L2 - GSMA Network and Access 1. Importance of GSM 2. The...

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SYSC 5403 - 2 Copyright © 1995-2009 by R.H.M. Hafez 1 GSMA Network and Access GSMA Network and Access 1. Importance of GSM 2. The GSM Mobility Model 3. GSM Air Interface 4. GPRS SYSC 5403 - 2 Copyright © 1995-2009 by R.H.M. Hafez 2 The Importance of GSM The Importance of GSM ± GSM is an international standard for personal communications ± World wide network that tracks users and keep them connected ± GSM started as a voice system but had evolved into multimedia ± GSM was the initial step in the road to broadband wireless Internet access
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SYSC 5403 - 2 Copyright © 1995-2009 by R.H.M. Hafez 3 Elements of the GSM Network VLR EIR HLR VLR MSC BSC MSC BS BS BS PSTN G E B F D C A Um Ai MS AC H ISDN Di Abis MS= Mobile Station BS = Base Station BSC = Base Station Controller MSC= Mobile Switching Center HLR= Home Location Registry VLR= Visitor Location Registry AC = Authentication Center EIR= Equipment Identity Registry PSTN= Public Switched Telephone Network ISDN= Integrated Services Digital Network SYSC 5403 - 2 Copyright © 1995-2009 by R.H.M. Hafez 4 Initial Vision of GSM Initial Vision of GSM Operator A PSTN Data Network HLR MSC MSC VLR BSC HLR VLR Operator B BSC MSC MSC IWF
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SYSC 5403 - 2 Copyright © 1995-2009 by R.H.M. Hafez 5 Including Internet Access to the GSM Vision Including Internet Access to the GSM Vision PLMN PSTN HLR MSC MSC VLR BSC HLR VLR PLMN BSC MSC MSC Backbone Packet Network Internet GW GW A A A A A A A A SYSC 5403 - 2 Copyright © 1995-2009 by R.H.M. Hafez 6 The GSM Address Hierarchy Cell Location Area (locating & paging area) MSC Service Area (area controlled by one MSC) PLMN ( one or more per country) GSM Service Area ( all member countries) Location Area Identity (LAI) MCC MNC LAC 3 digits 3 digits 2 Octet (max) Mobile Country Code Mobile Network Code Location Area Code
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SYSC 5403 - 2 Copyright © 1995-2009 by R.H.M. Hafez 7 The Mobile Switch Center The Mobile Switch Center OMC BSC MSC BSC BSC VLR IWF HLR AuC To PSTN To Public Data To Other MSC’s SYSC 5403 - 2 Copyright © 1995-2009 by R.H.M. Hafez 8 Visitor Location Registry (VLR) Visitor Location Registry (VLR) MSC VLR ¾ The VLR is a temporary database ¾ Each MSC has its own VLR ¾ It holds the records of all mobiles the are currently residing within its MSC domain. ¾ The records stay in the VLR until the mobile roams out of the MSC domain The MSC Domain
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SYSC 5403 - 2 Copyright © 1995-2009 by R.H.M. Hafez 9 Home Location Registry (HLR) Home Location Registry (HLR) MSC VLR ¾ The HLR is a bigger database. ¾ The records of each mobile is permanently registered in one HLR ¾ The HLR always knows where all its mobiles are MSC VLR MSC VLR HLR SYSC 5403 - 2 Copyright © 1995-2009 by R.H.M. Hafez 10 The GSM Mobility Model The GSM Mobility Model MSC VLR MSC VLR MSC VLR HLR PSTN
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SYSC 5403 - 2 Copyright © 1995-2009 by R.H.M. Hafez 11 GSM Typical Voice Connection GSM Typical Voice Connection PSTN GW MSC TRAU
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This note was uploaded on 01/25/2011 for the course SCE 5403 taught by Professor Hafez during the Spring '10 term at Carleton CA.

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L2 - GSMA Network and Access 1. Importance of GSM 2. The...

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