Multi-TAG Timing Advance for Intra-Cell Multi-TRP Uplink Sync
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing timing advance values for multiple user equipment (UE) in heterogeneous networks, leading to suboptimal performance and interference, particularly in 5G New Radio (NR) networks.
Innovation Solution
Implementing multiple timing advance groups (TAGs) to manage timing advance values dynamically based on UE categories and network conditions, allowing for more precise synchronization and reduced interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple timing advance groups are implemented to improve synchronization accuracy, then synchronization precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the timing advance management into multiple independent groups (TAGs), where each group can be configured and managed separately. This segmentation allows precise control over different sets of physical cell IDs and timing advance values, improving synchronization accuracy while keeping each group's complexity manageable through modular organization
Solution Approach 2:
The patent implements dynamic configuration of timing advance groups, allowing the network to activate, deactivate, and reconfigure TAGs based on current network conditions and UE requirements. This dynamic approach enables the system to adapt synchronization precision to actual needs, avoiding the complexity of permanently maintaining multiple fixed TAG configurations
2Reliability
If multiple timing advance groups are implemented to reduce interference, then network performance is improved, but device complexity increases
Solution Approach 1:
The patent applies different timing advance configurations to different local contexts by assigning specific TAGs to specific physical cell ID sets. This allows interference reduction to be targeted at specific cell groups or geographic areas rather than applying uniform complexity across the entire network, improving performance locally while managing overall system complexity
Solution Approach 2:
The timing advance group structure is designed to serve multiple functions simultaneously: synchronization, interference management, and support for heterogeneous network configurations. By creating a universal TAG framework that can handle various scenarios (single TAG, multiple TAGs, different cell configurations), the patent reduces the need for separate mechanisms, thereby improving network performance without proportionally increasing complexity
Data Source
AI summary
A wireless device transmits a user equipment (UE) capability message. The UE capability message comprises: a first parameter indicating, per cell, whether the wireless device supports two timing advance groups (TAGs) for intra-cell multiple transmission and reception point (multi-TRP) operation; and a second parameter indicating, per band combination, a maximum number of TAGs that the wireless device supports. The wireless device receives one or more radio resource control (RRC) messages indicating: transmission configuration indicator (TCI) states for uplink transmissions via a cell; and two TAGs for the cell. The wireless device receives downlink control information (DCI) indicating a TCI state among the TCI states for the cell. The TCI state is associated with a TAG among the two TAGs of the cell. The wireless device transmits, based on a timing advance of the TAG associated with the TCI state, an uplink transmission using the TCI state.