5 GPS information

3GPP51.010-7Mobile Station (MS) conformance specificationPart 7: Location Services (LCS) test scenarios and assistance dataRelease 12TS

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

5.1 GPS Scenario and Assistance data for Assisted GPS signalling tests

5.1.1 General

This subclause defines the GPS scenario and the associated assistance data that shall be used for all Assisted GPS signalling tests defined in TS 51.010-1 [4] subclauses 70.7 to 70.9.

The satellite simulator (SS) shall generate the six satellite signals defined in subclause 5.1.2 and shall provide assistance data as defined in subclauses 5.1.3 to 5.1.8.

Where assistance data is required on a per-satellite basis, or where the values of the data also varies with time it is specified in comma-separated-variable files in the GPS_data.zip file defined in Annex A. These files specify the values to be used for each satellite, indexed by satellite PRN, and, where applicable, the values to be used indexed by both time and satellite PRN.

Assistance data that is marked as "time varying" and the GPS TOW field are only specified and used in 0.96 second increments. Interpolation between these values shall not be used.

The accuracy of the GPS TOW and assistance data that is marked as "time varying" in the provided assistance data shall be within +/- 2 s relative to the GPS time in the system simulator.

Assistance data Information Elements and fields that are not specified shall not be used.

5.1.2 GPS Scenario

The following GPS scenario shall be used. The assistance data specified in the following subclauses is consistent with this GPS scenario:

– Yuma Almanac data: see file Sig Tokyo_Yuma.txt in the GPS_data.zip file defined in Annex A

– MS location and Reference location: static at latitude: 35 degrees 40 minutes north, longitude: 139 degrees 45 minutes east, (Tokyo) height: = 50m

– Start time: 12th September 2003 21:30:00

– Visible satellites simulated: PRNs: 4, 6, 9, 10, 13, 22.

Ionospheric model: see values in subclause 5.1.6

– The levels of the simulated satellites shall all be at -125dBm +/- 6dB

5.1.3 Assistance Data Reference Time

Table 5.1.3.1: Reference Time (Fields occurring once per message)

Parameter	Units	Value/remark
GPS Week	weeks	211
GPS TOW	Sec	509400 Start time. Add integer number of 0.96 seconds as required. (Note)
Note: GPS TOW This is the value of GPS TOW in seconds when the GPS scenario is started in the GPS simulator. The value of GPS TOW to be used in the Reference Time IE shall be calculated at the time the IE is required by adding the elapsed time since the time the scenario was started in the GPS simulator to this value, rounded up to the next 0.96 second interval. This "current GPS TOW" is then also used to determine the value of any other parameters marked as "Time varying" in subclause 5.1

5.1.3a Assistance Data GPS Reference Time Extension

Table 5.1.3a.1: GPS Reference Time Extension (Fields occurring once per message)

Parameter	Units	Value/remark	Release
GPS Week Cycle Number	1024 weeks	1	Rel-10 onwards

5.1.4 Assistance Data Reference Location

Table 5.1.4.1: Reference Location

Parameter	Units	Value/remark
Type of Shape	Bit field	Ellipsoid point with altitude and uncertainty Ellipsoid
Degrees of latitude	degrees	+3.56666666666667 10E1
Degrees of longitude	degrees	+1.39750000000000 10E2
Altitude	m	+50
Uncertainty semi-major	m	3000
Uncertainty semi-minor	m	3000
Orientation of major axis	degrees	0
Uncertainty altitude	m	500
Confidence	%	68

5.1.5 Assistance Data Navigation Model

Table 5.1.5.1: Navigation Model (Fields occurring once per message)

Parameter	Units	Value/remark
Num_Sats_Total		6

Table 5.1.5.2: Navigation Model (Fields occurring once per satellite)

Parameter	Units	Value/remark
SatID		PRNs: 4, 6, 9, 10, 13, 22.
Satellite Status		See file: Sig Navigation_model.csv
C/A or P on L2		See file: Sig Navigation_model.csv
URA Index		See file: Sig Navigation_model.csv
SV Health		See file: Sig Navigation_model.csv
IODC		See file: Sig Navigation_model.csv
L2 P Data Flag		See file: Sig Navigation_model.csv
SF 1 Reserved		See file: Sig Navigation_model.csv
T_GD	sec	See file: Sig Navigation_model.csv
t_oc	sec	See file: Sig Navigation_model.csv
af₂	sec/sec²	See file: Sig Navigation_model.csv
af₁	sec/sec	See file: Sig Navigation_model.csv
af₀	sec	See file: Sig Navigation_model.csv
C_rs	meters	See file: Sig Navigation_model.csv
n	semi-circles/sec	See file: Sig Navigation_model.csv
M₀	semi-circles	See file: Sig Navigation_model.csv
C_uc	radians	See file: Sig Navigation_model.csv
e		See file: Sig Navigation_model.csv
C_us	radians	See file: Sig Navigation_model.csv
(A)^1/2	meters^1/2	See file: Sig Navigation_model.csv
t_oe	sec	See file: Sig Navigation_model.csv
Fit Interval Flag		See file: Sig Navigation_model.csv
AODO	sec	See file: Sig Navigation_model.csv
C_ic	radians	See file: Sig Navigation_model.csv
OMEGA₀	semi-circles	See file: Sig Navigation_model.csv
C_is	radians	See file: Sig Navigation_model.csv
i₀	semi-circles	See file: Sig Navigation_model.csv
C_rc	meters	See file: Sig Navigation_model.csv
	semi-circles	See file: Sig Navigation_model.csv
OMEGAdot	semi-circles/sec	See file: Sig Navigation_model.csv
Idot	semi-circles/sec	See file: Sig Navigation_model.csv

5.1.6 Assistance Data Ionospheric Model

Table 5.1.6.1: Assistance Data Ionospheric Model

Parameter	Units	Value/remark
₀	seconds	4.6566129 10E-9
₁	sec/semi-circle	1.4901161 10E-8
₂	sec/(semi-circle)²	-5.96046 10E-8
₃	sec/(semi-circle)³	-5.96046 10E-8
₀	seconds	79872
₁	sec/semi-circle	65536
₂	sec/(semi-circle)²	-65536
₃	sec/(semi-circle)³	-393216

5.1.7 Assistance Data Almanac

Table 5.1.7.1: Almanac (Fields occurring once per message)

Parameter	Units	Value/remark
Num_Sats_Total		24
WN_a	weeks	212

Table 5.1.7.2: Almanac (Fields occurring once per satellite)

Parameter	Units	Value/remark
SatID		PRNs: 1 to 24
E	dimensionless	See file: Sig Almanac.csv
t_oa	sec	See file: Sig Almanac.csv
i	semi-circles	See file: Sig Almanac.csv
OMEGADOT	semi-circles/sec	See file: Sig Almanac.csv
SV Health		See file: Sig Almanac.csv
A^1/2	meters^1/2	See file: Sig Almanac.csv
OMEGA₀	semi-circles	See file: Sig Almanac.csv
	semi-circles	See file: Sig Almanac.csv
M₀	semi-circles	See file: Sig Almanac.csv
af₀	seconds	See file: Sig Almanac.csv
af₁	sec/sec	See file: Sig Almanac.csv

5.1.7a Assistance Data GPS Almanac Extension

Table 5.1.7a.1: GPS Almanac Extension (Fields occurring once per message)

Parameter	Units	Value/remark	Release
Complete Almanac Provided		1 (TRUE)	Rel-10 onwards

5.1.8 Assistance Data Acquisition Assistance

Table 5.1.8.1: GPS Acquisition Assistance – Parameters appearing once per message

Parameter	Units	Value/remark
Number of Satellites		6
GPS TOW	sec	509400 Start time. Add integer number of 0.96 seconds as required. (Note)
Note: GPS TOW This is the value of GPS TOW in seconds when the GPS scenario is started in the GPS simulator. The value of GPS TOW to be used in the Acquisition Assistance IE shall be calculated at the time the IE is required by adding the elapsed time since the time the scenario was started in the GPS simulator to this value, rounded up to the next 0.96 second interval.

Table 5.1.8.2: GPS Acquisition Assistance – Parameters appearing [number of satellites] times per message

Parameter	Units	Value/remark
SVID/PRNID		PRNs: 4, 6, 9, 10, 13, 22.
Doppler (0^th order term)	Hz	Time varying. See file: Sig Acquisition_assist.csv (Note)
Doppler (1^st order term)	Hz/sec	Time varying. See file: Sig Acquisition_assist.csv (Note)
Doppler Uncertainty	Hz	Time varying. See file: Sig Acquisition_assist.csv (Note)
Code Phase	chips	Time varying. See file: Sig Acquisition_assist.csv (Note)
Integer Code Phase		Time varying. See file: Sig Acquisition_assist.csv (Note)
GPS Bit number		Time varying. See file: Sig Acquisition_assist.csv (Note)
Code Phase Search Window	chips	Time varying. See file: Sig Acquisition_assist.csv (Note)
Azimuth	deg	Time varying. See file: Sig Acquisition_assist.csv (Note)
Elevation	deg	Time varying. See file: Sig Acquisition_assist.csv (Note)
Note: Acquisition_assistparameters This field is "Time varying" and its value depends on the "current GPS TOW" as described in subclause 5.1.3. The value of this field to be used shall be determined by taking the "current GPS TOW" value and selecting the field value in the Sig Acquisition_assist.csv file corresponding to the value of "current GPS TOW".

5.1.8a Assistance Data GPS Acquisition Assistance Extension

Table 5.1.8a.1: GPS Acquisition Assistance Extension – Parameters appearing once per message

Parameter	Units	Value/remark	Release
N_SAT		6	Rel-10 onwards

Table 5.1.8a.2: GPS Acquisition Assistance Extension – Parameters appearing [number of satellites] times per message

Parameter	Units	Value/remark	Release
SatID		PRNs: 4, 6, 9, 10, 13, 22.	Rel-10 onwards
Azimuth LSB	degrees	Time varying. Calculated from Azimuth, see file: Sig Acquisition_assist.csv (Note)	Rel-10 onwards
Elevation LSB	degrees	Time varying. Calculated from Elevation, see file: Sig Acquisition_assist.csv (Note)	Rel-10 onwards
Note: This field is "Time varying" and its value depends on the "current GPS TOW" as described in subclause 5.1.3. The value of this field to be used shall be determined by taking the "current GPS TOW" value and selecting the field value in the Sig Acquisition_assist.csv file corresponding to the value of "current GPS TOW".

5.2 GPS Scenarios and Assistance Data for Assisted GPS Minimum Performance tests

5.2.1 General

5.2.1.0 Introduction

This subclause defines the GPS scenarios and assistance data IEs which shall be available for use as specified in all A-GPS Minimum Performance test cases defined in TS 51.010-1 [4] subclause 70.11.

The information elements are given with reference to TS 44.031 [5], where the details are defined.

Subclauses 5.2.2 and 5.2.3 list the assistance data IEs required for performance testing of MS-based mode, and subclauses 5.2.4 and 5.2.5 list the assistance data available for performance testing of MS-assisted mode. Subclause 5.2.6 lists the values of the assistance data IE fields for all performance testing.

The A-GPS minimum performance requirements are defined by assuming that all relevant and valid assistance data is received by the MS in order to perform GPS measurements and/or position calculation. This subclause does not include nor consider delays occurring in the various signalling interfaces of the network.

5.2.1.1 Satellite constellations and assistance data for performance testing

The satellite constellations for performance testing shall consist of 24 satellites. Almanac assistance data shall be available for all these 24 satellites. At least 9 of the satellites shall be visible to the MS (that is above 5 degrees elevation with respect to the MS). Other assistance data shall be available for 9 of these visible satellites. In each test, signals are generated for only a subset of these satellites for which other assistance data is available. The number of satellites in this subset is specified in the test. The satellites in this subset shall all be above 15 degrees elevation with respect to the MS. The HDOP for the test shall be calculated using this subset of satellites. The selection of satellites for this subset shall be random and consistent with achieving the required HDOP for the test.

5.2.1.2 GPS Scenarios for performance testing

5.2.1.2.0 General

This subclause defines the GPS scenarios that shall be used for all Assisted GPS performance tests defined in subclause TS 51.010-1 [4] subclause 70.11.

The GPS scenarios achieve the required HDOP for the Test Cases as defined in the Requirements specification TS 45.005 [8]. They also satisfy the requirement that for each test instance the reference location shall change sufficiently such that the MS shall have to use the new assistance data.

The satellites to be simulated in each test case are specified in subclause 5.2.1.2.5.

The viable running time during which the scenario maintains the required HDOP or HDOPs is given. Once this time has been reached the scenario shall be restarted from its nominal start time.

5.2.1.2.1 GPS Scenario #1

The following GPS scenario #1 shall be used during the TTFF tests defined in TS 51.010-1 [4] subclause 70.11. The assistance data specified in the following subclauses for GPS scenario #1 is consistent with this GPS scenario.

Yuma Almanac data: see file Perf GPS_1_Yuma.txt in the GPS_data_perf.zip file defined in Annex A.

MS location: the MS location is calculated as a random offset from the reference location using the method described in subclause 5.2.1.2.4. The reference location is: latitude: 33 degrees 45 minutes 0.019 seconds north, longitude: 84 degrees 23 minutes 0.011 seconds west, (Atlanta USA), height: = 300m.

Nominal start time: 22nd January 2005 (Saturday) 00:08:00.

Viable running time to maintain specified HDOP values: 19 minutes.

Visible satellites available for simulation and for which Assistance Data (other than Almanac) shall be generated: PRNs: 2, 6, 10, 17, 18, 21, 26, 29, 30.

Ionospheric model: see values in subclause 5.2.6.6.

Tropospheric model: STANAG with SRI equal to 324.8, as defined in STANAG 4294 [6].

5.2.1.2.2 GPS Scenario #2

The following GPS scenario #2 shall be used during the TTFF tests defined in TS 51.010-1 [4] subclause 70.11. The assistance data specified in the following subclauses for GPS scenario #2 is consistent with this GPS scenario.

Yuma Almanac data: see file Perf GPS_2_Yuma.txt in the GPS_data_perf.zip file defined in Annex A.

MS location: the MS location is calculated as a random offset from the reference location using the method described in subclause 5.2.1.2.4. The reference location is: latitude: 37 degrees 48 minutes 59.988 seconds south, longitude: 144 degrees 58 minutes 0.013 seconds east, (Melbourne Australia), height: = 100m.

Nominal start time: 22nd January 2004 (Thursday) 00:08:00.

Viable running time to maintain specified HDOP values: 19 minutes.

Visible satellites available for simulation and for which Assistance Data (other than Almanac) shall be generated: PRNs: 3, 11, 14, 15, 18, 22, 23, 25, 31.

Ionospheric model: see values in subclause 5.2.6.6.

Tropospheric model: STANAG with SRI equal to 324.8, as defined in STANAG 4294 [6].

5.2.1.2.3 GPS Scenario #3

The following GPS scenario #3 shall be used during the Moving Scenario and Periodic Location test case defined in TS 51.010-1 [4] subclause 70.11. The assistance data specified in the following subclauses for GPS scenario #3 is consistent with this GPS scenario.

Yuma Almanac data: see file Perf GPS_3_Yuma.txt in the GPS_data_perf.zip file defined in Annex A.

MS location: the MS location is given as a trajectory as shown in Figure 70.11.9.1 of TS 51.010-1 [4] subclause 70.11. The reference location is at the centre of the trajectory and is at: latitude: 37 degrees 48 minutes 59.988 seconds south, longitude: 144 degrees 58 minutes 0.013 seconds east, (Melbourne Australia), height: = 100m.

Start time: 22nd January 2004 (Thursday) 00:08:00.

Start location: at the point between l₁₁ and l₁₂ in Figure 70.11.9.1 of TS 51.010-1 [4] subclause 70.11, going in a clock-wise direction.

Visible satellites available for simulation and for which Assistance Data (other than Almanac) shall be generated: PRNs: 3, 11, 14, 15, 18, 22, 23, 25, 31.

Viable running time to maintain specified HDOP values: 19 minutes.

Ionospheric model: see values in subclause 5.2.6.6.

Tropospheric model: STANAG with SRI equal to 324.8, as defined in STANAG 4294 [6].

5.2.1.2.4 MS Location for TTFF test cases

5.2.1.2.4.0 General

This subclause defines the method for generating the random MS locations that are required to be used for the TTFF tests defined in TS 51.010-1 [4] subclause 70.11.

For every Test Instance in each TTFF test case, the MS location shall be randomly selected to be within 3 km of the Reference Location. The Altitude of the MS shall be randomly selected between 0 m to 500 m above WGS‑84 reference ellipsoid. These values shall have uniform random distributions.

The MS location is calculated as an offset from the Reference Location.

5.2.1.2.4.1 MS Location Offset

The MS location offset shall be calculated by selecting the next pair of random numbers, representing a pair of latitude and longitude offsets in degrees, from a standard uniform random number generator, with the following properties:

The ranges of the latitude and longitude offsets values shall be such that when translated onto the surface of the earth they shall lie within a 3km radius circle, centred on the Reference location specified for the GPS scenario under consideration. For the purposes of this calculation make the following assumptions:

a) Over the 3km radius circle at the Reference location the earth is flat and the meridians and parallels form a rectangular grid

b) The earth is spherical with a radius of 6371141m (equal to the WGS 84 value at 35 degrees latitude)

The resolution used for the latitude and longitude offsets values shall be 90/2E23 for the latitude offset values and 360/2E24 for the longitude offset values, representing the coding resolution in degrees specified in 3GPP TS 23.032 [7].

5.2.1.2.4.2 MS Altitude

The MS altitude value shall be calculated by selecting the next random number from a standard uniform random number generator, in the range 0 to 500, representing meters. The resolution used for the random number shall be 1, representing 1 meter.

5.2.1.2.5 Satellites to be simulated in each test case

The satellites to be simulated in each test case have been selected in order to achieve the required HDOP for that test case.

Table 5.2.1.2.5.1: Satellites to be simulated

Test case	PRNs GPS #1	PRNs GPS #2	PRNs GPS #3
Sensitivity Coarse Time Assistance	2, 6, 10, 17, 18, 21, 26, 29	3, 11, 14, 15, 22, 23, 25, 31
Sensitivity Fine Time Assistance	2, 6, 10, 17, 18, 21, 26, 29	3, 11, 14, 15, 22, 23, 25, 31
Nominal Accuracy	2, 6, 10, 17, 18, 21, 26, 29	3, 11, 14, 15, 22, 23, 25, 31
Dynamic Range	2, 6, 10, 17, 26, 29	3, 14, 15, 22, 25, 31
Multi-Path scenario	2, 6, 17, 21, 26	3, 14, 15, 22, 25
Moving Scenario and Periodic location			3, 14, 15, 22, 25

5.2.2 Information elements required for normal MS based testing

The following A-GPS assistance data IEs and fields shall be present for each test. Fields not specified shall not be present. The values of the fields are specified in subclause 5.2.6.

a) Reference Time IE. This information element is defined in subclause A.4.2.4 of TS 44.031 [5].

Fields of the IE

GPS Week

GPS TOW

GPS TOW Assist

SatID

TLM Message

Anti-Spoof

Alert

TLM Reserved

aa) GPS Reference Time Extension IE. This information element is defined in subclause A.4.2.4c of TS 44.031 [5].

Fields of the IE	Release
GPS Week Cycle Number	Rel-10 onwards

b) Reference Location IE. This information element is defined in subclause A.4.2.4 of TS 44.031 [5].

Fields of the IE

Ellipsoid point with Altitude and uncertainty ellipsoid

c) Navigation Model IE. This information element is defined in subclause A.4.2.4 of TS 44.031 [5].

Fields of the IE

All satellite information

d) Ionospheric Model IE. This information element is defined in subclause A.4.2.4 of TS 44.031 [5].

Fields of the IE

All

5.2.3 Information elements required for MS based Sensitivity Fine Time Assistance test case

The A-GPS assistance data IEs and fields that shall be present for the Sensitivity Fine Time Assistance test case shall be those specified in subclause 5.2.2 with the following exception. Fields not specified shall not be present. The values of the fields are specified in subclause 5.2.6.

Reference Time IE. This information element is defined in subclause A.4.2.4 of TS 44.031 [5].

Fields of the IE

GPS Week

GPS TOW

BCCH Carrier

BSIC

FNm

GPS TOW Assist

SatID

TLM Message

Anti-Spoof

Alert

TLM Reserved

5.2.4 Information elements available for normal MS assisted testing

The following A-GPS assistance data IEs and fields shall be available for use in each test. Fields not specified shall not be present. The values of the fields are specified in subclause 5.2.6.

a) Reference Time IE. This information element is defined in subclause A.4.2.4 of TS 44.031 [5].

Fields of the IE

GPS Week

GPS TOW

GPS TOW Assist

SatID

TLM Message

Anti-Spoof

Alert

TLM Reserved

aa) GPS Reference Time Extension IE. This information element is defined in subclause A.4.2.4c of TS 44.031 [5].

Fields of the IE	Release
GPS Week Cycle Number	Rel-10 onwards

b) Reference Location IE. This information element is defined in subclause A.4.2.4 of TS 44.031 [5].

Fields of the IE

Ellipsoid point with Altitude and uncertainty ellipsoid

c) Almanac IE. This information element is defined in subclause A.4.2.4 of TS 44.031 [5].

Fields of the IE

Almanac Reference Week

All Satellite information

ca) GPS Almanac Extension IE. This information element is defined in subclause A.4.2.4c of TS 44.031 [5].

Fields of the IE	Release
Complete Almanac Provided	Rel-10 onwards

d) Navigation Model IE. This information element is defined in subclause A.4.2.4 of TS 44.031 [5].

Fields of the IE

All satellite information

e) Acquisition Assistance IE. This information element is defined in subclause A.4.2.4 of TS 44.031 [5].

Fields of the IE

GPS TOW

Satellite information

SVID/PRNID

Doppler (0th order term)

Doppler (1st order term)

Doppler Uncertainty

Code Phase

Integer Code Phase

GPS Bit number

Code Phase Search Window

Azimuth

Elevation

f) GPS Acquisition Assistance Extension IE. This information element is defined in subclause A.4.2.4c of TS 44.031 [5].

Fields of the IE	Release
N_SAT	Rel-10 onwards
SatID	Rel-10 onwards
Azimuth LSB	Rel-10 onwards
Elevation LSB	Rel-10 onwards

5.2.5 Information elements available for MS assisted Sensitivity Fine Time Assistance test case

The A-GPS assistance data IEs and fields that shall be available for use for the Sensitivity Fine Time Assistance test case shall be those specified in subclause 5.2.4 with the following exceptions. Fields not specified shall not be present. The values of the fields are specified in subclause 5.2.6.

a) Reference Time IE. This information element is defined in subclause A.4.2.4 of TS 44.031 [5].

Fields of the IE

GPS Week

GPS TOW

BCCH Carrier

BSIC

FNm

GPS TOW Assist

SatID

TLM Message

Anti-Spoof

Alert

TLM Reserved

b) Acquisition Assistance IE. This information element is defined in subclause A.4.2.4 of TS 44.031 [5].

Fields of the IE

GPS TOW

BCCH Carrier

BSIC

Frame #

Timeslots #

Bit #

SVID/PRNID

Doppler (0th order term)

Doppler (1st order term)

Doppler Uncertainty

Code Phase

Integer Code Phase

GPS Bit number

Code Phase Search Window

Azimuth

Elevation

5.2.6 Contents of Information elements for Minimum performance testing

5.2.6.1 General

This subclause defines the assistance data values that shall be used for all Assisted GPS performance tests defined in TS 51.010-1 [4] subclause 70.11. It is given for GPS scenarios #1, #2 and #3 where it is different for each scenario; otherwise it is marked "All" where the same value is used for all scenarios.

Where assistance data is required on a per-satellite basis, or where the values of the data also varies with time it is specified in comma-separated-variable files with suffixes XX in the GPS_data_perf.zip file defined in Annex A, where XX is 01, 02 and 03 for GPS scenarios #1, #2 and #3 respectively. These files specify the values to be used for each satellite, indexed by satellite PRN, and, where applicable, the values to be used indexed by both time and satellite PRN.

Assistance data that is marked as "time varying" is specified and used in 80 ms increments. Interpolation between these values shall not be used.

Assistance data Information Elements and fields that are not specified shall not be used.

5.2.6.2 IE Random Offset Values

5.2.6.2.0 Introduction

This subclause defines the methods for generating the random offsets that are required to be applied to one or two assistance data IEs for certain tests defined in TS 51.010-1 [4] subclause 70.11.

5.2.6.2.1 GPS TOW

For every Test Instance in each TTFF test case, the IE GPS TOW shall have a random offset, relative to GPS system time, within the allowed error range of Coarse Time Assistance defined in the test case. This offset value shall have a uniform random distribution.

Note: For the Moving Scenario and Periodic Update Test Case the value of the IE GPS TOW shall be set to the nominal value, i.e. no offset shall be used.

The offset value shall be calculated by selecting the next random number from a standard uniform random number generator, in the range specified for the GPS Coarse Time assistance error range in the Test Requirements, Test parameters table for the test under consideration. The resolution used for the random number shall be 0.01, representing 10ms.

5.2.6.2.2 GPS bit number (BN or Bit #)

In addition, for every Fine Time Assistance Test Instance the IE BN or Bit # shall have a random offset, relative to the true value of the relationship between the two time references, within the allowed error range of Fine Time Assistance defined in the test case. This offset value shall have a uniform random distribution.

The offset value shall be calculated by selecting the next random number from a standard uniform random number generator with the following properties:

The range shall be the number of GSM bits whose duration is less than the range specified for the GPS Fine Time assistance error range in the Test Requirements, Test parameters table for the test under consideration.

The resolution used for the random number shall be 1, representing 1 GSM bit.

5.2.6.3 Assistance Data Reference Time

Contents of Reference Time IE

Table 5.2.6.3.1: Reference Time (Fields occurring once per message)

Parameter	Units	Value/remark GPS #1	Value/remark GPS #2	Value/remark GPS #3
GPS Week	weeks	282	230	230
GPS TOW	ms	518880000 Start time. Add number of 80ms as required. (Note 1)	346080000 Start time. Add number of 80ms as required. (Note 1)	346080000 Start time. Add number of 80ms as required. (Note 1)
BCCH Carrier		ARFCN of serving BCCH Present for Sensitivity Fine Time Assistance test case. Absent otherwise.	ARFCN of serving BCCH Present for Sensitivity Fine Time Assistance test case. Absent otherwise.
BSIC		BSIC of serving BCCH Present for Sensitivity Fine Time Assistance test case. Absent otherwise.	BSIC of serving BCCH Present for Sensitivity Fine Time Assistance test case. Absent otherwise.
FNm		Present for Sensitivity Fine Time Assistance test case. Absent otherwise. Note 2	Present for Sensitivity Fine Time Assistance test case. Absent otherwise. Note 2
TN		Present for Sensitivity Fine Time Assistance test case. Absent otherwise. Note 2	Present for Sensitivity Fine Time Assistance test case. Absent otherwise. Note 2
BN		Present for Sensitivity Fine Time Assistance test case. Absent otherwise. Note 2	Present for Sensitivity Fine Time Assistance test case. Absent otherwise. Note 2
Note 1: GPS TOW This is the value in ms of GPS TOW when the GPS scenario is initially started in the GPS simulator. For all TTFF test cases, each time a GPS scenario is used, the GPS start time shall be advanced by 120 seconds from the value last used so that, at the time the fix is made, it is at least 2 minutes later than the previous fix made with that scenario. The actual value of GPS TOW to be used in the Reference Time IE (before the addition of the random offset, if applicable) shall be calculated at the time the IE is required by adding the elapsed time since the time the scenario was started in the GPS simulator to this value. The accuracy shall be such that the Maximum Test System Uncertainty for Coarse Time Assistance, specified in Table A5.5.1 of TS 51.010-1 [4] , shall be met. For all TTFF test cases a random offset is then added to the value of GPS TOW as described in subclause 5.2.6.2 Note 2: GSM Frame Number (FNm), Timeslot Number (TN) and Bit Number (BN) The values of the IEs FNm, TN and BN (before the addition of the random offset) shall be calculated at the time the IE is required. The accuracy of the relationship between the two time references shall be such that the Maximum Test System Uncertainty for Fine Time Assistance, specified in Table A5.5.1 of TS 51.010-1 [4] , shall be met. A random offset is then added to the value of BN as described in subclause 5.2.6.2

Table 5.2.6.3.2: Satellite Information

Parameter	Units	Value/remark GPS All
Number of satellites		9

Table 5.2.6.3.3: Reference Time – GPS TOW Assist (Fields occurring once per satellite)

Parameter	Units	Value/remark GPS #1	Value/remark GPS #2	Value/remark GPS #3
SatID		PRNs: 2, 6, 10, 17, 18, 21, 26, 29, 30	PRNs: 3, 11, 14, 15, 18, 22, 23, 25, 31	PRNs: 3, 11, 14, 15, 18, 22, 23, 25, 31

Table 5.2.6.3.4: Reference Time – GPS TOW Assist (Fields occurring once per satellite)

Parameter	Units	Value/remark GPS All
TLM Message	Bit string	10922
Anti-Spoof	Bit string	1
Alert		0
TLM Reserved		2

5.2.6.3a Assistance Data GPS Reference Time Extension

Contents of GPS Reference Time Extension IE

Table 5.2.6.3a.1: GPS Reference Time Extension (Fields occurring once per message)

Parameter	Units	Value/remark GPS All	Release
GPS Week Cycle Number	1024 weeks	1	Rel-10 onwards

5.2.6.4 Assistance Data Reference Location

Contents of Reference Location IE

The uncertainty of the semi-major axis is 3 km. The uncertainty of the semi-minor axis is 3 km. The orientation of the major axis is 0 degrees. The uncertainty of the altitude information is 500 m. The confidence factor is 68%.

Table 5.2.6.4.1: Reference Location

Parameter	Units	Value/remark GPS #1	Value/remark GPS #2	Value/remark GPS #3
Type of Shape	Bit field	Ellipsoid point with altitude and uncertainty Ellipsoid	Ellipsoid point with altitude and uncertainty Ellipsoid	Ellipsoid point with altitude and uncertainty Ellipsoid
Degrees of latitude	degrees	33.750005	-37.816663	-37.816663
Degrees of longitude	degrees	-84.383336	144.966670	144.966670
Altitude	m	+300	+100	+100
Uncertainty semi-major	m	3000	3000	3000
Uncertainty semi-minor	m	3000	3000	3000
Orientation of major axis	degrees	0	0	0
Uncertainty altitude	m	500	500	500
Confidence	%	68	68	68

5.2.6.5 Assistance Data Navigation Model

Contents of Navigation Model IE

Table 5.2.6.5.1: Satellite Information

Parameter	Units	Value/remark GPS All
Number of satellites		9

Table 5.2.6.5.2: Navigation Model (Fields occurring once per satellite)

Parameter	Units	Value/remark GPS #1	Value/remark GPS #2	Value/remark GPS #3
SatID		PRNs: 2, 6, 10, 17, 18, 21, 26, 29, 30	PRNs: 3, 11, 14, 15, 18, 22, 23, 25, 31	PRNs: 3, 11, 14, 15, 18, 22, 23, 25, 31
Satellite Status		0 (Note)	0 (Note)	0 (Note)
Note: For consistency Satellite Status is also given in file: Perf Navigation_model_XX.csv

Table 5.2.6.5.3: Ephemeris and Clock Correction parameters (Fields occurring once per satellite)

Parameter	Units	Value/remark GPS All
C/A or P on L2		See file: Perf Navigation_model_XX.csv
URA Index		See file: Perf Navigation_model_XX.csv
SV Health		See file: Perf Navigation_model_XX.csv
IODC		See file: Perf Navigation_model_XX.csv
L2 P Data Flag		See file: Perf Navigation_model_XX.csv
SF 1 Reserved		See file: Perf Navigation_model_XX.csv
T_GD	sec	See file: Perf Navigation_model_XX.csv
t_oc	sec	See file: Perf Navigation_model_XX.csv
af₂	sec/sec²	See file: Perf Navigation_model_XX.csv
af₁	sec/sec	See file: Perf Navigation_model_XX.csv
af₀	sec	See file: Perf Navigation_model_XX.csv
C_rs	meters	See file: Perf Navigation_model_XX.csv
n	semi-circles/sec	See file: Perf Navigation_model_XX.csv
M₀	semi-circles	See file: Perf Navigation_model_XX.csv
C_uc	radians	See file: Perf Navigation_model_XX.csv
e		See file: Perf Navigation_model_XX.csv
C_us	radians	See file: Perf Navigation_model_XX.csv
(A)^1/2	meters^1/2	See file: Perf Navigation_model_XX.csv
t_oe	sec	See file: Perf Navigation_model_XX.csv
Fit Interval Flag		See file: Perf Navigation_model_XX.csv
AODO	sec	See file: Perf Navigation_model_XX.csv
C_ic	radians	See file: Perf Navigation_model_XX.csv
OMEGA₀	semi-circles	See file: Perf Navigation_model_XX.csv
C_is	radians	See file: Perf Navigation_model_XX.csv
i₀	semi-circles	See file: Perf Navigation_model_XX.csv
C_rc	meters	See file: Perf Navigation_model_XX.csv
	semi-circles	See file: Perf Navigation_model_XX.csv
OMEGAdot	semi-circles/sec	See file: Perf Navigation_model_XX.csv
Idot	semi-circles/sec	See file: Perf Navigation_model_XX.csv

5.2.6.6 Assistance Data Ionospheric Model

Contents of Ionospheric Model IE

Table 5.2.6.6.1: Ionospheric Model

Parameter	Units	Value/remark GPS All
₀	seconds	4.6566129 10E-9
₁	sec/semi-circle	1.4901161 10E-8
₂	sec/(semi-circle)²	-5.96046 10E-8
₃	sec/(semi-circle)³	-5.96046 10E-8
₀	seconds	79872
₁	sec/semi-circle	65536
₂	sec/(semi-circle)²	-65536
₃	sec/(semi-circle)³	-393216

5.2.6.7 Assistance Data Almanac

Contents of Almanac

Table 5.2.6.7.1: Almanac (Field occurring once per message)

Parameter	Units	Value/remark GPS #1	Value/remark GPS #2	Value/remark GPS #3
WN_a	weeks	27	230	230

Table 5.2.6.7.2: Satellite Information

Parameter	Units	Value/remark GPS All
Number of satellites		24

Table 5.2.6.7.3: Almanac (Fields occurring once per satellite)

Parameter	Units	Value/remark GPS #1	Value/remark GPS #2	Value/remark GPS #3
SatID		PRNs: 1, 2, 4, 5, 6, 7, 9, 10, 11, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 29, 30	PRNs: 1, 2, 3, 4, 5, 6, 7, 8, 11, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23, 25, 27, 28, 30, 31	PRNs: 1, 2, 3, 4, 5, 6, 7, 8, 11, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23, 25, 27, 28, 30, 31

Table 5.2.6.7.4: Almanac (Fields occurring once per satellite)

Parameter	Units	Value/remark GPS All
e	dimensionless	See file: Perf Almanac_XX.csv
t_oa	sec	See file: Perf Almanac_XX.csv
i	semi-circles	See file: Perf Almanac_XX.csv
OMEGADOT	semi-circles/sec	See file: Perf Almanac_XX.csv
SV Health		See file: Perf Almanac_XX.csv
A^1/2	meters^1/2	See file: Perf Almanac_XX.csv
OMEGA₀	semi-circles	See file: Perf Almanac_XX.csv
	semi-circles	See file: Perf Almanac_XX.csv
M₀	semi-circles	See file: Perf Almanac_XX.csv
af₀	seconds	See file: Perf Almanac_XX.csv
af₁	sec/sec	See file: Perf Almanac_XX.csv

5.2.6.7a Assistance Data GPS Almanac Extension

Contents of GPS Almanac Extension IE

Table 5.2.6.7a.1: GPS Almanac Extension (Fields occurring once per message)

Parameter	Units	Value/remark GPS All	Release
Complete Almanac Provided		1 (TRUE)	Rel-10 onwards

5.2.6.8 Assistance Data Acquisition Assistance

Contents of Acquisition Assistance IE

Table 5.2.6.8.1: GPS Acquisition Assistance (Fields occurring once per message)

Parameter	Units	Value/remark GPS #1	Value/remark GPS #2	Value/remark GPS #3
GPS TOW	ms	51888000 Start time. Add number of 80ms as required. (Note 1)	346080000 Start time. Add number of 80ms as required. (Note 1)	346080000 Start time. Add number of 80ms as required. (Note 1)
BCCH Carrier		ARFCN of serving BCCH Present for Sensitivity Fine Time Assistance test case. Absent otherwise.	ARFCN of serving BCCH Present for Sensitivity Fine Time Assistance test case. Absent otherwise.	Absent
BSIC		BSIC of serving BCCH Present for Sensitivity Fine Time Assistance test case. Absent otherwise.	BSIC of serving BCCH Present for Sensitivity Fine Time Assistance test case. Absent otherwise.
Frame #		Present for Sensitivity Fine Time Assistance test case. Absent otherwise. Note 2	Present for Sensitivity Fine Time Assistance test case. Absent otherwise. Note 2
Timeslots #		Present for Sensitivity Fine Time Assistance test case. Absent otherwise. Note 2	Present for Sensitivity Fine Time Assistance test case. Absent otherwise. Note 2
Bit #		Present for Sensitivity Fine Time Assistance test case. Absent otherwise. Note 2	Present for Sensitivity Fine Time Assistance test case. Absent otherwise. Note 2
Note 1: GPS TOW This is the value in ms of GPS TOW when the GPS scenario is initially started in the GPS simulator. For all TTFF test cases, each time a GPS scenario is used, the GPS start time shall be advanced by 120 seconds from the value last used so that, at the time the fix is made, it is at least 2 minutes later than the previous fix made with that scenario. The actual value of GPS TOW to be used in the Acquisition Assistance IE (before the addition of the random offset, if applicable) shall be calculated at the time the IE is required by adding the elapsed time since the time the scenario was started in the GPS simulator to this value. The accuracy shall be such that the Maximum Test System Uncertainty for Coarse Time Assistance, specified in Table A5.5.1 of TS 51.010-1 [4] , shall be met. For all TTFF test cases a random offset is then added to the value of GPS TOW as described in subclause 5.2.6.2 This "final GPS TOW" value is then also used to determine the value of the Acquisition Assistance parameters marked as "Time varying" in subclause 5.2.6.8 Note 2: GSM Frame Number (Frame #), Timeslot Number (Timeslots #) and Bit Number (Bit #) The values of the IEs Frame #, Timeslots # and Bit # (before the addition of the random offset) shall be calculated at the time the IE is required. The accuracy of the relationship between the two time references shall be such that the Maximum Test System Uncertainty for Fine Time Assistance, specified in Table A5.5.1 of TS 51.010-1 [4] , shall be met. A random offset is then added to the value of Bit # as described in subclause 5.2.6.2

Table 5.2.6.8.2: Satellite Information

Parameter	Units	Value/remark GPS All
Number of satellites		9

Table 5.2.6.8.3: GPS Acquisition Assistance (Fields occurring once per satellite)

Parameter	Units	Value/remark GPS #1	Value/remark GPS #2	Value/remark GPS #3
SVID/PRNID		PRNs: 2, 6, 10, 17, 18, 21, 26, 29, 30	PRNs: 3, 11, 14, 15, 18, 22, 23, 25, 31	PRNs: 3, 11, 14, 15, 18, 22, 23, 25, 31

Table 5.2.6.8.4: GPS Acquisition Assistance (Fields occurring once per satellite)

Parameter	Units	Value/remark GPS All
Doppler (0^th order term)	Hz	Time varying. See file: Perf Acquisition_assistXX.csv (Note)
Doppler (1^st order term)	Hz/sec	Time varying. See file: Perf Acquisition_assistXX.csv (Note)
Doppler Uncertainty	Hz	Time varying. See file: Perf Acquisition_assistXX.csv (Note)
Code Phase	chips	Time varying. See file: Perf Acquisition_assistXX.csv (Note)
Integer Code Phase		Time varying. See file: Perf Acquisition_assistXX.csv (Note)
GPS Bit number		Time varying. See file: Perf Acquisition_assistXX.csv (Note)
Code Phase Search Window	chips	Time varying. See file: Perf Acquisition_assistXX.csv (Note)
Azimuth	deg	Time varying. See file: Perf Acquisition_assistXX.csv (Note)
Elevation	deg	Time varying. See file: Perf Acquisition_assistXX.csv (Note)
Note: Acquisition Assistance parameters This field is "Time varying" and its value depends on the "final GPS TOW" as described in subclause 5.2.6.8. The value of this field to be used shall be determined by taking the "final GPS TOW" value and selecting the nearest field value in the Perf Acquisition_assistXX.csv file corresponding to the value of "final current GPS TOW".

5.2.6.8a Assistance Data GPS Acquisition Assistance Extension

Contents of GPS Acquisition Assistance Extension IE

Table 5.2.6.8a.1: GPS Acquisition Assistance Extension (Fields occurring once per message)

Parameter	Units	Value/remark GPS All	Release
N_SAT		9	Rel-10 onwards

Table 5.2.6.8a.2: GPS Acquisition Assistance Extension (Fields occurring once per satellite)

Parameter	Units	Value/remark GPS All	Release
SatID		See SVID/PRNID values in Table 5.2.6.8.3	Rel-10 onwards
Azimuth LSB	degrees	Time varying. Calculated from Azimuth, see file: Perf Acquisition_assistXX.csv (Note)	Rel-10 onwards
Elevation LSB	degrees	Time varying. Calculated from Elevation, see file: Perf Acquisition_assistXX.csv (Note)	Rel-10 onwards
Note: This field is "Time varying" and its value depends on the "current GPS TOW" as described in subclause 5.1.3. The value of this field to be used shall be determined by taking the "current GPS TOW" value and selecting the field value in the Perf Acquisition_assistXX.csv file corresponding to the value of "current GPS TOW".