Beam Failure Detection Counters for Multi-TRP Wireless Systems
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Solution Overview
Problem
Current wireless communication systems, particularly in multi-Transmission/Reception Point (TRP) scenarios, face challenges in efficiently managing beam failures and recovering from them, leading to reduced communication quality and increased latency, especially in high-speed vehicular scenarios and dense deployments.
Innovation Solution
The implementation of a method where User Equipment (UE) maintains multiple counters for each TRP to track beam failure instances, initiating a beam failure recovery procedure when a counter reaches a predefined threshold, and utilizing random access procedures to recover from beam failures, allowing for more efficient beam management and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single counter is used for beam failure detection in multi-TRP scenarios, then the device complexity is reduced, but the reliability of beam failure detection deteriorates due to inability to distinguish failures from different TRPs
Solution Approach 1:
The patent divides the beam failure detection mechanism into separate counters for each TRP (first counter for first TRP, second counter for second TRP). This segmentation allows independent tracking of beam failure instances from different TRPs, enabling reliable detection and differentiation of failure sources without requiring complex unified management systems.
Solution Approach 2:
The patent creates a universal counter management structure where each TRP has its own counter that follows the same detection logic and threshold comparison mechanism. This multi-functional approach allows the system to handle multiple TRPs using consistent procedures, improving reliability while maintaining manageable complexity through standardized processes.
2Loss of time
If beam failure recovery procedure is initiated immediately when beam failure is detected, then the latency is reduced, but the communication quality deteriorates due to premature recovery attempts before confirming actual beam failure
Solution Approach 1:
The patent implements preliminary counting of beam failure instances before initiating recovery procedures. The counter accumulates failure instances and compares against a threshold, allowing the system to prepare for recovery in advance while confirming actual beam failure conditions. This prevents premature recovery attempts while maintaining fast response through pre-configured recovery mechanisms.
Solution Approach 2:
The patent uses feedback through counter comparison with thresholds to determine when to initiate recovery. The system continuously monitors beam failure instances, provides feedback through counter updates, and only triggers recovery when the threshold is met, ensuring reliable detection while maintaining low latency through automated threshold-based decision making.
3Measurement precision
If multiple counters are maintained for different TRPs, then the beam management precision is improved, but the device complexity increases due to additional counter maintenance and synchronization
Solution Approach 1:
The patent segments the beam failure tracking function into dedicated counters for each TRP, allowing precise independent measurement of failures from different TRPs. This segmentation achieves high measurement precision while keeping each counter simple and independent, reducing the overall complexity compared to a unified tracking system.
Solution Approach 2:
The patent applies local quality by giving each TRP its own specialized counter with specific tracking characteristics. This allows optimized precision for each TRP's beam failure detection while maintaining simple, focused counter logic locally, avoiding the complexity of a single complex unified counter system.
4Speed
If random access procedure is initiated for SpCell BFR, then the recovery speed is improved, but the overhead increases due to additional signaling and processing
Solution Approach 1:
The patent performs preliminary beam failure detection and counter evaluation before initiating the random access procedure. By pre-configuring recovery parameters and pre-validating failure conditions through counter thresholds, the system reduces the signaling overhead during actual recovery execution while maintaining fast recovery speed through prepared mechanisms.
Solution Approach 2:
The patent implements self-service through automated counter management and threshold-based recovery triggering. The system autonomously monitors beam failures, updates counters, compares with thresholds, and initiates random access procedures without extensive external signaling or manual intervention, reducing overhead while maintaining rapid recovery response.
Data Source
AI summary
A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE maintains a first counter and a second counter, wherein the first counter and the second counter are associated with a Special Cell (SpCell) and are for counting beam failure instance indications. The UE initiates a first beam failure recovery (BFR) procedure based on the first counter being equal to or larger than a value, wherein the first BFR procedure includes initiating a random access procedure for SpCell BFR associated with the SpCell. The UE sets the first counter and the second counter to a defined value in response to completion of the first BFR procedure.