A Prefetch Scheme Based on DTN Ferry for Countryside MultiMedia Education Platform

Chinese broadband network is developing rapidly but still far from all coverage for countryside areas, the island of information. Current distance education content is of large multi-media with large bandwidth. So it is critical for education platform to deliver the massive content timely and effectively, yet low-cost, even to the terminals without broadband coverage. Analyzed current mobile Internet access schemes, a pre-fetch scheme based on DTN ferry is proposed, which makes public transport as a ferry for transferring huge content from one place to another. Characteristics of the scheme are described, and its effectiveness is analyzed. In order to decide real-time estimation of prefetch access routing start and finish time, the access router running matrix on quasi-2D, 2D, quasi-3D is designed based on predictable condition. In the end, simulation results prove that countryside with an inexpensive WiFi network, connecting one another internal, can take advantage of DTN technology.