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 | <-33 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 nRF9160 antenna port.
The Reference Measurement Channel (RMC) used in the LTE-M mode is defined by the following 3GPP TS 36.101 annexes: