Coexistent Interference Frequency Set Configuration for LTE-A Handover

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Solution Overview

Problem

Current methods for configuring coexistent interference frequency sets in LTE-A networks result in redundant reconfiguration when a UE is handed over from one base station to another, leading to waste of system resources and decreased performance due to identical frequency sets between source and target base stations.

Innovation Solution

A method where the target base station compares the coexistent interference frequency set transmitted by the source base station with a preset set and only reconfigures if they are not identical, allowing the UE to continue using the original frequency set for interference evaluation, thereby reducing unnecessary reconfiguration and resource waste.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the target base station reconfigures a coexistent interference frequency set for UE during handover, then the UE can evaluate interference frequencies accurately, but the configuration overhead increases and system resources are wasted when the frequency set is identical to the source base station's set

Engineering Contradiction:

Improveinterference evaluation accuracyVSAvoidconfiguration overhead

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The source base station pre-configures the coexistent interference frequency set for the UE before handover. The target base station then compares this pre-configured set with its own preset frequency set and only reconfigures if they differ, avoiding redundant configuration actions.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The target base station compares the source base station's frequency set with its own preset set and makes a decision based on this comparison feedback. If the sets are identical, no reconfiguration is performed; if they differ, reconfiguration is executed.

Inventive Principle:

Principle #23Feedback

2Reliability

If the target base station reconfigures a coexistent interference frequency set for UE during handover, then the UE maintains accurate interference evaluation, but the handover process complexity increases due to additional comparison and reconfiguration steps

Engineering Contradiction:

Improveinterference evaluation accuracyVSAvoidhandover process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The reconfiguration action is extracted as a conditional step rather than a mandatory step in the handover process. The target base station extracts only the necessary reconfiguration operation when the frequency sets differ, avoiding unnecessary complexity in the standard handover流程.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The frequency set configuration is performed in advance by the source base station, and the target base station only performs a simple comparison operation during handover, avoiding the need for complex real-time frequency set generation and configuration procedures.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If the target base station reconfigures a coexistent interference frequency set for UE during handover, then the UE can maintain proper interference evaluation, but the system performance decreases due to redundant configuration when frequency sets are identical

Engineering Contradiction:

Improveinterference evaluation capabilityVSAvoidsystem performance

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The target base station uses feedback from comparing the source base station's frequency set with its own preset set to determine whether reconfiguration is necessary. This feedback mechanism ensures that reconfiguration is performed only when needed, maintaining system performance.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The frequency set is configured in advance by the source base station, allowing the target base station to simply compare and decide during handover without performing full reconfiguration procedures, thus maintaining high system performance.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP2849479B1Handover signalling reduction for in device interference measurements configuration

Publication Date: 2020.04.15 FUJITSU LTD

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AI summary

Embodiments of the present disclosure provide a configuration method for a coexistent interference frequency set, a base station and UE. The method includes: receiving, by a target base station, a first coexistent interference frequency set configured for UE, transmitted by a source base station, when the UE is handed over from the source base station to the target base station; and comparing the first coexistent interference frequency set with a preset second coexistent interference frequency set by the target base station, and not reconfiguring a coexistent interference frequency set for the UE by the target base station if a result of the comparison is that they are identical. With the embodiments of the present disclosure, configuration of coexistent interference frequency by the base station may be reduced, waste of system resources is lowered, and performance of the system is improved.