A Mode Shifting Resource Allocation Scheme for Device-to-Device Underlaying Cellular Network

Device-to-Device (D2D) communication underlaying a cellular network is a promising technique, and it has recently been proposed for booming local services, which will greatly improve system capacity by sharing the same resource blocks of cellular users at the same time. However, the mutual interference brought by inappropriate resource reuse will deteriorate the performance of the whole system. In this paper, a mode shifting resource allocation scheme is presented without channel state information (CSI) of D2D link and D2D user to cellular user link. D2D pair traditionally shares resource block of cellular user with the best channel to reduce the relative interference to cellular link. While in the other way, for the same purpose, the D2D user can also reuse the resource block over which its transmitter has the worst channel between itself and base station (BS), in addition a simple strategy is put up to select the reusing mode that provides larger capacity. Numerical results show that our proposed scheme performs significantly better than reference scheme in terms of system capacity and outage probability of cellular link, besides the scheme will not cause any extra complexity.