SDN Controller Flow Segmentation for Handover Optimization
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Solution Overview
Problem
In SDN-based networks, the increasing number of active flows leads to elevated signaling costs and handover delays during mobile node handovers, particularly for real-time services, as existing systems incur significant recalculations and reconfigurations, making it difficult to provide continuous service.
Innovation Solution
The method involves distinguishing flow types in a router solicitation message and allocating prefixes accordingly, allowing the SDN controller to prioritize handovers for flows requiring session maintenance, thereby reducing signaling costs and handover delays by processing only critical flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the SDN controller recalculates and configures routes for all flows during handover, then route accuracy is improved, but signaling cost and handover delay increase
Solution Approach 1:
The patent segments flows into different types (first type flows that do not require session maintenance and second type flows that require session maintenance) and applies different handling strategies to each segment. During handover, only second type flows undergo full route recalculation and reconfiguration, while first type flows use simplified handling, thereby reducing overall signaling cost and handover delay while maintaining route accuracy for critical flows.
2Adaptability or versatility
If the SDN controller handles all flows equally during handover, then fairness is improved, but handover delay increases for critical services
Solution Approach 1:
The patent applies local quality by treating different flow types with different qualities of service during handover. Second type flows (requiring session maintenance) receive prioritized handling with full route recalculation, while first type flows receive simplified handling. This differentiated approach ensures that critical services maintain their performance while overall handover speed improves.
3Adaptability or versatility
If the number of active flows increases, then service diversity is improved, but signaling cost and handover delay increase
Solution Approach 1:
The patent segments the increasing number of flows into two categories based on their session maintenance requirements. By applying different processing strategies to each segment, the system can support diverse services without proportionally increasing signaling cost. First type flows consume minimal signaling resources during handover, while second type flows receive necessary attention, thereby controlling overall signaling cost despite service diversity expansion.
Data Source
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AI summary
A method for managing a mobile node of an SDN controller according to an aspect of the present disclosure includes receiving a router solicitation message of a mobile node transmitted through a first AP operated by the SDN controller.