Energy Modeling and Evaluation of NB-IoT with PSM and eDRX

Abstract

Large-scale deployment and management of Internet of Things (IoT) devices will become a critical issue in the near future. The 3rd Generation Partnership Project (3GPP) has proposed NarrowBand - Internet of Things (NB-IoT) as a new radio technology standard to enable Internet connectivity for a massive number of low-throughput devices. It supports better coverage and lower energy consumption than traditional Long-Term Evolution (LTE). The NB-IoT specification adopts the Power Saving Mode (PSM) and Extended Discontinuous Reception (eDRX) mechanisms to achieve a long battery life. In this paper, we present an energy consumption model for NB-IoT devices using PSM and eDRX, with a Poisson arrival process for uplink and downlink data transmissions. The model is compared to NS-3 simulation results. We analyze NB-IoT energy consumption for different PSM timers, eDRX timers and packet Inter-Arrival Times (IATs) based on the proposed model. Additionally, we have simulated the battery life for an NB-IoT use case on tracking shared bicycles. Comparison of the analytical model and simulation results shows consistency in the results with an average error of 11.82%. Our results also showed that with a 5 Wh battery, a device lifetime of more than 12 years can be achieved when transmitting at most one packet per day, and when properly confiauring the PSM and eDRX timers.

Publication
IEEE Globecom Workshop on Green and Sustainable 5G Wireless Networks