Inter-frequency SRS for Positioning During Measurement Gaps
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Solution Overview
Problem
Current wireless communication systems, particularly in the transition to 5G, face challenges in efficiently managing positioning reference signals (PRS) and sounding reference signals (SRS) during measurement gaps, which affect spectral efficiency and latency.
Innovation Solution
The method involves configuring multiple frequency-domain resources with specific bandwidth and subcarrier spacing for PRS and SRS, allowing for simultaneous positioning measurements and transmissions across non-overlapping frequency resources, with explicit or implicit associations, and transitioning between resources to optimize measurement periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement gaps are used for positioning measurements, then positioning accuracy is improved, but spectral efficiency deteriorates due to resource idle time
Solution Approach 1:
The patent combines positioning reference signal (PRS) measurements and sounding reference signal (SRS) transmissions into a single measurement gap period. The UE performs downlink PRS measurements on first frequency-domain resources and simultaneously transmits uplink SRS on second frequency-domain resources during the same measurement gap, thereby utilizing the measurement gap for dual purposes and improving spectral efficiency without compromising positioning accuracy
Solution Approach 2:
The measurement gap is configured to serve multiple functions: it enables positioning measurements (PRS reception), uplink channel sounding (SRS transmission), and potential data transmissions. This multi-functional use of the measurement gap reduces resource idle time and improves overall spectral efficiency while maintaining the positioning accuracy benefit
2Measurement precision
If multiple frequency-domain resources are allocated for PRS and SRS, then positioning and channel sounding accuracy are improved, but device complexity increases
Solution Approach 1:
The patent divides frequency-domain resources into separate first and second frequency-domain resources for PRS and SRS respectively, with each resource configured with specific bandwidth and subcarrier spacing parameters. This segmentation allows independent optimization of each resource for its specific function while maintaining manageable complexity through clear separation of purposes
Solution Approach 2:
The patent enables dynamic transition between different frequency-domain resources based on measurement gap configurations and network requirements. The UE can flexibly switch between resources and configurations to optimize performance for different scenarios, reducing the need for permanently maintaining complex multi-resource configurations
3Measurement precision
If measurement periods are extended for accurate positioning measurements, then positioning accuracy is improved, but latency increases
Solution Approach 1:
The patent ensures continuous utilization of measurement gap periods by simultaneously performing downlink PRS measurements and uplink SRS transmissions within the same gap. This continuous dual-directional operation maximizes the utility of each measurement period, achieving accurate positioning measurements without extending the measurement duration and thereby reducing positioning latency
Data Source
AI summary
In an aspect, a BS transmits PRS on a first frequency-domain resource during a measurement period. A UE measures the PRS, and transmits a RS-P (e.g., SRS-P) on a second frequency-domain resource that does not overlap with the first frequency-domain resource in frequency.