Research on Energy Saving Mechanism of NB-IoT Based on eDRX

3GPP's standardization of the Narrowband Internet of Things (NB-IoT) paved the way to support the use of low-power wide area (LPWA) in cellular networks. The design goal of NB-IoT is to expand coverage, low-power and low-cost devices, and large-scale connections. As a new wireless access technology, this paper establishes a Markov model with the working state of the terminal device as the state variable for the extended discontinuous acceptance (eDRX) mechanism adopted by NB-IoT, and calculates the corresponding power consumption and Time delay model. Given that the previous calculations of power consumption and delay did not consider the impact of random access. in this article, We propose a Markov chain with random access process. The numerical results show that the backoff time of each access failure of the terminal device during the process of accessing the network has a greater impact on the power consumption and delay.