Candidate Cell Configuration for L1/L2 Handover

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently managing handovers between base stations, particularly in maintaining accurate candidate cell lists and reducing network overhead through Layer 1 and Layer 2 (L1/L2) based mobility, which can lead to reconfiguration failures and increased signaling errors.

Innovation Solution

The implementation of indicators by the source base station to guide wireless devices in selecting target cells for handover, allowing for the update and maintenance of candidate cell lists to remove invalid cells, thereby optimizing handover processes and reducing signaling overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If L1/L2-based mobility is implemented for fast handover, then handover speed is improved, but reconfiguration failure rate increases

Engineering Contradiction:

Improvehandover speedVSAvoidreconfiguration failure rate

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The source base station performs preliminary actions by providing indicators to the wireless device before handover execution, enabling the device to pre-identify valid target cells and prepare configuration information, thereby reducing reconfiguration failures during fast handover

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback mechanisms where the source base station receives measurement reports from the wireless device and provides indicators about valid target cells, creating a closed-loop control that improves handover reliability while maintaining speed

Inventive Principle:

Principle #23Feedback

2Reliability

If comprehensive candidate cell lists are maintained for handover options, then handover reliability is improved, but network signaling overhead increases

Engineering Contradiction:

Improvehandover reliabilityVSAvoidnetwork signaling overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The invention extracts only the essential information needed for handover decision-making by providing indicators that identify valid target cells from the comprehensive candidate cell list, removing unnecessary signaling while maintaining reliability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The candidate cell list is segmented into valid and invalid cells, with only relevant validity information transmitted to the wireless device, reducing signaling overhead while preserving handover reliability

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20240114403A1Candidate Cell Configuration

Publication Date: 2024.04.04 COMCAST CABLE COMM LLC

AI summary

A wireless device may receive a radio resource control (RRC) message that may include a handover indicator and a retain or release indicator. The handover indicator may indicate the target cell for a lower layer-based (e.g., L1/L2-based) handover of the wireless device. After the handover to the target cell, the wireless device may retain or remove/release stored candidate cells for future handovers based on the retain or release indicator.