FEC Codeword Synchronization Using Resource Block Location Signaling
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Solution Overview
Problem
Existing forward error correction (FEC) codeword synchronization methods face challenges in flexibility and resource utilization, particularly when the length of FEC codewords varies, leading to increased system overheads due to unnecessary synchronization headers, especially when codeword lengths are short or synchronization is not required.
Innovation Solution
A method where a central office device sends synchronization information over a management channel to a terminal device, indicating the agreed location of the FEC codeword within a time-frequency resource block, allowing the terminal device to reset its decoder or encoder status parameters to align with the agreed location, thereby reducing system overheads by ensuring accurate synchronization without unnecessary headers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a synchronization header or start identifier is added to each FEC codeword, then FEC codeword synchronization can be ensured, but system overheads increase especially when codeword lengths are short
Solution Approach 1:
The patent extracts the synchronization function from the data stream by using resource block location information instead of embedding synchronization headers within each FEC codeword. The central office device indicates the location of the first FEC codeword through resource block assignment information, and the terminal device uses this information to align its decoding starting position, thereby achieving synchronization without adding overhead bytes to the data stream.
Solution Approach 2:
The patent makes the resource block location information serve multiple functions: it simultaneously indicates resource allocation and provides synchronization reference for FEC codeword decoding. The same resource block assignment information that tells the terminal where data is located also tells it where the FEC codeword starts, eliminating the need for separate synchronization headers.
2Adaptability or versatility
If FEC codeword and frame structure are in absolute mapping relationship, then resource block flexibility can be met, but resource block utilization decreases due to fixed codeword lengths
Solution Approach 1:
The patent introduces dynamic FEC codeword length adaptation by allowing the first FEC codeword to have a different length from subsequent FEC codewords. The central office device determines the length of the first FEC codeword based on resource block configuration and indicates this length to the terminal device, enabling the system to dynamically adjust codeword lengths to match varying resource block allocations and improve utilization efficiency.
Solution Approach 2:
The patent changes the parameter of FEC codeword length from fixed to variable. By introducing different length configurations for the first FEC codeword compared to subsequent codewords, and by allowing the central office to dynamically set the first codeword's length based on resource block assignment, the system achieves better parameter adaptation to different resource allocation scenarios.
Data Source
AI summary
Embodiments of the present invention provide a forward error correction codeword synchronization method, device, and system. The method is: sending, by a central office device, synchronization information of an FEC codeword to a terminal device by using a management channel, where the information includes information about an agreed location of an FEC codeword, and the information about the agreed location of the first FEC codeword indicates a location that is of the first FEC codeword and is corresponding to data at an agreed location of an agreed time-frequency resource block; and receiving, by the terminal device, the synchronization information that is of the FEC codeword and is sent by the central office device, and adjusting a status parameter of an encoder or a decoder according to the information, so as to complete codeword synchronization. The embodiments of the present invention are used for FEC codeword synchronization.