PRS Beam Prioritization for Low-Latency UE Positioning
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Solution Overview
Problem
Existing wireless communication systems, particularly in 5G networks, face challenges in efficiently prioritizing and processing positioning reference signals (PRS) for accurate and timely location determination of user equipment (UE), leading to increased energy consumption and latency.
Innovation Solution
A UE is configured to receive assistance data with a schedule of PRS resources, determine processing priorities based on the proximity of beam directions to an expected direction, and measure PRS resources accordingly, prioritizing closer beams for measurement and reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE measures all PRS resources in the schedule, then positioning accuracy is improved, but energy consumption increases and latency increases
Solution Approach 1:
The PRS resources are divided into multiple resource sets, each associated with different transmission/reception points. The UE processes these resource sets in a prioritized manner, segmenting the measurement task into hierarchical levels based on proximity to expected direction
Solution Approach 2:
The UE performs partial measurement by selectively measuring only the most relevant PRS resources (those with highest processing priority) rather than all resources. This partial action achieves sufficient positioning accuracy while reducing energy consumption
2Measurement precision
If the UE measures all PRS resources in the schedule, then positioning accuracy is improved, but latency increases
Solution Approach 1:
The UE determines processing priorities for all PRS resources in advance based on assistance data and expected directions before actual measurement begins. This preliminary prioritization enables the UE to immediately start measuring high-priority resources without delay
Solution Approach 2:
The UE performs measurements on only the most critical PRS resources (those with highest processing priority) within the measurement opportunity window, achieving sufficient positioning accuracy with reduced measurement time and latency
3Measurement precision
If the UE prioritizes processing PRS resources based on beam proximity to expected direction, then positioning accuracy is improved, but processing complexity increases
Solution Approach 1:
The processing priority for each PRS resource is determined in advance using assistance data that includes expected directions and beam direction information. This preliminary calculation of priorities based on directional proximity simplifies the actual measurement phase
Solution Approach 2:
The UE changes the processing parameter from measuring all PRS resources equally to measuring resources based on their processing priority derived from directional proximity. This parameter change optimizes the measurement process while maintaining manageable complexity
Data Source
AI summary
A method of processing PRS resources includes: receiving, at a UE, assistance data including a schedule of a plurality of PRS resources having a plurality of beam directions, each of the plurality of PRS resources corresponding to a respective source location; determining a processing priority of the plurality of PRS resources based on a proximity of each of the plurality of beam directions to a respective expected direction from the respective source location to the UE; and measuring one or more of the plurality of PRS resources based on the processing priority.