OpenFlow Controller Handover in SDN Mobile IPv6
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Solution Overview
Problem
Proxy Mobile IPv6 experiences performance deterioration and congestion due to traffic concentration on central control units, leading to potential packet loss during handover, especially in real-time applications.
Innovation Solution
An OpenFlow controller is introduced to support handover in Proxy Mobile IPv6 environments using a software-defined network, which includes a storage device for handover policies and a processor that selects a new mobile access gateway, sends messages to involved gateways and mobility anchors to reroute data packets, thereby reducing handover latency and packet loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Proxy Mobile IPv6 uses a centralized localized mobility anchor for handover management, then mobility support is improved, but network congestion and performance deterioration occur due to traffic concentration
Solution Approach 1:
The patent segments the centralized mobility management function into distributed components. Mobile access gateways are equipped with local mobility binding caching capabilities, allowing them to independently handle handover decisions and packet forwarding without all traffic passing through the centralized localized mobility anchor. This distributes the control plane functions across multiple nodes, reducing traffic concentration while maintaining mobility support.
2Reliability
If handover is performed in conventional Proxy Mobile IPv6, then mobile node mobility is supported, but packet loss occurs due to handover latency in real-time applications
Solution Approach 1:
The patent implements preliminary binding update actions before actual handover occurs. The mobile access gateway pre-establishes binding information with target gateways and caches mobility bindings in advance. When handover is triggered, the gateway can immediately switch packet forwarding paths using pre-computed routing information, significantly reducing handover latency and preventing packet loss in real-time applications.
Data Source
AI summary
The openflow controller include a storage device that stores an application to performing a handover based on a handover policy; and a processor that executes the application stored in storage device; wherein in response to execution of the application, the processor decides handover of the mobile node connected to a first mobile access gateway, and selects a second mobile access gateway as a handover target, and in order to allow a localized mobility anchor connected to the openflow controller to deliver data packets to the mobile node through the second mobile access gateway, instead of the first mobile access gateway, the processor sends a message to each of the first mobile access gateway, the second mobile access gateway, and the localized mobility anchor in response the handover policy.