Bluetooth LE Advertiser-Initiated Central Connections Without Scanning

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Solution Overview

Problem

In Bluetooth Low Energy (BLE) connections, a device acting as a central device may not have sufficient time to scan for advertisers, leading to delayed or unsuccessful connections, and existing mechanisms do not allow an advertiser to directly become a central device without scanning.

Innovation Solution

A device wanting to act as a central device advertises information associated with a scan or connection window using various Bluetooth LE advertising events, including legacy and extended events, to solicit a directed advertisement or connection from a peer device, thereby reversing the central-peripheral roles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If a device acts as a central device and scans for advertisers, then it can establish connections with peripheral devices, but it does not have enough time to scan and connection establishment is delayed

Engineering Contradiction:

Improveconnection establishment speedVSAvoidtime available for scanning

Core Design Contradiction:

SpeedVSLoss of time

Solution Approach 1:

The patent inverts the traditional Bluetooth LE connection establishment process by enabling an advertiser device to directly become a central device without scanning. Instead of the scanner initiating connection, the advertiser solicits connections by advertising connection parameters, allowing the advertiser to take on the central device role directly. This inversion eliminates the scanning step and enables rapid connection establishment.

Inventive Principle:

Principle #13The other way round (Inversion)

2Adaptability or versatility

If a device follows traditional Bluetooth LE role assignment where scanner becomes central, then the connection protocol is standardized, but the advertiser cannot become central device without scanning

Engineering Contradiction:

Improveflexibility in central-peripheral role assignmentVSAvoidconnection establishment mechanism complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces dynamic role assignment where the advertiser device can transition from advertising mode to central device mode based on connection solicitations. The system dynamically adjusts roles based on real-time connection needs rather than following fixed traditional protocols, enabling flexible central-peripheral assignment.

Inventive Principle:

Principle #15Dynamics

3Reliability

If multiple devices advertise simultaneously, then device discovery capability is improved, but channel congestion increases

Engineering Contradiction:

Improvedevice discovery reliabilityVSAvoidchannel congestion

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent extracts the connection solicitation process from the traditional advertising channel by introducing a dedicated connection solicitation mechanism. This separates connection establishment traffic from general advertising traffic, reducing channel congestion while maintaining device discovery reliability. The advertiser device advertises connection parameters on dedicated channels rather than competing for general advertising slots.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS20250275000A1Efficient procedures to create bluetooth le central connection on an advertiser

Publication Date: 2025.08.28 INFINEON TECHNOLOGIES AMERICAS CORP

AI summary

Disclosed are techniques for a device that wants to be a central device when creating a connection in a communication network such as Bluetooth Low Energy (BLE) to advertise information associated with a connection window to solicit a connection with a scanning peer device. When the scanning peer device receives the information, it may enter a connection as a peripheral device with the advertising device at the advertised connection window, allowing the advertising device to become the central device. Disclosed are also techniques for a device that wants to be a central device to advertise information associated with a scan window of the device to solicit a directed advertisement event from a peer device during the advertised scan window. The peer device initially scans but may advertise during the scan window as advertised to enable the central device to create a connection where the peer device becomes a peripheral device.