Dynamic Time Reference Selection for D2D Timing Alignment
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Solution Overview
Problem
In D2D communication scenarios, particularly in V2X communication, achieving precise time reference alignment for radio transmission is challenging due to varying velocities and positions of UEs relative to each other and base stations, leading to inefficiencies in signal reception timing.
Innovation Solution
A method where radio terminals select a time reference type from multiple options based on received selection information, allowing for flexible alignment of reception sampling windows, which can be derived from base station signals, peer UE signals, or absolute time references, enabling precise timing adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single time reference type is used for all D2D communication scenarios, then the system is simple to operate, but the timing alignment precision deteriorates in high-mobility scenarios like V2X
Solution Approach 1:
The patent implements dynamic time reference type selection where the receiving UE adapts the time reference type based on current communication conditions. The system transitions from static to dynamic operation by allowing the time reference type to change according to scenario requirements, thereby achieving high precision in both high-mobility and low-mobility scenarios without requiring a completely complex selection mechanism
Solution Approach 2:
The patent changes the parameter of time reference type (from fixed to variable) to resolve the contradiction. By allowing the time reference type parameter to be adjusted based on scenario conditions, the system achieves precise timing alignment in high-mobility V2X scenarios while maintaining simplicity in low-mobility scenarios through appropriate parameter selection
2Adaptability or versatility
If multiple time reference types are supported for different scenarios, then adaptability improves, but the device complexity increases due to selection and management overhead
Solution Approach 1:
The patent implements self-service through autonomous time reference type selection at the receiving UE. The UE independently determines the appropriate time reference type based on received indication information and current scenario conditions, eliminating the need for complex centralized management and reducing device complexity while maintaining high adaptability across different communication scenarios
Solution Approach 2:
The patent applies preliminary action by pre-defining multiple time reference types and their applicable scenarios. The system prepares multiple time reference options in advance, and the receiving UE selects from these pre-configured options based on indication information, thereby achieving high adaptability without requiring complex real-time decision-making mechanisms
3Reliability
If time reference alignment is optimized for high-mobility scenarios, then timing precision improves for V2X, but performance deteriorates for low-mobility or stationary scenarios
Solution Approach 1:
The patent changes the time reference type parameter based on mobility conditions. For high-mobility V2X scenarios, it selects time reference types with larger offsets to accommodate Doppler shifts and timing variations, ensuring reliable communication. For low-mobility or stationary scenarios, it selects time reference types with smaller or zero offsets to maintain precise timing alignment and high communication efficiency, thereby resolving the trade-off between reliability and productivity
Data Source
AI summary
A radio terminal (110) determines selection information, e.g., by receiving the selection information from another radio terminal (110′) or a base station (100) of a cellular radio network. Depending on the selection information, the radio terminal (110) selects a time reference type from a plurality of time reference types. Based on the selected time reference type, the radio terminal (110) receives signals (204, 208) from a further radio terminal (110′).