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VoWifi 03 - vowifi epdg aaa and architecture (pdf ppt)
This document provides an overview of Voice over WiFi (VoWifi) including the key nodes involved and their roles. It discusses the user equipment (UE), evolved Packet Data Gateway (ePDG), AAA server, PGW, HSS, IMS, and PCRF nodes. The UE establishes an IPsec tunnel with the ePDG to access the EPC over an untrusted WiFi network. The ePDG and AAA server perform authentication. The existing PGW, HSS, IMS, and PCRF nodes are reused to support VoWifi calls and handovers between VoLTE and VoWifi. Key performance indicators for each node are also measured to ensure quality of VoWifi user experience
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VoWifi 03 - vowifi epdg aaa and architecture (pdf ppt)
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- 2. www.TelecomTutorial.info Contents Telecomtutorial.info •VoWifi Nodes •Role ofePDG , AAA & UE •Role of PGW , HSS , IMS , PCRF for VoWifi •KPI & Performance of VoWifi •Measure User Experience of VoWifi
- 3. www.TelecomTutorial.info Introduction PGw EPC SBC & P-CSCF TAS IMS ePDG CSCF MRF Untrusted WLAN (e.g.Home Wifi ) SGW SWu S2b SWm MME AAA SWx HSS PCRF EnodeB New Nodes • ePDG • 3GPP AAA • VoWifi capable UE Re-Use Existing Nodes • PGW • HSS • PCRF • TAS & IMS Core IPSEC Tunnel
- 4. www.TelecomTutorial.info www.TelecomTutorial.info Role of UE- Untrusted WLAN 1 SECTION Role of UE ePDG Untrusted WLAN (e.g. Home Wifi ) Internet AAA EPC IMS User Equipment 4G PACO
- 5. www.TelecomTutorial.info UE Basics &Main Functions PGw EPC SBC & P-CSCF TAS IMS ePDG CSCF MRF Untrusted WLAN (e.g. Home Wifi ) SGW SWu S2b SWm MME AAA SWx HSS PCRF EnodeB UE Capabilities • USIM / ISIM • Hardware -Software Version for VoWifi Support • Operator based Binary Profile , Authentication & Security
- 6. www.TelecomTutorial.info PGw EPC SBC & P-CSCF TAS IMS ePDG CSCF MRF Untrusted WLAN (e.g.Home Wifi ) SGW SWu S2b SWm MME AAA SWx HSS PCRF EnodeB UE Tasks (Technical) • Latching to Wifi Network • Discovering the ePDG using DNS • Establishing of IPSEC tunnel to ePDG • Get P-CSCF Details from Network • Performing SIP registration • Makes or receiving call via IMS/TAS UE Basics & Main Functions
- 7. www.TelecomTutorial.info UE Basics &Main Functions Default VoWifi Call (Y/N) ? VoLTE to VoWifi & Vice Versa Handover Allowed (Y/N)? VoLTE / VoWifi thresholds - Wifi Signal , LTE Signal , Jitter / Packet loss / Packet Delay on Wifi Network Timers : Guard Timer xx Sec to avoid Ping pong between VoWifi and VoLTE Encryption Algorithm & Key Life time APN Details, ePDG Address etc.. Carrier bundle In Handset Key Decisions taken by UE
- 8. www.TelecomTutorial.info www.TelecomTutorial.info Role of ePDG- Untrusted WLAN 2 SECTION Role of ePDG ePDG Untrusted WLAN (e.g. Home Wifi ) AAA EPC IMS 4G PACO
- 9. www.TelecomTutorial.info ePDG Overview &3GPP Specs ePDG Overview • Specs : TS 23.402 • Connect UE to EPC • Act as Gateway • Terminates IPSEC Tunnel
- 10. www.TelecomTutorial.info ePDG Basics –Main Functions PGw EPC SBC & P-CSCF TAS IMS ePDG CSCF MRF Untrusted WLAN (e.g. Home Wifi ) SGW SWu S2b SWm MME AAA SWx HSS PCRF EnodeB ePDG Tasks - PGW Side • Landing point for traffic from Internet • IPSec/IKEv2 security & encryption • Transit Path to Mobile Core PGW • Facilitates PGW Selection • QoS mapping (DSCP Marking) • Lawful Interception. Bearers IPSEC Sessions ePDG Tasks - AAA Side • Authentication & Authorization with AAA • Retrieves PGW address from AAA to facilitate VoLTE to VoWifi Handovers 3GPP TS 23.402
- 11. www.TelecomTutorial.info ePDG Basics –Considerations PGw EPC SBC & P-CSCF TAS IMS ePDG CSCF MRF Untrusted WLAN (e.g. Home Wifi ) SGW SWu S2b SWm MME AAA SWx HSS PCRF EnodeB Considerations for ePDG • Security & Privacy • Service Parity • Integration • Network Integration & Deployment 3GPP TS 23.402
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- 13. www.TelecomTutorial.info ePDG Basics –Performance & KPIs PGw EPC SBC & P-CSCF TAS IMS ePDG CSCF MRF Untrusted WLAN (e.g. Home Wifi ) SGW SWu S2b SWm MME AAA SWx HSS PCRF EnodeB ePDG KPIs & Performance • Session & Bearer Related KPIs • Authentication & Authorization KPIs • IPSEC Related KPIs • Service Continuity KPIs • Volumetric KPIs , Capacity & Utilz 3GPP TS 23.402
- 14. www.TelecomTutorial.info www.TelecomTutorial.info Role of AAA- Untrusted WLAN 3 SECTION Role of AAA ePDG Untrusted WLAN (e.g. Home Wifi ) AAA EPC IMS 4G PACO
- 15. www.TelecomTutorial.info AAA Basics –Main Functions PGw EPC SBC & P-CSCF TAS IMS ePDG CSCF MRF Untrusted WLAN (e.g. Home Wifi ) SGW SWu S2b MME AAA SWx HSS PCRF EnodeB 3GPP TS 29.273 • Authentication of User using EAP-AKA • Retrieves authentication information from HSS & Communicate Authentication information back to ePDG • Register itself in HSS for every authenticated and authorized user • Purge the User if Required as per Lifecycle or Profile changes
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- 17. www.TelecomTutorial.info AAA Basics –KPI & Performance PGw EPC SBC & P-CSCF TAS IMS ePDG CSCF MRF Untrusted WLAN (e.g. Home Wifi ) SGW SWu S2b MME AAA SWx HSS PCRF EnodeB 3GPP TS 29.273 • Authentication & Authorization performance : Success Rates on SWm , SWx & S6b interfaces such as AAR SR , EAP SR , MAR SR , RAR SR , STR SR etc.. • Volumetric KPIs : Failed Vs Authenticated Users , Concurrent Session , TPS
- 18. www.TelecomTutorial.info www.TelecomTutorial.info Role of PGW, HSS , IMS , PCRF 4 SECTION Role of PGW , HSS , IMS , PCRF PGw EPC IMS IMS ePDG Untrusted WLAN (e.g. Home Wifi ) SGW SWu S2b SWm MME AAA SWx HSS PCRF EnodeB Re-Use Existing Nodes • PGW • HSS • PCRF • TAS & IMS Core
- 19. www.TelecomTutorial.info Role of PGWfor VoWifi PGw EPC SBC & P-CSCF TAS IMS ePDG CSCF MRF Untrusted WLAN (e.g. Home Wifi ) SGW SWu S2b SWm MME AAA SWx HSS PCRF EnodeB Adaptations in PGW for VoWifi • VoWifi typically uses existing PGW deployed in Network. It is used for both Payload & Signaling traffic • Allocating IMS IP Address to user & Create Bearers for SIP Signaling & VoWifi Call • P-CSCF server address discovery • Seamless handover of Voice or Video calls between VoLTE to VoWifi and vice versa
- 20. www.TelecomTutorial.info Role of HSSfor VoWifi PGw EPC SBC & P-CSCF TAS IMS ePDG CSCF MRF Untrusted WLAN (e.g. Home Wifi ) SGW SWu S2b SWm MME AAA SWx HSS PCRF EnodeB Adaptations in HSS for VoWifi • Existing VoLTE Supporting HSS will be Re-Used in VoWifi • Below Features needs to be supported • Swx interface support … Its between AAA & HSS • TADS Support for VoWifi • Authentication Support for VoWifi • Wifi RAT Type Support • Subscription for VoWifi Service
- 21. www.TelecomTutorial.info Role of PCRFin VoWifi PGw EPC SBC & P-CSCF TAS IMS ePDG CSCF MRF Untrusted WLAN (e.g. Home Wifi ) SGW SWu S2b SWm MME AAA SWx HSS PCRF EnodeB Adaptations in PCRF for VoWifi • PCRF Set up default and dedicated bearers between the PGW and the ePDG on the S2b interfaces for SIP and RTP traffic • The PCRF handles Gx and Rx Protocol which is vital in Call Maturing and Location Tagging in CDRs • PCRF plays critical role in NPLI to extract the UE public IP address and port
- 22. www.TelecomTutorial.info Role of IMSin VoWifi PGw EPC SBC & P-CSCF TAS IMS ePDG CSCF MRF Untrusted WLAN (e.g. Home Wifi ) SGW SWu S2b SWm MME AAA SWx HSS PCRF EnodeB Adaptations in IMS for VoWifi • For IMS Network , The Wifi will come as new RAT Type which needs to be supported • For Example , TAS CDRs will be having Wifi as RAT Type for VoWifi Calls . • The User IP & Port will be written in TAS Voice / Video Call CDRs • TAS also needs to support VoWifi TADS & VoWifi Charging . ASBC Needs to support VoWifi/VoLTE handover notification
- 23. www.TelecomTutorial.info www.TelecomTutorial.info How to ImproveQuality of VoWifi with Volumetric , CDRs & Analytics 5 SECTION VoWifi Experience
- 24. www.TelecomTutorial.info VoWifi VoWifi VoWifi VoLTE/ VoWifi VoWifi Measure VoWifi user experience Node KPIs • ePDG KPIs • AAA KPIs • PGW KPIs • HSS KPIs • IMS – TAS , SBC KPIs • Utilization Subs Data • Unique Users • Total Users Usage Data • Total Traffic • Total Incoming MOUs • Total Outgoing MOUs Per Subs Usage • mERL per Subs • Avg Call Duration • BHCA Per Subs Other IMS KPIs • RSR • Avg call setup time • Call Setup Success Rate • RTP Loss Key Metrics for VoWifi Customer Satisfaction + Business Metrics Separate Metric for every Internet Service Provider or Wifi Provider or Broadband Provider
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- 26. www.TelecomTutorial.info www.TelecomTutorial.info Re-Cap - Roleof UE - Untrusted WLAN UE Capabilities for Supporting VoWifi • USIM / ISIM • Hardware –Software Version • Operator based Binary Profile , Authentication & Security UE Tasks for VoWifi 1. Latching to Wifi Network 2. Discovering the ePDG using DNS 3. Establishing of IPSEC tunnel to ePDG 4. Performing SIP registration & make call UE Decisions in VoWifi • Default VoWifi Call (Y/N) ? • VoLTE-VoWifi Handover Allowed (Y/N)? • VoLTE / VoWifi thresholds on basis of Wifi performance – Wifi Signal , LTE Signal , Jitter / Packet loss / Packet Delay on Wifi Network
- 27. www.TelecomTutorial.info www.TelecomTutorial.info Re-Cap - Roleof ePDG - Untrusted WLAN ePDG Tasks - PGW Side • Landing point for traffic from Internet • IPSec/IKEv2 security & encryption • Transit Path to Mobile Core PGW • Facilitates PGW Selection • QoS mapping (DSCP Marking) • Lawful Interception. ePDG Tasks - AAA Side • Authentication & Authorization with AAA • Retrieves PGW address from AAA to facilitate VoLTE to VoWifi Handovers Considerations for ePDG • Security & Privacy • Service Parity • Integration • Network Integration & Deployment
- 28. www.TelecomTutorial.info www.TelecomTutorial.info Re-Cap - Roleof AAA - Untrusted WLAN AAA Tasks • Authentication of User using EAP-AKA & Retrieves authentication information from HSS .. Basically EPC access authentication and authorization on SWm & SWx Interfaces • Retrieves Subscriber profile from HSS • Updation & Retrieval of P-GW IP Address in HSS using S6b and Swx ( Required for VoLTE & VoWifi Handovers ) • Communicate Authentication information back to ePDG • In case Customer profile gets modified in HSS , The HSS Communicates same to AAA & further it is enforced to UE by ePDG • Register itself in HSS for every authenticated and authorized user • Purge the User if Required as per Lifecycle or Profile changes
- 29. www.TelecomTutorial.info www.TelecomTutorial.info Future Reading &References - 3GPP TS 23.402 - Architecture enhancements for non-3GPP accesses - Covers Complete Architecture in Detail such ePDG etc.. , important Document for enhancing knowledge on VoWifi - 3GPP TS 29.273 - 3GPP EPS AAA interfaces - AAA Links , Descriptions , Format & Usage
- 30. www.TelecomTutorial.info Get PPT Nowwww. TelecomTutorial .infoVikas Shokeen LIKE COMMENTSHARE