航空自组网络组播路由协议的研究

发布时间：2018-03-17 03:24

本文选题：分层自组织网络　切入点：组播路由协议　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年来,移动自组织网络MANET(Mobile Ad Hoc Network)在世界范围内得到了广泛的研究,这是因为MANET不依赖于固定的基础设施,并且具有自组织,覆盖范围广,抗毁能力强等特点。与此同时,在网络中为了满足一对多的通信,组播路由技术也变得越来越重要。因此本文对航空自组网络组播路由协议进行了研究。本文中的航空自组网络具有分层的特点,包括骨干网层和子网层,其中,骨干网拓扑比较稳定,并且可以获取链路持续时间和单播路由信息;而子网拓扑变化则比较频繁。传统的MANET组播路由协议大多数并不满足具有分层特点的网络,并且协议开销较大,有时会因为链路的频繁断开而导致数据的丢失,因此,传统的MANET组播路由协议并不适合本文中的航空自组网络。为了满足本文中航空自组网络的组播功能,同时保证数据信息正确、高效的传输,我们需要设计适合其自身特点的组播路由协议。本文中骨干网组播路由协议是在ODMRP(On-demand Multicast Routing Protocol)协议的基础上进行改进的,因为ODMRP协议周期性的利用泛洪控制信息来建立转发网格和刷新路由,所以开销会比较大。骨干网组播路由协议的设计是从减少网络开销和充分利用骨干网自身特点两方面考虑的。其改进点主要有以下几方面:首先,新的协议是在组播源节点获得整个网络的链路持续时间时,选择一部分链路断开时再泛洪控制信息;其次,当有链路断开时,下游节点利用已知的单播路由来进行组播路由的维护,最后,新的协议还增加了节点的主动加入和退出过程,从而避免了节点被动加入和退出时造成的时延。对于子网组播路由协议的设计,采用先泛洪后剪枝的方式,即在组播业务数据到达时先泛洪到组播目的节点,然后再由组播目的节点发送剪枝消息来建立子网组播路由,从而避免了数据没有到达时路由的频繁维护,同时在数据传输过程中因为剪枝的缘故也减少了数据信息的转发量。最后,本文利用OPNET仿真软件对航空自组网络组播路由协议进行了仿真,仿真结果表明,本文设计的航空自组网络组播路由协议可以很好的实现组播功能,并且具有较好的稳定性。
[Abstract]:In recent years, the mobile ad Hoc network (MANET(Mobile Ad Hoc Network) has been widely studied in the world, which is because MANET is not dependent on fixed infrastructure and has the characteristics of self-organization, wide coverage, strong survivability and so on. In order to satisfy the one-to-many communication, multicast routing technology becomes more and more important in the network. Therefore, the multicast routing protocol of the aviation ad hoc network is studied in this paper. It includes backbone network layer and subnet layer, in which backbone network topology is relatively stable, and link duration and unicast routing information can be obtained. Most of the traditional MANET multicast routing protocols do not satisfy the hierarchical characteristics of the network, and the protocol overhead is high, sometimes because of the frequent disconnection of the link lead to data loss, so, The traditional MANET multicast routing protocol is not suitable for the aviation ad hoc network in this paper. We need to design multicast routing protocol suitable for its own characteristics. In this paper, the multicast routing protocol of backbone network is improved on the basis of ODMRP(On-demand Multicast Routing protocol. Because ODMRP protocol periodically uses flood control information to establish forwarding grid and refresh routing, The design of multicast routing protocol in backbone network is considered from two aspects: reducing network overhead and making full use of the characteristics of backbone network itself. The main improvements are as follows: first of all, The new protocol is to select a part of the link to disconnect and then flood control information when the multicast source node obtains the link duration of the whole network. Secondly, when the link is broken, Downstream nodes use known unicast routing to maintain multicast routing. Finally, the new protocol also increases the active join and exit process of nodes. In order to avoid the delay caused by passive join and exit of nodes, for the design of multicast routing protocol in subnet, first flooding and then pruning is adopted, that is, flooding first to multicast destination node when multicast service data arrive, Then the multicast destination node sends the pruning message to establish the subnet multicast routing, which avoids the frequent maintenance of the routing when the data does not arrive. At the same time, in the process of data transmission because of pruning, it also reduces the amount of data forwarding. Finally, this paper uses OPNET simulation software to simulate the multicast routing protocol in the aviation ad hoc network, and the simulation results show that, The multicast routing protocol designed in this paper can achieve multicast function well and has good stability.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：V243;TN915.04

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