Research And Implementation Of Adaptive Demand-driven Multicast Routing Protocol Based On Relative Mobility Of Nodes

Mobile Ad hoc network is a kind of multi-hop, temporary, self-organizing wireless network, which is composed by a group of mobile terminal with wireless communication transceiver devices, and it can quickly build up a mobile communication network at any time and any place. As the application requirements change, the fast and flexible features of mobile Ad hoc network make it has wide application value in military communication, emergency services, disaster rescue, personal area networks, mobile meetings, wireless access fields and so on.As the radio channel in mobile Ad hoc network has potential of broadcasting capacity, multicast is more suitable for mobile Ad hoc networks. But traditional wire networks’ multicast routing protocols can not be directly used in mobile Ad hoc network. Therefore, the multicast routing protocol design for mobile Ad hoc network become a research hotspot. Currently, the researchers proposed a number of multicast protocols for mobile Ad hoc network. These protocols can be divided into tree-based, based on the grid structure, hybrid and stateless multicast routing protocol. Which, ADMR protocol is considered as a good performance multicast routing protocol based on tree structure. ADMR is excellent in efficiency and scalability, but its robustness and real-time are not good enough.To solve this problem, this paper presents a kind of Relative Mobility of Nodes based Adaptive demand-driven multicast routing protocol, abbreviated RMNAM. RMNAM protocol inherites the on-demand features of ADMR protocol, and introduces the concept of relative mobility of nodes. On the one hand, the protocol uses the relative mobility of nodes as an important factor in multicast forwarding tree routing, which improves the robustness of the multicast forwarding tree; on the other hand, the protocol optimizes the transmission switching strategy of source node by consulting the global repair frequency of receiving nodes and the average relative mobility of nodes to make it better adaptability. Finally, the author makes multi-scenario performance comparison on RMNAM, ADMR and ODMRP based on grid using the NS2network simulation software. The simulation results show that RMNAM protocol is better than ADMR protocol in the packet delivery ratio and transmission delay, and it keeps the advantages of effectiveness and scalability compared with ODMRP.