V2X Flashcards

1
Q

SPaT

A

Signal, Phase, and Timing

Information about traffic signals: What phase an intersection is on, and how much time remains.

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2
Q

MAP

A

A MAP message defines the intersection geography (literally a map), and is used in conjunction with a SPaT message to understand the state of the intersection

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3
Q

BSM

A

Basic Safety Message

A message sent out usually at a 10Hz rate (10x a second) by a vehicle’s OBU on its given position and status.

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4
Q

RSU

A

Roadside Unit
Broadcasts and receives V2X radio messages at an intersection, and communicates with the traffic controller and other services via Ethernet

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5
Q

OBU

A

Onboard Unit
V2X device on a vehicle that communicates with RSUs and other OBUs. Typically sends BSMs, and listens for SPaT+MAP (and other BSMs).

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6
Q

DSRC

A

Dedicated Short Range Communication
Wireless standard for sending V2X messages over radio. Has been largely replaced with CV2X although we still offer DSRC at Mcity.

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7
Q

CV2X

A

Wireless standard for sending V2X messages over radio. This replaced DSRC and utilizes cellular technology

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8
Q

J2735

A

SAE standard message set for V2X. This contains the definitions for “SPaT”, “MAP”, etc. (used by both DSRC and CV2X)

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9
Q

IFM / IMF

A

Immediate Forward Message / Immediate Message Forward (interchangeable)
The function on an RSU to broadcast messages received via Ethernet across its radio link (usually the receiving port is UDP 1516)

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10
Q

SRM

A

The function on an RSU to periodically broadcast messages that are stored locally on the device, such as MAP messages once per second. (As opposed to IMF)

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