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SRVCC (Single Radio Voice Call Continuity) in VoLTE & Comparison with CSFB
The document discusses Single Radio Voice Call Continuity (SRVCC) in LTE and legacy 2G/3G networks, highlighting the evolution of voice call technology from circuit-switched to packet-switched systems. It outlines the functionalities of basic SRVCC, Enhanced SRVCC (ESRVCC), and other related technologies, emphasizing improvements in call continuity and user experience. Additionally, it provides insights into network requirements and the overall call flow processes for effective service continuity.
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Introduces SRVCC (Single Radio Voice Call Continuity) enabling service continuity between LTE and 2G/3G networks.
Discusses various voice technologies: CSFB, VoLTE, SRVCC, eSRVCC, and aSRVCC, and their evolution from 2G to 4G.
Outlines voice call strategies, including CSFB and SRVCC, addressing call quality and service setup in varying network conditions.
Details the evolution of SRVCC with various releases (Basic SRVCC, eSRVCC, aSRVCC, vSRVCC) enhancing call continuity.
Illustrates SRVCC operation through service continuity across LTE and 2G/3G networks, focusing on call handling flow.
Describes the handover preparation process in SRVCC to ensure seamless voice call transfer.
Explains the measurement reports' role and the handover requirements within SRVCC for effective call transition.
Shows necessary measurements and requisites for SRVCC handovers, emphasizing their importance for call continuity.
Presents the detailed steps involved in SRVCC call flow, including requests and acknowledgements during handover.
Describes the final processes in SRVCC call flow including session transfer and network adjustments post-handover.
Illustrates execution aspects for the SRVCC handover process to ensure continuity during voice calls.
Covers the completion of SRVCC handover with acknowledgment of successful transfer and updates to the network.
Explains SRVCC identifiers like STN-SR and C-MSISDN critical for call session transfer and identification.
Lists the necessary network changes to enable SRVCC, focusing on components like ATCF and ATGW.
Highlights advantages of eSRVCC, emphasizing reduced interruption times for call continuity during transitions.
Provides references for further study related to SRVCC and related technologies in telecommunications.
Encourages visitors to access additional resources and downloads from the speaker's website.
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SRVCC (Single Radio Voice Call Continuity) in VoLTE & Comparison with CSFB
- 2. What is SRVCC (SingleRadio Voice Call Continuity) LTE Network 2G/3G Network Service Continuity 3GPP TS 23.216 http://TelecomTutorial.info Moving UE
- 3. CSFB : CircuitSwitched 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 Callstart 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 Rel8 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 23.216GSMA IR.64 ImproveUserexperience http://TelecomTutorial.info
- 6. How it works Sv Interface LTENetwork 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 HandoverPreparation Flow Page 39 http://TelecomTutorial.info
- 8. SRVCC Call flow MMEMSC 4G EnodeB 2G/3G Network IMS SGSN SGW / PGW 2G/3G Network 1 Measurement reports B Party http://TelecomTutorial.info
- 9. SRVCC Call flow MMEMSC 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 MMEMSC 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 HOReq 4 Relocation HOReq
- 11. MME MSC 4G EnodeB 2G/3G Network IMS SGSN SGW/ PGW 2G/3G Network Measurement reports Handover Required PS to CS Req Relocation HOReq Forward Relocation Req Relocation HOReq 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 HOReq Forward Relocation Req Relocation HOReq Session Transfer (STN-SR or E-STN-SR) MSCSGSN 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 HOReq Forward Relocation Req Relocation HOReq Session Transfer (STN-SR or E-STN-SR) MSCSGSN 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 MSCSGSN MME 4G EnodeB SRVCCCall flow UE tunes to UTRAN/GERAN B Party http://TelecomTutorial.info
- 15. SRVCC Call flow HandoverExecution Flow Page 39 http://TelecomTutorial.info
- 16. 2G/3G Network IMS 2G/3G Network MSCSGSN MME 4G EnodeB SRVCCCall flow Relocation HandoverComplete B Party PS to CS Complete/Ack http://TelecomTutorial.info
- 17. 2G/3G Network IMS 2G/3G Network MSCSGSN MME 4G EnodeB SRVCCCall flow Reloc/HO Complete PS to CS Complete/Ack TMSI Reallocation HLRUpdate Loc B Party Forward Reloc Complete Update Bearer PGW Reloc/HO Complete http://TelecomTutorial.info
- 18. SRVCC Identities STN-SR • Usedfor 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 requiredfor 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 .. SpecsRef 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 VikasShokeen Free Download – Video Free Download – Presentation FOR