4 Test conditions

38.1243GPPElectromagnetic compatibility (EMC) requirements for mobile terminals and ancillary equipmentNRRelease 17TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

4.1 General

The equipment shall be tested under normal test conditions according to the relevant product and basic standards. If these conditions are not specified then the manufacturers declared range of humidity, temperature and supply voltage shall be used. The test conditions shall be recorded in the test report.

Whenever the Equipment under test (EUT) is provided with a detachable antenna, the EUT shall be tested with the antenna fitted in a manner typical of normal intended use, unless specified otherwise.

Where the equipment incorporates an external 50 Ω RF antenna connector that is normally connected via a coaxial cable, then the wanted signal to establish a communication link also uses a coaxial cable.

Where the equipment has an external 50 Ω RF antenna connector that is not normally connected via a coaxial cable or where the equipment has no external 50 Ω RF connector (i.e., integral antenna equipment), then the wanted signal, to establish a communication link, shall be delivered from the equipment to an antenna located within the test environment.

Requirements throughout the RF specifications are in many cases defined separately for different frequency ranges (FR). The frequency ranges in which a UE equipment (NR) can operate according to this version of the specification are identified as described in table 4.1-1. The test conditions may be different for operations in FR1 and FR2.

Table 4.1-1: Definition of frequency ranges

Frequency range designation	Corresponding frequency range
FR1	410 MHz – 7125 MHz
FR2	24250 MHz – 52600 MHz

4.2 Arrangements for establishing a communication link

For transmitters with an integral antenna, the wanted RF output signal to establish a communication link shall be delivered from the EUT to an antenna located within the test environment. This antenna shall be connected to the external measuring equipment by a coaxial cable.

For transmitters with an antenna connector, the wanted RF output signal to establish a communication link shall be delivered from the antenna connector to the external measuring equipment by a shielded transmission line, such as a coaxial cable. Adequate measures shall be taken to minimize the effect of unwanted common mode currents on the external conductor of the transmission line at the point of entry to the transmitter.

The wanted RF input signal nominal frequency shall be selected by setting the NR Absolute Radio Frequency Channel Number to an appropriate number.

For UE equipment only support operations in FR1 a communication link shall be set up with a suitable base station simulator (hereafter called "the test system"). The test system shall be located outside of the test environment.

When the EUT is required to be in the traffic mode, a call is set up according to the generic call set-up procedure and the following conditions shall be met:

– Set and send continuously positive TPC commands to the UE;

– The DTX shall be disabled;

– Uplink power control shall be enabled;

– transmitting and/or receiving (UL/DL) bit rate for reference test channel shall be the reference measurement channel as specified in annex A in TS 38.101-1 [3] with parameters specified in table 7.3.2-1 and table 7.3.2-2 in TS 38.101-1 [3];

– Adequate measures shall be taken to avoid the effect of the unwanted signal on the measuring equipment;

– For immunity testing, the wanted input signal level shall be set to 40 dB above the reference sensitivity level to provide a stable communication link. The reference sensitivity level is defined in TS 38.101-1 [3];

– For emission testing, the wanted input signal level shall be no more than 15 dB above the reference sensitivity level, such that the performance of the measuring receiver is not limited by strong signal effects.

See TS 38.508-1 [21] and TS 38.509 [22] for details regarding generic call set-up procedure and throughput test loop scenarios.

When the EUT is required to be in the idle mode the following conditions shall be met:

– UE shall be camped on a cell

– UE shall perform Location Registration (LR) before the test, but not during the test;

– UE´s neighbour cell list shall be empty;

– Paging repetition period and DRX cycle shall be set to minimum (shortest possible time interval).

For immunity tests, clause 4.3 applies.

4.3 Narrow band responses on receivers

Responses on receivers or duplex transceivers occurring during the test at discrete frequencies, which are narrow band responses (spurious responses), are identified by the following method:

– If during an immunity test the quantity being monitored goes outside the specified tolerances, it is necessary to establish whether the deviation is due to an unwanted effect on the receiver of the UE or on the test system (narrow band response) or to a wide band (EMC) phenomenon. Therefore, the test shall be repeated with the unwanted signal frequency increased or decreased by BW_Channel MHz, where BW_Channel is the channel bandwidth as defined in TS 38.101-1 [3];

– If the deviation does not disappear, the procedure is repeated the unwanted signal frequency increased or decreased by 2 x BW_Channel MHz, where BW_Channel is the channel bandwidth as defined in TS 38.101-1 [3];

– If the deviation does not disappear with the increased and/or decreased frequency, the phenomenon is considered wide band and therefore an EMC problem and the equipment fails the test.

Narrow band responses are disregarded.

The procedure above does not apply to conducted immunity tests in the frequency range 150 kHz to 80 MHz.

4.4 Receiver exclusion band

The receiver exclusion band for terminals extends from the lower frequency of the allocated receiver band minus 85 MHz to the upper frequency of the allocated receiver band plus 85 MHz. The receiver exclusion band for UE is the frequency range over which no tests of radiated immunity of a receiver are made. The exclusions bands are as set out below:

F_DL,low – 85 < f < F_DL,high + 85 (MHz)

Where values of F_DL,low and F_DL,high are defined for each operating band in TS 38.101-1 [3], clause 5.2.