Energy and Bandwidth Efficient Content Retrieval for Content Centric Networks in DTN Environment

Communication infrastructures under the influence of the disaster strike e.g., earthquake, will be partitioned due to the damage of components such as base stations. The communication model of the Internet bases on a location-oriented ID, i.e., IP address, and depends on the DNS (Domain Name System) for name resolution. Therefore such damage remarkably deprives the reachability to the information. To achieve robustness of information retrieval in disaster situation, we try to apply CCN (Content-Centric Networking) to fragmented networks. Since CCN does not require name resolution, it can work without the global system such as DNS. However, existing retransmission control in CCN is not suitable for the fragmented networks with intermittent links due to the timer-based end-to-end scheme. Though the requirement to save energy and bandwidth are critical in disaster case, overhead caused by redundant retransmissions might waste bandwidth and energy. Accordingly, we propose the energy efficient retransmission scheme with the dynamic routing protocol suitable for fragmented networks. With the proposed method, messages are forwarded hop-by-hop with recognizing whether the state of links is connected or not. Simulation results reveal that the proposed method can reduce traffic load, energy consumption and delay of contents retrieval.