Wireless Roaming Handover via Access Controller Coordination
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining continuous data communication for mobile Bluetooth devices as they move between different access points, requiring a seamless handover process to prevent interruptions.
Innovation Solution
A system and method that involves detecting signal strength, disconnecting devices from access points when signal strength falls below a threshold, and coordinating handovers through an access controller to ensure continuous Bluetooth communication across overlapping coverage areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a Bluetooth device moves between coverage areas of different access points, then the device can maintain mobility and access wider coverage, but the data communication may be interrupted during handover between access points
Solution Approach 1:
The access controller proactively identifies candidate access points for handover before the current connection is lost. The system pre-establishes connection parameters and security context for the target access point, so that when handover is initiated, the connection can be rapidly re-established without interruption to data communication.
Solution Approach 2:
The access controller serves as an intermediary that coordinates the handover process between the moving Bluetooth device and multiple access points. It manages the transfer of connection context and security information, ensuring seamless transition while maintaining continuous data communication through the intermediary's coordination.
2Reliability
If the access controller coordinates handover between multiple access points, then seamless roaming is achieved, but the system complexity increases due to the need for centralized coordination and connection status tracking
Solution Approach 1:
The patent combines the control functions for multiple access points into a single access controller. This centralization merges the coordination logic, connection status tracking, and handover management into one device, reducing overall system complexity while ensuring seamless roaming through unified control.
Solution Approach 2:
The access controller is designed as a universal device that can manage connections for multiple access points simultaneously. It performs multiple functions including monitoring signal strength, selecting candidate access points, transferring connection context, and maintaining security, thereby reducing the need for complex distributed control logic across individual access points.
3Ease of operation
If signal strength threshold is used to trigger disconnection, then automatic handover is simplified, but premature disconnection may occur in overlapping coverage areas causing communication interruptions
Solution Approach 1:
The access controller continuously monitors signal strength feedback from the client device and uses this information to make intelligent handover decisions. Rather than relying solely on a fixed threshold that may cause premature disconnection, the system uses feedback about the client's movement pattern, current connection quality, and available candidate access points to determine the optimal time for handover, ensuring communication continuity.
Solution Approach 2:
Before triggering disconnection based on signal strength threshold, the access controller performs preliminary actions by identifying candidate access points and preparing handover parameters in advance. This preliminary preparation ensures that when the threshold is crossed, the handover can proceed smoothly without causing communication interruptions.
Data Source
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AI summary
A method for supporting wireless roaming among coverage areas of a plurality of access points may comprise detecting, by a first access point of the plurality of access points, signal strength of signals from a client device that is wirelessly connected to the first access point; comparing the signal strength with a threshold, and if the signal strength is less than the threshold, disconnecting, by the first access point, the client device from the first access point; transmitting, by the first access point, a signal indicating the disconnection of the client device to an access controller; updating, by the access controller, connection status information to indicate the disconnection of the client device from the first access point; transmitting, by the access controller, the connection status information of the client device to the plurality of access points; and connecting the client device with a second access point of the plurality of access points.