TR 23.909
Technical report on the Gateway Location Register
V4.0.0 (PDF)
2001/04 62 p.
V3.0.1
2000/05 62 p.
- Rapporteur:
- Mr. Park, Ian David Chalmers
full Table of Contents for TR 23.909 Word version: 4.0.0
1 Scope p. 6
The present document 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.
2 References p. 6
3 Definitions and abbreviations p. 6
3.1 Definitions p. 6
3.2 Abbreviations p. 6
4 Introduction p. 7
5 Roaming Scenarios p. 7
6 Logical Network Model p. 8
7 Functional Description p. 9
7.1 Generic Functions p. 9
7.1.1 Message Relay Functions p. 9
7.1.2 Address Conversion Function p. 10
7.1.3 Subscriber Information Caching Function p. 10
7.1.4 Subscriber Information Cancellation Function p. 10
7.1.5 HLR emulation Function p. 10
7.1.6 Location Updating Screening Function p. 10
7.1.7 Location Updating Screening Function p. 10
7.2 Circuit Switched Service p. 11
7.2.1 Location Update Procedure p. 11
7.2.1.1 First Location Updating p. 11
7.2.1.2 Second and further Location Updating p. 12
7.2.1.3 Cancel Location p. 12
7.2.1.4 Rate adaptation in the IWF p. 13
7.2.1.5 Handling of unsupported service p. 16
7.2.1.6 Address Conversion p. 19
7.2.2 Routing Information Interrogation Procedure p. 19
7.2.3 Procedure for GSM/UMTS Message Delivery p. 20
7.3 Packet Switched Service p. 22
7.3.1 Address Conversion Function p. 22
7.3.2 GPRS Attach Procedure involving GLR p. 23
7.3.2.1 New SGSN served by GLR, old SGSN served by HLR p. 23
7.3.2.2 New SGSN and old SGSN served by the same GLR p. 25
7.3.3 Authentication of Subscriber p. 26
7.3.4 Inter SGSN Routeing Area Update p. 27
7.3.5 PDP Context Activation Procedure p. 29
7.4 Common Procedures p. 35
7.4.1 Authentication Information Retrieval Procedure p. 35
7.4.2 Purge MS p. 35
7.4.3 Restart p. 36
7.4.3.1 HLR Restart p. 36
7.4.3.2 VLR Restart p. 36
7.4.3.3 GLR Restart p. 37
7.4.3.4 SGSN Restart p. 39
7.4.3.5 Restoration Indicator p. 39
7.5 Short Message Service p. 39
7.5.1 Short Message Service Mobile Terminated p. 40
7.5.1.1 SMS MT over MSC (successful) p. 40
7.5.1.2 SMS MT over SGSN (successful) p. 41
7.5.1.3 SMS MT over both MSC and SGSN (attempt over MSC successes) p. 41
7.5.1.4 SMS MT over both MSC and SGSN (both attempts fail) p. 42
7.5.2 SMS Alert Procedure initiated by Update Location or Update GPRS Location p. 44
7.5.3 Alternatives for SMS Support Without the IM-MSC entity p. 44
7.5.3.1 Alternative 1 p. 45
7.5.3.2 Alternative 2 p. 45
7.6 Subscriber and Equipment Trace p. 45
7.7 Impact of GLR on CAMEL p. 45
7.8 Interaction With CCBS p. 46
7.9 Location Service (LCS) p. 47
8 Mobile terminating Location Request Subscriber Information p. 47
8.1 Information for HLR emulation p. 48
8.2 Information for address and identity conversion p. 48
8.3 Information for Location updating Screening p. 48
8.4 Other Information p. 49
8.5 IMSI Record in GLR p. 50
9 Percentage reduction of Inter-PLMN MAP traffic p. 52
9.1 Case 1: A businessman visits a large city p. 52
9.1.1 Case 1a: The subscriber arrives at the destination p. 53
9.1.2 Case 1b:The subscriber has already registered as a roaming subscriber p. 54
9.2 Case 2: A tourist visits a large city for shopping p. 54
9.2.1 Case 2a: The subscriber arrives at the destination p. 55
9.2.2 Case 2b: The subscriber has already registered as a roaming subscriber p. 55
9.3 Location Update p. 56
10 Interworking with existing GSM networks p. 57
11 Impact on GSM Release 99 Specifications p. 57
12 Advantages of the GLR p. 58
13 Drawbacks of the GLR p. 58
13.1 Application level analysis of signalling p. 58
13.2 Reliability Issues p. 59
13.3 Upgrading of GLR capabilities p. 59
13.4 Handling of unsupported services p. 59
13.5 VLR Location Based Services p. 59
14 Open Issues p. 59
$ Change history p. 60
