SIB1 Barring Timer Pause for Cell Acquisition

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficient cell acquisition and handling of SIB1 decode timeout failures, leading to potential service disruptions and reduced network performance.

Innovation Solution

A method where user equipment (UE) in standalone (SA) mode initiates a timer for barring a first cell due to SIB1 decode timeout failure, then switches to non-standalone (NSA) mode, pauses the timer upon receiving a redirection instruction, and performs an initial acquisition procedure on the first cell before the timer expires.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE starts a timer to bar a cell due to SIB1 decode timeout failure, then the reliability of cell selection is improved, but the loss of time for cell acquisition increases

Engineering Contradiction:

Improvecell selection reliabilityVSAvoidcell acquisition time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The UE performs NSA mode connection and measurement procedures before the barring timer expires, preparing for potential SA mode transition. This preliminary action allows the UE to maintain service continuity while preserving the option to acquire the barred cell if conditions improve, thus reducing overall cell acquisition time without compromising selection reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The UE dynamically adjusts its cell acquisition strategy by pausing the barring timer when NSA mode measurement results indicate the barred cell is suitable for connection. This dynamic approach allows the UE to adapt to changing radio conditions, potentially acquiring the cell earlier than the original timer would allow, thereby reducing cell acquisition time while maintaining reliable selection criteria

Inventive Principle:

Principle #15Dynamics

2Productivity

If the UE performs initial ACQ procedure on a barred cell before timer expiration, then the productivity of cell acquisition is improved, but the reliability of cell selection may deteriorate

Engineering Contradiction:

Improvecell acquisition efficiencyVSAvoidcell selection reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The UE performs preliminary NSA mode measurements and evaluations on the barred cell before attempting SA mode acquisition. This preliminary action provides advance information about cell suitability, allowing the UE to make informed decisions about whether to proceed with ACQ procedure, thus improving acquisition efficiency while maintaining selection reliability through pre-validated criteria

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The UE uses measurement results from NSA mode as feedback to determine whether to pause the barring timer and perform SA mode ACQ procedure. This feedback mechanism ensures that productivity improvements are achieved only when the cell meets suitability criteria, preventing unreliable cell selections while enhancing acquisition efficiency

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12279161B2Connection management on SIB1 based barred cell

Publication Date: 2025.04.15 QUALCOMM INC

AI summary

A user equipment (UE) may be in a standalone (SA) mode and start a timer associated with barring a first cell, based on a system information block type 1 (SIB 1) decode timeout failure. The UE may receive, from a base station, a first redirection instruction to connect to the first cell in a non-standalone (NSA) mode. The UE in the NSA mode may determine that the measurement for the first cell is greater than a threshold value, and receive, from the base station a second redirection instruction to switch to the SA mode on the first cell. The UE may pause the timer and perform an initial acquisition procedure on the first cell.