Tributary Slot Migration for OTN Bandwidth Fragmentation
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Solution Overview
Problem
In optical transport networks (OTNs), the existence of tributary slot fragments in OTUCn signals reduces the utilization of network bandwidth resources due to random occupation of low-order services, making it difficult to allocate bandwidth effectively.
Innovation Solution
A data migration method that determines idle tributary slots in an OPUCn signal and migrates low-order ODU services from occupied slots to idle slots, using a Generic Mapping Procedure (GMP) and a migration protocol to ensure efficient slot utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If low-order services occupy tributary slots randomly in OPUCn signal, then service flexibility is improved, but network bandwidth resource utilization deteriorates due to tributary slot fragments
Solution Approach 1:
The patent implements dynamic tributary slot allocation through a migration mechanism. The network node continuously monitors tributary slot usage and dynamically migrates low-order ODU services from occupied slots to idle slots, transforming the static random occupation pattern into a dynamic optimization process that eliminates fragmentation while preserving service flexibility
Solution Approach 2:
The patent changes the parameter of tributary slot assignment from random static allocation to dynamically optimized allocation. By modifying the assignment pattern through migration operations, the system transitions from a state with fragmentation to a state where slots are consolidated, improving resource utilization without sacrificing the ability to accommodate various service types
2Adaptability or versatility
If tributary slot fragments exist in OPUCn signal, then service allocation flexibility is maintained, but bandwidth resource efficiency deteriorates
Solution Approach 1:
The patent extracts the fragmentation problem by identifying and isolating occupied tributary slots from the overall signal structure. The migration mechanism selectively targets and moves services from fragmented occupied slots to consolidated idle slots, separating the problem of fragmentation from the overall resource allocation to enable efficient resolution
3Stability of the object's composition
If fixed rate levels are used in OTN, then network stability is improved, but adaptability to varying service traffic deteriorates
Solution Approach 1:
The patent introduces dynamic slot migration capability that allows the network to adapt to varying service traffic patterns while maintaining the stable OTN framework. The migration mechanism enables real-time reconfiguration of tributary slot assignments in response to changing traffic demands, transforming a static fixed-rate system into a dynamically adaptable one
Data Source
AI summary
Embodiments of the present invention provide a data migration method and a communications node. The method includes: determining, by a first node in an OPUCn signal, a second tributary slot corresponding to a first tributary slot, where the second tributary slot is an idle tributary slot; and migrating, by the first node, a first low-order ODU service from the first tributary slot to the second tributary slot. In the embodiments of the present invention, by migrating, in an OPUCn signal, a first low-order ODU service of a first tributary slot to an idle second tributary slot, the existence of tributary slot fragments can be avoided, thereby improving utilization of network bandwidth resources.