Wireless AP Roaming Authentication With Context Transfer
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Solution Overview
Problem
Existing wireless networks face challenges in seamless mobility and authentication processes during handovers, leading to latency and disruption in delay-sensitive applications like augmented reality and robotics, especially with the introduction of multi-link operations.
Innovation Solution
Implementing a seamless mobility domain (SMD) management system that allows for coordinated authentication and context transfer between multiple access points, using a SMD identifier and management entity to facilitate smooth roaming and reduce handover delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional authentication processes are used during handovers in wireless networks, then security is maintained, but handover latency increases and connectivity disruption occurs
Solution Approach 1:
The patent implements preliminary authentication by establishing a Pairwise Master Key (PMK) cache before handover occurs. The PMK is pre-computed and stored in both the STA and AP, allowing the STA to immediately authenticate with a target AP during handover without performing full authentication procedures. This preliminary action eliminates authentication latency during actual handover while maintaining security through cryptographic key management.
Solution Approach 2:
The patent introduces a PMK cache as an intermediary storage mechanism between the STA and AP. This cache holds pre-established cryptographic keys that mediate the authentication process during handover. The PMK cache acts as a buffer that allows seamless transition between APs by providing ready-to-use authentication credentials, thus reducing handover disruption while maintaining security protocols.
2Productivity
If multi-link operations are implemented to reduce latency, then throughput increases, but authentication complexity and device complexity increase
Solution Approach 1:
The patent merges the authentication management across multiple links by implementing a unified PMK cache that serves all links simultaneously. Instead of maintaining separate authentication states for each link, the system combines authentication credentials into a single cache structure that can be shared across multiple links, reducing authentication complexity while enabling multi-link operations for improved throughput.
Solution Approach 2:
The PMK cache is designed as a universal authentication mechanism that functions across multiple links and APs. The same cached PMK can be used for authentication on different links and with different APs within the same network domain, providing multi-functionality that reduces authentication complexity while supporting multi-link operations for enhanced productivity.
Data Source
AI summary
In an embodiment, a station (STA) may transmit an authentication request to a current AP to be authenticated with one or more target access points (APs) and the current AP may communicate with the one or more target APs to authenticate the STA and to perform a context transfer of one or more contexts or agreements to the target APs. The current AP and the target APs may be part of a seamless roaming domain, which may provide functionalities for performing the authentication and context transfer.