Optical Network Unit Activation Timing for Lower Power Consumption
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Solution Overview
Problem
In optical communication systems, optical network units (ONUs) in a sleep state experience wasteful power consumption due to the need to wait for activation completion before data transmission can begin, necessitating a reduction in this waiting time to minimize power consumption.
Innovation Solution
The ONU transitions to an activation state upon receiving an activation signal, notifies the optical line terminal (OLT) of the activation time required, and the OLT initiates data transmission after the elapsed activation time, eliminating the need for the ONU to wait for a completion notification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ONU waits for activation completion notification before data transmission, then activation reliability is ensured, but power consumption increases due to waiting time
Solution Approach 1:
The ONU performs activation processing in advance when receiving the first activation signal, determines the activation time beforehand, and notifies the OLT of this predetermined time. This allows the OLT to start data transmission at the appropriate time without requiring the ONU to wait for a completion notification, thereby reducing power consumption while ensuring reliable activation
2Reliability
If the ONU waits for activation completion notification before data transmission, then data transmission reliability is ensured, but time efficiency deteriorates due to waiting time
Solution Approach 1:
The activation time is determined and notified in advance during the first activation process. The OLT uses this predetermined activation time to start data transmission at the appropriate moment, eliminating the need for the ONU to wait for a completion notification while ensuring data transmission reliability is maintained
3Measurement precision
If the OLT waits for activation completion notification before starting data transmission, then transmission timing accuracy is ensured, but system efficiency decreases due to waiting time
Solution Approach 1:
The activation time is determined and notified in advance during the first activation process. The OLT uses this predetermined activation time to start data transmission at the appropriate moment, eliminating the need to wait for a completion notification while maintaining transmission timing accuracy
Solution Approach 2:
The ONU notifies the OLT of the activation time determined during activation processing. This feedback mechanism allows the OLT to accurately determine when to start data transmission without requiring the ONU to wait for a completion notification, thereby improving system efficiency while maintaining timing accuracy
Data Source
AI summary
An aspect of the present invention is an optical communication system in which an optical line terminal and an optical network unit are connected by an optical communication line, in which when receiving a first activation signal from the optical line terminal in a sleep state, the optical network unit executes activation processing for transition from the sleep state to an activation state and notifies the optical line terminal of an activation time that is a time required for executing the activation processing, and the optical line terminal transmits the activation signal at a time of transmission of second and subsequent activation signals, and then the optical line terminal starts data transmission to the optical line terminal after elapse of the activation time a notification of which has been given from the optical network unit.