Research On Mobility Support Approaches In Information Centric Network

In recent years, studies on future Internet have become prominent in academia at home and abroad. With the advantages of high resource utilization, low energy consumption and good dynamic performance, Information Centric Network (ICN) has shown the greatest potential as a candidate future Internet architecture. However, as a newly proposed architecture, ICN still has several problems need to be solved in the near future, such as mobility, scalability and security. This thesis mainly focuses on the source mobility problem and the consumer mobility problem that exists in the current ICN, and proposes four mobility support approaches that apply to the scenarios with different mobility support demands.The main contributions and innovations of this thesis are summarized as following:1. To provide seamless source mobility support in ICN, this thesis proposes a Locator Based Mobility support Approach (LBMA). Firstly, LBMA appends an optional field to the ICN packet, and introduces a locator that is structurally similar to the content name, to improve the addressing efficiency of Interest packet, and maintain the routing scalability of ICN. Secondly, LBMA modifies the FIB (Forwarding Information Base) of the AR (Access Router), and adds an IS (Interest Store) that is structurally similar to the CS (Content Store), to reduce the handoff latency of the source, and prevent Interest packet losses resulted by the mobility of the source. Meanwhile, this thesis builts a source mobility model, which can be used to describe the movement behavior of the source. Besides, this thesis compares the handoff performance of the source mobility support approaches in ICN via analytical and simulation investigation. Results indicate that LBMA can provide lower handoff cost, shorter handoff latency and smaller content retrieval latency during the handoff process.2. To provide seamless intra-domain and inter-domain source mobility support in ICN, this thesis proposes a Proxy Based Mobility support Approach (PBMA). Firstly, PBMA extends the basic functionalities of ARs, such as tracking the mobility status of the source, and initiating the handoff related signaling instead of the source. This avoids the source from involving the mobility signaling exchanges, which further saves the limited wireless bandwidth resources and reduces the energy consumption of the source. Secondly, PBMA provides the principle of adding, updating and deleting SLT entry. This saves the limited storage space, and ensures the accuracy of the SLT (Source Location Table). Meanwhile, this thesis builts a fluid flow mobility model, which can be used to describe the intra-domain and inter-domain movement behavior of the source. Besides, this thesis first compares the handoff performance of the mobility support approaches in ICN and IP via analytical and simulation investigation. Results indicate that PBMA has lower location updating cost, shorter handoff latency and less packet losses. Moreover, this thesis first designs a network mobility support approach in ICN, which can enable mobile networks to move freely in ICN.3. To provide seamless consumer mobility support in ICN, this thesis proposes a proactive Caching based Mobility support Approach (CBMA). Firstly, CBMA extends the basic functionalities of ARs, such as pre-fetching and caching content items that the consumer does not receive but were requested before a handoff process. This reduces the handoff latency of the consumer, and prevent Data packet losses resulted by the mobility of the consumer. Secondly, CBMA provides a L2-based handoff decision strategy, which can help to decide when to trigger the handoff procedure, and decide which attachment point is the candidate one that the consumer should handoff to. Meanwhile, this thesis builts a random waypoint model, which can be used to describe the movement behavior of the consumer. Besides, this thesis first compares the handoff performance of the consumer mobility support approaches in ICN via analytical and simulation investigation. Results indicate that CBMA has lower content retrieval cost, higher handoff saving, shorter handoff latency and better content retrieval efficiency.4. To provide seamless mobility support for differentiated content in ICN, this thesis proposes a Differentiated Content Mobility support Approach (DCMA). To provide differentiated experience level for differentiated content, as well as resolve the source mobility problem and the consumer mobility problem simultaneously, this approach not only modifies the format of the original ICN packet, but also sets differentiated forwarding priority level and extends the basic functionalities of ARs. Besides, this thesis proposes two methods to assess the system capacity and the service blocking probability. Based on the actual data, this thesis further analyzes the impact of terminal identity, terminal behavior, terminal capacity, session arrival rate and terminal number on the system capacity and the service blocking probability. Moreover, this thesis designs a QoS support approach in ICN, which can enable ICN to provide differentiated level of service for differentiated content.