Base Station Transmission Power Control for Coverage Balance

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Solution Overview

Problem

In radio communication systems, transmission power control methods are insufficient when base stations are non-uniformly disposed or in different environments, leading to uneven cell sizes and congestion as terminal stations concentrate on base stations with the highest reception power.

Innovation Solution

A communication control method that sets each base station's transmission power to a maximum, calculates the percentage of individual coverage areas, and adjusts powers to ensure the maximum percentage deviation from the average is within a predetermined value, thereby equalizing coverage areas and preventing terminal station concentration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If transmission power of base stations is increased to expand coverage area, then coverage area is improved, but radio wave interference between cells increases

Engineering Contradiction:

Improvecoverage areaVSAvoidradio wave interference

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The patent dynamically adjusts transmission power parameters of base stations based on real-time measurement of coverage area and interference levels. The control unit modifies power levels to achieve optimal balance between coverage expansion and interference reduction, resolving the contradiction between these two parameters.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements a feedback mechanism where base stations transmit measurement information about coverage and interference to the control unit. The control unit uses this feedback to adjust transmission powers, creating a closed-loop system that automatically balances coverage and interference.

Inventive Principle:

Principle #23Feedback

2Reliability

If transmission power control is performed to ensure given reception power in entire coverage area, then reception power is improved, but cell sizes become uneven when base stations are non-uniformly disposed

Engineering Contradiction:

Improvereception powerVSAvoidcell size uniformity

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The patent applies different transmission power control strategies to different base stations based on their specific locations and coverage characteristics. Each base station's power is adjusted individually to achieve uniform cell sizes while maintaining reliable reception power, accounting for local variations in base station distribution.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent dynamically adjusts transmission powers based on real-time measurement of coverage areas and reception powers. The control unit continuously modifies power levels to maintain uniform cell sizes and reliable reception, adapting to changing conditions in the radio communication environment.

Inventive Principle:

Principle #15Dynamics

3Reliability

If terminal stations connect to base station with highest reception power, then reception quality is improved, but connection concentration causes system congestion

Engineering Contradiction:

Improvereception qualityVSAvoidsystem congestion

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent adjusts transmission powers to create more uniform reception quality across multiple base stations. By equalizing the reception power differences between base stations, the system prevents terminal stations from concentrating connections on single base stations, thereby reducing system congestion while maintaining good reception quality.

Inventive Principle:

Principle #12Equipotentiality

Solution Approach 2:

The patent dynamically changes transmission power parameters to distribute terminal station connections more evenly across the network. The control unit adjusts power levels to prevent connection concentration, balancing reception quality with system load distribution.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12082120B2Communication control method, control station, and communication control program

Publication Date: 2024.09.03 NIPPON TELEGRAPH & TELEPHONE CORP

AI summary

A communication control method for controlling transmission powers transmitted by a plurality of base stations in a coverage area, the coverage area being covered by the plurality of base stations includes setting a transmission power of each base station to a maximum, calculating, for each base station, a percentage of an individual coverage area with respect to the coverage area when the transmission power of each base station is set to the maximum, the individual coverage area serving as a range in which each base station individually accommodates a terminal station, reducing, when a maximum value of the calculated percentages deviates from an average value by a predetermined value or greater, the transmission power of any of the plurality of base stations with the maximum percentage value, newly calculating, for each base station, a percentage of the individual coverage area with respect to the coverage area, and continuing the control until the maximum value of the calculated percentages deviates from the average value by less than the predetermined value.