Conditional Mobility Switching for 5G Radio Link Failure Reduction

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Solution Overview

Problem

In 5G wireless communication systems, the existing handover mechanisms face challenges in ensuring seamless mobility and minimizing radio link failures due to the need for improved handover strategies in dense deployments with advanced beam-forming capabilities, particularly in scenarios where the target cell quality may not meet the minimum requirements for conditional handover.

Innovation Solution

A method for a wireless device to autonomously switch to a target cell upon detecting a serving cell problem, where the target cell may not initially meet the quality conditions, by relaxing the mobility criteria and performing a conditional handover based on cell selection criteria, thereby ensuring continuous data transmission without interruption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conditional handover is performed based on strict quality conditions, then handover reliability is improved, but mobility responsiveness deteriorates when serving cell quality degrades rapidly

Engineering Contradiction:

Improvehandover reliabilityVSAvoidmobility responsiveness

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The patent implements dynamic handover triggering by allowing the wireless device to switch from condition-based handover to problem-based handover. When a serving cell problem is detected, the device can immediately trigger handover to a pre-configured target cell without waiting for quality conditions to be met, thus adapting the handover strategy to the current radio situation and improving responsiveness while maintaining reliability

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent configures multiple candidate target cells in advance with their respective handover conditions. When a serving cell problem occurs, the device can immediately select from the pre-configured candidates without needing to search for new targets, reducing handover latency. The preliminary configuration includes cell selection criteria and quality thresholds that can be quickly evaluated

Inventive Principle:

Principle #10Preliminary action

2Stability of the object's composition

If the wireless device waits for target cell quality to meet minimum requirements, then connection stability is improved, but handover timing is delayed causing potential service interruption

Engineering Contradiction:

Improveconnection stabilityVSAvoidhandover timing delay

Core Design Contradiction:

Stability of the object's compositionVSLoss of time

Solution Approach 1:

The patent prepares multiple candidate target cells with different quality thresholds and handover conditions in advance. When serving cell quality degrades or a problem is detected, the device can immediately select from these pre-prepared candidates, cushioning against the delay that would otherwise occur while searching for and evaluating new target cells. This ensures continuous service without interruption

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The patent allows dynamic adjustment of handover triggering parameters based on serving cell condition. When a serving cell problem is detected, the device can change from evaluating strict quality conditions to evaluating cell selection criteria (S-criterion), which has lower thresholds. This parameter change enables faster handover initiation while maintaining connection stability through the pre-configured target cell selection process

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If the wireless device performs cell selection based on relaxed criteria, then mobility flexibility is improved, but risk of selecting suboptimal target cell increases

Engineering Contradiction:

Improvemobility flexibilityVSAvoidtarget cell selection quality

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the handover target cell selection into multiple candidate cells, each with different quality thresholds and handover conditions. When a serving cell problem occurs, the device evaluates multiple candidates against cell selection criteria and selects the best match. This segmentation allows flexibility in selection while maintaining reliability through systematic evaluation of multiple options rather than relying on a single target

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements feedback mechanisms where the wireless device monitors serving cell quality and detects problems, then uses this feedback to trigger appropriate handover actions. The device continuously evaluates candidate target cells based on current radio conditions and selects the most suitable target, ensuring that even with relaxed selection criteria, the chosen target is appropriate for the current situation

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12004029B2Mobility condition change based on serving cell quality and connection release

Publication Date: 2024.06.04 LG ELECTRONICS INC

AI summary

A method and apparatus for mobility condition change based on serving cell quality and connection release in a wireless communication system is provided. A wireless device receives information on a first condition related to a conditional mobility to a target cell, detects a serving cell problem, performs the conditional mobility to the target cell based on a second condition related to a cell selection, and performs a connection release with the target cell.