Dynamic Transmission Power Control for Wi-Fi Channel Occupancy

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Solution Overview

Problem

In communication systems using IEEE 802.11ax, where a frequency channel is divided into multiple frequency bands, the reduced transmission power per unit frequency can lead to radio wave interference and errors when not all frequency bands are utilized by devices.

Innovation Solution

A communication device that includes transmitting means, identifying means, and control means to adjust transmission power based on the occupancy of multiple frequency bands within a frequency channel, ensuring suitable transmission power for the entire frequency channel condition.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If one frequency channel is divided into multiple frequency bands and utilized by different devices simultaneously, then frequency utilization efficiency is improved, but transmission power for the entire frequency channel is reduced leading to radio wave interference

Engineering Contradiction:

Improvefrequency utilization efficiencyVSAvoidtransmission reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies dynamics by making the transmission power adjustable based on the actual number of devices transmitting in the frequency channel. The transmission power is not fixed but dynamically changed according to the transmission occupancy, allowing the system to adapt to varying conditions and maintain reliability while enabling multiple devices to share the channel.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the transmission power parameter based on the transmission occupancy of the frequency channel. When fewer devices are transmitting, the transmission power is increased to maintain signal strength and prevent interference. This parameter adjustment resolves the contradiction by allowing high frequency utilization when needed while maintaining transmission reliability when fewer devices are active.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If transmission power per unit frequency is maintained at the same level as when all frequency bands are used, then transmission reliability is improved, but energy consumption increases unnecessarily

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The transmission power is dynamically adjusted based on the actual number of devices transmitting in the frequency channel. When fewer devices are transmitting, the power is increased to maintain reliability. When more devices are transmitting, the power can be reduced since the channel is already more occupied. This dynamic adjustment eliminates unnecessary energy consumption while maintaining transmission reliability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the transmission power parameter according to the transmission occupancy conditions. By monitoring how many devices are transmitting and adjusting the power level accordingly, the system avoids wasting energy on high power transmission when the channel is already occupied by other devices, thus resolving the contradiction between reliability and energy consumption.

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If transmission power is reduced when not all frequency bands are utilized, then energy consumption is reduced, but radio wave interference occurs and errors are generated

Engineering Contradiction:

Improveenergy consumptionVSAvoidradio wave interference

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent uses feedback by monitoring the transmission occupancy of the frequency channel and using this information to adjust the transmission power. The system receives feedback about how many devices are transmitting and adjusts the power level accordingly, preventing radio wave interference while avoiding unnecessary energy consumption. This feedback mechanism resolves the contradiction by making power adjustment based on actual channel conditions.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The transmission power is made dynamic and adjustable based on the actual transmission conditions. When the channel occupancy is low, power is increased to prevent interference. When occupancy is high, power can be reduced. This dynamic adjustment prevents radio wave interference while maintaining energy efficiency, resolving the contradiction between these two factors.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250071690A1Communication device, information processing device, control method, and program

Publication Date: 2025.02.27 CANON KK

AI summary

A communication device includes transmitting means for transmitting a signal in one or more frequency bands of a frequency channel including a plurality of frequency bands, identifying means for identifying occupancy of the plurality of frequency bands, and control means for controlling transmission power for transmitting the signal from the transmitting means, on the basis of an identification result obtained by the identifying means.