Satellite Terminal Uplink Power Control Using C/N0 Feedback

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Solution Overview

Problem

Terminal equipment in satellite communication continuously transmits signals at maximum power, leading to high power consumption.

Innovation Solution

A transmit power adjustment method that involves acquiring the carrier-to-noise spectral density ratio and adjusting uplink signal transmit power based on this ratio, along with dynamic adjustment of receiving antennas to optimize power consumption and communication reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If terminal equipment transmits at maximum power to ensure communication reliability, then communication reliability is improved, but power consumption increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements dynamic transmit power adjustment by continuously monitoring downlink signal quality (C/N0) and adapting uplink transmit power accordingly. The terminal transitions from static maximum power transmission to dynamic power control, adjusting power levels in real-time based on satellite distance, orbital position, and signal conditions to maintain communication reliability while minimizing power consumption.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent establishes a feedback mechanism where the terminal monitors downlink carrier-to-noise spectral density ratio (C/N0) and uses this information to adjust uplink transmit power. The satellite also provides feedback through power control commands, creating a closed-loop system that optimizes power consumption while maintaining communication quality through continuous monitoring and adjustment.

Inventive Principle:

Principle #23Feedback

2Device complexity

If terminal equipment uses linearly polarized antennas to receive circularly polarized signals from satellites, then device complexity is reduced, but polarization loss increases

Engineering Contradiction:

Improveantenna structure complexityVSAvoidpolarization loss

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The patent converts the inherent 3dB polarization loss from using linearly polarized antennas into a compensable parameter through dynamic power adjustment. Instead of attempting to eliminate the polarization loss through complex antenna structures, the system accepts the loss and compensates for it dynamically by adjusting transmit power based on real-time signal quality measurements, transforming a structural disadvantage into a controllable parameter.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentEP4701088A1Transmit power adjustment method, and terminal, storage medium and electronic apparatus

Publication Date: 2026.02.25 ZTE CORP

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AI summary

Provided in the embodiments of the present disclosure are a transmit power adjustment method, and a terminal, a storage medium and an electronic apparatus. The method comprises: acquiring a carrier to noise power spectrum density ratio of a main receiving antenna; and adjusting uplink signal transmit power according to the carrier to noise power spectrum density ratio.