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TR 23.909 (CT4)
Technical report on the Gateway Location Register

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V4.0.0 (PDF)    2001/04    62 p.
V3.0.1    2000/05    62 p.

Rapporteur:  Mr. Park, Ian David Chalmers
See also:  –

This TR describes the use of a Gateway Location Register within the UMTS Core Network as a means of reducing the amount of MAP signalling traffic associated with location management carried over inter-PLMN links for roaming users.

One of the requirements of the present document is to describe a network architecture where the presence of a GLR within a UMTS PLMN is not visible to either a second generation PLMN (i.e. GSM release 98 or earlier) or a 3G PLMN (i.e. GSM Release 99 or later). So the objective of this report is that changes to GSM specified interfaces or procedures will not be needed in order to:
  • integrate a GLR into a UMTS PLMN;
  • allow interworking between a GLR-enabled UMTS network and a GSM or UMTS network without a GLR.
This TR will be restricted to the study of the case where the GLR supports one VPLMN only. A separate TR will be required if support of multiple VPLMNs by the GLR is to be studied.

This TR will study support of multiple HPLMNs by the GLR.


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1 Scope    2 References    3 Definitions and abbreviations    3.1 Definitions    3.2 Abbreviations    4 Introduction    5 Roaming Scenarios    5.1 Relationship between GLR and HLR    5.2 Relationship between GLR and VLR    6 Logical Network Model    6.1 GLR    6.2 Intermediate MSC    6.3 Intermediate GSN    6.4 Gate Node    7 Functional Description    7.1 Generic Functions    7.2 Circuit Switched Service    7.3 Packet Switched Service    7.4 Common Procedures    7.5 Short Message Service    7.6 Subscriber and Equipment Trace    7.7 Impact of GLR on CAMEL    7.8 Interaction With CCBS    7.9 Location Service (LCS)    8 Mobile terminating Location Request Subscriber Information    8.1 Information for HLR emulation    8.2 Information for address and identity conversion    8.3 Information for Location updating Screening    8.4 Other Information    8.5 IMSI Record in GLR    9 Percentage reduction of Inter-PLMN MAP traffic    9.1 Case 1: A businessman visits a large city    9.2 Case 2: A tourist visits a large city for shopping    9.3 Location Update    10 Interworking with existing GSM networks    11 Impact on GSM Release 99 Specifications    12 Advantages of the GLR    12.1 Optimisation of MAP Traffic    12.2 Interworking With GSM    13 Drawbacks of the GLR    13.1 Application level analysis of signalling    13.2 Reliability Issues    13.3 Upgrading of GLR capabilities    13.4 Handling of unsupported services    13.5 VLR Location Based Services    14 Open Issues    14.1 Additional signalling load on HLR restart    A Change history   


1   Scope   PDF-p. 6
2   References
3   Definitions and abbreviations
4   Introduction   PDF-p. 7
5   Roaming Scenarios
6   Logical Network Model   PDF-p. 8
7   Functional Description
7.1   Generic Functions
7.2   Circuit Switched Service   PDF-p. 11
7.3   Packet Switched Service   PDF-p. 22
7.4   Common Procedures   PDF-p. 35
7.5   Short Message Service      Up
7.6   Subscriber and Equipment Trace      Up
7.7   Impact of GLR on CAMEL
7.8   Interaction With CCBS   PDF-p. 46
7.9   Location Service (LCS)   PDF-p. 47
8   Mobile terminating Location Request Subscriber Information
9   Percentage reduction of Inter-PLMN MAP traffic   PDF-p. 52      Up
10   Interworking with existing GSM networks   PDF-p. 57
11   Impact on GSM Release 99 Specifications
12   Advantages of the GLR   PDF-p. 58      Up
13   Drawbacks of the GLR
14   Open Issues
A   Change history   PDF-p. 60

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