VoLTE Core Network Course...

Timmins Training Consulting Sdn. Bhd,

Suite A27-07, 8 Jalan Cendana, Kuala Lumpur, Malaysia, 50250 Office: +60.3.2785.0737 Mobile: +60.11.3529.5347 email: [email protected]

Timmins Training Consulting

VoLTE – Core Network Course Outline

Short Description

VoLTE stands for voice over Long-Term Evolution. It is a combination of LTE and IMS technology

which enables processing of digital packet voice service that is delivered over IP

VoLTE course covers technical aspects of how voice is harnessed in LTE Networks by leveraging the

IMS solution .This course would cover comprehensive information of VoLTE architecture, Standards,

protocols, QoS, interfaces, interworking, SRVCC,T-ADS,Charging and Call flows

Course Objectives:

• Module 01: Introduction to VoLTE

• Module 02: EPS Overview

• Module 03: IMS Core for VoLTE

• Module 04 : PCRF/PCEF in VoLTE solution

• Module 05: Protocols in VoLTE – SIP, Diameter, RTP, H.248,GTP,NAS

• Module 06 :VoLTE Subscriber Access, Authentication and Registration

procedures

• Module 07: Application server

• Module 08: SR-VCC(Single Radio Voice Call Continuity) and T-ADS

• Module 09: Charging concepts

• Module 10 : VoLTE Call Flows




Teaching Tools:

• Slides

• Whiteboard

• Q&A (End of each module)

• Wireshark pcap traces

• Group discussion (Post lunch/Each Day)

• Case study

• Screenshots of Vendors Products for configuration parameters (As Applicable)

Duration:

3 days ( 8 hours / Day with two 15 min break and 1 hour lunch break)

Target group:

a) Telecom Professionals who are from LTE, EPC, Radio, Core Network operations, engineering,

planning verticals.

* This training should also benefit working Engineers/Associates from CS Core Network & Packet

Core domain who would like to learn VoLTE and upgrade their knowledge

Prerequisite

Basic knowledge of GSM, WCDMA, Core network, LTE, UMTS or telecom in general

Pre- Course Preparation: Participants are advised to do pre reading on below topics:

- Basic GSM, WCDMA, LTE Architecture

- Basic SIP knowledge (optional)

- SS7 protocols i.e. ISUP, MAP

Assessment:

Pre-and Post-Assessment Questionnaire.

Note: Participants are advised to go through Pre- Assessment test before the Course commences.




Learning outcomes:

• Understand role of the LTE-Evolved packet core, Policy & Charging Control and IP Multimedia

System (IMS) in LTE networks

• Chalk-out IMS and various nodes and how those nodes interact to deliver an end-to-end VoLTE

call

• Summarize the key steps of pre-call operations including default bearer establishment and IMS

registration

• Understand main steps of setting up a VoLTE call.

• Understand the important protocols used within the LTE and IMS networks for VoLTE solution

• Understand the concepts of SR-VCC,T-ADS ,Charging in VoLTE Solution

Module List Detailed

Module 1: Introduction to VoLTE ( 45 mins) * Module Shortened

Topics discussed in this module are listed below:

• What is VoLTE?

• GSMA IR.92

• VoLTE Drivers

• Voice evolution from Circuit switched to LTE

• Voice Evolution – 3GPP Release

• 3GPP Release 8 Network Architecture

• LTE Voice Solution Alternatives

• Overview of CSFB and other voice alternatives

• Logical Components of VoLTE Solution

• VoLTE Roadmap

Teaching Tools : PPT, Whiteboard, Q&A

Case Study : Advantages of VoLTE over CSFB and OTT ie.Skype,WA

Exercise: Breakdown the various nodes in EPC and IMS from VoLTE Architecture

Module 2: EPS Overview (45 mins) ** Module Shortened


• EnodeB Introduction and Functions

• EPC Overview and architecture

• Network nodes and roles of HSS,MME,S-GW,P-GW,PCRF

• Basic EPS signaling procedures

• Key Reference points: S6a, S1-C/U, S5/S8 S6, S10 and S11




Teaching Tools: PPT, Whiteboard, Q&A

Exercise: Reference points and List Key components in EPC for VoLTE , Role Plays

– Participants as EPC Network elements

Module 3: IP Multimedia Subsystems - Core for LTE ( 4.5hrs)


• IMS Standardization: 3GGP, 3GPP2, TISPAN,OMA,IETF

• IMS Core Architecture and Network elements

• IMS Layers - Access Layer, Transport Layer, Control Layer, Application Layer

• VoLTE Network Configuration with IMS

• Numbering and addressing/IMS Identifiers/Subscription – IMPI,IMPU,SIP URI,TEL URI,PSI

• IMS Interfaces and Protocols

• IMS Core Enablers – (P/I/S/E-CSCF)

• MMTel Server introduction (Application Server)

• IMS Database HSS/SLF basic procedures

• Function of DNS/ENUM in IMS Solution (Session Routing on domain or number)

• Breakout / IMS-PLMN/PSTN Interworking via MGCF & IM-MGW

• IMS Media Enablers MRFC/MRFP (Media Controller and processor)

• Border Function - SBC, SBG in IMS (Session Border Controller ) ,IBCF,TRGW

Teaching Tools: PPT, Whiteboard, Q&A, Screenshots of IMS and VoLTE Subscription

Case Study on Various Access Scenarios(IP-CAN) for IMS.

Exercise: Identify the Key identifiers for IMS Subscription for VoLTE Subscriber.

Module 4: PCRF/PCEF and QoS in VoLTE solution (2 hrs)


• PCC architecture

• PCRF, PCEF Interaction

• Interfaces: Gx, Rx interaction for QoS

• Use of SDP in VoLTE Call QoS

• Bearers in EPC – Default and Dedicated

• GBR and Non-GBR for services

• Standardized QCIs for SIP/IMS Signaling

Teaching Tools: PPT, Whiteboard, Q&A, Screenshots and Wireshark for QoS,APN’s,

Exercise and Case Study on important QCI for VoLTE session/call




Module 5: Protocols in VoLTE (4 hours)


• SIP and SDP

• Diameter

• RTP and RTCP

• H.248 (Megaco)

• NAS

• GTP

Teaching Tools: Extensive Exercise based Protocol Structure via Wireshark trace, Q&A,PPT

and Whiteboard

Exercise: SIP Method and Response codes for VoLTE Call, Diameter Messages

Module 6: VoLTE Subscriber Authentication, Access and Registration (3 hours)


• PDN connection (UE Attach and Location update)

• Authentication in EPC

• IMS APN Download from HSS

• Default EPS bearer setup for IMS

• P-CSCF Discovery (VoLTE Service Discovery)

• UE Authorization, IMS AKA Authentication and Registration in IMS

• IFC(Initial Filter criteria)

• 3rd Party Registration in IMS

Teaching Tools: Extensive Exercise based on Wireshark trace ,Q&A,Whiteboard

Exercise: Identify the important procedures in pcap files for UE Attach, P-CSCF Discovery

and IMS -AKA

Case Study: APN for VoLTE

Module 7: Application server (1 .5 Hours)


• Service architecture and role of AS (IM-AS, IM-SSF,OSA-SCS)

• MMTel /TAS Server – VoLTE Call Service Execution

• Overview of Basic /supplementary/MMTel services




• SMS Engine in VoLTE

• SMS Delivery flow in IMS – MO/MT

• PSI (Public Service Identifier

• SCC-AS

• AS (Online charging interaction)

Teaching Tools: PPT, Whiteboard, Q&A, Screenshots of MMTeL services

Exercise: AS Interaction with HSS to download Subscriber VoiP Subscription/MMtel Services

Module 8: SR-VCC (Single Radio Voice Call Continuity) and T-ADS (1 hr ) hrs.


• Need of SRVCC in VoLTE

• Network elements in SRVCC Procedure

• 3GPP Rel 8 and 3GPP Release 10

• SRVCC concept

• eSRVCC

• ATCF and ATGW

• SRVCC call flow

• T-ADS(Terminating – Access Domain Selection concept and call flow

Teaching Tools: PPT simulations, Whiteboard, Q&A. Wireshark Exercise: Difference and Benefits of eSRVCC over SRVCC, Benefits of T-ADS

Module 9: Charging (1.5hrs)


• Charging architecture and interfaces

• Offline Charging and functional elements

• Offline Charging and functional elements

• Session and Event based charging

• CDR generation

• CDR’s – Event and Session based

• Charging correlation

• Examples

Teaching Tools : PPT simulations, Whiteboard, Q&A, Exercise ,Charging flows and

examples

Exercise: Recognize charging elements involved in various call scenarios.




Module 10: VoLTE Call Flows (1.5 hrs)


• Voice call setup in IMS and QoS negotiation in EPC

• IMS to IMS, IMS to PSTN /PLMN, PLMN/PSTN to IMS

• VoLTE Emergency calls network elements and call flow (EPC and IMS)

• VAS Call Flows – Call forwarding, Voice mail, RBT

Teaching Tools: PPT simulations, Whiteboard, Q&A, Exercise on QoS Negotiation in SDP,

Call flows

Exercise: Search parameters in trace which identify “Normal vs Emergency calls”

End of Course Case Study: IMS Deployment Discussion

a) Here the VoLTE Network Deployment, Load balancing, P-CSCF clusters, IBCF clusters and BGWs are deployed in IMS domain

b) How does P-CSCF choose the I-CSCF based on domain resolution.

c) In a typical VoLTE network, How does the Traffic is routed in IMS from a PLMN/Circle network

VoLTE Core Network Course...

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