PDSCH Power Offset Signaling for Accurate UE Power Determination

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Solution Overview

Problem

Existing network power saving techniques that dynamically change PDSCH transmission power do not effectively communicate these changes to user equipment (UE), potentially impacting performance metrics like CSI feedback and precoding.

Innovation Solution

Implementing a dynamic transmission power indication mechanism using DCI formats (e.g., DCI format 2_Z or modified DCI format 1_1) to signal power offset values to UEs, allowing them to adjust PDSCH transmission power based on indicated power offset values.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by stationary object

If the base station reduces PDSCH transmission power to save energy, then network power consumption is reduced, but the UE cannot determine the actual transmission power which degrades performance metrics like CSI feedback and precoding

Engineering Contradiction:

Improvenetwork power consumptionVSAvoidperformance metrics (CSI feedback, precoding)

Core Design Contradiction:

Use of energy by stationary objectVSReliability

Solution Approach 1:

The patent implements a feedback mechanism where the base station sends power offset indications to the UE via DCI messages. This allows the UE to receive real-time feedback about the actual transmission power being used, enabling accurate CSI feedback and precoding calculations while the base station dynamically adjusts power for energy saving.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces power offset values as an intermediary parameter. Instead of directly controlling transmission power, the base station transmits power offset indications that the UE uses to calculate the actual PDSCH transmission power. This intermediary mechanism enables the UE to determine transmission power accurately without requiring direct base station power control.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Use of energy by stationary object

If the base station dynamically changes PDSCH transmission power without notifying the UE, then network power saving is achieved, but the UE lacks timely information leading to performance degradation

Engineering Contradiction:

Improvenetwork power consumptionVSAvoidinformation delay

Core Design Contradiction:

Use of energy by stationary objectVSLoss of time

Solution Approach 1:

The patent applies preliminary action by having the base station pre-configure a set of power offset values and transmit them to the UE before dynamic power changes occur. The UE receives these offset values in advance via RRC signaling, so when the base station later sends a power offset indication through DCI, the UE can immediately calculate the actual transmission power without delay.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements real-time feedback through DCI messages that carry power offset indications. This feedback mechanism ensures the UE receives timely information about power changes, allowing immediate adjustment of CSI feedback and precoding calculations without performance degradation.

Inventive Principle:

Principle #23Feedback

3Ease of operation

If the base station uses fixed PDSCH transmission power, then the UE can easily determine transmission power, but network power consumption increases without optimization

Engineering Contradiction:

ImproveUE determination of transmission powerVSAvoidnetwork power consumption

Core Design Contradiction:

Ease of operationVSUse of energy by stationary object

Solution Approach 1:

The patent implements dynamics by transitioning from fixed PDSCH transmission power to dynamic power adjustment. The base station can now change transmission power based on UE coverage conditions, using DCI messages to indicate power offset values. This dynamic approach maintains ease of operation for the UE while enabling network power saving through adaptive power control.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies parameter changes by modifying the transmission power parameter dynamically. Instead of using a fixed power level, the base station adjusts the power offset parameter based on UE coverage conditions, transmitting these changes via DCI. This allows the system to optimize power consumption while maintaining simple UE operation through standardized signaling mechanisms.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260052482A1Dynamic Transmission Power Indication for PDSCH

Publication Date: 2026.02.19 APPLE INC

AI summary

A user equipment (UE) configured to decode, based on signals received from a base station, a set of power offset values from a base station, decode, based on signals received from the base station, a downlink control information (DCI), the DCI indicating a power offset value from the set of power offset values and determine a transmission power for physical downlink shared channel (PDSCH) to be transmitted by the base station based on at least the power offset value indicated by the DCI.