5G Beam Recovery via Dynamic Active Time Window Adjustment
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Solution Overview
Problem
In 5G mobile communication systems, especially in unlicensed frequency bands, beam failure detection (BFD) is challenging due to uncertainties in channel idle detection, leading to insufficient BFD RS transmission, which hampers accurate beam state evaluation and fast recovery.
Innovation Solution
A method for beam recovery that dynamically adjusts the active time window by increasing the number of monitoring occasions based on BFD RS detection results, ensuring reliable beam failure detection and recovery, even in uncertain transmission conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of monitoring occasions is increased to improve beam failure detection accuracy, then the reliability of beam state evaluation is improved, but the device complexity and resource overhead increase
Solution Approach 1:
The patent applies dynamics by making the active time window length configurable and adjustable based on detection needs. The window can be dynamically set to different durations (e.g., 1, 2, 4, or 8 slots) depending on the beam failure detection requirements, allowing the system to adapt between shorter windows for faster response and longer windows for more accurate evaluation without fixed constraints
Solution Approach 2:
The patent changes the parameter of active time window length to resolve the contradiction. By configuring the window to span multiple slots (1-8 slots) rather than being fixed to a single slot, the system can accumulate more BFD RS detection results within the window, improving detection accuracy while managing resource usage through controlled window duration
2Measurement precision
If the active time window spans multiple slots to accumulate more BFD RS, then the measurement precision is improved, but the time delay for beam failure detection increases
Solution Approach 1:
The system dynamically adjusts the active time window length based on detection requirements. When fast detection is needed, the window can be set to shorter duration (1-2 slots); when higher accuracy is required, the window can be extended (4-8 slots). This dynamic configuration allows flexible trade-off between detection speed and accuracy
Solution Approach 2:
The patent uses partial action by configuring the active time window to cover only the necessary number of slots required for adequate detection rather than continuously monitoring all slots. The window can be set to 1, 2, 4, or 8 slots depending on the specific detection needs, avoiding excessive monitoring time while ensuring sufficient sampling for accurate beam failure detection
Data Source
AI summary
A method for beam recovery is provided, the method is performed by a terminal and includes: determining, according to a reference signal (RS) detection result for beam failure detection (BFD) on a monitoring occasion within an active time window, an operation for the beam recovery; where the active time window comprises the monitoring occasion with a variable quantity; and before the beam recovery or before a beam pre-recovery process is initiated, a quantity of the monitoring occasions within the active time window is increased according to a RS detection result for each BFD.