Uplink Power Control Mapping for Beam-Indicated NR Terminals

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Solution Overview

Problem

Future radio communication systems, such as NR of Rel. 17 or later versions, lack appropriate methods for determining parameters related to uplink transmission power control, which can lead to deteriorated communication throughput.

Innovation Solution

A terminal that receives information indicating a mapping between spatial relation information and a path loss reference signal using higher layer signaling, and determines transmission power control based on this mapping.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If UL TCI state and spatial relation information are adopted for beam indication in future radio communication systems, then beam indication capability is improved, but the method for determining UL transmission power control parameters becomes undefined leading to communication throughput deterioration

Engineering Contradiction:

Improvebeam indication capabilityVSAvoidcommunication throughput

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent introduces mapping information as an intermediary element that connects the UL TCI state (beam indication) with the path loss reference signal (power control parameter). This mapping information, provided through higher layer signaling, enables the terminal to determine which path loss reference signal to use based on the indicated spatial relation information, thereby resolving the undefined relationship between beam indication and power control parameters.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent establishes the mapping relationship between UL TCI state and path loss reference signal in advance through higher layer signaling (RRC signaling). This preliminary configuration allows the terminal to properly determine power control parameters when UL TCI state is indicated, preventing throughput deterioration before it occurs.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If mapping information between UL TCI state and path loss reference signal is provided through higher layer signaling, then determination accuracy of power control parameters is improved, but signaling overhead increases

Engineering Contradiction:

Improvedetermination accuracy of power control parametersVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent applies local quality by providing mapping information only where needed - specifically for UL channels that require both beam indication and power control. The mapping is configured selectively for different UL channels (PUCCH, PUSCH, SRS) rather than universally, reducing unnecessary signaling overhead while maintaining determination accuracy where required.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12550072B2Terminal, radio communication method, and base station

Publication Date: 2026.02.10 NTT DOCOMO INC

AI summary

A terminal according to one aspect of the present disclosure includes: a receiving section that receives information indicating mapping between an identifier of spatial relation information and a path loss reference signal by using higher layer signaling; and a control section that determines the path loss reference signal used for transmission power control, based on the indicated identifier of the spatial relation information and the mapping. According to one aspect of the present disclosure, parameters related to UL transmission power control can be appropriately determined.