On the Adaptive AoI-aware Buffer-aided Transmission Scheme for NOMA Networks

In this paper, non-orthogonal multiple access (NOMA) technology was exploited in a downlink wireless network to improve the averaged age of information (AoI) performance, where a source deployed with data buffers is supposed to send independent information to two users. A long-term average AoI minimization problem is formulated by taking into account of data and energy causality, peak and long-term average power constraints. Then, to fully explore the potential of data buffers, we used Lyapunov optimization framework and proposed a novel adaptive AoI-aware butter-aided transmission scheme (ABTS) to adjust the transmission rate and transmit power according to dynamic channel state information (CSI) and butter state information (BSI). Simulation results were presented to validate that the proposed ABTS scheme performs much better than those schemes with OMA transmission in terms of reducing AoI.