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  • Publicado : 15 de mayo de 2011
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4G Americas – Coexistence of GSM‐HSPA‐LTE‐ May 2011                                                                                                    1 

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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