Study On The Connectivity Of AANET

Aeronautical ad hoc networks(AANET) is an aeronautical communication networks that formed by planes, satellites, base stations and the communication links among them when planes flying.In AANET, high-speed planes are randomly distributed with communication links changing high-dynamically. When densities of planes and base stations are given, and the communication range of them is assumed set to a same value, the connectivity of two arbitrary nodes, which must meet communication requirements, is one of the fundamental issues of the networking feasibility of AANET.Most of the works on the connectivity of AANET are focus on the connectivity probability of planes in one-dimensional two-way airline and, for two-dimensional two-way airline AANET or multi-airline AANET, there are only several works and the research about connectivity duration distribution of two connected nodes in AANET is scarce. Thus, the existing research results are hard to be used to analyze AANET with complex topology. Combining the research of project “Networking and key technology research of transatlantic aviation broadband mobile communication” which is supported by national natural science foundation of china, and with the guiding ideology that aircraft try to access the internet or the backbone network through ground stations by using air-air links and ground-air links as far as possible, the author of this thesis studies the connectivity related theory of AANET according to the characteristics of high-speed movement of nodes, high dynamical network topology and large network space span in the civil aviation communication network. Especially, the author goes into: the analysis of connectivity of two-dimensional two-way airline scene; the relation among the connectivity of multi-airline AANET, the density of planes and their mobility; the relation of the density of base stations in different area and the connectivity of the whole networks. The detail of the study and main contributions of this thesis contain the following aspects.① Study on connectivity of two-dimensional two-way airline AANET. Coverage theory for one-dimensional scene are promoted and applied to the analysis of the followings: The connectivity probability of single hop between two adjacent planes and the duration distribution of their connection; The recurrence relation between the results for single hop and multiple hops. The relation of connectivity probability and connection duration distribution; The coverage distance distribution of multiple hops. Finally, the mathematical relation of plane density and the connectivity of two-dimensional two-way airline AANET is given, which is an important support to networking feasibility analysis in this scene of AANET.② Study on connectivity of multi-airline AANET. Combining the aviation regulations, this thesis gives a model of multi-airline AANET by dimensionality reduction and several works are done based on it: The computing method for important network parameters in arbitrary AANET, such as degree distribution of plane, clustering coefficient of the networks and so on; Analysis of the connectivity probability, the connection duration distribution and the average number of hops in a connection for two arbitrary nodes in an AANET. Finally, the mathematical relation of plane density and the connectivity of multi-airline AANET is given, which is important to networking feasibility analysis of multi-airline AANET.③ Study on the relation of base station density and connectivity of AANET. Based on the multi-airline AANET model and clustering algorithm, this thesis clusters air space according to plane densities in the areas covered by base stations into several different class of areas. Finally, when the densities of planes in all the areas are given, the relation between the densities of base stations in different areas and the connectivity of the networks are worked out, which can be a significant reference basis for base stations deployment.All the achievements of the thesis are simulated on the built civil aviation communication simulation scenarios. The simulation results verify the theory relation between the connectivity of AANET and the density of planes or the density of base stations in different areas, and some key parameters that affect the connectivity of AANET are also analyzed, both of which can be taken as the theoretical reference basis for networking feasibility analysis of AANET.