Wireless LAN AP Wake-Sleep Scheduling for Power Saving
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Solution Overview
Problem
Existing wireless LAN technologies do not effectively address power-saving techniques for access points (APs), which are crucial for supporting high-throughput and real-time communication demands.
Innovation Solution
The method involves transmitting power-saving information to stations (STAs) and operating the AP in doze and awake states based on this information, with communication occurring only during awake periods, and using frames to manage these states and extend or terminate them as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AP operates continuously in an awake state to maintain communication availability, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic wake-up intervals where the AP alternates between doze and awake states. The AP wakes up at predetermined intervals to perform channel access and communication operations, then returns to doze state. This periodic operation pattern reduces overall power consumption while maintaining communication availability during wake-up periods.
Solution Approach 2:
The patent dynamically adjusts the AP's operational state based on communication requirements. The AP transitions between doze and awake states according to predetermined wake-up intervals and channel access conditions. This dynamic state adjustment allows the system to optimize between power saving and communication reliability adaptively.
2Use of energy by moving object
If the AP enters doze state frequently to save power, then power consumption is reduced, but communication responsiveness deteriorates
Solution Approach 1:
The patent performs preliminary actions during wake-up periods by attempting channel access and preparing communication resources before returning to doze state. The AP uses wake-up intervals to proactively check channel conditions and initiate communication sequences, ensuring that when the AP needs to communicate, it can do so promptly without waiting for extended awake periods.
Solution Approach 2:
The patent maintains continuity of useful communication actions during wake-up intervals. By attempting channel access and performing communication operations during each wake-up period, the AP ensures that communication tasks are持续推进 (continued) over time, balancing power saving with maintained communication responsiveness.
3Productivity
If the AP extends awake periods to handle more communication, then productivity is improved, but power consumption increases
Solution Approach 1:
The patent implements partial awake periods where the AP remains awake only long enough to complete essential communication tasks or channel access attempts. Rather than maintaining extended awake periods, the AP performs necessary communication actions during wake-up intervals and returns to doze state, achieving adequate productivity with minimized power consumption.
Data Source
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AI summary
A method and a device for saving AP power in a wireless LAN are disclosed. This method of an AP comprises the steps of: transmitting a first frame including AP power saving information to one or more STAs; operating in an AP doze state in an AP doze period indicated by the AP power saving information; and operating in an AP awake state in an AP awake period indicated by the AP power saving information.