Research On Mobility Strategy In Content-Centric Networking

Currently, the traditional TCP/IP network architecture is gradually difficult to adapt to huge content distribution traffic of Internet. In addition, network scalability, dynamic continuity, controllability and operating cost are also serious problems in today’s network. To solve network problems, a number of countries have launched project aiming on designing future network architectures. Among which, the idea of Information-Centric Networking (ICN) has risen up as the dominating one. This paper focuses on Content-Centric Networking (CCN), which is the one of the typical prototype of ICN. CCN redesigns the network routing, caching, security, mobility, and scalability to be content-centric and enhances the performance of the network.Meanwhile, with the rapid development of wireless access technology and the popularity of mobile devices, the proportion of mobile data traffic in overall network traffic is rapidly increasing. The mobility support must be taken into consideration of future network architecture design. This paper classifies the device mobility problems as content requester and content source. Although the feature that CCN’s routing decisions does not depend on the host address mitigates the problems of content requester, however, the high handoff delay and traffic redundancy still cost. Moreover, the mobility of content source is not supported yet.This paper describes some current mobility works in CCN and points out its cons and pros. Then, the mobility problems are analyzed in detail and the design rules for mobility problems are summarized. To solve the mobility problems, this paper proposes an active push strategy based on "sender-driven" communication mechanism to reduce the handoff delay, redundant traffic and caching waste of content requester, and proposes a small-scale routing update strategy to guarantee the QoE, reduce the control overhead and protect the scalability when content source handoff.Finally, we build a simulation platform based on CCNx and implement the proposed content requester mobility strategy. The simulation is performed in lab environment using dual wireless cards handoff scheme. The content source mobility strategy is implemented in ndnSIM network simulator. The simulation is performed in topology with different scale. By contrasting the simulation results with that of current mobility works, the efficiency of the proposed strategy is verified.