Wireless Client Association Cookie for Roaming Context Transfer
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Solution Overview
Problem
Current wireless network infrastructure faces challenges in seamlessly transferring association and traffic details of wireless clients as they roam between access points, leading to disruptions and inefficiencies in maintaining context data.
Innovation Solution
Implementing an opaque cookie mechanism where an access point or wireless LAN controller provides context data, including association and traffic information, to wireless clients, which are then passed to new access points during roaming, allowing for efficient transfer and updating of context data without client modification or understanding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless infrastructure accesses association and traffic details from centralized databases or previous access points during roaming, then client context information can be obtained, but roaming latency increases and seamless roaming is disrupted
Solution Approach 1:
The access point embeds the client's association and traffic context information into a cookie that is provided to the client before roaming occurs. This preliminary action ensures that when the client roams to a new access point, the context information is already available locally, eliminating the need for real-time database lookups and reducing roaming latency
Solution Approach 2:
A cookie serves as an intermediary carrier that transports client context information between access points. Instead of directly querying centralized databases or previous access points during roaming, the cookie mediates the transfer of association and traffic details, enabling fast and seamless roaming while maintaining information availability
2Productivity
If the access point embeds context information in a cookie for the client, then roaming efficiency improves and latency reduces, but data security requirements increase
Solution Approach 1:
The access point creates a copy of the client's context information in the form of a cookie that can be safely transmitted and stored. This copying approach allows the original security-sensitive data to remain protected in the centralized database while enabling efficient roaming through the distributed cookie copy
Solution Approach 2:
The cookie can be implemented in different forms including opaque cookies that cannot be read or modified by the client, and non-opaque cookies that can be read and modified. This parameter change in cookie transparency allows flexibility in balancing security requirements with roaming efficiency for different deployment scenarios
Data Source
AI summary
In an example embodiment, an access point or wireless local area network controller programs an opaque cookie into a wireless client. The cookie carries association detail and current traffic information of the client. When the client roams to a new access point, the client presents the cookie to the new access point.