Vikas Shokeen

Section # 1 (Evolution of Telephony) · Difference between 2G / 3G –vs- 4G Non-VoLTE –vs- VoLTE Networks · Services in Non-VoLTE 4G Vs VoLTE Networks · The Problem with 4G (Non-VoLTE) Network? Section # 2 (Voice Service Flow) · Call in CS Core 2G / 3G Networks · Call via CSFB where VoLTE is not available along with 4G · Call in VoLTE where both 4G & VoLTE exists Section # 3 (SMS Service Flow) · SMS in CS Network: Using 2G / 3G · SMS over SGs: SMS transit via SGs Link between 4

SWu Interface - Internet Key Exchange version 2 (IKEv2), RFC 7296. We will also cover IPSEC Overview here S2b Interface - GTP Protocol, PMIP (Proxy Mobile IP), 3GPP TS 29.274 SWm Interface – Diameter Protocol, 3GPP TS 29.273 SWx Interface – Diameter Protocol, 3GPP TS 29.273 S6b Interface – Diameter Protocol, 3GPP TS 29.273 Protocols SWu Interface This Interface is used between ePDG and UE SWu interface is running on IKEv2 – i.e. Internet Key Exchange It uses IKEv2 protocol to

VoWifi Nodes Role of ePDG , AAA & UE Role of PGW , HSS , IMS , PCRF for VoWifi KPI & Performance of VoWifi Measure User Experience of VoWifi Nodes Required for VoWifi Untrusted WLAN We are going take deep dive on Untrusted Wireless LAN Architecture where we will review function of various nodes used to Offer VoWifi Service to users. Since traffic is coming via Internet in this Model, there is utmost need to protect & safeguard traffic from security point of view. We need to i

- VoWiFi Architecture VoWiFi Framework VoWiFi Overview - Various Architecture Options for Wifi Calling Untrusted WLAN Trusted WLAN IMS Direct Access - 3GPP Vs Non-3GPP Access - VoWifi Nodes overview - New & Existing Ones Section # 1 In First Module, we are going to cover the basics of VoWifi & will see which all types of Wifi Access is supported for running Wifi Calling service VoWiFi means the Wifi is used instead of 4G radio waves to transmit speech. It helps VoLTE users to

Why you need Vo-Wifi ? Or Wifi Calling ? How to avail VoWiFi Service ? Role of Mobile Operator in VoWiFi Service ? How to enable VoWifi on your Phone ? VoWifi - Benefits for Customers & Mobile Operator Vo-Wifi Challenges & Risks Why you need Vo-Wifi? Or Wifi Calling? The biggest frustration for Mobile users is Weak coverage. Specifically, when you are inside house or office, Weak coverage will bring new level of frustration in your life. As you can see in Diagram (above), Hou

RSR : Registration Success Ratio (%) - CSSR : Call Setup Success Rate (%) - CST : Call Setup Time (s) - MHT/ACD : Average Call duration (s)

Sh , Ro , Cx , Rx , Sv , ISC , Mw , Mg , Mi , Mj , Mr / Mr‘ , UT,S1MME , S5/S8 , S10 , S11 , S6a , Gx , Gy , X2 , SGs , S1U , S5/S8 & SGi ,

Single Radio Voice Call Continuity (SRVCC) - CSFB (circuit switched fallback) - PS to CS handover - CSFB Vs SRVCC - SRVCC , aSRVCC , eSRVCC

Network Evolution to VoLTE , VoLTE - Benefits for Users , Operators . VoLTE Challenges & Handling Congestion Scenarios