The following table shows recommended test cases for conducted Narrowband Internet of Things (NB-IoT) signaling mode.
| Mode | Test item | 3GPP test ID | Band/Channel | Temp/Voltage | Signaling parameters | Expected result | Note |
|---|---|---|---|---|---|---|---|
| NB-IoT TX | Maximum output power | 6.2.2F | ALL/LMH | TYP/EXT | 15 kHz, QPSK, 12 SC, Pmax (RMC) | 21 dBm | Pmax, 21 dBm±2 dB (QPSK, 12 SC) |
| Frequency error | 6.5.1F | ALL/MID | TYP/TYP | <±0.1 ppm | Pmax | ||
| NPUSCH EVM (RMS) | 6.5.2F.1 | ALL/LMH | TYP/EXT | <6% | Pmax, 3GPP limit <17.5% | ||
| Adjacent channel leakage power ratio | 6.6.2F.3 | >33 dB | Pmax, E-UTRA ACLR±1 | ||||
| Spurious emissions (9kHz to 12.75GHz) | 6.6.3.1F.1 | ALL/MID | TYP/TYP | <-33 dBm/1 MHz | Pmax, harmonics, spurious, noise | ||
| NB-IoT RX | Reference sensitivity level | 7.3.1F | ALL/ALL | <-112 dBm | For faster measurement, channel raster Low Mid High (LMH) |
Measuring receiver sensitivity for all channels is time-consuming but reveals any spurious or noise coupled to the nRF9160 antenna port.
The Reference Measurement Channel (RMC) used in the NB-IoT mode is defined by the following 3GPP TS 36.101 annexes: