Mobile IAB Cell Detection via SSB Scanning and PCI Filtering

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Solution Overview

Problem

In urban environments, UEs face challenges in efficiently searching for Mobile IAB and CAG cells for cell reselection prioritization due to the complexity of existing technologies and the need to balance dedicated frequency priorities with the ability to prioritize Mobile IAB+CAG cells.

Innovation Solution

The proposed solution involves an apparatus and method that determine the list of ranges in a communication network where Closed Access Group (CAG) and Mobile Integrated Access and Backhaul (IAB) cells can be found. The apparatus scans synchronization signal blocks for physical cell identifiers of candidate cells within these lists, decodes system information to verify the candidate cells as both CAG and IAB cells, and enables access for cell reselection, potentially ignoring dedicated frequency priorities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If UEs search all cells for Mobile IAB and CAG cells, then cell reselection coverage is complete, but power consumption increases and search efficiency decreases

Engineering Contradiction:

Improvecell reselection efficiencyVSAvoidUE power consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent segments the cell search process into two phases: first identifying candidate cells using reduced criteria (SSB detection with PCI filtering), then performing detailed verification only on segmented candidate sets. This divides the exhaustive search into manageable stages, reducing overall power consumption while maintaining completeness.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent performs preliminary cell identification actions by detecting SSBs and filtering candidate cells based on PCI ranges before conducting full system information decoding. This preliminary filtering action reduces the number of cells requiring complete verification, thereby reducing power consumption while ensuring no valid cells are missed.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If UEs prioritize Mobile IAB+CAG cells by ignoring dedicated frequency priorities, then access efficiency to relay cells improves, but compliance with network frequency management policies deteriorates

Engineering Contradiction:

Improveaccess efficiency to Mobile IAB+CAG cellsVSAvoidcompliance with frequency priority policies

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements dynamic priority adjustment where the UE adapts its cell reselection priorities based on real-time detection of Mobile IAB+CAG cell characteristics. The system dynamically switches between respecting dedicated frequency priorities and prioritizing Mobile IAB+CAG cells based on service requirements and network conditions, resolving the contradiction through adaptive behavior.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the priority parameter for cell reselection based on cell type identification. When Mobile IAB+CAG cells are detected, the system modifies reselection parameters to prioritize these cells while maintaining compliance through controlled parameter adjustment rather than ignoring policies entirely.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If UEs decode system information for all candidate cells, then verification accuracy is high, but processing time and power consumption increase

Engineering Contradiction:

Improvecell verification accuracyVSAvoidcell search and verification time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent extracts and utilizes specific identifying features (PCI ranges, SSB characteristics) from candidate cells to create a filtered shortlist before performing complete system information decoding. This extraction of key identifying parameters allows accurate candidate selection without time-consuming full verification of all cells.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies partial verification action by performing initial filtering based on SSB and PCI criteria, then applying full system information decoding only to the reduced candidate set. This partial action approach achieves sufficient verification accuracy for the subset of relevant cells without the excessive time cost of verifying all cells.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12342232B2Method to detect and prioritize closed access group mobile IAB cells

Publication Date: 2025.06.24 NOKIA TECHNOLOGIES OY

AI summary

In accordance with example embodiments of the invention there is at least a method and apparatus to perform determining by an apparatus information of a list of ranges in a communication network where at least one closed access group cell may be found and where at least one mobile integrated access and backhaul cell may be found; scanning synchronization signal blocks for physical cell identifiers of a candidate cell that are found in both at least one system information block closed access group list or range and at least one system information block mobile integrated access and backhaul list or range; based on the scanning, decoding system information at the candidate cell to verify that the candidate cell is a mobile integrated access and backhaul cell and a closed access group cell; and based on the decoding, enable the apparatus to access the candidate cell for cell reselection.