9.7 TDD RSTD Intra-Frequency Measurements for NB-IOT

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

9.7.1 TDD Intra Frequency RSTD Measurement Accuracy for NB-IOT Inband Mode in normal coverage

9.7.1.1 Test purpose

To verify that the RSTD TDD intra-frequency measurement accuracy is within the specified limits for NB-IOT Mode in normal coverage.

9.7.1.2 Test applicability

This test applies to all types of NB-IoT TDD UE release 15 and forward that supports UE-assisted OTDOA.

9.7.1.3 Minimum conformance requirements

The UE shall follow the procedure for RRC_IDLE state positioning measurement as defined in TS 36.305 [41] section 7.1.3.

When the physical layer cell identities of the neighbour cells together with the OTDOA assistance data have been provided and the UE has entered the RRC_IDLE state, the UE shall be able to detect and measure intra-frequency RSTD, specified in TS 36.214 [6], for at least n = 16 cells, including the reference cell, on the same carrier frequency f1 as that of the reference cell within ms as given below:

,

where

is the total time for detecting and measuring at least n cells;

is the cell-specific positioning subframe configuration period as defined in TS 36.355 [4] if Part B subframe configuration is provided; otherwise if only Part A subframe configuration is provided, the equals to the length of the subframe pattern,

is the number of NPRS positioning occasions as defined in Table 9.7.1.3-1,

= ms is the measurement time for a single NPRS positioning occasion which includes the sampling time and the processing time;

is the cell-specific number of NPRS subframes within a NPRS occasion as defined in TS 36.355 [4] if Part B subframe configuration is provided; if only Part A subframe configuration is provided, the NPRS occasion length is 10 ms,

is the minimum number of NPRS subframes per cell measurement as defined in Table 9.7.1.3-2.

, , and , are the parameters of the same cell, for which is the largest among all the measured cells.

Table 9.7.1.3-1: Number of NPRS positioning occasions within

Positioning subframe configuration period

Number of NPRS positioning occasions

f1 Note1

f1 and f2 Note2

160 ms

16*

32*

>160 ms

8*

16*

Note 1: When only intra-frequency RSTD measurements are performed over cells belonging to the serving carrier frequency f1.

Note 2: When intra-frequency RSTD and inter-frequency RSTD measurements are performed over cells belonging to the serving carrier frequency f1 and one inter-frequency carrier frequency f2, respectively.

The UE physical layer shall be capable of reporting RSTD for the reference cell and all the neighbour cells i out of at least (n-1) neighbour cells within provided:

≥-6 dB for all Frequency Bands for the reference cell,

≥-13 dB for all Frequency Bands for neighbour cell i,

and conditions apply for all subframes of at least NPRS positioning occasions,

NPRP 1,2|dBm according to Annex E.5 for a corresponding Band

is defined as the ratio of the average received energy per PRS RE during the useful part of the symbol to the average received power spectral density of the total noise and interference for this RE, where the ratio is measured over all REs which carry NPRS.

The time starts from the point when the UE has received both the OTDOA-RequestLocationInformation message and the OTDOA assistance data in the OTDOA-ProvideAssistanceData message as specified in TS 36.355 [4], and the message and data have been delivered to the physical layer of the UE and the UE has entered the RRC_IDLE state.

The accuracy requirements in Table 9.7.1.3-2 are valid under the following conditions:

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

NPRP 1,2|dBm according to Annex E.5 for a corresponding Band

There are no measurement gaps overlapping with the NPRS subframes of the measured serving cell.

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

Table 9.7.1.3-2: Intra RSTD measurement accuracy for normal coverage

Accuracy

Conditions

NPRS Ês/Iot

UE NPRS measurement

bandwidth on the reference cell and the measured neighbour cell i Note 3

Minimum number of available measurement subframes among the reference cell and the measured neighbour cell i, NNPRS_total Note 6

Io Note 4 range

E-UTRA operating band groups Note 5

Minimum
Io Note 1

Maximum
Io

Ts Note 2

dB

RB

dBm/15kHz

dBm/BWChannel

±20

(NPRS Ês/Iot)ref ≥-6dB

and

(NPRS Ês/Iot)i ≥-13dB

1

320

NTDD_G

-118

-70

NOTE 1: This minimum Io condition is expressed as the average Io per RE over all REs in an OFDM symbol.

NOTE 2: Ts is the basic timing unit defined in TS 36.211 [26].

NOTE 3: The serving cell, the reference cell, and the measured neighbour cell i are on the same carrier frequency.

NOTE 4: The Io is defined in NPRS positioning subframes. The same Io range applies to NPRS and non-NPRS symbols. Io levels are different in NPRS and non-NPRS symbols within the same subframe.

NOTE 5: E-UTRA operating band groups are as defined in Section 4.11.1.

NOTE 6: NNPRS_total can be in one or more NPRS positioning occasions.

The normative reference for this requirement is TS 36.133 [23] clauses 4.8.1, 9.1.22.10, A.3.23.2 and A.9.8.32.

9.7.1.4 Test description

9.7.1.4.1 Initial conditions

Test Environment: Normal; as defined in TS 36.508 [18] clause 8.1.1.

Frequencies to be tested: Mid Range, as defined in TS 36.508 [18] clause 8.1.3.1.1.

Channel bandwidth to be tested: 10 MHz.

1. Connect the SS and AWGN noise sources to the UE antenna connector or antenna connectors as shown in Annex A, Figure A.3 but using only the main TX/RX antenna.

2. The general test parameter settings are set up according to Table 9.7.1.4.1-1.

3. Propagation conditions are set according to clause 4.7.2.1.

4. Message contents are defined in clause 9.7.1.4.3.

5. All cells are on the same carrier frequency. nCell 1 is the serving cell and OTDOA assistance data reference cell; nCell 2 is the neighbour cell. eCell 1 and eCell 2 are the LTE donor cells to nCell 1 and nCell 2, respectively. The assistance data neighbour cell list includes in total 15 cells, where 14 of the cells are not simulated (dummy cells; as defined in TS 37.571‑5 [20], clause 7.2.2).

6. The true RSTD (which is the receive time difference for frame 0 between nCell 2 and nCell 1 as seen at the UE antenna connector) is set to 92 Ts (about 3 s). Note that the related expectedRSTD values to be signalled over LPP are defined in Table 9.7.1.4-1.

Table 9.7.1.4-1: General test parameters

Parameter

Unit

Value

Comment

NB-IoT operational mode

Inband

Reference cell

nCell 1

Neighbor cells

nCell 2, eCell 2 and eCell 1

NPDCCH parameters

R.26 NB-TDD

Specified in TS 36.133 [23] section A.3.1.6.1

nprsID

Test1: (nprsID of Cell 1 – nprsID of Cell 2)mod6=1

As defined in TS 36.355 [4]

nprs-period

ms

1280

As defined in TS 36.355 [4]

nprs-startSF

sf0

Subframe offset of the NPRS positioning occasion as defined in TS 36.355 [4]

Number of consecutive downlink positioning subframes

nprs-NumSF

640

As defined in TS 36.355 [4]

NPRS muting info

nCell 1: ‘11110000’

nCell 2: ‘11110000’

Corresponds to nprs-MutingInfoB defined in TS 36.355 [4]

PartA Configuration:

subframePattern10-TDD

‘01100011’

Corresponds to subframePattern10-TDD-r15 defined in TS 36.355 [4]

nprsSequenceInfo

BWchannel 10MHz: 130

Corresponds to nprsSequenceInfo defined in TS 36.355 [4]

CP length

Normal

NPRACH Configuration

NPRACH.R-2

Refer to TS 36.133 [23] section A.3.18

DRX cycle length

1.28

The value shall be used for all cells in the test.

Expected RSTD

μs

nCell 2: 3

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

μs

5

The corresponding parameter in the OTDOA assistance data specified in TS 36.355 [4] is the expectedRSTD-Uncertainty index

Number of cells provided in OTDOA assistance data

16

Including the reference cell

Special subframe configuration

6

As specified in table 4.2-1 in TS 36.211 [26]

Uplink-downlink configuration

2

As specified in table 4.2-2 in TS 36.211 [26]

Measurement period

s

11.52

Derived according to the RSTD measurement period in clause 9.7.1.3

9.7.1.4.2 Test procedure

Same as in clause 9.5.1.4.2.

9.7.1.4.3 Message contents

Same as in clause 9.5.1.4.3.

9.7.1.5 Test requirement

Table 9.7.1.5-1 and 9.7.1.5-2 define the primary level settings including test tolerances for the test.

The RSTD TDD intra-frequency accuracy test shall meet the reported values in Table 9.7.1.5-3.

Table 9.7.1.5-1: Cell Specific Test Parameters for intra frequency RSTD Tests for NB-IOT Cells

Parameter

Unit

Test1

nCell 1

nCell 2

BWchannel

kHz

180

180

PRB location within eCell

eCell 1 BWchannel 10MHz: 30

eCell 2 BWchannel 10MHz: 30

NPBCH_RA

dB

0

0

NPBCH_RB

NPSS_RA

NSSS_RA

NPDCCH_RA

NPDCCH_RB

NPDSCH_RA

NPDSCH_RB

OCNG_RA Note 1

OCNG_RB Note 1

NPRS_RA

dB

0.3

0.3

Note 2

dBm/

15 kHz

-98

-98

NPRS

dB

-5.7

-12.7

NPRS Note 3

dB

-5.7

-12.7

Io Note 3

dBm/

180kHz

-86.89

-86.89

NPRP Note 3

dBm/

15 kHz

-103.7

-110.7

NRSRP Note 3

dBm/ 15 kHz

-104

-111

Note 3

dB

-6

-13

Propagation Condition

AWGN

AWGN

Antenna Configuration

1×1

1×1

Timing offset to nCell 1

us

N/A

3

Note 1: OCNG shall be used such that active cells are fully allocated and a constant total transmitted power spectral density is achieved for all OFDM symbols other than those in the subframes with transmitted NPRS.

Note 2: Interference from other cells and noise sources not specified in the test are assumed to be constant over subcarriers and time and shall be modelled as AWGN of appropriate power for to be fulfilled.

Note 3: If NPRS_RA is not “N/A”, , NPRS , Io, NRSRP and NPRP levels have been derived from other parameters and are given for information purpose. If NPRS_RA is “N/A”, Io and NRSRP levels have been derived from other parameters and are given for information purpose. These are not settable test parameters. Interference conditions shall be applied to all PRS symbols of DL positioning subframes.

Table 9.7.1.5-2: Cell Specific Test Parameters for intra frequency RSTD Tests for E-UTRA Cells

Parameter

Unit

eCell 1

eCell 2

T1

T2

T3

T1

T2

T3

BWchannel

MHz

10

10

NOCNG Pattern defined in TS 36.133 [23] section A.3.2.3.6

NOP.1 TDD

NOP.1 TDD

PBCH_RA

dB

-3

-3

PBCH_RB

dB

PSS_RA

dB

SSS_RA

dB

PDCCH_RA

dB

PDCCH_RB

dB

PDSCH_RA

dB

PDSCH_RB

dB

OCNG_RANote 1

dB

OCNG_RBNote 1

dB

Note2

dBm/15 kHz

-98

-98

Note2

dBm

0

0

0

-7

-7

-7

Propagation Condition

AWGN

AWGN

Antenna Configuration

1×1

1×1

Timing offset to eCell 1

us

3

Note 1: OCNG shall be used such that the Cell is fully allocated and a constant total transmitted power spectral density is achieved for all OFDM symbols.

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 .

Table 9.7.1.5-3: RSTD TDD intra-frequency accuracy requirements for the reported values

Lowest reported value

RSTD_6426

Highest reported value

RSTD_6468

For the overall test to pass, the ratio of successful reported values shall be more than 90% with a confidence level of 95%.

The expected response time is 12 s. The response time is equal to the LPP time IE value. The LPP time IE value is derived from the RSTD reporting delay plus ΔT, where ΔT = 150 ms, giving a value of 11670 ms. This is rounded up to the next allowed LPP value of 12 seconds. The RSTD measurement reporting delay in the test is derived from the following expression, , where =1280 ms, =8, = , =320 ms, =640 ms and =16. All the parameters are specified in clause 9.7.1.3 and Table 9.7.1.3‑1. This gives the total RSTD reporting delay of 11520 ms for the 15 neighbour cells including nCell 2 with respect to the reference cell, nCell 1. This expected response time excludes any delay caused by RRC connection release before the RRC_IDLE mode measurement. This expected response time excludes any delay caused by establishing a signalling connection with the SS (including random access procedure) as defined in TS 36.305 [41] for LPP measurement reporting. The response time is not explicitly evaluated for this test; hence, no test tolerance values need to be applied.

9.7.2 TDD Intra Frequency RSTD Measurement Accuracy for NB-IOT Inband Mode in enhanced coverage

9.7.2.1 Test purpose

To verify that the RSTD TDD intra-frequency measurement accuracy is within the specified limits for NB-IOT Mode in enhanced coverage.

9.7.2.2 Test applicability

This test applies to all types of NB-IoT TDD UE release 15 and forward that supports UE-assisted OTDOA.

9.7.2.3 Minimum conformance requirements

Same as clause 9.7.1.3, replacing Table 9.7.1.3-1 with Table 9.7.2.3-1 and Table 9.7.1.3-2 with Table 9.7.2.3-2.

Table 9.7.2.3-1: Number of NPRS positioning occasions within

Positioning subframe configuration period

Number of NPRS positioning occasions

f1 Note1

f1 and f2 Note2

160 ms

16*

32*

>160 ms

8*

16*

Note 1: When only intra-frequency RSTD measurements are performed over cells belonging to the serving carrier frequency f1.

Note 2: When intra-frequency RSTD and inter-frequency RSTD measurements are performed over cells belonging to the serving carrier frequency f1 and one inter-frequency carrier frequency f2, respectively.

The UE physical layer shall be capable of reporting RSTD for the reference cell and all the neighbour cells i out of at least (n-1) neighbour cells within provided:

≥-15 dB for all Frequency Bands for the reference cell,

≥-15 dB for all Frequency Bands for neighbour cell i,

and conditions apply for all subframes of at least NPRS positioning occasions,

NPRP 1,2|dBm according to Annex E.5 for a corresponding Band

is defined as the ratio of the average received energy per PRS RE during the useful part of the symbol to the average received power spectral density of the total noise and interference for this RE, where the ratio is measured over all REs which carry NPRS.

Table 9.7.2.3-2: Intra RSTD measurement accuracy for normal coverage

Accuracy

Conditions

NPRS Ês/Iot

UE NPRS measurement

bandwidth on the reference cell and the measured neighbour cell i Note 3

Minimum number of available measurement subframes among the reference cell and the measured neighbour cell i, NNPRS_total Note 6

Io Note 4 range

E-UTRA operating band groups Note 5

Minimum
Io Note 1

Maximum
Io

Ts Note 2

dB

RB

dBm/15kHz

dBm/BWChannel

±32

(NPRS Ês/Iot)ref ≥-15dB

and

(NPRS Ês/Iot)i ≥-15dB

1

320

NTDD_G

-118

-70

NOTE 1: This minimum Io condition is expressed as the average Io per RE over all REs in an OFDM symbol.

NOTE 2: Ts is the basic timing unit defined in TS 36.211 [26].

NOTE 3: The serving cell, the reference cell, and the measured neighbour cell i are on the same carrier frequency.

NOTE 4: The Io is defined in NPRS positioning subframes. The same Io range applies to NPRS and non-NPRS symbols. Io levels are different in NPRS and non-NPRS symbols within the same subframe.

NOTE 5: E-UTRA operating band groups are as defined in Section 4.11.1.

NOTE 6: NNPRS_total can be in one or more NPRS positioning occasions.

The normative reference for this requirement is TS 36.133 [23] clauses 4.8.2, 9.1.22.12, A.3.23.2 and A.9.8.34.

9.7.2.4 Test description

9.7.2.4.1 Initial conditions

Test Environment: Normal; as defined in TS 36.508 [18] clause 8.1.1.

Frequencies to be tested: Mid Range, as defined in TS 36.508 [18] clause 8.1.3.1.1.

Channel bandwidth to be tested: 10 MHz.

1. Connect the SS and AWGN noise sources to the UE antenna connector or antenna connectors as shown in Annex A, Figure A.3 but using only the main TX/RX antenna.

2. The general test parameter settings are set up according to Table 9.7.2.4.1-1.

3. Propagation conditions are set according to clause 4.7.2.1.

4. Message contents are defined in clause 9.7.2.4.3.

5. All cells are on the same carrier frequency. nCell 1 is the serving cell and OTDOA assistance data reference cell; nCell 2 is the neighbour cell. eCell 1 and eCell 2 are the LTE donor cells to nCell 1 and nCell 2, respectively. The assistance data neighbour cell list includes in total 15 cells, where 14 of the cells are not simulated (dummy cells; as defined in TS 37.571‑5 [20], clause 7.2.2).

6. The true RSTD (which is the receive time difference for frame 0 between nCell 2 and nCell 1 as seen at the UE antenna connector) is set to 92 Ts (about 3 s). Note that the related expectedRSTD values to be signalled over LPP are defined in Table 9.7.2.4-1.

Table 9.7.2.4-1: General test parameters

Parameter

Unit

Value

Comment

NB-IoT operational mode

Inband

Reference cell

nCell 1

Neighbor cells

nCell 2, eCell 2 and eCell 1

NPDCCH parameters

R.26 NB-TDD

Specified in TS 36.133 [23] section A.3.1.6.1

nprsID

Test1: (nprsID of Cell 1 – nprsID of Cell 2)mod6=1

As defined in TS 36.355 [4]

nprs-period

ms

1280

As defined in TS 36.355 [4]

nprs-startSF

sf0

Subframe offset of the NPRS positioning occasion as defined in TS 36.355 [4]

Number of consecutive downlink positioning subframes

nprs-NumSF

640

As defined in TS 36.355 [4]

NPRS muting info

nCell 1: ‘11110000’

nCell 2: ‘11110000’

Corresponds to nprs-MutingInfoB defined in TS 36.355 [4]

PartA Configuration:

subframePattern10-TDD

‘01100011’

Corresponds to subframePattern10-TDD-r15 defined in TS 36.355 [4]

nprsSequenceInfo

BWchannel 10MHz: 130

Corresponds to nprsSequenceInfo defined in TS 36.355 [4]

CP length

Normal

NPRACH Configuration

NPRACH.R-2

Refer to TS 36.133 [23] section A.3.18

DRX cycle length

1.28

The value shall be used for all cells in the test.

Expected RSTD

μs

nCell 2: 3

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

μs

5

The corresponding parameter in the OTDOA assistance data specified in TS 36.355 [4] is the expectedRSTD-Uncertainty index

Number of cells provided in OTDOA assistance data

16

Including the reference cell

Special subframe configuration

6

As specified in table 4.2-1 in TS 36.211 [26]

Uplink-downlink configuration

2

As specified in table 4.2-2 in TS 36.211 [26]

Measurement period

s

11.52

Derived according to the RSTD measurement period in clause 9.7.2.3

9.7.2.4.2 Test procedure

Same as in clause 9.5.2.4.2.

9.7.2.4.3 Message contents

Same as in clause 9.5.2.4.3.

9.7.2.5 Test requirement

Table 9.7.2.5-1 and 9.7.2.5-2 define the primary level settings including test tolerances for the test.

The RSTD TDD intra-frequency accuracy test shall meet the reported values in Table 9.7.2.5-3.

Table 9.7.2.5-1: Cell Specific Test Parameters for intra frequency RSTD Tests for NB-IOT Cells

Parameter

Unit

Test1

nCell 1

nCell 2

BWchannel

kHz

180

180

PRB location within eCell

eCell 1 BWchannel 10MHz: 30

eCell 2 BWchannel 10MHz: 30

NPBCH_RA

dB

0

0

NPBCH_RB

NPSS_RA

NSSS_RA

NPDCCH_RA

NPDCCH_RB

NPDSCH_RA

NPDSCH_RB

OCNG_RA Note 1

OCNG_RB Note 1

NPRS_RA

dB

0.3

0.3

Note 2

dBm/

15 kHz

-98

-98

NPRS

dB

-14.3

-14.3

NPRS Note 3

dB

-14.3

-14.3

Io Note 3

dBm/

180kHz

-87.14

-87.14

NPRP Note 3

dBm/

15 kHz

-112.7

-112.7

NRSRP Note 3

dBm/ 15 kHz

-113

-113

Note 3

dB

-15

-15

Propagation Condition

AWGN

AWGN

Antenna Configuration

1×1

1×1

Timing offset to nCell 1

us

N/A

3

Note 1: OCNG shall be used such that active cells are fully allocated and a constant total transmitted power spectral density is achieved for all OFDM symbols other than those in the subframes with transmitted NPRS.

Note 2: Interference from other cells and noise sources not specified in the test are assumed to be constant over subcarriers and time and shall be modelled as AWGN of appropriate power for to be fulfilled.

Note 3: If NPRS_RA is not “N/A”, , NPRS , Io, NRSRP and NPRP levels have been derived from other parameters and are given for information purpose. If NPRS_RA is “N/A”, Io and NRSRP levels have been derived from other parameters and are given for information purpose. These are not settable test parameters. Interference conditions shall be applied to all PRS symbols of DL positioning subframes.

Table 9.7.2.5-2: Cell Specific Test Parameters for intra frequency RSTD Tests for E-UTRA Cells

Parameter

Unit

eCell 1

eCell 2

T1

T2

T3

T1

T2

T3

BWchannel

MHz

10

10

NOCNG Pattern defined in TS 36.133 [23] section A.3.2.3.6

NOP.1 TDD

NOP.1 TDD

PBCH_RA

dB

-3

-3

PBCH_RB

dB

PSS_RA

dB

SSS_RA

dB

PDCCH_RA

dB

PDCCH_RB

dB

PDSCH_RA

dB

PDSCH_RB

dB

OCNG_RANote 1

dB

OCNG_RBNote 1

dB

Note2

dBm/15 kHz

-98

-98

Note2

dBm

-9

-9

-9

-9

-9

-9

Propagation Condition

AWGN

AWGN

Antenna Configuration

1×1

1×1

Timing offset to eCell 1

us

3

Note 1: OCNG shall be used such that the Cell is fully allocated and a constant total transmitted power spectral density is achieved for all OFDM symbols.

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 .

Table 9.7.2.5-3: RSTD TDD intra-frequency accuracy requirements for the reported values

Lowest reported value

RSTD_6414

Highest reported value

RSTD_6480

For the overall test to pass, the ratio of successful reported values shall be more than 90% with a confidence level of 95%.

The expected response time is 12 s. The response time is equal to the LPP time IE value. The LPP time IE value is derived from the RSTD reporting delay plus ΔT, where ΔT = 150 ms, giving a value of 11670 ms. This is rounded up to the next allowed LPP value of 12 seconds. The RSTD measurement reporting delay in the test is derived from the following expression, , where =1280 ms, =8, = , =320 ms, =640 ms and =16. All the parameters are specified in clause 9.7.2.3 and Table 9.7.2.3‑1. This gives the total RSTD reporting delay of 11520 ms for the 15 neighbour cells including nCell 2 with respect to the reference cell, nCell 1. This expected response time excludes any delay caused by RRC connection release before the RRC_IDLE mode measurement. This expected response time excludes any delay caused by establishing a signalling connection with the SS (including random access procedure) as defined in TS 36.305 [41] for LPP measurement reporting. The response time is not explicitly evaluated for this test; hence, no test tolerance values need to be applied.

9.7.3 TDD Intra Frequency RSTD Measurement Reporting Delay for NB-IOT Standalone Mode in enhanced coverage

9.7.3.1 Test purpose

To verify that the RSTD TDD intra-frequency measurement reporting delay is within the specified limits for NB-IOT Standalone Mode in enhanced coverage.

9.7.3.2 Test applicability

This test applies to all types of NB-IoT TDD UE release 15 and forward that supports UE-assisted OTDOA.

9.7.3.3 Minimum conformance requirements

The UE shall follow the procedure for RRC_IDLE state positioning measurement as defined in TS 36.305 [41] section 7.1.3.

When the physical layer cell identities of neighbour cells together with the OTDOA assistance data have been provided and the UE has entered the RRC_IDLE state, the UE shall be able to detect and measure intra-frequency RSTD, specified in TS 36.214 [6], for at least n = 16 cells, including the reference cell, on the same carrier frequency f1 as that of the reference cell within ms as given below:

,

where

is the total time for detecting and measuring at least n cells;

is the cell-specific positioning subframe configuration period as defined in TS 36.355 [4] if Part B subframe configuration is provided; otherwise if only Part A subframe configuration is provided, the equals to the length of the subframe pattern,

is the number of NPRS positioning occasions as defined in Table 9.7.3.3-1,

= ms is the measurement time for a single NPRS positioning occasion which includes the sampling time and the processing time;

is the cell-specific number of NPRS subframes within a NPRS occasion as defined in TS 36.355 [4] if Part B subframe configuration is provided; if only Part A subframe configuration is provided, the NPRS occasion length is 10 ms,

is the minimum number of NPRS subframes per cell measurement as defined in Table 9.7.3.3-2.

, , and , are the parameters of the same cell, for which is the largest among all the measured cells.

Table 9.7.3.3-1: Number of NPRS positioning occasions within

Positioning subframe configuration period

Number of NPRS positioning occasions

f1 Note1

f1 and f2 Note2

160 ms

16*

32*

>160 ms

8*

16*

Note 1: When only intra-frequency RSTD measurements are performed over cells belonging to the serving carrier frequency f1.

Note 2: When intra-frequency RSTD and inter-frequency RSTD measurements are performed over cells belonging to the serving carrier frequency f1 and one inter-frequency carrier frequency f2, respectively.

The UE physical layer shall be capable of reporting RSTD for the reference cell and all the neighbour cells i out of at least (n-1) neighbour cells within provided:

≥-15 dB for all Frequency Bands for the reference cell,

≥-15 dB for all Frequency Bands for neighbour cell i,

and conditions apply for all subframes of at least NPRS positioning occasions,

NPRP 1,2|dBm according to Annex E.5 for a corresponding Band

is defined as the ratio of the average received energy per PRS RE during the useful part of the symbol to the average received power spectral density of the total noise and interference for this RE, where the ratio is measured over all REs which carry NPRS.

The time starts from the point when the UE has received both the OTDOA-RequestLocationInformation message and the OTDOA assistance data in the OTDOA-ProvideAssistanceData message as specified in TS 36.355 [4], and the message and data have been delivered to the physical layer of the UE, and the UE has entered the RRC_IDLE state.

After receiving both the OTDOA-RequestLocationInformation message and the OTDOA assistance data in the OTDOA-ProvideAssistanceData message as specified in TS 36.355 [4], the UE shall be sent to RRC IDLE state. The maximum allowed RSTD reporting delay is defined as the time between the point when the UE has entered the RRC_IDLE state, and the point when the UE is ready to transmit the measurement report over the air interface and starts to establish a signalling connection with the MME.

The maximum allowed RSTD reporting delay shall be less than +TRandomAccess_NB-IoT-EC.

The normative reference for this requirement is TS 36.133 [23] clauses 4.8.2, 4.8.2.1, A.3.23.2 and A.4.7.3.

9.7.3.4 Test description

9.7.3.4.1 Initial conditions

Test Environment: Normal; as defined in TS 36.508 [18] clause 8.1.1.

Frequencies to be tested: Mid Range, as defined in TS 36.508 [18] clause 8.1.3.1.1.

Channel bandwidth to be tested: 200 kHz as defined in TS 36.508 [18] clause 8.1.3.1.

1. Connect the SS and AWGN noise sources to the UE antenna connector or antenna connectors as shown in Annex A, Figure A.3 but using only the main TX/RX antenna.

2. The general test parameter settings are set up according to Table 9.7.3.4.1-1.

3. Propagation conditions are set according to clause 4.7.2.1.

4. Message contents are defined in clause 9.7.3.4.3.

5. There are three synchronous cells: nCell 1, nCell 2 and nCell 3. nCell 1 is the reference as well as the serving cell. nCell 2 and nCell 3 are the neighbour cells. All cells are on the same RF channel. The assistance data neighbour cell list includes in total 15 cells, where 13 of the cells are not simulated (dummy cells; as defined in TS 37.571‑5 [20], clause 7.2.2).

6. The true RSTD (which is the receive time difference for frame 0 between nCell 2 and nCell 1 as seen at the UE antenna connector) is set to 31 Ts (about 1 s between neighbour nCell 2 and serving nCell 1; and set to -31 Ts (about -1 s) between neighbour nCell 3 and serving nCell 1

Table 9.7.3.4-1: General test parameters

Parameter

Unit

Value

Comment

NB-IoT operational mode

Standalone

Reference cell

nCell 1

Reference cell is the cell in the OTDOA assistance data with respect to which the RSTD measurement is defined, as specified in TS 36.214 [6] and TS 36.355 [4]. The reference cell is the PCell in this test case.

Neighbor cells

nCell 2 and nCell 3

Cell 2 and Cell 3 appear at random places in the neighbour cell list in the OTDOA assistance data, but Cell 2 always appears in the first half of the list, whilst Cell 3 appears in the second half of the list.

nprsID

(nprsID of Cell 1 – nprsID of Cell 2)mod6=1

and

(nprsID of Cell 1 – nprsID of Cell 3)mod6=2

As defined in TS 36.355 [4]

nprs-period

ms

1280

As defined in TS 36.355 [4]

nprs-startSF

sf0

Subframe offset of the NPRS positioning occasion as defined in TS 36.355 [4]

Number of consecutive downlink positioning subframes

nprs-NumSF

640

As defined in TS 36.355 [4]

NPRS muting info

nCell 1: ‘11110000’

nCell 2: ‘00001111’

nCell 3: ‘11110000’

Corresponds to nprs-MutingInfoB defined in TS 36.355 [4]

Part A Configuration

N/A

NPRS is configured based on Part B but not Part A.

CP length

Normal

NPRACH Configuration

NPRACH.R-2

Refer to A.3.18

DRX cycle length

1.28

The value shall be used for all cells in the test.

Radio frame receive time offset between the cells at the UE antenna connector

μs

nCell 2 to nCell 1: 1

nCell 3 to nCell 1: -1

PRS are transmitted from synchronous cells

Expected RSTD

μs

nCell 2: 3

nCell 3: 3

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

μs

5

The corresponding parameter in the OTDOA assistance data specified in TS 36.355 [4] is the expectedRSTD-Uncertainty index

Number of cells provided in OTDOA assistance data

16

Including the reference cell

Special subframe configuration

6

As specified in table 4.2-1 in TS 36.211 [26]

Uplink-downlink configuration

2

As specified in table 4.2-2 in TS 36.211 [26]

T2

s

5.12

The length of the time interval that follows immediately after time interval T1

T3

s

5.12

The length of the time interval that follows immediately after time interval T2

T4

s

5.12

The length of the time interval that follows immediately after time interval T3

T5

s

5.12

The length of the time interval that follows immediately after time interval T4

T6

s

≥ 58.2

The length of the time interval that follows immediately after time interval T5

9.7.3.4.2 Test procedure

Same as in clause 9.5.3.4.2.

9.7.3.4.3 Message contents

Same as in clause 9.5.3.4.3.

9.7.3.5 Test requirement

Table 9.7.3.5-1 and 9.7.3.5-2 define the primary level settings including test tolerances for the test.

Table 9.7.3.5-1: Cell Specific Test Parameters for intra frequency RSTD Tests for T1 and T6

Parameter

Unit

nCell 1

nCell 2

nCell 3

NB-IoT RF Channel Number

1

1

1

NB-IoT Channel Bandwidth (BWchannel)

kHz

200

200

200

OCNG Pattern Note 1

NOP.3 TDD

N/A

N/A

NPDSCH parameters Note 2

R.18 NB-TDD

N/A

N/A

NPDCCH parameters Note 2

R.30 NB-TDD

N/A

N/A

NPBCH_RA

dB

0

N/A

N/A

NPBCH_RB

NPSS_RA

NSSS_RA

NPDCCH_RA

NPDCCH_RB

NPDSCH_RA

NPDSCH_RB

OCNG_RA Note 1

OCNG_RB Note 1

Note 3

dBm/

15 kHz

-98

NPRS

dB

-Infinity

-Infinity

-Infinity

dB

-2

-Infinity

-Infinity

Propagation Condition

AWGN

Antenna Configuration

1×1

Timing offset to nCell 1

μs

N/A

1

-1

Note 1: OCNG shall be used such that the cell is fully allocated and a constant total transmitted power spectral density is achieved for all OFDM symbols. The OCNG pattern is chosen during the test according to the presence of a DL reference measurement channel.

Note 2: The NPDSCH and NPDCCH reference measurement channels are used in the test only when a downlink transmission dedicated to the UE under test is required.

Note 3: Interference from other cells and noise sources not specified in the test are assumed to be constant over subcarriers and time and shall be modelled as AWGN of appropriate power for to be fulfilled.

Table 9.7.3.5-2: Cell Specific Test Parameters for intra frequency RSTD Tests for T2 to T5

Parameter

Unit

nCell 1

nCell 2

nCell 3

T2 and T4

T3 and T5

T2 and T4

T3 and T5

T2 and T4

T3 and T5

BWchannel

kHz

200

200

200

NB-IoT RF Channel Number

1

1

1

OCNG patterns

NOP.3 TDD

N/A

NOP.3 TDD

NOP.3 TDD

N/A

NPBCH_RA

dB

0

0

0

N/A

NPBCH_RB

NPSS_RA

NSSS_RA

NPDCCH_RA

NPDCCH_RB

NPDSCH_RA

NPDSCH_RB

OCNG_RA Note 1

OCNG_RB Note 1

NPRS_RA

dB

-3

N/A

N/A

0

0

N/A

Note 3

dBm/

15 kHz

-98

-95

-98

-95

-98

-95

NPRS

dB

-15

-Infinity

-Infinity

-15

-15

-Infinity

NPRS Note 4

dB

-15

-Infinity

-Infinity

-15

-15

-Infinity

Io Note 4

dBm/

180kHz

-87.14

-87.12

-87.14

-87.12

-87.14

-87.12

NPRP Note 4

dBm/

15 kHz

-113

-Infinity

-Infinity

-110

-113

-Infinity

NRSRP Note 4

dBm/ 15 kHz

-110

-107

-113

-110

-113

-Infinity

Note 4

dB

-12

-12

-15

-15

-15

-Infinity

Propagation Condition

AWGN

Antenna Configuration

1×1

Timing offset to nCell 1

μs

N/A

1

-1

Note 1: OCNG shall be used such that active cells (all, except Cell 3 in T3) are fully allocated and a constant total transmitted power spectral density is achieved for all OFDM symbols other than those in the subframes with transmitted NPRS.

Note 3: Interference from other cells and noise sources not specified in the test are assumed to be constant over subcarriers and time and shall be modelled as AWGN of appropriate power for to be fulfilled.

Note 4: If NPRS_RA is not “N/A”, , NPRS , Io, NRSRP and NPRP levels have been derived from other parameters and are given for information purpose. If NPRS_RA is “N/A”, Io and NRSRP levels have been derived from other parameters and are given for information purpose. These are not settable test parameters. Interference conditions shall be applied to all PRS symbols of DL positioning subframes.

The response time including test tolerance is 79.3 s. The response time is equal to the LPP time IE value plus the test tolerance.

The LPP time IE value is derived from the maximum allowed RSTD reporting delay plus T2 and T3 plus ΔT, where ΔT = 150 ms, giving a value of 78830 ms. This is rounded up to the next allowed LPP value of 79 seconds.

The maximum allowed RSTD reporting delay is 68.44 s. This time is measured starting from the beginning of time interval T4, to the moment when the UE starts to send preambles on the PRACH for sending the positioning measurement report message to nCell1. The maximum allowed RSTD reporting delay is equal to TRSTD _intra_NB-IoT-EC +TRandomAccess_NB-IoT-EC.

The RSTD measurement time TRSTD _intra_NB-IoT-EC in the test is derived according to section 9.7.3.3 where it is equal to . This gives the total RSTD measurement time of 11.52s for nCell 2 and nCell 3 with respect to the reference nCell 1

The random access to an already detected cell TRandomAccess_NB-IoT-EC can be expressed as: Tevaluate, NB_intra_NB-IoT-EC + TSI + TPRACH_NB-IoT,

Where:

Tevaluate, NB_intra_NB-IoT-EC = 12800 ms: see Table 4.6.2.4-1 in clause 4.6.2.4 in TS 36.133 [23].

TSI = 41560 ms and is the time required for receiving all the relevant system information as defined in TS 36.331 [22] for the target NB-IoT TDD cell.

TPRACH_NB-IoT = 2560 ms and is the additional delay caused by the random access procedure.

This gives TRandomAccess_NB-IoT-EC = 56.92 s for the random access delay to an already detected cell in the test case.

The test tolerances are defined in clauses C.1.3 and C4.

The rate of the correct events for each neighbour cell observed during repeated tests shall be at least 90% with a confidence level of 95%, where the reported RSTD measurement for each correct event shall be within the RSTD reporting range specified in Clause 9.1.10.3, i.e., between RSTD_0000 and RSTD_12711.