Handover Failure Management in DRX Mode

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Solution Overview

Problem

Cellular networks face challenges in minimizing handover failures, particularly in discontinuous reception (DRX) mode, where inaccurate measurements can lead to late or unsuccessful handovers, causing service discontinuity and increased power consumption.

Innovation Solution

An apparatus and method that determine handover failures, compile information on DRX mode, and adjust handover parameters based on failure reports and motion patterns to predict and facilitate timely handovers, reducing the occurrence of defective handovers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the mobile device operates in discontinuous reception (DRX) mode to minimize power consumption, then power consumption is reduced, but handover measurements become inaccurate or delayed

Engineering Contradiction:

Improvepower consumptionVSAvoidhandover measurement accuracy

Core Design Contradiction:

Use of energy by moving objectVSMeasurement precision

Solution Approach 1:

The network performs preliminary actions by collecting movement information and deriving motion patterns before handover failures occur. The system proactively identifies devices likely to experience handover failures based on their movement patterns and DRX configuration, allowing the network to prepare appropriate handover parameters in advance rather than reacting after failures occur.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback mechanisms where mobile devices report handover failure information to the network. The network uses this feedback along with movement information and motion patterns to adjust handover parameters dynamically, creating a closed-loop system that continuously improves handover success rates based on actual performance data.

Inventive Principle:

Principle #23Feedback

2Reliability

If handover parameters are adjusted frequently to improve handover success rates, then handover reliability improves, but network complexity increases

Engineering Contradiction:

Improvehandover success rateVSAvoidnetwork management complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system changes handover parameters dynamically based on collected failure information and motion patterns. The network adjusts parameters such as handover timing, measurement reporting intervals, and DRX configuration to optimize handover success rates for specific devices or device types, transforming static parameters into adaptive values that respond to real-time conditions.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9532241B2Method and apparatus for managing handover failure

Publication Date: 2016.12.27 NOKIA TECHNOLOGIES OY

AI summary

In accordance with an example embodiment of the present invention, there is provided an apparatus comprising at least one processing core configured to determine a handover failure at the apparatus, the at least one processing core being further configured to compile information relating to the handover failure, the information comprising information on discontinuous reception, DRX, at the apparatus, the at least one processing core being further configured to cause a transmitter comprised in the apparatus to transmit the information relating to the handover failure toward a radio-access network. The information may be comprised in a handover failure report.