Pre-Roam AP Connection for Seamless Wi-Fi Handover
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Solution Overview
Problem
Current Wi-Fi networks face challenges in seamlessly transferring data and maintaining connectivity when a station (STA) moves between access points (APs), often resulting in congestion, reduced bandwidth, and interrupted connections due to the lack of efficient state transfer and data aggregation protocols.
Innovation Solution
The method involves determining when a new AP provides enhanced characteristics such as stronger connections and lower congestion, and then transferring medium access control service data units (MSDUs), aggregated-MSDUs, and aggregated-MPDUs from the existing AP to the new AP, utilizing tunnels and sequence number gaps to ensure continuous data flow and minimize interruptions during roaming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data transfer is performed at the roam point, then connectivity is maintained, but data loss and interruption occur due to lack of efficient state transfer protocols
Solution Approach 1:
The patent applies preliminary action by establishing a new AP connection before the STA actually roams. The network determines enhanced characteristics of a new AP in advance, creates the necessary data structures and tunnels beforehand, and prepares the state transfer mechanism. This allows the STA to switch connections smoothly without data loss, as the infrastructure is already in place to receive and continue the data stream.
Solution Approach 2:
The patent uses an intermediary approach by introducing a new AP as a mediator between the current AP and the STA. The new AP acts as a buffer and continuation point, receiving state information and data from the current AP before the STA disconnects. This intermediary structure enables seamless handover and prevents data loss during the transition.
2Device complexity
If traditional roaming is used, then simplicity is maintained, but network performance deteriorates due to congestion and reduced bandwidth
Solution Approach 1:
The patent implements feedback mechanisms where the network continuously monitors characteristics of available APs and compares them against current connection quality. When enhanced characteristics are detected (lower congestion, better bandwidth), the system automatically triggers a switch to the new AP. This feedback loop enables dynamic optimization of network performance without requiring complex manual intervention.
Solution Approach 2:
The system performs preliminary assessment of potential APs and establishes connections in advance. By determining enhanced characteristics before the actual roaming event, the network can prepare the necessary state transfer infrastructure, ensuring that when the STA needs to switch, the new connection is ready to handle data immediately, thus maintaining high network performance.
3Reliability
If state transfer is performed at roam point, then connection is maintained, but transfer time increases due to lack of pre-established connections
Solution Approach 1:
The patent applies preliminary action by pre-establishing the new AP connection and transferring required state information before the actual roaming event. The network determines enhanced characteristics of a new AP, creates the necessary data structures, and initiates state transfer in advance. This eliminates the need for time-consuming connection establishment during the roam point, significantly reducing transfer time while maintaining connection reliability.
Data Source
AI summary
Method, system, and/or computer readable medium for roaming on a Wi-Fi network having a plurality of access points including: determining that a new AP actor provides a station (STA) actor enhanced characteristics as compared to an existing AP actor, wherein the enhanced characteristics include one or more of a stronger connection, lower congestion, and/or increased bandwidth; transferring required state from the existing AP actor to the new AP actor; and transferring at least some of data wherein the at least some data includes one or more of medium access control service data units (MSDUs), aggregated-MSDUs (A-MSDUs), medium access control protocol data units (MPDUs), and/or aggregated-MPDUs from the existing AP actors to the new AP actor.