PON OLT ONU Low Power Mode Link State Control
Solution Overview
Problem
Existing PON systems face challenges in reducing power consumption while maintaining a link between the OLT and ONU, as previous methods either require specific communication conditions or do not account for the absence of user data, leading to inefficient power management.
Innovation Solution
Incorporating a control unit in the OLT that generates and transmits control signals to the ONU to manage the transition to a low power consumption mode, ensuring the link state is maintained and upstream bandwidth is allocated accordingly, even when user data is not present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ONU maintains a link with the OLT during standby, then communication readiness is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by enabling the ONU to dynamically transition between normal operation mode and low power consumption mode based on communication needs. The ONU can switch its operational state in response to control signals from the OLT, allowing the system to adapt power consumption levels while maintaining link readiness when required.
Solution Approach 2:
The patent utilizes parameter changes by modifying the operational parameters of the ONU. By changing the power consumption parameter between different operational modes (normal mode with full functionality versus low power mode with reduced functionality), the system achieves energy savings while preserving the ability to maintain link state through controlled parameter transitions.
2Use of energy by moving object
If the ONU transitions to low power consumption mode, then power consumption is reduced, but link state maintenance becomes difficult
Solution Approach 1:
The patent implements feedback mechanisms where the OLT monitors the ONU's operational state and sends control signals to manage transitions between normal and low power modes. This feedback loop ensures that the link state is maintained even when the ONU is in low power consumption mode, as the OLT can detect and respond to the ONU's state changes and coordinate bandwidth allocation accordingly.
Solution Approach 2:
The OLT serves as an intermediary that manages the transition and coordination between the ONU's different operational modes. The OLT controls the timing and conditions of mode transitions, allocating upstream bandwidth appropriately when the ONU switches to low power mode, thereby maintaining link reliability without requiring the ONU to continuously operate at full power.
3Use of energy by moving object
If the ONU stops functions when no data is exchanged, then power consumption is reduced, but communication readiness deteriorates
Solution Approach 1:
The patent applies periodic action by implementing scheduled transitions between operational modes. The ONU periodically switches to low power consumption mode when no data communication is occurring, and returns to normal mode when communication is needed. This periodic cycling between states allows the system to reduce power consumption during idle periods while ensuring communication readiness is restored when required, balancing energy savings with productivity.
Data Source
AI summary
An optical line terminal (OLT) that configures a passive optical network (PON) system in cooperation with an optical network unit (ONU). The OLT has a controller to control a link state with the ONU. The controller generates, in one case, a control signal specifying a first low power consumption mode in which the ONU operates in the low power consumption mode in an upstream direction, and generates, in another case, the control signal specifying a second low power consumption mode in which the ONU operates in the low power consumption mode in both upstream and downstream directions. Further, the generated control signal is transmitted to the ONU.