The following table shows recommended test cases for conducted LTE-M signaling mode.
| Mode | Test item | 3GPP test ID | Band/ Channel | Temp/ Voltage | Signaling parameters | Expected result | Note |
|---|---|---|---|---|---|---|---|
| LTE-M TX | Maximum output power | 6.2.2E | ALL/LMH | TYP/EXT | 5 MHz, QPSK (RMC), Pmax | 22 dBm | Pmax, 22 dBm ±2 dB (5 MHz, 6 RB) |
| Frequency error | 6.5.1E | ALL/MID | TYP/TYP | <±0.1 ppm | Pmax | ||
| PUSCH EVM (RMS) | 6.5.2E.1 | ALL/LMH | TYP/EXT | <6% | Pmax, 3GPP limit <17.5% | ||
| Adjacent channel leakage power ratio | 6.6.2.3 | >33 dB | Pmax, E-UTRA ACLR ±1 | ||||
| Spurious emissions (9 kHz to 12.75 GHz) | 6.6.3.1 | ALL/MID | TYP/TYP | <–40 dBm/1 MHz | Pmax, harmonics, spurious, noise | ||
| LTE-M RX | Reference sensitivity level | 7.3 | ALL/ALL | <–105 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 nRF9151 antenna port.
The Reference Measurement Channel (RMC) used in the LTE-M mode is defined by the following 3GPP TS 36.101 annexes:
- Annex A.2.2.1.1-1b – Reference Channels for QPSK with full/maximum RB allocation for UE UL category M1
- Annex A.3.2-1b – Fixed Reference Channel for Receiver Requirements (FDD and HD-FDD) –for CAT-M1