Fast BSS Transition Via Backhaul for Seamless AP Handover
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Solution Overview
Problem
Wireless communication devices face challenges in efficiently transitioning between Access Points (APs) as they move out of range, leading to disruptions in communication.
Innovation Solution
Implementing a Fast Basic Service Set (BSS) Transition (FT) scheme that utilizes multi-link communication and backhaul connections to facilitate seamless handovers between APs, enhancing communication stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mobile device switches communication from a first AP to a second AP when moving out of range, then the device can maintain connectivity, but communication disruptions occur during the transition
Solution Approach 1:
The patent implements preliminary action by establishing a backhaul connection between the first AP and second AP before the mobile device actually needs to switch. The network performs resource reservation and path setup in advance, so when the device moves out of range, the handover can occur immediately without waiting for connection establishment, thus eliminating communication disruptions during transition.
Solution Approach 2:
The patent introduces a backhaul connection as an intermediary mechanism between the first AP and second AP. This backhaul connection acts as a pre-established communication bridge that enables seamless handover. The backhaul connection serves as a mediator that coordinates the transition process, allowing the mobile device to switch APs without experiencing connectivity interruptions.
2Adaptability or versatility
If traditional AP switching is used, then the device can roam between APs, but communication stability is disrupted during handover
Solution Approach 1:
The system performs resource reservation and path establishment in advance through the backhaul connection before the actual handover event. This preliminary action ensures that all necessary communication paths are already in place, maintaining communication stability during the AP switching process while preserving the device's ability to roam between APs.
Solution Approach 2:
The backhaul connection enables continuous communication during the handover process by maintaining an active data path between the first AP and second AP. Instead of having communication interrupt during the transition, the useful action of data transmission continues uninterrupted through the pre-established backhaul pathway, thus maintaining communication stability while allowing AP switching.
Data Source
AI summary
For example, a STA may transmit a Fast Basic Service Set (BSS) Transition (FT) request to a target AP via a current AP with which the STA is associated, wherein the FT request is configured to request an FT from the current AP to the target AP; process an FT response from the target AP after the FT request, the FT response received by the STA via the current AP; transmit a reassociation request to the target AP via the current AP after the FT response, the reassociation request to request to associate between the STA and the target AP; process a reassociation response from the target AP after the reassociation request, the reassociation response received by the STA via the current AP; and switch the STA from the current AP to the target AP for communication via an associated session between the STA and the target AP.