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TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
Requirements for support of
Assisted Global Positioning System (A-GPS);
Frequency Division Duplex (FDD)
(3GPP TS 25.171 version 15.0.0 Release 15)
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3GPP TS 25.171 version 15.0.0 Release 15 1 ETSI TS 125 171 V15.0.0 (2018-07)
Reference
RTS/TSGR-0425171vf00
Keywords
UMTS
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3GPP TS 25.171 version 15.0.0 Release 15 2 ETSI TS 125 171 V15.0.0 (2018-07)
Intellectual Property Rights
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Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
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3GPP TS 25.171 version 15.0.0 Release 15 3 ETSI TS 125 171 V15.0.0 (2018-07)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 5
1 Scope . 6
2 References . 6
3 Definitions, symbols, abbreviations and test tolerances . 7
3.1 Definitions . 7
3.2 Symbols . 7
3.3 Abbreviations . 7
3.4 Test tolerances . 8
4 General . 8
4.1 Introduction . 8
4.2 Measurement parameters . 8
4.2.1 UE based A-GPS measurement parameters . 8
4.2.2 UE assisted A-GPS measurement parameters. 8
4.3 Response time . 8
4.4 Time assistance . 8
4.4.1 Use of fine time assistance . 9
4.5 RRC states . 9
4.6 2D position error . 9
5 A-GPS minimum performance requirements . 9
5.1 Sensitivity . 9
5.1.1 Coarse time assistance . 9
5.1.1.1 Minimum Requirements (Coarse time assistance) . 9
5.1.2 Fine time assistance . 10
5.1.2.1 Minimum Requirements (Fine time assistance) . 10
5.2 Nominal Accuracy . 10
5.2.1 Minimum requirements (nominal accuracy) . 10
5.3 Dynamic Range . 10
5.3.1 Minimum requirements (dynamic range) . 11
5.4 Multi-Path scenario . 11
5.4.1 Minimum Requirements (multi-path scenario) . 11
5.5 Moving scenario and periodic update . 11
5.5.1 Minimum Requirements (moving scenario and periodic update) . 12
Annex A (normative): Test cases . 13
A.1 Conformance tests . 13
A.2 Requirement classification for statistical testing . 13
Annex B (normative): Test conditions. 14
B.1 General . 14
B.1.1 Parameter values . 14
B.1.2 Time assistance . 14
B.1.3 GPS Reference Time . 14
B.1.4 Reference and UE locations . 14
B.1.5 Satellite constellation and assistance data . 15
B.1.6 Atmospheric delays . 15
B.1.7 UTRA Frequency and frequency error . 15
B.1.8 Information elements . 15
B.1.9 GPS signals . 15
B.1.10 RESET UE POSITIONING STORED INFORMATION Message . 15
ETSI
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3GPP TS 25.171 version 15.0.0 Release 15 4 ETSI TS 125 171 V15.0.0 (2018-07)
Annex C (normative): Propagation conditions . 16
C.1 General . 16
C.2 Propagation Conditions . 16
C.2.1 Static propagation conditions . 16
C.2.2 Multi-path Case G1 . 16
Annex D (normative): Measurement sequence chart . 17
D.1 General . 17
D.2 UE Based A-GPS Measurement Sequence Chart . 17
D.2.1 UE Based GPS Message Sequence Normal . 17
D.2.2 UE Based GPS Message Sequence Normal for moving scenario and periodic update test case . 19
D.2.3 UE Based GPS Message Sequence Failure . 20
D.3 UE Assisted A-GPS Measurement Sequence Chart . 20
D.3.1 UE Assisted A-GPS Measurement Sequence Chart Normal . 20
D.3.2 UE assisted A-GPS Measurement Sequence for moving scenario and periodic update test case . 22
Annex E (normative): Assistance data required for testing . 23
E.1 Introduction . 23
E.2 Information elements required for UE-based . 23
E.3 Information elements available for UE-assisted . 24
Annex F (normative): Converting UE-assisted measurement reports into position estimates . 26
F.1 Introduction . 26
F.2 UE measurement reports . 26
F.3 WLS position solution . 27
Annex G (informative): Change History . 29
History . 31
ETSI
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3GPP TS 25.171 version 15.0.0 Release 15 5 ETSI TS 125 171 V15.0.0 (2018-07)
Foreword
rd
This Technical Specification has been produced by the 3 Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
ETSI
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3GPP TS 25.171 version 15.0.0 Release 15 6 ETSI TS 125 171 V15.0.0 (2018-07)
1 Scope
The present document establishes the minimum performance requirements for A-GPS for FDD mode of UTRA for the
User Equipment (UE).
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
- References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
- For a specific reference, subsequent revisions do not apply.
- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including
a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
Release as the present document.
[1] 3GPP TS 25.101: "User Equipment (UE) radio transmission and reception (FDD)".
[2] 3GPP TS 25.104: "Base Station (BS) radio transmission and reception (FDD)".
[3] 3GPP TS 34.171: "Terminal Conformance Specification, Assisted Global Positioning System (A-
GPS) (FDD)".
[4] 3GPP TS 25.331: "Radio Resource Control (RRC) protocol specification".
[5] 3GPP TS 25.302: "Services provided by the physical layer".
[6] 3GPP TS 25.215: "Physical layer; Measurements (FDD)".
[7] ETSI TR 102 273-1-2: "Electromagnetic compatibility and Radio spectrum Matters (ERM);
Improvement on Radiated Methods of Measurement (using test site) and evaluation of the
corresponding measurement uncertainties; Part 1: Uncertainties in the measurement of mobile
radio equipment characteristics; Sub-part 2: Examples and annexes".
[8] Navstar GPS Space Segment/Navigation User Interfaces, ICD-GPS 200, Rev. C.
[9] P. Axelrad, R.G. Brown, "GPS Navigation Algorithms", in Chapter 9 of "Global Positioning
System: Theory and Applications", Volume 1, B.W. Parkinson, J.J. Spilker (Ed.), Am. Inst. of
Aeronautics and Astronautics Inc., 1996.
[10] S.K. Gupta, "Test and Evaluation Procedures for the GPS User Equipment", ION-GPS Red Book,
Volume 1, p. 119.
[11] 3GPP TS 34.109: “Special conformance testing functions”
ETSI
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3GPP TS 25.171 version 15.0.0 Release 15 7 ETSI TS 125 171 V15.0.0 (2018-07)
3 Definitions, symbols, abbreviations and test
tolerances
3.1 Definitions
For the purposes of the present document, the terms and definitions given in 3GPP TS 25.101 [1], 3GPP TS 25.104 [2]
and the following apply:
Horizontal Dilution Of Precision (HDOP): measure of position determination accuracy that is a function of the
geometrical layout of the satellites used for the fix, relative to the receiver antenna
Node B: logical node responsible for radio transmission / reception in one or more cells to/from the User Equipment.
Terminates the Iub interface towards the RNC
L1: L band GPS transmission frequency of 1575.42 MHz
3.2 Symbols
Void
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
A-GPS Assisted - Global Positioning System
AWGN Additive White Gaussian Noise
C/A Coarse/Acquisition
CPICH Common Pilot CHannel
DCH Dedicated CHannel
DPCH Dedicated Physical CHannel
DUT Device Under Test
ECEF Earth Centred, Earth Fixed
FACH Fast Access CHannel
FDD Frequency Division Duplex
GPS Global Positioning System
GSS GPS System Simulator
HDOP Horizontal Dilution Of Precision
LOS Line Of Sight
PICH Paging Indicator CHannel
RRC Radio Resource Control
RSCP Received Signal Code Power
SFN System Frame Number
SMLC Standalone Mobile Location Center
SRNC Serving Radio Network Controller
SS FDD System simulator
TDD Time Division Duplex
TLM TeLeMetry word. It contains an 8-bits preamble (10001011)
TOW Time Of Week
TTFF Time To First Fix
UE User Equipment
UTRA Universal Terrestrial Radio Access
UTRAN Universal Terrestrial Radio Access Network
WLS Weighted Least Square
ETSI
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3GPP TS 25.171 version 15.0.0 Release 15 8 ETSI TS 125 171 V15.0.0 (2018-07)
3.4 Test tolerances
The requirements given in the present document make no allowance for measurement uncertainty. The test specification
3GPP TS 34.171 [3] defines test tolerances. These test tolerances are individually calculated for each test. The test
tolerances are then added to the limits in the present document to create test limits. The measurement results are
compared against the test limits as defined by the shared risk principle.
Shared Risk is defined in ETR 273-1-2 [7], subclause 6.5.
4 General
4.1 Introduction
The present document defines the minimum performance requirements for both UE based and UE assisted FDD A-GPS
terminals.
4.2 Measurement parameters
4.2.1 UE based A-GPS measurement parameters
In case of UE-based A-GPS, the measurement parameters are contained in the RRC UE POSITIONING POSITION
ESTIMATE INFO IE. The measurement parameter in case of UE-based A-GPS is the horizontal position estimate
reported by the UE and expressed in latitude/longitude.
4.2.2 UE assisted A-GPS measurement parameters
In case of UE-assisted A-GPS, the measurement parameters are contained in the RRC UE POSITIONING GPS
MEASURED RESULTS IE. The measurement parameters in case of UE-assisted A-GPS are the UE GPS Code Phase
measurements, as specified in 3GPP TS 25.302 [5] and 3GPP TS 25.215 [6]. The UE GPS Code Phase measurements
are converted into a horizontal position estimate using the procedure detailed in Annex F.
4.3 Response time
Max Response Time is defined as the time starting from the moment that the UE has received the final RRC
measurement control message containing reporting criteria different from "No Reporting" sent before the UE sends the
measurement report containing the position estimate or the GPS measured result, and ending when the UE starts
sending the measurement report containing the position estimate or the GPS measured result on the Uu interface. The
response times specified for all test cases are Time-to-First-Fix (TTFF) unless otherwise stated, i.e. the UE shall not
re-use any information on GPS time, location or other aiding data that was previously acquired or calculated and stored
internally in the UE. A dedicated test message 'RESET UE POSITIONING STORED INFORMATION' has been
defined in TS 34.109 [11] clause 5.4 for the purpose of deleting this information and is detailed in subclause B.1.10.
4.4 Time assistance
Time assistance is the provision of GPS time to the UE from the network via RRC messages. Currently two different
GPS time assistance methods can be provided by the network.
a) Coarse time assistance is always provided by the network and provides current GPS time to the UE. The time
provided is within ±2 seconds of GPS system time. This allows the GPS time to be known within one GPS
navigation data sub-frame. It is signalled to the UE by means of the GPS Week and GPS TOW msec fields in the
Reference Time assistance data IE.
b) Fine time assistance is optionally provided by the network and adds the provision to the UE of the relationship
between the GPS system time and the current UTRAN time. The accuracy of this relationship is ±10 μs of the
actual relationship. This addresses the case when the network can provide an improved GPS time accuracy. It is
signalled to the UE by means of the SFN and UTRAN GPS timing of cell frames fields in the Reference Time
assistance data IE.
The time of applicability of time assistance is the beginning of the System Frame of the message containing the GPS
Reference time.
ETSI
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3GPP TS 25.171 version 15.0.0 Release 15 9 ETSI TS 125 171 V15.0.0 (2018-07)
4.4.1 Use of fine time assistance
The use of fine time assistance to improve the GPS performance of the UE is optional for the UE, even when fine time
assistance is signalled by the network. Thus, there are a set minimum performance requirements defined for all UEs and
additional minimum performance requirements that are valid for fine time assistance capable UEs only. These
requirements are specified in subclause 5.1.2.
4.5 RRC states
The minimum A-GPS performance requirements are specified in clause 5 for different RRC states that include
Cell_DCH and Cell_FACH. Cell_PCH and URA_PCH states are for further study. The test and verification procedures
are separately defined in annex B.
4.6 2D position error
The 2D position error is defined by the horizontal difference in meters between the ellipsoid point reported or calculated
from the UE Measurement Report and the actual position of the UE in the test case considered.
5 A-GPS minimum performance requirements
The A-GPS minimum performance requirements are defined by assuming that all relevant and valid assistance data is
received by the UE in order to perform GPS measurements and/or position calculation. This clause does not include nor
consider delays occurring in the various signalling interfaces of the network.
In the following subclauses the minimum performance requirements are based on availability of the assistance data
information and messages defined in annexes D and E.
The requirements in CELL_PCH and URA_PCH states are for further study.
5.1 Sensitivity
A sensitivity requirement is essential for verifying the performance of A-GPS receiver in weak satellite signal
conditions. In order to test the most stringent signal levels for the satellites the sensitivity test case is performed in
AWGN channel. This test case verifies the performance of the first position estimate, when the UE is provided with
only coarse time assistance and when it is additionally supplied with fine time assistance.
5.1.1 Coarse time assistance
In this test case 8 satellites are generated for the terminal. AWGN channel model is used.
Table 1: Test parameters
Parameters Unit Value
Number of generated satellites - 8
HDOP Range - 1.1 to 1.6
Propagation conditions - AWGN
GPS Coarse time assistance error seconds
±2
range
GPS Signal for one satellites dBm -142
GPS Signal for remaining satellites dBm -147
5.1.1.1 Minimum Requirements (Coarse time assistance)
The position estimates shall meet the accuracy and response time specified in table 2.
Table 2: Minimum requirements (coarse time assistance)
Success rate 2-D position error Max response time
95 % 100 m 20 s
ETSI
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3GPP TS 25.171 version 15.0.0 Release 15 10 ETSI TS 125 171 V15.0.0 (2018-07)
5.1.2 Fine time assistance
This requirement is only valid for fine time assistance capable UEs. In this requirement 8 satellites are generated for the
terminal. AWGN channel model is used.
Table 3: Test parameters for fine time assistance capable terminals
Parameters Unit Value
Number of generated satellites - 8
HDOP Range - 1.1 to 1.6
Propagation conditions - AWGN
GPS Coarse time assistance error range seconds
±2
GPS Fine time assistance error range
μs ±10
GPS Signal for all satellites dBm -147
5.1.2.1 Minimum Requirements (Fine time assistance)
The position estimates shall meet the accuracy and response time requirements in table 4.
Table 4: Minimum requirements for fine time assistance capable terminals
Success rate 2-D position error Max response time
95 % 100 m 20 s
5.2 Nominal Accuracy
Nominal accuracy requirement verifies the accuracy of A-GPS position estimate in ideal conditions. The primarily aim
of the test is to ensure good accuracy for a position estimate when satellite signal conditions allow it. This test case
verifies the performance of the first position estimate.
In this requirement 8 satellites are generated for the terminal. AWGN channel model is used.
Table 5: Test parameters
Parameters Unit Value
Number of generated satellites - 8
HDOP Range - 1.1 to 1.6
Propagation conditions - AWGN
GPS Coarse time assistance error seconds
±2
range
GPS Signal for all satellites dBm -130
5.2.1 Minimum requirements (nominal accuracy)
The position estimates shall meet the accuracy and response time requirements in table 6.
Table 6: Minimum requirements
Success rate 2-D position error Max response time
95 % 30 m 20 s
5.3 Dynamic Range
The aim of a dynamic range requirement is to ensure that a GPS receiver performs well when visible satellit
...