CPM
TS 103 324The Collective Perception Message lets a vehicle or roadside unit share what its sensors detect, so a receiver learns about objects it has no line of sight to itself.
C-ITS Release 2.
The stack that ships today.
Most V2X documentation still describes Release 1, the EN 302 6xx family from the early 2010s. The standards a deployment implements today are Release 2, a renumbered set of TS 103 8xx and TS 103 9xx deliverables. This page maps one onto the other, layer by layer.
What changed
The same stack,
renumbered.
Layer Release 1 Release 2
Architecture EN 302 665 · v1.1.1 TS 103 898 · v2.0.0
Access (ITS-G5) EN 302 663 · v1.3.1 EN 303 797 · v2.1.1
Access (C-V2X) EN 303 613 · v1.1.1 EN 303 798 · v2.1.1
GeoNetworking EN 302 636-4-1 · v1.4.1 TS 103 836-4-1 · v2.2.1
Transport (BTP) EN 302 636-5-1 · v2.1.1 TS 103 836-5-1
CAM EN 302 637-2 · v1.4.1 TS 103 900 · v2.3.1
DENM EN 302 637-3 · v1.3.1 TS 103 831 · v2.3.1
Message security TS 103 097 · v1.4.1 TS 103 097 · v2.2.1
Basic Set of Applications TR 102 638 · v1.1.1 TS 103 938 · v2.0.0
Where a Release 2 document is a recent early draft, its reference and version are already the current ones, even if the full normative text is still being published; the Release 1 deliverable stays the implementable reference until then.
New in Release 2
Services Release 1
never had.
VAM
TS 103 300-3The VRU Awareness Message gives pedestrians and cyclists a voice on the same channel, announcing their position and motion the way a vehicle broadcasts a CAM.
Misbehaviour reporting
TS 103 759A standard channel for stations to report senders whose messages look wrong, feeding the trust authority that can revoke a compromised certificate.
FAQ
Questions,
answered.
- What replaced EN 302 637-2 in Release 2?
- EN 302 637-2 is the Release 1 CAM. The current Release 2 cooperative awareness service is TS 103 900, at v2.3.1. The Release 1 document remains published but is superseded for new deployments.
- Is a Release 1 message compatible with Release 2 on the air?
- For the core services the message on the wire stays compatible; what changes is the ETSI document and version a deployment cites. CAM, DENM and GeoNetworking all moved to new TS 103 8xx and TS 103 9xx numbers in Release 2.
- What is genuinely new in C-ITS Release 2?
- Two services with no Release 1 equivalent: CPM, the Collective Perception Message (TS 103 324), and VAM, the VRU Awareness Message (TS 103 300-3), plus a standard misbehaviour reporting service (TS 103 759).
- Which ETSI document is the current CAM standard?
- TS 103 900. GeoNetworking is TS 103 836-4-1, DENM is TS 103 831, and the ITS-G5 access layer is EN 303 797. The EN 302 6xx family is Release 1.
Built on the current standards.
See the full V2X software stack that carries these Release 2 messages.