# ETSI EN 302 637-2 — ITS V2X Standard (Metadata)

## Bibliographic Metadata

| Field | Value |
|-------|-------|
| Standard Number | ETSI EN 302 637-2 V1.4.1 |
| Title | Intelligent Transport Systems (ITS); Vehicular Communications; Basic Set of Applications; Part 2: Specification of Cooperative Awareness Basic Service |
| Publisher | ETSI (European Telecommunications Standards Institute) |
| Year | 2019 |
| Category | ITS-G5 / V2X (Vehicle-to-Everything) |
| Direct PDF | https://www.etsi.org/deliver/etsi_en/302600_302699/30263702/01.04.01_60/en_30263702v010401p.pdf |
| ETSI Portal | https://www.etsi.org/deliver/etsi_en/302600_302699/30263702/01.04.01_60/ |

## Standard Overview

ETSI EN 302 637-2 defines the **Cooperative Awareness Basic Service (CAM)** — the core
broadcast service in ITS-G5 (European V2X standard based on IEEE 802.11p / ETSI ITS).

### Key Components
- **CAM (Cooperative Awareness Message)**: Periodic broadcast (1–10 Hz) containing vehicle
  position, speed, heading, acceleration, and status (lights, brake status, etc.)
- **CA Basic Service**: The service layer managing CAM generation, transmission, and reception
- **Triggering conditions**: Time-based and event-triggered (change in heading > 4°, speed change > 0.5 m/s, position change > 4 m)
- **Frequency**: 5.9 GHz ITS-G5 band (ETSI EN 302 663)

### Message Structure (CAM)
```
CAM ::= SEQUENCE {
  header     ItsPduHeader,
  cam        CoopAwareness
}
CoopAwareness ::= SEQUENCE {
  generationDeltaTime  GenerationDeltaTime,
  camParameters        CamParameters
}
CamParameters ::= SEQUENCE {
  basicContainer          BasicContainer,
  highFrequencyContainer  HighFrequencyContainer,
  lowFrequencyContainer   LowFrequencyContainer OPTIONAL,
  specialVehicleContainer SpecialVehicleContainer OPTIONAL
}
```

### Relation to ITS-G5 Stack
| Layer | Standard |
|-------|---------|
| Application | ETSI EN 302 637-2 (CAM), EN 302 637-3 (DENM) |
| Facilities | ETSI EN 302 665 |
| Networking & Transport | ETSI EN 302 636-4-1 (GeoNetworking) |
| Access | ETSI EN 302 663 (ITS-G5 / IEEE 802.11p) |
| Physical | IEEE 802.11p (5.9 GHz DSRC) |

## Relevance to Research
ETSI ITS-G5 / CAM is the baseline broadcast protocol for V2V and V2I cooperative
awareness in European ITS deployments. It directly underpins multi-agent vehicular
coordination scenarios where agents (vehicles, RSUs) need real-time situational awareness
without centralized orchestration — a direct comparison point for A2A-based agent
discovery and task delegation in vehicular edge computing contexts.

## Download Instructions
The standard PDF is freely available from ETSI:
- Direct PDF: https://www.etsi.org/deliver/etsi_en/302600_302699/30263702/01.04.01_60/en_30263702v010401p.pdf

*Status: METADATA ONLY — PDF download blocked in sandbox environment (HTTPS proxy restriction)*
*Retrieved: 2026-06-07*
