inflearn logo

5G/LTE Call process(focus on device)

A practitioner with over 25 years of experience in device verification and commercialization in the telecommunications field provides a detailed explanation of the entire 5G/LTE call-processing flow, centered on device protocols. Starting with the basic structure of the UE–Network Interface, the content systematically connects the access, registration, data paths, and mobility procedures of LTE, NSA, and 5G SA from the fundamentals onward. Through diagrams and examples of RRC and NAS messages, complex procedures are organized systematically to help readers quickly understand the overall flow and grasp the key concepts.

3 learners are taking this course

Level Basic

Course period Unlimited

5g
5g
5g
5g

What you will gain after the course

  • Explains LTE Initial Access, Attach, EPS Bearer, and Mobility in the order of UE RRC/NAS messages.

  • In NSA EN-DC, NR Measurement, SgNB Addition, and SCG setup, modification, and release are distinguished.

  • Connects the Cell Search, RRC Connection, Registration, and PDU Session procedures for 5G SA.

  • Read the key fields of the public decoded message and the expected responses for each procedure to verify the normal call-handling flow.

Recommended for
these people

Who is this course right for?

  • Communications majors learning LTE/5G device call processing for the first time, and beginners in device development and verification

  • A telecommunications professional looking to organize the corresponding RRC·NAS messages and their sequence for LTE·NSA·SA.

Need to know before starting?

  • Knowing basic mobile communications terminology will help you understand this.

  • The message-reading example will be conducted using the instructional materials, and no separate measurement equipment or paid analysis tools are required.

Hello
This is Kihong

Career Verified

Hello. I’m Kim Kihong (Kihong), sharing my experience in telecommunications technology and global careers.

With more than 25 years of experience in telecommunications at KT, AT&T, and Samsung Electronics’ U.S. subsidiary, along with eight years of work experience in the United States, I break down complex technologies and practical challenges in an easy-to-understand way and work with you to find actionable directions.

My main areas of focus are 5G system architecture and communication protocols, requirements organization and validation, and business communication with global teams. I explain concepts by connecting architecture diagrams with real-world workflows and aim to help learners apply what they learn to their own work.

For those preparing for jobs at U.S. big tech and technology companies, I provide 1:1 consulting based on more than 100 job interview experiences. Together, we review how to connect your target role with your career background, as well as your English résumé, LinkedIn profile, and potential interview questions and answers.

I run Kihong Story Lab, where I personally create AI-powered tools and produce and publish content. I also share my experience creating two books—a vibe coding book and a novel—in multiple languages and distributing them across platforms such as Amazon, Apple Books, and Google Play Books.

Based on my global patent experience, I had my NIW petition approved in just four months. I share my experience preparing and organizing my technical career and achievements, but this is a personal case and does not guarantee the approval or processing time for other applicants.

Rather than simply conveying my experience one-way, I aim for conversations where we review your current goals and materials together and clearly organize the next steps to take.

I also share practical experience creating small tools with vibe coding to reduce repetitive tasks, then validating and improving the results.

More

Reviews

Not enough reviews.
Please write a valuable review that helps everyone!

Kihong's other courses

Check out other courses by the instructor!

Limited time deal ends in 6 days

$53.90

30%

$77.00