Dynamic FEC Interleaving Level Adjustment for Automotive Ethernet
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Solution Overview
Problem
Automotive Ethernet networks face interference issues such as low-frequency short impulse interference and RF interference, which degrade communication quality, and existing physical layer techniques lack flexibility to adapt to changing conditions or application requirements.
Innovation Solution
A method and device for dynamically adjusting the interleaving level in forward error correction (FEC) frames based on information from Operations, Administration, and Management (OAM) words, which include bit error rate (BER) and latency data, allowing real-time adaptation of interleaving levels to optimize communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If forward error correction (FEC) with Reed-Solomon encoding and FEC frame interleaving are used to provide reliable point-to-point communications, then communication reliability is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent implements dynamic adjustment of the interleaving level L based on received signal quality indicators (such as BER - bit error rate). The interleaving level is no longer fixed but adapts in real-time to channel conditions. When signal quality degrades, the interleaving level increases to provide better error protection; when signal quality is good, the interleaving level decreases to reduce processing complexity. This dynamic adaptation resolves the contradiction by making the system flexible rather than static.
Solution Approach 2:
The patent changes the parameter of interleaving level L from a fixed value to a dynamically adjustable parameter. By modifying this key parameter based on channel conditions (using feedback from OAM words containing BER information), the system optimizes the balance between reliability and complexity. The interleaving level L can be adjusted in discrete steps, allowing fine-tuned control over the trade-off between error correction capability and processing overhead.
2Reliability
If higher interleaving levels are used to protect against burst errors and interference, then error correction capability is improved, but latency increases
Solution Approach 1:
The patent dynamically adjusts the interleaving level L based on actual channel conditions rather than using a consistently high interleaving level. When the channel is good, the interleaving level is reduced, thereby reducing latency. When the channel deteriorates (higher BER detected), the interleaving level is increased to maintain error correction capability. This time-varying adaptation resolves the contradiction by applying high interleaving only when necessary.
Solution Approach 2:
The system periodically reassesses channel conditions by receiving OAM words containing BER information at regular intervals and adjusts the interleving level accordingly. This periodic feedback mechanism allows the system to switch between different interleaving levels based on current conditions, rather than maintaining a fixed high interleaving level that would always incur high latency.
3Device complexity
If fixed interleaving levels are used in FEC frames, then device complexity is reduced, but adaptability to changing interference conditions and application requirements deteriorates
Solution Approach 1:
The patent transforms the static interleving level into a dynamic parameter that can be adjusted in response to changing conditions. The system receives feedback information (OAM words containing BER) and modifies the interleving level L accordingly. This enables adaptation to varying interference conditions and different application requirements (e.g., real-time audio vs. non-real-time data) without requiring complex manual reconfiguration, resolving the contradiction between simplicity and adaptability.
Solution Approach 2:
The patent implements a feedback mechanism where the receiver measures channel quality (BER) and sends this information back to the transmitter via OAM words. The transmitter uses this feedback to adjust the interleving level L. This closed-loop control system enables automatic adaptation to changing conditions while keeping the control logic relatively simple, thus resolving the contradiction between device complexity and adaptability.
Data Source
AI summary
Embodiments of a method and a device are disclosed. In an embodiment, a method for performing physical layer operations in a point-to-point network is disclosed. The method involves receiving, from a link in the communications network, information in an operations, administration, and management (OAM) word, setting an interleaving level, L, in response to the information received in the OAM word, inserting an OAM word into a forward error correction (FEC) frame, the OAM word including the set interleaving level (L), and transmitting, onto the link in the communications network, the FEC frame, which includes the OAM word.