Indianapolis ITS Architecture
| Level | Doc # | Standard | Description |
|---|---|---|---|
| Access | Bundle: Local Unicast Wireless SubNet (US) | A set of alternative standards that can be used to wirelessly unicast information device-to-device in a range of a few hundred meters without requiring the aid of a 3rd entity base station. This includes technologies such as WAVE, C-V2X, and the device-to-device mode of 3GPP 4G and 5G. NOTE: WAVE and C-V2X are both intended for the same 5.9 GHz spectrum, which is currently assigned to WAVE within the US; however, as of late 2019, the FCC is considering a proposal to reassign portions of this spectrum. | |
| Security | Bundle: IEEE 1609.2 | A bundle of standards that groups a set of IEEE security standards together for easy reference. | |
| TransNet | IEEE 1609.3 | IEEE 1609.3 WAVE - Networking Services | This standard defines the network and transport layer options for the WAVE environment. The standard defines three options: a bandwidth efficient single-hop solution known as WSMP, UDP/IP, and TCP/IP. It has been harmonized with ISO FNTP and FSAP - a common message format specified in ISO 16460. |
| Level | Doc # | Standard | Description |
|---|---|---|---|
| Facilities | SAE J2735 | SAE J2735 DSRC Message Set | This standard defines the data and messages for use in DSRC (i.e., V2V, V2I, and V2D) applications. The SAE J2945 series defines additional requirements on how to use these messages. |
| Facilities | SAE J2945 | SAE J2945/0 DSRC Common Design Elements | This standard defines cross-cutting material which applies to the J2945/x series including generic DSRC interface requirements and guidance on Systems Engineering (SE) content. |
| ITS Application Entity | CTI 4501 | CTI 4501 CI Implementation Guide | This Connected Intersection (CI) Implementation Guide defines the key capabilities and interfaces a connected signalized intersection must support to ensure interoperability with production vehicles for state and local IOOs. A connected intersection is defined as an infrastructure system that broadcasts SPaT, MAP, and position correction data to vehicles. |
| ITS Application Entity | CEN ISO 19091 | ISO 19091 V2I for signalized intersections | This technical specification defines messages and related data structures and data elements for the following exchanges between roadside equipment and vehicles: 1) Definition of the SPaT (signal phase and timing) message transmitted from a traffic controller that describes the state of the signals, signal timing as necessary to support the applications identified herein; 2) definition of the MAP message (which include the definition of motorized lane, vehicles, busses, trams, bicycle, pedestrian crosswalks, etc.); and 3) definition of the messages (SRM, SSM) to be exchanged between an intersection traffic controller and approaching vehicles to support priority treatment as might be expected for emergency response , freight transport, and public transport vehicles to improve safety. |
| ITS Application Entity | SAE J2735 | SAE J2735 DSRC Message Set | This standard defines the data and messages for use in DSRC (i.e., V2V, V2I, and V2D) applications. The SAE J2945 series defines additional requirements on how to use these messages. |
| ITS Application Entity | SAE J2945/B | SAE J2945/B Signal Intersection Applications | This document provides guidance on usage of SAE J2735 and other related information for signalized intersection applications. The document focuses on how to use SPaT and MAP messages to support signalized-intersection applications. In general, implementation guidance is necessary to achieve interoperability by addressing the requirements for the options for both over the air dialogs and message contents, and to support larger intersection maps This document also addresses using Signal Request & Signal Status messages corresponding to vehicle functionality and approaches to traffic signal priority/pre-emption (TSP), including three different methods for implementing TSP over the air. The project is complementary to the connected intersections project being performed by ITE. |
Two significant or one significant and several minor issues. For existing deployments, the chosen solution is likely deficient in security or management capabilities and the issues should be reviewed and upgrades developed as needed. For new deployments, the solution may be viable for pilots when applied to the triples it supports; such pilot deployments should consider a path to addressing these issues as a part of their design activities. The solution does not provide sufficient interoperability, management, and security to enable proper, full-scale deployment without additional work.
Last Updated: 2/7/2024
