Beam Failure Detection in DRX Mode for 5G UE Power Management
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently detecting beam failures while implementing DRX (Discontinuous Reception) to conserve power, as existing methods require frequent wake-ups to assess radio link quality, reducing power savings.
Innovation Solution
The solution involves configuring a beam failure indication period based on the maximum between the shortest periodicity of reference signals and the DRX period, allowing radio link quality measurements during the DRX active time, thereby avoiding wake-ups during the off duration and maintaining power savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE wakes up frequently to assess radio link quality during DRX off duration, then beam failure detection reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by performing radio link quality measurements during the DRX on duration (when the UE is already awake and active) instead of during the off duration. This advance measurement allows the network to assess beam quality before the UE enters power-saving mode, eliminating the need for wake-ups during off duration while maintaining detection reliability.
Solution Approach 2:
The patent implements periodic action by configuring the UE to perform beam failure detection measurements at specific periodic intervals aligned with DRX on durations. This periodic measurement approach ensures continuous monitoring capability while respecting the DRX power-saving mechanism, as measurements are performed during active periods rather than requiring frequent wake-ups.
2Loss of energy
If the UE performs radio link quality measurements during DRX on duration, then power savings are maintained, but beam failure detection timeliness may be compromised
Solution Approach 1:
The patent uses preliminary action to perform beam quality assessments during the DRX on duration before potential beam failures occur during off duration. By conducting measurements in advance during active periods, the system maintains both power savings (no wake-ups needed) and detection timeliness (failures are detected before affecting communication).
Solution Approach 2:
The patent implements feedback mechanisms where the UE reports beam failure indications to the network based on measurements taken during DRX on duration. This feedback loop ensures that even though measurements are performed during active periods, the system maintains responsive beam failure detection and can trigger recovery procedures timely.
3Use of energy by moving object
If the beam failure indication period is set to match DRX period, then power consumption is reduced, but measurement frequency is limited
Solution Approach 1:
The patent applies preliminary action by performing multiple measurements during each DRX on duration rather than waiting for the next periodic opportunity. This allows the system to conduct more frequent measurements during active periods when the UE is already awake, effectively increasing measurement frequency without requiring additional wake-ups during off duration.
Solution Approach 2:
The patent implements partial action by performing beam failure detection measurements only during DRX on duration (not during off duration), which is a subset of the full operational period. This partial measurement approach maintains power savings while providing sufficient measurement frequency through multiple on-duration cycles, avoiding the need for excessive wake-ups.
Data Source
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AI summary
The apparatus configured to provide an enhanced power management solution, by configuring the UE to perform a Beam Failure Detection (BFD) procedure in view of the DRX configuration of the UE and a periodicity of reference signal(s) used to assess a radio link quality. The apparatus receives a DRX configuration having a DRX period comprising a DRX on duration and a DRX off duration. The apparatus then determines a beam failure indication period based on a periodicity for reference signals (RSs) configured for beam failure detection and a DRX period. Then, the apparatus performs a radio link quality measurement of at least one of the RSs based on the beam failure indication period determined by the UE.