The intensification of mobile broadband services and user experience is explicitly dependent on increased battery life of user equipment (UE) and minimized delay in service. In 5G New Radio (NR), in addition to Discontinuous Reception (DRX) scheme, Bandwidth Part (BWP) switching plays a significant role in reducing UE power consumption. The dynamic bandwidth operation in BWP switching is power efficient as UE can adapt its operating bandwidth based on the traffic arrival. In this work, BWP switching based DRX mechanism is modeled as an M X /G/1 queue to trade-off between quality of service (QoS) and power saving in UE in 5G NR. Analytical and numerical results on the proposed model show it to be promising in minimizing power consumption and reducing delay in service of UE.

Narrowband Internet of Things (NB‐IoT) embodies the vision of connecting virtually anything with everything and aims to support a massive number of devices for small data transmission. However, an efficient power‐saving model for battery‐operated NB‐IoT devices is the need of the hour. In addition to the legacy discontinuous reception (DRX) scheme, efficient beamforming helps in saving device power. Moreover, the extended discontinuous reception (eDRX) mode and Power Saving Mode (PSM) in Radio Resource Control (RRC) idle mode enhances the effect of sleep while no data is available for the device to serve. In this work, power‐saving techniques for NB‐IoT devices are studied via stochastic modeling. This work proposes a semi‐Markov model (SMM) for beam measurement and beamforming‐based DRX mechanism, in RRC modes. The steady‐state probabilities for the SMM are calculated using the two‐stage method. The numerical results show the effective contribution of efficient beamforming, eDRX state and PSM state in enhancing the power saving of NB‐IoT devices.