Optical Network Unit Sleep Mode Power Management
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Solution Overview
Problem
Conventional optical communication systems lack an effective power-saving operation during the sleep mode in optical network units, leading to inefficient power management.
Innovation Solution
An optical line terminal and optical network unit configuration that includes an upward band allocating unit to determine the sleep mode based on response messages and an alarm unit to manage normal operations, along with a sleep mode controlling unit to manage power states, allowing the optical network unit to conserve power by not sending response messages during sleep mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the optical network unit operates in sleep mode to save power, then power consumption is reduced, but the ability to respond to bandwidth allocation maps is lost
Solution Approach 1:
The optical network unit dynamically switches between sleep mode and active mode based on whether it has data to transmit. The unit enters sleep mode when no upward data is pending, and transitions to active mode when data arrives, allowing it to balance power savings with response capability needs
Solution Approach 2:
The OLT provides feedback through bandwidth allocation maps to indicate whether the ONU should remain active or can enter sleep mode. The ONU monitors this feedback and adjusts its operational state accordingly, creating a feedback loop that coordinates power management between the OLT and ONU
2Use of energy by moving object
If the optical transmitter is turned off during sleep mode, then power consumption is reduced, but data transmission capability is lost
Solution Approach 1:
The optical transmitter operates periodically rather than continuously. It is activated only during periods when the ONU needs to transmit data, and remains off during periods when no transmission is needed, achieving power savings while maintaining transmission capability when required
Solution Approach 2:
The transmitter state is dynamically controlled based on data arrival conditions. When upward data arrives at the ONU, the transmitter transitions from off state to on state, enabling the system to adapt transmission capability to actual needs rather than maintaining constant operation
3Use of energy by moving object
If the optical network unit does not send response messages during sleep mode, then power consumption is reduced, but the OLT cannot detect bandwidth allocation status
Solution Approach 1:
The OLT acts as an intermediary that manages the sleep mode state of the ONU. Instead of the ONU needing to send response messages, the OLT maintains awareness of the ONU's state through its own records and control decisions, eliminating the need for continuous ONU responses while preserving bandwidth allocation status information
Data Source
AI summary
An optical line terminal is provided which includes an upward band allocating unit configured to send an upward bandwidth allocation map to an optical network unit and to determine a sleep mode of the optical network unit according to whether a response message corresponding to the upward bandwidth allocation map is received; and an alarm unit configured to determine an upward bandwidth allocation map transfer operation as a normal operation according to an operation of the sleep mode.