Dynamic Bandwidth Allocation for PON Power Saving
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Solution Overview
Problem
In passive optical networks, ONUs in power saving mode do not respond to upstream bandwidth allocation, leading to transmission errors and inefficient use of bandwidth due to continuous allocation of resources without distinguishing between normal and power-saving modes.
Innovation Solution
An apparatus with a power saving mode managing unit, bandwidth allocation parameter storage, and dynamic bandwidth allocating unit that provides tailored bandwidth allocation information to ONUs based on their power-saving mode status, ensuring efficient use of upstream bandwidth and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bandwidth allocation is continuously maintained for ONUs in power saving mode, then upstream transmission errors are reduced, but bandwidth utilization efficiency deteriorates
Solution Approach 1:
The patent implements dynamic bandwidth allocation that adapts to the operational state of ONUs. The OLT distinguishes between normal mode and power saving mode, adjusting bandwidth allocation parameters accordingly. When an ONU is in power saving mode, the system allocates reduced or zero upstream bandwidth during sleep intervals, and only allocates bandwidth during active intervals when the ONU is awake and ready to transmit. This dynamic adjustment resolves the contradiction by maintaining reliable communication during active periods while eliminating wasted bandwidth allocation during sleep periods.
2Ease of operation
If optical signal reception interface remains active for bandwidth allocation, then bandwidth allocation responsiveness is improved, but power consumption increases
Solution Approach 1:
The patent segments the operational cycle of the ONU into distinct active intervals and sleep intervals. During sleep intervals, the optical signal reception interface (Rx) is deactivated to save power, while during active intervals, the Rx interface is activated to receive bandwidth allocation information and perform upstream transmission. This temporal segmentation allows the system to achieve power savings by turning off the Rx interface during periods when no communication is needed, while maintaining full responsiveness during active intervals when communication occurs.
Data Source
AI summary
An apparatus and method for managing a dynamic bandwidth allocation to support a low-power mode, in a passive optical network (PON) are provided. The apparatus may include a power saving mode managing unit to manage a power saving mode of at least one optical network unit (ONU), a bandwidth allocation parameter storage unit to store a bandwidth allocation parameter used for a power saving mode, and to maintain the stored bandwidth allocation parameter, and a dynamic bandwidth allocating unit to provide bandwidth allocation information to the at least one ONU, when the stored bandwidth allocation parameter is received.