Control Channel Establishment in Intelligent Optical Networks
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Solution Overview
Problem
In intelligent optical network systems using ASON with a distributed architecture, the hop-by-hop IP forwarding mechanism leads to slow message sending speeds due to DCN routing convergence, routing table search speed, and IP packet congestion, affecting network performance.
Innovation Solution
A method for establishing a control channel that involves a controller sending a control link discovery message to a peer node, obtaining bandwidth information, and selecting an idle resource-rich control link to create a direct control channel through cross-connection of subchannels, improving message sending speed and network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hop-by-hop IP forwarding mechanism is used to transfer control messages, then the controller can communicate with all nodes through DCN routing, but the message sending speed becomes slow due to routing convergence, routing table search, and IP packet congestion
Solution Approach 1:
The patent pre-establishes a control channel between the controller and each node before actual control message transmission is needed. This preliminary action includes discovering control links, selecting optimal paths, and setting up dedicated subchannels, so that when control messages need to be sent, they can immediately use the pre-configured channel without undergoing routing convergence and table search delays
Solution Approach 2:
The patent extracts the control channel establishment process from the general DCN routing mechanism. By separating control plane communication from data plane routing, the system creates a dedicated control channel that operates independently from the hop-by-hop IP forwarding mechanism, thereby eliminating the performance bottlenecks associated with routing table searches and convergence
2Adaptability or versatility
If multiple IP packets are used for simultaneous message transmission between controller and multiple nodes, then comprehensive communication coverage is achieved, but IP packet congestion occurs which further affects message sending speed
Solution Approach 1:
The patent segments the control channel into multiple subchannels, where each subchannel can independently carry control messages to different nodes. This segmentation allows parallel message transmission without IP packet congestion, as each subchannel operates as an independent transmission path. The controller can simultaneously send messages to multiple nodes through different subchannels, maintaining high productivity while achieving comprehensive communication coverage
Data Source
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AI summary
Embodiments of the present invention relate to the field of communications, and provide a method, an apparatus, and a system for establishing a control channel, so that in a centralized control mode, a control channel may be established between a controller and a destination node. The method includes: obtaining, by a controller, a control link notification message of each control link in an entire network and bandwidth information of a control channel; and obtaining, through calculation according to the control link notification message of each control link and the bandwidth information of the control channel, routing information of the control channel between the controller and a destination node, and sending these information to an intermediate node, so that the intermediate node in the routing information of the control channel establishes the control channel between the controller and the destination node.