6.5.1F Frequency Error 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
6.5.1F.1 Test purpose
This test verifies the ability of both, the receiver and the transmitter, to process frequency correctly.
Receiver: to extract the correct frequency from the stimulus signal, offered by the System simulator, under ideal propagation conditions and low level.
Transmitter: to derive the correct modulated carrier frequency from the results, gained by the receiver.
6.5.1F.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.
6.5.1F.3 Minimum conformance requirements
For UE category NB1 and NB2, the UE modulated carrier frequency shall be accurate to within the following limits
Table 6.5.1F.3-1: Frequency error requirement for UE category NB1 and NB2
|
Carrier frequency [GHz] |
Frequency error [ppm] |
|
≤1 |
±0.2 |
|
>1 |
±0.1 |
Observed over a period of one time slot (0.5 ms for 15 kHz sub-carrier spacing and 2 ms excluding the 2304Ts gap for 3.75 kHz sub-carrier spacing) and averaged over 72/LCtones slots (where LCtones = {1, 3, 6, 12} is the number of sub-carriers used for the transmission), compared to the carrier frequency received from the E-UTRA Node B.
The normative reference for this requirement is TS 36.101 clause 6.5.1F.
6.5.1F.4 Test description
6.5.1F.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 bands defined for NB-IOT in clause 5.2F. All of these configurations shall be tested with applicable test parameters for each channel bandwidth, and are shown in table 6.5.1F.4.1-1. The details of the uplink reference measurement channels (RMCs) are specified in Annex A.2.4. Configurations of NPDSCH and NPDCCH before measurement are specified in Annex C.2.
Table 6.5.1F.4.1-1: Test Configuration Table for FDD & TDD
|
Initial Conditions |
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Test Environment as specified in TS 36.508[7] subclause 8.1.1 |
NC, TL/VL, TL/VH, TH/VL, TH/VH |
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Test Frequencies as specified in TS36.508 [7] subclause 8.1.3.1 |
Frequency ranges defined in Annex K.1.1 |
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Test Parameters |
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|
Configuration ID |
Downlink Configuration |
Uplink Configuration |
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|
Modulation |
Ntones |
Subcarrier spacing |
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|
1 |
QPSK |
1@0 |
3.75 |
|
|
2 |
QPSK |
1@0 |
15 |
|
|
3 (Note 1) |
QPSK |
3@0 |
15 |
|
|
4 (Note 1) |
QPSK |
6@0 |
15 |
|
|
5 (Note 1) |
QPSK |
12@0 |
15 |
|
|
Note 1: Applicable to UE supporting UL multi-tone transmissions |
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1. Connect the SS to the UE antenna connectors as shown in TS 36.508 [7] Annex A, in Figure A.3 using only 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 C0, C.1 and C.3.0, and uplink signals according to Annex [H.1 and H.3.0].
4. The UL Reference Measurement channel is set according to Table 6.5.1F.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 6.5.1F.4.3.
6.5.1F.4.2 Test procedure
1. SS sends uplink scheduling information for each UL HARQ process via NPDCCH DCI format N0 for C_RNTI to schedule the UL RMC according to Table 6.5.1F.4.1-1, since the UE has no payload data to send, the UE transmit uplink MAC padding bits on the UL RMC. (UE should be already transmitting PUMAX after Initial Conditions setting).
2. Set the Downlink signal level to the appropriate REFSENS value defined in Table 7.3F.1.5-1. For the DL signal, Narrowband IoT OCNG pattern 1 in Annex A.5.3.1 is used.
3. Measure the Frequency Error using Global In-Channel Tx-Test (Annex E). For TDD slots with transient periods are not under test.
NOTE 1: For configuration IDs applicable to UE depending on UE capability in Test Configuration Table with different UL sub-carrier spacing, the SS shall release the connection through State 3A-NB and finally ensure the UE is in State 2A-NB with CP CIoT Optimisation according to TS 36.508 [7] clause 8.1.5 using the appropriate UL subcarrier spacing in Random Access Response message.
6.5.1F.4.3 Message contents
Message contents are according to TS 36.508 [7] subclause 8.1.6.
6.5.1F.5 Test requirement
The 20 frequency error Δf results must fulfil the test requirement:
|Δf| ≤ (0.1 PPM + 15 Hz) (Carrier frequency >1 GHz)
|Δf| ≤ (0.2 PPM + 15 Hz) (Carrier frequency ≤1 GHz)