Mobile Communication Device Power Mode Switching via USB Signal Detection
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Solution Overview
Problem
Mobile communication devices connected to 3G data cards cannot receive external phone calls while in power-saving mode, leading to increased power consumption and battery drain, as they lack a mechanism to wake up from power-saving modes for incoming calls.
Innovation Solution
A mobile communication device with a control circuit unit, a status change detecting circuit, and an embedded controller that monitors USB signals to switch from power-saving to normal working mode when a 3G data card transitions from standby to working status, enabling the reception of external calls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the mobile communication device enters power-saving mode to reduce power consumption, then power consumption is reduced and battery life is extended, but the device cannot receive external phone calls through the 3G data card
Solution Approach 1:
The embedded controller continuously monitors USB interface signals even when the control circuit unit is in power-saving mode. This preliminary monitoring action enables the system to detect incoming call signals before the control circuit unit wakes up, allowing rapid response to external calls while maintaining power-saving state for extended periods.
Solution Approach 2:
The embedded controller acts as an intermediary between the 3G data card and the control circuit unit. It monitors the USB interface signals generated by the data card and conditionally wakes up the control circuit unit only when necessary (incoming calls), rather than requiring continuous operation. This intermediary role resolves the contradiction by enabling call reception capability while maintaining power-saving operation.
2Reliability
If the mobile communication device maintains normal working mode to ensure it can receive external phone calls, then call reception reliability is maintained, but power consumption increases and battery life decreases
Solution Approach 1:
The system dynamically adjusts its operational state based on incoming signals. The control circuit unit transitions between power-saving mode and normal working mode according to the detection results of the embedded controller. This dynamic state adjustment ensures call reception reliability when needed while minimizing power consumption during idle periods, directly resolving the contradiction between reliability and energy use.
Solution Approach 2:
The embedded controller provides feedback monitoring of USB interface signals from the 3G data card. When specific signal patterns indicating incoming calls are detected, the system receives this feedback and transitions from power-saving mode to normal working mode. This feedback mechanism ensures reliable call reception while allowing the system to remain in low-power state during normal operation, resolving the contradiction effectively.
3Duration of action of moving object
If the device frequently switches between power-saving and normal modes to balance power consumption and call reception, then battery life is extended, but the response time to incoming calls increases
Solution Approach 1:
The embedded controller performs preliminary monitoring of USB interface signals continuously, even when the control circuit unit is in power-saving mode. This preliminary detection capability ensures that incoming call signals are identified immediately, allowing the control circuit unit to wake up and respond without delay. This preliminary action resolves the contradiction by maintaining both long battery life through power-saving mode and fast response time through continuous signal monitoring.
Data Source
AI summary
A mobile communication device includes a control circuit unit, a first interface, a status change detecting circuit, and an embedded controller. The control circuit unit is operated in either a normal working mode or a power-saving mode. The first interface is connected with the data card and the control circuit unit. The status change detecting circuit is connected with the first interface. The embedded controller is connected with the status change detecting circuit and the control circuit unit. If the control circuit unit is operated in the power-saving mode and the data card is switched from a standby status to a working status, the data card generates a status-changing signal to the status change detecting circuit. In response to the status-changing signal, the control circuit unit is controlled to be switched from the power-saving mode to the normal working mode by the embedded controller.