Timing Advance Group Selection for Beam Failure Recovery
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Solution Overview
Problem
In wireless communication systems, particularly in multiple TRP scenarios, existing technologies face challenges in synchronizing timing advance commands effectively during beam failure recovery procedures, leading to potential misapplication of TACs to unintended TAGs, which can result in synchronization errors and resource inefficiencies.
Innovation Solution
A method and apparatus for applying timing advance commands (TACs) to specific timing advance groups (TAGs) based on criteria such as new candidate beam identification, synchronization signal blocks, and beam failure detection reference signals, ensuring the TAC is applied to the intended TAG.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If timing advance commands are applied to multiple TAGs without specific criteria, then the random access procedure can be completed quickly, but timing synchronization errors occur and resources are wasted
Solution Approach 1:
The patent applies different quality characteristics to different TAGs by selectively applying TACs based on specific criteria (new candidate beam identification, SSB association, BFD-RS set failures). This ensures that each TAG receives the appropriate TAC treatment according to its local conditions, improving both speed and accuracy.
Solution Approach 2:
The patent performs preliminary actions by evaluating multiple criteria before applying the TAC to a TAG. The UE determines whether to apply the TAC to a specific TAG by assessing beam failure detection results, candidate beam identification, and SSB associations in advance, preventing misapplication while maintaining efficient procedure completion.
2Reliability
If timing advance commands are applied to the correct TAG, then timing synchronization is accurate, but the complexity of determining which TAG to apply the command increases
Solution Approach 1:
The patent segments the TAG selection process into distinct evaluation criteria: new candidate beam identification, SSB association, and BFD-RS set failure analysis. By dividing the complex decision into manageable segments, the UE can systematically determine the correct TAG without overwhelming complexity.
Solution Approach 2:
The patent employs feedback mechanisms where the UE uses beam failure detection results, candidate beam information, and SSB associations to feedback on which TAG should receive the TAC. This feedback loop ensures accurate TAG selection while providing a structured approach to manage complexity.
3Productivity
If timing advance commands are applied to unintended TAGs, then the random access procedure completes faster, but resource inefficiencies and synchronization errors occur
Solution Approach 1:
The patent changes the parameters for TAC application by modifying the selection criteria based on beam failure detection results, candidate beam identification, and SSB associations. This parameter adjustment ensures that TACs are applied only to appropriate TAGs, improving resource efficiency while maintaining productive procedure completion.
Solution Approach 2:
The patent enables the UE to self-determine the correct TAG for TAC application by autonomously evaluating the available criteria (beam failure detection, candidate beams, SSB associations). This self-service approach ensures resource-efficient TAC application without external intervention, preventing waste while maintaining throughput.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a UE may receive an indication of a first Network TAG associated with a first wireless link and a second TAG associated with a Node Receive configuration information UE second wireless link for a serving cell. The UE may transmit a first RACH message based at least in part on a failure of a BFR procedure associated with at least one of a first BFD-RS set associated with the first wireless link or a second BFD-Receive RS set associated with the second wireless link. The UE may receive, based at least in part on transmitting the first RACH message, a second RACH message that indicates a TAC for the serving cell. The UE may communicate, with the serving cell, based at least in part on application of the TAC to the first TAG or the second TAG.