UE Handover Early Source Radio Connection Release

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Solution Overview

Problem

Existing handover solutions in wireless communication networks, such as Make-Before-Break (MBB) in LTE Release 14, require the UE to maintain the source radio connection longer than necessary, leading to higher radio resource usage, memory, processor, and power consumption.

Innovation Solution

A User Equipment (UE) method that allows for early release of the source radio connection when specific criteria are met, such as receiving a valid data packet from the target access node or detecting a radio link failure, thereby optimizing handover performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE maintains the source radio connection longer to ensure reliable handover execution, then handover reliability is improved, but radio resource usage, memory consumption, processor consumption, and power consumption increase

Engineering Contradiction:
Improvehandover reliabilityVSAvoidpower consumption
Core Design Contradiction:
ReliabilityVSUse of energy by moving object

Solution Approach 1:

The network node provides the release condition criterion to the UE before handover execution, enabling the UE to proactively determine when to release the source radio connection based on pre-defined conditions rather than maintaining it indefinitely or waiting for network release commands

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The UE continuously monitors handover execution status and compares it against the provided release condition criterion, creating a feedback mechanism that automatically triggers source radio connection release when conditions are met, thereby optimizing resource usage while ensuring reliable handover completion

Inventive Principle:
Principle #23Feedback

2Reliability

If the UE maintains the source radio connection longer to ensure reliable handover execution, then handover reliability is improved, but radio resource usage increases

Engineering Contradiction:
Improvehandover reliabilityVSAvoidradio resource usage
Core Design Contradiction:
ReliabilityVSQuantity of substance

Solution Approach 1:

The network node provides the release condition criterion to the UE before handover execution, enabling the UE to proactively determine when to release the source radio connection based on pre-defined conditions rather than maintaining it indefinitely or waiting for network release commands

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The UE continuously monitors handover execution status and compares it against the provided release condition criterion, creating a feedback mechanism that automatically triggers source radio connection release when conditions are met, thereby optimizing resource usage while ensuring reliable handover completion

Inventive Principle:
Principle #23Feedback

3Reliability

If the UE maintains the source radio connection longer to ensure reliable handover execution, then handover reliability is improved, but processor consumption increases

Engineering Contradiction:
Improvehandover reliabilityVSAvoidprocessor consumption
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The network node provides the release condition criterion to the UE before handover execution, enabling the UE to proactively determine when to release the source radio connection based on pre-defined conditions rather than maintaining it indefinitely or waiting for network release commands

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The UE continuously monitors handover execution status and compares it against the provided release condition criterion, creating a feedback mechanism that automatically triggers source radio connection release when conditions are met, thereby optimizing resource usage while ensuring reliable handover completion

Inventive Principle:
Principle #23Feedback

4Reliability

If the UE maintains the source radio connection longer to ensure reliable handover execution, then handover reliability is improved, but memory consumption increases

Engineering Contradiction:
Improvehandover reliabilityVSAvoidmemory consumption
Core Design Contradiction:
ReliabilityVSQuantity of substance

Solution Approach 1:

The network node provides the release condition criterion to the UE before handover execution, enabling the UE to proactively determine when to release the source radio connection based on pre-defined conditions rather than maintaining it indefinitely or waiting for network release commands

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The UE continuously monitors handover execution status and compares it against the provided release condition criterion, creating a feedback mechanism that automatically triggers source radio connection release when conditions are met, thereby optimizing resource usage while ensuring reliable handover completion

Inventive Principle:
Principle #23Feedback

5Use of energy by moving object

If the UE releases the source radio connection earlier to optimize resource usage, then power consumption is reduced, but handover reliability may deteriorate

Engineering Contradiction:
Improvepower consumptionVSAvoidhandover reliability
Core Design Contradiction:
Use of energy by moving objectVSReliability

Solution Approach 1:

The network node provides the release condition criterion to the UE before handover execution, enabling the UE to proactively determine when to release the source radio connection based on pre-defined conditions rather than maintaining it indefinitely or waiting for network release commands

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The UE continuously monitors handover execution status and compares it against the provided release condition criterion, creating a feedback mechanism that automatically triggers source radio connection release when conditions are met, thereby optimizing resource usage while ensuring reliable handover completion

Inventive Principle:
Principle #23Feedback

6Quantity of substance

If the UE releases the source radio connection earlier to optimize resource usage, then radio resource usage is reduced, but handover reliability may deteriorate

Engineering Contradiction:
Improveradio resource usageVSAvoidhandover reliability
Core Design Contradiction:
Quantity of substanceVSReliability

Solution Approach 1:

The network node provides the release condition criterion to the UE before handover execution, enabling the UE to proactively determine when to release the source radio connection based on pre-defined conditions rather than maintaining it indefinitely or waiting for network release commands

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The UE continuously monitors handover execution status and compares it against the provided release condition criterion, creating a feedback mechanism that automatically triggers source radio connection release when conditions are met, thereby optimizing resource usage while ensuring reliable handover completion

Inventive Principle:
Principle #23Feedback

Data Source

PatentUS12063554B2User equipment and methods therein for performing handover
Publication Date: 2024.08.13 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
  • US12063554B2 patent drawing
  • US12063554B2 patent drawing
  • US12063554B2 patent drawing

AI summary

A method performed by a User Equipment, UE, to perform handover from a source access node to a target access node is provided. The UE, the source access node and 5 the target access node are operating in a wireless communications network. The UE receives (601) a handover command message from the source access node. The UE establishes (602) a target radio connection with the target access node, and determines (603) whether or not a source cell release criterion is fulfilled. When the source cell release criterion is determined to be fulfilled, the UE releases (604) a source radio 10 connection with the source access node.