Access Point OFDMA Station Count for WLAN Selection
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Solution Overview
Problem
Current access point selection methods in WLANs are inadequate as they do not provide sufficient information for stations to choose the most suitable access point, especially in scenarios where OFDMA capability is crucial, leading to suboptimal connections and increased handover risks.
Innovation Solution
Access points determine and transmit information about the number of stations capable of using OFDMA, allowing stations to select the most suitable access point based on this information, enhancing the accuracy of handover decisions and system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If access points broadcast limited information (BSS Load Element) to stations, then the information transmission overhead is reduced, but the station's ability to select the optimal access point deteriorates
Solution Approach 1:
The patent segments the station count information into two distinct fields: a first field indicating the total number of stations associated with the AP, and a second field indicating the number of OFDMA-capable stations. This segmentation allows stations to receive comprehensive information for optimal AP selection without requiring a complete restructuring of the information element, thus resolving the contradiction between information completeness and structural complexity.
2Measurement precision
If access points provide detailed information about all served stations, then station selection accuracy improves, but the processing overhead and information element size increase
Solution Approach 1:
The patent extracts only the critical information needed for AP selection - specifically, the count of OFDMA-capable stations - from the complete station information set. By providing this key subset information in the second field of the BSS Load Element, the patent enables accurate AP selection without transmitting detailed information about every individual station, thus resolving the contradiction between selection accuracy and information volume.
3Productivity
If stations rely on incomplete BSS Load Element information for AP selection, then the handover process is simpler and faster, but the handover success rate and connection stability deteriorate
Solution Approach 1:
The patent enables stations to perform preliminary assessment of AP suitability by providing OFDMA-capable station count information in the BSS Load Element before the handover decision is made. This allows stations to identify and select APs with appropriate capabilities in advance, ensuring both fast execution and high success rate of handovers by making informed decisions based on capability-matched AP selection.
Data Source
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AI summary
Embodiments herein relate to a method performed by an Access Point, AP (131, 132), of a Wireless Local Area Network, WLAN (135, 136), for enabling a station, STA (121), to select an AP (131, 132). The AP (131, 132) determines information indicating the number of STAs currently being served by the AP (131, 132) which are capable of using Orthogonal Frequency-Division Multiplexing Access, OFDMA, in the WLAN (135, 136). Then, the AP (131, 132) transmit the determined information to the STA (121). Embodiments of the AP (131, 132) are also described. Embodiments herein also relate to a method performed by a STA (121) for selecting an AP (131, 132) of a WLAN (135, 136) and embodiments of the STA (121).