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4G Americas – Coexistence of GSMHSPALTEMay 2011 1

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  • 4GAmericasCoexistenceofGSMHSPALTEMay20111

  • 4GAmericasCoexistenceofGSMHSPALTEMay20112

    CONTENTS

    EXECUTIVE SUMMARY .............................................................................................................................. 4

    1 Introduction..................................................................................................................................... 5

    1.1 Coexistence of GSM, HSPA/WCDMA AND LTE ........................................................... 51.2 The System Architecture Evolution Aspects .................................................................. 51.3 Scope ............................................................................................................................. 6

    Voice Solutions .............................................................................................................. 6Mobility ........................................................................................................................... 6Roaming Aspects ........................................................................................................... 6Radio Network Design and Performance ....................................................................... 7

    2 Radio Access Network Considerations ....................................................................................... 8

    2.1 Technology Coexistence ................................................................................................ 82.2 Spectrum Considerations ............................................................................................... 8

    Multi-Standard Radio ..................................................................................................... 82.3 The UICC/USIM and Roaming ..................................................................................... 102.4 Coverage Triggered WCDMA/GERAN Session Continuity ......................................... 10

    3 Core Network Considerations ..................................................................................................... 11

    3.1 Core Network Overview ............................................................................................... 113.2 Migratory ASpects ........................................................................................................ 12

    Pre-Rel-8 Gn/Gp Mobility ............................................................................................. 13Rel-8 S3/S4 Based EPS Mobility ................................................................................. 14

    3.3 Subscriber Data Aspects: USIM/ISIM .......................................................................... 153.4 Roaming Scenarios ...................................................................................................... 15

    Home tunneling or home routed scenario .................................................................... 16Home tunneling along with possibility of local breakout .............................................. 16

    4 QoS in 3GPP ................................................................................................................................. 16

    4.1 QoS classification and differences in 3GPP networks ................................................. 18QoS Classification in LTE Rel-8 ................................................................................... 18QoS classification in UMTS and GPRS networks ........................................................ 20

    4.2 Network-initiated vs. Terminal-initiated QoS control paradigms .................................. 20

    5 LTE Services ................................................................................................................................. 22

    5.1 Services over LTE ........................................................................................................ 225.2 Circuit Switched Fallback ............................................................................................. 24

    RRC Release with Redirect ......................................................................................... 25Enhanced Release with Redirect, Automatic System info Exchange with RIM ........... 26PS Handover between LTE and GERAN for CSFB ..................................................... 27Cell Change Order ....................................................................................................... 28

    5.3 IMS Voice ..................................................................................................................... 28Introduction to IMS ....................................................................................................... 28Introduction to MMTEL ................................................................................................. 30

    5.4 LTE To Circuit Switched Voice Call Continuity ............................................................ 323GPP Rel-9 Architecture enhancements ..................................................................... 323GPP Rel-10 Architecture enhancements ................................................................... 33

    5.5 Roaming Considerations .............................................................................................. 345.6 IMS Centralized SERVICES (ICS) ............................................................................... 34

    Architecture for ICS ...................................................................................................... 355.7 Messaging over LTE .................................................................................................... 35

    SMS over SGS ............................................................................................................. 35IMS Messaging ............................................................................................................ 36UICC/USIM and IMS Messaging.................................................................................. 38

  • 4GAmericasCoexistenceofGSMHSPALTEMay20113

    6 Regulatory Issues ........................................................................................................................ 39

    6.1 Lawful Intercept ............................................................................................................ 396.2 Emergency Services .................................................................................................... 406.3 Telecommunications Device for the Deaf (TDD) ......................................................... 416.4 Non-Voice Emergency Service (NOVES) .................................................................... 416.5 Priority Services ........................................................................................................... 426.6 Commercial Mobile Alert System (CMAS) ................................................................... 43

    7 Devices for Seamless Migration ................................................................................................. 467.1 Multimode and Multiband Devices ............................................................................... 46

    Antenna Separation and frequency band of operation ................................................ 507.2 Support for LTE UE Profile Defined by IR.92 for Voice ............................................... 52

    8 Evolution to communication with devices ................................................................................ 54

    8.1 Network Security .......................................................................................................... 568.2 Network Considerations ............................................................................................... 568.3 Device Implications (Man-Machine Interface of UE) .................................................... 568.4 MTC Implications for Coexistence of GSM, HSPA, LTE ............................................. 58

    Conclusion ................................................................................................................................................. 59

    Glossary ..................................................................................................................................................... 60

    Appendix .................................................................................................................................................... 62

    Acknowledgements .................................................................................................................................. 63

  • 4GAmericasCoexistenceofGSMHSPALTEMay20114

    EXECUTIVESUMMARY

    This whitepaper covers the coexistence of GSM, HSPA and LTE and migratory aspects from Rel-7 to Rel-8 and beyond based on the 3GPP specification. The topics covered include:

    The Radio Access Network Aspects of the Coexistence

    The Core Network Considerations

    The Quality of Service (QoS) Requirements

    The Future Of Voice/Messaging Services on LTE including CSFB, SRVCC and VoLTE and IMS Services

    Regulatory Aspects

    Multimode and Multiband Devices and Machine Type Communications for Coexisting Networks

    The chapter on Radio Access Networks discusses the spectrum considerations and the concept of Multi-Standard Radios (MSR) that will be key to coexistence in the future. Impact on antennas is briefly touched upon as well. Then the chapter discusses UICC/USIM roaming. It closes with coverage triggered session continuity from LTE to WCDMA/GERAN Networks.

    The chapter on core network considerations provides a core network overview i.e. the Evolved Packet Core (EPC