Power Efficient Transmission of Time Multiplexed Unicast and Broadcast Cellular Communications

In this paper, a new power adjustment technique for the time multiplexing of LTE unicast and broadcast is proposed to reduce the wasted downlink power in unicast slots. In addition to compensating the propagation losses (distance-loss, shadowing and fast fading), the proposed technique adapts the signal-tointerference- plus-noise ratio (SINR) to be fit in the required range. The power adjustment algorithm uses a predefined SINR threshold (SINR_th) specific for each service and data rate. When the measured SINR of the user equipment SINR_UE is above (lower) than the SINR_th, the decrease (increase) of power is ordered adaptively depending on the difference between the two values. The proposed technique is evaluated by simulation where numerical results quantitatively outline the benefits on system performance, achieved in terms of average downlink transmitted power, average saved energy and outage probability of SINR_UE versus user speed.