Abbreviations

Results for area 12.3 Telecommunications

term
air interface
definition

conductor-free medium between an OBE and the reader/interrogator through which the linking of the OBE to the reader/interrogator is achieved by means of electro-magnetic signals

term
read/write cycle
definition

complete sequence of interaction by the reader/interrogator where the OBE is unambiguously identified and new data, comprising either whole or part of the full data set, is written onto the OBE by means of the air interface

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term
electronic data interchange (EDI)
definition

passing of a data message, or series of messages, between computers and/or between different software systems

NOTE Within this context an EDI message is normally compatible with the form specified in ISO 9897. EDI is an instance of an EDT transaction.

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term
electronic data transfer (EDT)
definition

the passing of data sets comprising an entire message from one computer to another or from one software system to another

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term
read/write (device/OBE)
definition

a data mode corresponding to an OBE in which data content can be changed by means of a compatible interrogator via the air interface

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term
monologue
definition

one way communication between the fixed equipment and OBE(s)

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term
bi-directional dialogue
definition

two way communications between fixed equipment and OBE(s)

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term
bi-directional monologue
definition

“read only” functionality with a start signal from the FE side

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term
registration procedure
definition

procedure for registration as defined in ISO/TS 24534-3

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term
CEN DSRC profile
definition

a set of parameters constituting a certain international standardized profile of the DSRC protocol stack (L1, L2 and L7)

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term
radio frequency identification (RFID)
definition

common term describing an automatic identification system comprising one or more reader/interrogator(s) and one or more OBE(s) in which communication and data transfer is achieved by wireless means of electromagnetic signals

NOTE It varies from low frequency (inductive) to microwave frequencies.

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term
ERI session
definition

an instance of a ’Vehicle Identification’ using a harmonised air interface protocol known as ‘CEN DSRC profile’, using a distinct set of ‘AVI/AEI attributes’, retrieved by ‘service primitives (communication)’ and ‘security mechanisms’

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term
communication control
definition

fixed equipment function to control the communication between fixed equipment and OBE

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term
ERI transaction
definition

transaction as defined in ISO 24534-4

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term
shadowing
definition

condition where the close proximity of a vehicle/equipment interposed between FE and OBE obscures the signals, thus preventing a successful AVI/AEI transaction

NOTE The shadowing caused by normal traffic behaviour is taken into account and overcome to provide a successful transaction. Abnormal shadowing may be caused by large or unusually shaped vehicles/equipment or by vehicles travelling too closely together.

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term
(AVI/AEI) transaction
definition

completed cycle of communication (across the air interface at reference point delta) wherein a message identifying a vehicle or item of equipment is successfully received and understood by the receiver during one passage through the read zone

NOTE The number of attempts, retries and repeats is not relevant, it is only that one fully completed identification process communication cycle is successfully completed to the extent that no communications error could be detected.

term
dedicated short range communication (DSRC)
definition

means of effecting local (short range) transactions between fixed equipment and OBE(s) using an “air interface” comprising inductive or propagated signals between the fixed equipment and OBE(s); technology for the transmission of information between multiple vehicles50) (V2V) and between vehicles and the transportation infrastructure (V2I and I2V) using wireless technologies

NOTE 1 to entry It is characterized as having a limited distance (approximately 300 m) but is assumed to be low latency to establish a connection and exchange information.

term
reference point
definition

data flow between two function blocks, where protocols define the information flow across the reference point

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