BLE Transceiver Role Switching for Fast Lock Actuation
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Solution Overview
Problem
Bluetooth Low Energy (BLE) communication in access control systems, such as hotel room locks, experiences delays due to inherent limitations in handheld device connection intervals, particularly for iOS devices, which result in longer lock actuation times compared to Android devices.
Innovation Solution
The method involves establishing an initial wireless connection between a handheld device and an access control, switching roles from peripheral to central and vice versa, and maintaining the first connection while establishing a second connection at a maximum transmission rate, allowing the access control to switch to a central role and the handheld device to advertise at a maximum rate, thereby reducing connection times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the access control uses a slow advertisement rate to maximize battery life, then power consumption is reduced, but the connection time increases
Solution Approach 1:
The access control device dynamically switches between two operational modes: a first mode with slow advertisement rate for normal operation to conserve battery, and a second mode with fast advertisement rate for quick connection. The system transitions to the second mode upon detecting a need for rapid connection, thereby adapting its behavior to balance power consumption and connection speed based on real-time requirements
2Reliability
If the handheld device uses a lengthy connection interval as central device, then resource contention is prevented, but the lock actuation time increases
Solution Approach 1:
The patent inverts the traditional Bluetooth connection setup by having the access control device (peripheral) initiate a second connection to the handheld device (central) after the initial connection is established. This role reversal allows the access control to control the connection interval and advertising rate, enabling faster connection establishment while maintaining proper resource management through the dual-connection approach
3Speed
If the access control switches to central role and handheld device advertises at maximum rate, then connection speed is improved, but device complexity increases
Solution Approach 1:
The connection process is segmented into two distinct phases: a first connection with the handheld device as central and access control as peripheral, and a second connection with roles reversed. This segmentation allows each connection to serve a specific purpose - the first for initial pairing and resource management, the second for fast data transfer - thereby reducing the complexity burden on each individual connection while achieving overall high speed
Data Source
AI summary
A method for data transfer includes establishing a first wireless connection between a transceiver and a handheld device, the transceiver initially operating in an peripheral role and the handheld device operating in a central role; switching a role of both the transceiver and the handheld device in response to establishing the first wireless connection, the transceiver module switching from the peripheral role to the central role, and the handheld device from the central role to the peripheral role; and establishing a second wireless connection between the transceiver and the handheld device subsequent to the switching.