TBTT Synchronization via Timing Frames
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Solution Overview
Problem
In wireless networking, existing technologies face challenges in efficiently synchronizing target beacon transmission times (TBTT) between access point (AP) devices, leading to inefficiencies in network connectivity and user experience, particularly in densely populated environments where management traffic and latency can hinder seamless transitions between Wi-Fi networks.
Innovation Solution
The method involves embedding TBTT information in timing synchronization frames, such as neighbor discovery packets and fast initial link setup (FILS) discovery frames, to synchronize AP devices, and using off-channel scans and reduced interval transmissions to propagate this information efficiently, while also employing a WLAN controller for error minimization and time synchronization accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TBTT synchronization is implemented using traditional methods, then network connectivity is maintained, but management traffic increases and latency increases in densely populated environments
Solution Approach 1:
The patent combines TBTT synchronization information with existing beacon frames and discovery frames, merging multiple functions into a single communication mechanism. This reduces the need for separate synchronization traffic while maintaining accurate timing coordination across access points in dense environments.
Solution Approach 2:
The system performs preliminary TBTT information exchange during the beacon frame transmission phase, so that access points have synchronization data available before actual data transmission begins. This preliminary action reduces latency and prevents the need for additional management traffic during active communication.
2Productivity
If TBTT synchronization is implemented using traditional methods, then network connectivity is maintained, but user experience deteriorates due to latency and seamless transitions
Solution Approach 1:
The patent establishes continuous TBTT synchronization through periodic beacon frames and discovery frames, ensuring that access points maintain updated timing information without interruption. This continuous action eliminates gaps that would cause latency and enables seamless transitions for users moving between access points.
Solution Approach 2:
The system implements feedback mechanisms where access points exchange TBTT information and adjust their timing based on received data. This closed-loop feedback ensures continuous optimization of synchronization accuracy, reducing latency and improving user experience in real-time.
3Reliability
If TBTT information is disseminated among AP devices, then network synchronization is improved, but device complexity increases
Solution Approach 1:
The patent makes existing beacon frames and discovery frames multi-functional by embedding TBTT synchronization information within them. This universal approach allows single frames to serve both traditional purposes and synchronization functions, improving reliability without significantly increasing device complexity.
4Measurement precision
If off-channel scans are used to propagate TBTT information, then synchronization accuracy is improved, but management traffic increases
Solution Approach 1:
The patent implements partial off-channel scanning where access points perform selective scans only when necessary to obtain TBTT information, rather than continuous full scans. This partial action achieves sufficient synchronization accuracy while minimizing the generation of management traffic.
Data Source
AI summary
In one embodiment, a method is performed. A first wireless access point (AP) device may generate a timing synchronization frame. The timing synchronization frame may include a target beacon transmission time (TBTT) associated with the first wireless AP device. The first wireless AP device may transmit the timing synchronization frame to a second wireless AP device. The first and second wireless AP devices may be synchronized using the timing synchronization frame.