Physical Layer FEC Bypass Negotiation for Latency-Reliability Tradeoffs
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Solution Overview
Problem
The challenge in using forward error correction (FEC) in physical layer data transmission is determining the appropriate use of FEC bypass to balance reliability and latency in different scenarios, such as long-distance and low-latency data transmission.
Innovation Solution
A method and apparatus that determine the operation mode for FEC bypass based on the capabilities of the transmitting and receiving devices, using auto-negotiation pages to exchange technology ability fields, allowing for proper use of FEC in scenarios like long-distance and low-latency data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If FEC bypass is performed to reduce latency in low-latency data transmission scenarios, then physical layer latency is reduced, but transmission reliability deteriorates
Solution Approach 1:
The patent implements dynamic switching between FEC enabled and FEC bypass modes based on real-time capability negotiation between devices. The system determines the appropriate operation mode (FEC or FEC bypass) by exchanging auto-negotiation pages and evaluating capability fields, allowing the transmission mode to adapt dynamically to different scenario requirements rather than being fixed
Solution Approach 2:
The patent changes the operational parameter of FEC (enabled/bypass) based on negotiated capabilities. By modifying the FEC parameter state according to the determined operation mode, the system achieves different transmission characteristics - using FEC for reliability in long-distance scenarios and bypassing FEC for low latency in short-distance scenarios
2Reliability
If FEC is used to improve transmission reliability in long-distance data transmission scenarios, then signal-to-noise ratio margin is increased, but transmission latency increases
Solution Approach 1:
The system dynamically selects between FEC enabled mode and FEC bypass mode based on the determined operation mode from capability negotiation. This dynamic selection allows the system to optimize for reliability when needed (long-distance) while avoiding unnecessary FEC processing when latency is more critical (short-distance)
Solution Approach 2:
The FEC operational parameter is changed based on the determined operation mode. When the operation mode indicates FEC bypass, the FEC parameter is disabled to reduce latency; when the operation mode indicates FEC should be used, the parameter is enabled to improve reliability
3Adaptability or versatility
If auto-negotiation pages are exchanged to determine operation mode based on device capabilities, then adaptability to different scenarios is improved, but device complexity increases
Solution Approach 1:
The patent uses universal auto-negotiation pages with standardized capability fields that can represent multiple different scenarios and device capabilities. These pages serve multiple functions: identifying device types, determining supported modes, and establishing the operation mode, thereby achieving high adaptability through a single universal negotiation mechanism
Solution Approach 2:
The capability negotiation and operation mode determination are performed in advance before actual data transmission begins. By completing the negotiation and determining the appropriate mode beforehand, the system avoids the need for complex real-time decisions during data transmission, simplifying the overall process
Data Source
AI summary
This application discloses a physical layer data transmission method, apparatus, system, and device, and a chip. In the method, after obtaining first data, a first device processes the first data based on a current operation mode, to obtain second data. The current operation mode indicates whether to perform FEC bypass, and the current operation mode is determined based on capabilities of the first device and a second device. Then, the first device sends the second data to the second device. According to the method provided in this application, a requirement of using FEC in a long-distance data transmission scenario can be supported, and a requirement of not using FEC in a low-latency data transmission scenario can also be supported, ensuring reliability of data transmission in different scenarios.