Serving Cell Power Reallocation for Massive MIMO Coverage

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Solution Overview

Problem

The challenge of improving signal coverage in FDD massive MIMO systems is limited by the cost and performance constraints of active antenna units (AAUs), preventing continuous power increases to enhance coverage, especially in scenarios with large inter-site distances and increased user loads.

Innovation Solution

A power adjustment method involving a serving cell that sends a message to configure a center bandwidth for measurement, reduces power in a second bandwidth, and increases power in the center bandwidth, specifically for cell-specific reference signals, to enhance signal coverage without exceeding AAU power limits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If power of active antenna units is increased to improve coverage, then signal coverage is improved, but device cost and power consumption increase

Engineering Contradiction:

Improvesignal coverage areaVSAvoidAAU power consumption

Core Design Contradiction:

Area of stationary objectVSUse of energy by stationary object

Solution Approach 1:

The patent applies local quality by differentiating power allocation across different frequency bands. Instead of uniformly increasing power across the entire bandwidth, the system identifies and concentrates power in the center bandwidth where measurement signals are transmitted, while reducing or maintaining lower power in edge bandwidths. This localized power enhancement improves coverage for critical measurement purposes without proportionally increasing overall power consumption.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements parameter changes by dynamically adjusting power allocation parameters across different bandwidth portions. The system changes the power parameter from a uniform value to a differentiated value structure, where center bandwidth receives higher power allocation than edge bandwidths. This parameter transformation enables coverage improvement in critical areas while controlling total power consumption through optimized distribution.

Inventive Principle:

Principle #35Parameter changes

2Area of stationary object

If power of active antenna units is continuously increased to improve coverage, then coverage area expands, but device performance limits are reached

Engineering Contradiction:

Improvecoverage areaVSAvoiddevice performance stability

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The patent resolves the performance limit contradiction by applying local quality - concentrating power enhancement efforts on specific critical functions (measurement signals in center bandwidth) rather than attempting to uniformly boost all transmissions. This localized approach improves coverage effectiveness for network measurement and handover decisions without pushing the overall device beyond its performance stability limits.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent applies partial action by focusing power enhancement only on the center bandwidth used for measurement signals, rather than excessively increasing power across the entire frequency spectrum. This partial enhancement is sufficient to improve coverage for critical measurement purposes while avoiding the performance instability that would result from excessive overall power increases.

Inventive Principle:

Principle #16Partial or excessive action

3Measurement precision

If power is concentrated in center bandwidth for measurement signals, then measurement signal strength increases, but total power budget is constrained

Engineering Contradiction:

Improvechannel quality measurement accuracyVSAvoidtotal power consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by stationary object

Solution Approach 1:

The patent directly applies local quality by concentrating power in the center bandwidth where measurement signals are transmitted. This localized power enhancement improves the strength and accuracy of measurement signals (RSRP, RSRQ, CQI) without requiring a proportional increase in total power budget, as power in edge bandwidths is reduced or maintained at lower levels.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements partial action by applying power enhancement only to the specific frequency region (center bandwidth) where measurement signals operate. This partial enhancement provides sufficient measurement precision improvement without the need to excessively increase total power consumption across all bandwidths, achieving cost-effective measurement accuracy improvement.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12550077B2Power adjustment method and device thereof

Publication Date: 2026.02.10 HUAWEI TECH CO LTD

AI summary

The disclosure provides a power adjustment method and apparatus for adjusting power of a serving cell. The serving cell sends a first message to a first terminal to indicates to configure a first measurement bandwidth as a center bandwidth, where a frequency range of the center bandwidth is less than a frequency range of a full bandwidth, the full bandwidth represents a maximum bandwidth allocated to the serving cell, and the first measurement bandwidth is used by the first terminal to measure channel quality; the serving cell reduces power in a second bandwidth, where a frequency range of the second bandwidth is a frequency range obtained by subtracting the frequency range of the center bandwidth from the frequency range of the full bandwidth; and the serving cell increases power in the center bandwidth. The increase of the power in the center bandwidth can increase a coverage of the serving cell.