Research On Location Management And Multi-interface Cooperation In Mobile Internet

The rapid development of mobile communication technology and the Internet's widespread popularity greatly promoted the people's demand for mobile Internet. In recent years, networks, terminals and application technologies aspects have also experienced abundant and profound changes. Access network diversity and heterogeneity of the terminal are two major challenges which the mobile Internet is facing. The diversity of access network is reflected in network architecture, network interface protocol, mobility support capabilities and other aspects. Heterogeneity of terminal is reflected in transmission efficiency, multiple network access and other differences.With the new network architecture emerging in the mobile Internet, mobility management techniques face new challenges. The explosive growth of the number of mobile terminals has greatly increased pressure of mobility management. Location management is an important part of mobility management. The emergence of mobile network architectures and mobility management schemes, as examples, Mesh and PMIPv6, brings such new topics need to solved about performance, robustness, scalability and application flexibility of location management. With the continuing expansion of the network scale, the number of terminals with multiple interfaces is also rapid growth due to the potential capacity of transmission capacity, accessibility, security and other aspects. The standardized series of IPv6 protocols generally do not consider the terminal with multiple interfaces; as a result the requirements of new features of terminal can not meet. In order to eliminate the potential conflict of multiple interfaces and to achieve cooperation of multiple interfaces further, to provide higher availability, transmission efficiency and security, and to shield the operation complexity caused by multi-interface to the upper application, it urgently needs to be studied the algorithms and protocols about information and control flow integration between more than one interface of multi-interface terminal.In this dissertation, in the current mobile Internet the location management efficiency of the wireless mesh network and algorithms, and integration of transmission efficiency and addresses selection of multiple interfaces, have been studied and then the corresponding solutions have been proposed. The main contributions of the dissertation are as follows.1. The cost is analyzed theoretically using the traditional location management strategies in the WiMAX mesh network, and then are compared with that in the typical cellular networks. Furthermore, impacts of various location management performance-related factors are analyzed to identify the influencing ones which play a decisive role of efficiency of location management. The results showed that the traditional location management strategy in the WiMAX mesh network is inefficient.2. A Cluster-based location management scheme is proposed, in which the characteristics of mesh structure is taken fully into account. Utilizing the similarity of transmission path of adjacent cells, the location area is divided into a number of Clusters with similar size and high aggregation. As a result, the efficiency of location management in mesh networks increases through distributing signaling to all the cells in a Cluster using a quasi-multicast manner. Numerical analysis shows that this method significantly reduces the location management signaling cost.3. A method integrating transmission capacity of multi-interface mobile terminal in PMIPv6 field is proposed. Through expanding the binding relationship between home network prefix and mobile access gateway maintained in local mobility anchor, a number of interfaces in a mobile terminal attached to different mobile access gateway can simultaneously transmit data. Furthermore, by combination of physical bandwidth of the multiple interfaces of the terminal into bandwidth of a logical high channel, upper applications take an integration of advantage of several multiple access technologies. Also, the requirement of load balancing between multiple interfaces of a mobile terminal can be achieved using this method. Simulation results show that this method brings significant improvement of transmission performance and user experience enhancement.4. An IPv6 address selection method of multi-interface terminal is proposed. By increasing the global and accuracy metrics into policy tables, the selection principle of which is recommend, and using multi-criteria decision making method to integrate of several policy tables based on the metrics mentioned above, a multi-interface terminal can accordingly accomplish IPv6 source/destination address selection. The efficiency and intelligibility of the integration process can be ensured well.