PT-RS Density Configuration for Phase Tracking During Repetition

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Solution Overview

Problem

Existing wireless communication systems, particularly in high-frequency bands like FR2, face challenges in phase tracking due to phase noise, which affects transmission quality and efficiency, and there is a need for improved phase tracking reference signal (PT-RS) configurations to enhance coverage and latency.

Innovation Solution

The method involves determining the time and frequency density of PT-RS based on inter-slot repetition of transmissions, optimizing PT-RS configuration for better phase tracking, especially in high-frequency bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If PT-RS density is increased to improve phase tracking accuracy, then phase tracking accuracy is improved, but signaling overhead increases

Engineering Contradiction:

Improvephase tracking accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent implements dynamic adjustment of PT-RS time and frequency density based on transmission conditions. When inter-slot repetition is detected, the system automatically modifies PT-RS density parameters to balance phase tracking accuracy with overhead reduction, making the system adaptive rather than static

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes PT-RS configuration parameters (time density and frequency density) based on detected transmission repetition patterns. By modifying these parameters dynamically, the system optimizes phase tracking performance while controlling overhead, directly addressing the contradiction between measurement precision and quantity of signaling

Inventive Principle:

Principle #35Parameter changes

2Reliability

If transmission repetitions are used to improve coverage, then coverage is improved, but latency increases

Engineering Contradiction:

ImprovecoverageVSAvoidlatency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies partial action by selectively applying PT-RS density adjustments only when inter-slot repetition is detected, rather than applying fixed dense PT-RS configurations always. This partial adjustment approach maintains coverage reliability while minimizing unnecessary overhead and latency

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system performs preliminary detection of inter-slot repetition patterns and pre-adjusts PT-RS density before actual phase tracking operations. This preliminary action allows the system to prepare optimal configurations in advance, reducing processing delays and latency

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12407467B2Phase tracking reference signal configuration for transmission repetitions

Publication Date: 2025.09.02 QUALCOMM INC

AI summary

An apparatus receives a configuration for a phase tracking reference signal (PT-RS). The apparatus then determines at least one of a time density or a frequency density for the PT-RS based on inter-slot repetition of a transmission. The apparatus then receives or transmits the PT-RS based on the at least one of the time density or the frequency density determined based on the inter-slot repetition of the transmission.