Service Container Resizing Across OSU Frames for Rapid OTN Changes
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Solution Overview
Problem
Current optical transport networks (OTN) lack fast bandwidth resizing capabilities, particularly in scenarios where service requirements necessitate rapid adjustments, as existing methods only allow for one byte to be resized every 125 microseconds.
Innovation Solution
A bandwidth resize method and apparatus that adjusts the size of service containers by setting a first indication in data unit frames to indicate a bandwidth resize location, allowing for simultaneous resizing of bandwidth across multiple frames, and utilizes a second indication to manage network nodes and prevent FIFO overflow or underflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If one byte is resized every 125 microseconds, then bandwidth resizing is performed with fine granularity, but bandwidth resize rate is slow
Solution Approach 1:
The patent applies preliminary action by pre-calculating and indicating the bandwidth resize location in advance using a first indication field in the data unit frame. This allows the network node to prepare for the bandwidth change before it actually occurs, enabling faster switching without gradual step-by-step adjustments. The resize location is marked ahead of time, so when the indicated position is reached, the bandwidth can immediately switch from first bandwidth to second bandwidth without delay.
2Productivity
If bandwidth is resized rapidly across multiple frames, then bandwidth resize rate improves, but buffer overflow or underflow may occur
Solution Approach 1:
The patent implements feedback by introducing a second indication field that carries information about the quantity of network nodes and buffer status. This feedback mechanism allows the system to monitor buffer conditions and adjust the bandwidth resizing process accordingly. The network nodes can use this feedback information to coordinate their buffering actions, ensuring that rapid bandwidth changes do not cause overflow or underflow conditions.
Solution Approach 2:
The patent applies beforehand cushioning by using the second indication to pre-configure buffer allocation and network node coordination before rapid bandwidth resizing occurs. This cushioning mechanism ensures that buffers are properly sized and positioned to handle the upcoming bandwidth change, preventing overflow or underflow conditions during the transition.
3Manufacturing precision
If a first indication is set to indicate bandwidth resize location, then bandwidth resizing precision improves, but frame structure complexity increases
Solution Approach 1:
The patent applies local quality by introducing bandwidth resize indication information only in specific locations within the frame structure (in the overhead area of data unit frames) rather than throughout the entire frame. This localized approach provides precise bandwidth resize location information where needed without unnecessarily complicating the entire frame structure. The first indication is placed strategically in the overhead area to indicate the resize location with minimal impact on overall frame design.
Data Source
AI summary
A size of a service container is adjusted with bandwidth (or a rate) of an optical service unit (OSU) frame. When determining that bandwidth of service data needs to be resized, a source node updates a value of a first indication in a data unit frame to indicate a bandwidth resize location, and may further determine an actual start location of bandwidth changing based on the bandwidth resize location, to map a part that is in the data unit frame and that is located before the actual start location to a service container before resizing, and map a part that is in the data unit frame and that is located after the actual start location to a service container before resizing.