Sidelink PRS Resource Combining via QCL Signaling
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Solution Overview
Problem
Current mobile wireless communication systems face challenges in accurately combining sidelink positioning reference signal (PRS) measurements across different resources due to uncertainties about whether measurements are taken using the same antennas or beams, leading to potential measurement errors.
Innovation Solution
The proposed method involves signaling from a transmitting user equipment (UE) to a receiving UE to indicate which sidelink PRS resources can be combined, using combining flags, time windows, or quasi-co-location-like information to ensure coherent averaging of measurements, thereby improving positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sidelink PRS measurements are combined across different resources, then positioning accuracy is improved, but measurement reliability deteriorates due to uncertainties about antenna and beam consistency
Solution Approach 1:
The transmitting UE performs preliminary actions by indicating in advance which SL PRS resources are combinable and providing QCL information before the receiving UE performs measurements. This allows the receiving UE to pre-determine which resources can be combined, ensuring measurement reliability while enabling accuracy improvement through combining.
Solution Approach 2:
QCL (quasi-co-location) information acts as an intermediary that bridges the gap between different SL PRS resources. By providing QCL information, the patent enables the receiving UE to determine whether measurements from different resources can be reliably combined, thus resolving the contradiction between combining benefits and reliability concerns.
2Measurement precision
If multiple SL PRS resources are combined for positioning measurement, then positioning performance is enhanced, but system complexity increases due to resource management and indication signaling
Solution Approach 1:
The patent segments the SL PRS resources by introducing combinable indications and QCL information for specific resource groups. Instead of managing all resources uniformly, the system divides them into combinable and non-combinable groups, simplifying the management complexity while enabling performance enhancement through selective combining.
Solution Approach 2:
The patent changes key parameters by introducing new signaling elements (combinable indications, QCL information) that transform the resource management approach. These parameter changes enable automated determination of combinable resources, reducing manual configuration complexity while improving positioning performance through coherent combining.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for combining SL PRS measurements across SL PRS resources. One method may include receiving, from a user equipment, at least one indication indicating at least one sidelink positioning reference signal resource that is combinable; determining, based on the at least one indication, a plurality of combinable sidelink positioning reference signal resources; performing at least one sidelink positioning measurement utilizing the plurality of combinable sidelink positioning reference signal resources; and transmitting, to the user equipment, a report comprising the at least one sidelink positioning measurement and at least one of the following: at least one used sidelink positioning reference signal resource indication or at least one slot index associated with the sidelink positioning measurement.