Carrier Grouping With Dynamic Timing Advance Groups

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Solution Overview

Problem

Existing multicarrier communication systems face challenges in efficiently managing multiple timing advance groups, particularly in scenarios involving handovers and cell group configurations, leading to inefficiencies and increased handover overhead.

Innovation Solution

The implementation of multiple timing advance groups (TAGs) with mechanisms for dynamic configuration and reconfiguration, including random access procedures and RRC signaling, to align uplink transmission timing across serving cells, allowing for efficient operation and reduced handover delays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple timing advance groups are managed in existing multicarrier systems, then uplink transmission timing can be aligned across serving cells, but handover overhead and delays increase

Engineering Contradiction:

Improveuplink transmission timing alignmentVSAvoidhandover delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system segments timing advance management into multiple independent TAGs (Timing Advance Groups), where each TAG can be independently configured and managed. This segmentation allows handovers to occur within a TAG without requiring reconfiguration of the entire carrier aggregation setup, thereby reducing handover delays while maintaining timing alignment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic TAG configuration where TAGs can be created, modified, and released based on real-time network conditions and handover requirements. The network can dynamically assign serving cells to different TAGs and adjust timing advance values without interrupting uplink transmission, enabling flexible adaptation during handovers.

Inventive Principle:

Principle #15Dynamics

2Productivity

If multiple timing advance groups are configured dynamically, then handover efficiency improves, but system complexity increases

Engineering Contradiction:

Improvehandover efficiencyVSAvoidTAG configuration complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system performs preliminary TAG configuration during initial connection establishment and cell addition, preparing the timing advance group structure in advance. This preliminary setup includes pre-configuring TAG identities and associations with serving cells, so that when handovers occur, the infrastructure is already in place and only minor adjustments are needed, reducing overall complexity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback mechanisms where the network monitors timing advance group performance and handover metrics, then uses this information to optimize TAG configurations. The system adjusts TAG assignments and parameters based on observed network conditions, reducing the need for complex manual configuration while improving handover efficiency.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250301470A1Carrier Grouping in Multicarrier Wireless Networks

Publication Date: 2025.09.25 COMCAST CABLE COMM LLC

AI summary

Methods, systems, and apparatuses are described for wireless communications. Cells may be grouped into a plurality of cell groups. A base station may transmit a control message to modify a cell group of a cell associated with a wireless device.