Sidelink PRS Scheduling Using Channel Busy Ratio for V2X Positioning
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing congestion for sidelink positioning, particularly in scenarios requiring high reliability and low latency, such as vehicle-to-everything (V2X) communications, where the transmission of positioning reference signals (PRS) is not optimally controlled based on channel busy ratios (CBR).
Innovation Solution
A method and apparatus for sidelink positioning that adjusts transmission parameters of PRS based on measured CBR, including threshold settings and pattern determination to optimize PRS transmission and reception among user equipment (UEs), using confidence levels and positioning quality indicators (PQI) to manage congestion and ensure reliable positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If positioning channel resources are increased to improve positioning accuracy and coverage, then positioning performance is improved, but channel congestion and interference increase
Solution Approach 1:
The patent applies dynamics by making the PRS transmission configuration adjustable based on channel conditions. The network device dynamically configures PRS transmission parameters including time-frequency resources, power, and bandwidth according to measured channel busy ratio, allowing the system to adapt positioning resource usage to current traffic conditions and minimize congestion while maintaining positioning accuracy when needed.
Solution Approach 2:
The patent changes physical parameters of PRS transmission by adjusting transmission power, bandwidth, and time-frequency resource allocation based on channel busy ratio measurements. When channel congestion is detected, the system reduces PRS transmission power or bandwidth to decrease interference, while maintaining sufficient positioning capability through optimized parameter selection.
2Reliability
If PRS transmission power is increased to improve positioning signal quality, then positioning reliability is improved, but channel interference increases
Solution Approach 1:
The patent implements feedback control by measuring channel busy ratio and using this information to adjust PRS transmission power. The network device continuously monitors channel conditions and provides feedback to configure appropriate transmission power levels, ensuring positioning reliability is maintained while minimizing unnecessary interference to other users.
Solution Approach 2:
The patent changes the transmission power parameter of PRS based on channel busy ratio measurements. The system dynamically adjusts power levels to match actual channel conditions, increasing power when positioning reliability is needed and reducing power when channel congestion is present, thereby balancing reliability and interference.
3Productivity
If more UEs transmit positioning packets simultaneously to improve positioning speed, then positioning efficiency is improved, but channel congestion increases
Solution Approach 1:
The patent applies periodic action by configuring PRS transmission with specific periodicity and time patterns. The network device controls when UEs transmit positioning packets through configured grants and periodic references, distributing transmissions over time to avoid simultaneous collisions while maintaining efficient positioning updates at appropriate intervals.
Solution Approach 2:
The patent makes positioning transmission timing dynamic by adjusting resource allocation based on channel busy ratio. The system dynamically assigns time-frequency resources for positioning packets, controlling the rate and timing of transmissions to optimize positioning efficiency while preventing channel congestion from excessive simultaneous traffic.
Data Source
AI summary
Disclosed according to various embodiments is a method for transmitting a signal related to positioning by a first terminal in a wireless communication system supporting sidelink communication. Disclosed are a method and an apparatus, the method comprising the steps of: measuring a channel busy ratio (CBR) in a resource area preconfigured to perform positioning; transmitting a positioning packet including scheduling information for a positioning reference signal (PRS); and transmitting the PRS to neighboring terminals on the basis of the scheduling information, wherein the positioning packet includes a first threshold value related to the reliability of an absolute position for specifying a neighboring terminal which is to transmit a response PRS to the PRS, and the first threshold value is determined on the basis of the CBR.