2012/08/06 by Negin Golrezaei, Alexandros G. Dimakis, Golrezaei, Negin +3
Computer Science · #Caching and Content Delivery #Cooperative Communication and Network Coding #FOS: Computer and information sciences #Information Theory (cs.IT) #Networking and Internet Architecture (cs.NI) #Opportunistic and Delay-Tolerant Networks
paper · pdf · doi:10.48550/arxiv.1208.1290
openalex publication_date 2012/08/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We analyze a novel architecture for caching popular video content to enable\nwireless device-to-device collaboration. We focus on the asymptotic scaling\ncharacteristics and show how they depends on video content popularity\nstatistics. We identify a fundamental conflict between collaboration distance\nand interference and show how to optimize the transmission power to maximize\nfrequency reuse. Our main result is a closed form expression of the optimal\ncollaboration distance as a function of the model parameters. Under the common\nassumption of a Zipf distribution for content reuse, we show that if the Zipf\nexponent is greater than 1, it is possible to have a number of D2D\ninterference-free collaboration pairs that scales linearly in the number of\nnodes. If the Zipf exponent is smaller than 1, we identify the best possible\nscaling in the number of D2D collaborating links. Surprisingly, a very simple\ndistributed caching policy achieves the optimal scaling behavior and therefore\nthere is no need to centrally coordinate what each node is caching.\n