Wireless AP Keep-Alive Time Adaptation for Power-Constrained Stations
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Solution Overview
Problem
In wireless networks, access points disconnect stations (STAs) if they do not receive a packet within a fixed keep-alive time period, which can lead to unnecessary power consumption for battery-powered STAs, especially those with small battery capacity, as they need to wake up and send packets to maintain association even without data to send.
Innovation Solution
STAs communicate their power capabilities to the access point (AP) through a BSS Low Power Capability element, allowing the AP to set a keep-alive time period equal to or greater than the STA's Max Idle period, enabling longer power save modes and reducing disconnections for STAs with limited battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AP uses a fixed short keep-alive time period to maintain network association, then the network responsiveness and connection reliability are improved, but the power consumption of battery-powered STAs increases significantly
Solution Approach 1:
The patent applies parameter changes by allowing the keep-alive time period to be dynamically adjusted based on the STA's power capability category. Instead of using a fixed short interval for all STAs, the system modifies the time parameter according to the STA's battery capacity and power constraints, enabling longer intervals for power-constrained devices while maintaining shorter intervals for high-performance stations.
Solution Approach 2:
The patent implements local quality by differentiating treatment for different STA types based on their power capabilities. Power-constrained STAs receive customized keep-alive intervals and buffered delivery mechanisms tailored to their specific energy limitations, while high-performance STAs continue to use standard aggressive polling intervals, ensuring each STA receives appropriate quality of service matched to its capabilities.
2Measurement precision
If the AP uses a fixed short keep-alive time period to ensure connection activity, then the network monitoring accuracy is improved, but the battery life of small battery capacity STAs deteriorates
Solution Approach 1:
The system changes the keep-alive time period parameter based on the STA's power capability category. For power-constrained STAs, the interval is extended beyond the standard fixed period, allowing them to remain in sleep mode longer while still maintaining network association. This parameter adaptation directly extends battery life while preserving adequate network monitoring through buffered delivery mechanisms.
Solution Approach 2:
The patent introduces dynamics by making the keep-alive mechanism adaptive rather than static. The system dynamically adjusts monitoring intervals and packet delivery timing based on the STA's power capability category, allowing flexible accommodation of both power-constrained and high-performance devices within the same network infrastructure.
3Stability of the object's composition
If the AP requires STAs to send packets frequently to maintain association, then the network connection stability is improved, but the power save mode effectiveness deteriorates
Solution Approach 1:
The patent applies local quality by implementing differentiated connection maintenance strategies for different STA power capability categories. Power-constrained STAs benefit from buffered delivery mechanisms and extended keep-alive intervals that allow them to maintain stable associations without frequent wake-ups, while high-performance STAs continue to use aggressive polling for maximum connection stability.
Solution Approach 2:
The system introduces an intermediary mechanism through buffered packet delivery at the AP. Instead of requiring frequent STA wake-ups for keep-alive packets, the AP buffers incoming packets and delivers them during scheduled STA wake windows, acting as an intermediary that maintains connection stability without forcing frequent STA activity.
4Device complexity
If the AP uses uniform keep-alive settings for all STAs, then the system simplicity is maintained, but the adaptability to different power capabilities deteriorates
Solution Approach 1:
The patent implements local quality by creating distinct service configurations for different STA power capability categories. The system maintains simplicity through clear categorization (power-constrained vs. high-performance) while providing locally optimized parameters for each category, including differentiated keep-alive intervals and buffered delivery settings tailored to specific power constraints.
Solution Approach 2:
The system applies parameter changes by establishing category-specific configurations for keep-alive time periods and packet delivery mechanisms. Instead of complex per-device customization, the approach uses parameter sets matched to power capability categories, achieving adaptability through structured parameter variation while preserving system manageability.
Data Source
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AI summary
In a wireless network, information regarding the power capabilities of a wireless device may be communicated to a wireless AP. The device itself may transmit such information, which may include a Max Idle Time period. The device may communicate the information within an association or re-association frame, for example as a parameter in a BSS Low Power Capability element. The AP may receive the information and set a keep-alive time period for the device based on the information. The AP may set the keep-alive time period to be equal to or greater than the Max Idle period. The AP may further communicate the keep-alive time period to the device, for example in an association or re-association response frame as a BSS Max Idle period element. In this way, the AP may apply different sets of parameters, such as different keep-alive time periods, to different classes of stations.