WOL Terminal Power Control via Cancel Signal Monitoring
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Solution Overview
Problem
Information processing terminals resumed from a suspended state via Wake On LAN (WOL) continue to consume power unnecessarily if no user intervention occurs within a predetermined period, leading to increased power consumption.
Innovation Solution
Incorporating a WOL monitoring unit, resume processing unit, factor recording unit, cancel monitoring unit, and suspend processing unit in the CPU to monitor for specific packets and cancel signals, allowing the terminal to switch back to a suspended state when no user interaction is detected after resumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal continues operating for a predetermined period after WOL resumption to allow user response, then user response opportunity is ensured, but power consumption increases unnecessarily when no user is present
Solution Approach 1:
The system monitors whether user response manipulation occurs during the predetermined period after WOL resumption. Based on this feedback, the terminal automatically transitions to suspended state if no response is detected, or remains operational if response is detected. This feedback mechanism resolves the contradiction by adapting the operating state based on actual user presence.
Solution Approach 2:
The terminal dynamically changes its operational state based on detected user response. The system transitions from a fixed predetermined operation period to a flexible state where the terminal can early-transition to suspended mode when no user response is detected, optimizing power consumption while maintaining user accessibility when needed.
2Adaptability or versatility
If the terminal remains in operating state for predetermined period after WOL resumption, then potential user requests can be handled, but power saving is compromised when no user intervention is needed
Solution Approach 1:
The system uses feedback from user response manipulation detection to determine whether to continue operation or transition to suspended state. This feedback-driven approach ensures the terminal handles user requests when present while saving power when no users are interacting with the device.
Solution Approach 2:
The terminal automatically monitors for user responses and self-determines when to transition to suspended state without requiring manual user input or external control. This self-service mechanism optimizes power saving while maintaining adaptability to handle user requests when they occur.
3Extent of automation
If the terminal uses timer processing to manage suspend/resume states, then automated power control is achieved, but the terminal cannot distinguish between WOL resumption and other resumption causes
Solution Approach 1:
The system performs preliminary recording of the resumption cause (WOL packet reception) before the timer processing begins. This preliminary action ensures that when the timer expires or user response is monitored, the system already knows whether the resumption was triggered by WOL or other causes, enabling appropriate power control decisions.
Solution Approach 2:
The invention introduces an intermediary mechanism (resumption cause recording and monitoring) between the WOL resumption event and the timer-based power control. This intermediary preserves the resumption cause information throughout the timer processing, allowing the system to distinguish WOL resumptions from other types and apply appropriate power saving logic.
Data Source
AI summary
An information processing terminal includes a WOL monitoring unit for monitoring whether or not a particular packet for indicating resumption of operation from a suspended state is received, a resume processing unit for resuming the operation from the suspended state, a factor monitoring unit for recording a factor of the resumption to a memory, a cancel monitoring unit for monitoring whether or not a cancel signal to a communication request received after the resumption is received, and a suspend processing unit for switching the operation to the suspended state when the factor of the resumption is reception of the particular packet as well as the cancel signal is received after the resumption. With this arrangement, power consumption of the information processing terminal can be suppressed.