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3GPP (SA2)
TS 03.71














Location Services (LCS) – Functional Description – Stage 2

(P) GSM Rel-99 v8.9.0    2004/06    112 p.
(P) GSM Rel-98 v7.11.0    2004/06    111 p.

Rapporteur:  BROOK, Richard
Descendant(s):  TS 23.171    
See also:  LCS-related TS/TR    

This TS defines the stage-2 service description for the LoCation Services (LCS) feature on GSM, which provides the mechanisms to support mobile location services of operators, which are not covered by standardized GSM services.

The LCS feature is a network feature and not a supplementary service. This version of the stage 2 service description covers aspects of LCS e.g., the functional model, architecture, positioning methods, message flows etc.

1   Scope   PDF-p. 9
2   References
3   Definitions, abbreviations and symbols   PDF-p. 10
4   Main concepts
5   General LCS architecture
5.1   LCS access interfaces and reference points
5.2   LCS Functional diagram   PDF-p. 14
5.3   LCS CLIENT   PDF-p. 15
5.4   LCS Server
5.5   Information Flows between Client and Server      Up
5.6   Logical architecture
5.7   Embedded Architecture
5.8   Assignment of functions to general logical architecture   PDF-p. 23
6   Signalling Protocols and Interfaces
7   General Network Location Procedures   PDF-p. 31      Up
7.1   State Description for the GMLC
7.2   State Description for the VMSC      Up
7.3   State Description for the BSC
7.4   State Description for the SMLC   PDF-p. 35
7.5   Usage of SCCP Connections on the Ls and Lb interfaces
7.6   General Network Positioning Procedures
7.6.1   Mobile Terminating Location Request (MT-LR)   PDF-p. 38
7.6.2   MT-LR without HLR Query - applicable to North America Emergency Calls only
7.6.3   MT-LR for a previously obtained location estimate   PDF-p. 41      Up
7.6.4   Network Induced Location Request (NI-LR)      Up
7.6.4A   NI-LR using Location Based Routing – applicable to North American Emergency Calls only   PDF-p. 45
7.6.5   Network Induced Location Request (NI-LR) from a Serving BSC for a target MS in dedicated mode   PDF-p. 47
7.6.6   Mobile Originating Location Request (MO-LR)
7.7   Common Procedures to Support Positioning   PDF-p. 51
7.8   Common Procedures to Support Access to an LMU
7.9   Common Control Procedures for LMUs
7.10   Common Procedures supporting Interaction between Peer SMLCs   PDF-p. 64
7.11   Exception Procedures   PDF-p. 65
7.12   Privacy   PDF-p. 69
7.13   Mobile Originating Location   PDF-p. 71
7.14   CM Procedures
7.15   Radio Interface Timing Procedures   PDF-p. 72
8   TA based Positioning   PDF-p. 73
9   TOA based positioning   PDF-p. 76
10   E-OTD and GPS Positioning Procedures   PDF-p. 80
11   Position calculation functionality   PDF-p. 90
12   Information storage   PDF-p. 91      Up
13   Operational Aspects
A   Examples of MT-LR   PDF-p. 98
B   Description of TOA   PDF-p. 101
C   Description of E-OTD   PDF-p. 102
D   Description Of Assisted GPS   PDF-p. 105
E   Privacy class selection rule   PDF-p. 109
F   Change History   PDF-p. 110