Optical Line Terminal Bandwidth Allocation for PON Queue Errors
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Solution Overview
Problem
In passive optical network (PON) systems, queue report errors from specific ONUs lead to unnecessary occupation of upstream bandwidth, disrupting normal upstream data transmission by allocating bandwidth based on incorrect queue reports.
Innovation Solution
An optical line terminal (OLT) with a frame monitoring unit, error detection unit, and band allocation controller that identifies and separates abnormal queue reports, adjusting upstream bandwidth allocation for affected ONUs by distinguishing between idle and user packets, and reducing bandwidth for ONUs with repeated errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the OLT allocates upstream bandwidth based on queue reports from ONUs, then the upstream transmission efficiency is improved, but queue report errors from specific ONUs cause unnecessary bandwidth occupation and disrupt normal upstream transmission
Solution Approach 1:
The OLT monitors the actual upstream frame data received from ONUs and compares it with the queue reports submitted by ONUs. This feedback mechanism allows the OLT to detect discrepancies between reported queue status and actual transmission behavior, identifying queue report errors and adjusting bandwidth allocation accordingly to maintain both efficiency and accuracy
Solution Approach 2:
The bandwidth allocation is made dynamic by allowing the OLT to adjust allocation in real-time based on detected queue report errors. When errors are detected, the OLT can modify the upstream bandwidth allocation for specific ONUs dynamically, transitioning from static report-based allocation to adaptive allocation that responds to actual network conditions and error patterns
2Measurement precision
If the OLT monitors and detects queue report errors by analyzing upstream frame data, then bandwidth allocation accuracy is improved, but the system complexity increases due to additional monitoring and detection mechanisms
Solution Approach 1:
The OLT's existing upstream frame reception and processing functions are extended to serve dual purposes: normal data processing and queue report error detection. By making the monitoring system multi-functional, the patent avoids adding completely separate dedicated detection hardware, thereby improving measurement precision while limiting the increase in overall system complexity
3Measurement precision
If the OLT separately allocates upstream bandwidth for ONUs with queue report errors, then bandwidth allocation accuracy is improved, but the device complexity increases due to separate allocation mechanisms
Solution Approach 1:
The bandwidth allocation process is segmented into two distinct paths: one for normal ONUs using standard queue report-based allocation, and another for ONUs with detected errors using corrected allocation based on actual monitored data. This segmentation allows precise allocation for error-prone ONUs while maintaining simple standard allocation for normal ONUs, balancing precision and complexity
Data Source
AI summary
Disclosed are an apparatus and a method capable of adjusting an upstream band for a corresponding ONU by detecting a quantity of bands occupied by a packet, not an effective user packet, among upstream transmission bands for each target object of allocation of each band in the OLT to examine whether a queue report is normal, and detecting an ONU, which transmits an abnormal queue report, according to the examination. An OLT of a PON according to an exemplary embodiment of the present disclosure includes: a frame monitoring unit configured to monitor upstream frame data received for each T-CONT; an error detection unit configured to determine whether a queue report error is generated for each T-CONT according to a result of the monitoring; and a band allocation controller configured to allocate an upstream band for an ONU, in which the queue report error is generated, separately from a normal ONU.