Wi-Fi Probe Response Control for Dense WLAN Airtime Reduction
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Solution Overview
Problem
The excessive number of probe responses in wireless networks, often due to increased access-point density, number of WLANs, and clients, leads to significant airtime utilization and adversely affects network performance.
Innovation Solution
An electronic device probabilistically provides probe responses based on communication-performance metrics, such as RSSI, with predefined minimum and maximum values, to reduce the number of responses and improve network throughput and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If access-point density and number of WLANs increase, then network coverage and connectivity options improve, but the number of probe responses increases drastically leading to increased airtime utilization and reduced network performance
Solution Approach 1:
The patent changes the parameter of probe response transmission from deterministic (always transmit) to probabilistic (transmit with probability p). This probability p is dynamically adjusted based on network conditions such as access-point density, number of active WLANs, and current network load, thereby reducing excessive probe responses in dense deployments while maintaining adequate coverage in sparse areas
Solution Approach 2:
The patent introduces dynamic adaptation of probe response transmission behavior. Instead of a static always-transmit approach, the system continuously monitors network conditions and adjusts the transmission probability accordingly. This dynamic mechanism allows the system to respond to changing network topologies and load conditions in real-time
2Adaptability or versatility
If access-point density increases, then network coverage improves, but airtime utilization increases significantly due to excessive probe responses
Solution Approach 1:
The patent modifies the transmission parameter of probe responses from binary (transmit/don't transmit) to probabilistic (transmit with probability p). This parameter change enables fine-grained control over the number of probe responses in dense networks, reducing airtime consumption while preserving network coverage through selective response transmission based on signal strength and network conditions
3Productivity
If the number of probe responses is reduced, then airtime utilization and network performance improve, but the reliability of client connection may be adversely affected
Solution Approach 1:
The patent implements feedback mechanisms where access points monitor network conditions including the number of active clients, signal strength, and response rates. This feedback information is used to dynamically adjust the probe response transmission probability, ensuring that sufficient responses are sent to maintain connection reliability while avoiding excessive responses that would waste airtime
Solution Approach 2:
The patent uses parameter adjustment based on feedback signals. The transmission probability parameter p is continuously tuned according to observed network behavior, client connection success rates, and airtime utilization metrics, creating a closed-loop system that balances performance and reliability
Data Source
AI summary
An electronic device (such as an access point) is described. This electronic device includes an interface circuit that wirelessly communicates with a second electronic device. During operation, the electronic device may receive, from the interface circuit, a probe request associated with the second electronic device, where the probe request includes an identifier of the second electronic device (such as a media access control or MAC address). In response, the electronic device may probabilistically provide, from the interface circuit, a probe response addressed to the second electronic device, where the probabilistically providing has a probability that is based at least in part on a communication-performance metric associated with the probe request, a predefined minimum value of the communication-performance metric and a predefined maximum value of the communication-performance metric.