PTRS Port Configuration for Multi-Codeword Uplink Phase Tracking

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Solution Overview

Problem

Existing wireless communication technologies face challenges in efficiently utilizing multiple antenna port groups for uplink transmission, particularly in improving throughput and managing phase noise in millimeter wave communications.

Innovation Solution

The method involves determining an association between multiple phase tracking reference signal (PTRS) ports and multiple codewords for uplink communication using multiple antenna port groups, with the base station transmitting downlink control information (DCI) to facilitate this association, and the user equipment (UE) configuring PTRS ports based on these parameters for improved uplink transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple antenna port groups are used for uplink transmission, then uplink throughput is improved, but phase noise management becomes more complex

Engineering Contradiction:

Improveuplink throughputVSAvoidphase noise management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the uplink transmission by associating each codeword with a specific antenna port group and configuring dedicated PTRS ports for each codeword-port group combination. This segmentation allows independent phase noise tracking for each stream, managing complexity through modular organization rather than holistic handling of all antenna ports simultaneously.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The base station performs preliminary configuration by determining the association between PTRS ports and codewords before uplink transmission begins. The DCI message pre-configures the PTRS port indices and associated parameters, enabling the UE to establish proper phase noise tracking relationships in advance, avoiding complex real-time decisions during transmission.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If PTRS ports are configured for multiple codewords, then phase noise tracking accuracy is improved, but signaling overhead increases

Engineering Contradiction:

Improvephase noise tracking accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent applies local quality by configuring PTRS resources specifically where needed - only for codewords that require phase noise tracking and only with the precision necessary for each specific codeword-port group association. This avoids uniform over-provisioning of PTRS resources across all transmissions, reducing overall signaling overhead while maintaining tracking accuracy where required.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system dynamically changes PTRS parameters (such as port indices, density, and power) based on the specific transmission conditions, codeword configurations, and channel characteristics. This adaptive parameter adjustment optimizes phase noise tracking accuracy for each transmission scenario while minimizing unnecessary signaling overhead by only adjusting parameters when actually needed.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12483304B2Configuration for phase tracking reference signal ports to enable uplink transmission with multiple codewords

Publication Date: 2025.11.25 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may determine an association between multiple phase tracking reference signal (PTRS) ports and multiple codewords that are to be used for an uplink communication that uses multiple antenna port groups, and transmit the uplink communication using the multiple codewords based at least in part on the association. Numerous other aspects are provided.