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SAE J2735-Draft-Rev29 [issued: 12-11-08]
-
234 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
Importance Level
from USA FCC
Policy
Description (When to apply a
specific urgency level)
Latency for
Reception
(Urgency)
J2735 Message Sets and
Example(s)
Default
Message
Priority
Emergency Impact mitigation and
injury avoidance/mitigation
< 10 ms
Crash-Pending Notification
(Example)
7
Emergency Potential-event impact
and/or injury mitigation and
avoidance
< 10 ms
Pre-Crash (Example)
7
Urgent Warning Events (using
Event Flags)
< 10 ms
Basic Safety + Hard-Brake
(Collision Warning, EEBL, Anti
-Lock, etc.)
7
Urgent warning of impending local
situation
10 to 20 ms
Emergency Vehicle Alert
5
Situation-based status information
of uninvolved local interest
10 to 20 ms
ATIS Roadside Alerts (e.g.
Accident)
5
1 = Safety of Life
Applies to those
Messages and
Message Sets
associated with
societal and/or
safety impact
related to human
life.
Potential-situation information of
uninvolved local interest
> 20 ms
ATIS Probable-situation (e.g.
Rapidly deteriorating
dangerous conditions)
3
Urgent public safety downloads
(Intersection Information)
< 10 ms
SPAT (Signal Phase and
Timing)
6
Public safety data transactions,
exchanges
< 10 ms
Electronic Toll Collection
(Example)
6
Periodic public safety status
information
< 10 ms
Basic Safety
4
Public safety geospatial context
information
10 to 20 ms
GID message (Geospatial
Context)
4
Semi-urgent public safety link
establishment
10 to 20 ms
Lane Coordination;
Cooperative ACC (Example)
4
Public safety RTCM GPS
correction information
10 to 20 ms
RTCM GPSC (GPS
Correction)
4
Semi-urgent public safety data and
application enabler
> 20 ms
Services Table, Digital Map
Download (Example)
3
Important Traffic Management
status information enabler
> 20 ms
ATIS Alerts (e.g. Highway
Closed Ahead)
3
Important Announcement of
Services
> 20 ms
WSA message (Wave Service
Announcement)
3
2 = Public Safety
(Safety not in 1)
Applies to Road
Side Units (RSU)
and On-Board Units
(OBUs) operated by
state or local
governmental
entities
presumptively
engaged in public
safety priority
communications.
(Includes Mobility
and Traffic
Management
Features)
Non-urgent Traffic Management
Foundational Data
> 20 ms
Probe Messages, Localized
warning zones update
3
Urgent, private mobility message
< 10 ms
On-Board Navigation Reroute
Instructions
2
Urgent, private and commercial
electronic transactions
< 10 ms
Electronic Payments
2
Semi-Urgent, private mobility data
and electronic transactions
10 to 20 ms
Commercial applications (e.g.,
GPS driving instructions)
1
Important, private and commercial
electronic transactions
10 to 20 ms
Large commercial transactions
(E-Commerce)
1
3 = Non-Priority
Communications
(Not in 1 or 2)
Applies to Fleet
Management,
Traveler
Information
Services and
Private Systems.
Background, private mobility data
downloads and upgrades
> 20 ms
Area map or database
download or upgrade
1