Content-centric networking (CCN) is designed for efficient dissemination of information. Several architectures are proposed for CCN recently, but mobility issues are not considered sufficiently. We classify traffic types of CCN into real-time and non real-time. We examine mobility problems for each type, and suggest the possible hand-off schemes over CCN. Then, we analyze the delay performance in terms of simulation study. We believe that the proposed schemes can be merged as a part of the CCN easily, since they comply with the inherent nature and rules of the CCN.

Content-centric networking (CCN) has been recently proposed as an alternative to traditional IP-based networking. In CCN, content is accessed by content name instead of a host identifier (locational identifier). This new type of access methodology rapidly and efficiently disseminates content in combination with the in-network caching mechanism. For practical use of CCN, many network properties studied in IP-based networking are being revisited, and new types of CCN architecture components are being designed. Although mobility is an essential aspect of the future networking system, it has not been sufficiently studied. We therefore address fundamental mobility issues, such as seamless handover, optimal access point selection, network mobility, and handling of persistent interests. In addition, for each issue, we propose practical solutions that efficiently align to a CCN environment. To ensure seamless handoff, we propose various handoff schemes and compare their performance in terms of handoff latency using packet-level simulation. Because our proposed schemes are consistent with the characteristics and rules of CCN, we believe that they can easily be integrated as a part of CCN. content copies are served for later access to the content until they are evicted from the cache either by a cache replacement policy or lifetime expiration.This new type of content access enhances mobility features as well [2]. In IP networks, content is delivered over a pre-established connection, which is identified by the IP addresses of the sender and the receiver. Therefore, whenever a mobile user moves to a different subnet, the connection is broken by the change in IP address. Although schemes to preserve the connection during handoff have been proposed, they incur too much overhead to be widely deployed [5]. In CCN, however, because an end-to-end connection does not exist, a mobile user can achieve a seamless handoff by simply continuing to access the content in a new location. Nevertheless, there are several issues to be further studied for more efficient network utilization.The first issue is handling the persistent interest during handoff. Basically, CCN routers erase the PIT entry after relaying the matched response. However, the authors in [6] insist that sending an interest for each content chunk is inefficient in a streaming service; instead, they suggest persistent interest. Rather than sending per chunk requests, the content recipient sends a persistent interest once at the beginning of the service. Intermediate routers maintain that persistent interest during the content lifetime and even after they successfully relay a single response. The persistent interest becomes a problem if a mobile user of a streaming service changes location. Because CCN routers cannot compensate for the mobility of the content recipient, the routers continue forwarding responses until the persistent interest expires, which results in wasted link bandwidth. The second issue concerns the selection of the most optimal access point (AP). Nowadays,...

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