6.7B Transmit intermodulation for UL-MIMO
36.521-13GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Part 1: Conformance testingRadio transmission and receptionRelease 17TSUser Equipment (UE) conformance specification
6.7B.1 Test purpose
To verify that the UE transmit intermodulation at each transmit antenna does not exceed the described value in the test requirement.
The transmit intermodulation performance is a measure of the capability of the transmitter to inhibit the generation of signals in its non linear elements caused by presence of the wanted signal and an interfering signal reaching the transmitter via the antenna.
6.7B.2 Test applicability
This test applies to all types of E-UTRA UE release 10 and forward that support UL-MIMO.
6.7B.3 Minimum conformance requirements
For UE with multiple antenna transmit connectors, the transmit intermodulation requirements are specified at each transmit antenna connector and the wanted signal is defined as the sum of output power at each transmit antenna connector.
For UEs with two transmit antenna connectors supporting dual-layer transmission, the requirements in subclause 6.7.3-1 apply to each transmit antenna connector with the UL-MIMO configurations specified in Table 6.2.2B.3-2.
The normative reference for this requirement is TS 36.101 [2] clause 6.7.1B.
6.7B.4 Test description
6.7B.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, test frequencies, and channel bandwidths based on E-UTRA operating bands specified in table 5.4.2.1-1. All of these configurations shall be tested with applicable test parameters for each channel bandwidth, and are shown in table 6.7B.4.1-1. The details of the uplink reference measurement channels (RMCs) are specified in Annexes A.2. Configurations of PDSCH and PDCCH before measurement are specified in Annex C.2.
Table 6.7B.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] subclause 4.1 |
Normal |
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Test Frequencies as specified in TS36.508 [7] subclause 4.3.1 |
Mid range |
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Test Channel Bandwidths as specified in TS 36.508 [7] subclause 4.3.1 |
5MHz and Highest |
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Test Parameters for Channel Bandwidths |
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Downlink Configuration |
Uplink Configuration |
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Ch BW |
N/A for Transmit Intermodulation |
Mod’n |
RB allocation |
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FDD |
TDD |
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5MHz |
QPSK |
8 |
8 |
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10MHz |
QPSK |
12 |
12 |
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15MHz |
QPSK |
16 |
16 |
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20MHz |
QPSK |
18 |
18 |
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Note 1: Test Channel Bandwidths are checked separately for each E-UTRA band, the applicable channel bandwidths are specified in Table 5.4.2.1-1. |
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1. Connect the SS to the UE antenna connectors as shown in TS 36.508 [7] Annex A, Figure A.39.
2. The parameter settings for the cell are set up according to TS 36.508 [7] subclause 4.4.3.
3. Downlink signals are initially set up according to Annex C.0, C.1, and C.3.0, and uplink signals according to Annex H.1 and H.3.0.
4. The UL Reference Measurement channels are set according to Table 6.7B.4.1-1.
5. Propagation conditions are set according to Annex B.0.
6. Ensure the UE is in State 3A-RF according to TS 36.508 [7] clause 5.2A.2. Message contents are defined in clause 6.7B.4.3.
6.7B.4.2 Test procedure
1. SS sends uplink scheduling information for each UL HARQ process via PDCCH DCI format 4 for C_RNTI to schedule the UL RMC according to Table 6.7B.4.1-1. Since the UE has no payload and no loopback data to send the UE sends uplink MAC padding bits on the UL RMC.
2. Send continuously uplink power control "up" commands to the UE until the UE transmits at its PUMAX level.
3. Measure the rectangular filtered mean power of the UE. For TDD slots with transient periods are not under test for the wanted signal and for the intermodulation product.
4. Set the interference signal frequency below the UL carrier frequency using the first offset in table 6.7B.5-1.
5. Set the interference CW signal level according to table 6.7B.5-1.
6. Search the intermodulation product signals below and above the UL carrier frequency, then measure the rectangular filtered mean power of transmitting intermodulation for both signals, and calculate the ratios with the power measured in step 3.
7. Set the interference signal frequency above the UL carrier frequency using the first offset in table 6.7B.5-1.
8. Search the intermodulation product signals below and above the UL carrier frequency, then measure the rectangular filtered mean power of transmitting intermodulation for both signals, and calculate the ratios with the power measured in step 3.
9. Repeat the measurement using the second offset in table 6.7B.5-1.
10. Repeat step 3) until 9) for each of transmit antenna of the UE.
6.7B.4.3 Message contents
Message contents are according to TS 36.508 [7] clause 4.6.6.7B.5 Test requirement
The ratio derived in step 5 and 7 at each transmit antenna of UE shall not exceed the described value in table 6.7B.5-1.
Table 6.7B.5-1: Transmit Intermodulation
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BWChannel (UL) |
5MHz |
10MHz |
15MHz |
20MHz |
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Interference Signal Frequency Offset |
5MHz |
10MHz |
10MHz |
20MHz |
15MHz |
30MHz |
20MHz |
40MHz (Note 1) |
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Interference CW Signal Level |
-40dBc |
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Intermodulation Product |
-29dBc |
-35dBc |
-29dBc |
-35dBc |
-29dBc |
-35dBc |
-29dBc |
-35dBc |
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Measurement bandwidth |
4.5MHz |
4.5MHz |
9.0MHz |
9.0MHz |
13.5MHz |
13.5MHz |
18MHz |
18MHz |
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Note 1: For Band 20, only applicable for interference signal frequency above the UL carrier frequency. |
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