An improved method for on-demand system information broadcast in 5G networks

We argue for a new method that applies to on-demand system information (SI) broadcast transmissions. The proposed method is targeted for 5G networks, and is based upon utilizing a cut-off value for the modulation and coding scheme used for broadcasting. Two variants of the proposed scheme are presented, namely the reactive and proactive method, depending on whether the user equipment requests an additional (re)-transmission of the SI message before or after the reception of the first transmission. The main advantage of this approach is an increase of the resource usage efficiency, which is evaluated through closed-form expressions. The mathematical analysis is complemented by an extensive set of numerical results, which are corroborated via simulations.