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TechSpec
  • Foreword
  • 1 Scope
  • 2 References
  • 3 Definitions and abbreviations
  • 4 High level Principles and Concepts
  • 5 Architecture model and reference points
  • 6 Procedures and flows
    • 6.1 SRVCC from E-UTRAN to 3GPP2 1xCS
    • 6.2 E-UTRAN and 3GPP GERAN/UTRAN (v)SRVCC
      • 6.2.1 E-UTRAN Attach procedure for (v)SRVCC
      • 6.2.1A Service Request procedures for (v)SRVCC
      • 6.2.1B PS Handover procedures for (v)SRVCC
      • 6.2.1C Dedicated Bearer Establishment and Modification procedures for vSRVCC
      • 6.2.2 Call flows for (v)SRVCC from E-UTRAN
      • 6.2.3 Returning back to E-UTRAN
    • 6.3 UTRAN (HSPA) and 3GPP GERAN/UTRAN SRVCC
      • 6.3.1 GPRS Attach procedure for SRVCC
      • 6.3.1A Service Request procedures for SRVCC
      • 6.3.1B PS Handover procedures for SRVCC
      • 6.3.2 Call flows for SRVCC from UTRAN (HSPA)
    • 6.4 CS to PS SRVCC
    • 6.5 5G-SRVCC from NG-RAN to 3GPP UTRAN
  • 7 Charging
  • 8 Handover Failure
  • 9 Security
  • A.1 SRVCC from E-UTRAN to 3GPP2 1xCS
  • A.2 SRVCC from E-UTRAN to GERAN / UTRAN
  • A.3 SRVCC from UTRAN (HSPA) to GERAN / UTRAN
  • A.4 SRVCC from GERAN / UTRAN to E-UTRAN / UTRAN (HSPA)

6.3.1A Service Request procedures for SRVCC

23.2163GPPRelease 16Single Radio Voice Call Continuity (SRVCC)Stage 2TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

Service Request procedures for 3GPP SRVCC UE are performed as defined in TS 23.060 [10] with the following additions:

– SGSN includes a "SRVCC operation possible" indication in the RANAP Common ID message, meaning that both UE and SGSN are SRVCC-capable.