Short Probe Response Frame for Wireless LAN Scanning Overhead Reduction
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Solution Overview
Problem
Next-generation wireless LAN systems operating in a band of 1 GHz or less face challenges with scanning efficiency due to reduced data transmission speeds and increased overhead from active scanning methods, particularly due to the exchange of probe request-response frames in a narrow bandwidth environment.
Innovation Solution
A scanning method utilizing a short probe response frame that selectively includes necessary information, allowing stations to associate with access points more efficiently by reducing overhead and enabling association without waiting for a full beacon frame, through the transmission of a probe request frame and reception of a short probe response frame containing SSID or compressed SSID information, along with options requested by the station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a probe request-response frame exchange is used for active scanning, then the station can discover access points quickly, but the overhead increases significantly in narrow bandwidth environments
Solution Approach 1:
The patent extracts only the essential information elements needed for station association from the full beacon frame, creating a condensed probe response frame that contains only critical data such as SSID, BSS type, and association-essential parameters, thereby reducing overhead while maintaining scanning efficiency
Solution Approach 2:
The patent changes the parameter set included in the probe response frame by selectively including only necessary information elements based on the station's association requirements, rather than transmitting complete beacon frame data, thus optimizing the balance between information completeness and overhead reduction
2Loss of information
If a full beacon frame is transmitted to provide complete network information, then all necessary information is available, but the frame size and transmission overhead increase
Solution Approach 1:
The patent extracts and includes only the essential information elements required for station association in the probe response frame, such as SSID, BSS type, and key parameters, while omitting redundant or non-essential elements, thereby reducing frame size while preserving information completeness for association purposes
Solution Approach 2:
The patent applies partial action by including only the subset of information elements that are partially sufficient for association (those essential for initial connection), rather than providing complete beacon frame information, achieving adequate functionality with reduced overhead
Data Source
AI summary
A scanning method performed by a station (STA) in a wireless LAN system is provided. The method comprises: transmitting a probe request frame; and receiving a short probe response frame from an access point (AP) as a response to the probe request frame. The short probe response frame includes service set ID (SSID) information or compressed SSID information of the AP.