Wi-Fi Roaming Cache Synchronization for Low-Latency Handoffs
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Solution Overview
Problem
Conventional Wi-Fi roaming processes experience significant latency due to unreliable synchronization of session and client-related data, particularly affecting applications requiring high performance, such as VoIP and video conferencing, leading to interruptions and suboptimal user experiences.
Innovation Solution
Implementing a roaming cache in Wi-Fi access points to preemptively synchronize session and client-related data for high-performance applications to neighboring access points, using access control lists to identify and flag fast-roaming data, and periodically broadcasting this data to reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If session data is synchronized from home AP to target AP during roaming, then connectivity is maintained, but roaming latency increases
Solution Approach 1:
The patent pre-synchronizes session data for high-performance applications to neighboring APs before roaming occurs. When a client device roams, the target AP already has the necessary session data in its cache, eliminating the need for real-time data transfer and reducing roaming latency to less than one millisecond while maintaining connectivity continuity.
2Loss of time
If all session data is synchronized to all neighboring APs, then roaming latency is reduced, but network bandwidth consumption increases
Solution Approach 1:
The patent applies different synchronization strategies based on application requirements. High-performance applications (VoIP, video conferencing, online gaming) have their session data pre-synchronized to neighboring APs, while standard applications use traditional synchronization methods. This localized approach ensures low latency for sensitive applications without unnecessarily consuming bandwidth for all applications.
Solution Approach 2:
The system dynamically adjusts the synchronization behavior based on application characteristics. By identifying applications that require high roaming performance and applying pre-synchronization only to those, the system optimizes the balance between roaming latency and bandwidth consumption according to specific performance parameters.
3Speed
If session data is pre-synchronized to neighboring APs, then roaming performance is improved, but device complexity increases
Solution Approach 1:
The patent implements automatic mechanisms for identifying high-performance applications, determining neighboring APs, and managing session data pre-synchronization. The system self-manages the roaming cache, automatically updating and maintaining session data without requiring manual configuration or complex intervention, thereby reducing the operational complexity despite the enhanced functionality.
Data Source
AI summary
One aspect can provide a system and method for fast Wi-Fi roaming. The system can identify forwarding data associated with a first active session of a first application running on a client device coupled to a home access point (AP), determine a number of neighboring APs comprising a target AP, maintain a roaming cache on each of the neighboring APs, and synchronize the identified forwarding data associated with the first active session to the roaming cache on each neighboring AP. In response to determining that the client device is roaming to the target AP, the system can access the roaming cache on the target AP to obtain the forwarding data associated with the first active session in order to continue the first active session on the client device with reduced roaming latency, thereby facilitating fast roaming of the client device from the home AP to the target AP.