Peripheral Power Management via Synchronized Shutdown
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Solution Overview
Problem
Mobile devices shutting off can disrupt connections with peripheral devices, leading to battery waste and unavailability of enhanced operations, especially when peripheral devices lack sophisticated shutdown and startup timing interfaces, and secure connection keys may expire during inactive periods.
Innovation Solution
A method where a base device transmits a power management message to a peripheral device specifying periods of reduced operation, allowing both devices to conserve battery power and rapidly reestablish connections upon resuming normal operations, with options for using relative or absolute time based on the peripheral device's capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the base device shuts off during periods of reduced operation to conserve battery power, then battery life is extended, but the connection with the peripheral device is disrupted and reconnection time is increased
Solution Approach 1:
The base device transmits a power management message to the peripheral device before shutting off, specifying the bounds of the period of reduced operation. This preliminary action allows the peripheral device to know when to remain active and ready, enabling rapid reconnection when the base device resumes operation without requiring extensive handshake protocols or connection searches.
Solution Approach 2:
The peripheral device uses the power management message to determine when to enter or remain in a low-power state, and when to wake up and reestablish the connection. This feedback mechanism ensures both devices are synchronized, allowing the peripheral device to be ready exactly when the base device returns, minimizing reconnection time while maximizing battery conservation during the shutdown period.
2Reliability
If the base device and peripheral device remain connected during periods of reduced operation, then connection availability is maintained, but battery power is wasted
Solution Approach 1:
Instead of maintaining continuous connection, the system uses periodic action where the base device shuts off during specified periods of reduced operation and reestablishes connection when needed. The power management message enables the peripheral device to synchronize with these periodic on/off cycles, maintaining connection availability only when necessary while conserving battery power during shutdown periods.
3Device complexity
If the peripheral device lacks sophisticated shutdown and startup timing interfaces, then device complexity is reduced, but coordinated power management becomes difficult
Solution Approach 1:
The power management message acts as an intermediary that carries timing information from the base device to the peripheral device. This message includes bounds of the period of reduced operation, enabling the peripheral device to coordinate its power state without requiring sophisticated shutdown and startup timing interfaces. The message format can be adapted to work with simple peripheral devices while maintaining effective power management coordination.
Data Source
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AI summary
Based on bounds of a period of reduced operation for a base device, a base device generates a power management message for transmission to a peripheral device. In the power management message, the base device inserts bounds of a period of reduced operation for the peripheral device. As a result, the periods of reduced operation conserve battery power in both devices and the two devices may reestablish a communications channel upon reaching the end of the period of reduced operation and resuming normal operations.