基于OPNET的按需组播路由协议仿真

Simulation of on demand multicast routing protocol based on OPNET

按需组播路由协议(ODMRP)是一种针对移动自组织网络的组播路由协议,该协议在源节点和接收节点之间建立网格进行数据传输,具有冗余路径、不依赖单播路由、健壮性高等特点。目前尚缺乏对于ODMRP的建模和仿真研究。针对此问题,基于OPNET仿真环境完成了对ODMRP的建模,建立了该协议的有限状态机(FSM)、节点模型、网络模型以及包格式,基于C语言编程实现了路由的建立、更新、维护和数据传输过程。通过设置不同的参数和统计量,仿真检验了协议性能,包括网络的端到端延时和数据包递交率与节点移动速度和组播组尺寸之间的定量关系,证明了所建立的协议模型的功能正确性。仿真结果表明,ODMRP协议适用于诸如战场通信、灾难救助、体育比赛、大型会展等需要临时组网进行组播通信的应用场合。

On Demand Multicast Routing Protocol(ODMRP)is a multicast routing protocol for mobile Ad Hoc networks.It creates meshes between the source node and receiver nodes for data transfer,and has the characteristics of redundant paths,independence on unicast routing,and high robustness.At present,there is still a lack of modeling and simulation research on ODMRP.To this end,based on the OPNET simulation kit,a model set was built for ODMRP,including FSM(Finite State Machine),node model,network model and packet format.The processes of route establishing,refreshing,maintenance and data transmission were implemented by C programming.With a set of parameters and statistics,a group of simulation experiments were implemented to check its performance,including the quantitative relations between end-to-end delay and packet delivery ratio with node moving speed and multicast group size.It was proved that the built models were functionally correct.Simulation results show that ODMRP is very suitable for the applications with the need of temporarily networking for multicast communications,such as battlefield communications,disaster rescuing,sport games,and large exhibitions.