Wi-Fi Station Detection via Unique SSID Mapping
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Solution Overview
Problem
Current Wi-Fi systems face ambiguity in monitoring the number of stations in a coverage area due to MAC address randomization, which affects network resource optimization and can lead to incorrect user tracking and data traffic management.
Innovation Solution
The method involves access points sending a radio measurement request with a unique SSID to stations, associating the source address of probe requests with a persistent MAC address stored in a database, allowing for accurate detection of stations within the coverage area without requiring modifications to stations or coordination between access points and stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If MAC address randomization is implemented in Wi-Fi stations to prevent user tracking, then user privacy is improved, but network monitoring accuracy and station detection capability deteriorate
Solution Approach 1:
The patent introduces a unique SSID as an intermediary identifier that links the random MAC address (used for privacy) with the permanent MAC address (used for monitoring). When a station sends a probe request with a random MAC address, the access point extracts the unique SSID, looks up the corresponding permanent MAC address in the database, and uses that for accurate station detection and monitoring while preserving the station's privacy through MAC randomization
Solution Approach 2:
The patent creates a mapping copy between random MAC addresses and permanent MAC addresses through the unique SSID. The access point maintains a database that copies the relationship between temporary random identifiers and permanent station identifiers, enabling accurate monitoring without exposing the station's true identity
2Object-affected harmful factors
If different MAC addresses are used by stations during the same session, then user privacy is improved, but network resource optimization and state management become ambiguous
Solution Approach 1:
The unique SSID acts as a mediator that resolves the ambiguity of multiple MAC addresses. Network resource optimizers can use the permanent MAC address (retrieved via the unique SSID from the random MAC address) to accurately track station behavior, monitor resource usage, and manage network state, eliminating the confusion caused by MAC address changes
Solution Approach 2:
The patent establishes a feedback mechanism where the access point continuously updates the mapping between random MAC addresses and permanent MAC addresses in the database. This feedback loop ensures that network resource optimizers always have the correct permanent MAC address to track station behavior and optimize network resources effectively
3Object-affected harmful factors
If MAC address randomization is implemented, then user privacy is improved, but coordination between access points and stations becomes necessary, increasing system complexity
Solution Approach 1:
The station performs self-service by including its unique identifier (permanent MAC address or other unique SSID) within the probe request frame itself. This allows the access point to automatically extract the identifier and perform the MAC address mapping without requiring any additional coordination, handshaking, or communication between the access point and station
Solution Approach 2:
The station prepares its unique identifier in advance and includes it in the probe request frame before any association or authentication occurs. This preliminary action enables the access point to immediately establish the mapping between random and permanent MAC addresses without requiring subsequent coordination steps
Data Source
AI summary
Method and system for detecting stations in wireless local area networks having at least one access point configured to: upon transmission of an association response to a station, send a radio measurement request to the station performing active scanning of a SSID having a unique identifier univocally associated with a persistent MAC address of the station, upon reception of a probe request, check if the SSID field has a unique identifier univocally associated with a persistent MAC address of a station, and associate the source address of the probe request with the persistent MAC address of the station on a database of known stations; detect stations within the coverage area of the access point based on the information stored on the database of known stations.