ONU Power Management Direct State Transition
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Solution Overview
Problem
Conventional optical network units (ONUs) in passive optical networks (PONs) lack the ability to directly transition between low power states without going through a high power state, leading to increased power consumption and reduced battery life during outages.
Innovation Solution
Implementing a unified power management method that allows ONUs to transition between a dozing state and a sleep state directly, without going through an active state, by controlling the ONU's transmitter and receiver states using specific timing parameters and signaling between the ONU and the optical line terminal (OLT).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the ONU transitions between low power states through a high power state, then the ONU can maintain simpler state management, but power consumption increases and battery life decreases
Solution Approach 1:
The patent segments the power management into two distinct low-power states: dozing state (transmitter off, receiver on) and sleep state (both transmitter and receiver off). By dividing the power management into separate states with specific transition rules, the system achieves direct transitions between low-power states without requiring passage through a high-power state, thereby reducing overall power consumption while maintaining manageable complexity through structured state definitions
Solution Approach 2:
The patent implements dynamic state transitions controlled by timing parameters and signaling mechanisms. The ONU can dynamically switch between dozing and sleep states based on traffic conditions and timing parameters (Tlisten, Tsleep, Tlowpower), enabling adaptive power management that optimizes energy consumption while maintaining responsiveness to communication requests through configurable transition criteria
2Duration of action of moving object
If the ONU uses battery backup to extend operational time during outages, then communication services can be maintained, but the battery size and cost increase
Solution Approach 1:
The patent changes the operational parameters of the ONU by introducing configurable timing parameters (Tlisten, Tsleep, Tlowpower) that control the duration and conditions of low-power states. By adjusting these parameters, the system can extend operational time during battery-powered outages without requiring larger battery capacity, as the optimized power consumption allows longer duration from the same energy source
Solution Approach 2:
The patent implements periodic transitions between dozing and sleep states based on timing parameters and traffic patterns. During battery backup operation, the ONU can periodically switch between states to balance power consumption with communication requirements, extending the effective operational time of the battery by utilizing low-power intervals strategically
3Productivity
If the ONU remains in active state to maintain responsiveness, then communication requests can be handled immediately, but power consumption increases
Solution Approach 1:
The patent creates a dynamic power management system where the ONU transitions between dozing and sleep states based on real-time traffic conditions and timing parameters. The system maintains productivity by ensuring the ONU can quickly transition to active state when needed, while spending most time in low-power states to reduce consumption. The configurable parameters allow optimization of the balance between responsiveness and energy savings
Solution Approach 2:
The patent prepares the ONU for quick response by maintaining the receiver in the dozing state (ready to receive) while the transmitter is off. This preliminary preparation allows the system to be in a low-power state while still being able to quickly respond to incoming communication requests, as the receiver is already active and can immediately process incoming signals without requiring full activation of all components
Data Source
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AI summary
Techniques for unified optical network unit power management in a passive optical network include operating an optical network unit (ONU) in a first state in which a transmitter of the ONU is turned off and a receiver of the ONU is turned on, operating the ONU in a second state in which both the transmitter and the receiver are turned off, and transitioning the ONU directly between the first state and the second state, based on a power management rule.