An Analysis of Frame Replication and Elimination for Time-Sensitive Networking

Automotive Ethernet is becoming the backbone network of future vehicle because of its large data bandwidth and high communication speed. In order to satisfy the requirements of vehicle communication, the network needs the characteristic of seamless redundancy. IEEE P802.1 CB is one of the TSN (Time-Sensitive Networking) active projects, which provides seamless redundancy character for Automotive Ethernet by frame replication and elimination at flexible position to improve reliability. In this paper, the operating principle of IEEE P802.1 CB was analyzed, including network topology, redundancy tag, sequence generation function, sequence recovery function, timeout mechanism and latent error detection. A network complying IEEE P802.1 CB was simulated in Visual Studio and 7 situations of packet transmission were tested in CppUTest. The results show that when IEEE P802.1 CB is used over a network that are fixed to a specific topology, and that are protected against congestion loss, it can substantially increase seamless redundancy character for the network and is especially suitable for time-critical system.