Voice over LTE (VoLTE) Signaling Analysis

Voice over LTE (VoLTE) Signaling Analysis will offer delegates a good presentation and deep understanding on IMS, SIP signaling, Diameter, H.248 MEGACO, MMTel server, VoLTE E2E signaling analysis, SIP to SIP call flow, SIP to PSTN call flow.

Aimed At

Course Review

Why Choose this Course

You will learn

Course Outline

Training Format

FAQ's

Customer Tailored

We can tailor the included topics,tech level,and duration of this course right to your team’s technical requirements and needs. - MCNS offers courses to companies, institutions, departments etc and not to individuals as per open courses.

Aimed At

Voice over LTE (VoLTE) Signaling Analysis is aimed at a technical audience who want to get some insight into VoLTE IMS signaling procedures. It is also suitable for technical professionals, RAN operators, Radio planning engineers, Technical managers who currently are or will be involved in VoLTE IMS signaling analysis and troubleshooting. Finally students, researchers and technical consultants into various other fields than VoLTE technology, will find this course valuable to fill the gap for a comprehensive and complete LTE VoLTE optimization and troubleshooting.

Prerequisites: In order for the attendant to better understand the content of this topic and to gain a further insight into VoLTE IMS signaling messages and procedures, a prior knowledge on LTE RAN network, LTE signaling as well as VoLTE solution is recommended.

Course Review

This LTE(4G) course introduces audience into VoLTE – IMS technology with emphasis on VoLTE E2E and IMS signaling analysis. SIP signaling is one of the most important signaling protocols in IMS VoLTE and it is properly introduced with all relevant details for SIP messages, addressing, transactions, routing and signaling code analysis. IMS platform and signaling procedures are fully and in details described, focusing also on MMTel server for the Voice service provisioning. Diameter is also covered with reference to IMS databases and servers. Finally a full E2E signaling call flow for SIP to SIP or SIP to PSTN is analyzed with a lot of details. The course material is supported by extended and detailed trace log files and exercises with full analysis on the message flows and contents.

Course Benefits for individuals (Professionals)

Understand basics of VoLTE and IMS signaling flows and procedures.
Make the connection between LTE RAN, LTE EPC core and IMS signaling protocols, interfaces and messages
Learn how to troubleshoot VoLTE using signaling analysis
Optimize LTE VoLTE service provisioning

Course Benefits for your Organization

Equip organization engineers with the necessary knowledge of LTE VoLTE and IMS signaling analysis
Develop rules of thumb and procedures on VoLTE IMS optimization and troubleshooting for fast and efficient network performance
Capitalize the organization network VoLTE enhanced performance from market and customer’s positive experience and perception
Keep ahead of competitors in preparing your network for superior LTE Volte services.
Prepare for future network expansions and quality performance optimization

You will learn

The key points you will learn through this course

VoLTE Introduction

IMS technology overview

VoLTE IMS Signaling

Course Outline

A short brief of your program details & schedule

LTE EPC review

LTE network architecture overview
EPC architecture
EPC node description
LTE RAN to EPC network deployments

Voice over LTE overview

VoLTE Solution in LTE
VoLTE architecture and deployment
VoLTE e2e solution (EPS and IMS)
VoLTE interfaces
VoLTE calls – review
Optional feature – CSfallback (overview, concepts, details)
Feature – SRVCC (IRAT handover concept and execution

IMS platform

Why IMS?
IMS consortium
IMS standardization
IMS architecture
IMS Node elements
IMS service platforms
IMS MMtel solution for voice traffic
Introduction to IMS signaling

IMS signaling

IMS architecture within LTE/3G
IMS nodes and components
IMS interfaces
IMS MMTel nodes
IMS MMTel basic services, suppl services,
IMS MMTel registration, session establishment,
IMS MMTel identifications, addressing, numbering,
IMS MMTel routing, policing control
IMS signaling – e2e presentation
IMS session setup, establishment, release
IMS SIP procedures
IMS registration/authentication
Exercisers with signaling log files

SIP signaling

SIP signaling overview
SIP in MSS
SIP transport
SIP message contents – headers and SDP fields
SIP addressing
SIP transactions
SIP message format
Call setup and release using SIP in MSS
SIP media encoding, transport and security considerations
SIP protocols interwotrking (SIP-ISUP, SIP-BICC)
SIP routing
SIP signaling code analysis
Exercises with signaling log files

Diameter

Diameter in general (terminology etc)
Diameter routing (general principles, routing in IMS)
Diameter error handling
Diameter in transport domain
RF/RX interface
Diameter message format and protocol
Exercises with signaling log files

VoLTE signaling examples

248 MEGACO
248 specifications and interfaces in IMS
248 messages and signaling
248 streams
SIP to SIP session
SIP to PSTN session
Signaling trace log files analysis
VoLTE troubleshooting examples and discussions

Training Format

Instructor-Led Training

On-Site Classroom: 3 days

Web delivered (Virtual): 3 days

Excellent and descriptive course material (pdf file) will be provided

FAQ's

How does VoLTE service affect LTE UL interference?

In typical LTE networks where the dominant service is IP MBB traffic, most of the usage is in the downlink direction. As the uplink usage is much lesser so uplink interference is much lower and this has encouraged many vendors to use more aggressive uplink power control algorithms. However, when VoLTE users start to increase, they have an almost equivalent UL/DL utilization so, as the VoLTE usage increases, the uplink interference increases and the impact of interference is higher on VoLTE since it is a UM (Un-acknowledged RLC Mode) service with a very strict delay budget. Therefore, as an optimization hint it is a good idea to revisit uplink power control parameters and interference margins as the VoLTE usage increases.

What is DL RLC Radio Link Failure and how it relates to VoLTE Drop calls?

The most common drop pegged under Radio issues is the drop due to RLC retransmissions. If a network has a parameter related maximum of 16 RLC retransmissions for downlink, the eNB will send a message 16 times at the RLC layer and if the UE is unable to decode it or send an acknowledgement, the eNB will consider this as a Radio Link Failure (RLF). Some vendors initiate a UE Context Release at this point resulting in an abnormal release and a call drop. Some vendors wait for a bit longer (an internal timer T311) for the UE to initiate RRC ReEstablishment and if there is no RRC ReEstablishment then the eNB will release abnormally and radio induced call drop will be pegged.

How VoLTE Drop call due to DL RLC Radio Link Failure can be improved?

This issue is mostly due to coverage and quality problems. So, the best way to sort this out is to improve radio conditions which is usually done with physical optimization. Increasing RLC retransmission threshold to a higher value might also help in reducing this issue.

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Voice over LTE (VoLTE) Signaling Analysis

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