Vikas Shokeen

Building Concepts for Lifetime – Simplifying Technology & Specs

This is a Non-Profit Site aimed at Demystifying 3GPP telecom Specs in simplified version

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08 - VoLTE Evolution (New)

Nov 7, 2020
9 min

08 - VoLTE Evolution (New)

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

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04 - VoWifi Interfaces Links Protocols (New)

Nov 7, 2020
7 min

04 - VoWifi Interfaces Links Protocols (New)

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

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03 - VoWifi ePDG AAA and Architecture (New)

Nov 1, 2020
13 min

03 - VoWifi ePDG AAA and Architecture (New)

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

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02 - VoWifi Architecture Overview (New)

Oct 30, 2020
10 min

02 - VoWifi Architecture Overview (New)

- 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

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01. VoWifi Introduction & What is Wifi Calling ? (New)

Oct 30, 2020
12 min

01. VoWifi Introduction & What is Wifi Calling ? (New)

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

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07. VoLTE IMS KPI & Performance

06. VoLTE Interfaces , Protocols & IMS Stack

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

01. What is VoLTE – IMS Overview , Basics & Fundamentals