Wi-Fi Link Sleep and Wake-Up via BLE Intermediary
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Solution Overview
Problem
Existing wireless projection technologies face challenges in efficiently entering a low-power state and quickly resuming operations when a Wi-Fi link is suspended, leading to increased energy consumption and latency in wireless projection services.
Innovation Solution
A Wi-Fi link sleep and wake-up method is implemented using Wi-Fi Direct protocol, where a Group Owner (GO) and Group Client (GC) communicate through beacon frames and Bluetooth Low Energy (BLE) connections to enable timely entry into a low-power state and rapid wake-up, allowing the Wi-Fi link to enter a sleep state based on predefined intervals and conditions, and wake up quickly when the device is reactivated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the Wi-Fi link enters a low-power state to save energy, then power consumption is reduced, but the wake-up latency increases when the device needs to resume operations
Solution Approach 1:
The patent applies preliminary action by establishing a Bluetooth Low Energy (BLE) connection before the Wi-Fi link enters sleep mode. This BLE connection remains active and can quickly trigger the Wi-Fi link to wake up when needed, avoiding the delay of establishing a new connection from scratch. The BLE connection is set up in advance as a fast wake-up mechanism, resolving the contradiction between energy saving and quick resumption.
Solution Approach 2:
The patent uses Bluetooth Low Energy (BLE) as an intermediary between the devices. The BLE connection serves as a mediator that can quickly signal the Wi-Fi link to wake up without requiring the full Wi-Fi protocol stack to be active. This intermediary layer enables fast wake-up triggering while keeping the main Wi-Fi link in low-power state, balancing energy consumption and response time.
2Loss of time
If the Wi-Fi link remains in working state to ensure quick resumption, then wake-up latency is reduced, but power consumption increases
Solution Approach 1:
The patent segments the communication functionality into two parts: a always-on Bluetooth Low Energy (BLE) connection for fast signaling, and a Wi-Fi link that can enter sleep mode. This segmentation allows the system to maintain the essential communication capability through BLE while allowing the power-intensive Wi-Fi link to sleep, achieving both low power consumption and fast wake-up capability.
Solution Approach 2:
The patent implements periodic action by having the Wi-Fi link enter sleep mode after a period of inactivity, while the BLE connection continues to monitor and can trigger wake-up. This periodic sleeping pattern reduces average power consumption while maintaining the ability to quickly resume when needed, balancing energy efficiency and responsiveness.
3Use of energy by moving object
If the Wi-Fi link enters sleep state quickly to save energy, then power consumption is reduced, but the complexity of managing sleep and wake-up states increases
Solution Approach 1:
The patent applies self-service by enabling the Group Owner (GO) to autonomously initiate the Wi-Fi link sleep function based on local conditions (such as screen off or projection suspension), and enabling the Group Client (GC) to autonomously trigger wake-up based on its own conditions (such as screen on). This distributed decision-making reduces the complexity of centralized state management while achieving effective power savings and quick resumption.
Data Source
AI summary
The present disclosure relates to Wi-Fi link sleep and wake-up methods, electronic devices, and systems. In one example method, a first electronic device establishes a Wi-Fi direct link with a second electronic device. The first electronic device is a group owner (GO) of Wi-Fi Direct. The second electronic device is a group client (GC) of Wi-Fi Direct. The second electronic device may send a first request message to the first electronic device to trigger the first electronic device to enable Wi-Fi link sleep. When a wireless projection service is suspended, a Wi-Fi link used for wireless projection enters a low-power state in a timely manner. When the Wi-Fi direct link sleeps, the second electronic device may send a wake-up request message to the first electronic device to trigger the first electronic device to wake up the Wi-Fi link.