 |
 |
 |
 |
|
 |
 |
SAE J2735-Draft-Rev15 [issued: 01-30-07]
-
12 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
entities. A data registry may contain abstract data concepts that do not get directly represented as data elements
in any application system, but which help in information interchange and reuse both from the perspective of human
users and for machine-interpretation of data elements. Within the ITS industry, there is a data registry established
and run by the IEEE which contains the contents of this standard. SAE and the ATIS committee have also
developed tools to access and use the data found in the registry as an aid to deployments.
3.15 data structure: Any construct (including data elements, data frames, and other data concepts) used to
represent the contents of a data dictionary.
3.16 data type: A classification of the collection of letters, digits, and/or symbols used to encode values of a data
element based upon the operations that can be performed on the data element. For example, real, integer,
character string, Boolean, bitstring, etc.
3.17 dialog: A sequence of two or more messages which are exchanged in a known sequence and format
(typically of a request followed by one or more replies), which are considered a bound transactional exchange
between the parties.
3.18 encounter: In the context of this standard an encounter is an exchange of messages between two or more
DSRC equipped devices (OBUs or RSUs) lasting for a brief period of time.
3.19 entity: Anything of interest (such as a person, place, process, property, object, concept, association, state,
event, etc.) within a given domain of discourse (in this case within the ITS domain of discourse).
3.20 entity type: An abstract type of structure defined in the ITS data register but no longer used. There are no
entity types defined in this standard.
3.21 EtherType: The Ethernet Type field, as defined in RFC 1042, used to indicate the higher layer protocol above
Logical Link Control.
3.22 functional-area data dictionary (FADD): A data dictionary that is intended to standardize data element
syntax, and semantics, within and among application areas within the same functional area. This DSRC standard
is a FADD.
3.23 initialization: One of three modes, or states, of operation known as Registration, Initialization, and
Operations which DSRC systems operate in. The Initialization mode is used to establish a direct connection (link)
between two DSRC devices. It is comparable to, but not equivalent to, an IEEE 802.11 association.
3.24 intelligent transportation systems (ITS): Systems that apply modern technology to transportation
problems. Another appropriate meaning of the ITS acronym is integrated transportation systems, which stressed
that ITS systems will often integrate components and users from many domains, both public and private.
3.25 interoperability: The ability to share information between heterogeneous applications and systems.
3.26 ITIS: International Traveler Information Systems, the term commonly associated with the standard for incident
phrases developed by the SAE ATIS Committee in conjunction with ITE TMDD and other standards. This work
contains a wide variety of standard phrases to describe incidents and is expected to be used throughout the ITS
industry. The codes found there can be used for sorting and classifying types of incident events, as well as
creating uniform human readable phrases. In the capacity of classifying incident types, ITIS phrases are used in
many areas. ITIS phrases can also be freely mixed with text and used to describe many incidents.
3.27 link: A service channel being used in support of application data transfer needs.
3.28 management plane: The collection of functions performed in support of the communication system
operation, but not directly involved in passing application data.
3.29 message: A well structured set of data elements and data frame that can be sent as a unit between devices
to convey some semantic meaning in the context of the applications about which this standard deals.