Adaptive PRS Configuration for Wireless Device Positioning
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in positioning wireless devices due to the always-on nature of Positioning Reference Signals (PRS), which leads to wasted radio resources and increased signaling overhead, especially when positioning performance is poor.
Innovation Solution
Adaptive PRS configuration based on real-time feedback from wireless devices, adjusting transmission on links according to geometric dilution of precision (GDOP), line-of-sight (LOS), and non-LOS characteristics to optimize PRS transmission, reducing unnecessary transmissions and conserving energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PRS is transmitted always-on according to pre-planned configuration, then positioning performance is maintained, but signalling overhead and radio resource waste increase
Solution Approach 1:
The patent applies dynamics by transitioning from static always-on PRS transmission to dynamic adaptive transmission. The network node continuously monitors positioning performance metrics (GDOP, LOS probability) and adjusts PRS transmission configuration in real-time based on current conditions, making the system flexible and responsive rather than fixed
Solution Approach 2:
The patent changes transmission parameters (whether to transmit PRS, transmission timing, frequency resources) based on measured positioning performance characteristics. When GDOP is poor or LOS probability is low, the system modifies these parameters to stop or reduce PRS transmission, thereby reducing overhead while maintaining positioning accuracy when needed
2Reliability
If PRS is transmitted always-on according to pre-planned configuration, then positioning measurements can be performed, but energy consumption increases
Solution Approach 1:
The patent implements periodic monitoring of positioning performance characteristics (GDOP, LOS probability) and uses this periodic feedback to control PRS transmission. Instead of continuous transmission, the system periodically assesses whether transmission is needed and acts accordingly, reducing energy consumption while maintaining positioning capability when required
Solution Approach 2:
The system establishes a feedback loop where positioning performance metrics are measured and fed back to control PRS transmission decisions. This feedback mechanism ensures that energy is consumed for PRS transmission only when it actually contributes to positioning performance, eliminating wasteful energy expenditure during poor positioning conditions
3Measurement precision
If PRS transmission is increased on all links, then positioning accuracy improves, but radio resource efficiency deteriorates
Solution Approach 1:
The patent applies local quality by treating each radio link individually rather than uniformly. The system evaluates positioning performance characteristics (GDOP contribution, LOS probability) specific to each link and makes independent transmission decisions for each link, allocating radio resources locally where they provide actual positioning benefit rather than wasting them on links that don't contribute to accuracy
Data Source
AI summary
A wireless device (12A) is configured to determine, for each of one or more links (14), one or more characteristics associated with wireless device positioning performance on the link. In some embodiments, the one or more characteristics include one or more of: geometric dilution of precision, GDOP, characteristics associated with the link; or line-of-sight, LOS, characteristics or non-LOS characteristics of the link. Regardless, the wireless device (12A) may also be configured to transmit control signaling (22) indicating the one or more characteristics determined for each of the one or more links (14). Based on this control signaling (22), a network node (16) may adapt positioning reference signal, PRS, configuration on at least one of the one or more links (14).