OSU Bandwidth Adjustment via Synchronous Node Coordination
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Solution Overview
Problem
The existing bandwidth adjustment process for Optical Transport Networks (OTN) is complex and results in significant bandwidth waste when carrying fine-granularity services, such as Fast Ethernet and E1 services, due to the minimum time slot granularity of 1.25G.
Innovation Solution
A bandwidth adjustment method, apparatus, and system that involves a source node receiving an adjustment command from a network management server, entering an adjustment mode, and performing adjustments on the forward transmission bandwidth parameter of an Optical Service Unit (OSU). This method is synchronized across multiple nodes, including intermediate and sink nodes, using message passing and adjustment modes to ensure efficient bandwidth allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the minimum time slot granularity of 1.25G is adopted to carry services, then the OTN transmission is simplified, but the bandwidth waste becomes very serious
Solution Approach 1:
The patent divides the 1.25G time slot into smaller granularities by introducing byte interpolation technology. This allows services with bandwidth less than 1.25G (such as E1 services with 2M bandwidth) to be segmented and carried in only the necessary portion of the time slot, rather than occupying the entire 1.25G slot. The byte interpolation mechanism enables fine-grained allocation of bandwidth resources, reducing the bandwidth waste from 99% to a much lower level while maintaining the simplicity of OTN transmission framework.
2Adaptability or versatility
If byte interpolation is used to carry multiple service signals in payload time slots, then fine-granularity services can be carried, but the bandwidth adjustment process becomes complicated
Solution Approach 1:
The patent introduces a dynamic bandwidth adjustment mechanism that allows the bandwidth allocation to be flexibly changed based on actual service requirements. The system can dynamically enter an adjustment mode corresponding to Optical Service Unit (OSU) when bandwidth changes are needed, perform adjustments on the forward transmission bandwidth parameter, and exit the adjustment mode after completion. This dynamic approach simplifies the bandwidth adjustment process compared to static configurations, enabling efficient adaptation to varying service demands while maintaining fine-granularity service carrying capability.
3Device complexity
If synchronous adjustment mode is implemented across all nodes, then the bandwidth adjustment process is simplified, but coordination between multiple nodes is required
Solution Approach 1:
The patent implements a feedback-based synchronous adjustment mechanism where a source node initiates bandwidth adjustments by sending first messages to downstream nodes, and sink nodes confirm adjustments by returning second messages to upstream nodes. All nodes along the transmission path coordinate their bandwidth adjustments synchronously based on these message exchanges. The feedback loop ensures that all nodes are aligned in the adjustment process, simplifying the overall bandwidth adjustment procedure while automatically handling the coordination requirements through structured message passing between source, intermediate, and sink nodes.
Data Source
AI summary
A bandwidth adjustment method is disclosed. The source node receives an adjustment command issued by a network management server, all nodes on the path are triggered to adjust a forward transmission bandwidth parameter of the Optical Service Unit (OSU) respectively, so the network management server does not need to issue adjustment commands to all the nodes on the path, thereby simplifying the process of the bandwidth adjustment. Further, the source node enters an adjustment mode corresponding to the OSU, and sequentially sends the first message to the downstream node until the sink node, so that each node on the path enters the adjustment mode corresponding to OSU, and then exits the adjustment mode corresponding to the OSU after performing corresponding adjustment on the forward transmission bandwidth parameter of the OSU, thereby realizing a synchronous adjustment of all nodes on the path based on the adjustment mode corresponding to the OSU.