ETSI TS 136 171 V15.1.0 (2020-04)

ETSI TS 136 171 V15.1.0 (2020-04)






TECHNICAL SPECIFICATION
LTE;
Evolved Universal Terrestrial Radio Access (E-UTRA);
Requirements for Support of Assisted Global Navigation
Satellite System (A-GNSS)
(3GPP TS 36.171 version 15.1.0 Release 15)

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3GPP TS 36.171 version 15.1.0 Release 15 1 ETSI TS 136 171 V15.1.0 (2020-04)



Reference
RTS/TSGR-0436171vf10
Keywords
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3GPP TS 36.171 version 15.1.0 Release 15 2 ETSI TS 136 171 V15.1.0 (2020-04)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
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Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
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Legal Notice
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. These shall be
interpreted as being references to the corresponding ETSI deliverables.
The cross reference between 3GPP and ETSI identities can be found under http://webapp.etsi.org/key/queryform.asp.
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 36.171 version 15.1.0 Release 15 3 ETSI TS 136 171 V15.1.0 (2020-04)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 5
1 Scope . 7
2 References . 7
3 Definitions, symbols and abbreviations . 8
3.1 Definitions . 8
3.2 Symbols . 8
3.3 Abbreviations . 8
3.4 Test tolerances . 9
4 General . 9
4.1 Introduction . 9
4.1.1 Applicability of requirements in this specification version . 9
4.2 Measurement parameters . 10
4.2.1 UE based A-GNSS measurement parameters . 10
4.2.2 UE assisted A-GNSS measurement parameters . 10
4.3 Response time . 10
4.4 Time assistance . 10
4.4.1 Use of fine time assistance . 10
4.5 RRC states . 11
4.6 Error definitions . 11
5 A-GNSS minimum performance requirements (UE supports A-GPS L1 C/A only) . 11
5.1 Sensitivity . 12
5.1.1 Coarse time assistance . 12
5.1.1.1 Minimum Requirements (Coarse time assistance) . 12
5.1.2 Fine time assistance . 12
5.1.2.1 Minimum Requirements (Fine time assistance) . 12
5.2 Nominal Accuracy . 13
5.2.1 Minimum requirements (nominal accuracy) . 13
5.3 Dynamic Range . 13
5.3.1 Minimum requirements (dynamic range) . 14
5.4 Multi-Path scenario . 14
5.4.1 Minimum Requirements (multi-path scenario) . 14
5.5 Moving scenario and periodic update . 14
5.5.1 Minimum Requirements (moving scenario and periodic update) . 15
6 A-GNSS minimum performance requirements (UE supports other or additional GNSSs) . 15
6.1 Sensitivity . 16
6.1.1 Coarse time assistance . 16
6.1.1.1 Minimum Requirements (Coarse time assistance) . 16
6.1.2 Fine time assistance . 17
6.1.2.1 Minimum Requirements (Fine time assistance) . 17
6.2 Nominal Accuracy . 17
6.2.1 Minimum requirements (nominal accuracy) . 18
6.3 Dynamic Range . 18
6.3.1 Minimum requirements (dynamic range) . 19
6.4 Multi-Path scenario . 19
6.4.1 Minimum Requirements (multi-path scenario) . 20
6.5 Moving scenario and periodic update . 20
6.5.1 Minimum Requirements (moving scenario and periodic update) . 21
Annex A (normative): Test cases . 22
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A.1 Conformance tests . 22
A.2 Requirement classification for statistical testing . 22
Annex B (normative): Test conditions. 23
B.1 General . 23
B.1.1 Parameter values . 23
B.1.2 Time assistance . 23
B.1.3 GNSS Reference Time . 23
B.1.4 Reference and UE locations . 24
B.1.5 Satellite constellation and assistance data . 24
B.1.5.1 UE supports A-GPS L1 C/A only . 24
B.1.5.2 UE supports other A-GNSSs . 24
B.1.6 Atmospheric delays . 24
B.1.7 E-UTRA Frequency and frequency error . 24
B.1.8 Information elements . 25
B.1.9 GNSS signals . 25
B.1.10 RESET UE POSITIONING STORED INFORMATION Message . 25
B.1.11 GNSS System Time Offsets . 25
B.1.12 Sensors . 25
Annex C (normative): Propagation conditions . 26
C.1 Static propagation conditions . 26
C.2 Multi-path Case . 26
Annex D (normative): Measurement sequence chart . 27
D.1 General . 27
D.2 TTFF Measurement Sequence Chart . 27
D.3 Moving Scenario And Periodic Update Measurement Sequence Chart . 28
Annex E (normative): Assistance data required for testing . 31
E.1 Introduction . 31
E.2 GNSS Assistance Data . 31
Annex F (normative): Converting UE-assisted measurement reports into position
estimates . 35
F.1 Introduction . 35
F.2 UE measurement reports . 35
F.3 WLS position solution . 36
Annex G (informative): Change history . 38
History . 39

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Foreword
This Technical Specification has been produced by the 3rd 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.
In the present document, modal verbs have the following meanings:
shall indicates a mandatory requirement to do something
shall not indicates an interdiction (prohibition) to do something
The constructions "shall" and "shall not" are confined to the context of normative provisions, and do not appear in
Technical Reports.
The constructions "must" and "must not" are not used as substitutes for "shall" and "shall not". Their use is avoided
insofar as possible, and they are not used in a normative context except in a direct citation from an external, referenced,
non-3GPP document, or so as to maintain continuity of style when extending or modifying the provisions of such a
referenced document.
should indicates a recommendation to do something
should not indicates a recommendation not to do something
may indicates permission to do something
need not indicates permission not to do something
The construction "may not" is ambiguous and is not used in normative elements. The unambiguous constructions
"might not" or "shall not" are used instead, depending upon the meaning intended.
can indicates that something is possible
cannot indicates that something is impossible
The constructions "can" and "cannot" are not substitutes for "may" and "need not".
will indicates that something is certain or expected to happen as a result of action taken by an
agency the behaviour of which is outside the scope of the present document
will not indicates that something is certain or expected not to happen as a result of action taken by an
agency the behaviour of which is outside the scope of the present document
might indicates a likelihood that something will happen as a result of action taken by some agency the
behaviour of which is outside the scope of the present document
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might not indicates a likelihood that something will not happen as a result of action taken by some agency
the behaviour of which is outside the scope of the present document
In addition:
is (or any other verb in the indicative mood) indicates a statement of fact
is not (or any other negative verb in the indicative mood) indicates a statement of fact
The constructions "is" and "is not" do not indicate requirements.
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3GPP TS 36.171 version 15.1.0 Release 15 7 ETSI TS 136 171 V15.1.0 (2020-04)
1 Scope
The present document establishes the minimum performance requirements for A-GNSS (including A-GPS) for FDD or
TDD mode of E-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 36.101: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE)
radio transmission and reception".
[2] 3GPP TS 36.104: "Evolved Universal Terrestrial Radio Access (E-UTRA); Base Station (BS)
radio transmission and reception".
[3] 3GPP TS 37.571-1: " User Equipment (UE) conformance specification for UE positioning; Part 1:
Terminal conformance".
[4] 3GPP TS 36.355: "Evolved Universal Terrestrial Radio Access (E-UTRA); LTE Positioning
Protocol (LPP)".
[5] 3GPP TS 36.302: "Evolved Universal Terrestrial Radio Access (E-UTRA); Services provided by
the physical layer".
[6] 3GPP TS 36.214: "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer;
Measurements".
[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".
th
[8] IS-GPS-200, Revision D, Navstar GPS Space Segment/Navigation User Interfaces, March 7 ,
2006.
[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 36.509: "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Packet
Core (EPC); Special conformance testing functions for User Equipment (UE)".
[12] IS-GPS-705, Navstar GPS Space Segment/User Segment L5 Interfaces, September 22, 2005.
[13] IS-GPS-800, Navstar GPS Space Segment/User Segment L1C Interfaces, September 4, 2008.
[14] IS-QZSS, Quasi Zenith Satellite System Navigation Service Interface Specifications for QZSS,
Ver.1.1, July 31, 2009.
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rd
[15] Galileo OS Signal in Space ICD (OS SIS ICD), Draft 0, Galileo Joint Undertaking, May 23 ,
2006.
[16] Global Navigation Satellite System GLONASS Interface Control Document, Version 5.1, 2008.
[17] Specification for the Wide Area Augmentation System (WAAS), US Department of
Transportation, Federal Aviation Administration, DTFA01-96-C-00025, 2001.
[18] BeiDou Navigation Satellite System Signal In Space Interface Control Document Open Service
Signal B1I(Version 1.0), China Satellite Navigation Office, December 2012.
[19] 3GPP TS 36.306: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE)
radio access capabilities".

3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in 3GPP TS 36.101 [1], 3GPP TS 36.104 [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
3.2 Symbols
For the purposes of the present document, the following symbols apply:
B1I BeiDou B1I navigation signal with carrier frequency of 1561.098 MHz.
E1 Galileo E1 navigation signal with carrier frequency of 1575.420 MHz.
E5 Galileo E5 navigation signal with carrier frequency of 1191.795 MHz.
E6 Galileo E6 navigation signal with carrier frequency of 1278.750 MHz.
G1 GLONASS navigation signal in the L1 sub-bands with carrier frequencies 1602 MHz ± k × 562.5
kHz.
G2 GLONASS navigation signal in the L2 sub-bands with carrier frequencies 1246 MHz ± k × 437.5
kHz.
k GLONASS channel number, k = -7…13.
L1 C/A GPS or QZSS L1 navigation signal carrying the Coarse/Acquisition code with carrier frequency of
1575.420 MHz.
L1C GPS or QZSS L1 Civil navigation signal with carrier frequency of 1575.420 MHz.
L2C GPS or QZSS L2 Civil navigation signal with carrier frequency of 1227.600 MHz.
L5 GPS or QZSS L5 navigation signal with carrier frequency of 1176.450 MHz.
G Geometry Matrix.
ρ
GNSS ,i
m
Measured pseudo-range of satellite i of GNSS .
m
W Weighting Matrix.
1
GNSS ,i
m
Line of sight unit vector from the user to the satellite i of GNSS .
m
x
State vector of user position and clock bias.

3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
A-GNSS Assisted Global Navigation Satellite System
A-GPS Assisted - Global Positioning System
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AWGN Additive White Gaussian Noise
BDS BeiDou Navigation Satellite System
C/A Coarse/Acquisition
DUT Device Under Test
ECEF Earth Centred, Earth Fixed
ECI Earth-Centered-Inertial
E-SMLC Enhanced Serving Mobile Location Centre
E-UTRA Evolved UMTS Terrestrial Radio Access
E-UTRAN Evolved UMTS Terrestrial Radio Access Network
eNB E-UTRAN Node B
FDD Frequency Division Duplex
GEO Geostationary Earth Orbit
GLONASS GLObal'naya NAvigatsionnaya Sputnikovaya Sistema (Engl.: Global Navigation Satellite System)
GNSS Global Navigation Satellite System
GPS Global Positioning System
GSS GPS System Simulator
HDOP Horizontal Dilution Of Precision
ICD Interface Control Document
IGSO Inclined Geosynchronous Satellite Orbit
IS Interface Specification
LOS Line Of Sight
LPP LTE Positioning Protocol
MEO Medium Earth Orbit
QZSS Quasi-Zenith Satellite System
RRC Radio Resource Control
SBAS Space Based Augmentation System
SFN System Frame Number
SS FDD System simulator
SV Space Vehicle
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
WLS Weighted Least Square
WGS-84 World Geodetic System 1984
3.4 Test tolerances
The requirements given in the present document make no allowance for measurement uncertainty. The test specification
3GPP TS 37.571-1 [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 or
TDD A-GNSS (including A-GPS) terminals.
4.1.1 Applicability of requirements in this specification version
For UE category M1 and UE category M2, unless otherwise stated, A-GNSS minimum performance requirements in
Section 5 and 6 are applicable only to UEs supporting VoLTE. UE Category M1, comprising both DL UE category M1
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3GPP TS 36.171 version 15.1.0 Release 15 10 ETSI TS 136 171 V15.1.0 (2020-04)
and UL UE category M1, is defined in TS 36.306 [19]. UE Category M2, comprising both DL UE category M2 and UL
UE category M2, is defined in TS 36.306 [19].
4.2 Measurement parameters
4.2.1 UE based A-GNSS measurement parameters
In case of UE-based A-GNSS, the measurement parameters are contained in the GNSS-LocationInformation IE which is
included in the A-GNSS-ProvideLocationInformation IE provided in the LPP message of type PROVIDE LOCATION
INFORMATION. The measurement parameter in case of UE-based A-GNSS is the horizontal position estimate
reported by the UE and expressed in latitude/longitude.
4.2.2 UE assisted A-GNSS measurement parameters
In case of UE-assisted A-GNSS, the measurement parameters are contained in the
GNSS-SingnalMeasurementInformation IE which is included in the A-GNSS-ProvideLocationInformation IE provided
in the LPP message of type PROVIDE LOCATION INFORMATION. The measurement parameters in case of UE-
assisted A-GNSS are the UE GNSS code phase measurements, as specified in 3GPP TS 36.302 [5] and 3GPP
...