7.8.1F Wide band Intermodulation for category NB1 and NB2
36.521-13GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Part 1: Conformance testingRadio transmission and receptionRelease 17TSUser Equipment (UE) conformance specification
7.8.1F.1 Test purpose
Intermodulation response tests the UE’s ability to receive data with a given average throughput for a specified reference measurement channel, in the presence of two or more interfering signals which have a specific frequency relationship to the wanted signal, under conditions of ideal propagation and no added noise.
A UE unable to meet the throughput requirement under these conditions will decrease the coverage area when two or more interfering signals exist which have a specific frequency relationship to the wanted signal.
7.8.1F.2 Test applicability
This test case applies to all types of NB-IoT FDD UE release 13 and forward of category NB1.
This test case applies to all types of NB-IoT FDD UE release 14 and forward of category NB2.
This test case applies to all types of NB-IoT TDD UE release 15 and forward of category NB1 and NB2.
7.8.1F.3 Minimum conformance requirements
The throughput shall be ≥ 95% of the maximum throughput of the reference measurement channel as specified in Annex A.3.2 with parameters specified in Table 7.8.1F.3-1 for the specified wanted signal mean power in the presence of two interfering signals.
Table 7.8.1F.3-1: Wide band intermodulation for category NB1 and NB2
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Parameters for wideband intermodulation |
|
|
Category NB1 or NB2 Signal power |
REFSENS + 12 dB |
|
CW interferer signal power |
– 46 dBm |
|
1.4 MHz E-UTRA interferer signal power |
– 46 dBm |
|
CW interferer offset |
± 2.2 MHz |
|
1.4 MHz E-UTRA interferer |
± 4.4 MHz |
The normative reference for this requirement is TS 36.101 [2] clause 7.8.1F.
7.8.1F.4 Test description
7.8.1F.4.1 Initial condition
Initial conditions are a set of test configurations the UE needs to be tested in and the steps for the SS to take with the UE to reach the correct measurement state.
The initial test configurations consist of environmental conditions and test frequencies based on the subset of E-UTRA operating bands defined for NB-IoT in clause 5.2F. All of these configurations shall be tested with applicable test parameters, and are shown in table 7.8.1F.4.1-1. The details of the downlink reference measurement channels (RMCs) are specified in Annex A.3. Configurations of NPDSCH and NPDCCH before measurement are specified in Annex C.2.
Table 7.8.1F.4.1-1: Test Configuration Table
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Initial Conditions |
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Test Environment as specified in TS 36.508 [7] clause 8.1.1 |
NC |
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Test Frequencies as specified in TS36.508 [7] clause 8.1.3.1 |
Frequency ranges defined in Annex K.1.1 |
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Configuration ID |
Downlink Configuration |
Uplink Configuration |
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|
Modulation |
Subcarriers |
Modulation |
Ntones |
Subcarrier spacing |
|
|
1 |
QPSK |
12 |
BPSK |
1@0 |
15 kHz |
1. Connect the SS to the UE antenna connector as shown in TS 36.508 [7] Annex A, Figure A.6 using only the main UE Tx/Rx antenna.
2. The parameter settings for the cell are set up according to TS 36.508 [7] subclause 8.1.4.3
3. Downlink signals are initially set up according to Annex C.0, C.1 and C.2, and NPUSCH Format 2 is used to carry ACK/NACK on the uplink.
4. The DL Reference Measurement channel is set according to Table 7.8.1F.4.1-1.
5. Propagation conditions are set according to Annex B.0.
6. Ensure the UE is in State 2A-NB with CP CIoT Optimisation according to TS 36.508 [7] clause 8.1.5. Message contents are defined in clause 7.8.1F.4.3.
7.8.1F.4.2 Test procedure
1. SS transmits NPDSCH via NPDCCH DCI format N1 for C_RNTI to transmit the DL RMC according to Table 7.8.1F.4.1-1. The SS sends downlink MAC padding bits on the DL RMC. The UE will send HARQ feedback based on information contained in DCI format N1.
2. Set the Downlink signal level according to the Table 7.8.1F.5-1.
3. Set the Interfering signal levels to the values as defined in Table 7.8.1F.5-1 and frequency below the wanted signal, using a modulated interferer bandwidth as defined in Annex D of the present document.
4. Measure the average throughput for a duration sufficient to achieve statistical significance according to Annex G.2.
5. Repeat steps from 2 to 4, using an interfering signal above the wanted signal at step 3.
7.8.1F.4.3 Message contents
Message contents are according to TS 36.508 [7] clause 8.1.6
7.8.1F.5 Test requirements
The throughput shall be ≥ 95% of the maximum throughput of the reference measurement channels as specified in Annex A.3.2 with parameters specified in Table 7.8.1F.5-1 for the specified wanted signal mean power in the presence of two interfering signals.
Table 7.8.1F.5-1: Test parameters for Wide band intermodulation for category NB1 and NB2
|
Parameters for wideband intermodulation |
|
|
Category NB1 or NB2 Signal power |
REFSENS + 12 dB |
|
CW interferer signal power |
– 46 dBm |
|
1.4 MHz E-UTRA interferer signal power |
– 46 dBm |
|
CW interferer offset [MHz] |
-BW/2 – 2.1 / +BW/2 + 2.1 |
|
1.4 MHz E-UTRA interferer offset [MHz] |
2*CW interferer offset |