Configurable Beam Failure Detection Protocol for 5G Networks
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Solution Overview
Problem
Next-generation wireless communication networks, such as 5G, face challenges in determining beam failure events due to transient obstructions and interference, which can lead to inefficient beam recovery processes and decreased throughput.
Innovation Solution
A configurable beam failure protocol that assesses the importance of beam pair links based on downlink control information, allowing for selective beam recovery by determining the number of decoding candidates and signal quality, thereby minimizing unnecessary recovery procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure detection is performed using traditional methods, then beam recovery can be initiated, but unnecessary recovery procedures increase device complexity and reduce throughput
Solution Approach 1:
The patent changes the parameter for beam failure detection from simple signal quality threshold to a count-based metric. Specifically, it counts the number of failed decoding candidates over a configured window and compares against a threshold. This parameter transformation allows more reliable detection while maintaining manageable complexity through configurable parameters.
Solution Approach 2:
The patent introduces dynamic configurability to the beam failure detection process. The network can configure the number of decoding candidates to monitor, the window size, and the failure threshold. This dynamic adaptation allows the system to adjust detection sensitivity based on channel conditions and service requirements, improving reliability without fixed complexity.
2Reliability
If beam recovery is initiated frequently, then link reliability improves, but network throughput decreases due to retransmissions
Solution Approach 1:
The patent implements a feedback mechanism where the network configures beam failure detection parameters based on observed conditions. The UE monitors decoding candidate failures and provides implicit feedback through uplink transmissions when failure is detected. This feedback loop enables reliable recovery only when necessary, avoiding unnecessary retransmissions that would reduce throughput.
Solution Approach 2:
The patent performs preliminary assessment of beam failure conditions before initiating recovery. By counting failed decoding candidates over a configured window and comparing against a threshold, the system determines whether recovery is truly necessary. This preliminary action prevents premature or unnecessary recovery procedures that would degrade throughput.
3Measurement precision
If beam failure detection sensitivity is increased, then link reliability improves, but false detections increase causing unnecessary recovery
Solution Approach 1:
The patent uses a threshold-based counting approach where the UE counts failed decoding candidates and triggers recovery only when the count exceeds a configured threshold within a window. This partial action approach (not recovering on every failure) filters out transient errors while still detecting genuine beam failures, improving both detection precision and recovery reliability.
Data Source
AI summary
Determining when beam failure of a beam pair link has occurred is provided. Transient obstructions, and other interference effects can cause the failure of a beam pair link which can comprise a transmit beam and a receive beam associated with respective antennas on a transmitter and receiver. Switching to another beam pair link can cause decrease throughput and efficiency however, so the improved mechanism for determining a failure includes taking into consideration the importance of the beam pair link before initiating the beam recovery process. The configurable beam failure protocol defined herein considers the relative importance of the configured beam pair links when declaring the beam pair link a failure. The importance of the beam pair link can be based on the amount of downlink control information in the transmission.