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ETO/S/G/Z Line Bakkeby 28/1056-AXB 250 04 Uae Approved Checked Date Rev Reference

ETO/S/G/Z Jøran Bøch ETOEOL 2001-10-24 B

Analysis of IMSI

1 General ......................................................................................................................................... 2 1.1 Purpose ................................................................................................................................. 2 1.2 Description ............................................................................................................................ 2 1.3 Scope .................................................................................................................................... 2 1.4 Revision History..................................................................................................................... 2 1.5 References ............................................................................................................................ 3 1.6 Glossary ................................................................................................................................ 3

2 Flow Description ............................................................................................................................ 4 2.1 Flow Chart ............................................................................................................................. 4 2.2 Pre-conditions........................................................................................................................ 4 2.3 Main Flow .............................................................................................................................. 4 2.4 Alternative Flow(s) ................................................................................................................. 5 2.5 Exceptional Flow(s) ............................................................................................................... 5 2.6 Post-conditions ...................................................................................................................... 5

3 Parameters and Constraints .......................................................................................................... 5

REQUIREMENT SPECIFICATION

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ETO/S/G/Z Line Bakkeby 28/1056-AXB 250 04 Uae Approved Checked Date Rev Reference

ETO/S/G/Z Jøran Bøch ETOEOL 2001-10-24 B

1 GENERAL

1.1 PURPOSE

This use case covers the analysis of the International Mobile Subscriber Identity (IMSI) of an MS in order to obtain preliminary addressing information for the HLR and other parameters needed for traffic control purposes.

1.2 DESCRIPTION

The SGSN determines the IMSI number series to which the IMSI belongs when a base use case request IMSI analysis. The parameters associated with the IMSI number series are used to obtain a preliminary HLR address and for subsequent traffic control activities.

1.3 SCOPE

This abstract use case describes the analysis of the IMSI.

This use case starts when a base use case requests an IMSI analysis and ends when the analysis is performed.

Handle MS Mobility

(from Handle MS Mobility)

Connect to GSM network

(from Connect to GSM Network)

Analysis of IMSI

<<include>>

<<include>>

Figure 1: Use case relations

1.4 REVISION HISTORY

Rev. Date Prepared Description

A 2001-10-10 L. Bakkeby First version

B 2001-10-24 L. Bakkeby References to Glossary changed

UC diagram changed

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1.5 REFERENCES

[1] ETSI TS 03.03

[2] ITU-T Recommendation E.214

[3] ITU-T Recommendation E.212

[4] “Glossary for GSN” 0033-AXB 250 03 Uae

1.6 GLOSSARY

This chapter describes concepts that are specific for this document. Please see reference [4] for GPRS related acronyms and concepts.

Home PLMN APN operator identifier

DNS name uniquely identifying the GPRS PLMN.

IMSI The IMSI consists of the Mobile Country Code (MCC), the Mobile Network Code (MNC) and the mobile subscriber identification number (MSIN)1.

IMSI number series An IMSI number series is a sequence of leading digits common to the IMSIs of a group of subscribers. The IMSI number series comprises of at least the MCC and the MNC. All subscribers with IMSIs within the same IMSI number series therefore belong to the same PLMN.

Mobile Global Title A configurable number of leading digits of the original IMSI is replaced by another sequence of digits. Normally, a country code and a network code substitute the MCC and the MNC2.

Numbering plan Determines if the preliminary HLR address follows the E.212 or E.214 numbering plan

Roaming status Indicates whether the subscribers are home subscribers or visitors from another mobile network

1 Ref. [1] 2 Ref. [2]

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2 FLOW DESCRIPTION

2.1 FLOW CHART

Start

M1 IMSI number series

M2 Roaming status

M3 HLR addresss = MGT

A2 HLR address = IMSI

M4 Home PLMN APN operator identif ier

End

A1 Unknown IMSI number series

Figure 2: Flow Chart

2.2 PRE-CONDITIONS

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2.3 MAIN FLOW

The use case is initiated when a base use case request IMSI analysis.

Step M1: IMSI number series

1. SGSN verifies that the IMSI belongs to an existing IMSI number series.

Step M2: Roaming status

2. SGSN determines the roaming status of the MS.

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Step M3: HLR address = MGT

1. SGSN verifies that the matching IMSI number series is associated with a numbering plan indicator E.214

2. SGSN addresses the HLR with the Mobile Global Title.

Step M4: Home PLMN APN operator identifier

1. SGSN determines the home PLMN APN operator identifier.

The use case terminates

2.4 ALTERNATIVE FLOW(S)

2.4.1 Step A1: Unknown IMSI number series

This flow starts after M1 in the main flow:

1. SGSN verifies that the MS IMSI number does not belong to an existing IMSI number series.

The use case terminates.

2.4.2 Step A2: HLR address = IMSI

This flow starts after M2 in the main flow:

1. SGSN verifies that the matching IMSI number series is associated with a numbering plan indicator E.212

2. SGSN sets the unmodified IMSI as preliminary HLR address.

The use case terminates

2.5 EXCEPTIONAL FLOW(S)

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2.6 POST-CONDITIONS

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3 PARAMETERS AND CONSTRAINTS

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