Timing Advance Group Management for Uplink Synchronization
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing multiple timing advance groups, particularly in LTE networks, where synchronizing uplink and downlink transmissions across various cells is complex and prone to timing misalignment, leading to interference and reduced network performance.
Innovation Solution
The implementation of multiple timing advance groups (TAGs) within LTE networks, allowing for dynamic configuration and reconfiguration of TAGs based on real-time conditions, such as user equipment mobility and signal strength, using RRC signaling to manage SCell additions and changes, and employing timing advance commands to align uplink transmissions across different cell groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple timing advance groups are implemented to manage uplink transmissions across multiple cells, then timing alignment is improved, but device complexity increases
Solution Approach 1:
The patent divides the uplink transmissions into multiple timing advance groups (TAGs), where each TAG is managed with a separate timing advance value. This segmentation allows independent timing control for different cell groups, resolving the timing alignment issue while maintaining manageable complexity through structured organization.
Solution Approach 2:
The patent implements dynamic configuration and reconfiguration of timing advance groups based on real-time conditions such as user equipment mobility and signal strength. The network can add, remove, or modify TAGs as needed, allowing the system to adapt to changing conditions while optimizing timing alignment without permanent complexity increases.
2Adaptability or versatility
If timing advance groups are dynamically reconfigured based on real-time conditions, then adaptability is improved, but control complexity increases
Solution Approach 1:
The system continuously monitors real-time conditions including user equipment mobility and signal strength, and uses this feedback to dynamically reconfigure timing advance groups. The network receives measurement reports from UEs and adjusts TAG configurations accordingly, enabling adaptability through closed-loop control while managing complexity through standardized feedback mechanisms.
Solution Approach 2:
The patent establishes timing advance group configurations in advance through RRC signaling before actual uplink transmissions occur. The network pre-configures TAGs with specific cells and timing advance values, so that when transmissions begin, the timing alignment is already optimized, reducing the need for complex real-time adjustments.
3Reliability
If RRC signaling is used to manage SCell additions and changes, then reliability is improved, but transmission time increases
Solution Approach 1:
The patent uses RRC signaling to pre-configure timing advance group parameters, cell associations, and timing advance values before uplink transmissions begin. This preliminary configuration ensures that when SCells are added or modified, the timing alignment is already optimized, reducing the need for iterative adjustments and minimizing transmission delays.
Solution Approach 2:
The system enables UEs to autonomously apply timing advance values to the correct timing advance groups based on RRC configuration messages. The UE self-manages the association between cells and TAGs, and automatically adjusts uplink transmission timing without requiring network intervention for each adjustment, reducing signaling overhead and transmission time.
Data Source
AI summary
A base station transmits to a wireless device at least one timing-advance command (TAC) for a secondary cell group. Each of the at least one TAC includes a timing-advance value (TAV) to be employed by the wireless device to update a first TAV. The base station transmits, to the wireless device and after the TAT expires, a second TAC with a TAV of zero for the secondary cell group. The base station receives uplink signals from the wireless device according to the updated first TAV.