RFID Energy Feedback for Adaptive Wireless Power Transfer

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Solution Overview

Problem

Current wireless communication systems face challenges such as signal attenuation and blockage in complex environments, leading to limitations in communication range and efficiency for devices like RFID tags.

Innovation Solution

The implementation of a feedback mechanism where RFID tags provide channel state information (CSI) to the reader, allowing the reader to adjust transmission power or perform beamforming to improve the link budget and extend communication range.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If wireless energy transfer is performed without feedback mechanism, then the system is simpler to implement, but energy transfer efficiency deteriorates due to inability to adjust to channel conditions

Engineering Contradiction:

Improveenergy transfer efficiencyVSAvoidsystem complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent implements a feedback mechanism where the receiver measures the energy state of received signals and sends feedback information back to the transmitter. The transmitter uses this feedback to adjust transmission parameters such as power level and beamforming, thereby optimizing energy transfer efficiency while maintaining manageable system complexity through structured feedback protocols

Inventive Principle:

Principle #23Feedback

2Length of stationary object

If transmission power is increased to overcome signal attenuation, then communication range is extended, but energy consumption increases

Engineering Contradiction:

Improvecommunication rangeVSAvoidenergy consumption

Core Design Contradiction:

Length of stationary objectVSUse of energy by moving object

Solution Approach 1:

The patent employs dynamic adjustment of transmission power based on real-time channel conditions and feedback from the receiver. Instead of using fixed high power to ensure coverage, the system adapts power levels dynamically, using higher power only when and where needed to extend communication range while minimizing overall energy consumption

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes transmission parameters including power level and beamforming characteristics based on feedback about received energy state. This allows the transmitter to optimize the balance between communication range and energy consumption by adjusting parameters rather than always operating at maximum power

Inventive Principle:

Principle #35Parameter changes

3Loss of energy

If feedback mechanism is implemented, then energy transfer efficiency is improved, but signaling overhead increases

Engineering Contradiction:

Improveenergy transfer efficiencyVSAvoidsignaling overhead

Core Design Contradiction:

Loss of energyVSLoss of time

Solution Approach 1:

The patent implements a feedback mechanism where receivers provide energy state information to transmitters, enabling optimized energy transfer. The feedback is selective and targeted, providing just enough information to improve energy efficiency without requiring complete channel state information, thus balancing the benefits of improved energy transfer against the costs of signaling overhead

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12302249B2Wireless energy transfer and feedback

Publication Date: 2025.05.13 QUALCOMM INC

AI summary

Certain aspects of the present disclosure provide a method for wireless communication by a transmitter generally including transmitting a first energy signal to a receiver and receiving, from the receiver, feedback regarding an energy state of the first energy signal as received at the receiver.