Sidelink Positioning Reference Signal Congestion Control
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Solution Overview
Problem
The challenge of effectively performing congestion control on sidelink positioning reference signals (SL PRS) in communication systems is unclear, which affects positioning accuracy, especially for UEs outside cellular network coverage.
Innovation Solution
A communication method and device that determine parameters for SL PRS based on channel busy ratio (CBR) and/or channel occupancy ratio (CR), including maximum transmission power, bandwidth, number of transmissions, and resource allocation, to manage congestion and improve positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SL PRS transmission is increased to improve positioning accuracy, then positioning accuracy is improved, but channel congestion increases
Solution Approach 1:
The patent implements dynamic adjustment of SL PRS transmission parameters (period, power, bandwidth) based on real-time channel conditions measured by CBR and CR metrics. The terminal device continuously monitors channel occupancy and adapts transmission characteristics to maintain positioning accuracy while preventing congestion, transforming a static transmission approach into a dynamic one that responds to changing channel conditions.
Solution Approach 2:
The patent changes physical transmission parameters of SL PRS including transmission period, transmission power, and bandwidth based on channel conditions. When CBR or CR exceeds thresholds, the system adjusts these parameters (e.g., increases period, reduces power) to control congestion while maintaining sufficient positioning performance, directly applying parameter changes to resolve the contradiction.
2Measurement precision
If SL PRS transmission parameters are optimized for positioning accuracy, then positioning accuracy is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent applies partial action by transmitting SL PRS only when necessary (when positioning services are required and channel conditions permit) rather than continuously. The transmission is activated selectively based on CBR/CR thresholds and positioning requirements, avoiding excessive transmissions that would waste resources while ensuring sufficient transmissions for accurate positioning when needed.
Solution Approach 2:
The system optimizes the balance between positioning accuracy and resource efficiency by dynamically changing transmission parameters. When channel conditions are good, more aggressive transmission parameters (shorter period, higher power) improve positioning accuracy. When channel conditions deteriorate, parameters are adjusted to reduce resource consumption, achieving efficient resource utilization across different operating conditions.
3Measurement precision
If multiple terminal devices transmit SL PRS simultaneously, then positioning coverage is improved, but interference increases
Solution Approach 1:
The patent implements feedback mechanisms where terminal devices monitor channel conditions (CBR, CR) caused by SL PRS transmissions from multiple devices. This feedback information is used to adjust subsequent transmission parameters, creating a self-regulating system that coordinates transmissions across multiple devices to maintain coverage while reducing mutual interference through adaptive parameter adjustment.
Solution Approach 2:
The system dynamically coordinates transmissions from multiple terminal devices by continuously adapting transmission parameters based on real-time channel measurements. When interference levels increase due to multiple simultaneous transmissions, devices dynamically adjust their transmission characteristics to maintain positioning coverage while minimizing harmful interference effects.
Data Source
AI summary
Provided are a communication method and apparatus. The method includes that: a terminal device determines, according to a channel busy ratio (CBR) and/or a channel occupancy ratio (CR), a parameter corresponding to a sidelink positioning reference signal (SL PRS); and the terminal device sends the SL PRS according to the parameter corresponding to the SL PRS.