MLD Epoch Alignment Using TSF-Based ESS Privacy Discovery
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Solution Overview
Problem
Existing IEEE 802.11 standards face challenges in ensuring privacy and epoch alignment for Multi-Link Devices (MLDs), particularly in maintaining consistent MAC addresses and aligned epoch sequences across different links within Multi-Link Multi-Device (MLD) networks, which can lead to unaddressed tracking and privacy issues.
Innovation Solution
Implementing an Enhanced Data Privacy (EDP) mechanism with ESS identity keys for over-the-air identifier computation and encrypted privacy beacon frames to solicit privacy and align epoch sequences across MLD links, using HMAC-SHA-256 for key derivation and timestamp masking, and adjusting TSF values for synchronized epoch start times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ESS identity keys and encrypted privacy beacon frames are used for privacy protection, then tracking prevention is improved, but device complexity increases
Solution Approach 1:
The patent introduces ESS identity keys as intermediary cryptographic elements that enable privacy protection without requiring constant SSIDs. These keys act as mediators between the AP and non-AP MLDs, allowing encrypted beacon frames to be exchanged while preventing tracking, thus resolving the contradiction between privacy improvement and complexity increase
Solution Approach 2:
The patent changes the parameter of identifier usage from constant SSIDs to dynamic ESS identity keys. This parameter change enables the system to maintain privacy by preventing tracking while managing complexity through standardized key derivation procedures using HMAC-SHA-256
2Reliability
If epoch sequences are aligned across MLD links, then network integrity is improved, but synchronization complexity increases
Solution Approach 1:
The patent applies preliminary action by establishing epoch alignment before actual data transmission occurs. The AP MLD initiates epoch sequence alignment across all MLD links in advance, ensuring network integrity is maintained from the outset without requiring complex real-time synchronization adjustments
Solution Approach 2:
The patent implements feedback mechanisms where non-AP MLDs respond to privacy beacon frames with acknowledgment frames that confirm epoch alignment status. This feedback loop enables the system to verify and maintain synchronized epoch sequences across all links, ensuring network integrity while managing synchronization complexity
3Stability of the object's composition
If TSF values are adjusted for synchronized epoch start times, then epoch alignment is improved, but processing time increases
Solution Approach 1:
The patent applies periodic action by establishing synchronized epoch start times at regular intervals across all MLD links. The TSF values are adjusted periodically to maintain alignment, which improves epoch synchronization while the periodic nature of the operation allows for efficient processing without excessive time loss
Data Source
AI summary
The application relates to ESS privacy discovery and epoch alignment for MLD. An apparatus used in a MLD is disclosed, wherein the apparatus includes processor circuitry configured to cause the MLD to generate and transmit a frame carrying an element containing epoch setting, which includes a field with a Time Synchronization Function (TSF) value to determine next epoch start time, wherein: a MLO Link Information element is not included in the frame, the field with the TSF value is determined based on the TSF value of an AP corresponding to a link that is used to transmit the frame; or the MLO link information element is included in the frame, the field with the TSF value is determined based on the TSF value of the AP corresponding to the link indicated in the MLO Link Information element.