Bluetooth Chip Signal Power Threshold Control

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Solution Overview

Problem

Bluetooth devices waste power as they continuously turn on RF receivers and modems during receive slots without determining if a packet is actually being received, leading to unnecessary power consumption due to lack of signal strength judgment.

Innovation Solution

A Bluetooth chip with an antenna and auto gain controller that compares signal power with a threshold within a receive slot to determine if the RF receiver and modem should be turned off, ensuring they only remain on when a valid packet is being received.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the RF receiver and modem are continuously turned on during receive slots, then packet reception reliability is improved, but power consumption increases

Engineering Contradiction:

Improvepacket reception reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies preliminary action by comparing signal power with a threshold during the access code interval (72 microseconds) before the main packet reception. This preliminary signal strength judgment determines whether to continue receiving the packet, preventing unnecessary power consumption while ensuring reliable packet reception when signals are actually present

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback by continuously monitoring signal power during the receive slot and comparing it with a predefined threshold. Based on this feedback, the system dynamically adjusts whether to maintain or terminate packet reception, optimizing the balance between reception reliability and power consumption

Inventive Principle:

Principle #23Feedback

2Reliability

If the RF receiver is turned on for the entire receive slot duration, then complete packet reception is ensured, but unnecessary power is wasted when no packet is present

Engineering Contradiction:

Improvecomplete packet receptionVSAvoidunnecessary power waste

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The system performs preliminary signal detection during the access code interval (72 microseconds) at the beginning of the receive slot. If no valid signal is detected in this preliminary period, the RF receiver is turned off for the remainder of the slot, avoiding unnecessary power waste while maintaining complete packet reception capability when signals are present

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies dynamics by making the RF receiver's operational state dynamic rather than static. The receiver adapts its operation duration based on real-time signal detection results, extending operation only when packets are actually received and terminating early when no packets are present, thus balancing reliability and energy efficiency

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11553422B2Electronic device capable of reducing communication power and bluetooth chip thereof

Publication Date: 2023.01.10 AIROHA TECHNOLOGY CORPORATION

AI summary

There is provided an electronic device having Bluetooth communication function. The electronic device confirms whether the received signal power is larger than a power threshold within an interval of 72 microseconds every time an RF receiver is turned on in the receive slot so as to determine whether to continuously keep the RF receiver being turned on or to turn off the RF receiver to save power.