NB-IoT Deployment Options
Home LTE NB-IoT 5G(NR-NSA) Deployment Options The channel bandwidth of NB-IoT is 180 kHz which is equal to one LTE Physical Resource Block (PRB). Three deployment options are available: Standalone (reusing unused 200 kHz GSM carriers) Guard-band (exploiting the guard band between two adjacent LTE carriers) In-band (where one LTE PRB is reserved for NB-IoT within an LTE carrier bigger than 1.4 MHz.) In order that they can coexist together, NB-IoT numerology is inherited from LTE. In both uplink and downlink, the channel divided into 12 subcarriers (of 15 kHz each). The time domain is divided into time slots, each lasting 0.5ms and consisting of 7 OFDM/SC-FDMA symbols. The smallest time-frequency resource, namely Resource Element (RE), is composed of one subcarrier and one symbol. Time slots are grouped as follows: two time slots form one subframe (1ms), 10 subframes form one frame (10ms). Frames