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We propose a new caching concept in which wireless nodes in Device-to-Device(D2D) network can cache the initial-segments of the popular video files and mayshare to users in their proximity upon request. We term this approach asBootstrapping- D2D (B-D2D) system. Our findings suggest that caching onlyinitial-segments creates a large pool of popular files, thus improving theprobability of availability of initial-segments within the vicinity of therequesting users. Our proposed B-D2D system is based on a popular clusteringalgorithm called density-based spatial clustering of applications with noise(DBSCAN), that groups the users into dense and arbitrary shape clusters basedon two predefined thresholds. We then formulate an optimization problem tomaximize the probability of availability of initial-segments within thetransmission range of requesting wireless devices. The simulation resultsdemonstrate that, caching the initial video segments could substantiallyimprove the availability of segments within the proximity of users withoutrequiring any extra hardware infrastructure cost, and D2D services could beutilized to deliver the video contents with lower startup delays in cellularnetworks.

Evaluation of Availability of Initial-segments of Video Files in Device-to-Device (D2D) Network