Bluetooth Low Energy Transmit Power Control via RSSI Feedback

Solution Overview

Problem

Bluetooth Low Energy (BLE) connections face challenges in maintaining optimal transmission power levels due to fluctuations in path losses and channel conditions caused by movement, fading, and environmental obstructions.

Innovation Solution

A method for dynamically adjusting the transmit power of a BLE device by determining the received signal strength indication (RSSI) and calculating power adjustments based on filtered RSSI values and standard deviations, allowing for real-time power control to maintain optimal communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If transmit power is increased to maintain communication quality, then signal-to-noise ratio is improved, but power consumption increases

Engineering Contradiction:

Improvecommunication qualityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements dynamic transmit power adjustment where the BLE device continuously monitors RSSI values and adapts its transmit power level in real-time based on channel conditions. The controller adjusts power between different levels (e.g., -20dBm to 0dBm) depending on whether the RSSI falls within an acceptable range, thereby optimizing the balance between communication reliability and power consumption.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system employs a feedback mechanism where the receiving device measures the RSSI of incoming signals and reports this information back to the transmitting device. The transmitting device uses this feedback to determine whether to maintain or adjust its transmit power level, creating a closed-loop control system that optimizes power usage while maintaining communication quality.

Inventive Principle:

Principle #23Feedback

2Use of energy by moving object

If transmit power is decreased to save energy, then power consumption is reduced, but link outages increase

Engineering Contradiction:

Improvepower consumptionVSAvoidlink stability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent implements dynamic transmit power adjustment where the BLE device continuously monitors RSSI values and adapts its transmit power level in real-time based on channel conditions. The controller adjusts power between different levels (e.g., -20dBm to 0dBm) depending on whether the RSSI falls within an acceptable range, thereby optimizing the balance between communication reliability and power consumption.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system employs a feedback mechanism where the receiving device measures the RSSI of incoming signals and reports this information back to the transmitting device. The transmitting device uses this feedback to determine whether to maintain or adjust its transmit power level, creating a closed-loop control system that optimizes power usage while maintaining communication quality.

Inventive Principle:

Principle #23Feedback

3Device complexity

If fixed transmit power is used to simplify control, then device complexity is reduced, but adaptability to changing channel conditions deteriorates

Engineering Contradiction:

Improvepower control complexityVSAvoidchannel condition adaptability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic transmit power adjustment where the BLE device continuously monitors RSSI values and adapts its transmit power level in real-time based on channel conditions. The controller adjusts power between different levels (e.g., -20dBm to 0dBm) depending on whether the RSSI falls within an acceptable range, thereby optimizing the balance between communication reliability and power consumption.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system employs a feedback mechanism where the receiving device measures the RSSI of incoming signals and reports this information back to the transmitting device. The transmitting device uses this feedback to determine whether to maintain or adjust its transmit power level, creating a closed-loop control system that optimizes power usage while maintaining communication quality.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12245163B1Method and system for transmission power control in bluetooth low energy controllers

Publication Date: 2025.03.04 SYNOPSYS INC

AI summary

A method for dynamically adjusting transmit power of a first device that is in communication with a second device using a wireless communications protocol includes, in part, determining, by the second device, a received signal strength indication (RSSI) associated with a signal received from the first device; determining, by the second device, a first amount of power adjustment for the first device in accordance with the determined RSSI; transmitting the first amount of power adjustment from the second device to the first device; determining, by the first device, a second amount of power adjustment for the first device in accordance with the RSSI and the first amount of power adjustment; and changing a transmit power of the first device in accordance with the second amount of power adjustment.