May 2006 ITS-Philadelphia

1. VII Network and Roadside Equipment Review Craig Pickering May 2006 ITS-Philadelphia

2. Schedule

3. The VII Architecture provides a scalable infrastructure to support a national footprint, a robust set of applications and over 150 million vehicles

4. VII System Architecture

5. The VII Network Access Point (NAP) consists of multiple gateways to enable system traffic to pass through the VII Network • Provides • Data transport • Traffic routing • Access control functions • Primary Network Interface Point • Roadside Equipment • VII Service Delivery Node • VII end users (public and private) • Other VII NAPs

6. The Service Delivery Node provides the core enabling services needed to support VII applications • The Event Notification Service (ENS) enables and manages the probe data distribution • The Message Delivery Agents (MDA) enable and manage delivery of advisory messages • The IP Session Dispatcher supports session management between vehicles and network end users

7. The Service Delivery Node provides the core enabling services needed to support VII applications • Map Element Generator • Maintains reference map • Harvests location-based probe data elements • Applies positional corrections • Generates updated map elements • Manages the delivery and version state of map elements • Position Correction Generator • Generates and tracks position correction information • Delivers corrections to RSEs • Distributes corrections to the Map Element Generator

8. The Service Delivery Node provides the core enabling services needed to support VII applications • RSE Information Lookup Agent • Accepts requests for RSE information • Requestor access controlled • Provides search capability (e.g., geographic boundary) • Network Management • Monitors and manages all SNMP-based network devices and components at the local NAP and SDN • Maintains network management connectivity to all assigned RSEs • Facilitates on-site management and troubleshooting • Facilitates remote management from the ENOC

9. Distributed nationwide Interfaces to other VII Subsystems: Network Access Point On-Board Equipment Interfaces to External Systems Local Safety System GPS Satellite Routing between Interfaces as appropriate Run-time environment for Management and Proxy Services Roadside Equipment (RSE) Subsystem

10. RSE Platform – General Requirements • Physical and Environmental • GPS Function - Time and Position Estimates • DSRC • Provide Communications with OBEs • Performance (Class C device, 33 dBm maximum EIRP) • Network Gateway • Connects RSE to VII Network Access Point (NAP) • Configurable to support wired or wireless (backhaul) links • Local Safety System Interface • RSE Management Services • Initialization and Registration • Network Management • Security Management

11. RSE Proxy Services • Positioning Service • Obtain DGPS Corrections • Monitor Position Integrity • Store and disseminate current DGPS corrections • Message Broker • Vehicle Probe Data Services • Probe Data Collection Proxy • Probe Generation Manager • Local Safety System Proxy Services • Other Proxy Services