Upstream Burst Overhead Parameter Management in PON Systems
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Solution Overview
Problem
The existing GPON systems face complexity and inefficiency in managing upstream burst overhead parameters, as these parameters are not updated when link quality improves, leading to suboptimal bandwidth utilization due to a lack of flexible negotiation mechanisms.
Innovation Solution
A method where the OLT or ONU detects transmission quality and determines suitable upstream burst overhead parameters, allowing for dynamic switching to improved parameter sets based on link quality, enabling flexible selection and improved bandwidth efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the OLT broadcasts upstream burst overhead parameters to all ONUs during register process, then the parameters are consistently determined between OLT and ONU, but the parameters cannot be updated when link quality improves, leading to suboptimal bandwidth utilization
Solution Approach 1:
The patent implements dynamic parameter adjustment by introducing a parameter update mechanism that allows ONUs to switch between different parameter sets based on link quality conditions. The OLT determines multiple parameter sets corresponding to different link quality levels and notifies ONUs to switch parameters dynamically, transforming the static parameter configuration into a dynamic adaptive system that responds to changing link conditions.
Solution Approach 2:
The patent applies parameter changes by defining multiple upstream burst overhead parameter sets with different configurations (preamble length, delimiter length, guard band) corresponding to different link quality levels. When link quality improves, the system switches to parameter sets with shorter overhead, thereby changing the parameters to optimize bandwidth utilization while maintaining reliability.
2Adaptability or versatility
If separate indication mechanisms are used for FEC state and other upstream burst overhead parameters, then each parameter can be independently controlled, but the system complexity increases
Solution Approach 1:
The patent merges the indication mechanisms for FEC state and other upstream burst overhead parameters into a unified parameter set indication approach. Instead of using separate indication mechanisms, the OLT indicates multiple parameter sets that include both FEC state and other parameters together, and the ONU switches to the indicated parameter set as a whole, thereby reducing system complexity while maintaining independent control capability through parameter set selection.
Solution Approach 2:
The patent creates universal parameter sets that serve multiple functions simultaneously. Each parameter set includes FEC state, delimiter, preamble, and guard band parameters, allowing a single indication mechanism to control multiple parameters at once. This multi-functional approach reduces the number of separate indication mechanisms needed while maintaining the ability to independently adjust each parameter through parameter set selection.
Data Source
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AI summary
A method for managing upstream burst overhead parameters includes: an Optical Line Terminal (OLT) or an Optical Network Unit (ONU) detects transmission quality of a downlink between the OLT and the ONU; the OLT or the ONU determines the upstream burst overhead parameters suitable for the ONU according to the transmission quality; and the ONU starts to use the upstream burst overhead parameters suitable for the ONU after the switching time determined by the ONU itself or indicated by the OLT. The present invention also provides an ONU and an OLT for managing the upstream burst overhead parameters. The present invention can improve the bandwidth utilization rate and decrease the complexity of indicating the upstream burst overhead parameters in PON system, so that the ONU and the OLT are enabled to flexibly and simply select the upstream burst overhead parameters.