Research On Key Technologies Of Mobility Management For New Internet Architecture

Internet, mobility and cloud computing have greatly changed people’s life style, enriched people’s life content, promoted people’s life quality. However, with the fast development of Internet service and technology enhancement, many problems and challenges come out accordingly, resulting from the limitations of the original design, and hinder their development further.This dissertation investigates the issues around Internet, mobility and cloud computing step by step. Firstly, it proposes a new Internet architecture to address the challenges faced by legacy Internet. Secondly, it studies the mapping and the location management problems under the proposed Internet architecture. Thirdly, it proposes a scheme to optimize the location update cost caused by frequent movement of mobile terminals. Lastly, it proposes a new scheme to support virtual machine migration across layer-3network. Specifically, the research contents of this paper are as follows.1. To address the problems and challenges faced by legacy Internet, a new Internet architecture based on ID/Locator separation and hierarchical structure is presented. Mobility can be potentially supported through the separated definition of identity property and location property. Based on the hierarchically logical organization and the structured definition of ID and locator, this architecture provides hierarchical addressing and routing, and the routing mechanism in the core network is based on the atonomous system ID instead of IP prefix, greatly reducing the scale of core routing tables. The networking technologies adopted by different layers of network or between different carriers can be decouply independent, which enables the competition of networking technologies and stimulates the development of various networking technologies. The source locator in the packet can be changed and mapped accordingly by the edge gateway to induct the traffic to a defined terminal going through a defined upper-layer carrier network, thus to support multi-homing and traffic engineering without increasing the number of core routing table entry. 2. To address the mapping and the location management problems under the proposed Internet architecture in1, a two-layer DHT and rendezvous mechanism based mapping and location management system is firstly proposed according to its hierarchically logical organization. The three layers of the mapping and location management system correspond to the three layers of the Internet architecture respectively, the edge rendezvous layer corresponding to the edge access layer, the layer-2DHT domain corresponding to the autonomous domain layer, and the layer-1DHT domain correponding to the core switching layer. The edge rendezvous mechanism is used to aggregate the mapping information of the edge access network, the layer-2DHT ring is used to distributedly store and query the mapping information for the autonomous domain network, and the layer-1DHT ring is used to distributedly store and query the mapping information for the whole Internet. The mapping information in the edge rendezvous can be dynamically updated to support the location update for mobile terminals. Secondly, a multi-layer pointer based cache mechanism under which the mappings are differentiatedly stored, is proposed to enhance the mapping resolution performance. This scheme overcomes the low mapping resolution performance without cache mechanism and also the expiration problem caused by mobility under direct cache mechanism. The evaluation results illustrate that this scheme can significantly enhance the mapping resolution performance.3. To address the frequent location update resulting from frequent movement for mobile treminals, a variable hierarchy based location management scheme is proposed to optimize the location update for mobile terminals. It implements multi-hierarchy location management servers in local mobile networks, inside of which the mobile host registration gets to a proper hierarchy according to its handoff frequency, to restrict the location updates into a limited area. The simulation results show that this mechanism can significantly reduce the load of home location management server for mobile host and the cost of location update, and greatly promote the success rate for mapping resolutions if the system parameters are properly adopted.4. To address the virtual machine migration across layer-3network, we introduce future Internet architecture techonologies and mobility management techonologies in wireless communication network into cloud computing system, and propose an ID/Locator separation based virtual machine migration scheme. The ID and locator of virtual machine are separatedly defined, and this decouples the upper layer services and the location information, making the locator change caused by virtual machine migration across layer-3network transparent to upper layer services. Location management technology is introduced to track virtual machine in the cloud computing system, performing location query and update. Compared to the other related schemes, this scheme has obvious advantages in that updating DNS is not needed and the virtual machine is decoupled from the source physical server after migration, which make this scheme valuable in deployment. We build a test-bed leveraging OpenFlow-enabled SDN technologies, and the experimental results prove the feasibility of the scheme with a low delay and packet loss rate, and also prove that it can support virtual machine migration between heterogeneous networks and arcoss layer-3network without upper layer service interruption.