6.8B Time alignment error for UL-MIMO
36.521-13GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Part 1: Conformance testingRadio transmission and receptionRelease 17TSUser Equipment (UE) conformance specification
6.8B.1 Test purpose
To verify that the error of time alignment in UL MIMO does not exceed the range prescribed by the specified UL MIMO Time Alignment Error (TAE) and tolerance.
An excess time alignment error has the possibility to interfere to other channels or other systems and decrease UL MIMO performance because of the timing unsynchronization.
6.8B.2 Test applicability
This test case applies to all types of E-UTRA UE release 10 and forward that support UL MIMO.
6.8B.3 Minimum conformance requirements
For UE(s) with multiple transmit antenna connectors, the Time Alignment Error (TAE) shall not exceed 130 ns.
Table 6.8B.3-1: UL-MIMO configuration in closed-loop spatial multiplexing scheme
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Transmission mode |
DCI format |
Codebook Index |
|
Mode 2 |
DCI format 4 |
Codebook index 0 |
The normative reference for this requirement is TS 36.101 [2] clause 6.8B.
6.8B.4 Test description
6.8B.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, 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 6.8B.4.1-1. The details of the uplink reference measurement channels (RMCs) are specified in Annexe A.2. Configurations of PDSCH and PDCCH before measurement are specified in Annex C.2.
Table 6.8B.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 4.1 |
Normal |
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Test Frequencies as specified in TS36.508 [7] clause 4.3.1 |
Mid range |
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Test Channel Bandwidths as specified in TS 36.508 [7] clause 4.3.1 |
Lowest, 5MHz, 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 |
Mod’n |
RB allocation |
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|
FDD |
TDD |
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|
1.4MHz |
QPSK |
6 |
6 |
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|
3MHz |
QPSK |
15 |
15 |
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|
5MHz |
QPSK |
25 |
25 |
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|
10MHz |
QPSK |
50 |
50 |
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|
15MHz |
QPSK |
75 |
75 |
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|
20MHz |
QPSK |
100 |
100 |
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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.28.
2. The parameter settings for the cell are set up according to TS 36.508 [7] clause 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 channel is set according to Table 6.8B.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 6.8B.4.3.
6.8B.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 6.8B.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 in every uplink scheduling information to the UE; allow at least 200ms for the UE to reach PUMAX level for UE.
3. Measure the timing of one sub-frame at each antenna connector.
6.8B.4.3 Message contents
Message contents are according to TS 36.508 [7] clause 4.6.
6.8B.5 Test requirements
For UE(s) with multiple transmit antenna connectors, the Time Alignment Error (TAE) shall not exceed 155 ns.