SDN Mobile Terminal Handover via Temporary Path Setup
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Solution Overview
Problem
Conventional SDN-based networks face challenges in supporting terminal mobility in mobile communication networks, leading to packet loss and increased delay due to the lack of preparation for terminal movement, especially when real-time path changes are required.
Innovation Solution
A method and device for supporting terminal mobility in a distributed mobile network based on SDN, which defines message exchange procedures for fast handovers between wireless access points, allowing for temporary route setup before terminal movement, minimizing packet loss by determining fast handover triggers based on signal strength and movement history.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If real-time path change is implemented when terminal moves in conventional SDN-based network, then the terminal can maintain connectivity, but packet loss occurs and delay increases due to lack of preparation for mobility
Solution Approach 1:
The patent applies preliminary action by establishing a temporary path before the terminal actually moves. The source eNB sets up a temporary forwarding path to the target eNB in advance, so that when the terminal handover is triggered, data can be immediately forwarded without waiting for path establishment, thus eliminating packet loss and delay while maintaining connectivity.
2Productivity
If fast handover is implemented without controller intervention, then handover speed increases, but network control and management become more complex
Solution Approach 1:
The patent applies segmentation by dividing the handover control into two parts: fast handover execution at the eNB level (source and target eNBs directly establish temporary path and forward data) and periodic path optimization through the SDN controller. This segmentation enables fast handover without controller intervention while maintaining overall network control, resolving the contradiction between handover speed and control complexity.
3Reliability
If temporary path is established before terminal movement, then packet loss is minimized, but network resources are consumed
Solution Approach 1:
The patent applies partial action by establishing temporary paths only for terminals that are actually moving, rather than for all terminals. The source eNB determines handover triggers based on terminal movement detection, and only then sets up temporary paths. This selective approach minimizes packet loss for moving terminals while avoiding unnecessary resource consumption for stationary terminals.
Data Source
AI summary
A method and a system for supporting mobility of a mobile terminal in a distributed mobile network based on a SDN are disclosed. A method of supporting a fast handover of a mobile terminal in a node-B (eNB) includes the steps of: receiving a handover initiation message from the mobile terminal, the handover initiation message including identification information and signal strength of a target eNB; determining whether or not for a fast handover trigger using the signal strength of the target eNB and movement history of the mobile terminal previously stored; and when it is determined as the fast handover trigger, transmitting a handover request message and a rule for the handover to the target eNB by using the identification information of the target eNB.