WLAN Notification Distribution via Beacon Hashes
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Solution Overview
Problem
Current wireless local area networks (WLANs) face limitations in delivering notifications to both associated and non-associated stations, with restricted information flow from the access point to non-associated stations, hindering effective notification advertisement and distribution.
Innovation Solution
The proposed solution involves an access point (AP) broadcasting notification identifiers in beacon and probe response frames, using notification information elements (IEs) that include HMAC-SHA1-64 hashes, allowing both associated and non-associated stations to receive and process notifications, and enabling stations to retrieve notification messages through Access Network Query Protocol (ANQP) or by modifying the SSID with notification messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the AP uses traditional two-state connection process for information delivery, then security and network management are maintained, but information flow to non-associated stations is severely restricted
Solution Approach 1:
The notification information is segmented into two parts: notification identifiers (hashes) are broadcast to non-associated stations, while full notification messages are delivered only to associated stations. This segmentation allows information to reach both states appropriately without compromising security or overwhelming non-associated stations with excessive data.
Solution Approach 2:
Notification identifiers act as intermediaries that bridge the gap between non-associated and associated states. Non-associated stations receive these identifiers and can selectively request full notification messages, enabling information flow without requiring full association establishment for every notification.
2Loss of information
If the AP broadcasts full notification messages to all stations, then complete information delivery is achieved, but network overhead and energy consumption increase significantly
Solution Approach 1:
The essential identifying information (notification identifiers/hashes) is extracted from full notification messages and broadcast separately to all stations. This allows non-associated stations to determine relevance without receiving complete message content, significantly reducing network overhead and energy consumption while maintaining information completeness for those who need it.
Solution Approach 2:
Instead of providing full notification messages to all stations (excessive action), the system provides partial information (identifiers only) to non-associated stations and full messages only to associated stations who have established connectivity. This partial action approach optimizes energy efficiency while ensuring complete information delivery where appropriate.
3Adaptability or versatility
If the system allows non-associated stations to receive notifications, then notification coverage is improved, but network security and authentication mechanisms are challenged
Solution Approach 1:
Different levels of notification information are provided to different station states: non-associated stations receive only notification identifiers (local quality for their capability level), while associated stations receive complete notification messages. This local quality approach enhances accessibility without compromising security, as each station receives information appropriate to its authentication state.
Solution Approach 2:
Notification identifiers are broadcast in advance to non-associated stations before they associate with the network. This preliminary action allows stations to pre-evaluate notification relevance and only establish full association if needed, improving accessibility while maintaining security by deferring full information delivery until authentication is complete.
Data Source
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AI summary
An Access Point (AP) advertises the availability of notifications, and this advertisement may be received and interpreted by stations (STAs), both by associated STAs and by non- associated STAs. Upon being informed of the availability of the notification message, a STA may take action in order to receive the notification message from the AP. Alternatively, the STA may be able to identify the notification message by analyzing the advertisement. If the contents of the notification message comprise a control message, the STA may act on the control message in a way that influences the STA's behavior. If the contents of the notification message indicate restrictions imposed by the AP, the STA may determine, in view of the restrictions, not to attempt association with the AP.