Link Type: Position Location Interface

Location and Time Data Source --> Personal Information Device:
location and time

Definitions

location and time (Information Flow): The current geographic location in three dimensions (latitude, longitude, elevation) and the current time.

Location and Time Data Source (Source Physical Object): The 'Location and Time Data Source' provides accurate position information. While a Global Positioning System (GPS) Receiver is the most common implementation, this physical object represents any technology that provides a position fix in three dimensions and time with sufficient accuracy.

Personal Information Device (Destination Physical Object): The 'Personal Information Device' provides the capability for travelers to receive formatted traveler information wherever they are. Capabilities include traveler information, trip planning, and route guidance. Frequently a smart phone, the Personal Information Device provides travelers with the capability to receive route planning and other personally focused transportation services from the infrastructure in the field, at home, at work, or while en-route. Personal Information Devices may operate independently or may be linked with vehicle on-board equipment. This subsystem also supports safety related services with the capability to broadcast safety messages and initiate a distress signal or request for help.

Included In

This Triple is in the following Service Packages:

This Triple is in the following Functional Objects:

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

This Triple has the following triple relationships:

None

Communication Solutions

  • GNSS Data - GNSS serial interface (6)
Solutions are sorted in ascending Gap Severity order. The Gap Severity is the parenthetical number at the end of the solution.

Selected Solution

GNSS Data - GNSS serial interface

Solution Description

This solution is used within Australia, the E.U. and the U.S.. It combines standards associated with GNSS Data with those for GNSS serial interface. The GNSS Data standards include upper-layer standards required to obtain location and time information from a satellite-positioning-system-based geolocation receiver. The GNSS serial interface standards include lower-layer standards that support communications between connected ITS equipment and geolocation equipment such as a GPS receiver.

ITS Application Entity

NMEA 0183
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Mgmt

No Standard Needed
Facilities

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Security
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TransNet

NMEA 0183
Access
Mind the gap

NMEA 0183
TransNet TransNet

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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 Now
Spatial Context Adjacent
Acknowledgement False
Cardinality Broadcast
Initiator Source
Authenticable True
Encrypt True


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 High High
Basis While time reference should be universally available, time reference coupled with personal location is tracking data. This flow is internal to a PID, but should probably be encrypted to discourage hacking. Thus MODERATE. Location and time data is the basis for safety and a host of other applications. Corruption of this flow could lead directly to a vehicle accident. If this information is not available, applications depending on this information will not function properly.


Security Characteristics Value
Authenticable True
Encrypt True