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TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
Location Services (LCS);
LCS Application Protocol (LCS-AP)
between the Mobile Management Entity (MME)
and Evolved Serving Mobile Location Centre (E-SMLC);
SLs interface
(3GPP TS 29.171 version 15.0.0 Release 15)
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3GPP TS 29.171 version 15.0.0 Release 15 1 ETSI TS 129 171 V15.0.0 (2018-07)
Reference
RTS/TSGC-0429171vf00
Keywords
GSM,LTE,UMTS
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ETSI
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3GPP TS 29.171 version 15.0.0 Release 15 2 ETSI TS 129 171 V15.0.0 (2018-07)
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
server (https://ipr.etsi.org/).
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
server) which are, or may be, or may become, essential to the present document.
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ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
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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 29.171 version 15.0.0 Release 15 3 ETSI TS 129 171 V15.0.0 (2018-07)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 6
1 Scope . 7
2 References . 7
3 Definitions and abbreviations . 8
3.1 Definitions . 8
3.2 Abbreviations . 8
4 Functional Overview . 8
4.1 General . 8
5 LCS-AP Message Transport . 9
5.1 General . 9
5.2 Protocol Layering . 9
5.3 Usage of SCTP Associations . 10
6 LCS-AP Procedures . 10
6.1 General . 10
6.2 Procedures Applicable to LCS-AP . 10
6.2.1 Location Service Request . 10
6.2.1.1 General . 10
6.2.1.2 Successful Operation . 10
6.2.1.3 Unsuccessful Operation . 12
6.2.2 Location Information Exchange . 12
6.2.2.1 Connection Oriented Information Transfer . 12
6.2.2.1.1 General . 12
6.2.2.1.2 Successful Operation . 12
6.2.2.1.3 Abnormal Conditions . 13
6.2.2.2 Connectionless Information Transfer . 13
6.2.2.2.1 General . 13
6.2.2.2.2 Successful Operation . 13
6.2.2.2.3 Unsuccessful Operation . 14
6.2.2.2.4 Abnormal Conditions . 14
6.2.3 Ciphering Keys Delivery . 14
6.2.3.1 General . 14
6.2.3.2 Successful Operation . 14
6.2.3.3 Unsuccessful Operation . 15
6.3 Exception Procedures . 15
6.3.1 Location Abort . 15
6.3.1.1 General . 15
6.3.1.2 Normal Operation . 15
6.3.1.3 Abnormal Conditions . 15
6.3.2 Reset . 15
6.3.2.1 General . 15
6.3.2.2 Normal Operation . 16
6.3.2.3 Abnormal Conditions . 16
6.4 Error Handling . 16
6.4.1 Abnormal Conditions . 16
6.4.2 Overload . 16
7 LCS-AP Messages and Message Formats . 17
7.1 General . 17
7.2 Message Formats . 17
7.3 LCS-AP Messages . 17
ETSI
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3GPP TS 29.171 version 15.0.0 Release 15 4 ETSI TS 129 171 V15.0.0 (2018-07)
7.3.1 LCS-AP Location Request message . 17
7.3.2 LCS-AP Location Response message . 18
7.3.3 LCS-AP Location Abort Request message . 19
7.3.4 LCS-AP Connection Oriented Information message . 19
7.3.5 LCS-AP Connectionless Information message . 19
7.3.6 LCS-AP Reset Request message . 20
7.3.7 LCS-AP Reset Acknowledge message . 20
7.3.8 LCS-AP Ciphering Key Data message . 20
7.3.9 LCS-AP Ciphering Key Data Result message . 20
7.4 Information Elements . 21
7.4.1 General . 21
7.4.2 Message Type . 21
7.4.3 Location Type . 21
7.4.4 E-CGI . 21
7.4.5 LCS Client Type . 22
7.4.6 LCS Priority . 22
7.4.7 LCS QoS . 22
7.4.8 UE Positioning Capability . 23
7.4.9 Include Velocity . 23
7.4.10 IMSI . 23
7.4.11 IMEI. 24
7.4.12 Geographic Area . 25
7.4.13 Positioning Data . 27
7.4.14 Velocity Estimate . 31
7.4.15 Accuracy Fulfilment Indicator . 31
7.4.16 LCS Cause . 32
7.4.17 Payload Type . 33
7.4.18 APDU . 33
7.4.19 Network Element . 33
7.4.20 Return Error Request . 33
7.4.21 Return Error Cause . 33
7.4.22 Altitude and direction . 34
7.4.23 Geographical Coordinates . 34
7.4.24 Uncertainty Ellipse . 35
7.4.25 Horizontal Speed and Bearing . 35
7.4.26 Vertical Velocity . 35
7.4.27 PLMN Identity . 36
7.4.28 Correlation ID . 36
7.4.29 eNB ID . 37
7.4.30 LCS Service Type ID . 37
7.4.31 Cell Portion ID . 37
7.4.32 Civic Address. 37
7.4.33 Barometric Pressure . 38
7.4.34 RAT Type . 38
7.4.35 Coverage Level . 38
7.4.36 Ciphering Data . 38
7.4.37 Ciphering Data Ack . 39
7.4.38 Ciphering Data Error Report . 39
7.4.39 Ciphering Data Set . 39
7.4.40 Ciphering Data Error Report Contents. 43
7.5 Message and information element abstract syntax . 43
7.5.1 General . 43
7.5.2 Usage of protocol extension mechanism for non-standard use . 44
7.5.3 Elementary procedure definitions . 44
7.5.4 PDU definitions . 46
7.5.5 Information element definitions . 51
7.5.6 Common definitions . 59
7.5.7 Constant definitions . 59
7.5.8 Container Definitions . 60
7.5.9 Message transfer syntax . 62
7.6 Handling of unknown, unforeseen and erroneous protocol data . 62
ETSI
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3GPP TS 29.171 version 15.0.0 Release 15 5 ETSI TS 129 171 V15.0.0 (2018-07)
8 LCS-AP Timers . 62
8.1 General . 62
8.2 Timers of LCS-AP. 62
Annex A (informative): Change history . 63
History . 64
ETSI
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3GPP TS 29.171 version 15.0.0 Release 15 6 ETSI TS 129 171 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 29.171 version 15.0.0 Release 15 7 ETSI TS 129 171 V15.0.0 (2018-07)
1 Scope
The present document specifies the procedures and information coding for LCS Application Protocol (LCS-AP) that is
needed to support the location services in E-UTRAN. The LCS-AP message set is applicable to the SLs interface
between the E-SMLC and the MME. LCS-AP is developed in accordance to the general principles stated in 3GPP TS
23.271 [3].
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 TR 21.905: "Vocabulary for 3GPP Specifications".
[2] 3GPP TS 36.305: "Stage 2 functional specification of User Equipment (UE) positioning in E-
UTRAN".
[3] 3GPP TS 23.271: "Functional stage 2 description of Location Services (LCS)".
[4] IETF RFC 4960: "Stream Control Transmission Protocol".
[5] TIA/EIA/IS-J-STD-036 (2000): "Wireless Enhanced Emergency Services".
[6] 3GPP TS 23.032: "Universal Geographical Area Description (GAD)".
[7] 3GPP TS 36.413: "S1 Application Protocol (S1AP)".
[8] ITU-T Recommendation X.680 (07/2002): "Information Technology - Abstract Syntax Notation
One (ASN.1): Specification of basic notation".
[9] ITU-T Recommendation X.681 (07/2002): "Information Technology - Abstract Syntax Notation
One (ASN.1): Information object specification".
[10] 3GPP TS 22.071: "Location Services (LCS); Service Description; Stage1".
[11] 3GPP TS 23.003: "Numbering, addressing and identification".
[12] ITU-T Recommendation X.691 (07/2002): "Information Technology - ASN.1 encoding rules -
Specification of Packed Encoding Rules (PER)".
[13] IETF RFC 4119: "A Presence-based GEOPRIV Location Object Format".
[14] IETF RFC 5139: "Revised Civic Location Format for Presence Information Data Format Location
Object".
[15] IETF RFC 6848: "Specifying Civic Address Extensions in the Presence Information Data Format
Location Object (PIDF-LO)".
[16] IETF RFC 5905: "Network Time Protocol Version 4: Protocol and Algorithms Specification".
[17] 3GPP TS 24.301: "Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage
3".
ETSI
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3GPP TS 29.171 version 15.0.0 Release 15 8 ETSI TS 129 171 V15.0.0 (2018-07)
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in TR 21.905 [1] and the following apply. A
term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 [1].
Elementary Procedure: LCS-AP protocol consists of Elementary Procedures (EPs). An LCS-AP Elementary
Procedure is a unit of interaction between the MME and the E-SMLC. An EP consists of an initiating message and
possibly a response message. Two kinds of EPs are used:
- Class 1: Elementary Procedures with response (success or failure),
- Class 2: Elementary Procedures without response.
3.2 Abbreviations
For the purposes of the present document, the abbreviations given in TR 21.905 [1] and the following apply. An
abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in
TR 21.905 [1].
CID Cell-ID (positioning method)
E-CID Enhanced Cell-ID (positioning method)
E-SMLC Enhanced Serving Mobile Location Centre
E-UTRAN Envolved Universal Terrestrial Radio Access Network
GNSS Global Navigation Satellite System
GPS Global Positioning System
LCS LoCation Services
LCS-AP LCS Application Protocol
LPP LTE Positioning Protocol
LPPa LTE Positioning Protocol Annex
LTE Long Term Evolution
MBS Metropolitan Beacon System
MO-LR Mobile Originated Location Request
MT-LR Mobile Terminated Location Request
NI-LR Network Induced Location Request
MME Mobility Management Entity
OTDOA Observed Time Difference Of Arrival
PDU Protocol Data Unit
SCTP Stream Control Transmission Protocol
SET SUPL Enabled Terminal
SLP SUPL Location Platform
SUPL Secure User Plane Location
TA Timing Advance
...