REQN

request message PDU, no response message PDU expected

request message PDU, no response message PDU expected

REQRES

request or response message PDU out of the set REQW, REQN, RES

request or response message PDU out of the set REQW, REQN, RES

REQW

request message PDU, response message PDU expected

request message PDU, response message PDU expected

resource block (RB)

7 consecutive symbols in the time domain and 12 consecutive subcarriers in the frequency domain

7 consecutive symbols in the time domain and 12 consecutive subcarriers in the frequency domain

resource pool

set of resources that can be used for PSCCH and PSSCH
NOTE: Resource pool is defined with the help of start RB, number of sub-channels, size of sub-channel, and available subframes.

set of resources that can be used for PSCCH and PSSCH
NOTE: Resource pool is defined with the help of start RB, number of sub-channels, size of sub-channel, and available subframes.

RES

response message PDU, acknowledging a REQW

retention storage

functional and physical means which serve as the repository where all data to be retained are stored, enforcing all required security measures

functional and physical means which serve as the repository where all data to be retained are stored, enforcing all required security measures

SA interface

interface between the ITS-S security entity and ITS-S applications

interface between the ITS-S security entity and ITS-S applications

SfCH

safety channel

SAE

security adaptation entity

security entity; ITS-S security entity

ITS-S part of the ITS station reference architecture that is responsible for providing privacy, communication security and system security

ITS-S part of the ITS station reference architecture that is responsible for providing privacy, communication security and system security

SMIB

security management information base

service access point (SAP)

interface point between data link layer and application layer that has a unique Link Identifier and that allows layers to communicate

interface point between data link layer and application layer that has a unique Link Identifier and that allows layers to communicate

service advertisement message (SAM)

fast message type for service advertisement message

fast message type for service advertisement message

SaCH

service announcement channel; service advertisement channel

SDU

Service Data Unit

service channel (SCH)

is a logical property of a physical wireless communication channel to run application sessions for applications with medium user priority

is a logical property of a physical wireless communication channel to run application sessions for applications with medium user priority

SIP

service initialization phase

SOP

service operation phase

SOA

Service Oriented Architecture

SF interface

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

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

SF-COMMAND

command issued by the ITS-S security entity and sent to the ITS-S facilities layer via the SF-SAP

command issued by the ITS-S security entity and sent to the ITS-S facilities layer via the SF-SAP

SF-REQUEST

command issued by the ITS-S facilities layer and sent to the ITS-S security entity via the SF-SAP

command issued by the ITS-S facilities layer and sent to the ITS-S security entity via the SF-SAP

SI interface

interface between the ITS-S security entity and the ITS-S access layer

interface between the ITS-S security entity and the ITS-S access layer

SI-COMMAND

command issued by the ITS-S security entity and sent to the ITS-S access layer via the SI-SAP

command issued by the ITS-S security entity and sent to the ITS-S access layer via the SI-SAP

SI-REQUEST

command issued by the ITS-S access layer and sent to the ITS-S security entity via the SI-SAP

command issued by the ITS-S access layer and sent to the ITS-S security entity via the SI-SAP

sidelink

radio link between the ITS stations for direct communication

radio link between the ITS stations for direct communication

signal phase and timing (SPaT)

dynamic information related to traffic signal-controlled intersections belonging to a road network.

dynamic information related to traffic signal-controlled intersections belonging to a road network.

signal request message (SRM)

SAE J2735™ message from a C-ITS device to the infrastructure by which the vehicle asks for priority treatment by an intersection’s traffic signal controller

SAE J2735™ message from a C-ITS device to the infrastructure by which the vehicle asks for priority treatment by an intersection’s traffic signal controller

SN interface

interface between the ITS-S security entity and the ITS-S networking & transport layer

interface between the ITS-S security entity and the ITS-S networking & transport layer