8.5 Performance requirements for Narrowband IoT
36.1413GPPBase Station (BS) conformance testingEvolved Universal Terrestrial Radio Access (E-UTRA)Release 17TS
8.5.1 Performance requirements for NPUSCH format 1
8.5.1.1 Definition and applicability
The performance requirement of NPUSCH format 1 is determined by a minimum required throughput for a given SNR. The required throughput is expressed as a fraction of maximum throughput for the FRCs listed in Annex A. The performance requirements assume HARQ re-transmissions.
The tests for 3.75KHz subcarrier spacing are applicable to the base stations supporting 3.75 kHz subcarrier spacing requirements. The tests for single-subcarrier/multi-subcarrier of 15KHz subcarrier spacing are applicable to the base stations supporting the number of subcarriers of 15 kHz subcarrier spacing requirements.
The tests defined in Table 8.5.1.5-4 are applicable to the base stations supporting two HARQ processes, multiple TBs scheduling with interleaved transmission when multiple TBs are scheduled.
The test defined in Table 8.5.1.5-5 is applicable to the base stations supporting 16QAM single TB scheduling.
8.5.1.2 Minimum Requirement
The minimum requirement is in TS 36.104 [2] subclause 8.5.1.
8.5.1.3 Test Purpose
The test shall verify the receiver’s ability to achieve the throughput under multipath fading propagation conditions for a given SNR.
8.5.1.4 Method of test
8.5.1.4.1 Initial Conditions
Test environment: Normal, see subclause D.2.
RF channels to be tested: M; see subclause 4.7.
1) Connect the BS tester generating the wanted signal, multipath fading simulators and AWGN generators to all BS antenna connectors for diversity reception via a combining network as shown in Annex I.3.2.
8.5.1.4.2 Procedure
1) Adjust the AWGN generator, according to the channel bandwidth, defined in Table 8.5.1.4.2-1.
Table 8.5.1.4.2-1: AWGN power level at the BS input
|
Channel bandwidth [KHz] |
AWGN power level |
|
200 |
-100.5dBm /180KHz |
2) The characteristics of the wanted signal shall be configured according to the corresponding UL reference measurement channel defined in annex A and the test parameters in Table 8.5.1.4.2-2.
Table 8.5.1.4.2-2: Test parameters for testing NPUSCH format 1
|
Parameter |
unit |
Value |
|
Maximum number of HARQ transmissions |
4 |
|
|
RV sequences |
RV0, RV2 |
3) The multipath fading emulators shall be configured according to the corresponding channel model defined in annex B.
4) Adjust the equipment so that required SNR specified in tables 8.5.1.5-1 to 8.5.1.5-3 is achieved at the BS input.
5) The signal generator sends a test pattern with the pattern outlined in Figure 8.5.1.4.2-1. For each of the reference channels in Table 8.5.1.5-1 to 8.5.1.5-3 applicable for the base station, measure the throughput, according to annex E.
Figure 8.5.1.4.2-1: Test signal pattern for NPUSCH format 1 demodulation tests
8.5.1.5 Test Requirement
The throughput measured according to subclause 8.5.1.4.2 shall not be below the limits for the SNR levels specified in Table 8.5.1.5-1 for 3.75KHz subcarrier spacing tests, not be below the limits for the SNR levels specified in Table 8.5.1.5-2 for 15KHz subcarrier spacing with single subcarrier tests and not be below the limits for the SNR levels specified in Table 8.5.1.5-3 for 15KHz subcarrier spacing with the supported number of subcarrier tests.
Table 8.5.1.5-1 Required SNR for NPUSCH format 1 test, 200KHz Channel Bandwidth, 3.75KHz subcarrier spacing, 1Tx
|
Number of TX antennas |
Number of RX antennas |
Subcarrier spacing |
Number of allocated subcarriers |
Propagation conditions and correlation matrix (Annex B) |
FRC |
Repetition number |
Fraction of maximum throughput |
SNR [dB] |
|
1 |
2 |
3.75KHz |
1 |
ETU 1Hz Low |
A16-1 |
1 |
70% |
-1.3 |
|
16 |
70% |
-8.6 |
||||||
|
64 |
70% |
-11.6 |
Table 8.5.1.5-2 Required SNR for NPUSCH format 1 test, 200KHz Channel Bandwidth, 15KHz subcarrier spacing, single subcarrier, 1Tx
|
Number of TX antennas |
Number of RX antennas |
Subcarrier spacing |
Number of allocated subcarriers |
Propagation conditions and correlation matrix (Annex B) |
FRC |
Repetition number |
Fraction of maximum throughput |
SNR [dB] |
|
1 |
2 |
15KHz |
1 |
ETU 1Hz Low |
A16-2 |
1 |
70% |
-1.5 |
|
16 |
70% |
-8.2 |
||||||
|
64 |
70% |
-12 |
Table 8.5.1.5-3 Required SNR for NPUSCH format 1 test, 200KHz Channel Bandwidth, 15KHz subcarrier spacing, multiple subcarriers, 1Tx
|
Number of TX antennas |
Number of RX antennas |
Subcarrier spacing |
Number of allocated subcarriers |
Propagation conditions and correlation matrix (Annex B) |
FRC |
Repetition number |
Fraction of maximum throughput |
SNR [dB] |
|
1 |
2 |
15KHz |
3 |
ETU 1Hz Low |
A16-3 |
2 |
70% |
-2.4 |
|
16 |
70% |
-7.5 |
||||||
|
64 |
70% |
-10.8 |
||||||
|
6 |
ETU 1Hz Low |
A16-4 |
2 |
70% |
0 |
|||
|
16 |
70% |
-6.2 |
||||||
|
64 |
70% |
-9.9 |
||||||
|
12 |
ETU 1Hz Low |
A16-5 |
2 |
70% |
-0.1 |
|||
|
16 |
70% |
-5.8 |
||||||
|
64 |
70% |
-9.5 |
Table 8.5.1.5-4: Required SNR for NPUSCH format 1 with two HARQ processes and multiple TBs with interleaved transmission
|
Number of TX antennas |
Number of RX antennas |
Subcarrier spacing |
Number of allocated subcarriers |
Propagation conditions and correlation matrix (Annex B) |
FRC |
Repetition number |
Fraction of maximum throughput |
SNR [dB] |
|
1 |
2 |
15KHz |
12 |
ETU 1Hz Low |
A16-6 |
64 |
70% |
-13.3 |
NOTE: If the above Test Requirement differs from the Minimum Requirement then the Test Tolerance applied for this test is non-zero. The Test Tolerance for this test and the explanation of how the Minimum Requirement has been relaxed by the Test Tolerance is given in Annex G.
Table 8.5.1.5-5: Required SNR for NPUSCH format 1 16QAM, 200KHz Channel Bandwidth, single TB scheduling
|
Number of TX antennas |
Number of RX antennas |
Subcarrier spacing |
Number of allocated subcarriers |
Propagation conditions and correlation matrix (Annex B) |
FRC |
Repetition number |
Fraction of maximum throughput |
SNR [dB] |
|
1 |
2 |
15KHz |
12 |
ETU 1Hz Low |
A16-7 |
1 |
70% |
[9.7] |
8.5.2 ACK missed detection for NPUSCH format 2
8.5.2.1 Definition and applicability
The performance requirement of NPUSCH format 2 for ACK missed detection is determined by the two parameters: probability of false detection of the ACK and the probability of detection of ACK. The performance is measured by the required SNR at probability of detection equal to 0.99. The probability of false detection of the ACK shall be 0.01 or less.
The probability of false detection of the ACK is defined as a conditional probability of erroneous detection of the ACK when input is only noise.
The probability of detection of ACK is defined as conditional probability of detection of the ACK when the ACK was sent per NPUSCH format 2 transmission when the signal is present.
The tests for 3.75KHz subcarrier spacing are applicable to the base stations supporting 3.75 KHz subcarrier spacing requirements. The tests for 15KHz subcarrier spacing are applicable to the base stations supporting 15KHz subcarrier spacing requirements.
8.5.2.2 Minimum Requirement
The minimum requirement is in TS 36.104 [2] subclause 8.5.2.1 and 8.5.2.2.
8.5.2.3 Test purpose
The test shall verify the receiver’s ability to detect ACK under multipath fading propagation conditions for a given SNR.
8.5.2.4 Method of test
8.5.2.4.1 Initial Conditions
Test environment: Normal, see subclause D.2.
RF channels to be tested: M; see subclause 4.7
1) Connect the BS tester generating the wanted signal, multipath fading simulators and AWGN generators to all BS antenna connectors for diversity reception via a combining network as shown in Annex I.3.2.
8.5.2.4.2 Procedure
1) Adjust the AWGN generator, according to the channel bandwidth defined in Table 8.5.2.4.2-1.
Table 8.5.2.4.2-1: AWGN power level at the BS input
|
Channel bandwidth [KHz] |
AWGN power level |
|
200 |
-100.5dBm /180KHz |
2) The characteristics of the wanted signal shall be configured according to TS 36.211 [12].
3) The multipath fading emulators shall be configured according to the corresponding channel model defined in Annex B.
4) Adjust the equipment so that the SNR specified in tables 8.5.2.5-1 to 8.5.2.5-2 is achieved at the BS input during the ACK transmissions.
5) The signal generator sends a test pattern with the pattern outlined in figure 8.5.2.4.2-1. The following statistics are kept: the number of ACKs falsely detected in the idle periods and the number of missed ACKs. Each falsely detected ACK transmission in the idle periods is accounted as one error for the statistics of false ACK detection, and each missed ACK transmission per NPUSCH format 2 transmisson is accounted as one error for the statistics of missed ACK detection.
Figure 8.5.2.4.2-1: Test signal pattern for NPUSCH format 2 demodulation tests
8.5.2.5 Test Requirement
The fraction of falsely detected ACKs shall be less than 1% and the fraction of correctly detected ACKs shall be larger than 99% for the SNR listed in Table 8.5.2.5-1 and Table 8.5.2.5-2.
Table 8.5.2.5-1 Required SNR for NPUSCH format 2 test, 200KHz Channel Bandwidth, 3.75KHz subcarrier spacing, 1Tx
|
Number of TX antennas |
Number of RX antennas |
Propagation conditions and correlation matrix (Annex B) |
Number of allocated subcarriers |
Subcarrier spacing |
Repetition number |
SNR [dB] |
|
1 |
2 |
EPA 5 Low |
1 |
3.75KHz |
1 |
7.6 |
|
16 |
-4.7 |
|||||
|
64 |
-10.3 |
Table 8.5.2.5-2 Required SNR for NPUSCH format 2 test, 200KHz Channel Bandwidth, 15KHz subcarrier spacing, 1Tx
|
Number of TX antennas |
Number of RX antennas |
Propagation conditions and correlation matrix (Annex B) |
Number of allocated subcarriers |
Subcarrier spacing |
Repetition number |
SNR [dB] |
|
1 |
2 |
EPA 5 Low |
1 |
15KHz |
1 |
6.9 |
|
16 |
-3.3 |
|||||
|
64 |
-8.9 |
NOTE: If the above Test Requirement differs from the Minimum Requirement then the Test Tolerance applied for this test is non-zero. The Test Tolerance for this test and the explanation of how the Minimum Requirement has been relaxed by the Test Tolerance is given in Annex G.
8.5.3 Performance requirements for NPRACH
8.5.3.1 Definition and applicability
The performance requirement of NPRACH for preamble detection is determined by two parameters: the total probability of false detection of the preamble (Pfa) and the probability of detection of the preamble (Pd). The performance is measured for the required SNR
– at probability of Pd which shall not be smaller than 99% and
– at probability of Pfa which shall not be larger than 0.1%.
Pfa is defined as a conditional total probability of erroneous detection of the preamble (i.e. erroneous detection from any detector) when input is only noise.
Pd is defined as conditional probability of detection of the preamble when the signal is present. The erroneous detection consists of several error cases – detecting different preamble than the one that was sent, not detecting a preamble at all or correct preamble detection but with the wrong timing estimation. A timing estimation error occurs if the estimation error of the timing of the strongest path is larger than 3.646 us. The strongest path for the timing estimation error refers to the strongest path in the power delay profile.
The performance requirements for TDD are optional and only valid for base stations supporting TDD.
The parameters of NPRACH test preambles are listed in Table 8.5.3.1-1.
Table 8.5.3.1-1 NPRACH Test Parameters
|
Parameter |
Value |
Value |
|
Narrowband physical layer cell identity |
0 |
0 |
|
Initial subcarrier index |
0 |
0 |
|
nprach-Periodicity (ms) |
160 for preamble format 2, otherwise 80 |
[1280] for preamble format 2, otherwise 320 |
|
nprach-SubcarrierOffset |
0 |
0 |
|
numRepetitionsPerPreambleAttempt |
8 |
32 |
|
nprach-NumSubcarriers |
36 for FDD preamble format 2, otherwise 12 |
|
|
Uplink-downlink configuration for TDD |
1 |
|
|
Special subframe configuration for TDD |
7 |
|
8.5.3.2 Minimum Requirement
The minimum requirement is in TS 36104 [2] subclause 8.5.3.1.1 and 8.5.3.2.1.
8.5.3.3 Test purpose
The test shall verify the receiver’s ability to detect NPRACH preamble under multipath fading propagation conditions for a given SNR.
8.5.3.4 Method of test
8.5.3.4.1 Initial Conditions
Test environment: Normal, see subclause D.2.
RF channels to be tested: M; see subclause 4.7.
1) Connect the BS tester generating the wanted signal, multipath fading simulators and AWGN generators to all BS antenna connectors for diversity reception via a combining network as shown in Annex I.3.2.
8.5.3.4.2 Procedure
1) Adjust the AWGN generator, according to the channel bandwidth.
Table 8.5.3.4.2-1: AWGN power level at the BS input
|
Channel bandwidth [KHz] |
AWGN power level |
|
200 |
-100.5dBm /180KHz |
2) The characteristics of the wanted signal shall be configured according to the corresponding UL reference measurement channel defined in Annex A.
3) The multipath fading emulators shall be configured according to the corresponding channel model defined in Annex B.
4) Adjust the frequency offset of the test signal according to Table 8.5.3.5-1.
5) Adjust the equipment so that the SNR specified in Table 8.5.3.5-1 is achieved at the BS input during the NPRACH preambles.
6) The test signal generator sends a preamble with repetitions and the receiver tries to detect the preamble. This pattern is repeated as illustrated in figure 8.5.3.4.2-1. The preambles are sent with a fixed timing offset of during the test, where is NPRACH cyclic prefix of length as defined in TS36.211 [12]. The following statistics are kept: the number of preambles detected in the idle period and the number of missed preambles.
Figure 8.5.3.4.2-1: NPRACH preamble test pattern
8.5.3.5 Test Requirement
Pfa shall not exceed 0.1% and Pmd shall not exceed 1% for the SNRs in Table 8.5.3.5-1.
Table 8.5.3.5-1: NPRACH missed detection test requirements for FDD
|
Number of TX antennas |
Number of RX antennas |
Repetition number |
Propagation conditions and correlation matrix (Annex B) |
Frequency offset |
SNR[dB] |
||
|
Preamble format 0 |
Preamble format 1 |
Preamble format 2 |
|||||
|
1 |
2 |
8 |
AWGN |
0 |
-1.8 |
-1.8 |
-0.7 |
|
EPA1 Low |
200 Hz |
6.7 |
6.7 |
9.6 |
|||
|
32 |
AWGN |
0 |
-6.5 |
-6.5 |
-4.8 |
||
|
EPA1 Low |
200 Hz |
1.1 |
1.1 |
2.8 |
|||
Table 8.5.3.5-2: NPRACH missed detection requirements for TDD
|
Number of TX antennas |
Number of RX antennas |
Repetition number |
Propagation conditions and correlation matrix (Annex B) |
Frequency offset |
SNR[dB] |
|||
|
Preamble format 0 |
Preamble format 1 |
Preamble format 0-a |
Preamble format 1-a |
|||||
|
1 |
2 |
8 |
AWGN |
0 |
5.9 |
2.8 |
4.3 |
1.3 |
|
EPA1 Low |
200 Hz |
15.3 |
10.7 |
14.3 |
9.6 |
|||
|
32 |
AWGN |
0 |
1.2 |
-1.9 |
-0.4 |
-3.3 |
||
|
EPA1 Low |
200 Hz |
10.4 |
4.9 |
10.6 |
3.1 |
|||
NOTE: If the above Test Requirement differs from the Minimum Requirement then the Test Tolerance applied for this test is non-zero. The Test Tolerance for this test and the explanation of how the Minimum Requirement has been relaxed by the Test Tolerance is given in Annex G.