DRX Beam Monitoring for Proactive Beam Failure Reporting
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Solution Overview
Problem
Existing beam failure detection (BFD) procedures in discontinuous reception (DRX) mode fail to maintain beam quality due to UE not monitoring the physical layer during the OFF duration of the DRX cycle, leading to potential communication link interruptions.
Innovation Solution
The UE generates and transmits a beam condition report at the end of the ON duration of the DRX cycle when certain conditions are met, indicating potential beam failure or the need for beam switching, allowing the network entity to adjust beams proactively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE does not monitor the physical layer during the OFF duration of the DRX cycle, then power consumption is reduced, but beam quality cannot be maintained and communication link interruptions may occur
Solution Approach 1:
The UE performs preliminary beam quality assessment during the ON duration by monitoring BFD-RS and evaluating beam metrics. It proactively identifies potential beam failures before they occur and transmits beam condition reports to the network entity, allowing beam switching to be prepared in advance rather than reactively after link interruption.
Solution Approach 2:
The UE implements a feedback mechanism by continuously monitoring beam failure detection reference signals and transmitting beam condition reports to the network entity when beam quality degrades. This feedback loop enables the network to adjust beams proactively based on real-time conditions, maintaining link reliability during DRX operation.
2Reliability
If the UE monitors beam failure detection reference signals continuously, then beam quality can be maintained, but power consumption increases during DRX operation
Solution Approach 1:
The UE performs beam failure detection reference signal monitoring periodically during the ON duration of the DRX cycle rather than continuously. This periodic monitoring approach maintains beam quality awareness while significantly reducing power consumption compared to continuous monitoring, as the UE can enter low-power state during OFF durations.
Solution Approach 2:
The UE concentrates beam monitoring efforts during the ON duration to perform preliminary beam quality assessments before the OFF duration begins. By completing beam evaluations and transmitting condition reports during active periods, the UE prepares for the upcoming low-power state without compromising beam reliability.
3Loss of time
If the UE transmits beam condition reports only upon beam failure detection, then transmission frequency is reduced, but latency increases when beam switching is needed
Solution Approach 1:
The UE transmits beam condition reports proactively when beam quality metrics indicate degradation trends, even before formal beam failure is detected. This preliminary reporting allows the network entity to initiate beam switching procedures in advance, reducing the overall latency compared to waiting for complete beam failure before taking action.
Solution Approach 2:
The UE implements continuous beam quality monitoring with feedback transmission triggered by quality thresholds. When beam metrics cross predefined thresholds indicating potential failure, the UE immediately reports conditions to the network, enabling timely beam switching decisions that balance transmission frequency with latency reduction.
Data Source
AI summary
Certain aspects of the present disclosure provide a method for wireless communications by a user equipment (UE). The UE receives a beam monitoring configuration indicating at least one condition to be satisfied for transmission of a beam condition report. The UE monitors at least one beam failure detection (BFD)-reference signal (RS) during an ON duration of a discontinuous reception (DRX) cycle. The UE transmits the beam condition report, at an end of the ON duration of the DRX cycle, when the at least one condition is satisfied during the ON duration of the DRX cycle.