What are the differences and relationships between LTE-M and NB-IoT?
LTE-M, or LTE-Machine-to-Machine, is an LTE evolution-based IoT technology, called Low-Cost MTC in R12 and LTE enhanced MTC (eMTC) in R13, designed to meet the needs of IoT devices based on existing LTE carriers.
Built on cellular networks, NB-IoT consumes only about 180 kHz of bandwidth and can be deployed directly on GSM, UMTS, or LTE networks to reduce deployment costs and enable smooth upgrades.
In general terms, IoT technologies are divided into two broad categories: WLAN IoT (short-range) and cellular IoT (long-range).
WLAN IoT: represented by Wi-Fi, Bluetooth, Zigbee, Z-wave.
Cellular IoT: represented by NB-IoT, eMTC, LoRa, Sigfox.