Bluetooth Slave Device Synchronization Without Host Control

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Solution Overview

Problem

Conventional Bluetooth systems require host-side intervention for connection synchronization between slave devices when a slave device changes master devices, necessitating application software and driving procedures.

Innovation Solution

Slave devices communicate directly to synchronize connections by advertising device addresses and replying with scan responses, allowing self-synchronization without host intervention.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If host-side control is used to synchronize Bluetooth connections between slave devices, then connection synchronization can be achieved, but device complexity and software requirements increase

Engineering Contradiction:

Improveconnection synchronizationVSAvoidsoftware complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The slave device autonomously performs connection synchronization by monitoring advertising packets from master devices and automatically updating its connected state without requiring host-side intervention. The slave device independently determines when to switch masters and notifies other slave devices through standard Bluetooth procedures, eliminating the need for complex host software to manage connection synchronization.

Inventive Principle:

Principle #25Self-service

2Reliability

If host-side control is used for connection synchronization, then connection reliability is improved, but the need for application software and driving procedures increases

Engineering Contradiction:

Improveconnection synchronizationVSAvoidsoftware dependency

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The slave device independently monitors advertising packets broadcast by master devices and automatically detects when a master device changes. Upon detecting the change, the slave device autonomously initiates reconnection procedures and notifies other paired slave devices using standard Bluetooth advertising and scanning mechanisms, completely eliminating dependency on host-side application software or driving procedures for connection synchronization.

Inventive Principle:

Principle #25Self-service

3Loss of information

If slave devices communicate through host side, then connection information can be synchronized, but communication efficiency decreases

Engineering Contradiction:

Improveconnection information synchronizationVSAvoidsynchronization time

Core Design Contradiction:

Loss of informationVSLoss of time

Solution Approach 1:

The patent extracts the connection synchronization function from the host device and implements it directly in the slave device. The slave device independently monitors advertising packets from master devices, detects master device changes, and directly communicates with other slave devices through standard Bluetooth procedures, eliminating the intermediate host-side communication step and significantly reducing synchronization time.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS12426104B2Operation method of slave device in Bluetooth system

Publication Date: 2025.09.23 PIXART IMAGING INC

AI summary

There is provided a Bluetooth system including multiple slave devices. When a first slave device among the multiple slave devices changes its connection to a different master device, the first slave device actively informs other slave devices among the multiple slave devices to connect to said different master device to realize the Bluetooth connection synchronization between the multiple slave devices.