Centrally Managed Wi-Fi via SDN Layer 2 Virtual Switching
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Solution Overview
Problem
Current Wi-Fi management solutions, particularly in residential and outdoor applications, face scalability issues due to the proliferation of Wi-Fi devices, as standalone access points require tedious configuration and are difficult to manage centrally, leading to high costs and single points of failure in existing controller-based architectures.
Innovation Solution
The implementation of software-defined networking (SDN) principles to create a Layer 2 virtual switching domain, separating the data and control planes, allowing for a highly scalable and cost-effective centrally managed Wi-Fi architecture that supports millions of devices by using a Wi-Fi access gateway connected via IP connections across a wide area network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standalone access points are deployed to support Wi-Fi devices, then Wi-Fi coverage is provided, but configuration and management becomes tedious and error-prone
Solution Approach 1:
A centralized controller is introduced as an intermediary between network administrators and multiple access points. The controller provides a unified interface for configuration and management, eliminating the need to manually configure each access point individually. The controller translates high-level management commands into specific configuration actions for individual access points, thereby simplifying operations while managing complex multi-AP deployments.
Solution Approach 2:
The system architecture is segmented into two distinct functional components: a centralized controller for management functions and distributed access points for wireless service delivery. This segmentation allows the complex task of managing multiple APs to be handled by the controller, while individual APs focus on providing wireless access, thereby improving overall ease of operation.
2Loss of information
If standalone access points with full routing functions are used, then device visibility is hidden, but network functionality is maintained
Solution Approach 1:
The routing and NAT functions that hide device visibility are extracted from the access points and relocated to a separate network infrastructure component. This extraction allows access points to operate in a mode that maintains device visibility while still providing wireless access functionality. The separated routing function can then provide value-added services without compromising visibility.
Solution Approach 2:
A centralized controller acts as an intermediary that maintains device visibility while enabling value-added services. The controller can monitor and manage devices without requiring the access points to perform NAT functions, thereby preserving visibility information while still providing comprehensive network services through the controller's management capabilities.
3Device complexity
If hierarchical architecture with Wireless Access Controller is implemented, then centralized management is achieved, but scalability is limited to a few hundred access points
Solution Approach 1:
The architecture transitions from a traditional hierarchical model to a flat, distributed architecture inspired by cloud computing principles. Instead of a single centralized controller managing all access points in a hierarchical structure, the system adopts a dimensionally different approach where multiple controllers can operate in a distributed manner, enabling linear scalability to support millions of devices across thousands of access points without the single-point-of-failure limitation.
Solution Approach 2:
The controller architecture is designed with universal functionality that can be distributed across multiple instances. Each controller can independently manage a portion of the access point population, and the system as a whole achieves centralized management capabilities through the collective action of multiple controllers. This multi-functional distribution enables scalability to millions of devices while maintaining centralized management benefits.
4Ease of operation
If Wireless Access Controllers are deployed for centralized management, then configuration control is improved, but cost increases and single point of failure risk remains
Solution Approach 1:
The system implements local quality by distributing controller functions across multiple independent controller instances rather than relying on a single centralized controller. Each controller instance can independently provide centralized configuration control for its managed access points, and the local decision-making capability at each controller level eliminates the single point of failure while maintaining centralized management benefits through coordinated operation of multiple controllers.
Data Source
AI summary
Described herein are techniques for providing centrally managed Wi-Fi using internet protocol (IP) connections between a central Wi-Fi access gateway and one or more radio nodes. The Wi-Fi access gateway establishes an IP connection with a radio node across a wide area network, wherein the radio node is configured to wirelessly connect to one or more Wi-Fi devices located near the radio node. The Wi-Fi access gateway receives Layer 2 data traffic over the IP connection, wherein the Layer 2 data traffic is associated with a Wi-Fi device from the one or more Wi-Fi devices connected to the radio node. The Wi-Fi access gateway controls one or more Wi-Fi services for the Wi-Fi device based on the Layer 2 data traffic so that the Wi-Fi access gateway can provide centrally managed Wi-Fi for the Wi-Fi device.