7.5F Adjacent Channel Selectivity (ACS) 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
7.5F.1 Test purpose
Adjacent channel selectivity tests the UE’s ability to receive data with a given average throughput for a specified reference measurement channel, in the presence of an adjacent channel signal at a given frequency offset from the centre frequency of the assigned channel, 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 other e-NodeB transmitters exist in the adjacent channel.
7.5F.2 Test applicability
This test case applies to all types of E-UTRA FDD UE release 13 and forward of category NB1 UE.
This test case applies to all types of E-UTRA FDD UE release 14 and forward of category NB2 UE.
This test case applies to all types of E-UTRA TDD UE release 15 and forward of category NB1 and NB2.
7.5F.3 Minimum conformance requirements
Adjacent Channel Selectivity (ACS) is a measure of a receiver’s ability to receive a signal at its assigned channel frequency in the presence of an adjacent channel signal at a given frequency offset from the centre frequency of the assigned channel. ACS is the ratio of the receive filter attenuation on the assigned channel frequency to the receive filter attenuation on the adjacent channel(s).
Category NB1 and NB2 UE shall fulfil the minimum requirement specified in Table 7.5F.3-1 for all values of an adjacent channel interferer up to –25 dBm. However it is not possible to directly measure the ACS, instead the lower and upper range of test parameters are chosen in Table 7.5F.3-1 where the throughput shall be ≥ 95% of the maximum throughput of the reference measurement channel as specified in Annex A.3.2.
Table 7.5F.3-1: Adjacent channel selectivity parameters for category NB1 and NB2 UE
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ACS1 test Parameters |
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Interferer |
GSM (GMSK) |
E-UTRA |
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Category NB1 or NB2 signal power (Pwanted ) / dBm |
REFSENS + 14 dB |
|
|
interferer signal power (PInterferer ) / dBm |
REFSENS + 42 dB |
REFSENS + 47 dB |
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Interferer bandwidth |
200 kHz |
5 MHz |
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Interferer offset from category NB1 or NB2 channel edge |
±200 kHz |
±2.5 MHz |
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ACS2 test Parameters |
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Interferer |
GSM (GMSK) |
E-UTRA |
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Category NB1 or NB2 signal power (Pwanted ) / dBm |
-25 dBm -28 dB |
-25 dBm -33 dB |
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interferer signal power (PInterferer ) / dBm |
-25 dBm |
|
|
Interferer bandwidth |
200 kHz |
5 MHz |
|
Interferer offset from category NB1 or NB2 channel edge |
±200 kHz |
±2.5 MHz |
The normative reference for this requirement is TS 36.101 [2] clause 7.5.1F.
7.5F.4 Test description
7.5F.4.1 Initial conditions
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 7.5F.4.1-1. The details of the downlink reference measurement channel (RMC) are specified in Annex A.3. Configurations of NPDSCH and NPDCCH before measurement are specified in Annex C.2.
Table 7.5F.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 |
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1 |
QPSK |
12 |
BPSK |
1@0 |
15kHz |
1. Connect the SS to the UE antenna connector as shown in TS 36.508 [7] Annex A, Figure A.4 using only the main UE Tx/Rx antenna, and noting that the interference can be either GSM or E-UTRA.
2. The parameter settings for the cell are set up according to TS 36.508 [7] clause 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 7.5F.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 7.5F.4.3.
7.5F.4.2 Test procedure
1. SS transmits NPDSCH via NPDCCH DCI format N1 for C_RNTI to transmit the DL RMC according to Table 7.5F.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 to the value defined for ACS1, GSM in Table 7.5F.5-1. For steps 2 to 5 and 6 to 9, use the default message contents.
3. Set the Interferer signal level to the value defined for ACS1, GSM in Table 7.5F.5-1, with frequency below the wanted signal according to table 7.5F.5-1, using a modulated interferer bandwidth as defined in Annex D.2 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 2 to 4, using an interfering signal above the wanted signal at step 3.
6. Set the Downlink signal level to the value defined for ACS1, E-UTRA in Table 7.5F.5-1.
7. Set the Interferer signal level to the value defined for ACS1, E-UTRA in Table 7.5F.5-1, with frequency below the wanted signal according to table 7.5F.5-1, using a modulated interferer bandwidth as defined in Annex D.2 of the present document.
8. Measure the average throughput for a duration sufficient to achieve statistical significance according to Annex G.2.
9. Repeat steps 6 to 8, using an interfering signal above the wanted signal at step 7.
10. Release the connection through State 3A-NB.
11. Modify system information elements according to Table 7.5F.4.3-1 and notify the UE via paging message with SystemInformationModification included.
12. Ensure the UE is in State 2A-NB with CP CIoT Optimisation according to TS 36.508 [7] clause 8.1.5 using the new UL power control setting.
13. SS transmits NPDSCH via NPDCCH DCI format N1 for C_RNTI to transmit the DL RMC according to Table 7.5F.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.
14. Set the Downlink signal level to the value defined for ACS2, GSM in Table 7.5F.5-1. For steps 14 to 17 and 18 to 21, use message contents with the exceptions defined in Table 7.5F.4.3-1.
15. Set the Interferer signal level to the value defined for ACS2, GSM in Table 7.5F.5-1, with frequency below the wanted signal according to table 7.5F.5-1, using a modulated interferer of 5MHz bandwidth defined in Annex D.2 of the present document.
16. Measure the average throughput for a duration sufficient to achieve statistical significance according to Annex G.2.
17. Repeat steps 14 to 16, using an interfering signal above the wanted signal at step 15.
18. Set the Downlink signal level to the value defined for ACS2, E-UTRA in Table 7.5F.5-1.
19. Set the Interferer signal level to the value defined for ACS2, E-UTRA in Table 7.5F.5-1, with frequency below the wanted signal according to table 7.5F.5-1, using a modulated interferer of 5MHz bandwidth defined in Annex D.2 of the present document.
20. Measure the average throughput for a duration sufficient to achieve statistical significance according to Annex G.2.
21. Repeat steps 18 to 20, using an interfering signal above the wanted signal at step 19.
7.5F.4.3 Message contents
Message contents are according to TS 36.508 [7] clause 8.1.6 with the following exceptions:
Table 7.5F.4.3-1: UplinkPowerControlCommon-NB-DEFAULT: ACS2
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Derivation Path: TS 36.508 [7] clause 8.1.6.3, Table 8.1.6.3-14 UplinkPowerControlCommon-NB-DEFAULT |
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Information Element |
Value/remark |
Comment |
Condition |
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UplinkPowerControlCommon-NB-DEFAULT ::= SEQUENCE { p0-NominalNPUSCH-r13 |
-70 |
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7.5F.5 Test requirement
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 7.5F.5-1.
Table 7.5F.5-1: Test parameters for Adjacent channel selectivity, category NB1 and NB2
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ACS1 test Parameters |
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|
Interferer |
GSM (GMSK) |
E-UTRA |
|
Category NB1 or NB2 signal power (Pwanted) / dBm |
REFSENS + 14 dB |
|
|
interferer signal power (PInterferer ) / dBm |
REFSENS + 42 dB |
REFSENS + 47 dB |
|
Interferer bandwidth |
200 kHz |
5 MHz |
|
Interferer offset from category NB1 or NB2 channel edge |
±200 kHz |
±2.5 MHz |
|
ACS2 test Parameters |
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Interferer |
GSM (GMSK) |
E-UTRA |
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Category NB1 or NB2 signal power (Pwanted) / dBm |
-53 dBm |
-58 dBm |
|
interferer signal power (PInterferer) / dBm |
-25 dBm |
|
|
Interferer bandwidth |
200 kHz |
5 MHz |
|
Interferer offset from category NB1 or NB2 channel edge |
±200 kHz |
±2.5 MHz |