Research Of Topology Control And Data Dissemination In Aanet

Aeronautical ad hoc networks is one type of mobile ad hoc networks which is applied in the field of aviation. Along with the rapid development of aviation industry and the diversity of future air traffic information, increasing data need to distributed through aeronautical ad hoc networks. Therefore optimizing network topology to improve network performance and achieving efficient data dissemination are important problems to aeronautical ad hoc networks. As a special MANET, aeronautical ad hoc networks possess some features, such as node status equality and no central control node as same as the features of MANET. However, the traditional ad hoc network topology control and data dissemination technology are no longer suitable due to its unique features, such as high dynamic, large-scale and limited bandwidth. Thus, it is necessary to do further research on aeronautical ad hoc network topology control and data dissemination technology.On the basis of link expiration time, topology control algorithm based on the number of neighboring nodes is studied. Then considering network congestion and node mobility, mobility and load aware geographic routing protocol is proposed. After that, based on local topology changes, an adaptive beacon exchange algorithm is designed. Finally we combine beacon exchange algorithm with mobility and load aware geographic routing protocol to complete data dissemination. The main contribution of this thesis lie in the following aspects:1) A topology control algorithm based on link expiration time is proposed. We take a control of network topology based on local information of neighboring nodes and measure the algorithm performance while choosing different number of neighbors. Through the simulation experiments, we find out that the network performance will do very well when the number of neighboring nodes keeps to a certain value, but once more than this value, the network will have a drop in performance.2) Setting up selection mechanism based on queue length and movement direction. Utilizing the selection mechanism, mobility and load aware geographic routing protocol is proposed. Simulation results show that the proposed routing algorithm is capable of reducing both end-to-end delay and the chance of failed delivery, enhancing the reliability of data transmission.3) Considering the fact that fixed beacon interval brings inaccuracy neighbor information problem and it doesn't support self-adaptive adjustable with overhead. In order to solve these problems, an adaptive beacon exchange algorithm is proposed. Then we combine beacon exchange algorithm with mobility and load aware geographic routing protocol to complete the data distribution. Experimental results show that the beacon exchange algorithm can adaptive adjust beacon interval to ensure the accuracy of neighbor information and adaptive adjustment control overhead.