Voice Over 5G

Vo5G, or Voice over 5G, refers to the voice and video communication services enabled by the 5G mobile systems. While 5G's evolution is primarily driven by data services, voice and video communication remain crucial for its success.

In the initial phase of 5G deployment, voice and video services are delivered over LTE networks using the IMS (IP Multimedia Subsystem) platform. This technology is known as VOLTE (Voice Over LTE) in 5G non-standalone deployment. As 5G advances, the focus shifts to the new 5G radio access technology,  known as NR (New Radio), which enables VoNR (Voice over New Radio) as the next-generation solution for delivering voice and video services.. VoLTE and VoNR represent different access modes for delivering IMS-based voice and video communication services.

The transition from VoLTE to VoNR marks the evolution of Vo5G, which goes beyond traditional calls. With Vo5G, improved voice and video services will integrate seamlessly into a variety of 5G-enabled applications, such as augmented reality (AR), remote robotics, and immersive entertainment platforms like gaming and streaming.

This course delves deep into the technical intricacies of Vo5G, providing a comprehensive understanding of how voice and video services are evolving alongside 5G technology. Here is the outline of the course:

Section 1: Introduction

• Introduction

• Three main Components of a Mobile Network

• Evolution of Voice Services: From 2G to 5G

• GSMA Profiles for Voice over LTE and 5G

• Technology Timeline and Key Milestones

• Voice Over 5G Solutions

Section 2: Review of Important 5G Deployment Options

• What is Dual Connectivity?

• 5G Standalone Option 2

• 5G Non-standalone (NSA) Option 3

• 5G Non-Standalone (NSA) option 4

• 5G Non-Standalone (NSA) option 7

Section 3: Overview of Voice over 5G Solutions

• Types of Voice Solutions in 5G

          1. Voice Over LTE (VOLTE) in 5G NSA deployment

          2. VOLTE using Fallback Mechanism

          3. Voice Over 5G NR (VONR)

• Voice Services in 5G Deployment Option 4 & 7

Section 4: IMS the Bigger Picture

• What is IP Multimedia Subsystem (IMS)?

• IMS Features

• IMS Architecture-Different Layers

• Call Session Control Functions (CSCFs):

  • P (Proxy)-CSCF

  • I (Interrogating)-CSCF

  • S (Serving)-CSCF

• Application Servers (ASs) in IMS

• Protocols Used in IMS

• Session Initiation Protocol

• Services Provided by SIP

• SIP Methods

Section 5: High Level IMS Procedures

• IMS Connectivity Requirement

• Protocol Data Unit (PDU) Session for IMS Connectivity

• Integration of IMS in 5G

• IMS Registration: P-CSCF Discovery

• Signal Flow for UE Registration with IMS Network

• 3rd Party Registration in IMS

• End-to-end Signaling Path For call setup

• End-to-end SIP Signaling for Call Setup and Media Bearer Establishment

• IMS Media Bearer Tear Down

Section 6: Voice Codecs for VOLTE & VONR

• What is a Speech Codec for Voice Over IP?

• Voice Codecs in 4G/5G

• Enhanced Voice Services (EVS) Codecs & Operating Modes

Section 7: 5G System Specific Procedures for IMS Voice Call

• Why N26 Interface is Important?

• UE Registration Modes

          1) Single Registration with N26 Interface

          2) Single Registration without N26 Interface

          3) Dual Registration Mode

• 5G Registration With Focus on Voice Aspects

• End-to-End VONR Call Flow

• EPS Fallback-High Level Signaling

• EPS Fallback Mechanism Types

• Comparison of EPS Fallback Mechanism Types

• EPS Fallback-5GS to EPS Handover with N26

• EPS Fallback-5GS to EPC Redirection with N26

• RAT Fallback-High Level Signaling

• VOLTE in 5G NSA (EN-DC)

• VOLTE High Level Signaling