are proposed to quickly handle the frequent topology dynamics. Numerical simulations show that, compared to existing protocols, the proposed protocol improves the performance of original multicast tree and the average performance of multicast tree during the multicast process.