UE MDT Measurement Logging During Handover

Solution Overview

Problem

In wireless communication systems, particularly in 3GPP LTE, user equipment (UE) often unnecessarily transmits minimization of drive tests (MDT) measurement results to cells that do not support MDT during handover, leading to inefficiencies and resource wastage.

Innovation Solution

A user equipment (UE) configured to receive a handover command from one cell to another, stops transmitting the MDT measurement response if the target cell does not support MDT, ensuring that measurement results are only reported to cells capable of processing them, and logs measurements in RRC idle mode for efficient reporting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE continuously transmits MDT measurement results during handover, then the measurement coverage is improved, but the network resources are wasted when the target cell does not support MDT

Engineering Contradiction:

Improvemeasurement coverageVSAvoidnetwork resources

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The UE performs preliminary actions by storing MDT measurement results in local memory before handover occurs. When handover command is received, the UE checks whether the target cell supports MDT before transmitting the stored measurement results, thereby avoiding unnecessary transmission to cells that cannot process the data.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces an intermediary mechanism where the UE acts as a mediator between the source cell and target cell during handover. The UE temporarily stores measurement results and uses the handover command as a trigger to determine whether transmission is appropriate, effectively mediating the decision-making process.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Loss of energy

If the UE stops transmitting MDT results during handover, then network resources are saved, but the measurement data may be lost

Engineering Contradiction:

Improvenetwork resourcesVSAvoidmeasurement data

Core Design Contradiction:

Loss of energyVSLoss of information

Solution Approach 1:

The UE performs preliminary actions by storing MDT measurement results in local memory before handover occurs. When handover command is received, the UE checks whether the target cell supports MDT before transmitting the stored measurement results, thereby avoiding unnecessary transmission to cells that cannot process the data.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces an intermediary mechanism where the UE acts as a mediator between the source cell and target cell during handover. The UE temporarily stores measurement results and uses the handover command as a trigger to determine whether transmission is appropriate, effectively mediating the decision-making process.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If the UE logs measurements in RRC idle mode, then the measurement logging is optimized, but the complexity of measurement management increases

Engineering Contradiction:

Improvemeasurement logging efficiencyVSAvoidmeasurement management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies self-service by enabling the UE to autonomously perform measurement logging in RRC idle mode without continuous network intervention. The UE automatically manages measurement data storage and transmission decisions based on local conditions, reducing the need for complex network-controlled measurement management.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS8306538B2Apparatus and method of performing measurements logging in wireless communication system

Publication Date: 2012.11.06 LG ELECTRONICS INC

AI summary

A method and apparatus of performing measurements logging in a mobile communications system is provided. A user equipment receives a first measurement request message from a first cell and receives a handover command message. Upon receiving the handover command message, the user equipment stops a transmission of a response to the first measurement request message.