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CONTENTS
EXECUTIVE SUMMARY .............................................................................................................................. 4 1 Introduction..................................................................................................................................... 5 1.1 1.2 1.3 Coexistence of GSM, HSPA/WCDMA AND LTE ........................................................... 5 The System Architecture Evolution Aspects .................................................................. 5 Scope............................................................................................................................. 6 Voice Solutions .............................................................................................................. 6 Mobility ........................................................................................................................... 6 Roaming Aspects........................................................................................................... 6 Radio Network Design and Performance....................................................................... 7 Technology Coexistence ................................................................................................ 8 Spectrum Considerations ............................................................................................... 8 Multi-StandardRadio ..................................................................................................... 8 The UICC/USIM and Roaming ..................................................................................... 10 Coverage Triggered WCDMA/GERAN Session Continuity ......................................... 10 Core Network Overview............................................................................................... 11 Migratory ASpects ........................................................................................................ 12 Pre-Rel-8 Gn/Gp Mobility ............................................................................................. 13 Rel-8 S3/S4 Based EPS Mobility................................................................................. 14 Subscriber Data Aspects: USIM/ISIM .......................................................................... 15 Roaming Scenarios ...................................................................................................... 15 Home tunneling or home routed scenario .................................................................... 16 Home tunneling along with possibilityof local breakout .............................................. 16 QoS classification and differences in 3GPP networks ................................................. 18 QoS Classification in LTE Rel-8 ................................................................................... 18 QoS classification in UMTS and GPRS networks ........................................................ 20 Network-initiated vs. Terminal-initiated QoS control paradigms .................................. 20 Services over LTE ........................................................................................................ 22 Circuit Switched Fallback ............................................................................................. 24 RRC Release with Redirect......................................................................................... 25 Enhanced Release with Redirect, Automatic System info Exchange with RIM........... 26 PS Handover between LTE and GERAN for CSFB ..................................................... 27 Cell Change Order ....................................................................................................... 28 IMS Voice...
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