Network Controller Dynamic Route Assignment for SD-WAN Quality
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Solution Overview
Problem
Existing SD-WAN technologies face challenges in maintaining communication quality across varying communication network states, as they cannot efficiently manage route assignments to ensure consistent quality between end terminals, leading to potential communication breakdowns due to congestion or failures in the network.
Innovation Solution
A network controller system that collects log information on communication states, determines deteriorated paths, and calculates new routes to maintain communication quality without affecting other end terminals, dynamically adjusting route assignments to ensure stable communication by utilizing available paths and minimizing changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If end terminals perform path management by measuring packet transmission and reception, then communication quality between end terminals can be maintained, but the system cannot understand detailed information about network conditions or estimate route states
Solution Approach 1:
The patent introduces a network controller as an intermediary between end terminals and the communication network. The network controller collects log information from relay apparatuses about packet transmission states, performs route determination based on this information, and manages path assignments. This intermediary enables the system to obtain detailed network state information without requiring end terminals to directly measure or understand route conditions.
2Reliability
If route assignment is dynamically changed to maintain communication quality, then communication quality can be guaranteed, but frequent changes affect other users and reduce system stability
Solution Approach 1:
The patent implements preliminary action by having the network controller collect log information about packet transmission states in advance and perform route determination before communication breakdown occurs. The controller proactively identifies deteriorating routes and switches paths before complete failure happens, thereby maintaining communication quality while avoiding frequent reactive changes that would destabilize the system.
3Reliability
If end terminals switch paths based on communication quality measurement, then packet loss can be reduced, but the system cannot estimate congestion on routes or understand where congestion occurs
Solution Approach 1:
The patent implements feedback mechanisms where relay apparatuses along the communication route send log information about packet transmission states back to the network controller. This feedback includes details about congestion conditions at different relay points. The network controller uses this feedback to identify congested routes and determine alternative paths, enabling precise detection and measurement of route congestion states without requiring end terminals to perform complex measurements.
Data Source
AI summary
An object of the present disclosure is to enable efficient route assignment that guarantees a communication quality for each path between end terminals even if a state of a communication network varies.The present disclosure is a network controller apparatus connected to a communication network that performs data communication between end terminals by using a plurality of paths. The network controller apparatus stores log information about a communication state for each path collected from the communication network, determines whether there is a path with a deteriorated communication quality on the basis of the log information, if there is a deteriorated path, determines whether there is a path in which a communication quality between end terminals utilizing the deteriorated path can be guaranteed, from among other paths available to the end terminals utilizing the deteriorated path, and if the communication quality cannot be guaranteed, calculates a new route in which the communication quality between the end terminals utilizing the deteriorated path can be guaranteed, and switches the deteriorated path to a path on the new route.