PON Upstream Delimiter Synchronization and Error Reduction
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Solution Overview
Problem
The existing GPON system's delimiter field, with a length of 16 or 20 bits, struggles to meet the new requirements for improved upstream and downstream transmission rates and bit error rate in next-generation systems, leading to difficulties in satisfying error probability and synchronization needs.
Innovation Solution
A method and device for sending an upstream transfer frame in a PON system that uses a preamble, a burst synchronization delimiter with balanced zeros and ones, and a GTC frame header and data, where the delimiter sequence ensures equal numbers of zeros and non-zeros on odd and even bits, and continuous groups have minimal differences, improving synchronization and reducing error probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the delimiter field length is kept at 16 or 20 bits as in prior art, then the system complexity is low and ease of manufacture is maintained, but the bit error rate requirement and synchronization performance cannot be satisfied in next-generation systems
Solution Approach 1:
The patent changes the parameters of the delimiter field by extending its length from 16 or 20 bits to 32 bits, and modifies the bit composition rules to include specific patterns (0x55, 0xAA, 0x33, 0xCC) that provide better synchronization properties and error detection capabilities for next-generation GPON systems
Solution Approach 2:
The delimiter field is segmented into specific byte patterns (0x55, 0xAA, 0x33, 0xCC) that can be independently recognized and processed, allowing the receiving end to perform more robust synchronization and error detection through pattern matching
2Productivity
If the upstream and downstream transmission rates are improved in next-generation systems, then the productivity and service capability are enhanced, but the error probability increases and existing delimiter fields cannot satisfy the requirements
Solution Approach 1:
The patent incorporates error detection and synchronization patterns in advance within the delimiter field structure, using specific bit patterns that can detect and correct errors before they propagate, thereby cushioning against the increased error probability that comes with higher transmission rates
3Reliability
If a longer and more complex delimiter field is used to reduce error probability, then the reliability is improved, but the device complexity and processing overhead increase
Solution Approach 1:
The patent optimizes the delimiter field parameters by using specific repetitive patterns (0x55, 0xAA, 0x33, 0xCC) that enhance synchronization accuracy through their distinctive bit structures, while the regularity of these patterns actually simplifies the processing logic at the receiving end compared to arbitrary long sequences
Data Source
AI summary
The present invention relates to the Passive Optical Network (PON) technology, and a method for sending an upstream transfer frame in a PON is provided. The method includes: after success of link, sending a preamble according to an allocated time slot, sending a burst synchronization delimiter, and then sending successively a burst header, a Gigabit-Capable Passive Optical Network (GPON) Transmission Convergence (GTC) frame header, and GTC frame data. In the sent synchronization delimiter, the number of zeros on the odd bits is N, the number of non-zeros on the odd bits is M, a relation |N−M|≦1 is satisfied, the max number of zeros in a continuous zero group is X, the max number of non-zeros in a continuous nonzero group is Y, and a relation |X−Y|≦1 is satisfied. A device for sending an upstream transfer frame in a passive optical network is further provided.