O.3 Test conditions

3GPP45.005GSM/EDGE Radio transmission and receptionTS

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

O.3.1 General

This clause specifies the additional parameters that are needed for the test cases specified in clause O.2 and applies to all tests unless otherwise stated.

O.3.1.1 Parameter values

Additionally, amongst all the listed parameters (see clause O.6), the following values for some important parameters are to be used in the MEASURE POSITION REQUEST message.

Table O.3-1: Parameter values

Information element	Value (except nominal accuracy test)	Value (nominal accuracy test)
Required Response Time	20s	20s
Accuracy	51.2 m	7.7 m

For the Moving scenario and periodic location test the following values for some important parameters are to be used in the REGISTER message.

Table O.3-2: Parameter values for Moving scenario and periodic location test

Information element	Value
Reporting Amount	To cover the required test time
Reporting Interval	2s

O.3.1.2 Time assistance

For every Test Instance in each test case, the GANSS Reference Time shall have a random offset, relative to GANSS System Time, within the error range of Coarse Time Assistance defined in the test case. This offset value shall have a uniform random distribution.

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

O.3.1.3 GANSS Reference Time

For every Test Instance in each test case, the GANSS Reference Time shall be advanced so that, at the time the fix is made, it is at least 2 minutes later than the previous fix.

O.3.1.4 Reference and MS locations

There is no limitation on the selection of the reference location, consistent with achieving the required HDOP for the Test Case. For each test instance the reference location shall change sufficiently such that the MS shall have to use the new assistance data. The uncertainty of the semi-major axis is 3 km. The uncertainty of the semi-minor axis is 3 km. The orientation of major axis is 0 degrees. The uncertainty of the altitude information is 500 m. The confidence factor is 68 %.

For every Test Instance in each 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.

For test cases which include satellites from regional systems, such as QZSS and SBAS, the reference location shall be selected within the defined coverage area of the systems.

O.3.1.5 Satellite constellation and assistance data

The satellite constellation shall consist of 24 satellites for GLONASS; 27 satellites for GPS, Modernized GPS and Galileo; 3 satellites for QZSS; 2 satellites for SBAS and 35 satellites for BDS (5 GEO, 27 MEO, 3 IGSO). Almanac assistance data shall be available for all these satellites. At least 7 of the satellites per GPS, Modernized GPS, Galileo, GLONASS or BDS constellation shall be visible to the MS (that is, above 15 degrees elevation with respect to the MS). At least 1 of the satellites for QZSS shall be within 15 degrees of zenith; and at least 1 of the satellites for SBAS shall be visible to the MS. For BDS with reference location in Asia, at least 1 of the visible satellites shall be a GEO (above 15 degrees elevation with respect to the UE). All other satellite specific assistance data shall be available for all visible satellites. In each test, signals are generated for only 6 satellites (or 7 if SBAS is included). The HDOP for the test shall be calculated using these satellites. The simulated satellites for GPS, Modernized GPS, Galileo, GLONASS and BDS shall be selected from the visible satellites for each constellation, consistent with achieving the required HDOP for the test. For BDS with reference location in Asia, 1 of the simulated satellites shall be a GEO.

O.3.1.6 Atmospheric delays

Typical Ionospheric and Tropospheric delays shall be simulated and the corresponding values inserted into the Ionospheric Model IEs.

O.3.1.7 Sensors

The minimum performances shall be met without the use of any data coming from sensors that can aid the positioning.

O.3.1.8 Information elements

The information elements that are available to the MS in all the test cases are listed in clause O.6.

O.3.1.9 GNSS signals

The GNSS signal is defined at the A-GNSS antenna connector of the MS. For MS with integral antenna only, a reference antenna with a gain of 0 dBi is assumed.

O.3.1.10 RESET MS POSITIONING STORED INFORMATION Message

In order to ensure each test instance in each test is performed under Time to First Fix (TTFF) conditions, a dedicated test signal (RESET MS POSITIONING STORED INFORMATION) defined in TS 44.014 shall be used.

When the MS receives the ‘RESET MS POSITIONING STORED INFORMATION‘ signal, with the IE MS POSITIONING TECHNOLOGY set to AGNSS it shall:

– discard any internally stored GPS and GANSS reference time, reference location, and any other aiding data obtained or derived during the previous test instance (e.g. expected ranges and Doppler);

– accept or request a new set of reference time or reference location or other required information, as in a TTFF condition;

– calculate the position or perform GNSS measurements using the ‘new’ reference time or reference location or other information.

O.3.2 GNSS System Time Offsets

If more than one GNSS is used in a test, the accuracy of the GNSS-GNSS Time Offsets used at the system simulator shall be better than 3 ns.