Car Ad Hoc Routing Technology

After 1990s, a totally new network technology Ad hoc was showed up in wireless communication area. Ad hoc is developing so soon that we can see it in lots of applications in communication areas including both military communication and civil communication. The vehicular application is one of the most typical examples of Ad hoc in civil communication. By far, America and Europe have already started up the related research project in this area.Routing Strategy is one of the key parts in Ad hoc technology. It is also one of the most promising and challenging research topics in Ad hoc. Based on this, we choose vehicular Ad hoc routing strategy as the research topic in this article.This article presents the background of the research topic at first, meanwhile introducing the developing status and the future of this area. Then based on the fundamental knowledge related to Ad hoc, it introduces and analyses existing Ad hoc routing protocols. This article also takes the German "Fleet Net" project as an example to depict the developing status of German vehicular Ad hoc research.Based on the knowledge above, this article focuses on two key parts of position-based routing protocol—routing strategy and location service. It advances a new robust and efficient vehicular Ad hoc routing strategy for city scenario. With the help of NS2 which is a network simulation tool, we do some performance analysis on this new routing protocol. Finally, it uses NS2 to compare with the performance of the location services from two different aspects—success rate of request and MAC load.Finally, the research shows that the new routing strategy is superior to the predecessor and the different location services have their own advantage.