ITS Roadway Equipment --> Multi-Access Edge Computing:
signal priority status

Definition
Included In
Communication Solutions
Characteristics
Security

Definitions

signal priority status (Information Flow): In response to a request for signal priority, this flow indicates the status of the priority or preemption request.

ITS Roadway Equipment (Source Physical Object): 'ITS Roadway Equipment' represents the ITS equipment that is distributed on and along the roadway that monitors and controls traffic and monitors and manages the roadway. This physical object includes traffic detectors, environmental sensors, traffic signals, highway advisory radios, dynamic message signs, CCTV cameras and video image processing systems, grade crossing warning systems, and ramp metering systems. Lane management systems and barrier systems that control access to transportation infrastructure such as roadways, bridges and tunnels are also included. This object also provides environmental monitoring including sensors that measure road conditions, surface weather, and vehicle emissions. Work zone systems including work zone surveillance, traffic control, driver warning, and work crew safety systems are also included.

Multi-Access Edge Computing (Destination Physical Object): 'Multi-Access Edge Computing' ((MEC) previously known as mobile edge computing) represents computing devices that operate and are managed like a cloud server, but are deployed at the edge of a network (typically a cellular network, but it could be any network). While not in strict proximity to the transportation network, these systems do benefit from vastly decreased distances to the roadway compared to central systems, and so can provide lower latency than strictly backoffice systems

Included In

This Triple is in the following Service Packages:

None

This triple is associated with the following Functional Objects:

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

None

This Triple has the following triple relationships:

None

Communication Solutions

EU: Signal Control Messages - Secure Wireless Internet (EU) (16)

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

Selected Solution

EU: Signal Control Messages - Secure Wireless Internet (EU)

Solution Description

This solution is used within Australia and the E.U.. It combines standards associated with EU: Signal Control Messages with those for I-M: Secure Wireless Internet (EU). The EU: Signal Control Messages standards include upper-layer standards required to implement signal control information flows. The I-M: Secure Wireless Internet (EU) standards include lower-layer standards that support secure communications between two entities, either or both of which may be mobile devices, but they must be stationary or only moving within wireless range of a single wireless access point (e.g., a parked car). Security is based on X.509 certificates. A non-mobile (if any) endpoint may connect to the service provider using any Internet connection method.

ITS Application Entity SAE J2735 ISO 19091 ETSI 102 894-2			Click gap icons for more info.
Mgmt Bundle: SNMPv3 MIB	Facilities ETSI 103 301	Security Secure Session Alternatives
	TransNet IP Alternatives Internet Transport Alternatives
	Access Wireless Internet Alternatives (EU)

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	Now
Spatial Context	Local
Acknowledgement	False
Cardinality	Unicast
Initiator	Source
Authenticable	True
Encrypt	False

Interoperability	Description
Local	In cases where an interface is normally encapsulated by a single stakeholder, interoperability is still desirable, but the motive is vendor independence and the efficiencies and choices that an open standards-based interface provides.

Security

Information Flow Security
	Confidentiality	Integrity	Availability
Rating	Moderate	Moderate	Low
Basis	Not much could be learned by observing this flow, just the state of the priority request and the identity of the requester. Both of those are information that can be gleaned by physical observation, and give little advantage to an observer; ; however, all communications between field infrastructure should be protected from viewing to prevent attackers from analyzing traffic and developing attack methods.	Signal priority status information enables the receiving vehicle to proceed with more surety toward's its next stop; while there are obvious redundancies, a degree of confidence in the state of the message is required for user acceptance if nothing else.	The most important aspect of this flow is the initiating request and hopefull success of that priority message; if that succeeds then the signal will turn in the vehicle's favor, making this flow a 'nice-to-have' that should be correct if it arrives, but is not necessary for the priority application to function.

Security Characteristics	Value
Authenticable	True
Encrypt	False

ITS Roadway Equipment --> Multi-Access Edge Computing:signal priority status