WLAN Access Point Roaming via Control Traffic Channel Segmentation
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Solution Overview
Problem
Current Wi-Fi systems experience discontinuous connections when devices move from one WLAN access point to another due to limited spectrum fragmentation, leading to inefficient roaming between different frequency bands.
Innovation Solution
Implementing a network of WLAN access points with overlapping coverage areas, where a first access point provides control information and establishes a lower data rate connection, while secondary access points handle traffic connections in different frequency bands, allowing for simultaneous maintenance of control and traffic channel connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a device roams between different WLAN access points using different frequency bands, then the device can access different coverage areas, but the connection becomes discontinuous and performance deteriorates
Solution Approach 1:
The patent segments the connection into two independent channels: a control channel maintained with the first access point and a traffic channel established with the second access point. This segmentation allows the device to simultaneously manage control signaling and data traffic through different paths, preventing connection discontinuity during roaming between frequency bands.
Solution Approach 2:
The first access point acts as an intermediary that maintains the control channel connection even when the device connects to a second access point for traffic. This intermediary role allows seamless handover and continuous connectivity by mediating between the device and the network infrastructure during frequency band transitions.
2Area of stationary object
If the first access point operates in a lower frequency band with lower data rate, then coverage area increases and control channel reliability improves, but traffic transmission efficiency decreases
Solution Approach 1:
The patent applies different quality characteristics to different channels: the control channel uses lower frequency band for broader coverage and reliability, while the traffic channel uses higher frequency band for efficient data transmission. This local quality differentiation optimizes each channel for its specific function rather than using a single frequency for both purposes.
Solution Approach 2:
The patent segments traffic transmission into control plane (lower frequency) and data plane (higher frequency), allowing simultaneous optimization of both coverage area and transmission efficiency by assigning appropriate frequency bands to each segment.
3Adaptability or versatility
If multi-band capable devices are used to support roaming between different access points, then frequency band flexibility improves, but device complexity increases
Solution Approach 1:
The patent segments the radio frequency operations into separate control and traffic functions, allowing the device to use multi-band capabilities more efficiently by dedicating different frequency bands to different purposes rather than requiring full multi-band support for all functions simultaneously.
Data Source
AI summary
A method of operation of a network of WLAN access points comprises establishing a first WLAN access point (APa) having a first coverage area; and establishing a plurality of second WLAN access points (AP1, . . . , AP7) having respective second coverage areas, such that the second access points provide traffic connections for at least one communications device in at least one of the respective second coverage areas; wherein the first coverage area overlaps the plurality of second coverage areas, and wherein the first WLAN access point provides control information for the at least one communications device.