Research On Resource Optimizing Mechanism For Distributed Mobility Management Architecture

The rapid development of mobile Internet technology and multimedia services lead to a significant increasing in the number of users. The content providers tend to push the content server to the edge of network in order to decrease the transmission delay and get better user experience. Nowadays, the mobile network presents a centralized architecture, which will encounter various problems along with the increasing of users and traffic such as non-optimized routing, single point failure, and low scalability. Moreover, a growing number of services have been migrated from the desktop to the mobile platform. The security problem of mobile transmission becomes exposed since more interceptions and phishings appear. Therefore, both academia and industry try to apply distributed mobility management with corresponding security mechanism to cope with the challenge of network development.Distributed mobility management scheme has become one of the popular issues in recent years. The resource optimizing mechanism under distributed mobility management architecture is also focused by academia, industry and the organization for standardization. There has been several solutions and schemes which was focusing on the deployment and resource optimization. But with the continuous development and evolution of mobile Internet, more expected scenarios need to be explored and researched. This paper mainly investigates the resource optimization of gateway, content, address, routing and secure transmission under the distributed mobility management architecture. The contributions made in this paper includes:1. According to the marginalizing deployment of content mirror in CDN, a migrating routing optimization method is proposed for multi-mirrors scenario. Combining with the character of distributed mobility management, a NAT equipment is deployed in the export of CDN mirrors as middle-ware. Virtual IP is introduced to separate the ID and Locator of mirrors. The mobile node can always pull data from the nearest mirror in topology during roam which solves the problem of "deadlock". By adding two extra states, Mig_Sent and Mig_Rcvd in TCP state machine, a novel transport layer mobility scheme named Mig_TCP is presented to cooperate with migrating optimization. The Mig_TCP uses "migrating three-way handshakes" to initialize the session between different mirrors which owns same content in order to support the TCP migration in transport layer. Mig_TCP is an incremental improvement, which is compatible with current TCP. It lays the groundwork for the mobility of transport layer protocol in future.2. Considering the complex of protocol and the high cost of signaling in migrating optimization, the mobility support should be selective and dynamic in order to reduce the network resource waste for unnecessary application and mobile node. An optional gateway resource optimizating method is proposed. According to protocol options, the perception of service is introduced to the network layer. It will make the session anchoring and routing optimization selective and dynamic. This method not only reduce the unnecessary cost for no-need supporting but also provide fine-grained mobility supporting for different requirments. The introduction of new option is also conform the planning and requirements of distributed mobility management in IETF.3. After analyzing the requirement and limitation of current IPv6NAT technology, a partial-state asymmetric NAT method, or PANAT, is proposed. PANAT fully exploits the IPv6huge address space to implement the IPv6to IPv6NAT function between two IPv6addresses with the prefix in arbitrary lengths. This method also keep the checksum-neutral and save the memory space during translation. PANAT liberates the limitation of IPv6address in local network and optimizes the utilization of IPv6address resourse in the gateway. This method not only support the NAT function for migrating optimization, but also provide a basic thinking for exploiting IPv6address huge space.4. By analyzing the requirement and limitation of current secure transmission, a Network-based hopping communication mechanism, namely NetHop, is proposed in this paper. The address hopping function is deployed on the network side instead of endpoint, which can support secure hopping communication function for universal endpoints without any restriction of Operating System or hardware. By using PANAT, NetHop fully exploits the superiority of IPv6huge address space. The hopping addresses are generated by hash function and the hopping addresses pair can be chosen randomly without synchronization. Consequently, it performs better on randomness and concealment than channel-rule NAH. NetHop re-deploys the security resource in the network and optimizes the scure function in the gateway.In conclusion, this thesis investigates the resource optimization scheme of gateway, content, address and security under distributed mobility management architecture and proposes a series of solution for various scenarios. The research presented in this thesis sets a good example for developing related theory.