Access Point Timer Clears Buffered Probe Responses
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Solution Overview
Problem
In wireless local area networks, active scanning methods result in wasted channel resources because access points continue to send probe response messages to user terminals even after they have left, due to the lack of timing mechanisms to manage message transmission.
Innovation Solution
Implementing a timer at the access point that clears buffered probe response messages after a preset scanning time has elapsed, ensuring that messages are not sent to user terminals that have completed their scan, thereby reducing channel resource overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the access point continuously sends probe response messages to user terminals after they have left, then the user terminal can receive complete responses, but channel resources are wasted
Solution Approach 1:
The access point pre-arranges probe response messages in a transmission queue before the user terminal actually needs them. By preparing responses in advance and organizing them in a ready-to-send queue, the system ensures immediate response delivery when needed while avoiding continuous transmission after the terminal leaves, thus resolving the contradiction between reliability and resource waste
Solution Approach 2:
The system uses a timer mechanism that monitors the scanning time parameter from the probe request message. When the timer expires without receiving a new probe request, the access point stops sending probe response messages. This feedback-based timing mechanism ensures responses are sent only when the terminal is actively scanning, eliminating resource waste while maintaining reliable delivery during the scanning window
2Ease of operation
If the access point arranges probe response messages in a transmission queue and sends them in distributed competition manner, then message transmission is organized, but the user terminal must wait for a fixed period and the access point continues sending after the user has left
Solution Approach 1:
The system dynamically adjusts the probe response transmission behavior based on the timer status. Instead of using a fixed waiting period, the access point continuously monitors whether the timer has expired and whether new probe requests are received. This dynamic approach allows the terminal to receive responses as soon as they are ready without unnecessary waiting, while also stopping transmission promptly when the terminal leaves, thus reducing time loss while maintaining organized transmission
Data Source
AI summary
Embodiments of the present invention provide a feedback method for active scanning of a user terminal and an access point, and relate to the field of communications, where a timer is set in the access point, and after the timer reaches preset time, buffered probe response message can be cleared, thereby further reducing an overhead of channel resources. The feedback method includes: receiving a probe request message from a user terminal, where the probe request message includes scanning time preset by the user terminal; generating and buffering a probe response message of the probe request message; setting and starting a timer corresponding to the user terminal according to the received scanning time preset by the user terminal; and clearing the buffered probe response message after determining that the timer reaches the preset scanning time and the probe response message is not sent to the user terminal.