Emergency Vehicle OBE --> Connected Vehicle Roadside Equipment:
local signal preemption request

Definitions

local signal preemption request (Information Flow): Direct control signal or message to a signalized intersection that results in preemption of the current control plan and grants right-of-way to the requesting vehicle.

Emergency Vehicle OBE (Source Physical Object): The Emergency Vehicle On-Board Equipment (OBE) resides in an emergency vehicle and provides the processing, storage, and communications functions that support public safety-related connected vehicle applications. It represents a range of vehicles including those operated by police, fire, and emergency medical services. In addition, it represents other incident response vehicles including towing and recovery vehicles and freeway service patrols. It includes two-way communications to support coordinated response to emergencies. A separate 'Vehicle OBE' physical object supports the general vehicle safety and driver information capabilities that apply to all vehicles, including emergency vehicles. The Emergency Vehicle OBE supplements these general capabilities with capabilities that are specific to emergency vehicles.

Connected Vehicle Roadside Equipment (Destination Physical Object): 'Connected Vehicle Roadside Equipment' (CV RSE) represents the Connected Vehicle roadside devices that are used to send messages to, and receive messages from, nearby vehicles using Dedicated Short Range Communications (DSRC) or other alternative wireless communications technologies. Communications with adjacent field equipment and back office centers that monitor and control the RSE are also supported. This device operates from a fixed position and may be permanently deployed or a portable device that is located temporarily in the vicinity of a traffic incident, road construction, or a special event. It includes a processor, data storage, and communications capabilities that support secure communications with passing vehicles, other field equipment, and centers.

Included In

This Triple is in the following Service Packages:

This Triple is described by the following Functional View Functional Objects:

This Triple is described by the following Functional View Data Flows:

This Triple has the following triple relationships:

RelationshipSourceDestinationFlow
Interactive Connected Vehicle Roadside Equipment Emergency Vehicle OBE signal priority status

Communication Solutions

Solutions are sorted in ascending Gap Severity order. The Gap Severity is the parenthetical number at the end of the solution.

Selected Solution

US: SAE Signal Preemption - WAVE TCP

Solution Description

This solution is used within the U.S.. It combines standards associated with US: SAE Signal Preemption with those for V-X: WAVE TCP. The US: SAE Signal Preemption standards include upper-layer standards required to implement signal preemption and priority information flows. The V-X: WAVE TCP standards include lower-layer standards that support connection-oriented vehicle-to-any communications within ~300m using the Transmission Control Protocol (TCP) over Internet Protocol version 6 (IPv6) over IEEE WAVE in the 5.9GHz spectrum.

ITS Application Entity
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SAE J2735
CEN ISO 19091
SAE J2945/B
CTI 4501
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Addressed Elsewhere
Facilities
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SAE J2945
Security
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TransNet

IEEE 1609.3
Bundle: IPv6 for WAVE
IETF RFC 9293
Access
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Note that some layers might have alternatives, in which case all of the gap icons associated with every alternative may be shown on the diagram, but the solution severity calculations (and resulting ordering of solutions) includes only the issues associated with the default (i.e., best, least severe) alternative.

Characteristics

Characteristic Value
Time Context Recent
Spatial Context Adjacent
Acknowledgement False
Cardinality Unicast
Initiator Source
Authenticable True
Encrypt False


Interoperability Description
National This triple should be implemented consistently within the geopolitical region through which movement is essentially free (e.g., the United States, the European Union).

Security

Information Flow Security
  Confidentiality Integrity Availability
Rating Not Applicable High Moderate
Basis It does not matter if someone is able to eavesdrop on this request. There will be many other more obvious indicators that the request was made, such as sirens and flashing lights on the emergency vehicle. The system must be able to trust these requests. Emergency Vehicles should be able to send these requests and know that they are being operated on by the receiving system. Additionally, if an unauthorized vehicle is able to send these requests it could bring traffic to a standstill by disrupting signal coordination citywide. The alternative to this request is existing mechanisms – such as using the sirens to stop traffic. The difference between the emergency signal preemption application and existing practice is not significant enough to justify a HIGH availability requirement.


Security Characteristics Value
Authenticable True
Encrypt False