Abstract: There is disclosed a process for communication between a wireless base station with L transmit antennas and a set of receiving nodes equipped with caches so that content from a set of files can be stored in these caches. By formulating a novel way of setting users in groups and storing content partially as function of this grouping, it is achieved to increase gains in terms of number of users served simultaneously compared to the state-of-art. The approach taken here makes use of the multiple transmit antennas to boost the number of multicasting users by up to L times compared to the state-of-art, thus reducing significantly the transmission time. The invention is also presented for i) wired communications, ii) multi-transmitter cooperative communications in both wireless or wired networks and iii) in a device-to-device setting where users desire to exchange files between one another.

Abstract: A process of communication between a transmitting base station (B) with L transmit antennas, and a set of receiving nodes N1, N2, . . . , NK in a wireless communication system, wherein nodes N1, N2, . . . , NK have storage capabilities, and wherein the said process involves the steps of:—grouping K users into groups, with a specified number of users per group;—identifying a set of files of interest F1, F2, . . . , FN, that may be requested by the receiving nodes;—arranging a first time slot (time slot 1) during which said base station (B) transmits a signal x1 corresponding to the downlink transmission with said receiving nodes, where said signal x1 maps information from F1, F2, . . . , FN, and where said signal x1 is received, processed and partially stored (cached) by said receiving nodes, where caching as at least a function of said grouping;—arranging a second time slot during which some or all receiving nodes Nk, (k=1,2, . . .