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P05.Single Radio Voice Call Continuity (SRVCC) and CSFB Vs SRVCC.pdf

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The document discusses Single Radio Voice Call Continuity (SRVCC), which facilitates voice call transitions between 2G, 3G, and LTE networks, ensuring service continuity during handovers. It details various versions and improvements of SRVCC, including Enhanced SRVCC (eSRVCC) which reduces call interruption time significantly. Additionally, the document provides technical specifications and call flow diagrams related to SRVCC and its related technologies.

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P05.Single Radio Voice Call Continuity (SRVCC) and CSFB Vs SRVCC.pdf
What is SRVCC (Single Radio Voice Call Continuity) LTE Network 2G/3G Network Service Continuity 3GPP TS 23.216 http://TelecomTutorial.info Moving UE
CSFB : Circuit Switched Fall Back VoLTE : Voice over LTE SRVCC : Single Radio Voice Call Continuity eSRVCC : Enhanced SRVCC aSRVCC : Alerting SRVCC Evolution of Voice Call 2G Radio 3G Radio 4G Network - CSFB call on 3G 4G Network – VoLTE Call on 4G 4G Network – VoLTE + SRVCC 4G Network – VoLTE + SRVCC + eSRVCC + aSRVCC 1992 2012 2012 2008 2000 2012 http://TelecomTutorial.info
` 4G IMS 2G/3G Network 4G Trying to Call Voice Call start in underlying 2G , 3G Radio CSFB VoLTE + SRVCC PUSH 4G Coverage Holes 2G/3G TEMPORARY SOLUTION Various Approach to Voice Calls TARGET SOLUTION Call Quality Setup Time Less Resources Non-VoLTE N/W VoLTE N/W CSFB : Circuit Switched Fall Back http://TelecomTutorial.info Service Based Handover Coverage Based Handover
Evolution of SRVCC Name 3GPP Release Description Basic SRVCC Rel 8 Call Continuity from E-UTRAN to UTRAN/GRAN aSRVCC Rel 10 Packet switched to Circuit Switched call transfer during Alerting Phase eSRVCC Rel 10 Enhanced SRVCC (Support for MSC Server assisted Mid Call Feature) vSRVCC Rel 11 Video SRVCC rSRVCC Rel 11 SRVCC from UTRAN/GRAN to E-UTRAN 3GPP TS 23.216 GSMA IR.64 Improve User experience http://TelecomTutorial.info
How it works Sv Interface LTE Network 2G/3G Network Service Continuity IMS . MME SGW , PGW Take Handover of this Call OK Sir 3GPP TS 29.280 B Party MSC http://TelecomTutorial.info
SRVCC Call flow Handover Preparation Flow Page 39 http://TelecomTutorial.info
SRVCC Call flow MME MSC 4G EnodeB 2G/3G Network IMS SGSN SGW / PGW 2G/3G Network 1 Measurement reports B Party http://TelecomTutorial.info
SRVCC Call flow MME MSC 4G EnodeB 2G/3G Network IMS SGSN SGW / PGW 2G/3G Network 2 Handover Required Measurement reports 1 B Party http://TelecomTutorial.info
SRVCC Call flow MME MSC 4G EnodeB 2G/3G Network IMS SGSN SGW / PGW 2G/3G Network Measurement reports 1 3 PS to CS Req Handover Required 2 3 Forward Relocation Req Bearer Split B Party http://TelecomTutorial.info 4 Relocation HO Req 4 Relocation HO Req
MME MSC 4G EnodeB 2G/3G Network IMS SGSN SGW / PGW 2G/3G Network Measurement reports Handover Required PS to CS Req Relocation HO Req Forward Relocation Req Relocation HO Req Ack Ack SRVCC Call flow B Party Ack http://TelecomTutorial.info
MME 4G EnodeB 2G/3G Network IMS SGW / PGW 2G/3G Network Measurement reports Handover Required PS to CS Request Relocation HO Req Forward Relocation Req Relocation HO Req Session Transfer (STN-SR or E-STN-SR) MSC SGSN Ack Ack Ack SRVCC Call flow B Party http://TelecomTutorial.info
MME 4G EnodeB 2G/3G Network IMS SGW / PGW 2G/3G Network Measurement reports Handover Required PS to CS Request Relocation HO Req Forward Relocation Req Relocation HO Req Session Transfer (STN-SR or E-STN-SR) MSC SGSN Ack Ack Ack Handover Command PS to CS Response Go to 3G SRVCC Call flow Session transfer and Update remote end Release of IMS access leg 3GPP TS 23.237 B Party http://TelecomTutorial.info
2G/3G Network IMS 2G/3G Network MSC SGSN MME 4G EnodeB SRVCC Call flow UE tunes to UTRAN/GERAN B Party http://TelecomTutorial.info
SRVCC Call flow Handover Execution Flow Page 39 http://TelecomTutorial.info
2G/3G Network IMS 2G/3G Network MSC SGSN MME 4G EnodeB SRVCC Call flow Relocation Handover Complete B Party PS to CS Complete/Ack http://TelecomTutorial.info
2G/3G Network IMS 2G/3G Network MSC SGSN MME 4G EnodeB SRVCC Call flow Reloc/HO Complete PS to CS Complete/Ack TMSI Reallocation HLR Update Loc B Party Forward Reloc Complete Update Bearer PGW Reloc/HO Complete http://TelecomTutorial.info
SRVCC Identities STN-SR • Used for Session Transfer of Call to CS Domain • E.164 Nomenclature ( Similar to MSRN ) • Flow • HSS -> MME (s6, Attach Flow) • MME -> MSC (Sv, PS->CS Req) • MSC -> IMS ( Voice Call ) C-MSISDN • Used for correlation of sessions at access transfer • MSISDN of User in CS Network • Helps to Identify Session to be Transferred Session transfer number for SRVCC (STN-SR) Correlation MSISDN (C-MSISDN) http://TelecomTutorial.info
Network Changes required for Enabling SRVCC ATCF ATGW MSS E-UTRAN MME HSS SR-VCC- IWF SCC-AS New http://TelecomTutorial.info
Enhanced SRVCC ( eSRVCC ) Benefits of eSRVCC • Interruption Time Reduced • SRVCC : 800-1000 ms • eSRVCC : < 300 ms Changes Done for eSRVCC • Anchoring Point Change • SRVCC : Home SCC-AS ( Call Must Go Back to Home Network for Roamers ) • eSRVCC : Serving Network ATCF/ATGW ( Call can be Switched in Visited Network Itself – This Saves Time ) http://TelecomTutorial.info
Further Study .. Specs Ref Name of Document GSMA, IR.92 IMS Profile for Voice and SMS GSMA, IR.94 IMS Profile for Conversational Video Service 3GPP, TS.23.216 Single Radio Voice Call Continuity (SRVCC) GSMA, IR.64 IMS Service Centralization and Continuity Guidelines V6.0 3GPP, TS22.278 Service Requirements for the Evolved Packet System (EPS) 3GPP, TS23.237 IP Multimedia Subsystem (IMS) Service Continuity Stage 2 http://TelecomTutorial.info
VISIT MY WEBSITE https://telecomtutorial.info Vikas Shokeen Free Download – Video Free Download – Presentation FOR

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P05.Single Radio Voice Call Continuity (SRVCC) and CSFB Vs SRVCC.pdf

  • 2. What is SRVCC (Single Radio Voice Call Continuity) LTE Network 2G/3G Network Service Continuity 3GPP TS 23.216 http://TelecomTutorial.info Moving UE
  • 3. CSFB : Circuit Switched Fall Back VoLTE : Voice over LTE SRVCC : Single Radio Voice Call Continuity eSRVCC : Enhanced SRVCC aSRVCC : Alerting SRVCC Evolution of Voice Call 2G Radio 3G Radio 4G Network - CSFB call on 3G 4G Network – VoLTE Call on 4G 4G Network – VoLTE + SRVCC 4G Network – VoLTE + SRVCC + eSRVCC + aSRVCC 1992 2012 2012 2008 2000 2012 http://TelecomTutorial.info
  • 4. ` 4G IMS 2G/3G Network 4G Trying to Call Voice Call start in underlying 2G , 3G Radio CSFB VoLTE + SRVCC PUSH 4G Coverage Holes 2G/3G TEMPORARY SOLUTION Various Approach to Voice Calls TARGET SOLUTION Call Quality Setup Time Less Resources Non-VoLTE N/W VoLTE N/W CSFB : Circuit Switched Fall Back http://TelecomTutorial.info Service Based Handover Coverage Based Handover
  • 5. Evolution of SRVCC Name 3GPP Release Description Basic SRVCC Rel 8 Call Continuity from E-UTRAN to UTRAN/GRAN aSRVCC Rel 10 Packet switched to Circuit Switched call transfer during Alerting Phase eSRVCC Rel 10 Enhanced SRVCC (Support for MSC Server assisted Mid Call Feature) vSRVCC Rel 11 Video SRVCC rSRVCC Rel 11 SRVCC from UTRAN/GRAN to E-UTRAN 3GPP TS 23.216 GSMA IR.64 Improve User experience http://TelecomTutorial.info
  • 6. How it works Sv Interface LTE Network 2G/3G Network Service Continuity IMS . MME SGW , PGW Take Handover of this Call OK Sir 3GPP TS 29.280 B Party MSC http://TelecomTutorial.info
  • 7. SRVCC Call flow Handover Preparation Flow Page 39 http://TelecomTutorial.info
  • 8. SRVCC Call flow MME MSC 4G EnodeB 2G/3G Network IMS SGSN SGW / PGW 2G/3G Network 1 Measurement reports B Party http://TelecomTutorial.info
  • 9. SRVCC Call flow MME MSC 4G EnodeB 2G/3G Network IMS SGSN SGW / PGW 2G/3G Network 2 Handover Required Measurement reports 1 B Party http://TelecomTutorial.info
  • 10. SRVCC Call flow MME MSC 4G EnodeB 2G/3G Network IMS SGSN SGW / PGW 2G/3G Network Measurement reports 1 3 PS to CS Req Handover Required 2 3 Forward Relocation Req Bearer Split B Party http://TelecomTutorial.info 4 Relocation HO Req 4 Relocation HO Req
  • 11. MME MSC 4G EnodeB 2G/3G Network IMS SGSN SGW / PGW 2G/3G Network Measurement reports Handover Required PS to CS Req Relocation HO Req Forward Relocation Req Relocation HO Req Ack Ack SRVCC Call flow B Party Ack http://TelecomTutorial.info
  • 12. MME 4G EnodeB 2G/3G Network IMS SGW / PGW 2G/3G Network Measurement reports Handover Required PS to CS Request Relocation HO Req Forward Relocation Req Relocation HO Req Session Transfer (STN-SR or E-STN-SR) MSC SGSN Ack Ack Ack SRVCC Call flow B Party http://TelecomTutorial.info
  • 13. MME 4G EnodeB 2G/3G Network IMS SGW / PGW 2G/3G Network Measurement reports Handover Required PS to CS Request Relocation HO Req Forward Relocation Req Relocation HO Req Session Transfer (STN-SR or E-STN-SR) MSC SGSN Ack Ack Ack Handover Command PS to CS Response Go to 3G SRVCC Call flow Session transfer and Update remote end Release of IMS access leg 3GPP TS 23.237 B Party http://TelecomTutorial.info
  • 14. 2G/3G Network IMS 2G/3G Network MSC SGSN MME 4G EnodeB SRVCC Call flow UE tunes to UTRAN/GERAN B Party http://TelecomTutorial.info
  • 15. SRVCC Call flow Handover Execution Flow Page 39 http://TelecomTutorial.info
  • 16. 2G/3G Network IMS 2G/3G Network MSC SGSN MME 4G EnodeB SRVCC Call flow Relocation Handover Complete B Party PS to CS Complete/Ack http://TelecomTutorial.info
  • 17. 2G/3G Network IMS 2G/3G Network MSC SGSN MME 4G EnodeB SRVCC Call flow Reloc/HO Complete PS to CS Complete/Ack TMSI Reallocation HLR Update Loc B Party Forward Reloc Complete Update Bearer PGW Reloc/HO Complete http://TelecomTutorial.info
  • 18. SRVCC Identities STN-SR • Used for Session Transfer of Call to CS Domain • E.164 Nomenclature ( Similar to MSRN ) • Flow • HSS -> MME (s6, Attach Flow) • MME -> MSC (Sv, PS->CS Req) • MSC -> IMS ( Voice Call ) C-MSISDN • Used for correlation of sessions at access transfer • MSISDN of User in CS Network • Helps to Identify Session to be Transferred Session transfer number for SRVCC (STN-SR) Correlation MSISDN (C-MSISDN) http://TelecomTutorial.info
  • 19. Network Changes required for Enabling SRVCC ATCF ATGW MSS E-UTRAN MME HSS SR-VCC- IWF SCC-AS New http://TelecomTutorial.info
  • 20. Enhanced SRVCC ( eSRVCC ) Benefits of eSRVCC • Interruption Time Reduced • SRVCC : 800-1000 ms • eSRVCC : < 300 ms Changes Done for eSRVCC • Anchoring Point Change • SRVCC : Home SCC-AS ( Call Must Go Back to Home Network for Roamers ) • eSRVCC : Serving Network ATCF/ATGW ( Call can be Switched in Visited Network Itself – This Saves Time ) http://TelecomTutorial.info
  • 21. Further Study .. Specs Ref Name of Document GSMA, IR.92 IMS Profile for Voice and SMS GSMA, IR.94 IMS Profile for Conversational Video Service 3GPP, TS.23.216 Single Radio Voice Call Continuity (SRVCC) GSMA, IR.64 IMS Service Centralization and Continuity Guidelines V6.0 3GPP, TS22.278 Service Requirements for the Evolved Packet System (EPS) 3GPP, TS23.237 IP Multimedia Subsystem (IMS) Service Continuity Stage 2 http://TelecomTutorial.info
  • 22. VISIT MY WEBSITE https://telecomtutorial.info Vikas Shokeen Free Download – Video Free Download – Presentation FOR