Tunneling Endpoint Apparatus for Roaming Wireless Clients
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Solution Overview
Problem
Existing network technologies face challenges in providing seamless mobility for wireless devices across different access switches while maintaining their Internet Protocol (IP) addresses and default routers, leading to disruptions in service and management complexity.
Innovation Solution
A hierarchical mobility architecture is implemented, utilizing mobility controllers and tunneling endpoint apparatus to establish and manage tunnels between access switches, ensuring that wireless devices can roam seamlessly within and across mobility sub-domains without changing their IP addresses or default routers, and providing a unified management framework for both wired and wireless clients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless devices roam between access switches using traditional networking, then mobility is achieved, but IP address changes and service disruptions occur
Solution Approach 1:
The patent introduces a mobility controller as an intermediary component that manages roaming between access switches. The mobility controller maintains IP address binding and routes traffic through tunneling endpoints, allowing devices to roam without changing IP addresses. This mediator resolves the contradiction by decoupling the physical movement of devices from their logical network identity.
Solution Approach 2:
The patent segments the network into mobility domains and sub-domains with distributed controllers managing each segment. This segmentation allows local roaming to be handled independently within sub-domains while maintaining overall network coherence, enabling seamless mobility without service disruption across the entire network.
2Productivity
If distributed wireless controller system is implemented, then network scalability is improved, but system complexity increases
Solution Approach 1:
The system divides the wireless controller functionality into distributed controllers organized in a hierarchical structure with mobility domains and sub-domains. Each controller manages a specific segment, enabling the network to scale by simply adding more segments rather than increasing the capacity of a single centralized controller.
Solution Approach 2:
The mobility controller is designed as a universal platform that can function at multiple levels of the hierarchy (mobility domain and sub-domain levels). This multi-functionality reduces complexity by using the same controller design throughout the network rather than requiring different types of controllers for different scales.
3Reliability
If seamless roaming without IP address change is implemented, then service continuity is maintained, but network infrastructure complexity increases
Solution Approach 1:
The mobility controller acts as an intermediary that maintains IP address bindings and manages tunneling endpoints. This intermediary absorbs the infrastructure complexity, allowing the rest of the network to see simple, static IP addresses while the complex roaming management is handled transparently by the mobility controller.
Solution Approach 2:
The patent creates virtual copies of network interfaces and IP address bindings in the mobility controller. When a device roams, the mobility controller maintains a copy of the device's network identity and routes traffic through appropriate tunneling endpoints, allowing service continuity without requiring physical reconfiguration of network infrastructure.
4Ease of operation
If unified management for wired and wireless clients is provided, then ease of operation is improved, but integration complexity increases
Solution Approach 1:
The mobility controller is designed as a universal management platform that handles both wired and wireless clients through the same interface and protocols. This multi-functionality enables unified management operations while the internal architecture handles the integration complexity of different client types through standardized abstractions.
Data Source
AI summary
Techniques are provided to support roaming of wireless devices in a network such that the wireless devices can keep their Internet Protocol (IP) addresses as they roam within and across mobility sub-domains. When a wireless device roams from one access switch to another access switch, a tunneling endpoint apparatus in the wireless device's home mobility sub-domain is configured to serve as the point of presence for the roamed wireless device. Traffic for the roamed wireless device is tunneled from the access switch where the wireless device has roamed (where it is currently attached) to the tunneling endpoint apparatus. When the wireless device roams across mobility sub-domains, then traffic is tunneled from the access switch where the wireless device is currently attached to the tunneling endpoint apparatus in that mobility sub-domain (called a “foreign” mobility sub-domain) to the tunneling endpoint apparatus in the wireless device's home mobility sub-domain.