EDP Roaming Between Access Points With Cryptographic State Continuity
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Solution Overview
Problem
Wireless clients face challenges in maintaining enhanced data privacy (EDP) during seamless roaming between basic service sets (BSSs) due to incompatible EDP parameters and discontinuity in shared cryptographic states, leading to reduced communication performance and increased tracking risk.
Innovation Solution
Techniques for exchanging EDP information among APs and clients to facilitate seamless roaming by preserving EDP group parameters and maintaining cryptographic state continuity, including proactive EDP group selection and automatic state transfer, reducing signaling latency and bandwidth overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If privacy enhancements are implemented by anonymizing frame parameters, then client tracking resistance is improved, but seamless roaming capability deteriorates due to incompatible EDP parameters between different APs
Solution Approach 1:
The patent applies preliminary action by having the source AP transfer the client's EDP group information and cryptographic state to the target AP before the client actually roams. This pre-provisioning of EDP parameters enables the client to seamlessly join the target AP's EDP group without interruption, resolving the contradiction between maintaining privacy through anonymization and enabling smooth roaming between different APs with potentially incompatible EDP configurations
Solution Approach 2:
The source AP acts as an intermediary by facilitating the transfer of EDP group information and cryptographic state from the source AP to the target AP. This intermediary mechanism ensures that the client's privacy protections (EDP group membership) are maintained during the transition between APs, allowing the client to roam seamlessly while continuing to benefit from anonymized frame parameters
2Object-affected harmful factors
If EDP group changes are implemented during roaming, then privacy protection is maintained, but communication performance deteriorates due to signaling latency and bandwidth overhead
Solution Approach 1:
The patent applies preliminary action by completing the EDP group information transfer and cryptographic state provisioning before the client actually performs the roaming operation. The source AP sends the client's EDP group information to the target AP in advance, so that when the client roams, it can immediately join the appropriate EDP group without experiencing signaling latency or bandwidth overhead during the critical roaming transition
Solution Approach 2:
The patent enables the client to skip the usual time-consuming EDP group establishment process during roaming by having this information pre-configured on the target AP. The client can rapidly join the pre-provisioned EDP group without going through lengthy negotiation and setup procedures, thus maintaining privacy protection while minimizing impact on communication performance
Data Source
AI summary
Techniques and apparatus for supporting seamless roaming for enhanced privacy wireless stations are described. An example technique performed by a wireless station includes obtaining, while associated with a first access point (AP) in a first basic service set (BSS) and associated with a first enhanced data privacy (EDP) group supported by the first AP, information associated with one or more EDP groups supported by a second AP in a second BSS. Upon roaming from the first AP in the first BSS to the second AP in the second BSS, a second EDP group of the one or more EDP groups is joined, based at least in part on the information.