Terminal MAC Reset for System Information Acquisition

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Solution Overview

Problem

In the 5G NR system, terminals performing cell reselection during an SI request procedure continue to waste energy overheads of the original base station as they maintain the SI request procedure, leading to inefficient resource utilization.

Innovation Solution

A method and device that allow terminals to reset the MAC layer or RACH procedure parameters upon cell reselection, enabling the termination of the current SI request and reinitiation in the new cell, thus avoiding interference and conserving base station energy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminal continues the SI request procedure after cell reselection, then the terminal can acquire system information in the original cell, but the base station energy overheads are wasted

Engineering Contradiction:

Improvesystem information acquisitionVSAvoidbase station energy overheads

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent applies dynamics by making the SI request procedure state-dependent. The terminal determines whether to continue or reset the RACH procedure based on the current cell state and reselection status. This dynamic adjustment allows the system to adapt to changing conditions (cell reselection) and terminate unnecessary procedures, thereby reducing base station energy overheads while ensuring reliable SI acquisition in the appropriate cell context

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the state parameter of the RACH procedure based on cell reselection events. When a terminal performs cell reselection, the system parameter (procedure state) is modified to reset the RACH procedure, preventing continuation in the original cell. This parameter change ensures that SI request procedures are actively managed according to terminal location, eliminating wasted energy overheads while maintaining acquisition reliability

Inventive Principle:

Principle #35Parameter changes

2Loss of energy

If the terminal resets the MAC layer or RACH procedure parameters upon cell reselection, then the base station energy is conserved, but the terminal must reinitiate the SI request procedure

Engineering Contradiction:

Improvebase station energy overheadsVSAvoidSI request procedure reinitiation time

Core Design Contradiction:

Loss of energyVSLoss of time

Solution Approach 1:

The patent implements periodic action through the structured handling of SI request procedures. The terminal periodically checks cell reselection status and accordingly periodically resets or continues the RACH procedure. This periodic management ensures that procedures are actively maintained only when necessary, balancing energy conservation with minimal reinitiation time through systematic state monitoring and transition

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS11825365B2Method and device for requesting system information, storage medium, and terminal

Publication Date: 2023.11.21 ZTE CORP

AI summary

Provided are a method and device for requesting system information, a storage medium and a terminal. The method includes that: a terminal performs a cell reselection in the case where the terminal initiates a system information request procedure but has not successfully completed the system information request procedure, the terminal resets an MAC layer or a relevant parameter of an RACH procedure, and the terminal acquires required SI according to an RRC configuration of a reselected cell. When the terminal initiates the system information request procedure, the terminal may immediately reset the MAC layer or the relevant parameter of the RACH procedure after triggering the cell reselection, so as to terminate the current system information request procedure, and acquire the required SI again in the reselected cell.