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 NR RRC States

prodevelopertutorial September 10, 2022

In this chapter we shall have a look at the functionalities of different RRC States.

There are 3 RRC states in 5G NR.

1. RRC Connected
2. RRC Inactive
3. RRC Idle

5G NR RRC States

UE will be in RRC_Idle mode when it first camps on 5G cell.

This can be when a device is switched-on. UE will move to RRC Connected when it completes RRC Setup procedure.

When UE in connected mode, SRB will be configured along with one or more DRB.

UE in connected mode, it will register to the network and move from RM-Deregistered to RM-Registered. Registration procedure allows the UE to allocate 5G-S-TMSI.

After that UE will move from CM-IDLE to CM-Connected.

UE will move from RRC Connected to RRC Inactive using RRC Release procedure, “spendConfig” IE will be included within the RRC Release to indicate that the UE is moving to RRC Release instead of RRC Inactive.

UE will move to RRC Idle by completing RRC Connection Release procedure. This will release all the allocated C-RNTI, radio bearers and all radio resources.

 

RRC Connected State:

1. Initially UE will be in RRC Idle mode and it will move from RRC Idle to RRC Connected state by completing RRC Setup Procedure.

2. In this state UE will be allocated C-RNTI. One C-RNTI will be allocated if it is connected to single BS, 2 C-RNTI will be allocated with UE is connected to Multi-RAT Dual Connectivity.

  • CRNTI will be used to address the UE.

3. UE will be in CM-Connected mode.

4. UE stores access stratum context.

5. AMF will have NG signalling connection with BS.

6. UPF will have GTP-U tunnels with BS.

7. Transfer of Uplink and Downlink data.

8. Configuration of Connected Mode DRX.

9. UE will monitor PDCCH DCI using P-RNTI.

10. In this state, UE will transfer both application data and signalling between UE and Network.

RRC Inactive State:

1. UE will move from RRC Connected to RRC Inactive by sending RRC Release Procedure.

2. “suspendConfig” IE is used to indicate that RRC is moving to RRC Inactive instead of RRC Idle state.

3. suspendConfig IE will provide with a Inactive-RNTI to a UE. This is. used to address the UE within RRC paging messages.

4. UE will be moved to RRC Inactive state to reduce the signalling load.

5. UE will be in CM-Connected mode.

6. UE will have access stratum context.

7. UE will do RNA update.

8. UE will apply DRX for paging.

9. UE monitors PDCCH DCI using P-RNTI.

RRC Idle

1. UE will move to RRC Idle by completing the RRC Connection Release Procedure.

2. UE will release C-RNTI along with all radio bearers and radio resources.

3. UE will be in CM-IDLE state.

4. UE will read system information for RRC Setup.

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