TCI-Specific Virtual Power Headroom Reporting Across Multiple TRPs

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Solution Overview

Problem

Existing wireless communication systems face challenges in accurately calculating power headroom in multiple transmission reception point (mTRP) scenarios due to the use of a single set of power control parameters, leading to increased latency and reduced flexibility in power headroom calculations.

Innovation Solution

A user equipment (UE) is configured with separate sets of power control parameters for each transmission reception point (TRP), allowing it to generate distinct power headroom reports (PHRs) for both scheduled and non-scheduled uplink transmissions, associated with respective transmission configuration indicators (TCI) states.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a single set of power control parameters is used for all TRPs, then the device complexity is reduced, but the measurement precision of power headroom calculation deteriorates

Engineering Contradiction:

Improvepower headroom calculation accuracyVSAvoidpower control parameters configuration

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent divides the power control parameters into separate sets for each TRP (first set for first TRP, second set for second TRP). Each set includes TRP-specific parameters such as path loss reference signal parameters, nominal power parameters, alpha values, and P-MPR parameters. This segmentation enables accurate power headroom calculation for each TRP independently, resolving the contradiction between measurement precision and device complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by making each TRP have its own dedicated power control parameters tailored to its specific characteristics. The first set of parameters is optimized for the first TRP's path loss conditions, while the second set is optimized for the second TRP. This localized parameter configuration improves measurement precision for each TRP's power headroom calculation.

Inventive Principle:

Principle #3Local quality

2Measurement precision

If separate sets of power control parameters are configured for each TRP, then the measurement precision of power headroom calculation is improved, but the device complexity increases

Engineering Contradiction:

Improvepower headroom calculation accuracyVSAvoidpower control parameters configuration

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the power control parameters into distinct sets (first set for first TRP, second set for second TRP) with TRP-specific characteristics. This segmentation enables precise power headroom calculation for each TRP while managing complexity through structured organization of parameters.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements a universal framework where multiple sets of power control parameters can be configured following the same structure and methodology. The second set of parameters for virtual PHR follows the same pattern as the first set, allowing for scalable configuration across multiple TRPs without proportionally increasing complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If virtual PHR is supported with separate power control parameters, then the adaptability of the system is improved, but the device complexity increases

Engineering Contradiction:

Improvevirtual PHR capabilityVSAvoidparameter set management

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments power control parameters into separate sets for different TRPs, with the second set specifically configured for virtual PHR calculations. This segmentation enables the UE to independently calculate power headroom for both scheduled and non-scheduled uplink transmissions, improving adaptability to various transmission scenarios.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent utilizes parameter changes by configuring different power control parameters (second set with virtual PHR association) for different transmission scenarios. The UE can switch between using the first set of parameters for scheduled transmissions and the second set for virtual PHR calculations, enhancing system adaptability through parameter variation.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250227628A1Transmission configuration indication-specific virtual power headroom reporting

Publication Date: 2025.07.10 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a message indicating first and second sets of power control parameters associated with a first transmission reception point (TRP) and a second TRP. The UE may generate a first power headroom report (PHR) for a first uplink transmission associated with a first reference signal resource index using the first set of parameters, the first reference signal an actual transmission or a reference (e.g., virtual) transmission, and a second PHR for a reference uplink transmission associated with a second reference signal resource index using the second set of parameters. The second PHR may be a virtual PHR because of the reference uplink transmission, and the first PHR may be a virtual PHR if the first uplink transmission is a reference uplink transmission. The UE may transmit a message including the first and second PHRs.