UE-to-UE Beam Maintenance for Low-Latency Sidelink Beamforming
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Solution Overview
Problem
Existing wireless communication systems lack well-defined beam maintenance procedures for sidelink beamforming between user equipment (UE), leading to suboptimal beam selection when UE changes location or orientation, and existing explicit procedures introduce latency or instability in UE-to-UE communication.
Innovation Solution
Implementing UE-to-UE beam maintenance procedures, including implicit and explicit methods, where UEs refine their beams based on reference signaling and feedback, and signaling capabilities to adapt beam maintenance types based on UE motion states, ensuring stability and flexibility in beamforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If explicit beam maintenance procedures are implemented between UEs, then beam selection accuracy is improved, but communication latency increases
Solution Approach 1:
The receiving UE autonomously performs beam refinement by measuring reference signals from multiple transmit beams and selecting the best beam without requiring explicit feedback or coordination from the transmitting UE. This self-service approach eliminates round-trip signaling delays while maintaining accurate beam selection through autonomous measurement and comparison of reference signal qualities.
Solution Approach 2:
The transmitting UE pre-configures multiple reference signal resources corresponding to different transmit beams before beam maintenance is needed. The receiving UE can then perform measurements on these pre-configured resources and maintain updated beam quality information, enabling rapid beam selection without real-time signaling when beam maintenance is triggered.
2Stability of the object's composition
If frequent beam measurements and updates are performed, then beam stability is improved, but signaling overhead and processing complexity increase
Solution Approach 1:
Beam maintenance operations are performed periodically based on configured intervals or triggered by specific events (such as beam quality degradation thresholds) rather than continuously. The receiving UE measures reference signals at these periodic intervals, updates beam quality information only when necessary, and maintains beam stability without requiring constant processing and signaling.
Solution Approach 2:
The system dynamically adjusts beam maintenance parameters such as measurement periodicity, reference signal resources, and beam selection criteria based on current communication conditions, UE mobility state, and beam quality metrics. This allows the system to optimize between beam stability and processing complexity by adapting parameters to actual needs rather than using fixed high-frequency measurements.
3Reliability
If UE beam maintenance capability is enhanced, then communication reliability is improved, but device resource consumption increases
Solution Approach 1:
The receiving UE dynamically adapts its beam maintenance behavior based on its mobility state and communication conditions. When the UE is stationary or moving slowly, more frequent and thorough beam measurements are performed to maintain high reliability. When the UE is moving quickly, the measurement frequency and complexity are reduced to conserve energy, relying on previously established beam information and faster beam switching capabilities.
Solution Approach 2:
The system uses feedback from beam quality measurements to intelligently control when and how beam maintenance is performed. The receiving UE monitors reference signal quality metrics and only triggers beam maintenance operations when quality degradation is detected, avoiding unnecessary measurements and processing when beam conditions are already optimal, thus reducing energy consumption while maintaining reliability.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit signaling regarding a UE-to-UE beam maintenance (BM) procedure supported by the UE. The UE may perform the UE-to-UE BM procedure based at least in part on the signaling. Numerous other aspects are described.