WTRU Conditional Reconfiguration for 5G Handover Reliability

Solution Overview

Problem

In 5G wireless systems, there is a challenge in ensuring reliable and flexible mobility during handovers, handoffs, or cell changes due to sporadic, infrequent, bursty, and unpredictable traffic patterns, which can lead to handover failures or radio link failures, especially at high frequencies where beamformed links are susceptible to obstructions.

Innovation Solution

A wireless transmit/receive unit (WTRU) is configured to store and apply a reconfiguration message with delay based on trigger conditions, allowing for timely corrective actions during handovers or cell changes, thereby reducing the time between impairment detection and corrective action, and improving the reliability of control signaling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional handover procedures are used in 5G systems, then mobility management is maintained, but handover failures or radio link failures occur due to sporadic and unpredictable traffic patterns

Engineering Contradiction:

Improvehandover reliabilityVSAvoidmobility management efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies preliminary action by pre-configuring reconfiguration messages with trigger conditions before actual handover events occur. The WTRU stores these pre-configured messages and monitors for trigger conditions to be satisfied, enabling timely corrective actions without delay when impairment events are detected, thus improving handover reliability while maintaining mobility management efficiency

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback mechanisms where the WTRU monitors trigger conditions based on impairment events and executes corrective actions accordingly. This feedback loop ensures that handover decisions are data-driven and responsive to actual network conditions, reducing handover failures while optimizing mobility management performance

Inventive Principle:

Principle #23Feedback

2Speed

If reconfiguration messages are applied immediately, then responsiveness is improved, but processing delay and reliability are reduced due to trigger condition monitoring requirements

Engineering Contradiction:

Improvereaction timeVSAvoidhandover reliability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-configuring reconfiguration messages with trigger conditions before actual handover events occur. The WTRU stores these pre-configured messages and monitors for trigger conditions to be satisfied, enabling timely corrective actions without delay when impairment events are detected, thus improving handover reliability while maintaining mobility management efficiency

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback mechanisms where the WTRU monitors trigger conditions based on impairment events and executes corrective actions accordingly. This feedback loop ensures that handover decisions are data-driven and responsive to actual network conditions, reducing handover failures while optimizing mobility management performance

Inventive Principle:

Principle #23Feedback

3Reliability

If frequent reference signals are transmitted, then handover reliability is improved, but power consumption increases

Engineering Contradiction:

Improvehandover reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies periodic action by enabling sparse transmission of reference signals rather than continuous transmission. The WTRU transmits reference signals at optimized intervals based on trigger condition monitoring and impairment event detection, maintaining handover reliability while significantly reducing power consumption through periodic rather than continuous operation

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent implements self-service mechanisms where the WTRU autonomously monitors trigger conditions and determines when reference signal transmission is necessary. This autonomous decision-making enables the system to transmit reference signals only when needed based on actual network conditions, reducing unnecessary power consumption while maintaining handover reliability

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20240365186A1Mobility operations based on layer 1 trigger conditions

Publication Date: 2024.10.31 INTERDIGITAL PATENT HOLDINGS INC

AI summary

Methods for mobility operations based on lower-layer trigger conditions are provided herein. A method performed by a wireless transmit/receive unit (WTRU) may include receiving a configuration message from a network node associated with a serving cell. The message indicates a conditional reconfiguration which, when executed by the WTRU, causes the WTRU to perform a handover to a target cell for performing handover to a target cell. The message indicates a trigger condition which, when met, causes the WTRU to execute the conditional reconfiguration. The method may include sending a measurement report including one or more measurements associated with the target cell, receiving a message from the network node, and immediately executing the conditional reconfiguration and performing the handover to the target cell.