Training Solutions

Voice and IMS in LTE

The LTE Evolved Packet System (EPS) is an evolution of the 3GPP system architecture with the vision of an all-IP network finally realized. However, supporting some of the most revenue generating Circuit-Switched (CS) services such as voice and SMS is a key challenge for LTE service providers. Several options exist, such as voice using VoIP in IMS framework, CS Fallback, SR-VCC and the non-standard solution of Voice in LTE over Generic Access (VoLGA). This courses describes network components such as EPC, IMS and PCC and how they come together to support VoIP in LTE. It covers the associated interfaces and protocols and then walks through call setup scenarios for VoIP calls, CS calls as well as hybrid VoIP/CS voice calls as the UE moves from LTE to non-LTE access networks.

Learning Objectives

After completing this course, the student will be able to:
• Sketch the EPC architecture for CS and PS services
• Sketch the IMS and PCC architectures and their interactions with LTE
• List various solutions to support voice and related CS services in LTE
• List and describe key protocols of VoIP and IMS such as SIP/SDP, RTP/RTCP and Diameter
• Describe the key steps prior to VoIP/IMS call setup
• Step through the VoIP/IMS call setup in LTE
• Step through the CS Fallback call setup in LTE
• Step through voice calls in the SR-VCC and VoLGA framework
• Draw the handover procedures between LTE and 2G/3G for SR-VCC and IMS
• Describe how SMS is supported in LTE networks

Intended Audience

This course is designed for those involved in integration, deployment and engineering of LTE-EPC wireless systems that support CS services.

Suggested Prerequisites

• LTE Overview (eLearning)
• LTE SAE Evolved Packet Core (EPC) Overview (eLearning)
• LTE-EPC Networks and Signaling (Instructor Led)

Course Length

2 Days Instructor Led

Course Outlines / Knowledge Knuggets

1. LTE-EPC Network Architecture
1.1. LTE-EPC network architecture
1.2. Roles of HSS, MME, S-GW, P-GW and HSS
1.3. Support for PS services

2. Voice and SMS in LTE
2.1. Voice support landscape in LTE
2.2. Voice over LTE (VoLTE)
2.3. CS fallback
2.4. SR-VCC
2.5. VoLGA
2.6. Emergency calls using the IMS and CS domains
2.7. SMS over IP architecture
2.8. SMS over IP and SMS over SGs

3. IMS and PCC in LTE-EPC
3.1. IMS and PCC architecture overview
3.1.1. CSCF, MGCF, MGW and HSS
3.1.2. PCRF, PCEF and SPR
3.2. Addressing in IMS
3.3. IMS VoIP call scenario in LTE

4. Protocols for VoIP and IMS
4.1. SIP and SDP
4.2. RTP and RTCP
4.3. Diameter and related interfaces
4.4. Role of IPv4/IPv6 in LTE-EPC
4.5. End-to-end signaling and traffic flow

5. Pre-Call IMS Functions for VoIP
5.1. PDN connection for IMS APN
5.2. Default bearer setup
5.3. P-CSCF discovery
5.4. IMS registration

6. VoIP Call Setup in LTE-IMS (VoLTE)
6.1. Mobile-originated call
6.2. Dynamic PCC interactions
6.3. Dedicated bearer setup
6.4. SRB and DRB on RRC connection
6.5. Voice media considerations

7. CS Fallback for Voice in LTE
7.1. Attach in LTE and 2G/3G network
7.2. Mobile-originated and mobile-terminated call walk-throughs
7.3. SMS over SGs

8. SR-VCC
8.1. SR-VCC architecture
8.2. Voice call continuity walk-through
8.3. LTE/3G/2G handovers

Appendix A1: VoLGA
A1.1 VoLGA architecture
A1.2 Voice call walk-through in VoLGA

CATALOG

Download our course catalog!

2010 Catalog,
pdf format (7.8 MB)