Proactive Wake-Up Beam Management for C-DRX Latency Reduction
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Solution Overview
Problem
In wireless communication networks, particularly during connected mode discontinuous reception (C-DRX) operation, beam degradation can lead to failures in receiving wake-up signals, resulting in high latency and inefficiencies due to the need for beam-failure recovery procedures, especially in scenarios with long DRX cycles or high user equipment (UE) mobility.
Innovation Solution
A method where user equipment (UE) monitors synchronization signal blocks (SSBs) or reference signals associated with wake-up beams and determines if they satisfy a distress condition, transmitting a distress indication to the network entity, which then adjusts the set of wake-up beams to exclude failed beams, thereby reducing latency and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors wake-up beams during C-DRX operation, then the reliability of wake-up signal reception is improved, but the latency increases due to beam-failure recovery procedures
Solution Approach 1:
The UE proactively monitors the quality of wake-up beams before actual wake-up signals are transmitted by performing measurements on SSBs or reference signals associated with wake-up beams during C-DRX OFF periods. This preliminary quality assessment allows the UE to identify distressed beams in advance and trigger beam failure recovery procedures before critical failures occur, thereby maintaining reliable wake-up signal reception while minimizing latency.
2Measurement precision
If the UE continuously monitors wake-up beam quality, then the detection precision of beam failures is improved, but the energy consumption increases
Solution Approach 1:
The UE performs periodic monitoring of wake-up beam quality during C-DRX OFF periods rather than continuous monitoring. The UE measures the quality of wake-up beams at predetermined intervals defined by C-DRX cycle configurations, allowing the UE to detect beam failures with sufficient precision while conserving energy by maintaining sleep states between measurement periods.
3Area of stationary object
If the network entity transmits multiple wake-up beams, then the coverage area is expanded, but the device complexity increases
Solution Approach 1:
The network entity transmits multiple wake-up beams corresponding to different spatial directions or coverage areas, with each beam associated with specific SSBs or reference signals. The UE monitors quality metrics for each individual beam separately and can identify which specific beams are distressed. This segmentation allows comprehensive coverage while managing complexity through independent beam assessment and selective recovery procedures.
Data Source
AI summary
The present disclosure provides for proactive wake-up beam management for connected mode discontinuous reception (C-DRX) operation. For example, a user equipment (UE) monitor one or more synchronization signal blocks (SSBs) or reference signals received associated with a set of wake-up beams from a network entity. The UE may further determine that the set of wake-up beams satisfies a distress condition. The UE may additionally transmit a distress indication to the network entity based on determining that the set of wake-up beams satisfies the distress condition. Aspects described herein also provide a network entity that receives a distress indication from the UE in response to transmitting a set of wake-up beams and transmits a subsequent set of wake-up beams having at least one wake-up beam different not included in the set of wake-up beams to the UE.