PON Burst Receiver Resetting via Terminator Sequence
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Solution Overview
Problem
In Passive Optical Network (PON) systems, particularly in GPON, the complexity of upstream burst data transmission is increased due to the need for precise synchronization and resetting of receivers, which is complicated by the requirement to unpack downstream data for bandwidth allocation information and calculate burst start and end times.
Innovation Solution
A burst receiver resetting method that includes receiving a preamble sequence, synchronizing data, matching a Burst Terminator (BT) sequence of 96 bits with all 0s at the end of each burst to delimit the burst, and resetting the receiver after successful matching, thereby simplifying the process and reducing the complexity of implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the receiver performs bit synchronization and unpacks downstream data to obtain bandwidth allocation information for each burst, then the synchronization precision is improved, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining a fixed-length Burst Terminator sequence (96 bits of all zeros) at the end of each upstream burst. This allows the receiver to delimit bursts based on a predetermined pattern without needing to unpack downstream bandwidth allocation information, thereby reducing receiver complexity while maintaining synchronization precision.
Solution Approach 2:
The patent extracts the burst delimitation function from the complex downstream data unpacking process. By using a dedicated Burst Terminator sequence that is independent of bandwidth allocation information, the receiver only needs to detect this specific pattern to delimit bursts, separating the delimitation function from the bandwidth management complexity.
2Reliability
If the receiver resets before each burst processing, then the reliability of burst reception is improved, but the loss of time increases due to repeated resetting
Solution Approach 1:
The patent applies feedback by using the detected Burst Terminator sequence to trigger the receiver reset operation. Instead of resetting before each burst based on timing information, the receiver continues processing until it detects the BT sequence, then resets immediately after detection. This feedback mechanism ensures reliability while minimizing unnecessary reset time.
3Reliability
If a protection time slot is maintained between bursts to avoid collision, then the reliability of TDMA transmission is improved, but the loss of time increases due to guard time
Solution Approach 1:
The patent replaces the mechanical timing-based protection mechanism with a signal-based delimitation mechanism. Instead of relying on fixed guard times and precise timing synchronization, the system uses the Burst Terminator sequence as a clear signal marker to delimit bursts. This substitution allows for more flexible burst spacing while maintaining transmission reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively delimits the end of each burst, eliminating the need to unpack upstream bandwidth allocation information from downstream data and calculate burst times, thereby simplifying the implementation and reducing complexity in the Reach Extender (RE) process.
Implementation Method 1
A photodetector and transimpedance amplifier convert light pulses to analog electrical signals
Data Source
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AI summary
A burst transmission method and a receiver resetting method and apparatus in a Passive Optical Network (PON) are provided. A burst receiver resetting method in a PON includes: receiving a preamble sequence and synchronizing data; after synchronizing the data, continuing to receive the data, and matching a Burst Terminator (BT); and resetting a receiver after successfully matching the BT. Meanwhile, an apparatus for implementing the method and a corresponding burst data transmission method are provided. By using the burst receiver resetting method and apparatus in the PON and the corresponding burst transmission method at an Optical Network Unit (ONU) burst transmission end, a Reach Extender (RE) does not need to unpack upstream burst bandwidth allocation information carried in downstream data. Therefore, the complexity of the implementation of the RE is reduced, and the method is simple and effective.