Downlink PRS Symbol Duration for Low-Latency UE Positioning

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The existing 5G wireless communication systems face challenges in efficiently calculating and buffering Positioning Reference Signal (PRS) symbol durations for accurate UE positioning, particularly in scenarios with varying PRS occasions and repetitions, which affect measurement accuracy and latency.

Innovation Solution

The solution involves determining the PRS symbol duration based on the largest interval that contains potential PRS symbols within a slot, ensuring proper alignment and buffering to meet accuracy requirements, even in complex network configurations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If PRS symbol duration is calculated based on the largest interval containing potential PRS symbols, then measurement accuracy is improved, but buffering time and processing latency increase

Engineering Contradiction:

ImprovePRS measurement accuracyVSAvoidPRS buffering latency

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent calculates and determines the PRS symbol duration in advance based on the largest interval that contains potential PRS symbols from all TRPs. This preliminary determination of buffering requirements allows the UE to prepare appropriate buffer sizes before actual PRS measurements occur, ensuring accuracy requirements are met while optimizing the buffer configuration to minimize unnecessary latency.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If PRS buffering is optimized for accuracy requirements, then positioning precision is improved, but device complexity increases

Engineering Contradiction:

Improvepositioning accuracyVSAvoidPRS processing complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the PRS measurement process into distinct components: determining the largest interval containing potential PRS symbols, calculating the required buffer size based on this interval, and applying this buffer configuration to the PRS processing. This segmentation of the calculation process into manageable steps simplifies the overall device complexity while maintaining positioning accuracy.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the key parameter from arbitrary or fixed buffer sizes to dynamically calculated buffer sizes based on the largest interval containing potential PRS symbols. This parameter change optimizes the buffering configuration to match actual measurement requirements, improving positioning accuracy without unnecessarily increasing device complexity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4136899B1Calculation of downlink positioning reference signal (PRS) symbol duration for PRS buffering purposes

Publication Date: 2025.11.12 QUALCOMM INC

Figure 1
Figure 2A
Figure 2B

AI summary

Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) receives at least one positioning reference signal (PRS) resource from a reference transmission-reception point (TRP) and one or more neighboring TRPs, and processes the at least one PRS resource during a time window, wherein a length of the time window is less than or equal to an integer number of orthogonal frequency division multiplexing (OFDM) symbols of the at least one PRS resource that the UE is capable of processing, buffering, or both within the time window.