Proactive Probe Response for WLAN Roaming Stickiness
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Solution Overview
Problem
In WLAN systems, wireless terminals often exhibit 'stickiness' to current access points due to delayed detection of signal strength changes, leading to suboptimal roaming and service quality, as different manufacturers implement scanning operations differently, resulting in varying behaviors and lag between actual and sensed signal strength.
Innovation Solution
Access points proactively send probe response frames to wireless terminals when signal or data transmission quality falls below a predetermined threshold, encouraging quicker signal strength sensing and roaming to neighboring access points, thereby reducing stickiness and improving service quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wireless terminals use traditional scanning operations to detect signal strength, then manufacturers can implement different scanning behaviors, but this leads to delayed detection of signal changes and stickiness to current access points
Solution Approach 1:
The access point proactively sends probe response frames to the wireless terminal before the terminal initiates scanning, providing advance information about available access points and their signal strengths. This preliminary action eliminates the delay caused by waiting for terminal scanning and enables faster roaming decisions.
Solution Approach 2:
The system implements a feedback mechanism where the access point continuously monitors terminal presence and actively provides signal strength information through probe response frames. This feedback loop ensures the terminal receives real-time information about signal conditions, enabling timely roaming without relying on periodic terminal scanning.
2Speed
If access points send probe response frames proactively, then roaming detection speed improves, but additional communication overhead is introduced
Solution Approach 1:
The access point sends probe response frames selectively rather than continuously - specifically when terminals are in the process of roaming or when signal conditions change. This partial action provides sufficient information to improve roaming speed without the excessive energy consumption of continuous broadcasting.
Data Source
AI summary
The present disclosure describes promoting roaming of a wireless terminal in a wireless local area network (WLAN). The AP obtains signal quality and/or data transmission quality of the wireless terminal periodically, and determines whether the obtained signal quality and/or data transmission quality of the wireless terminal satisfies a predetermined threshold. Upon determining that the predetermined threshold is not satisfied, the AP proactively sends a probe response frame to the wireless terminal. The probe response frame notifies the wireless terminal of a wireless signal strength of the AP to promote roaming to a neighboring AP.