Due to its power spectral density and retransmission technology

NB-IoT can achieve 20 d B coverage enhancement over GSM systems. However

the weak terminal chip capabilities

single-antenna configuration

and narrow bandwidth settings result in poor anti-interference capability. This article mainly describes the evaluation and optimization methods of NB-IoT network coverage performance. For the weak coverage and overlapping coverage found on the existing network

power optimization

inter-frequency networking

and interference avoidance solutions are provided.