1. Feature of NB-IoT and how differences are NB-IoT, compared to LoRa (Long Range) and LPWA (Low Power Wide Area)?2. Working mode of NB-IoT and co-existence with existing cellular networks such as GSM and LTE?3. Why and how can NB-IoT enhance coverage and low latency sensitivity?4. How is NB-IoT developed from MTC technology?