Multi-TRP Uplink Timing Advance Groups for Accurate Alignment
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing multiple timing advances for uplink transmissions to multiple transmission reception points (TRPs), particularly in determining appropriate timing advance values and reference timings for efficient communication.
Innovation Solution
The implementation of timing advance groups (TAGs) for intra-frequency communications with multiple TRPs, along with mechanisms for associating TAGs with specific uplink transmissions and managing HARQ buffers, allows for efficient timing alignment and resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple timing advance values are used for multiple TRPs, then uplink timing alignment accuracy is improved, but system complexity increases
Solution Approach 1:
The system segments timing advance management by introducing Timing Advance Groups (TAGs), where each TAG is associated with a specific TRP and maintains its own timing advance value. This allows different timing adjustments for different TRPs while organizing the complexity into manageable groups rather than handling each TRP individually.
Solution Approach 2:
The patent introduces TAGs as an intermediary layer between the UE and multiple TRPs. Each TAG acts as a mediator that groups specific TRPs and manages their timing advance values, simplifying the overall system architecture by providing a structured intermediate level of control.
2Reliability
If separate time alignment timers are maintained for each TAG, then timing management reliability is improved, but signaling overhead increases
Solution Approach 1:
The system dynamically manages time alignment timers based on TAG configuration. Each TAG can have its own time alignment timer that is independently controlled, allowing the system to adapt timing management to specific TRP requirements while providing flexibility to optimize signaling overhead based on operational needs.
3Reliability
If multiple TCI states are configured for different TRPs, then communication robustness is improved, but configuration complexity increases
Solution Approach 1:
The patent segments TCI state configuration by associating specific TCI states with specific TAGs and TRPs. This segmentation allows the system to configure robust multi-TRP communication by assigning appropriate TCI states to each TRP group while organizing the complexity into structured associations rather than unmanaged configurations.
Data Source
AI summary
Systems, methods, and apparatuses for enabling multiple timing advances (TAs) for multiple transmission reception points (TRPs) are disclosed herein. In embodiments, a UE may perform timing advance group (TAG) association for different uplink (UL) transmissions for mTRP use, where a pair of inter-frequency TAGs respectively corresponding to a pair of TRPs is used by the UE for determining TAs for UL transmissions to each TRP. In embodiments, a UE performs downlink (DL) reference timing determinations for two TAs for mTRP use, with such determinations being based on one or more aspects of one or more active transmission configuration indicators (TCI) usable for UL at the UE. In embodiments, a UE handles cases of overlapped UL transmissions on two respective UL panels due to the use of two TAs corresponding to a pair of TRPs. Network behavior and signaling corresponding to these aspects is also discussed.