RedCap NR Cell Reselection Using Selective System Information

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Solution Overview

Problem

Existing mobile communication systems face challenges in efficiently supporting terminals with reduced capability (RedCap UEs) due to their limited performance, particularly in accessing and operating within New Radio (NR) cells, which require specialized methods for system information acquisition and cell reselection.

Innovation Solution

A method and apparatus for RedCap UEs to receive Master Information Block (MIB) and System Information Block1 (SIB1) from a base station, determine cell barring, and perform specific operation groups based on the received information, utilizing search space 0 (SS #0) and control resource set 0 (CORESET #0) in the initial bandwidth part (IBWP) to access and operate within NR cells.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If RedCap UEs use standard NR cell access procedures, then compatibility with existing systems is maintained, but power consumption and access complexity increase beyond RedCap capabilities

Engineering Contradiction:

ImprovecompatibilityVSAvoidpower consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent modifies cell reselection parameters specifically for RedCap UEs by introducing a new parameter 'qOffsetRangeRedCap' that adjusts the Qoffset value based on RedCap capabilities. This parameter change enables tailored cell reselection behavior that reduces power consumption while maintaining network compatibility.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the cell reselection process into distinct handling for RedCap UEs versus regular UEs. By creating separate parameter sets and evaluation criteria specifically for RedCap devices, the system optimizes power consumption for this segment without affecting overall network operations.

Inventive Principle:

Principle #1Segmentation

2Loss of information

If RedCap UEs monitor all system information blocks, then complete system information is acquired, but processing complexity and power consumption increase

Engineering Contradiction:

Improvesystem information acquisitionVSAvoidprocessing complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The patent extracts only the essential system information that RedCap UEs need for cell reselection, specifically focusing on SIB2 and SIB4 containing intra-frequency and inter-frequency cell reselection parameters. This extraction approach eliminates unnecessary processing of redundant information while ensuring all critical data is acquired.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent implements partial monitoring of system information blocks by selectively acquiring only those SIBs relevant to RedCap cell reselection operations. This partial action approach reduces processing complexity while maintaining sufficient information for effective cell reselection.

Inventive Principle:

Principle #16Partial or excessive action

3Measurement precision

If RedCap UEs perform frequent cell reselection measurements, then cell reselection accuracy improves, but power consumption and measurement overhead increase

Engineering Contradiction:

Improvecell reselection accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic cell reselection measurements with optimized intervals tailored for RedCap UEs. By establishing regular measurement cycles rather than continuous monitoring, the system maintains cell reselection accuracy while significantly reducing power consumption compared to frequent or continuous measurements.

Inventive Principle:

Principle #19Periodic action

4Use of energy by moving object

If RedCap UEs operate in limited bandwidth, then power consumption is reduced, but system information acquisition time and reliability may be affected

Engineering Contradiction:

Improvepower consumptionVSAvoidsystem information acquisition time

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-configuring RedCap UEs with essential cell reselection parameters and search space information before actual cell reselection operations. This preliminary provision of critical data reduces the time required for system information acquisition during operation while maintaining low bandwidth and power consumption.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12556982B2Method and apparatus for reduced capability terminal to determine intra-frequency cell reselection parameter for cell reselection in mobile wireless communication system

Publication Date: 2026.02.17 BLACKPIN INC

AI summary

A method and apparatus for accessing a NR cell in a mobile communication system are provided. Method for accessing a NR cell includes receiving in a first cell, by a terminal from a base station, a Master Information Block (MIB) and a System Information Block1 (SIB1), determining, by the terminal, if the first cell is barred and performing by the terminal either a first operation group or a second operation group if the cell is barred and perform, if the first cell is not barred, a third operation group.