Outage analysis for device-to-device communication assisted by two-way decode-and-forward relaying

In this paper, we investigate the outage probability of device-to-device (D2D) communication assisted by decode-and-forward (DF) relay node and that using traditional strategy. We assume all terminals are equipped with single-antenna. We first derive closed-form expressions for the outage probability of the D2D link under asymmetrical and symmetrical cases respectively. Then we derive tight approximations of the outage behavior in the high signal-to-noise (SNR) regime under the two cases. Based on these results, we then show that the D2D communication aided by DF relay node gains advantages over that of the traditional strategy without extra power. Numerical results demonstrate that the analytical results are accurate on various conditions.