Technical analysis of next-generation in-vehicle networks: comparing signal-based buses with service-oriented SOME/IP, real-time DDS, and deterministic Ethernet TSN backbones.
Traditional CAN and LIN buses broadcast raw signals (e.g. wheel speed, steer angle) at static frequencies with tightly packed bit offsets defined by DBC files. In contrast, modern SDVs run Service-Oriented Architecture (SOA) where applications query services, subscribe to state changes, and invoke remote methods over high-bandwidth Automotive Ethernet.
SOME/IP is the foundational protocol standardized by AUTOSAR Adaptive, purpose-built for lightweight client-server RPCs and signal-to-service serialization. DDS excels in data-centric distribution for ADAS and camera/LiDAR fusion, offering brokerless peer-to-peer data transport with over 20 configurable Quality of Service parameters.