Downstream Frame Transfer Device for PON Delay Control
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Solution Overview
Problem
In communication systems with PON configuration, existing OLT-side transfer devices struggle to distribute downstream frames in accordance with actual traffic volume, leading to order-controlled delays and failure to meet strict delay requirements, especially when frame output speeds vary among host devices.
Innovation Solution
A downstream frame transfer device with a frame information acquisition unit, frame storage unit, and distribution control determination unit that calculates statistical values of frame input and determines the number of frames to be input into queues based on these values to ensure frames are distributed across multiple OLTs, satisfying desired delay requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple PONs are parallelized using multiple wavelengths to increase optical communication speed, then the frame transfer bandwidth is improved, but the frame order control becomes more difficult and order-controlled delays occur
Solution Approach 1:
The patent segments the frame distribution process by creating separate queues for each OLT (Queue 1, Queue 2, etc.) and assigning specific wavelengths to each queue. This segmentation allows independent control of frame distribution across multiple parallel PONs while maintaining order control through wavelength-specific queue management.
Solution Approach 2:
The patent implements feedback mechanisms where the frame distribution control unit monitors the actual frame output speeds of host devices and adjusts the distribution accordingly. The control unit calculates statistical values of frame input and uses this feedback to dynamically determine the number of frames to input into each queue, ensuring frames are distributed in accordance with actual traffic volume while maintaining order.
2Device complexity
If existing OLT-side transfer devices distribute downstream frames using conventional methods, then the device complexity is reduced, but the frames cannot be distributed in accordance with actual traffic volume leading to delay requirement failures
Solution Approach 1:
The patent introduces dynamic adjustment capabilities where the frame distribution control unit calculates statistical values of frame input from host devices and dynamically determines the number of frames to input into each queue based on actual traffic volume. This dynamic approach allows the system to adapt to varying traffic conditions while satisfying delay requirements.
Solution Approach 2:
The patent changes the distribution parameters by calculating statistical values (average frame input, maximum frame input) and using these parameters to determine the number of frames to input into each queue. This parameter-based control enables precise distribution according to actual traffic volume, improving reliability while maintaining manageable device complexity through structured queue management.
Data Source
AI summary
A transfer device installed between a host device and a plurality of OLTs in a communication system to which a network with a PON configuration including the plurality of OLTs between the host device and a subordinate device is applied, the transfer device including a frame information acquisition unit configured to monitor downstream frames input from the host device and calculate a statistical value of the downstream frames per a predetermined fixed cycle, a frame storage unit including a plurality of queues each configured to store downstream frames to be transferred to the plurality of OLTs, the frame storage unit configured to store the downstream frames input from the host device, a frame sorting unit configured to input the downstream frames to the plurality of queues in the frame storage unit, and a distribution control determination unit configured to determine the number of frames to be sequentially input by the frame sort unit to the plurality of queues based on the statistical value.