On Aggregative Mobile Network Model

The mobile arena has been experiencing exponential growth in the past decade. With the world's evolution and progresses in technologies like communication, computer, and micromechanics, people have seen great advances in network infrastructures, growing availability of mobile applications, and the emergence of mobile devices such as portable or handheld computers, PDAs, and cell phones, all getting more powerful in their capabilities. These devices are now playing an ever-increasingly important role in our lives. Meanwhile, new issues rise with the expanding requirements of mobile users and some new immature theories, which drive researchers to continue working on these new challenges.Among all researches in mobile communication networks, the network architecture and mobility management are two keys. Taking account of inherent multitudinous behavior of human beings, this dissertation proposes an Aggregative Network Model in next-generation mobile networks. The model is based on hybrid architecture and supposed to improve the network capacities and management efficiencies. In this wise, a framework of this model is first presented in this research and follows analysis of the model effectiveness in capacity and energy consumption. Thirdly this thesis investi-gates the nodes'density in individual RWP mobility model and proposes a novel random group mobility model. And finally an autonomic management scheme for the model and the application of the model in location management are discussed in the work.The main contributions of the thesis are listed as follow:With the tendency of multi-radio accesses in the next-generation mobile system and the emergence of multi-radio devices, a framework of the aggregative network model is presented based on the prototype of multi-radio hybrid networks. The network to-pology, protocol hierarchy and functionality entities are issued in this framework. Mobility management module and hybrid fashion of vertical and horizontal commu-nications are especially considered in this part. And an demonstration of the entities'working mechanisms and communication modes is given to show the workflow of the model.As a result of using multi-hop transmission, the energy consumption of the aggre-gative network model is greatly reduced compared to the traditional single hop cellular access network. Considering that the proposed model can further using data fusion and multi-radio techniques, it can be asserted that the architecture of an aggregative network model can help to improve the network performances. Founded on network capacity regions theory, in the second part, the effectiveness in network capacity by the architecture of the model is proved despite of not using data compression and multi-radio techniques, which is mainly caused by the utility of the multi-hop transmission and spatial reuse.Using PALM calculus, the nodes'density in individual RWP mobility model is in-vestigated. It is proved that there exists inherent gathering phenomenon of numerous nodes moving with RWP mobility model and the closed forms of the mobile's density distribution in 1-D and 2-D areas are resolved with verification of simulation respec-tively.Further on mobility model, a novel random group mobility model for mobile net-works named Charge Vector Group Mobility Model that regards mobile nodes as particles carrying different kinds of charges is brought forward. Reference points are also defined carrying only one kind of charge and moving in simulation area in some general rule. Mobile nodes then move according to the force field of the charged ref-erence point in manner of free moving, attracted moving and following.To promote the aggregative network model to application, a set of autonomic management procedures and algorithms are raised to guarantee proper operations of a group. Leader selection and rotation algorithms are also exploited based on variables called aggregative degree and prestige to make it fair and long life. Simulation illus-trates the relations between several factors and the management cost, and shows with the leader rotation algorithm, fairness can be also achieved.In the last part of the thesis, a group location management scheme is put forward. A leader mobile terminal is elected out of all group members to perform the location update and administration tasks for the whole group. Results of numeric simulation show that not only the signaling cost but also the whole database access consumption of location update is saved for the efficiency of group operation.The entire works of this thesis are exploring forefront in constructing ubiquitous networking with distributed control. Proposals and results are expected to expedite the foundation of networking theory, progresses in mobility management and the application of the next-generation mobile networks.