Dual-mode Wireless Device Power Management via Cellular Triggered WiFi Activation
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Solution Overview
Problem
Wireless devices face power consumption issues due to continuous searching for WiFi access points in areas where WiFi is not available, leading to reduced battery life, as they typically maintain high-power transceivers on for extended periods, even when not needed.
Innovation Solution
A dual-mode wireless device with a first transceiver for cellular communication and a second transceiver for WiFi, utilizing a control logic system that switches the WiFi transceiver into a power save state when a cellular network detects availability of a WiFi network, allowing the device to switch to WiFi only when necessary, using RFID or Zigbee signals to determine proximity and initiate communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the WiFi transceiver is kept on continuously to enable quick connection, then response time is improved, but power consumption increases
Solution Approach 1:
The system uses periodic beacon signals from the WiFi access point to trigger connection attempts only when needed, rather than maintaining continuous WiFi transceiver operation. The cellular network periodically checks for WiFi availability and activates the WiFi transceiver only when a beacon is detected, converting continuous operation into periodic action to reduce power consumption while maintaining responsiveness.
Solution Approach 2:
The system performs preliminary detection of WiFi beacon signals before initiating full connection procedures. The cellular network first detects the presence of WiFi access points using low-power methods, and only then activates the WiFi transceiver for actual communication, performing the connection preparation in advance to reduce response time when WiFi is available.
2Area of stationary object
If the WiFi transceiver operates at high power to extend coverage area, then coverage is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the operational state of the WiFi transceiver based on real-time conditions. Instead of maintaining fixed high-power operation for maximum coverage, the transceiver switches between off, periodic monitoring, and active communication states based on WiFi availability detection, creating a dynamic power management strategy that adapts coverage needs to actual conditions.
3Reliability
If the device continuously searches for WiFi access points, then network availability detection is improved, but power consumption increases
Solution Approach 1:
The system introduces the cellular network as an intermediary to perform WiFi availability detection. Instead of the device's WiFi transceiver continuously searching for access points (which consumes high power), the cellular network acts as a mediator that detects WiFi beacons and notifies the device only when WiFi is available, significantly reducing the device's power consumption while maintaining reliable detection.
Solution Approach 2:
The system replaces the mechanical/physical continuous scanning operation of the WiFi transceiver with a signal-based detection method using the cellular network. The cellular network receives and processes WiFi beacon signals, substituting the need for continuous active WiFi transceiver operation with a passive signal reception approach that consumes much less power.
Data Source
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AI summary
An apparatus is described that includes a wireless transceiver configured to communicate employing a first network technology, an interface operable to receive a first signal indicating when a wireless device is within a predetermined area and control logic coupled to the wireless transceiver and the interface. The control logic is configured to send a second signal to the wireless device to begin communicating using the second wireless technology via the wireless transceiver responsive to the first signal. There is also described herein a wireless device for inter-operation with the network apparatus described above.