IoT Device Fast Reconnection via Stored Beacon Channel
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Solution Overview
Problem
IoT devices experience significant latency in reconnecting to a wireless network after waking up from sleep mode, typically exceeding 3 seconds due to full-channel scans and authentication processes.
Innovation Solution
The method involves establishing a first connection with an Access Point (AP), storing network parameters such as SSID and channel, and upon waking up, listening in the stored channel for a Beacon signal. If the SSIDs match, the IoT device establishes a second connection using the stored Pre-Shared Key (PSK) without recalculating it, thereby reducing reconnection time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the IoT device performs a full-channel scan to discover the previously connected AP and calculate PSK to re-authenticate, then the reconnection process is complete and reliable, but the reconnection time exceeds 3 seconds causing poor user experience
Solution Approach 1:
The patent applies preliminary action by storing the PSK and channel information during the initial connection phase (before sleep mode). When the device wakes up, it directly uses these pre-stored values to skip the time-consuming PSK calculation and full-channel scan, reducing reconnection time from over 3 seconds to under 500 milliseconds while maintaining connection reliability through SSID verification.
2Loss of time
If the IoT device stores network parameters including PSK during initial connection, then fast reconnection is enabled, but the device complexity increases due to additional memory storage requirements
Solution Approach 1:
The patent applies local quality by selectively storing only the critical network parameters (SSID, PSK, and channel) in memory during initial connection, rather than storing all possible network configuration data. This targeted storage approach enables fast reconnection while minimizing the increase in device complexity and memory requirements.
3Loss of time
If the IoT device uses stored PSK for fast reconnection, then reconnection speed increases to under 500 ms, but the device must wake up fully from power saving mode to access stored parameters
Solution Approach 1:
The patent applies preliminary action by pre-storing the PSK and channel information in memory during the initial connection phase. When the device needs to reconnect, it wakes up from power-saving mode, retrieves these pre-stored values, and uses them immediately for fast authentication. This approach reduces reconnection time to under 500 milliseconds while minimizing energy consumption by avoiding the need to recalculate PSK or perform full channel scans.
Data Source
AI summary
The present disclosure address systems and methods for fast reconnection of Internet of Things (IoT) devices to a previously connected Access Point (AP). The method may include storing network parameters of the AP, including a service set identifier (SSID) and a channel, in a memory of the IoT device during the first connection, entering a power saving mode to terminate the first connection with the AP, changing from the power saving mode to a wakeup mode, listening in the stored channel while operating in the wakeup mode until a Beacon signal is received or a predetermined time duration has passed, upon receiving the Beacon signal, comparing the stored SSID with an SSID contained in the Beacon signal; and in response to a comparison result that the stored SSID matches with the SSID contained in the Beacon signal, establishing a second connection with the AP based on the Beacon signal.