9.2.5 TDD-TDD inter-frequency RSTD Accuracy

37.571-13GPPPart 1: Conformance test specificationRelease 16TSUser Equipment (UE) conformance specification for UE positioning

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

9.2.5.1 Test purpose

To verify that the Reference Signal Time Difference (RSTD) of TDD-TDD inter-frequency measurement accuracy is within the specified limit for all bands in AWGN channels

9.2.5.2 Test applicability

This test applies to all types of E-UTRA TDD UE release 10 and forward that support inter-frequency RSTD measurements except UE Category 1bis.

9.2.5.3 Minimum conformance requirements

This RSTD measurement is used for UE positioning purposes.

The accuracy of TDD-TDD inter-frequency RSTD measurement shall meet the requirement defined in the Table 9.2.4.3-1 without DRX as well as for all the DRX cycles specified in TS 36.331 [22].

The accuracy requirements in Table 9.2.4.3-1 are valid under the following conditions:

Conditions defined in TS 36.101 [2] Section 7.3 for reference sensitivity are fulfilled.

PRP 1,2|_dBm according to clause E.3 for a corresponding Band

There are no measurement gaps overlapping with the PRS subframes in cells belonging to the serving carrier frequency.

The parameter expectedRSTDUncertainty signalled over LPP by E-SMLC as defined in TS 36.355 [4] is less than 5 µs.

The normative reference for this requirement is TS 36.133 [23] clause 9.1.10.2 and A.9.8.4.

9.2.5.4 Test description

9.2.5.4.1 Initial conditions

Test Environment: Normal; as defined in TS 36.508 [18] clause 4.1.

Frequencies to be tested: Mid Range, as defined in TS 36.508 [18] clause 4.3.1.2.

Channel bandwidth to be tested: 1.4 MHz (Test 1) and 10 MHz (Test 2). In the case that 1.4 MHz channel bandwidth is not defined for the operating band under test, as defined in TS 36.101 [2] clause 5.6.1, then this part of the test shall be omitted.

1. Connect the SS and AWGN noise sources to the UE antenna connector or antenna connectors as shown in Annex A, Figure A.3a for 4RX capable UE without any 2RX bands. Otherwise use Annex A figure A.3.

2. The general test parameter settings are set up according to Table 9.2.5.4.1-1.

3. Propagation conditions are set according to clause 4.7.2.1.

4. Message contents are defined in clause 9.2.5.4.3.

5. Two cells are on the different carrier frequencies. Cell 1 is the serving cell and OTDOA assistance data reference cell; Cell 2 is the neighbour cell. The assistance data neighbour cell list includes in total 15 cells, where 14 of the cells are not simulated (dummy cells; as defined in 3GPP TS 37.571‑5 [20], clause 7.2.2).

6. The true RSTD (which is the receive time difference for frame 0 between the two cells as seen at the UE antenna connector) is set to 92 Ts (about 3 s) between neighbour cell 2 and serving cell 1 for Test 1 and -92 Ts (about -3 s) for Test 2.

Note that the related expectedRSTD values to be signalled over LPP are defined in Table 9.2.5.4-1.

7. The gap pattern configuration # 0 as defined in Table 8.1.2.1-1 in 3GPP TS 36.133 [23] is configured and does not overlap with PRS subframes of Cell 1.

Table 9.2.5.4.1-1: General Test Parameters for inter-frequency RSTD Tests for E-UTRAN TDD-TDD

Parameter	Unit	Value		Comment
Parameter	Unit	Test 1	Test 2	Comment
PCFICH/PDCCH/PHICH parameters		R.14 TDD	R.6 TDD	As specified in TS 36.521-3 [25] clause A.2.2.
OCNG Patterns defined in TS 36.521-3 [25] clause D.2		OP.4 TDD	OP.2 TDD	OCNG shall be used such that both cells are fully allocated and a constant total transmitted power spectral density is achieved for all OFDM symbols (other than those in the PRS subframes).
Reference cell		Cell 1		Cell 1 on RF channel number 1
Neighbour cell		Cell 2		Cell 2 on RF channel number 2
E-UTRA RF Channel Number		1,2		Two TDD carrier frequencies are used.
Channel Bandwidth (BW_channel)	MHz	1.4	10
PRS Bandwidth^{Note 2}	RB	6	50
GapOffset		34	13	For Cell 1
Gap Pattern ID		0		For Cell 1
Special subframe configuration		6		As specified in table 4.2-1 in TS 36.211 [26]. The same configuration in both cells.
Uplink-downlink configuration		3	1	As specified in table 4.2-2 in TS 36.211 [26] and table 9.1.2.3-2. The same configuration in both cells.
PRS configuration Index ^{Note 2}		Cell 1: 15 Cell 2: 35	Cell 1: 4 Cell 2: 14	As defined in 3GPP TS 36.211 [26]
PRS subframe offset		20	10	For Cell 2
Number of consecutive positioning downlink subframes ^{Note 2}		6	1	As defined in 3GPP TS 36.211 [26]
prs-MutingInfo^{Note 2}		Cell 1:‘11110000’ Cell 2:‘11110000’		See section 6.5.1.2 in 3GPP TS 36.355 [4] for more information
Cell ID^{Note 2}		Cell 1: 0 Cell 2: 1
Expected RSTD^{Note 1}	μs	Cell 2: 1 Other neighbour cells: randomly between -3 and 3		The expected RSTD is what is expected at the receiver. The corresponding parameter in the OTDOA assistance data specified in TS 36.355 [4] is the expectedRSTD indicator
Expected RSTD uncertainty for all neighbour cells^{Note 1}	μs	5		The corresponding parameter in the OTDOA assistance data specified in TS 36.355 [4] is the expectedRSTD-Uncertainty index
CP length^{Note 2}		Normal
DRX		OFF
Radio frame receive time offset between the cells at the UE antenna connector ^{Note 3}	μs	Cell 2 to Cell 1: 3	Cell 2 to Cell 1: -3	PRS are transmitted from synchronous cells
Number of cells provided in OTDOA assistance data		16		The list includes the reference cell (received in OTDOA-ReferenceCellInfo [4]) on RF channel 1 and 15 other cells on RF channel 2, all received in OTDOA-ProvideAssistanceData [4].
^{Note 4}	ms	5120		Derived according to the RSTD measurement requirements specified in Section 8.1.2.6.3 in TS 36.133 [23].
NOTE 1: Parameters “Expected RSTD” and “Expected RSTD uncertainty for all neighbour cells” are not settable parameters. These are parameters signalled in LPP only. For the values to be used in LPP see Table 9.2.5.4.3-4 and TS 37.571-5 [20], clause 7.2.2. NOTE 2: Parameters “PRS Bandwidth”, “PRS configuration index”, “Number of consecutive positioning downlink subframes”, “prs-MutingInfo”, “Cell ID” and “CP length” are settable parameters and also parameters signalled in LPP. For all the values to be used in LPP see Table 9.2.5.4.3-4 and TS 37.571-5 [20], clause 7.2.2. NOTE 3: The parameter “Radio frame receive time offset between the cells at the UE antenna connector” is not a settable parameter but is used to set the “true RSTD” values in step 6 of clause 9.2.5.4.1. NOTE 4: The parameter “” is not a settable parameter but is used to set the LPP “time” value in Table 9.2.5.4.3-3. The value of the LPP time IE is set to + T ms, where T = 150 ms, giving a value of 5270 ms. This is rounded up to the next allowed LPP value of 6 seconds.

9.2.5.4.2 Test procedure

The test consists of a set-up period and a measurement period. Cell 1 and Cell 2 are both active during the complete test. The beginning of the measurement period shall be aligned with the first PRS positioning subframe of a positioning occasion in the reference cell.

NOTE: The information on when PRS is muted is conveyed to the UE using PRS muting information in the OTDOA assistance data.

The OTDOA-RequestLocationInformation message and the OTDOA assistance data as defined in clause 9.2.5.4.3 shall be provided to the UE during the set-up period. The last TTI containing the OTDOA-RequestLocationInformation message shall be provided to the UE ΔT ms before the start of the measurement period, where ΔT = 150 ms is the maximum processing time of the OTDOA-RequestLocationInformation message and the OTDOA assistance data in the UE.

1. Ensure that the UE is in state Generic RB Established State 3A-RF according to 3GPP TS 36.508 [18] clause 7.2A.3.

2. The SS shall send a RESET UE POSITIONING STORED INFORMATION message.

3. Set the parameters according to Table 9.2.5.5-1 as appropriate. Propagation conditions are set according to clause 4.7.2.1.

4. The SS shall transmit an RRCConnectionReconfiguration message with the measurement gap configuration.

5. The UE shall transmit RRCConnectionReconfigurationComplete message.

5a. The SS shall transmit an LPP REQUEST CAPABILITIES message.

5b. The UE shall transmit an LPP PROVIDE CAPABILITIES message indicating the OTDOA capabilities supported by the UE in the OTDOA-ProvideCapabilities IE.

6. The SS shall send a LPP PROVIDE ASSISTANCE DATA message, including the OTDOA‑ProvideAssistanceData IE. If the UE message at step 5b includes the ackRequested IE set to TRUE, then the SS shall send an acknowledgment in the LPP PROVIDE ASSISTANCE DATA message.

7. The SS shall send a LPP REQUEST LOCATION INFORMATION message, including the OTDOA‑RequestLocationInformation IE such that the UE receives the message T ms before the start of the measurement period, where T = 150 ms.

8. The UE shall transmit a LPP PROVIDE LOCATION INFORMATION message, including the OTDOA‑ProvideLocationInformation IE.

9. If the UE message at step 8 includes the ackRequested IE set to TRUE, the SS shall send a LPP acknowledgement message.

10. The SS shall check the rstd value for Cell 2 in the OTDOA-SignalMeasurementInformation IE according to Table 9.2.5.5-2.

11. Repeat step 2-10 until the confidence level according to Annex D is achieved.

12. Repeat step 1-11 for each sub-test in Table 9.2.5.5-1 as appropriate.

9.2.5.4.3 Message contents

Table 9.2.5.4.3-1: RESET UE POSITIONING STORED INFORMATION

Derivation Path: 36.509 [11] clause 6.9
Information Element	Value/remark	Comment	Condition
UE Positioning Technology	0 0 0 0 0 0 0 1	OTDOA

Table 9.2.5.4.3-2: MeasGapConfig-GP1: TDD-TDD inter-frequency RSTD Accuracy

Derivation Path: TS 36.508 [18] clause 4.6.6, Table 4.6.6-1A: MeasGapConfig-GP1
Information Element	Value/remark	Comment	Condition
MeasGapConfig-GP1 ::= CHOICE {
setup SEQUENCE {
gapOffset CHOICE {
gp0	34 (Test 1) 13 (Test 2)	TGRP = 40 ms
}
}
}

Table 9.2.5.4.3-2a: LPP Request Capabilities

Information Element	Value/remark
otdoa‑RequestCapabilities	TRUE

Table 9.2.5.4.3-3: LPP RequestLocationInformation

Derivation Path: 36.355 clause 6.2
Information Element	Value/remark	Comment	Condition
LPP-Message ::= SEQUENCE {
transactionID SEQUENCE {
initiator	locationServer
transactionNumber	1
}
endTransaction	FALSE
sequenceNumber	Not present
acknowledgement	Not present
lpp-MessageBody CHOICE {
c1 CHOICE {
requestLocationInformation SEQUENCE {
criticalExtensions CHOICE {
c1 CHOICE {
requestLocationInformation-r9 SEQUENCE {
commonIEsRequestLocationInformation SEQUENCE {
locationInformationType	locationMeasurementsRequired
triggeredReporting	Not present
periodicalReporting	Not present
additionalInformation	onlyReturnInformationRequested
qos SEQUENCE {
horizontalAccuracy	Not present
verticalCoordinateRequest	FALSE
verticalAccuracy	Not present
responseTime SEQUENCE {
time	6	See Note 4 of Table 9.2.5.4.1-1
responseTimeEarlyFix-r12	Not present		Rel-12 onwards
}
velocityRequest	FALSE
}
environment	Not present
locationCoordinateTypes	Not present
velocityTypes	Not present
}
a-gnss-RequestLocationInformation	Not present
otdoa-RequestLocationInformation SEQUENCE {
assistanceAvailability	FALSE
}
ecid-RequestLocationInformation	Not present
epdu-RequestLocationInformation	Not Present
}
}
}
}
}
}
}

Table 9.2.5.4.3-4: LPP ProvideAssistanceData

Derivation Path: 36.355 clause 6.2
Information Element	Value/remark	Comment	Condition
LPP-Message ::= SEQUENCE {
transactionID SEQUENCE {
Initiator	locationServer
transactionNumber	(0..255)
}
endTransaction	TRUE
sequenceNumber	Not present
acknowledgement	Not present
lpp-MessageBody CHOICE {
c1 CHOICE {
provideAssistanceData SEQUENCE {
criticalExtensions CHOICE {
c1 CHOICE {
provideAssistanceData-r9 SEQUENCE {
commonIEsProvideAssistanceData	Not present
a-gnss-ProvideAssistanceData	Not present
otdoa-ProvideAssistanceData SEQUENCE {
otdoa-ReferenceCellInfo	As defined in TS 37.571‑5 [20], clause 7.2.2.
otdoa-NeighbourCellInfo	As defined in TS 37.571‑5 [20], clause7.2.2.
otdoa-Error	Not present
}
epdu-ProvideAssistanceData	Not present
}
}
}
}
}
}

Table 9.2.5.4.3-5: LPP ProvideLocation Information

Derivation Path: 36.355 clause 6.2
Information Element	Value/remark	Comment	Condition
LPP-Message ::= SEQUENCE {
transactionID SEQUENCE {
initiator	locationServer
transactionNumber	1
}
endTransaction	TRUE
sequenceNumber	(0..255)
acknowledgement
lpp-MessageBody CHOICE {
c1 CHOICE {
provideLocationInformation SEQUENCE {
criticalExtensions CHOICE {
c1 CHOICE {
provideLocationInformation-r9 SEQUENCE {
commonIEsProvideLocationInformation	Not present.
a-gnss-ProvideLocationInformation	Not present
otdoa-ProvideLocationInformation SEQUENCE {
otdoaSignalMeasurementInformation SEQUENCE {
systemFrameNumber
physCellIdRef	Cell 1
cellGlobalIdRef
earfcnRef
referenceQuality
neighbourMeasurementList SEQUENCE (SIZE(1)) {
physCellIdNeighbor	Cell 2
cellGlobalIdNeighbour
earfcnNeighbour	RF channel 2
rstd	Set according to Table 9.2.5.5-2 for each specific test
rstd-Quality
}
}
otdoa-Error	May be present with error reason ‘undefined’ or ‘attemptedButUnableToMeasureSomeNeighbourCells’
}
ecid-ProvideLocationInformation	Not present
epdu-ProvideLocationInformation	Not present
}
}
}
}
}
}

Table 9.2.5.4.3-6: CQI-ReportConfig-DEFAULT: TDD-TDD inter-frequency RSTD Accuracy

Derivation Path: TS 36.508 [18] clause 4.6.3, Table 4.6.3-2 CQI-ReportConfig-DEFAULT
Information Element	Value/remark	Comment	Condition
CQI-ReportConfig-DEFAULT ::= SEQUENCE {
cqi-ReportModeAperiodic	rm30	This IE should be omitted for Test 1
nomPDSCH-RS-EPRE-Offset	0
cqi-ReportPeriodic CHOICE {
release	NULL
}

9.2.5.5 Test requirement

Table 9.2.5.5-1 defines the primary level settings including test tolerances for all tests.

The RSTD TDD-TDD inter frequency measurement accuracy test shall meet the reported values in Table 9.2.5.5-2.

Table 9.2.5.5-1: Cell Specific Test Parameters for inter frequency RSTD Tests for E-UTRAN TDD-TDD

Parameter	Unit	Test 1		Test 2
Parameter	Unit	Cell 1	Cell 2	Cell 1	Cell 2
E-UTRA RF Channel Number		1	2	1	2
PBCH_RA	dB	0
PBCH_RB
PSS_RA
SSS_RA
PCFICH_RB
PHICH_RA
PHICH_RB
PDCCH_RA
PDCCH_RB
OCNG_RA^{Note 1}
OCNG_RB^{Note 1}
PRS_RA	dB	-2.7	0.3	-2.7	0.3
^{Note 2}	dBm/15 kHz	-98
PRS	dB	-5.7	-12.7	-5.7	-12.7
PRS ^{Note 3}	dB	-5.7	-12.7	-5.7	-12.7
Io ^{Note 3}	dBm/1.08 MHz	-79.24	-79.39	N/A	N/A
Io ^{Note 3}	dBm/9 MHz	N/A	N/A	-70.03	-70.18
PRP^{Note 3}	dBm/15kHz	-103.7	-110.7	-103.7	-110.7
^{Note 3}	dB	-3	-13	-3	-13
RSRP^{Note 3}	dBm/15kHz	-101	-111	-101	-111
Propagation condition		AWGN
Note 1: OCNG shall be used such that both cells are fully allocated and a constant total transmitted power spectral density is achieved for all OFDM symbols (other than those in the PRS subframes). Note 2: Interference from other cells and noise sources not specified in the test is assumed to be constant over subcarriers and time and shall be modelled as AWGN of appropriate power for to be fulfilled. Note 3: , PRS , Io, RSRP and PRP levels have been derived from other parameters for information purposes. They are not settable parameters themselves. Io values are derived in the case that there is no PBCH, PSS or SSS in the OFDM symbols carrying PRS.

Table 9.2.5.5-2: RSTD TDD inter-frequency accuracy requirements for the reported values

	Test 1	Test 2
Lowest reported value	RSTD_6424	RSTD_6253
Highest reported value	RSTD_6470	RSTD_6275

For the overall test to pass, the ratio of successful reported values in each sub-test shall be more than 90% with a confidence level of 95%. In the case that 1.4 MHz channel bandwidth is not defined for the operating band under test then Test 1 shall be omitted.