Optical Transmission Device Bandwidth Allocation Timing Adjustment
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Solution Overview
Problem
The existing method for reducing delay in bandwidth allocation in TDM-PON systems does not account for the timing of resource information calculation and registration, leading to waiting time until new resource information is reflected in bandwidth allocation.
Innovation Solution
An optical transmission device with a timing adjuster that calculates and applies a correction time to align the timing of bandwidth request information storage and reading, reducing waiting time by adjusting the reading period based on the difference between storage and reading times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal station device receives resource information from an upper device and uses it to generate GATE signals, then the bandwidth allocation efficiency is improved, but a waiting time occurs until the resource information is reflected in the bandwidth allocation to the termination device
Solution Approach 1:
The terminal station device stores resource information in advance in a storage unit before it is actually needed for bandwidth allocation. By pre-receiving and pre-storing the resource information when it is transmitted from the upper device, the system eliminates the waiting time that would otherwise occur when the resource information needs to be processed for bandwidth allocation. This preliminary action ensures that when bandwidth allocation needs to be updated, the resource information is already available immediately.
2Ease of operation
If REPORT and GATE signals are exchanged between terminal station device and termination device, then bandwidth allocation control is achieved, but transmission delay occurs in the uplink signal
Solution Approach 1:
The terminal station device generates and stores GATE signals in advance based on pre-received resource information, before the termination device actually needs to transmit uplink signals. This preliminary generation and storage of GATE signals eliminates the need for real-time signal exchange during transmission, thereby reducing the transmission delay of uplink signals while maintaining proper bandwidth allocation control.
Solution Approach 2:
The patent introduces a storage unit as an intermediary component that holds both resource information and generated GATE signals. This storage unit acts as a buffer between the upper device and the termination device, allowing the system to decouple the bandwidth allocation control function from the real-time signal exchange, thereby reducing transmission delay while maintaining control effectiveness.
Data Source
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AI summary
An optical transmission device includes a bandwidth allocator that periodically reads bandwidth request information indicating a bandwidth required for a termination device to transmit an uplink signal from a storage and allocates a bandwidth to the termination device on the basis of the read bandwidth request information, and a timing adjuster that adjusts a period at intervals of which the bandwidth allocator reads the bandwidth request information from the storage on the basis of the timing at which resource information used to generate the bandwidth request information is received from an upper device.