Standardized messages in C-ITS - The CAN and DENM standards

Abstract

This memo summarizes the Cooperative Awareness Message (CAM) and Decentralized Environmental Notification Message (DENM) message format for C-ITS. CAM and DENM are standardized by ETSI in ETSI EN 302 637-2 (v.1.3.2 used here) and ETSI EN 302 637-3 (v.1.2.1 used here) respectively. The memo also describes some of the intended use cases for these message types. The memo focuses on the content of the messages, and does not describe or take into account the network of the data communication other than in an overall view where this is required to explain critical aspects. Parties interested in the network and data communication is referenced to standards such as ETSI EN 302 636-4-1 and ETSI EN 302 636-4-2 (Geo-Networking), ETSI EN 302 636-5-1 (BTP) and ETSI EN 302 636-6-1 (IPv6 over GN) for a starting point. An overview off all the standards that entails the CEN/ISO Release 1 for cooperative ITS can be seen at http://release1.its-standards.eu.