Sidelink PT-RS Sequence Determination for Demodulation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current wireless communication technologies face challenges in efficiently determining and managing sidelink phase-tracking reference signals (PT-RS) in user equipment, particularly in high-speed and high-node density environments, which affects channel demodulation performance.

Innovation Solution

A method for user equipment to determine a sidelink PT-RS sequence and its time-domain mapping, using configuration information and demodulation reference signals to ensure consistent generation of sidelink PT-RS, reducing complexity and improving demodulation performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If sidelink PT-RS is introduced to track phase noise on higher frequency bands, then demodulation performance is improved, but device complexity increases due to additional signal processing requirements

Engineering Contradiction:

Improvedemodulation performanceVSAvoidsignal processing complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by systematically varying PT-RS configuration parameters including time-domain density (how frequently PT-RS appears in time), frequency-domain density (subcarrier spacing), and port mapping patterns. These parameter adjustments optimize phase tracking performance while controlling processing complexity through configurable density levels.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements dynamic adaptation through UE-specific PT-RS configuration where the receiving UE determines PT-RS parameters based on received signaling and channel conditions. The system dynamically adjusts PT-RS presence and density according to modulation scheme, carrier frequency, and channel quality, allowing flexible optimization between performance and complexity.

Inventive Principle:

Principle #15Dynamics

2Measurement precision

If PT-RS density is increased to improve phase tracking accuracy in high-speed scenarios, then measurement precision improves, but use of energy increases due to more reference signals being transmitted and processed

Engineering Contradiction:

Improvephase tracking accuracyVSAvoidenergy consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent applies partial action by transmitting PT-RS only at selected time-frequency positions rather than continuously across all resources. The time-domain density parameter controls the fraction of symbols containing PT-RS, and frequency-domain spacing determines subcarrier density, enabling energy-efficient partial sampling that maintains adequate phase tracking accuracy.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent implements periodic PT-RS transmission patterns where reference signals appear at regular intervals in time and frequency domains. This periodic structure allows the receiver to track phase noise through sampled measurements rather than continuous signaling, reducing energy consumption while maintaining tracking capability for phase noise variations.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS20230379121A1Method performed by user equipment, and user equipment

Publication Date: 2023.11.23 SHARP KK

AI summary

Provided in the present invention are a method performed by user equipment, and user equipment. The method includes: receiving a PSCCH and a corresponding PSSCH of the PSCCH transmitted by another sidelink user equipment; and determining a sidelink phase-tracking reference signal (PT-RS) sequence.