Telco technical

& business courses

available worldwide

LTE and LTE Roaming

roaming engineers
available worldwide
available online
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Who Should Attend?

This training is targeted at engineers who want to see how roaming evolves together with LTE. It presents different aspects of roaming, including procedures, protocols, and billing.


Course Scope

  1. Roaming architecture.
    • LTE/EPS nodes.
    • LTE/EPS inter-operator interfaces (Gr, Gp, S6, S8, S9, Gy).
    • Mode of operation.
    • IMS architecture.
    • GSMA IR65 and IR88.
  2. Diameter introduction.
    • Diameter Baseline Protocol.
    • Functional nodes (client, server, proxy, etc).
    • Diameter Routing Agent.
    • Routing in Diameter (realms, FQDN).
    • Transport (SCTP/IP).
  3. Policy and Charging Control.
    • Principles and evolution.
    • Architecture.
    • PCC and SAE.
    • Binding (bearer, session, rules).
  4. SAE mobility and roaming scenarios.
    • Home routed traffic.
    • Home control and visited breakout.
    • Visited control and visited breakout.
    • S8 vs Gp for interconnect.
    • Access control in VPLMN and HPLMN.
    • Attach and TAU.
    • EPS bearer activation - GTP, S8.
  5. IPX.
    • Architecture and functionality.
    • Border nodes - BG, FW, SEG.
    • Connectivity options - IPX vs GRX.
    • DNS for GGSN/PGW selection.
    • Diameter apects (architecture, DRA, edge agents).
    • Network Domain Security (NDS).
    • QoS handling in IPX.
  6. SAE charging architecture.
    • Charging identifiers.
    • LTE charging architecture.
    • TADIG and IREG.
    • Changes in TAP files for LTE.
  7. IMS roaming and interconnect.
    • IMS roaming scenarios.
    • VoLTE call.
    • Border nodes - IBCF and TrGW.
    • Finding CSCFs in IMS.
    • ENUM procedures.
    • Non-IMS scenario for voice and SMS.
  8. Rich Communication Services.
    • RCS 5 Architecture (GSMA IR92).
    • End-to-end RCS architecture.
    • RCS device modes, client types, and device architecture.
    • RCS registration procedures.
    • RCS services.
    • RCS interworking.


Course Objectives

This training contains a technical overview of LTE technology with related functionality (VoLTE, RCS) with regards to roaming. It covers specific traffic cases, explanation of architecture supporting different roaming scenarios, anlysis of protocols. Changes to billing process are also explained.



Familiarity with LTE/IMS mobile networks will be helpful, but is not required.


Training Structure

Three-day training divided into logical sessions.



Instructor-led training, presentation, workshops based on examples prepared by the trainer, and discussions of actual problems in the participants' companies.

Course covers all important issues and presents relevant examples.

Mr. Mohamed Kamel, Vodafone Egypt

I received a lot of useful information which I use in my work every day.

Ms. Viktoriya Gusarova, Beeline RU

Training provides useful methods to analyze real protocols.

Mr. Seema Karn, NCell Nepal

Trainer adapted to the expectations of the audience.

Mr. Antoine Blanchet, Monaco Telecom

I can proudly recommend these courses for others as well.

Mr. Tarvo Jammer, Elisa Estonia

This course will be very useful in my daily work.

Mr. Leopoldino Ferreira, Unitel Angola

Everyone gets individual attention from the trainer.

Ms. Inga Tomsone, Tele2 Latvia

A clear picture of GSM switching and signalling.

Ms. Anette Chale, mCel Mozambique

The training is completely excellent.

Mr. Philipp Korostelev, Beeline Moscow

I am very impressed with the trainer's knowledge and experience.

Mr. Mouin Al Saghir, Vivacell

The trainer is capable of answering all my questions.

Ms. Ana Gheorghe, Vodafone RO

Very effective training methods.

Ms. Erjona Xhemali, AMC Albania

Overwhelming knowledge and expertise. Interactive and enjoyable learning.

Mr. Ashish Shrestha, NCell Nepal

Great teacher with deep knowledge and experience.

Mr. Philippe Wrzecionek, TATA

Good class notes and great examples.

Mr. Ghaffar Masood, Mobilink Pakistan

The whole course was very valuable.

Mr. Sayyid Ali, Dhiraagu Maldives

Really practical and very fruitful training.

Mr. Niroj Raya, NCell Nepal

I feel like the trainer is the best professor and mentor one can have.

Ms. Ledia Meici, AMC Albania

Excellent, knowledgeable trainer, open to communication.

Mr. Dmitrii Kropotov, Tele2 Russia

More than excellent course!

Ms. Inessa Mijiferjyan, Vivacell

The course exceeded my expectations. Hats off!

Mr. Adnan Syed, Mobily

The course covers all the impacted areas.

Ms. Gratia Scanteie, Vodafone, RO

Trainer is open for comments and discussion.

Ms. Natalya Nerubenko, Life Ukraine

Training was above expectations!

Mr. Ariel Haxhiu, Eagle Mobile, AL

A good approach to a complex problem.

Ms. Horia Catrinoiu, Vodafone RO

Professional, high-quality trainer.

Mr. Gagik Shatveryan, Vivacell

A lot of useful materials and knowledge.

Mr. Shukhrat Khaydar, UCell

Perfect course.

Mr. Arseniy Mazanik, Beeline Russia

Excellent exercises!

Mr. Muhammad Ali, Mobilink Pakistan

Trainer was able to answer practical questions.

Mr. Daniel Krolikowski, Play Poland

Experienced trainer. Excellent descriptions.

Mr. Ahmad Doar, Mobily, KSA

Regardless of technology I received theoretical and practical answers.

Mr. Kosta Pribić, T-Mobile Croatia

Good logical structure of the course and explanation.

Ms. Elena Shevtsova, Beeline, KZ

Excellent methodology of teaching. Simple and easy to understand training.

Mr. Arben Shabani, PTK Kosovo

The best training ever.

Mr. Timur Zagretdinov, MTT Russia

Deep and detailed topic analysis.

Mr. Mohamed Sabry, Vodafone Egypt

Unique training covering the most important areas of my work.

Mr. Eldar Mursaqulov, Azercell

Trainer understands local market experience.

Mr. Andrew Sweetman, Wataniya

Very clear explanations.

Ms. Tatyana Krasyuk, Life Ukraine

Many different people from different operators can share their problems and ideas.

Mr. Omar El-Fiky, Vodafone Egypt

Very well organized training programmes.

Mr. Mihnea Teodorescu, Cosmote, RO

Good direct connection between course material and real problems.

Mr. Alex Konstantopoulos, Cosmote, GR

Highly professional trainer with lots of practical experience. Friendly and open.

Ms. Olga Rudnicka, Tele2 Latvia

Trainer understands local market experience.

Mr. Andrew Sweetman, Wataniya

Excellent knowledge from the trainer.

Ms. Catherine Barman, Swisscom

Seminar entirely for Telecommunication operators. A lot of issues covered.

Ms. Pinelopi Tragoudara, Vodafone GR

The training exceeded my expectations.

Ms. Irida Gjashta, AMC Albania

Experienced trainer. Real cases with references to recommendations.

Mr. David Curkan, T-Mobile Croatia

Excellent course and instructor.

Mr. Nikolay Suetin, Beeline Russia

Amazing, more than excellent, audience-oriented trainer.

Mr. Evgeniy Dmitriev, Astelit Ukraine

Trainers have passion to teach & impart knowledge.