Dynamic Hibernation Cycle Alignment for Wireless Power Savings
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Solution Overview
Problem
Existing communication systems face challenges in optimizing power management for battery-powered devices, particularly in ensuring extended battery life and efficient energy consumption, as fixed duty cycles may not always provide optimal performance in terms of throughput and energy conservation.
Innovation Solution
The system allows devices to dynamically adjust their hibernation and active modes by announcing broadcast traffic during global access periods, synchronizing global and local access periods using equations, and aligning hibernation and active cycles based on neighboring devices' cycle start times, enabling devices to wake up and transmit data during overlapping periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If devices use fixed duty cycles for hibernation and active modes, then power consumption is reduced, but throughput and network efficiency deteriorate
Solution Approach 1:
The patent implements dynamic duty cycle adjustment where devices can change their hibernation and active periods based on network conditions and traffic requirements. Instead of fixed duty cycles, devices dynamically modify their wake-up intervals and active periods to optimize both power consumption and throughput, allowing the system to adapt to varying workload demands while maintaining energy efficiency.
Solution Approach 2:
The system changes operational parameters such as duty cycle percentages, wake-up intervals, and active period durations based on network conditions. By adjusting these parameters dynamically rather than using fixed values, the system can optimize the balance between power consumption and throughput, allowing devices to enter deeper hibernation when traffic is low and wake up more frequently when network activity increases.
2Use of energy by moving object
If devices hibernate for longer periods to extend battery life, then energy savings increase, but wake-up timing and data transmission responsiveness worsen
Solution Approach 1:
The patent implements preliminary action by having devices wake up slightly before their actual data transmission needs based on predicted traffic patterns and scheduled communications. Devices use timing information from beacons and network protocols to anticipate when they need to be active, waking up in advance to ensure readiness for data transmission while still maximizing hibernation periods for energy savings.
Solution Approach 2:
The system uses feedback mechanisms where devices monitor network traffic patterns, beacon information, and communication schedules to dynamically adjust their wake-up timing. By receiving feedback from the network about upcoming traffic and using this information to optimize wake-up times, devices can extend hibernation periods while ensuring they wake up at optimal moments for data transmission, minimizing unnecessary wake-ups.
3Productivity
If devices synchronize wake-up times to reduce idle waiting, then productivity improves, but device complexity and coordination overhead increase
Solution Approach 1:
The patent uses beacons and network protocol messages as intermediaries to coordinate wake-up times between devices. Instead of direct device-to-device synchronization which would be complex, devices rely on centralized or distributed beacon signals that carry timing information and wake-up schedules. This intermediary approach simplifies the synchronization process while maintaining coordination efficiency across the network.
4Productivity
If devices use dynamic duty cycle adjustment, then network efficiency improves, but power management complexity increases
Solution Approach 1:
The patent implements self-service power management where devices autonomously adjust their own duty cycles based on locally observed network conditions, traffic patterns, and power requirements. Each device independently makes power management decisions without requiring complex centralized control, using simple rules and heuristics to dynamically adjust wake-up intervals and active periods, thereby improving network efficiency while keeping individual device complexity manageable.
Data Source
AI summary
According to an embodiment of the invention, a system and method to provide alignment of hibernation and active cycles is provided. When one device receives a beacon from one of its neighbors it can be implemented to check for the neighboring device's global cycle start countdown value and to compare it's global cycle start countdown value with its own. If the beacon from the neighboring device contains a global cycle start countdown value that is different from the device's own global cycle start countdown, the device can be implemented to check a predefined condition. For example, if a device's global cycle start time falls into the first half of a neighbor's global cycle, then the device changes its own global cycle start time to the global cycle start time of that neighbor. In another embodiment, if a device's global cycle start time falls into the first 256/K superframes of a neighbor's global cycle, then the device changes its own global cycle start time to the global cycle start time of that neighbor. In one embodiment, K can be the number of different global active cycle start times observed by the device.