Sidelink Ranging Bandwidth Adjustment for V2X Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In distributed wireless communication systems, achieving accurate positioning and ranging without centralized control is challenging due to limitations in bandwidth management and listen-before-transmit (LBT) procedures, particularly in scenarios with adverse weather or poor satellite signal reception, which affects the accuracy and reliability of vehicle-to-everything (V2X) communications.
Innovation Solution
User equipment (UEs) dynamically adjust the bandwidth of ranging signals based on the accuracy of ranging sessions and LBT success rates, using variance analysis and threshold comparisons to optimize bandwidth in subsequent sessions, ensuring improved accuracy and reliability in positioning and ranging operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the bandwidth of ranging signals is increased to improve ranging accuracy, then the measurement precision improves, but the probability of successful LBT procedures decreases
Solution Approach 1:
The patent implements dynamic bandwidth adjustment where the bandwidth of ranging signals is not fixed but adapts based on LBT success probability. The system monitors LBT outcomes and adjusts bandwidth in real-time, transitioning from static to dynamic operation to balance accuracy and reliability requirements
Solution Approach 2:
The patent changes the bandwidth parameter of ranging signals based on observed LBT success rates. When LBT success probability falls below a threshold, the system reduces bandwidth to improve LBT success, and when success probability is adequate, it increases bandwidth to improve ranging accuracy, thereby optimizing both parameters across different operating conditions
2Measurement precision
If the bandwidth of ranging signals is increased to improve ranging accuracy, then the measurement precision improves, but the device complexity increases due to bandwidth management
Solution Approach 1:
The patent employs feedback mechanisms where ranging accuracy measurements and LBT success rates are fed back to the bandwidth management system. This closed-loop control automatically adjusts bandwidth based on performance metrics, reducing the need for complex manual configuration and decision-making logic
Solution Approach 2:
The system performs self-optimization by automatically monitoring its own performance (ranging accuracy and LBT success) and adjusting bandwidth parameters without external intervention. The distributed UEs independently manage their own bandwidth allocation based on local observations, eliminating the need for centralized control
Data Source
AI summary
The bandwidth of ranging signals used in ranging session in a distributed system are dynamically adjusted based on the accuracy of the ranging over multiple ranging sessions and optionally based on the probability of successful Listen Before Transmit (LBT) procedure over the multiple ranging sessions. The accuracy of the ranging may be determined, e.g., based on the variance of determined ranges over a number of ranging sessions, which may be compared to a threshold to indicate low accuracy ranging. The bandwidth of the ranging signals may be increased based on an indication of low accuracy ranging. If the ranging signals are broadcast on unlicensed spectrum using LBT procedures, the probability of successful LBT procedures by the initiator UE, the responder UEs, or all participating UEs may be used to determine whether bandwidth of the ranging signals should be decreased.