ProDeveloperTutorial.com

Tutorials and Programming Solutions
Menu
  • Shell Scripting
  • System Design
  • Linux System Programming
  • 4g LTE
  • Coding questions
  • C
  • C++
  • DSA
  • GIT
  • 450 DSA Cracker
  • 5G NR
  • O-RAN

5G Identities in detail Part 2

prodevelopertutorial September 10, 2022

In this chapter we shall learn about:

1. 5G GUTI – 5G Globally Temporary Identifier
2. 5G S TMSI – It is a shorter version of 5G GUTI. 5G S Temporary Mobile Subscriber Identity

5G GUTI:

5G GUTI is a Core Network Temporary identifier assigned by AMF to UE during initial registration.

Below are few points on 5G GUTI:

1. It is 80 bits long consists of PLMN + AMF ID + TMSI

2. AMF can re-assign new 5G-GUTI to the UE at any time under specific conditions.

3. Single 5G-GUTIcan be used for accessing 3GPP and non-3GPP technologies within the AMF.

5G GUTI Structure

5G Identities in detail Part 2

Let us understand above image.

5G GUTI = GUAMI + 5G-TMSI

GUAMI = MCC + MNC + AMFI

AMFI = AMF Region ID + AMF Set ID + AMF Pointer

5G-S-TMSI = AMF Set ID + AMF Pointer + 5G-TMSI

If there are multiple AMF in the region [AMF Region ID], then they are supported by AMF Set ID and AMF pointer. So by this operators can re-use the same AMF set ID and AMF pointers in different regions.

When AMF will provide a new 5G-GUTI

1. When it receives Registration Request message of type “initial registration” or “mobility registration update” from a UE, then AMF will assign a new 5G-GUTI.

2. Registration Request for “periodic registration update” from UE. Then AMF will send a new 5G-GUTI.

3. When UE sends “Service Request message” as a response to “Paging Message”, then AMF shall assign a new 5G-GUTI.

Mapping of 5G GUTI and 4G GUTI
5G Identities in detail Part 2

As 5G needs to work with 4G networks also, above is the mapping of 5G GUTI with 4G GUTI.

When a user moves from 5G area to 4G area, then the UE will map 5G GUTI to 4G GUTI and forwards to MME.
MME will perform a mapping of 4G GUTI to 5G GUTI to check from where the MME needs to contact to fetch the UE context.

When a user moves from 4G area to 5G area, then UE maps 4G GUTI to 5G GUTI and sends to AMF.
Then AMF will decode the MME ID to get the user context.

For more detailed information, visit TS 23 003, 23 501

Share
Email
Tweet
Linkedin
Reddit
Stumble
Pinterest
Prev Article
Next Article

About The Author

prodevelopertutorial

Follow this blog to learn more about C, C++, Linux, Competitive Programming concepts, Data Structures.

Leave a Reply Cancel Reply

You must be logged in to post a comment.

ProDeveloperTutorial.com

Tutorials and Programming Solutions
Copyright © 2023 ProDeveloperTutorial.com
We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept”, you consent to the use of ALL the cookies.
Do not sell my personal information.
Cookie SettingsAccept
Manage consent

Privacy Overview

This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary
Always Enabled
Necessary cookies are absolutely essential for the website to function properly. These cookies ensure basic functionalities and security features of the website, anonymously.
CookieDurationDescription
cookielawinfo-checkbox-analytics11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics".
cookielawinfo-checkbox-functional11 monthsThe cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
cookielawinfo-checkbox-necessary11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
cookielawinfo-checkbox-others11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other.
cookielawinfo-checkbox-performance11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance".
viewed_cookie_policy11 monthsThe cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data.
Functional
Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features.
Performance
Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors.
Analytics
Analytical cookies are used to understand how visitors interact with the website. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc.
Advertisement
Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. These cookies track visitors across websites and collect information to provide customized ads.
Others
Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet.
SAVE & ACCEPT