Mobility Access Gateway Seamless WLAN Handover
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Solution Overview
Problem
Conventional systems do not support seamless transitions between private and public WLANs, leading to transient interruptions in mobile node connectivity when roaming outside the private WLAN's signal range.
Innovation Solution
Establishing a privileged access channel through a Mobility Access Gateway (MAG) and using Dual Stack Lite Tunnels with IPv4 and IPv6 addresses to maintain continuous connectivity by associating mobile nodes with the same MAG across different access points, ensuring seamless handovers between private and public WLANs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mobile node switches from private WLAN to public WLAN, then the mobile node can maintain network access outside home range, but the transition causes transient service interruption
Solution Approach 1:
The system performs preliminary actions by establishing a privileged access channel through the Mobility Access Gateway before the actual handover occurs. The MAG maintains a persistent IPsec tunnel that is pre-configured and ready, so when the mobile node switches access points, the tunnel is already in place to carry traffic seamlessly. This preliminary setup eliminates service interruption during transitions between private and public WLANs.
Solution Approach 2:
The Mobility Access Gateway acts as an intermediary between the mobile node and the network. It maintains a persistent IPsec tunnel that mediates all traffic during handovers, abstracting the complexity of wireless transitions from the mobile node. The MAG's tunnel endpoint remains stationary while the mobile node moves between access points, providing a stable communication path that ensures service continuity during transitions.
2Ease of operation
If conventional systems allow switching between private and public WLANs, then mobile nodes can roam outside signal range, but the switching process causes service interruption
Solution Approach 1:
The system ensures continuity of useful action by maintaining a persistent IPsec tunnel through the Mobility Access Gateway that remains active during the entire handover process. As the mobile node moves between access points, the tunnel continues to carry traffic without breaking, ensuring that voice calls, data transfers, and other services continue uninterrupted. This eliminates idle time during transitions and maintains continuous network connectivity.
3Reliability
If seamless handover is implemented between WLANs, then service continuity is maintained, but network infrastructure complexity increases
Solution Approach 1:
The Mobility Access Gateway is designed as a universal platform that handles multiple functions: it manages IPsec tunnel establishment, maintains persistent connections, performs authentication, and supports handovers between different types of access points (private and public WLANs). This multi-functionality consolidates what could be multiple separate systems into a single gateway, managing complexity while ensuring service continuity across diverse wireless environments.
Data Source
AI summary
Seamless mobility between public and private WLANs may be provided. First a Mobile Node (MN) may be registered for privileged network access via a first access point (AP). Then, a privileged access channel for the MN via a first Mobility Access Gateway (MAG) may be established. Next, a switch by the MN from the first AP to a second AP may be detected. A determination may be made as to whether the second AP is associated with one of the following: the first MAG and a second MAG. Then, when the second AP is associated with the first MAG, the second AP may be established as a new termination point for the privileged access channel. When the second AP is associated with the second MAG, a new privileged access channel may be established through the second MAG.