PUSCH Waveform-Specific Power Control for Accurate Headroom Reporting

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Solution Overview

Problem

Existing wireless communication systems face challenges in controlling uplink transmission power and performing power headroom reporting effectively, particularly in scenarios involving different waveforms.

Innovation Solution

A method and apparatus for controlling uplink transmission power and performing power headroom reporting by utilizing first and second power control parameter values based on the transform precoder indicator value within the DCI format, distinguishing between DFT-s-OFDM and CP-OFDM waveforms.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single power control parameter is used for both DFT-s-OFDM and CP-OFDM waveforms, then the system complexity is reduced, but the uplink power transmission control accuracy deteriorates

Engineering Contradiction:

Improvesystem complexityVSAvoidpower transmission control accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent segments the power control parameters into separate sets for different waveforms. Specifically, it configures first power control parameters for DFT-s-OFDM waveform and second power control parameters for CP-OFDM waveform, allowing independent optimization of power control for each waveform type while maintaining overall system manageability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic selection of power control parameters based on the waveform type indicated in the DCI format. The terminal device dynamically switches between using first power control parameters and second power control parameters according to whether the scheduled PUSCH uses DFT-s-OFDM or CP-OFDM waveform, enabling adaptive power control that matches the specific waveform characteristics

Inventive Principle:

Principle #15Dynamics

2Measurement precision

If waveform-specific power control parameters are configured, then the power transmission control accuracy is improved, but the device complexity increases

Engineering Contradiction:

Improvepower transmission control accuracyVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent enables the terminal device to autonomously determine which power control parameters to use based on the waveform type indicated in the DCI format. The device self-manages the selection between first and second power control parameters without requiring additional network coordination, reducing signaling overhead and simplifying the overall system architecture

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent creates a universal power control mechanism that handles multiple waveform types through a unified framework. By configuring multiple sets of power control parameters that can be selectively applied based on waveform type, the system achieves waveform-agnostic power control management while maintaining waveform-specific optimization

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If power control parameters are not waveform-specific, then the configuration simplicity is maintained, but the power headroom reporting accuracy deteriorates

Engineering Contradiction:

Improveconfiguration simplicityVSAvoidpower headroom reporting accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent segments power headroom reporting into waveform-specific instances by associating separate power control parameter sets with different waveforms. This allows the terminal to calculate and report power headroom accurately for each waveform type using its corresponding power control parameters, while the network can independently configure each set without affecting the other

Inventive Principle:

Principle #1Segmentation

4Reliability

If waveform-specific power control is implemented, then the communication reliability is improved, but the signaling overhead increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent merges the waveform type indication and power control parameter selection into a single DCI format. By incorporating the transform precoder indicator that simultaneously indicates both the waveform type and triggers the corresponding power control parameter selection, the system achieves waveform-specific power control without requiring separate signaling messages for each function

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP4668902A1Method, user equipment, processing device, and storage medium for transmitting uplink signal, and method and base station for receiving uplink signal

Publication Date: 2025.12.24 LG ELECTRONICS INC

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AI summary

The UE may: receive a first power control parameter value for a first type waveform and a second power control parameter value for a second type waveform; detect a DCI format for scheduling a PUSCH; determine a waveform for the PUSCH and transmission power for the PUSCH on the basis of a first DCI format; and transmit the PUSCH using the transmission power. Based on that a transform precoder indicator value in the first DCI format has a first value, the transmission power for the PUSCH may be determined on the basis of the first power control parameter value. Based on that the transform precoder indicator value in the first DCI format has a second value, the transmission power for the PUSCH may be determined on the basis of the second power control parameter value.