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 PDCCH order

prodevelopertutorial September 10, 2022

PDCCH Order will be initiated by network to trigger a Random Access procedure.

This is initiated when there is an upstream loss.

When gNB has downstream data to send, PDCCH order will be used to initiate RACH and get up-stream synchronization.

PDCCH order uses PDCCH DCI 1_0 on SSB index UE is camped along with PRACH preamble and RACH occasion to configure the UE.

PDCCH order will be triggered by the network, if the network detects there is a DL data to be sent but there is an issue with UL synchronization because of Time Alignment timer expiry.

If there is on-going random access procedure that is triggered by PDCCH, and UE receives another PDCCH order with the same Random Access Preamble, PRACH mask index, and uplink carrier, then it is considered as the same and will not be initialized again.

PDCCH Order in 5G NR

5G NR PDCCH order

When the UE in RRC_CONNECTED mode, and network detects that UE goes out of sync.

Network sends PDCCH order DCI 1_0 to UE with dedicated RACH preamble.

DCI Format 1_0 contains C-RNTI CRC scrambled, containing SSB index, ra-PreambleIndex and PRACH Mask Index

UE triggers RACH procedure and completes RACH procedure.

Then RRCConnectionReconfiguration message will be sent to UE.

DCI Format 1_0 will be used for PDCCH order

DCI format 1_0 is used for allocating downlink resources for PDSCH.

DCI format 1_0 with CRC scrambled by C-RNTI for PDCCH order:

5G NR PDCCH order

When UE decodes the DCI format 1_0 with CRC scrambled by C-RNTI and the “Frequency domain resource assignment” are all 1s, then the random access procedure initiated by PDCCH order.

 

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