LTE-M mode

The following table shows recommended test cases for conducted LTE-M signaling mode.

Table 1. RF performance tests 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 >33 dB Pmax, E-UTRA ACLR±1
Spurious emissions (9 kHz to 12.75 GHz) 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: