Multi-TAG Capability Signaling for Intra-Cell Multi-TRP Timing
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing multiple timing advances for wireless devices, particularly in heterogeneous networks with varying cell sizes and technologies, leading to inefficiencies and increased latency.
Innovation Solution
Implementing multiple timing advance groups (TAGs) to manage timing adjustments dynamically based on device capabilities and network conditions, allowing for more precise synchronization and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single timing advance is used for all uplink transmissions, then device complexity is reduced, but synchronization accuracy deteriorates in heterogeneous networks with varying cell sizes
Solution Approach 1:
The patent divides the uplink transmission timing management into multiple independent timing advance groups (TAGs), where each TAG can be configured with its own timing advance value. This segmentation allows different cell groups to have optimized timing advances tailored to their specific cell sizes and propagation characteristics, thereby improving synchronization accuracy without requiring a complete redesign of the device architecture.
Solution Approach 2:
The patent introduces dynamic timing advance adjustment mechanisms where the network can configure and update timing advance values for different TAGs based on real-time network conditions, cell size variations, and device mobility. This dynamic approach enables the system to adapt timing synchronization to changing heterogeneous network environments, improving accuracy while maintaining manageable device complexity through standardized procedures.
2Measurement precision
If multiple timing advance groups are implemented to improve synchronization in heterogeneous networks, then synchronization accuracy is improved, but device complexity increases
Solution Approach 1:
The patent designs the multiple TAG mechanism with universal applicability across different network scenarios and device types. The same TAG configuration and management procedures can be applied whether the device is connected to one cell or multiple cells, whether in heterogeneous or homogeneous networks. This universality allows the system to achieve improved synchronization accuracy through multiple TAGs while avoiding excessive device complexity by reusing standardized protocols and procedures across diverse scenarios.
3Measurement precision
If timing advances are optimized for each cell group, then synchronization accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent applies local quality optimization by configuring timing advance parameters specifically for each TAG based on the local characteristics of the associated cell group, such as cell size and propagation delay. Rather than using a uniform timing advance for all cells, each TAG receives locally optimized timing advance values tailored to its specific environment. This approach improves synchronization accuracy for each cell group while managing signaling overhead by only transmitting the necessary differential timing advance information for each TAG.
Data Source
AI summary
A wireless device transmits a user equipment (UE) capability message comprising a first parameter, per band combination, indicating a maximum number of timing advance groups (TAGs) that the wireless device supports. The UE capability message further comprises a second parameter, per cell, indicating whether the wireless device supports two TAGs for intra-cell multiple transmission and reception point (multi-TRP) operation. The wireless device receives one or more radio resource control (RRC) messages two TAGs for a cell and a plurality of transmission configuration indicator (TCI) states for uplink transmissions via the cell. The wireless device receives downlink control information (DCI) indicating a TCI state 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.