Research On Key Technologies Of Mobility Management In Universal Identifier Networks

In the traditional Transmission Control Protocol/Internet Protocol (TCP/IP) stack, an IP address represents not only the identity of a host but also its topological location. When a node moves into a new subnet, the IP address as an identifier of a node is required to maintain invariable, in order to keep connection alive. Whereas, the IP address as a locator of a node should be aggregative in the new topology and the node has to configure a new IP address, in order to reduce the routing table entries and address the routing scalability issues. With the rapid development of Internet and the increasing number of users, the dual semantics of the IP address causes many serious problems including routing scalability and host mobility.Researchers propose the Identifier/Locator separation solution. which can reduce routing entries and keep connection survivability. Universal Identifier Networks is an Identifier/Locator separation networks, and this dissertation studies the mobility management schemes of Universal Identifier Networks. The main research innovations are as follows:1. In the current mobility solution of Universal Identifier Networks, the mapping update overhead and the handover delay are large. To address these issues, this dissertation proposes a hierarchical mobility management scheme based on the identifier/locator separation (MMILS). MMILS distinguishes intra-domain mo-bility and inter-domain mobility by introducing an Mobility Agent Switching Router (MASR). For intra-domain mobility, the MASR keeps the Mobile Node’s (MN’s) identifier-to-locator mapping invariable, so it avoids sending the mapping update to the mapping system and the Switching Route (SR) of each correspon-dent node (CN). For inter-domain mobility, this dissertation designs a united mapping table in the MASR to support fast update and handover. By estab-lishing an analytical model and implementing it in our test-bed, this dissertation analyzes the efficiency of MMILS. The results demonstrate that the signaling cost and the handover delay of MMILS are low. and the united mapping table is feasible.2. To reduce the mapping update cost and the packet blocking probability, this dissertation proposes a Mapping Forwarding (MF) scheme for location manage-ment in the identifier/locator separation architecture. The MF scheme sets up a MF chain to keep the MN’s identifier-to-locator mapping invariable. As long as the MN moves under the same MF chain, the MN’s mapping in the SR of each CN does not need to be updated, thus reducing the location update signaling cost. Meanwhile, the unchanged mapping assures the correct forwarding of pack-ets, which reduces mobility-related disruption. To evaluate the MF scheme, this dissertation establishes two analytical models to formulate the mobility-related blocking probability and the total protocol cost. The performance results show the MF scheme can effectively reduce the blocking probability compared with the location management scheme without the MF strategy. Meanwhile, our analysis demonstrates that the MF scheme has a low overhead when the mobility rate is high.3. To reduce the location update signalling cost and save the power consumption of MNs, this dissertation proposes paging extensions scheme for Universal Identifier Networks. It is unnecessary for the paging signalling to transmit in the wireless links and CNs can acquire the MN’s location information, so the scheme can save wireless resources. By developing an analytic model, this dissertation formulates the signalling cost and analyzes the influence of different factors on the signalling cost. The analytical results show that when the paging area is less than a certain value, paging scheme could reduce the total signalling cost and enhance the network performance.4. Centralized mobility management schemes face scalability issues due to a sin-gle mobility agent of failures and the creation of network bottlenecks. To ad-dress these issues, this dissertation proposes a Distributed Mobility Manage-ment scheme in Identifier/Locator Separation networks (DMMILS). The Map-ping Server stores global mappings between identifier prefixes and Autonomous Systems Numbers (ASNs), and the SRs in each AS constitute one-hop DHT (Distributed Hash Table) ring. The redundant storage mechanism and the char-acteristics of the DHT structure can enhance the system survivability. To evalu-ate the reliability and the efficiency of DMMLIS. this dissertation develops two analytical models to formulate the service blocking probability, the system re-sponse time and the total protocol cost. Meanwhile, this dissertation analyzes the influence of system parameters on DMMILS and compares the performance with Mobile IPv6and GHAHA (Global Home Agent to Home Agent).