4.9 RF channels and test models
38.176-23GPPIntegrated Access and Backhaul (IAB) conformance testingNRPart 2: radiated conformance testingRelease 17TS
4.9.1 RF channels
For the single carrier testing many tests in the present document are performed with appropriate frequencies in the bottom, middle and top channels of the supported frequency range of the IAB. These are denoted as RF channels B (bottom), M (middle) and T (top).
Unless otherwise stated, the test shall be performed with a single carrier at each of the RF channels B, M and T.
Many tests in the present document are performed with the maximum IAB RF Bandwidth located at the bottom, middle and top of the supported frequency range in the operating band. These are denoted as BRFBW (bottom), MRFBW (middle) and TRFBW (top).
Unless otherwise stated, the test shall be performed at BRFBW, MRFBW and TRFBW defined as following:
– BRFBW: maximum IAB RF Bandwidth located at the bottom of the supported frequency range in the operating band.
– MRFBW: maximum IAB RF Bandwidth located in the middle of the supported frequency range in the operating band.
– TRFBW: maximum IAB RF Bandwidth located at the top of the supported frequency range in the operating band.
For a IAB capable of multi-band operation and capable of dual-band operation, unless otherwise stated, the test shall be performed at BRFBW_T’RFBW and B’RFBW_TRFBW defined as following:
– BRFBW_ T’RFBW: the IAB RF Bandwidths located at the bottom of the supported frequency range in the lower operating band and at the highest possible simultaneous frequency position, within the maximum Radio Bandwidth, in the upper operating band.
– B’RFBW_TRFBW: the IAB RF Bandwidths located at the top of the supported frequency range in the upper operating band and at the lowest possible simultaneous frequency position, within the maximum Radio Bandwidth, in the lower operating band.
NOTE: BRFBW_T’RFBW = B’RFBW_TRFBW = BRFBW_TRFBW when the declared maximum Radio Bandwidth (see clause 4.6) spans both operating bands. BRFBW_TRFBW means the IAB RF Bandwidths are located at the bottom of the supported frequency range in the lower operating band and at the top of the supported frequency range in the upper operating band.
Occupied bandwidth test in the present document are performed with the aggregated IAB channel bandwidth and sub-block bandwidths located at the bottom, middle and top of the supported frequency range in the operating band. These are denoted as BBW Channel CA(bottom), MBW Channel CA (middle) and TBW Channel CA (top) for contiguous spectrum operation.
Unless otherwise stated, the test for contiguous spectrum operation shall be performed at BBW Channel CA, MBW Channel CA and TBW Channel CA defined as following:
– BBW Channel CA: aggregated IAB channel bandwidth located at the bottom of the supported frequency range in each operating band;
– MBW Channel CA: aggregated IAB channel bandwidth located close in the middle of the supported frequency range in each operating band;
– TBW Channel CA: aggregated IAB channel bandwidth located at the top of the supported frequency range in each operating band.
When a test is performed by a test laboratory, the position of B, M and T for single carrier, BRFBW, MRFBW and TRFBW for single band operation, BBW Channel CA, MBW Channel CA and TBW Channel CA for contiguous spectrum operation in the operating band, the position of BRFBW_T’RFBW and B’RFBW_TRFBW in the supported operating band combinations shall be specified by the laboratory. The laboratory may consult with operators, the manufacturer or other bodies.
4.9.2 Test models
4.9.2.1 General
The following clauses will describe the test models needed for IAB type 2-O. Note the IAB FR1 test models described in TS 38.176-1 [3] are also applicable for IAB type 1-O conformance testing.
4.9.2.2 FR2 test models for IAB-DU
FR2 test model in clause 4.9.2.2 in TS 38.141-2 [6] applies to IAB-DU as below:
NR-FR2-TM1.1 applies to IAB-DU-FR2-TM1.1
NR-FR2-TM2 applies to IAB-DU-FR2-TM2
NR-FR2-TM2a applies to IAB-DU-FR2-TM2a
NR-FR2-TM3.1 applies to IAB-DU-FR2-TM3.1
NR-FR2-TM3.1a applies to IAB-DU-FR2-TM3.1a
4.9.2.3 FR2 test models for IAB-MT
The set-up of physical channels for transmitter tests shall be according to one of the test models (IAB-MT-FR2-TM) below. A reference to the applicable test model is made within each test.
The following general parameters are used by all NR test models:
– Duration is 2 radio frames for TDD (20 ms)
– The slots are numbered 0 to 10×2µ – 1 where µ is the numerology corresponding to the subcarrier spacing
– NRB is the maximum transmission bandwidth configuration seen in table 5.3.2-2 in TS 38.174 [2].
– Normal CP
– Virtual resource blocks of localized type
For FR2 TDD, IAB-MT test models are derived based on the uplink/downlink configuration as shown in the table 4.9.2.3-1 using information element TDD-UL-DL-ConfigCommon as defined in TS 38.331 [z].
Table 4.9.2.3-1: Configurations of TDD for IAB-MT type 2-O test models
|
Field name |
Value |
|
|
referenceSubcarrierSpacing (kHz) |
60 |
120 |
|
Periodicity (ms) for dl-UL-TransmissionPeriodicity |
1.25 |
1.25 |
|
nrofDownlinkSlots |
3 |
7 |
|
nrofDownlinkSymbols |
10 |
6 |
|
nrofUplinkSlots |
1 |
2 |
|
nrofUplinkSymbols |
2 |
4 |
Common physical channel parameters for all FR2 test models are specified in table 4.9.2.3-2 and table 4.9.2.3-3 for PUSCH. Specific physical channel parameters for FR2 test models are described in clauses 4.9.2.3.1 to 4.9.2.3.3.
Table 4.9.2.3-2: Common physical channel parameters for IAB-MT type 2-O PUSCH
|
Parameter |
Value |
|
mapping type |
PUSCH mapping type A |
|
dmrs-TypeA-Position for the first DM-RS symbol |
‘pos2’ |
|
dmrs-AdditionalPosition for additional DM-RS symbol(s) |
‘pos0’ |
|
dmrs-Type for comb pattern |
Configuration type 1 |
|
maxLength |
1 |
|
Ratio of PUSCH EPRE to DM-RS EPRE |
0 dB |
|
PTRS configuration and density |
LPT-RS = 4 KPT-RS = 2 |
|
Ratio of PT-RS EPRE to DM-RS EPRE |
0 dB |
Table 4.9.2.3-3: Common physical channel parameters for PUSCH by RNTI for IAB-MT type 2-O test models
|
Parameter |
Value |
|
PUSCH |
|
4.9.2.3.1 FR2 test model 1.1 (IAB-MT-FR2-TM1.1)
This model shall be used for tests on:
– Radiated transmit power
– IAB output power
– Transmit ON/OFF power
– Unwanted emissions
– Occupied bandwidth
– ACLR
– Operating band unwanted emissions
– Transmitter spurious emissions
– Receiver spurious emissions
Common physical channel parameters are defined in clause 4.9.2.3. Specific physical channel parameters for IAB-MT-FR2-TM1.1 are defined in table 4.9.2.3.1-1.
Table 4.9.2.3.1-1: Specific physical channel parameters of IAB-MT-FR2-TM1.1
|
Parameter |
Value |
|
# of PRBs PUSCH |
NRB |
|
Modulation PUSCH |
QPSK |
4.9.2.3.2 FR2 test model 2 (IAB-MT-FR2-TM2)
This model shall be used for tests on:
– Total power dynamic range (at lower PSD TX power limit at min power)
– EVM of single PRB allocation (at lower PSD TX power limit at min power)
– Frequency error (at lower PSD TX power limit at min power)
Common physical channel parameters are defined in clause 4.9.2.3. Specific physical channel parameters for IAB-MT-FR2-TM2 are defined in table 4.9.2.3.2-1 for 64QAM. For 16QAM and QPSK, specific physical channel parameters for IAB-MT-FR2-TM2 are defined in table 4.9.2.3.2-1 with 64QAM PUSCH PRB replaced with selected modulation order PUSCH PRB according to the corresponding test procedure.
Table 4.9.2.3.2-1: Specific physical channel parameters of IAB-MT-FR2-TM2
|
Parameter |
Value |
||||||||||||
|
# of 64QAM PUSCH PRBs |
1 |
||||||||||||
|
Level of boosting (dB) |
0 |
||||||||||||
|
Location of 64QAM PRB |
|
||||||||||||
|
# of PUSCH PRBs which are not allocated |
4.9.2.3.2a FR2 test model 2a (IAB-MT-FR2-TM2a)
This model shall be used for tests on:
– Total power dynamic range (at lower PSD TX power limit at min power)
– EVM of single PRB allocation (at lower PSD TX power limit at min power)
– Frequency error (at lower PSD TX power limit at min power)
Common physical channel parameters are defined in clause 4.9.2.3. Specific physical channel parameters for IAB-MT-FR2-TM2a are defined in table 4.9.2.3.2-1 with all 64QAM PUSCH PRBs replaced by 256QAM PUSCH PRBs.
4.9.2.3.3 FR2 test model 3.1 (IAB-MT-FR2-TM3.1)
This model shall be used for tests on:
– Output power dynamics
– Total power dynamic range (upper TX PSD power limit at max power with all 64QAM PRBs allocated)
– Transmitted signal quality
– Frequency error (at max power)
– EVM for modulation (at max power)
Common physical channel parameters are defined in clause 4.9.2.3. Specific physical channel parameters for IAB-MT-FR2-TM3.1 are defined in table 4.9.2.3.1-1 with all QPSK PUSCH PRBs replaced with selected modulation order PUSCH PRBs according to the corresponding test procedure.
4.9.2.3.4 FR2 test model 3.1a (IAB-MT-FR2-TM3.1a)
This model shall be used for tests on:
– Output power dynamics
– Total power dynamic range (upper TX PSD power limit at max power with all 256QAM PRBs allocated)
– Transmitted signal quality
– Frequency error (at max power)
– EVM for 256QAM modulation (at max power)
Common physical channel parameters are defined in clause 4.9.2.3. Specific physical channel parameters for IAB-MT-FR2-TM3.1a shall be defined in table 4.9.2.3.1-1 with all QPSK PUSCH PRBs replaced by 256QAM.
4.9.2.3 Data content of physical channels and signals for IAB-MT-FR2-TM
Randomisation of the data content is obtained by utilizing a PN sequence generator and the length-31 Gold sequence scrambling of TS 38.211 [7], clause 5.2.1 which is invoked by all physical channels prior to modulation and mapping to the RE grid.
Initialization of the scrambler and RE-mappers as defined in TS 38.211 [7] use the following additional parameters:
–
– q = 0 (single code word)
– Rank 1, single layer
4.9.2.3.1 PUSCH
– Generate the required amount of bits from the output of the PN23 sequence generator [28]. The PN sequence generator is initialized with a starting seed of "all ones" in the first allocated slot of each frame. The PN sequence is continuous over the slot boundaries.
– Perform user specific scrambling according to TS 38.211 [7], clause 6.3.1.1.
–
– Perform modulation of the scrambled bits with the modulation scheme defined for each user according to TS 38.211 [7], clause 6.3.1.3.
– Perform mapping of the complex-valued symbols to layer according to TS 38.211 [7], clause 6.3.1.3.
– Perform PDSCH mapping type A according to TS 38.211 [7].
– DM-RS sequence generation according to TS 38.211 [7], clause 6.4.1.1.1 where l is the OFDM symbol number within the slot with symbols indicated by table 4.9.2.2-3.
–
–
– DM-RS mapping according to TS 38.211 [7], clause 6.4.1.1.3 with parameters listed in table 4.9.2.2-3.
– For NR-IAB-MT-FR2-TM PT-RS sequence generation according to TS 38.211 [7], clause 6.4.1.2.1, with parameters listed in table 4.9.2.2-3.
– For NR-IAB-MT-FR2-TM PT-RS mapping according to TS 38.211 [7], clause 6.4.1.2.2, with parameters listed in table 4.9.2.2-3.