Cellular Handover Timing Using Interference Coordination Patterns

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Solution Overview

Problem

Inadequate timing of handover procedures in cellular communications can lead to negative impacts on transmission quality.

Innovation Solution

Implementing interference coordination patterns to schedule handover commands and random access procedures based on interference patterns between source and target base stations, ensuring minimal interference during the handover process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If handover is performed without interference coordination, then handover speed is maintained, but transmission quality deteriorates due to interference between source and target base stations

Engineering Contradiction:

Improvetransmission qualityVSAvoidhandover timing

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The source base station determines an interference coordination pattern before transmitting the handover command to the terminal device. This pattern specifies time resources where the target base station should avoid transmissions to minimize interference. By preparing this coordination pattern in advance and incorporating it into the handover command, the system ensures that interference mitigation is already in place before the handover executes, thus improving transmission quality without delaying the handover process

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The interference coordination pattern acts as an intermediary mechanism between the source and target base stations. It provides a structured way to coordinate their transmissions during handover, specifying which time resources should be avoided by the target base station. This intermediary pattern enables the two base stations to work together to reduce interference while maintaining efficient handover timing

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If interference coordination pattern is implemented, then transmission quality improves, but device complexity increases due to additional signaling and processing

Engineering Contradiction:

Improvehandover reliabilityVSAvoidbase station coordination complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The interference coordination pattern is implemented by changing the time resource parameters of the target base station's transmissions. Instead of complex spatial or frequency coordination, the system uses time-domain parameter adjustments where the target base station simply avoids transmitting during specific time resources indicated in the handover command. This parameter-based approach simplifies the coordination mechanism while maintaining reliable handover

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The interference coordination information is extracted and embedded directly within the handover command message that is already being transmitted from the source to the terminal device. By taking out the coordination pattern from separate signaling and incorporating it into the existing handover command structure, the patent avoids adding separate complex signaling procedures, thus reducing overall system complexity while still providing reliable interference coordination

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS12581375B2Interference coordination for mobility

Publication Date: 2026.03.17 NOKIA TECHNOLOGIES OY

AI summary

Disclosed is a method for interference coordination for mobility. A first apparatus receives, from a second apparatus, a first interference coordination pattern of the second apparatus. The first apparatus transmits, to the second apparatus, a first handover request for handing over a first terminal device from the first apparatus to the second apparatus. The first apparatus receives, from the second apparatus, a first handover request acknowledgement comprising at least a first handover command. The first apparatus transmits, to the first terminal device, the first handover command based at least partly on the first interference coordination pattern of the second apparatus.