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SU07: ITS Communications

This service package provides secure, reliable communications between ITS devices. It provides the layered protocols and communications services and includes the physical network plant and network hardware that supports ITS communications. It also encompasses security services that protect communications and preserve privacy, and the management services that support network management.

Relevant Regions: Australia, Canada, European Union, and United States

Enterprise

Development Stage Roles and Relationships

Installation Stage Roles and Relationships

Operations Stage Roles and Relationships
(hide)

Source Destination Role/Relationship
ITS Communications Equipment Manager ITS Communications Equipment Manages
ITS Communications Equipment Owner ITS Communications Equipment Owns
ITS Communications Equipment Owner ITS Communications Equipment Manager Operations Agreement
ITS Communications Equipment Supplier ITS Communications Equipment Owner Warranty
ITS Object Manager ITS Object Manages
ITS Object Owner ITS Communications Equipment Owner Expectation of Information Provision
ITS Object Owner ITS Object Owns
ITS Object Owner ITS Object Manager Operations Agreement
ITS Object Owner Wide Area Information Disseminator System Owner Expectation of Information Provision
ITS Object Supplier ITS Object Owner Warranty
Other ITS Objects Manager Other ITS Objects Manages
Other ITS Objects Owner ITS Communications Equipment Owner Expectation of Information Provision
Other ITS Objects Owner Other ITS Objects Owns
Other ITS Objects Owner Other ITS Objects Manager Operations Agreement
Other ITS Objects Supplier Other ITS Objects Owner Warranty
Roadside Communications Unit Manager Roadside Communications Unit Manages
Roadside Communications Unit Owner Roadside Communications Unit Owns
Roadside Communications Unit Owner Roadside Communications Unit Manager Operations Agreement
Roadside Communications Unit Supplier Roadside Communications Unit Owner Warranty
Wide Area Information Disseminator System Manager Wide Area Information Disseminator System Manages
Wide Area Information Disseminator System Owner Wide Area Information Disseminator System Owns
Wide Area Information Disseminator System Owner Wide Area Information Disseminator System Manager Operations Agreement
Wide Area Information Disseminator System Supplier Wide Area Information Disseminator System Owner Warranty

Maintenance Stage Roles and Relationships

Physical

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Includes Physical Objects:

Physical Object Class Description
ITS Communications Equipment Support 'ITS Communications Equipment' includes the communications hardware and software that supports secure, reliable communications. It provides the layered protocols and communications services and includes the physical network plant and network hardware that supports ITS communications. It also encompasses security services that protect communications and the management services that support network management. This physical object allows transportation stakeholders that are implementing their own communications solution to represent this implementation in their ITS architecture. The communications capabilities provided by this physical object are frequently purchased from a third party provider. When communications is a purchased service, the hardware and software included in this physical object are largely transparent to transportation stakeholders and may be transparent to the ITS architecture.
ITS Object ITS The general 'ITS Object' includes core capabilities common to any class of object.
Other ITS Objects ITS Representing other ITS Objects, 'Other ITS Objects' provides a source and destination for information exchange between ITS Objects.
Roadside Communications Unit Field The 'Roadside Communications Unit' provides wireless communications between roadside infrastructure and nearby equipped vehicles. Communications with adjacent field equipment (including other RCUs) and back office centers that monitor and control the RCU are also supported. It provides basic radio communications supporting the lower layers of the OSI stack (TransNet and SubNet layers of the ARC-IT communications model). See also 'Connected Vehicle Roadside Equipment' that extends the basic RCU radio communications functionality with a full communications stack and support for locally installed ITS Applications
Wide Area Information Disseminator System Support The 'Wide Area Information Disseminator System' represents the center based systems and communications equipment that is used to send messages to equipped vehicles using wide-area wireless communications such as satellite radio, terrestrial FM broadcast subcarrier, or cellular data networks.

Includes Functional Objects:

Functional Object Description Physical Object
ITS Communications Privacy Protection 'ITS Communications Privacy Protection' operates as a proxy, obscuring the originator's network address, and tagging the message so that it can return replies to the originator. ITS Communications Equipment
ITS Communications Services 'ITS Communications Services' supports secure, reliable data communications between connected devices. It includes the network devices as well as any required physical cabling and supporting hardware that represent the communications infrastructure that originate, route, and terminate data communications between a source and a destination. Applications specific protocols are layered over more general communications protocols to support the communications. Network management keeps the network configured and working reliably. Security services ensure the data received is correct and from an authentic source. ITS Communications Equipment
ITS Communications Support 'ITS Communications Support' provides means to send and receive messages to and from other ITS Objects. It provides mechanisms for scheduling and prioritizing communications traffic. It may also provide relay functions. ITS Object
ITS Security Support 'ITS Security Support' provides communications and system security functions to the ITS Object, including privacy protection functions. It may include firewall, intrusion management, authentication, authorization, profile management, identity management, cryptographic key management. It may include a hardware security module and security management information base. ITS Object
RCU Radio Communications 'RCU Radio Communications' provides basic radio communications between roadside infrastructure and nearby equipped vehicles and mobile devices. Communications with adjacent field equipment (including other RCUs) and back office centers that monitor and control the RCU are also supported. It supports the lower layers of the OSI stack, specifically the TransNet and SubNet layers of the ARC-IT communications model. Message relay capabilities are also included to improve radio communications range, reliability, and performance. Roadside Communications Unit
WAID Broadcast Services 'WAID Broadcast Services' provides wide-area digital broadcast of traveler information to transportation users across a region. It collects traveler information of interest to clientele (either subscribers or the general public) and distributes the traveler information using broadcast data services that are offered in context with entertainment and other data services. Wide Area Information Disseminator System

Includes Information Flows:

Information Flow Description
ITS information Information exchanged by ITS systems or devices. This flow is a super-flow; it does not define specific content since it represents any information flow exchange between physical objects defined in ARC-IT. This information flow represents any of those information flows and inherits the data content and attributes defined in the more detailed information flows.
local ITS information ITS information that is relevant to a particular location (e.g., a particular intersection) that is of interest to receivers near that location. This flow is a super-flow; it does not define specific content since it represents any information flow exchange using short range communications between physical objects defined in ARC-IT. This includes both broadcast communications to all receivers within range and unicast communications targeted for a specific receiver. This information flow represents any of those information flows and inherits the data content and attributes defined in the more detailed information flows.
local ITS information relay Local ITS information that is relayed to improve range, reliability, and/or performance. This flow is a super-flow; it does not define specific content since it represents any relay of 'local ITS information' using short range communications. See 'local ITS information' for more information.
proxied ITS information Information exchanged by ITS systems or devices where the sender is isolated from the receiver by an intermediary that acts as a proxy for the sender. This flow is a super-flow; it does not define specific content since it represents any information flow exchange between physical objects defined in ARC-IT. This information flow represents any of those information flows and inherits the data content and attributes defined in the more detailed information flows.
wide area broadcast ITS information ITS information of broad interest that is relevant over a wide area and suitable for broadcast distribution. This flow is a super-flow; it does not define specific content since it represents all wide-area broadcast information flows defined in ARC-IT. This information flow represents any of those broadcast information flows and inherits the data content and attributes defined in the more detailed information flows.

Goals and Objectives

Associated Planning Factors and Goals

Planning Factor Goal
B. Increase the safety of the transportation system for motorized and nonmotorized users; Achieve a significant reduction in traffic fatalities and serious injuries on all public roads
C. Increase the security of the transportation system for motorized and nonmotorized users; Improve the security of the transportation system

Associated Objective Categories

Objective Category
Safety: Vehicle Crashes and Fatalities
Security: Crime
Security: Terrorism, Natural Disasters, and Hazardous Material Incidents

Associated Objectives and Performance Measures

Objective Performance Measure
Enhance tracking and monitoring of sensitive Hazmat shipments Number of Hazmat shipments tracked in real-time
Reduce exposure due to Hazmat & homeland security incidents Homeland security incident response time
Reduce exposure due to Hazmat & homeland security incidents Number of Hazmat incidents
Reduce exposure due to Hazmat & homeland security incidents Number of homeland security incidents
Reduce security risks to motorists and travelers Number of critical sites with security surveillance
Reduce security risks to motorists and travelers Number of security incidents on roadways
Reduce security risks to transit passengers and transit vehicle operators Number of security incidents at transit facilities
Reduce security risks to transit passengers and transit vehicle operators Number of security incidents on transit vehicles
Reduce security risks to transit passengers and transit vehicle operators Number of transit facilities and vehicles under security surveillance
Reduce security risks to transportation infrastructure Number of critical sites with hardened security enhancements
Reduce security risks to transportation infrastructure Number of critical sites with security surveillance
Reduce security risks to transportation infrastructure Number of security incidents on transportation infrastructure
Reduce the total number of crashes in the region by X percent by year Y. Total crashes per X VMT.


 
Since the mapping between objectives and service packages is not always straight-forward and often situation-dependent, these mappings should only be used as a starting point. Users should do their own analysis to identify the best service packages for their region.

Needs and Requirements

Need Functional Object Requirement
01 System operators, vehicle operators, support system operators, PID users need to be able communicate with other users without divulging their identity, location or other Personally Identifiable Information (PII). ITS Communications Privacy Protection 01 The ITS Communications Equipment shall accept messages to be proxied from one ITS Object to another ITS Object.
02 The ITS Communications Equipment shall forward proxied messages to their destination ITS Object.
03 The ITS Communications Equipment shall maintain the source network address of a proxied message.
04 The ITS Communications Equipment shall use the source network address to return responses for proxied messages.
ITS Communications Support 01 The ITS Object shall include a mechanism for scheduling message transmission distinct from the message's originating Functional Object.
02 The ITS Object shall include a mechanism for prioritizing message transmission based on input from originating Functional Object.
03 The ITS Object shall include a mechanism for relaying messages received using one physical communications medium to other ITS Objects using that same medium.
04 The ITS Object shall include a mechanism for relaying messages received using one physical communications medium to other ITS Objects using a different medium.
ITS Security Support 04 The ITS Object shall provide a mechanism for on-board applications to digitally sign messages using keys secured by the CCMS' trust authority.
05 The ITS Object shall provide a mechanism for on-board applications to authenticate messages secured by the CCMS' trust authority.
06 The ITS Object shall provide a mechanism for on-board applications to encrypt messages using keys secured by the CCMS' trust authority.
07 The ITS Object shall provide a mechanism for on-board applications to decrypt messages using keys secured by the CCMS' trust authority.
RCU Radio Communications 01 The field device shall provide radio communications between roadside infrastructure and nearby equipped vehicles.
02 System users need their messages to be communicated to their intended recipients. ITS Communications Services 01 The center shall send messages to destinations specified in the message.
WAID Broadcast Services 01 The support system shall provide wide-area digital broadcast of traveler information to transportation users across a region.

Related Sources

Document Name Version Publication Date
ITS User Services Document 1/1/2005
Security Credential Management System Design Draft 4/13/2012
Vehicle-to-Vehicle Communications: Readiness of V2V Technology for Application 8/1/2014


Security

In order to participate in this service package, each physical object should meet or exceed the following security levels.

Physical Object Security
Physical Object Confidentiality Integrity Availability Security Class
ITS Communications Equipment High High High Class 5
ITS Object High High High Class 5
Other ITS Objects High High High Class 5
Roadside Communications Unit High High High Class 5
Wide Area Information Disseminator System High High High Class 5



In order to participate in this service package, each information flow triple should meet or exceed the following security levels.

Information Flow Security
Source Destination Information Flow Confidentiality Integrity Availability
Basis Basis Basis
ITS Communications Equipment ITS Object ITS information High High High
This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE or LOW confidentiality requirement, then this could be MODERATE or LOW, as appropriate. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE.
ITS Communications Equipment ITS Object proxied ITS information High High High
This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE or LOW confidentiality requirement, then this could be MODERATE or LOW, as appropriate. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE.
ITS Communications Equipment Other ITS Objects ITS information High High High
This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE or LOW confidentiality requirement, then this could be MODERATE or LOW, as appropriate. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE.
ITS Communications Equipment Other ITS Objects proxied ITS information High High High
This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE or LOW confidentiality requirement, then this could be MODERATE or LOW, as appropriate. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE.
ITS Object ITS Communications Equipment ITS information High High High
This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE or LOW confidentiality requirement, then this could be MODERATE or LOW, as appropriate. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE.
ITS Object Other ITS Objects ITS information High High High
This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE or LOW confidentiality requirement, then this could be MODERATE or LOW, as appropriate. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE.
ITS Object Roadside Communications Unit ITS information High High High
This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE or LOW confidentiality requirement, then this could be MODERATE or LOW, as appropriate. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE.
ITS Object Wide Area Information Disseminator System ITS information High High High
This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE or LOW confidentiality requirement, then this could be MODERATE or LOW, as appropriate. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE.
Other ITS Objects ITS Communications Equipment ITS information High High High
This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE or LOW confidentiality requirement, then this could be MODERATE or LOW, as appropriate. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE.
Other ITS Objects ITS Object ITS information High High High
This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE or LOW confidentiality requirement, then this could be MODERATE or LOW, as appropriate. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE.
Other ITS Objects Roadside Communications Unit local ITS information High High High
This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE or LOW confidentiality requirement, then this could be MODERATE or LOW, as appropriate. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE.
Roadside Communications Unit ITS Object ITS information High High High
This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE or LOW confidentiality requirement, then this could be MODERATE or LOW, as appropriate. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE.
Roadside Communications Unit Other ITS Objects local ITS information High High High
This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE or LOW confidentiality requirement, then this could be MODERATE or LOW, as appropriate. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE.
Roadside Communications Unit Other ITS Objects local ITS information relay High High High
This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE or LOW confidentiality requirement, then this could be MODERATE or LOW, as appropriate. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE. This value is derived from the specific flows satisfied by this super-flow. HIGH is set because some flows may require it. If the implementation includes flows with only a MODERATE integrity requirement, then this could be MODERATE.
Wide Area Information Disseminator System Other ITS Objects wide area broadcast ITS information Not Applicable Moderate Low
By definition this is publicly broadcast data. The distribution of this data is intended to be very large, as such the impact of corrupted data will be significant. Probably not HIGH, as there are other distribution channels for this data. There are multiple channels for the delivery of this information, so if this one is not available, others will work. Could consider raising this to MODERATE if it is the sole mechanism able to reach certain areas.

Standards

The following table lists the standards associated with physical objects in this service package. For standards related to interfaces, see the specific information flow triple pages.

Name Title Physical Object
FIPS 140-2 Security Requirements for Cryptographic Modules ITS Object
ISO 21217 Architecture Intelligent transport systems -- Communications access for land mobiles (CALM) -- Architecture ITS Object
USDOT RSU Dedicated Short-Range Communications Roadside Unit Specifications (FHWA-JPO-17-589) Roadside Communications Unit