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TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
Functional stage 2 description of Location Services (LCS)
(3GPP TS 23.271 version 15.0.0 Release 15)
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3GPP TS 23.271 version 15.0.0 Release 15 1 ETSI TS 123 271 V15.0.0 (2018-07)
Reference
RTS/TSGS-0223271vf00
Keywords
GSM,LTE,UMTS
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3GPP TS 23.271 version 15.0.0 Release 15 2 ETSI TS 123 271 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
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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 23.271 version 15.0.0 Release 15 3 ETSI TS 123 271 V15.0.0 (2018-07)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 9
1 Scope . 10
2 References . 10
3 Definitions, symbols and abbreviations . 12
3.1 Definitions . 12
3.2 Symbols . 16
3.3 Abbreviations . 16
4 Main concepts . 20
4.1 Assumptions . 20
4.2 Location Services Categories . 21
4.3 Positioning methods . 21
4.3.1 Standard LCS Methods in UTRAN . 21
4.3.2 Standard LCS Methods in GERAN . 22
4.3.3 Standard LCS Methods in E-UTRAN . 22
4.4 Types of Location Request . 22
4.4.1 Immediate Location Request . 22
4.4.2 Deferred Location Request . 22
4.4.2.1 Types of event . 22
4.5 Concurrent Location Requests . 23
5 General LCS architecture . 24
5.1 LCS access interfaces . 24
5.2 LCS Functional diagram, high level functions . 25
5.3 LCS Client functional group . 26
5.3.1 External Location Client Function (LCF) . 26
5.4 LCS Server functional group . 26
5.4.1 Client handling component . 26
5.4.1.1 Location Client Control Function (LCCF) . 26
5.4.1.2 Location Client Authorization Function (LCAF) . 26
5.4.1.2.1 Access Subfunction . 26
5.4.1.2.2 Subscription Subfunction . 26
5.4.1.3 Location Client Co-ordinate Transformation Function (LCCTF) . 27
5.4.1.4 Location Client Zone Transformation Function (LCZTF) . 27
5.4.2 System handling component . 27
5.4.2.1 Location System Control Function(LSCF) . 27
5.4.2.2 Location System Billing Function (LSBF) . 27
5.4.2.3 Location System Operations Function (LSOF) . 27
5.4.2.4 Location System Broadcast Function (LSBcF) . 28
5.4.2.5 Location System Co-ordinate Transformation Function (LSCTF) . 28
5.4.2.6 Location IMS – Interworking Function (LIMS-IWF) . 28
5.4.3 Subscriber handling Component . 28
5.4.3.1 Location Subscriber Authorization Function (LSAF) . 28
5.4.3.2 Location Subscriber Translation Function (LSTF) . 28
5.4.3.3 Location Subscriber Privacy Function (LSPF). 28
5.4.4 Positioning components . 28
5.5 Information Flows between Client and Server . 28
5.5.1 Location Service Request . 29
5.5.2 Location Service Response . 30
5.6 Information Flows between LCS Servers . 31
5.6.1 Location Service Request . 31
5.6.2 Location Service Response . 33
5.7 Optimized Lgd Procedure . 33
ETSI
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3GPP TS 23.271 version 15.0.0 Release 15 4 ETSI TS 123 271 V15.0.0 (2018-07)
6 LCS Architecture . 34
6.0 Introduction . 34
6.1 Schematic functional description of LCS operations . 37
6.2 Allocation of LCS functions to network elements . 38
6.3 Functional description of LCS per network element . 41
6.3.1 Access Network . 41
6.3.2 LCS Clients, LCS applications and Requestors . 42
6.3.3 Gateway Mobile Location Centre, GMLC . 42
6.3.3A Location Retrieval Function, LRF . 43
6.3.4 LCS support in the UE . 43
6.3.5 MSC/VLR . 43
6.3.6 MSC Server . 43
6.3.7 SGSN . 43
6.3.8 Home Location Register, HLR . 44
6.3.9 HSS . 44
6.3.10 gsmSCF . 44
6.3.11 Privacy Profile Register, PPR . 44
6.3.12 Pseudonym Mediation Device, PMD. 44
6.3.13 Mobility Management Entity, MME . 44
6.3.14 Evolved Serving Mobile Location Centre, E-SMLC . 44
6.4 Addressing the target UE for LCS purposes . 45
6.4.1 Verinyms for the target UE . 45
6.4.2 Pseudonyms for the target UE . 45
6.4.3 Non-dialable callback numbers . 45
6.5 Quality of Service Information . 45
6.5.1 LCS QoS Class . 45
6.5.1.1 Best Effort Class . 46
6.5.1.2 Assured Class . 46
7 Signalling and Interfaces . 46
7.1 LCS signalling between Access and Core Networks for GERAN and UTRAN access networks . 46
7.1.1 Core network Location Request. 46
7.1.2 Location Report . 46
7.1a LCS signalling between Access and Core Networks for E-UTRAN access networks . 46
7.1a.1 Core network Measurement Request . 47
7.1a.2 Location Measurement Report . 47
7.2 Um, Uu and Uu-LTE Interfaces . 47
7.3 MAP Interfaces . 47
7.4 Lpp interface . 48
7.4.1 LCS Authorisation Request . 48
7.4.2 LCS Authorisation Response . 49
7.4.3 LCS Privacy Profile Update notification . 49
7.4.4 LCS Privacy Profile Update notification ack . 50
7.5 Lid interface . 50
7.5.1 LCS Identity Request . 50
7.5.2 LCS Identity Response . 50
7.6 IMS related Interfaces . 50
7.6.1 Dh Interface . 50
7.6.2 Sh Interface . 50
7.6.3 Ml Interface . 50
7.7 SLg Interface . 50
7.8 SLs Interface . 50
7.9 SLh Interface . 51
7.10 SLm Interface . 51
7.11 Lgd Interface . 51
8 General network location procedures . 51
8.1 State description for GMLC . 51
8.1.1 GMLC states . 51
8.1.1.1 NULL State . 51
8.1.1.2 INTERROGATION State . 51
8.1.1.3 LOCATION State . 51
ETSI
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3GPP TS 23.271 version 15.0.0 Release 15 5 ETSI TS 123 271 V15.0.0 (2018-07)
8.1.2 State functionality . 52
8.1.2.1 State Transitions . 52
8.1.2.2 INTERROGATION Timer Function . 52
8.1.2.3 LOCATION Timer Function . 52
8.2 State description for VMSC and MSC Server . 53
8.2.1 VMSC and MSC Server States . 53
8.2.1.1 LCS IDLE State . 53
8.2.1.2 LOCATION State . 53
8.2.2 State Functionality . 53
8.2.2.1 State Transitions . 53
8.2.2.2 LOCATION Timer Function . 53
8.3 LCS State description for SGSN . 54
8.3.1 SGSN States. 54
8.3.1.1 LCS IDLE State . 54
8.3.1.2 LOCATION State . 54
8.3.2 State Functionality . 54
8.3.2.1 State Transitions . 54
8.3.2.2 LOCATION Timer Function . 54
8.4 Signalling connection for the Iu interface . 54
8.5 Signalling connection for the A-interface . 55
8.6 Gb interface mapping of target UE. 55
8.7 LCS State description for MME . 55
8.7.1 MME States . 55
8.7.1.1 LCS IDLE State . 55
8.7.1.2 LOCATION State . 55
8.7.2 State Functionality . 55
8.7.2.1 State Transitions . 55
8.7.2.2 LOCATION Timer Function . 56
8.8 Signalling connection for the S1 interface . 56
9 General Network Positioning Procedures . 56
9.1 Mobile Terminating Location Request . 56
9.1.1 Common MT-LR procedure in PS and CS domain . 57
9.1.1A Common MT-LR procedure in PS and CS domain for Emergency MT-LR . 61
9.1.1.1 LCS Authorisation request . 63
9.1.1.2 LCS Privacy Profile Update . 64
9.1.1.3 LCS identity request . 64
9.1.2 Circuit Switched Mobile Terminating Location Request (CS-MT-LR) . 65
9.1.2.1 Location Preparation Procedure . 66
9.1.2.2 Positioning Measurement Establishment Procedure . 67
9.1.2.3 Location Calculation and Release Procedure . 67
9.1.3 CS-MT-LR without HLR Query . 67
9.1.4 CS-MT-LR and PS-MT-LR for a previously obtained location estimate . 68
9.1.4.1 Initial Location . 69
9.1.4.2 Current Location . 69
9.1.4.3 Last known Location .
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