Per-Beam Failure Detection for Wireless Reliability
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Solution Overview
Problem
Existing beam failure detection techniques in wireless communications systems are inadequate, leading to reduced communication reliability due to insufficient detection of individual beam failures, especially in millimeter wave frequencies where signal attenuation and interference are significant.
Innovation Solution
Implementing a per-beam basis beam failure detection (BFD) procedure where user equipment (UE) monitors beam failure reference signals, estimates block error rates, and indicates beam failures to the base station, allowing for timely and accurate recovery actions based on configured thresholds and timers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing beam failure detection techniques are used, then the system operates with simpler detection mechanisms, but communication reliability deteriorates due to insufficient detection of individual beam failures
Solution Approach 1:
The patent segments the beam failure detection process into individual per-beam monitoring units. Each beam is assigned its own reference signal and detection counter, allowing independent failure detection for each beam rather than treating all beams as a single unit. This segmentation enables more reliable detection of individual beam failures while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The patent implements feedback mechanisms where the UE monitors reference signals on each beam, determines block error rates, and provides feedback indications to the network when beam failures are detected. The network responds with beam failure recovery requests, creating a closed-loop feedback system that continuously adapts to channel conditions and maintains communication reliability.
2Measurement precision
If per-beam beam failure detection is implemented, then detection accuracy improves for individual beam failures, but the complexity of monitoring and managing multiple beams increases
Solution Approach 1:
The detection system is divided into independent per-beam monitoring units, each with its own reference signal configuration and failure counter. This segmentation allows precise detection of individual beam failures without requiring complex cross-beam analysis, thereby improving measurement precision while keeping the complexity of each monitoring unit manageable and modular.
Solution Approach 2:
Each beam is monitored with locally optimized parameters including beam-specific reference signals, individual block error rate thresholds, and separate failure counters. This local quality approach allows the system to adapt detection sensitivity to the specific characteristics of each beam, improving detection accuracy for individual beams while avoiding the need for complex global optimization algorithms.
3Speed
If beam failure detection threshold is set low for fast detection, then response speed improves, but false detections increase due to noise
Solution Approach 1:
The system performs preliminary actions by configuring multiple reference signals per beam and establishing predetermined block error rate thresholds before actual beam failure detection begins. These preliminary configurations include setting up the detection criteria and counters in advance, allowing the system to quickly compare incoming measurements against pre-established thresholds, thereby achieving fast detection without compromising reliability through noise-induced false alarms.
Solution Approach 2:
The feedback mechanism incorporates predetermined thresholds that are optimized to balance detection speed and accuracy. When block error rates exceed these pre-configured thresholds, the system immediately triggers beam failure indication, providing fast response. The feedback loop allows the network to adjust these thresholds based on observed channel conditions, maintaining detection accuracy while preserving rapid response capability.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a base station, control signaling indicating an activation of a beam failure detection (BFD) procedure for detecting beam failure on a per-beam basis for a set of beams. The UE may receive control signaling indicating BFD parameters for each beam to use in accordance with the BFD procedure. The UE may monitor for a set of reference signals via the set of beams and maintain, at a medium access control (MAC) layer, a separate beam failure indication (BFI) counter and a BFD timer for each beam. The MAC layer may receive the BFIs from a physical layer at the UE such that if the BFI counter for a beam satisfies a configured BFI threshold count before a configured BFD timing duration, the UE may transmit a beam failure recovery request to the base station for the beam.