【作者】 蒋正义；

【导师】 朱善安；

【作者基本信息】 浙江大学 ， 控制理论与控制工程， 2005， 硕士

【摘要】 Ad Hoc网络是一种自组织、自组态、无中心的可以立刻投入应用的无固定设施网络。正因为这些特点,Ad Hoc可以广泛的应用于军事领域、传感器网络、紧急和临时场合、个人网络等。对Ad Hoc网络的研究在世界范围内方兴未艾,也取得了不少的研究成果。但是由于Ad Hoc的特殊性,这些成果也只是适合于某个或某些场合。还没有一套适用于所有场合的解决方案。本论文在讨论了Ad Hoc的特性后,介绍了一种基于多信道的小型Ad Hoc无线网络的设计与实现。节点的硬件使用TI公司的MSP430F149作为MCU,使用Nordic公司的nRF905作为射频芯片。数据链路层使用基于多信道的介质访问协议,即一个控制频道,多个通讯频道,采用RTS/CTS/BROAD/DATA/ACK的机制,通讯双方首先在控制频道上握手,然后在通讯频道上进行数据通信,有效地避免了内部冲突。网络层采用鱼眼状态路由。网络被分为不同的鱼眼层次以减少路由更新信息。根据到目标节点距离的不同,节点与邻居之间以不同的频率交换链路状态信息。节点借助链路信息构建整个网络的拓扑图,并计算最佳路由。最后,文章还讨论了这个系统在未来发展中可以做的改进。更多还原

【Abstract】 Ad Hoc wireless networks are self-organizing, self-configuring and instantly deployable in response to application needs without a fixed infrastructure. Because of these characters, Ad Hoc network can be widely used in military, sensor network, emergency and personal area network. Researches on Ad Hoc network have been widely developed in all over the world and a lot of results have been achieved. But because of the particularity of Ad Hoc, there is still no one solution that can be suit for all the situations. These achievements can only be useful in one particular scene or some scenes. After discussed about the special characters about the Ad Hoc network, this paper introduced the method to design and realize a small Ad Hoc network based on multi-channels. Each node of the network uses MSP430F149 of TI as the MCU and nRF905 of Nordic as RF IC. In data link layer, a MAC protocol based on multi channels is used. That is, there are one control channel and several communication channels. A mechanism called CTS/RTS/BROAD/DATA/ACK is used. During communication, the two nodes should first shake hands in the control channel, then transfer the data in a chose communication channel. Collisions inside the system can be avoided effectively in this way. In net layer, the fisheye state routing is used. The network is divided into multi-level fisheye scope to reduce routing update information. Nodes exchange link state entries with their neighbors with a frequency which depends on the distance to destination. From link state entries, nodes construct the topology map of the entire network and compute optimal routes. And in the last of the paper, the future developments of the system are discussed.更多还原