DNI

distinct null identifier

DCC

distributed congestion control

DSRC profiles

consistent and standardised set of cross layer parameters in a specific DSRC implementation identified by a unique number

consistent and standardised set of cross layer parameters in a specific DSRC implementation identified by a unique number

encryption

process of encoding messages (or information) in such a way that only authorized parties can read it

process of encoding messages (or information) in such a way that only authorized parties can read it

event based probe data element

an event based probe data element is an item of data included in an event based probe message, typically describing the event that has triggered the transmission of the message

an event based probe data element is an item of data included in an event based probe message, typically describing the event that has triggered the transmission of the message

event based probe message

event based probe data includes event based probe data elements and event based probe messages
NOTE 1 to entry: An algorithm in the vehicle constantly processes sensor readings and determines if a specific event has occurred. An event based probe data message is sent only when a specific incident or event occurs. It is not transmitted in a periodic manner. The transmission of an event based…

event based probe data includes event based probe data elements and event based probe messages
NOTE 1 to entry: An algorithm in the vehicle constantly processes sensor readings and determines if a specific event has occurred. An event based probe data message is sent only when a specific incident or event occurs. It is not transmitted in a periodic manner. The transmission of an event based probe message itself indicates that an event has occurred An event based probe message is defined as a probe message that is not triggered by a periodic occurring condition (i.e. time or distance). It is typically triggered after a defined event has occurred or an event has been detected by the vehicle on board system (i.e. low visibility or traffic jam entry). An event may be defined as simple as a change in status of a standard probe data element (i.e. fog light switching state) or can refer to a complex incident detected by a detection algorithm (i.e. traffic jam entry).

EUI

extended universal identifier

FA interface

interface between the facilities layer and the ITS-S applications entity

interface between the facilities layer and the ITS-S applications entity

facilities layer; ITS-S facilities layer

ITS-S protocol layer in the ITS station reference architecture containing the OSI session, presentation and application layer protocols
NOTE 1 to entry: Within the US, the NTCIP standards call the facilities layer the “application layer”. However, as this term is easily confused with both the OSI application layer and the application entity, the term should be avoided and qualified when used …

ITS-S protocol layer in the ITS station reference architecture containing the OSI session, presentation and application layer protocols
NOTE 1 to entry: Within the US, the NTCIP standards call the facilities layer the “application layer”. However, as this term is easily confused with both the OSI application layer and the application entity, the term should be avoided and qualified when used (e.g. OSI application layer).

FNTP

fast networking & transport protocol

FAST service

a service offered by a FAST service provider via a wireless communication interface to a FAST service user, which may provide as a minimum, but not limited to this, a single information message, where the service is implemented in a provider application and in a client application

a service offered by a FAST service provider via a wireless communication interface to a FAST service user, which may provide as a minimum, but not limited to this, a single information message, where the service is implemented in a provider application and in a client application

FSA

fast service advertisement

FAST service provider

an entity providing a service to a client entity where the service provider entity acts as a communications master, initiating and controlling the service session

an entity providing a service to a client entity where the service provider entity acts as a communications master, initiating and controlling the service session

FAST service user

an entity consuming a service offered by a service provider entity where the service provider entity acts as a communications master, initiating and controlling the service session

an entity consuming a service offered by a service provider entity where the service provider entity acts as a communications master, initiating and controlling the service session

fixed equipment (FE)

fixed communication facility with one or more downlink channels and, optionally, one or more uplink channels
NOTE: Normally the fixed equipment is installed at a fixed location, but it may be installed on a mobile platform.

fixed communication facility with one or more downlink channels and, optionally, one or more uplink channels
NOTE: Normally the fixed equipment is installed at a fixed location, but it may be installed on a mobile platform.

fixed wireless broadband system

wireless broadband system including communication between user terminals and wireless access points in which the locations of the user terminals and the wireless access points are stationary (i.e. consistent with “fixed wireless access” as defined in Recommendation ITU-R F.1399)

wireless broadband system including communication between user terminals and wireless access points in which the locations of the user terminals and the wireless access points are stationary (i.e. consistent with “fixed wireless access” as defined in Recommendation ITU-R F.1399)

fragmentation

function performed by the transfer kernel to map one ASDU on multiple LSDUs
NOTE1 In ISO/IEC 7498-1, fragmentation is called segmentation.
NOTE2 The inverse function is called defragmentation or, in ISO/IEC 7498-1, disassembling.

function performed by the transfer kernel to map one ASDU on multiple LSDUs
NOTE1 In ISO/IEC 7498-1, fragmentation is called segmentation.
NOTE2 The inverse function is called defragmentation or, in ISO/IEC 7498-1, disassembling.

FSAP

FSA protocol

FMT-ID

FSAP Message Type Identifier

Geo-anycast

geo-anycast provides data dissemination from a source node to all nodes within a specified target area
NOTE: The first station in the target area receiving the data shall forward the received data in a next hop. All other stations in the target area must not further forward the received data.

geo-anycast provides data dissemination from a source node to all nodes within a specified target area
NOTE: The first station in the target area receiving the data shall forward the received data in a next hop. All other stations in the target area must not further forward the received data.

Geo-broadcast

geo-broadcast provides data dissemination from a source node to all nodes within a specified target area. Stations inside this target area may forward further the received data.

geo-broadcast provides data dissemination from a source node to all nodes within a specified target area. Stations inside this target area may forward further the received data.

Geo-networking

geo-routing network layer protocol using addresses in the form of geo-coordinates which identify target areas of possible destination stations

geo-routing network layer protocol using addresses in the form of geo-coordinates which identify target areas of possible destination stations

Geo-unicast

geo-unicast provides unidirectional data transport from a source node to a destination node by means of multiple subsequent hops
NOTE: An identifier of the destination node shall be used, which preferably is globally unique. This station identifier shall be mapped to the actual geo-location of the destination. As the destination may be moving, this relation shall be updated frequently.

geo-unicast provides unidirectional data transport from a source node to a destination node by means of multiple subsequent hops
NOTE: An identifier of the destination node shall be used, which preferably is globally unique. This station identifier shall be mapped to the actual geo-location of the destination. As the destination may be moving, this relation shall be updated frequently.

ITS-SCUID

globally unique identifier of an ITS-SCU

handover

process of switching a communications transaction in progress from one communication cell to another or between radio channels in the same cell
NOTE: Handover is used to allow established sessions to continue when mobile stations move from one cell/AP to another and as a method for minimizing co-channel interference.

process of switching a communications transaction in progress from one communication cell to another or between radio channels in the same cell
NOTE: Handover is used to allow established sessions to continue when mobile stations move from one cell/AP to another and as a method for minimizing co-channel interference.

head of the line

queuing discipline (also referred to as strict or fixed priority queuing), where a number of queues are served in priority order; a lower priority queue is served if all higher priority queues are empty, each queue is served in First-Come-First-Serve order, each user goes head of the line of the users of lower priorities but behind all users of equal or higher priority

queuing discipline (also referred to as strict or fixed priority queuing), where a number of queues are served in priority order; a lower priority queue is served if all higher priority queues are empty, each queue is served in First-Come-First-Serve order, each user goes head of the line of the users of lower priorities but behind all users of equal or higher priority

heterogeneous handover

process by which a communication link is switched from one virtual communication interface to another one of a different medium type

process by which a communication link is switched from one virtual communication interface to another one of a different medium type

homogeneous handover

process by which a communication link is switched from one virtual communication interface to another one of the same medium type

process by which a communication link is switched from one virtual communication interface to another one of the same medium type

hybrid communication support

feature of an ITS station used to combine multiple access technologies and protocols

feature of an ITS station used to combine multiple access technologies and protocols

hybrid communications

composition of multiple access technologies and communication protocols combined to provide complementary or redundant communication channels

composition of multiple access technologies and communication protocols combined to provide complementary or redundant communication channels