FEC Offload in SFP Transceivers for Cellular PHY-MAC Interfaces
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Solution Overview
Problem
Current FEC implementation in cellular networks is compute-intensive and requires additional dedicated hardware, leading to increased latency and bandwidth usage, which hinders flexibility and scalability, especially in fully virtualized RAN approaches.
Innovation Solution
Merging FEC functionality into the PHY-MAC interface and implementing it within a small form factor transceiver, allowing configurations from the PHY controller, identifying and encoding/decoding data payloads, and forwarding them to the next layer, thereby offloading FEC operations to existing hardware without additional acceleration units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dedicated FEC hardware accelerators are added to the CU or DU, then FEC processing performance is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges FEC processing functionality into the existing SFP transceiver module that connects PHY and MAC layers. Instead of adding separate dedicated FEC hardware accelerators to the CU or DU, the invention combines FEC encoding/decoding capabilities with the existing optical transceiver infrastructure, thereby improving FEC processing performance without significantly increasing device complexity
Solution Approach 2:
The SFP transceiver module is designed to perform multiple functions: optical signal transmission/reception and FEC processing. By making the SFP module universal and multi-functional, the patent eliminates the need for separate dedicated FEC hardware accelerators, thus improving productivity while maintaining acceptable device complexity levels
2Adaptability or versatility
If FEC functionality is implemented in software, then flexibility and scalability are improved, but processing speed and performance deteriorate
Solution Approach 1:
The patent combines hardware acceleration capabilities with software-configurable FEC algorithms within the SFP transceiver module. This hybrid approach allows the system to maintain the flexibility and scalability of software implementation while achieving the processing speed of hardware acceleration through the integrated encoder/decoder circuits in the SFP module
Solution Approach 2:
The FEC implementation in the SFP module is designed to be dynamically configurable through software control from the PHY controller. The hardware circuits can be programmed or reconfigured to support different FEC schemes (convolutional codes, turbo codes, LDPC codes) and parameters, thereby achieving both high processing speed and adaptability
3Reliability
If payload data traverses between communication module and PHY, then data transmission is achieved, but bandwidth consumption and latency increase
Solution Approach 1:
The patent performs FEC encoding/decoding operations at the SFP transceiver module before or during the data transmission between PHY and MAC layers, rather than after data has traversed multiple interfaces. This preliminary processing approach ensures reliable data transmission while minimizing the time data spends in transit, thereby reducing latency
Solution Approach 2:
The invention extracts the FEC processing function from the main data path between PHY controller and communication module. By placing FEC encoding/decoding in the SFP module at the interface level, the patent removes the need for payload data to traverse additional interfaces and processing stages, thus reducing bandwidth consumption and latency while maintaining transmission reliability
Data Source
AI summary
The disclosed invention presents new approach for FEC implementation as part of existing link between the PHY layer (L1) and MAC layer. In one embodiment a method for providing cellular network Forward Error Correction (FEC) offload, includes merging FEC functionality into the PHY-MAC interface including placing FEC functionality IPs inside a small form factor (SFP) transceiver and allowing configurations from the PHY controller; identifying data carrying packets; encoding/decoding of the data payload; and forwarding an encoded/decoded payload to the next layer.