Research On TDMA-based Clustered Protocil With Directionalantenna In Ad Hoc Network

With the rapid development of mobile communication technology and wireless network technology,some new problems and demand arise in Ad hoc network : the larger and larger scale of Ad hoc network make it difficult to manage the network efficiently;because of the variety of service(text,photograph,audio,video and so on)in Ad hoc network,every node in Ad hoc network must use the bandwidth dynamically;the huge scale of network and the variety of service make it very high requirements in network capacity and network security.With the rapid development of directional antenna,the advantage of directional antenna has been used in Ad hoc network to solve the new arising problems along with TDMA mechanism and network clustering technology.This research is mainly applied to the backbone network of low speed aircrafts in near space.On this application,the network nodes distribute as clusters,nodes has lower movability and the distance between the node and the next node is quite far. The range of the network traffic rate supported by this backbone network is quite wide.The network has QoS requirements,especially,packet delay must be short enough to meet the real-time request.This paper has use the methods of theoretical analysis and network simulation and has propose a TDMA-based double-antenna clustered routing protocol,which combine TDMA channel access mechanism,network clustering technology and the benefit of directional antenna in Ad hoc network.First, this paper has proposed a TDMA-based clustered MAC protocol,named C-FPRP protocol. And it give the design about the C-FPRP protocol and the simulation results and the analysis.Then,it proposes algorithms both in Omni-directional network and Directional network. Then,this research has analysis how the distribution of traffic slot influence the packet delay.The analysis result shows that the more depersive the traffic slots is, the shorter the packet delay is. The simulation has study the network building and reconstruction in detail.And next,this paper give deep research on the double-antenna clustered routing protocol.The node in this protocol use directional antenna and omni-directional antenna.Omni-directional antenna is used to build the network and to maitain clusterstructure,and the directional antenna is used to transmit high speed data.The simulation result show that this directional routing protocol has a observably improvement in lowing end-to-end delay and reducing average packet hot and increasing the spacial multiplex ratio of channel and increasing network capacity.