Video content for streaming or downloading has the special property of a concentrated popularity distribution, i.e., a small percentage of all videos account for the vast majority of data traffic through wireless networks. Yet traditional wireless networks treat videos like any other files, transmitting them through unicast links. Over the past years, we have proposed and analyzed a new method of video transmission that is based on caching video files on user devices, and then distributing them on demand via spectrally efficient device-to-device (D2D) communications over short distances, thus converting (cheap) memory on the devices into bandwidth. This talk will give an overview of the method, and describe some of our more recent work that concentrated on information-theoretic scaling laws, analysis of popularity distribution based on large sets of measured data, and the tradeoff of energy efficiency and battery lifetime with network throughput.
Andreas F. Molisch is the Solomon Golomb – Andrew and Erna Viterbi Chair Professor at the University of Southern California. He previously was at TU Vienna, AT&T (Bell) Labs, Lund University, and Mitsubishi Electric Research Labs. His research interest is wireless communications, with emphasis on wireless propagation channels, multi-antenna systems, ultrawideband signaling and localization, novel modulation methods, and caching for wireless content distribution. He is the author of four books, 19 book chapters, more than 240 journal papers, 320 conference papers, as well as 80 patents. He is a Fellow of the National Academy of Inventors, IEEE, AAAS, and IET, as well as Member of the Austrian Academy of Sciences and recipient of numerous awards.