2008 Whitepaper Migrations to Ngn-ims

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    C O N N E C T I N G B U S I N E S S & T E C H N O L O G Y

    Devoteam

    Devoteam Knowledge CommunitiesOctober 2008

    Mi rations to NGN/IMS

    Devoteam white paper

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    Devoteam

    C O N N E C T I N G B U S I N E S S & T E C H N O L O G Y

    MIGRATION TO NGN/IMSDEVOTEAM WHITE PAPER

    OCTOBER 2008

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    Devoteam

    C O N N E C T I N G B U S I N E S S & T E C H N O L O G Y

    Table of contents

    Table of contents...............................................................................................................................................................3List of figures.....................................................................................................................................................................51. Introduction ..........................................................................................................................................................61.1. Purpose of the document....................................................................................................................................61.2. How to read this White Paper .............................................................................................................................61.3. About Devoteam...................................................................................................................................................71.4. About the authors ................................................................................................................................................72. Driving forces in the Telecoms industry in Europe........................................................................................102.1. Markets insights and trends .............................................................................................................................112.1.1. A gradually eroding European fixed revenue .......................................................................................................112.1.2. Near saturation on mobile markets has spurred competition ..............................................................................122.2. Future of technology and usages in the Telecoms industry.........................................................................13 2.2.1. Changing end-user expectations, behaviours and usage patterns......................................................................132.2.2. Advanced technological tools, telecom and media convergence........................................................................132.2.3. Transformation of Telco players positioning and business models......................................................................142.2.4. Globalisation transitions.......................................................................................................................................143. Regulatory intervention in NGN .......................................................................................................................153.1. A market view on regulatory approach............................................................................................................153.2. Acting on control points....................................................................................................................................153.3. Possible regulatory implications of the technical differences between circuit switching and IP.............173.4. Evolutions of charging models ........................................................................................................................203.4.1. Charging principles ..............................................................................................................................................203.4.2. Charging options for IP-interconnection ..............................................................................................................21

    4. Regulatory evolutions in Europe .....................................................................................................................224.1. A short history of EU regulation in telecommunications ..............................................................................224.2. Current regulatory framework ..........................................................................................................................234.3. Current rules.......................................................................................................................................................244.4. Regulatory evolutions proposed by the EU ....................................................................................................255. Trends in architectures and migration strategies ..........................................................................................295.1. Reminder of PLMN migration milestones .......................................................................................................295.2. Trends in architectures .....................................................................................................................................325.3. Trends in session control protocols................................................................................................................346. Core network migrations...................................................................................................................................376.1. Overall strategies...............................................................................................................................................376.2. MSC-Server evolutions towards NGN interconnections................................................................................417. Service migration...............................................................................................................................................44

    7.1. Legacy services continuity with IM-SSF .........................................................................................................447.1.1. Migration of PSTN/ISDN/Mobile Supplementary Services ..................................................................................457.1.2. Migration of IN services using OSA/Parlay..........................................................................................................487.1.3. Interactions between Legacy Services and OSA/SIP applications......................................................................497.1.4. IM-SCF: Smooth migration towards SIP applications..........................................................................................527.2. Mobility and voice call continuity.....................................................................................................................527.3. IMS service example: the emergency call service..........................................................................................557.4. Service enablers: the presence server use case............................................................................................577.4.1. Background and concepts ...................................................................................................................................577.4.2. PIDF/RPID protocols............................................................................................................................................597.4.3. XCAP protocol......................................................................................................................................................607.4.4. Example of service improvement with presence: call filtering .............................................................................617.4.5. Migration for legacy user to the IMS service........................................................................................................62

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    7.4.6. References...........................................................................................................................................................63

    8. Fixed-Mobile Convergence and access migrations .......................................................................................648.1. Overview of Fixed-Mobile Convergence technologies ..................................................................................648.2. A FMC experience: BT Fusion ..........................................................................................................................678.3. Access migration procedures ..........................................................................................................................678.3.1. Architecture & Design ..........................................................................................................................................698.3.2. Migration Preparation...........................................................................................................................................708.3.3. Lab Verification of Migration Strategy ..................................................................................................................718.3.4. Pilot site migration........................................................................................................