Quiet Window Control for Passive Optical Network Delay Reduction
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Solution Overview
Problem
Passive Optical Network (PON) systems experience significant transmission delays due to the need for quiet windows, which are used for ONU discovery and ranging, leading to upstream service delays and packet loss.
Innovation Solution
Implementing a method and apparatus that dynamically control the opening of quiet windows, where a first quiet window is opened only when necessary for ONU discovery and a shorter second quiet window is used for ONU ranging, centered on the estimated arrival time of the ranging response, reducing the overall transmission delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quiet windows are opened for ONU discovery and ranging, then ONU registration and ranging functions are achieved, but transmission delays increase and packet loss occurs
Solution Approach 1:
The patent applies dynamics by making the quiet window configuration adjustable and adaptive rather than fixed. The OLT can dynamically configure different quiet window durations for different ONUs based on their specific ranging requirements and distance from the OLT, allowing the system to optimize between registration functionality and transmission delay for each individual ONU
Solution Approach 2:
The patent implements local quality by applying different quiet window configurations to different ONUs based on their specific characteristics. Each ONU can have a customized quiet window duration tailored to its ranging needs and physical distance from the OLT, rather than using a uniform configuration for all ONUs, thereby reducing unnecessary delays for ONUs that require shorter quiet windows
2Adaptability or versatility
If quiet windows are opened periodically for ONU discovery, then new ONUs can be discovered and registered, but normal ONU data transmission is interrupted
Solution Approach 1:
The patent applies periodic action by implementing scheduled quiet windows at predefined time intervals rather than continuously or randomly. This allows the system to periodically perform ONU discovery and ranging operations while ensuring that normal data transmission occurs during non-quiet window periods, thus balancing discovery capability with transmission efficiency
Solution Approach 2:
The system dynamically adjusts quiet window scheduling based on network conditions and ONU registration needs. The OLT can flexibly determine when to open quiet windows and for how long, allowing normal data transmission to proceed uninterrupted except when discovery or ranging operations are actually needed
Data Source
AI summary
Embodiments of the present application provide a method and apparatus for opening a quiet window, and a registration method, apparatus and system. The method for opening a quiet window includes that: a first quiet window is opened when it is determined that the first quiet window needs to be opened, wherein the first quiet window is used for Optical Network Unit (ONU) discovery. According to the embodiments of the present application, a first quiet window is opened only when it is determined that the first quiet window needs to be opened, rather than periodically opening the first quiet window, such that the efficiency of the first quiet window is improved and the impact of the first quiet window on a data transmission delay is reduced, thereby reducing a transmission delay of a Passive Optical Network (PON) system.