Optical Network Control Channel Reliability via Container Payload Segmentation
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Solution Overview
Problem
Optical transmission systems, such as Metro-Ethernet transport systems, face challenges in providing a reliable and efficient control channel within the network, as existing methods rely on external networks or require separate wavelength allocation, which can lead to inefficiencies and failures in managing control messages, especially in geographically distributed nodes.
Innovation Solution
The method involves transmitting control messages within the payload portion of containers using a modular FEC design, where control data is encoded separately from client data, allowing independent decoding and processing, and can be included in any available container, enabling efficient and reliable control message transmission without the need for a separate control channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control messages are transmitted using external networks or separate wavelength allocation, then control channel reliability is improved, but network complexity and resource overhead increase
Solution Approach 1:
The patent merges the control channel with the data plane by transmitting control messages within the payload portion of existing containers that carry client data packets. This eliminates the need for separate wavelength allocation or external control networks, reducing network complexity while maintaining reliability through the existing robust container transmission mechanism.
Solution Approach 2:
The container payload structure is designed to serve multiple functions: it can carry client data packets, control messages, or both simultaneously. The payload portion acts as a universal transport medium that adapts its content based on network needs, eliminating the requirement for dedicated control channel infrastructure.
2Loss of energy
If control data is transmitted within the payload portion of containers, then bandwidth efficiency is improved, but control message reliability may worsen due to shared transmission medium
Solution Approach 1:
The patent segments the payload portion into distinct areas: one for client data packets and another for control messages. This segmentation allows independent handling and processing of control data separate from client data, enabling reliable control message transmission while maintaining bandwidth efficiency through shared container utilization.
Solution Approach 2:
The container structure itself acts as an intermediary that protects and transports control messages. By embedding control messages within the container payload and utilizing the existing container error correction and protection mechanisms, the system ensures control message reliability while benefiting from the efficient bandwidth utilization of shared transmission.
3Reliability
If separate FEC encoding is used for control data and client data, then error protection reliability is improved, but processing complexity increases
Solution Approach 1:
The patent applies separate Forward Error Correction (FEC) encoding to control data and client data independently. This segmentation of error protection mechanisms ensures that control messages receive dedicated error protection tailored to their reliability requirements, while client data receives appropriate protection levels, maximizing overall system reliability.
Solution Approach 2:
Different FEC encoding schemes and protection levels are applied locally to different data types within the same container. Control messages receive enhanced error protection since they are critical for network operation, while client data receives standard protection, optimizing resource allocation and processing efficiency based on local quality requirements.
4Productivity
If control messages are included in any available container, then transmission efficiency is improved, but latency control becomes more difficult
Solution Approach 1:
The patent reserves specific areas within the container payload structure for control messages in advance. This preliminary allocation ensures that when control messages need transmission, they can be immediately inserted into pre-designated spaces without requiring complex real-time container search or allocation, maintaining high transmission efficiency while enabling predictable latency control.
Data Source
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AI summary
The present document relates to a method for providing control messages to one or more nodes (110a, 110b, 110c) included in an optical transmission network by transmitting containers (200) between the nodes (110a, 110b, 110c), each container (200) comprising a container header (210) and a container payload portion (220), wherein the container header (210) comprises at least information regarding a destination node of the container (200) and wherein the container payload portion (220) includes one or more data portions comprising information associated with one or more client data packets, the method comprising the steps of: - receiving (S610), at a node (110a, 110b, 110c), a container (200) comprising a container payload portion (220) including one or more data portions and a control data portion, the control data portion associated with a control message and a forward error correction (FEC) information in order to protect the control message against transmission errors; - decoding (S620) the control data portion based on the FEC information; - providing (S630) the control message included in the decoded control data portion at said node (110a, 110b, 110c); and - optionally forwarding (S640) the container (200) to a downstream node.