RedCap Frequency Stitching for Cross-Slot PRS Measurements
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately measuring and combining positioning reference signals (PRS) across different frequency bands, leading to inefficiencies in 5G-based positioning due to variations in bandwidth and slot configurations.
Innovation Solution
A method and apparatus for a user equipment (UE) to obtain and combine measurements of positioning reference signals (PRS) across contiguous and adjacent slots within a set of physical resource blocks (PRBs) to enhance measurement accuracy and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PRS measurements are performed across the entire bandwidth using all contiguous PRBs, then measurement accuracy is improved, but device complexity and measurement time increase
Solution Approach 1:
The patent divides the entire bandwidth into multiple subsets of contiguous PRBs (first subset, second subset, etc.). The UE performs PRS measurements on each subset separately across adjacent slots, then combines the results. This segmentation reduces the complexity of measuring the entire bandwidth at once while maintaining measurement accuracy through systematic combination of subset measurements.
2Measurement precision
If PRS measurements are performed across the entire bandwidth using all contiguous PRBs, then measurement accuracy is improved, but measurement time increases
Solution Approach 1:
The patent employs periodic measurement across adjacent slots by measuring different PRB subsets in different slots. The UE measures the first subset in one slot, the second subset in an adjacent slot, and combines these periodic measurements. This approach distributes the measurement process over time, reducing the time required to measure the entire bandwidth compared to attempting to measure everything simultaneously.
Solution Approach 2:
The patent performs preliminary measurements on individual PRB subsets before combining them into a complete bandwidth measurement. By measuring each subset separately in advance across adjacent slots and then combining the results, the system reduces the overall measurement time while maintaining accuracy, as each subset measurement can be performed more efficiently than a full-bandwidth measurement.
3Loss of time
If PRS measurements are performed on subsets of PRBs in adjacent slots, then measurement time is reduced, but measurement complexity increases
Solution Approach 1:
The patent merges the measurements obtained from different PRB subsets measured in adjacent slots to form a complete bandwidth measurement. The UE combines the first measurement (from first subset) and second measurement (from second subset) to obtain the final PRS measurement. This merging process integrates multiple partial measurements into a comprehensive result, reducing overall measurement time while managing complexity through systematic combination.
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) obtains a first measurement of a positioning reference signal (PRS) resource in a first subset of contiguous physical resource blocks (PRBs) of a set of contiguous PRBs, wherein the set of contiguous PRBs spans an entire bandwidth of the PRS resource, and wherein the PRS resource is transmitted in each PRB of the set of contiguous PRBs, obtains a second measurement of the PRS resource in a second subset of contiguous PRBs of the set of contiguous PRBs, wherein the first subset of contiguous PRBs and the second subset of contiguous PRBs are in adjacent slots, and combines at least the first measurement and the second measurement to obtain a measurement of the PRS resource.