narrow band LTE (NB-LTE)
Narrow Band LTE( NB-LTE) is a variant of Long Term Evolution (LTE) for a cellular Internet of Things( CIoT). NB-LTE is optimized for narrowband transmission of small data packets and is suitable as a low power WAN( LPWAN) for extremely energy-efficient M2M communication. This is particularly important because it allows a long battery life to be achieved. This is said to be 10 years.
NB-LTE offers some improvements over LTE M2M( LTE-M). Like this, it operates in the sub- GHz range between 700 MHz and 900 MHz. The transmission bandwidth is only 200 kHz, compared to LTE-M's 1.4 MHz. The transmission rates of NB-LTE are 200 kbit/s in the downlink and 144 kbit/s in the uplink. The receive sensitivity is -164 dB, and the transmit and receive level budget is about 20 dB higher than that of LTE-M.
Various processes contribute to energy efficiency and to extending battery life. For example, the Power Saving Mode( PSM), in which a timer determines how long the terminal can be reached for mobile transmissions. The end device triggers the timer as soon as it goes into sleep mode. The terminal then switches to power saving mode. The terminal cannot be reached in this state. It remains in this state until it is requested to perform an action via a Mobile Originated( MO) command.