G.709 Gateway Multi-Stage Multiplexing Routing Control
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Solution Overview
Problem
The integration of ODU0 and ODUflex signals into existing OTN networks poses interoperability challenges due to differences in tributary sequence support between old and new devices, requiring network upgrades that can be costly and disruptive.
Innovation Solution
Implementing a G.709-based multi-stage multiplexing routing control method and gateway network element that broadcasts its multi-stage multiplexing capability through an extended routing protocol, allowing for the configuration and management of optical transport networks, enabling ODU0 and ODUflex support without upgrading all nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all network nodes are upgraded to support ODU0 and ODUflex signals, then network adaptability and service capability are improved, but network deployment cost and complexity increase significantly
Solution Approach 1:
The patent introduces a gateway network element as an intermediary component that supports multi-stage multiplexing. This gateway acts as a bridge between traditional OTN networks and new ODU0/ODUflex services, allowing incremental deployment without requiring all nodes to be upgraded simultaneously. The gateway performs the complex mapping and multiplexing functions centrally, while other network elements can remain unchanged.
2Adaptability or versatility
If all network nodes are upgraded to support ODU0 and ODUflex signals, then network adaptability is improved, but deployment time and operational disruption increase
Solution Approach 1:
The patent segments the network upgrade process by introducing a gateway network element that handles ODU0 and ODUflex multiplexing separately from the core OTN network. This allows the network to be divided into traditional segments and new service segments, enabling phased deployment where only the gateway needs to be upgraded initially, while other nodes can continue operating with existing capabilities.
3Device complexity
If traditional single-stage multiplexing is used, then device complexity is reduced, but the ability to support new signal types (ODU0, ODUflex) is limited
Solution Approach 1:
The patent implements nested multiplexing structures where ODU0 and ODUflex signals are first mapped to intermediate containers (ODU1 or ODU2), which are then multiplexed into higher-order containers (ODU3 or ODU4). This nested approach allows new signal types to be supported within the existing hierarchical framework, maintaining compatibility with traditional single-stage multiplexing while enabling new capabilities through intermediate mapping stages.
Data Source
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AI summary
A G.709 based multi-stage multiplexing routing control method and a gateway network element. The method comprises: a gateway network element broadcasting multi-stage multiplexing capability of the gateway network element to a routing domain where the gateway network element is located or a path calculation entity through an extended routing protocol, so as to implement multi-stage multiplexing configuration and management of an optical transport network through the gateway network element; the multi-stage multiplexing capability comprises information of multiplexing hierarchy supported by a port of a link connected to the gateway network element and adaptation ability.