Sub-system Power State Recovery Period Notification
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Solution Overview
Problem
Existing techniques for transitioning from a power saving state to an operational state in apparatuses with multiple sub-systems are inefficient due to the notification of a single recovery period, leading to slower recovery times, as they do not account for varying power states and their corresponding recovery periods within sub-systems.
Innovation Solution
The apparatus determines and notifies the main system of specific recovery periods for each power state of the sub-systems, allowing the main system to transition to a power state that minimizes recovery time based on the shortest notified period, enabling faster recovery to the operational state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the sub-system notifies only a single longest recovery period to the main system, then the main system can wait for a guaranteed recovery time, but the recovery period becomes longer than necessary when the sub-system is in power states with shorter recovery periods
Solution Approach 1:
The patent segments the power states into multiple levels (first power state with longer recovery period, second power state with shorter recovery period) and assigns different recovery period notifications to each segment. This allows the system to provide differentiated recovery time information based on the specific power state, enabling the main system to optimize its waiting time accordingly.
Solution Approach 2:
The patent implements dynamic recovery period notification where the sub-system determines and notifies different recovery periods based on the current power state. The recovery period is not fixed but adapts dynamically according to which power state the sub-system is in, allowing optimization of the recovery time based on actual system conditions.
2Use of energy by moving object
If the sub-system enters a power state with shorter recovery period, then power consumption is reduced, but the main system cannot access the sub-system without waiting for the longer notified recovery period
Solution Approach 1:
The sub-system provides feedback to the main system about its current power state and corresponding recovery period. This feedback mechanism allows the main system to adjust its access timing based on the actual recovery period of the sub-system's current power state, rather than always waiting for the maximum recovery period, thus improving access speed while maintaining power savings.
Solution Approach 2:
The patent changes the recovery period parameter dynamically based on the power state. When the sub-system is in a power-saving state with shorter recovery requirements, it notifies a shorter recovery period to the main system. This parameter change enables the main system to access the sub-system more quickly without compromising the power-saving benefits.
Data Source
AI summary
A sub-system determines, based on an input instruction to transition a power state of an information processing apparatus to a power saving state, a power state from a plurality of power states in which the sub-system can operate, and notifies the main system of a recovery period that corresponds to the determined power state and that the sub-system requires to recover from the determined power state. The main system determines, based on the recovery period notified from the sub-system, a power state that the main system transitions to from a plurality of power states in which the main system can operate.