Communication Device Retry Timing for Electronic Lock Access
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Solution Overview
Problem
When multiple electronic keys attempt to connect to a locking/unlocking device simultaneously, their wireless communications collide, preventing the electronic lock from being unlocked.
Innovation Solution
The electronic keys retry a scan for receiving an advertisement signal after a delay time that is different from other keys, based on unique ID codes or random numbers, to avoid collisions and ensure successful connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple electronic keys simultaneously attempt to connect to the locking/unlocking device, then the connection speed and responsiveness are improved, but wireless communication collisions occur and connection reliability deteriorates
Solution Approach 1:
The system performs a preliminary scan to detect the presence of other electronic keys before attempting connection. By identifying multiple keys in advance and assigning different delay times based on their detection order or ID codes, the system prevents communication collisions before they occur, ensuring reliable connection while maintaining quick response
Solution Approach 2:
The system dynamically changes the delay time parameter for each electronic key based on its ID code or detection sequence. This parameter differentiation ensures that multiple keys attempting simultaneous connection use different backoff intervals, eliminating collisions while preserving fast connection establishment
2Device complexity
If electronic keys use fixed delay times for connection retry, then the connection process is simple and deterministic, but collisions still occur when multiple keys have the same delay time
Solution Approach 1:
Each electronic key is assigned a unique local property (ID code or detection order) that determines its specific delay time. This individualization ensures that even though the overall connection process remains simple, each key has a distinct retry timing characteristic, preventing collisions while maintaining system simplicity
Data Source
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AI summary
Object Proposed are a communication device for reliably locking and unlocking an electronic lock even when a plurality of communication devices attempt to simultaneously connect to a locking/unlocking device, a system including the communication device and the locking/unlocking device, and a control program for the communication device. Solution A communication device starts connection to a locking/unlocking device provided near a door of a building when receiving an advertisement signal transmitted from the locking/unlocking device. The communication device is configured to retry a scan for receiving the advertisement signal after a delay time different from a delay time of another communication device connectable to the locking/unlocking device when the communication device determines the connection failed.